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list | update_date
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sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0708.0749 | Erik Sjoqvist | Marie Ericsson, David Kult, Erik Sj\"oqvist, and Johan Aberg | Nodal free geometric phases: Concept and application to geometric
quantum computation | Small typo corrected, journal reference added | Phys. Lett. A 372, 596 (2008) | 10.1016/j.physleta.2007.08.022 | null | quant-ph | null | Nodal free geometric phases are the eigenvalues of the final member of a
parallel transporting family of unitary operators. These phases are gauge
invariant, always well-defined, and can be measured interferometrically. Nodal
free geometric phases can be used to construct various types of quantum phase
gates.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 11:53:02 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Jan 2008 08:46:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ericsson",
"Marie",
""
],
[
"Kult",
"David",
""
],
[
"Sjöqvist",
"Erik",
""
],
[
"Aberg",
"Johan",
""
]
] |
0708.0750 | Seth A. Major | Seth Major | On the q-quantum gravity loop algebra | v2: text clarified, version to be published | Class.Quant.Grav.25:065003,2008 | 10.1088/0264-9381/25/6/065003 | null | gr-qc | null | A class of deformations of the q-quantum gravity loop algebra is shown to be
incompatible with the combinatorics of Temperley-Lieb recoupling theory with
deformation parameter at a root of unity. This incompatibility appears to
extend to more general deformation parameters.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:54:32 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 21:34:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Major",
"Seth",
""
]
] |
0708.0751 | Paul M. O'Neill | Paul M. O'Neill (1 and 2), Kirpal Nandra (1), Massimo Cappi (3), Anna
Lia Longinotti (4), Stuart A. Sim (5) ((1) Imperial College London, (2)
Charles Sturt University, Wagga Wagga (3) INAF-IASF Bologna, (4) European
Space Astronomy Centre of ESA, Madrid (5) Max-Planck-Institut fur
Astrophysik, Garching) | On the relativistic iron line and soft excess in the Seyfert 1 galaxy
Markarian 335 | 6 pages, 2 figures, accepted for publication in MNRAS | null | 10.1111/j.1745-3933.2007.00376.x | null | astro-ph | null | We report on a 133 ks XMM-Newton observation of the Seyfert 1 galaxy
Markarian 335. The 0.4-12 keV spectrum contains an underlying power law
continuum, a soft excess below 2 keV, and a double-peaked iron emission feature
in the 6-7 keV range. We investigate the possibility that the double-peaked
emission might represent the characteristic signature of the accretion disc.
Detailed investigations show that a moderately broad, accretion disc line is
most likely present, but that the peaks may be owing to narrower components
from more distant material. The peaks at 6.4 and 7 keV can be identified,
respectively, with the molecular torus in active galactic nucleus unification
schemes, and very highly ionized, optically thin gas filling the torus. The
X-ray variability spectra on both long (~100 ks) and short (~1 ks) timescales
disfavour the recent suggestion that the soft excess is an artifact of
variable, moderately ionized absorption.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 12:10:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"O'Neill",
"Paul M.",
"",
"1 and 2"
],
[
"Nandra",
"Kirpal",
""
],
[
"Cappi",
"Massimo",
""
],
[
"Longinotti",
"Anna Lia",
""
],
[
"Sim",
"Stuart A.",
""
]
] |
0708.0752 | Masaaki Kitagawa | Masaaki Kitagawa, Katsunari Enomoto, Kentaro Kasa, Yoshiro Takahashi,
Roman Ciurylo, Pascal Naidon, and Paul S. Julienne | Two-color photoassociation spectroscopy of ytterbium atoms and the
precise determinations of s-wave scattering lengths | 9 pages, 7 figures | null | 10.1103/PhysRevA.77.012719 | null | physics.atom-ph | null | By performing high-resolution two-color photoassociation spectroscopy, we
have successfully determined the binding energies of several of the last bound
states of the homonuclear dimers of six different isotopes of ytterbium. These
spectroscopic data are in excellent agreement with theoretical calculations
based on a simple model potential, which very precisely predicts the s-wave
scattering lengths of all 28 pairs of the seven stable isotopes. The s-wave
scattering lengths for collision of two atoms of the same isotopic species are
13.33(18) nm for ^{168}Yb, 3.38(11) nm for ^{170}Yb, -0.15(19) nm for ^{171}Yb,
-31.7(3.4) nm for ^{172}Yb, 10.55(11) nm for ^{173}Yb, 5.55(8) nm for ^{174}Yb,
and -1.28(23) nm for ^{176}Yb. The coefficient of the lead term of the
long-range van der Waals potential of the Yb_2 molecule is C_6=1932(30) atomic
units $(E_h a_0^6 \approx 9.573\times 10^{-26}$ J nm^6).
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 12:36:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kitagawa",
"Masaaki",
""
],
[
"Enomoto",
"Katsunari",
""
],
[
"Kasa",
"Kentaro",
""
],
[
"Takahashi",
"Yoshiro",
""
],
[
"Ciurylo",
"Roman",
""
],
[
"Naidon",
"Pascal",
""
],
[
"Julienne",
"Paul S.",
""
]
] |
0708.0753 | Paolo Salucci | P. Salucci, A. M. Swinbank, A. Lapi, I. Yegorova, R. G. Bower, Ian
Smail, G. P. Smith | The Baryonic and Dark Matter Properties of High Redshift Gravitationally
Lensed Disk Galaxies | 6 Pages, 3 figures, Submitted to MNRAS | null | 10.1111/j.1365-2966.2007.12390.x | null | astro-ph | null | We present a detailed study of the structural properties of four
gravitationally lensed disk galaxies at z=1. Modelling the rotation curves on
sub-kpc scales we derive the values for the disk mass, the reference dark
matter density and core radius, and the angular momentum per unit mass. The
derived models suggest that the rotation curve profile and amplitude are best
fit with a dark matter component similar to those of local spiral galaxies. The
stellar component also has a similar length scale, but with substantially
smaller masses than similarly luminous disk galaxies in the local universe.
Comparing the average dark matter density inside the optical radius we find
that the disk galaxies at z=1 have larger densities (by up to a factor of 7)
than similar disk galaxies in the local Universe. Furthermore, the angular
momentum per unit mass versus reference velocity is well matched to the local
relation, suggesting that the angular momentum of the disk remains constant
between high redshifts and the present day. Though statistically limited, these
observations point towards a spirals' formation scenario in which stellar disks
are slowly grown by the accretion of angular momentum conserving material.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 12:46:50 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Salucci",
"P.",
""
],
[
"Swinbank",
"A. M.",
""
],
[
"Lapi",
"A.",
""
],
[
"Yegorova",
"I.",
""
],
[
"Bower",
"R. G.",
""
],
[
"Smail",
"Ian",
""
],
[
"Smith",
"G. P.",
""
]
] |
0708.0754 | Poirier Mario | Mario Poirier, Francis Laliberte, Loreynne Pinsard, Alexandre
Revcolevschi | Magneto-elastic coupling in hexagonal YMnO_3 | null | null | null | null | cond-mat.str-el | null | We report an ultrasonic investigation of the elastic moduli on a single
crystal of hexagonal YMnO_3 as a function of temperature. Stiffening anomalies
in the antiferromagnetic N\'eel state below T_N = 72.4 K are observed on all
the four elastic moduli C_{ii}. The anomalies are the most important on C_{11}
and C_{66} for in-plane elastic deformations; this is consistent with a strong
coupling of the lattice with the in-plane exchange interactions. We use a
Landau free energy model to account for these elastic anomalies. We derive an
expression which relates the temperature profile of the anomaly to the order
parameter; the critical exponent associated to this parameter $\beta$ = 0.42 is
not consistent with a chiral XY or 3D Heisenberg universality class, but more
in agreement with a conventional antiferromagnetic long range order. A tiny
softening anomaly on C_{11} for which hysteresis effects are observed could be
indicative of an interaction between ferroelectric and magnetic domains at T_N.
Moreover, magnetic fluctuations effects both above and below T_N are identified
through abnormal temperature and magnetic field effects.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 12:29:51 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Poirier",
"Mario",
""
],
[
"Laliberte",
"Francis",
""
],
[
"Pinsard",
"Loreynne",
""
],
[
"Revcolevschi",
"Alexandre",
""
]
] |
0708.0755 | Shamgar Gurevich | Shamgar Gurevich (UC Berkeley) and Ronny Hadani (University of
Chicago) | Notes on the Self-Reducibility of the Weil Representation and
Higher-Dimensional Quantum Chaos | Notes from the lectures delivered at AGAQ conference (Istanbul, June
2006) | null | null | null | math-ph math.MP math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these notes we discuss the "self-reducibility property" of the Weil
representation. We explain how to use this property to obtain sharp estimates
of certain higher-dimensional exponential sums which originate from the theory
of quantum chaos. As a result, we obtain the Hecke quantum unique ergodicity
theorem for generic linear symplectomorphism $A$ of the torus
$T^{2N}=R^{2N}/Z^{2N}.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 12:36:12 GMT"
},
{
"version": "v2",
"created": "Sat, 12 Jul 2008 11:54:38 GMT"
},
{
"version": "v3",
"created": "Fri, 24 Apr 2009 08:30:50 GMT"
}
] | 2009-04-24T00:00:00 | [
[
"Gurevich",
"Shamgar",
"",
"UC Berkeley"
],
[
"Hadani",
"Ronny",
"",
"University of\n Chicago"
]
] |
0708.0756 | Laurent Veron | Andrey Shishkov, Laurent Veron | Singular solutions of some nonlinear parabolic equations with spatially
inhomogeneous absorption | 29 pages | null | null | null | math.AP math.CA | null | We study the limit behaviour of solutions of a class of solutions of
nonlinear parabolic equations with a degenerate strong absorption. We prove
that two types of phenomena can occur: the pointwise singularity or the
formation of razor blades (or persistent singularities).
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 12:36:17 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Aug 2007 13:34:55 GMT"
}
] | 2007-08-23T00:00:00 | [
[
"Shishkov",
"Andrey",
""
],
[
"Veron",
"Laurent",
""
]
] |
0708.0757 | Laurent Veron | Marie-Francoise Bidaut-Veron, Mustapha Jazar, Laurent Veron | Separable solutions of some quasilinear equations with source reaction | 34 pages | null | null | null | math.AP math.DS | null | We study the existence of singular separable solutions to a class of
quasilinear equations with reaction term. In the 2-dim case, we use a dynamical
system approach to construct our solutions.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 12:42:26 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Bidaut-Veron",
"Marie-Francoise",
""
],
[
"Jazar",
"Mustapha",
""
],
[
"Veron",
"Laurent",
""
]
] |
0708.0758 | Will Dison | Will Dison | A Subgroup of a Direct Product of Free Groups whose Dehn Function has a
Cubic Lower Bound | 9 pages, 1 figure. Minor modifications only: typos corrected, scope
of Theorem 5.1 reduced to simplify notation, bibliography updated | null | null | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish a cubic lower bound on the Dehn function of a certain finitely
presented subgroup of a direct product of 3 free groups.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 12:54:25 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Jan 2009 13:53:33 GMT"
}
] | 2009-01-07T00:00:00 | [
[
"Dison",
"Will",
""
]
] |
0708.0759 | Thomas Konstandin | Andres Hernandez, Thomas Konstandin, Michael G. Schmidt | Effective Action in a General Chiral Model: Next to Leading Order
Derivative Expansion in the Worldline Method | 33 pages, minor changes, published version | Nucl.Phys.B793:425-450,2008 | 10.1016/j.nuclphysb.2007.10.005 | null | hep-th hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a formalism to determine the imaginary part of a general chiral
model in the derivative expansion. Our formalism is based on the worldline path
integral for the covariant current that can be given in an explicit chiral and
gauge covariant form. The effective action is then obtained by integrating the
covariant current, taking account of the anomaly.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:12:15 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Oct 2008 10:26:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hernandez",
"Andres",
""
],
[
"Konstandin",
"Thomas",
""
],
[
"Schmidt",
"Michael G.",
""
]
] |
0708.0760 | Juan P. Garrahan | Lester O. Hedges, Lutz Maibaum, David Chandler, Juan P. Garrahan | De-coupling of Exchange and Persistence Times in Atomistic Models of
Glass Formers | 4 pages, 2 figures | J. Chem. Phys. 127, 211101 (2007) | 10.1063/1.2803062 | null | cond-mat.stat-mech cond-mat.soft | null | With molecular dynamics simulations of a fluid mixture of classical particles
interacting with pair-wise additive Weeks-Chandler-Andersen potentials, we
consider the time series of particle displacements and thereby determine
distributions for local persistence times and local exchange times. These basic
characterizations of glassy dynamics are studied over a range of super-cooled
conditions and shown to have behaviors, most notably de-coupling, similar to
those found in kinetically constrained lattice models of structural glasses.
Implications are noted.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:57:28 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Dec 2007 18:02:11 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Hedges",
"Lester O.",
""
],
[
"Maibaum",
"Lutz",
""
],
[
"Chandler",
"David",
""
],
[
"Garrahan",
"Juan P.",
""
]
] |
0708.0761 | Jean-Marc Luck | D. Boose, J.M. Luck | Statistics of quantum transmission in one dimension with broad disorder | 26 pages, 4 figures, 1 table | J. Phys. A 40 (2007) 14045-14067 | 10.1088/1751-8113/40/47/002 | null | cond-mat.stat-mech cond-mat.mes-hall | null | We study the statistics of quantum transmission through a one-dimensional
disordered system modelled by a sequence of independent scattering units. Each
unit is characterized by its length and by its action, which is proportional to
the logarithm of the transmission probability through this unit. Unit actions
and lengths are independent random variables, with a common distribution that
is either narrow or broad. This investigation is motivated by results on
disordered systems with non-stationary random potentials whose fluctuations
grow with distance.
In the statistical ensemble at fixed total sample length four phases can be
distinguished, according to the values of the indices characterizing the
distribution of the unit actions and lengths. The sample action, which is
proportional to the logarithm of the conductance across the sample, is found to
obey a fluctuating scaling law, and therefore to be non-self-averaging, in
three of the four phases. According to the values of the two above mentioned
indices, the sample action may typically grow less rapidly than linearly with
the sample length (underlocalization), more rapidly than linearly
(superlocalization), or linearly but with non-trivial sample-to-sample
fluctuations (fluctuating localization).
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:19:53 GMT"
}
] | 2007-11-06T00:00:00 | [
[
"Boose",
"D.",
""
],
[
"Luck",
"J. M.",
""
]
] |
0708.0762 | Erik Zackrisson | E. Zackrisson, N. Bergvall, C. Flynn, G. Ostlin, G. Micheva, B.
Caldwell | Red Halos of Galaxies - Reservoirs of Baryonic Dark Matter? | 9 pages, proceedings of IAU Symposium 244, Dark Galaxies & Lost
Baryons | null | 10.1017/S1743921307013798 | null | astro-ph | null | Deep optical/near-IR surface photometry of galaxies outside the Local Group
have revealed faint and very red halos around objects as diverse as disk
galaxies and starbursting dwarf galaxies. The colours of these structures are
too extreme to be reconciled with stellar populations similar to those seen in
the stellar halos of the Milky Way or M31, and alternative explanations like
dust reddening, high metallicities or nebular emission are also disfavoured. A
stellar population obeying an extremely bottom-heavy initial mass function
(IMF), is on the other hand consistent with all available data. Because of its
high mass-to-light ratio, such a population would effectively behave as
baryonic dark matter and could account for some of the baryons still missing in
the low-redshift Universe. Here, we give an overview of current red halo
detections, alternative explanations for the origin of the red colours and
ongoing searches for red halos around types of galaxies for which this
phenomenon has not yet been reported. A number of potential tests of the
bottom-heavy IMF hypothesis are also discussed.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:40:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zackrisson",
"E.",
""
],
[
"Bergvall",
"N.",
""
],
[
"Flynn",
"C.",
""
],
[
"Ostlin",
"G.",
""
],
[
"Micheva",
"G.",
""
],
[
"Caldwell",
"B.",
""
]
] |
0708.0763 | Alireza Haghpayma | Alireza Haghpayma | Diquark approach to calculating the mass and stability of multiquark
states | 4 pages,6 figures | null | null | null | hep-ph | null | By using of vector diquark ideas in the chiral limit diquark correlations in
the relativistic region and imposing HF interactions between quarks in a vector
diquark we calculated the mass of two multiquark states (Theta pentaquark and H
dibaryon), also by using of tunneling method we simultaneously calculated their
decay width
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 06:43:32 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Haghpayma",
"Alireza",
""
]
] |
0708.0764 | Andreas Walther | L. Rippe, B. Julsgaard, A. Walther, Yan Ying, S. Kr\"oll | Experimental quantum state tomography of a solid state qubit | 5 pages, 3 figures (eps) | null | 10.1103/PhysRevA.77.022307 | null | quant-ph | null | Full quantum state tomography is used to characterize the state of an
ensemble based qubit implemented through two hyperfine levels in Pr3+ ions,
doped into a Y2SiO5 crystal. We experimentally verify that single-qubit
rotation errors due to inhomogeneities of the ensemble can be suppressed using
the Roos-Moelmer dark state scheme. Fidelities above >90%, presumably limited
by excited state decoherence, were achieved. Although not explicitly taken care
of in the Roos-Moelmer scheme, it appears that also decoherence due to
inhomogeneous broadening on the hyperfine transition is largely suppressed.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:32:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rippe",
"L.",
""
],
[
"Julsgaard",
"B.",
""
],
[
"Walther",
"A.",
""
],
[
"Ying",
"Yan",
""
],
[
"Kröll",
"S.",
""
]
] |
0708.0765 | Alexandros Alexakis | A. Alexakis, B. Bigot, H. Politano | Anisotropic fluxes and nonlocal interactions in MHD turbulence | Submitted to PRE | null | 10.1103/PhysRevE.76.056313 | null | physics.flu-dyn physics.plasm-ph | null | We investigate the locality or nonlocality of the energy transfer and of the
spectral interactions involved in the cascade for decaying magnetohydrodynamic
(MHD) flows in the presence of a uniform magnetic field $\bf B$ at various
intensities. The results are based on a detailed analysis of three-dimensional
numerical flows at moderate Reynold numbers. The energy transfer functions, as
well as the global and partial fluxes, are examined by means of different
geometrical wavenumber shells. On the one hand, the transfer functions of the
two conserved Els\"asser energies $E^+$ and $E^-$ are found local in both the
directions parallel ($k_\|$-direction) and perpendicular ($k_\perp$-direction)
to the magnetic guide-field, whatever the ${\bf B}$-strength. On the other
hand, from the flux analysis, the interactions between the two
counterpropagating Els\"asser waves become nonlocal. Indeed, as the ${\bf
B}$-intensity is increased, local interactions are strongly decreased and the
interactions with small $k_\|$ modes dominate the cascade. Most of the energy
flux in the $k_\perp$-direction is due to modes in the plane at $k_\|=0$, while
the weaker cascade in the $k_\|$-direction is due to the modes with $k_\|=1$.
The stronger magnetized flows tends thus to get closer to the weak turbulence
limit where the three-wave resonant interactions are dominating. Hence, the
transition from the strong to the weak turbulence regime occurs by reducing the
number of effective modes in the energy cascade.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:32:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alexakis",
"A.",
""
],
[
"Bigot",
"B.",
""
],
[
"Politano",
"H.",
""
]
] |
0708.0766 | Amos Nevo | Amos Nevo and Robert J. Zimmer | Invariant rigid geometric structures and smooth projective factors | The existence of a smooth projective factor is now established for
actions of groups of arbitrary real rank, provided that the fundamental group
is amenable. Geometric and Functional Analysis, to appear | null | null | null | math.DS math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider actions of non-compact simple Lie groups preserving an analytic
rigid geometric structure of algebraic type on a compact manifold. The
structure is not assumed to be unimodular, so an invariant measure may not
exist. Ergodic stationary measures always exist, and when such a measure has
full support, we show the following.
1) Either the manifold admits a smooth equivariant map onto a homogeneous
projective variety, defined on an open dense conull invariant set, or the Lie
algebra of the Zariski closure of the Gromov representation of the fundamental
group contains a Lie subalgebra isomorphic to the Lie algebra of the acting
group. As a corollary, a smooth non-trivial homogeneous projective factor does
exist whenever the fundamental group of $M$ admits only virtually solvable
linear representations, and thus in particular when $M$ is simply connected,
regardless of the real rank.
2) There exist explicit examples showing that analytic rigid actions of
certain simple groups (of real rank one) may indeed fail to have a smooth
projective factor.
3) It is possible to generalize Gromov's theorem on the algebraic hull of the
representation of the fundamental group of the manifold to the case of analytic
rigid non-unimodular structures, for actions of simple groups of any real rank.
An important ingredient in the proofs is a generalization of Gromov's
centralizer theorem beyond the case of invariant measures.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:36:40 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Jan 2009 13:10:23 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Nevo",
"Amos",
""
],
[
"Zimmer",
"Robert J.",
""
]
] |
0708.0767 | Viktor Soshnikov | V. N. Soshnikov | Collisionsless amplifying of longitudinal electron waves in two-stream
plasma | 6 pages, 2 tables,PDF | "The Integrated Scientific Journal", n. 4, p. 61, 2006 (in
Russian) | null | null | physics.plasm-ph | null | To better understanding the principal features of collisionless
damping/growing plasma waves we have implemented a demonstrative calculation
for the simplest cases of electron waves in two-stream plasmas with the
delta-function type electron velocity distribution function of each of the
streams with velocities v(1) and v(2). The traditional dispersion equation is
reduced to an algebraic 4th order equation, for which numerical solutions are
presented for a variant of equal stream densities. In the case of uniform
half-infinite slab one finds two dominant type solutions: non-damping forward
waves and forward complex conjugated exponentially both damping and growing
waves. Beside it in this case there is no necessity of calculation any
logarithmically divergent indefinite integrals. The possibility of wave
amplifying might be useful in practical applications.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:50:01 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Soshnikov",
"V. N.",
""
]
] |
0708.0768 | Blair Edwards | B. Edwards, H. M. Araujo, V. Chepel, D. Cline, T. Durkin, J. Gao, C.
Ghag, E. V. Korolkova, V. N. Lebedenko, A. Lindote, M. I. Lopes, R. Luscher,
A. St. J. Murphy, F. Neves, W. Ooi, J. Pinto da Cunha, R. M. Preece, G.
Salinas, C. Silva, V. N. Solovov, N. J. T. Smith, P. F. Smith, T. J. Sumner,
C. Thorne, R. J. Walker, H. Wang, J. T. White and F. L. H. Wolfs | Measurement of single electron emission in two-phase xenon | 11 pages, 6 figures | Astropart.Phys.30:54-57,2008 | 10.1016/j.astropartphys.2008.06.006 | null | physics.ins-det | null | We present the first measurements of the electroluminescence response to the
emission of single electrons in a two-phase noble gas detector. Single
ionization electrons generated in liquid xenon are detected in a thin gas layer
during the 31-day background run of the ZEPLIN-II experiment, a two-phase xenon
detector for WIMP dark matter searches. Both the pressure dependence and
magnitude of the single-electron response are in agreement with previous
measurements of electroluminescence yield in xenon. We discuss different
photoionization processes as possible cause for the sample of single electrons
studied in this work. This observation may have implications for the design and
operation of future large-scale two-phase systems.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 16:06:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Edwards",
"B.",
""
],
[
"Araujo",
"H. M.",
""
],
[
"Chepel",
"V.",
""
],
[
"Cline",
"D.",
""
],
[
"Durkin",
"T.",
""
],
[
"Gao",
"J.",
""
],
[
"Ghag",
"C.",
""
],
[
"Korolkova",
"E. V.",
""
],
[
"Lebedenko",
"V. N.",
""
],
[
"Lindote",
"A.",
""
],
[
"Lopes",
"M. I.",
""
],
[
"Luscher",
"R.",
""
],
[
"Murphy",
"A. St. J.",
""
],
[
"Neves",
"F.",
""
],
[
"Ooi",
"W.",
""
],
[
"da Cunha",
"J. Pinto",
""
],
[
"Preece",
"R. M.",
""
],
[
"Salinas",
"G.",
""
],
[
"Silva",
"C.",
""
],
[
"Solovov",
"V. N.",
""
],
[
"Smith",
"N. J. T.",
""
],
[
"Smith",
"P. F.",
""
],
[
"Sumner",
"T. J.",
""
],
[
"Thorne",
"C.",
""
],
[
"Walker",
"R. J.",
""
],
[
"Wang",
"H.",
""
],
[
"White",
"J. T.",
""
],
[
"Wolfs",
"F. L. H.",
""
]
] |
0708.0769 | Rodolfo Sassot | Daniel de Florian, Rodolfo Sassot (Buenos Aires U.), Marco Stratmann
(Wako, Riken) | Fragmentation functions for pions, kaons, protons and charged hadrons | 3 pages, 7 figures. Talk given at EPS HEP 2007 | J.Phys.Conf.Ser.110:022045,2008 | 10.1088/1742-6596/110/2/022045 | null | hep-ph nucl-th | null | We present new sets of pion, kaon, proton and inclusive charged hadron
fragmentation functions obtained in NLO combined analyses of single-inclusive
hadron production in electron-positron annihilation, proton-proton collisions,
and deep-inelastic lepton-proton scattering with either particles identified in
the final state. At variance with all previous fits, the present analyses take
into account data where hadrons of different electrical charge are identified,
which allow to discriminate quark from anti-quark fragmentation functions.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:42:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"de Florian",
"Daniel",
"",
"Buenos Aires U."
],
[
"Sassot",
"Rodolfo",
"",
"Buenos Aires U."
],
[
"Stratmann",
"Marco",
"",
"Wako, Riken"
]
] |
0708.0770 | Archan S. Majumdar | Biplab Ghosh, A. S. Majumdar, N. Nayak | Control of atomic entanglement by dynamic Stark effect | 7 pages, Revtex, 6 eps figures | null | null | null | quant-ph | null | We study the entanglement properties of two three-level Rydberg atoms passing
through a single-mode cavity. The interaction of an atom with the cavity field
allows the atom to make a transition from the upper most (lower most) to the
lower most (upper most) level by emission (absoprtion) of two photons via the
middle level. We employ an effective Hamiltonian that describes the system with
a Stark shifted two-photon atomic transition. We compute the entanglement of
formation of the joint two-atom state as a function of Rabi angle $gt$. It is
shown that the Stark shift can be used to enhance the magnitude of atomic
entanglement over that obtained in the resonant condition for certain parameter
values. We find that though the two-atom entanglement generally diminishes with
the increase of the two-photon detuning and the Stark shift, it is possible to
sustain the entanglement over a range of interaction times by making the
detuning and the Stark shift compensate each other. Similar characteristics are
obtained for a thermal state cavity field too.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:45:55 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Ghosh",
"Biplab",
""
],
[
"Majumdar",
"A. S.",
""
],
[
"Nayak",
"N.",
""
]
] |
0708.0771 | Alessia Gualandris | Alessia Gualandris and David Merritt | Ejection of Supermassive Black Holes from Galaxy Cores | 18 pages, The Astrophysical Journal, in press. Replaced with revised
version | null | 10.1086/586877 | null | astro-ph | null | [Abridged] Recent numerical relativity simulations have shown that the
emission of gravitational waves during the merger of two supermassive black
holes (SMBHs) delivers a kick to the final hole, with a magnitude as large as
4000 km/s. We study the motion of SMBHs ejected from galaxy cores by such kicks
and the effects on the stellar distribution using high-accuracy direct N-body
simulations. Following the kick, the motion of the SMBH exhibits three distinct
phases. (1) The SMBH oscillates with decreasing amplitude, losing energy via
dynamical friction each time it passes through the core. Chandrasekhar's theory
accurately reproduces the motion of the SMBH in this regime if 2 < ln Lambda <
3 and if the changing core density is taken into account. (2) When the
amplitude of the motion has fallen to roughly the core radius, the SMBH and
core begin to exhibit oscillations about their common center of mass. These
oscillations decay with a time constant that is at least 10 times longer than
would be predicted by naive application of the dynamical friction formula. (3)
Eventually, the SMBH reaches thermal equilibrium with the stars. We estimate
the time for the SMBH's oscillations to damp to the Brownian level in real
galaxies and infer times as long as 1 Gyr in the brightest galaxies. Ejection
of SMBHs also results in a lowered density of stars near the galaxy center;
mass deficits as large as five times the SMBH mass are produced for kick
velocities near the escape velocity. We compare the N-body density profiles
with luminosity profiles of early-type galaxies in Virgo and show that even the
largest observed cores can be reproduced by the kicks, without the need to
postulate hypermassive binary SMBHs. Implications for displaced AGNs and
helical radio structures are discussed.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:46:28 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 21:11:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gualandris",
"Alessia",
""
],
[
"Merritt",
"David",
""
]
] |
0708.0772 | Markus Sondermann | M. Sondermann, R. Maiwald, H. Konermann, N. Lindlein, U. Peschel, G.
Leuchs | Design of a mode converter for efficient light-atom coupling in free
space | RevTex4, 3 figures, revised version, accepted for publication at
Appl. Phys. B | Appl. Phys. B, vol. 89, 489-492 (2007) | 10.1007/s00340-007-2859-4 | null | quant-ph | null | In this article, we describe how to develop a mode converter that transforms
a plane electromagnetic wave into an inward moving dipole wave. The latter one
is intended to bring a single atom or ion from its ground state to its excited
state by absorption of a single photon wave packet with near-100% efficiency.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 13:57:50 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Oct 2007 09:20:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sondermann",
"M.",
""
],
[
"Maiwald",
"R.",
""
],
[
"Konermann",
"H.",
""
],
[
"Lindlein",
"N.",
""
],
[
"Peschel",
"U.",
""
],
[
"Leuchs",
"G.",
""
]
] |
0708.0773 | Henk Polinder | H. Polinder | S=-1,-2 baryon-baryon interactions in chiral effective field theory | 3 pages, 2 PostScript figures, talk to appear in the proceedings of
the "International Nuclear Physics Conference (INPC2007), Tokyo, Japan, 3-8
June 2007" | null | null | FZJ-IKP-TH-2007-24 | nucl-th | null | We have constructed the leading order strangeness S=-1,-2 baryon-baryon
potential in a chiral effective field theory approach. The chiral potential
consists of one-pseudoscalar-meson exchanges and non-derivative four-baryon
contact terms. The potential, derived using SU(3) symmetry constraints,
contains six independent low-energy coefficients. We have solved a regularized
Lippmann-Schwinger equation and achieved a good description of the available
scattering data. Furthermore a correctly bound hypertriton has been obtained.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:20:50 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Polinder",
"H.",
""
]
] |
0708.0774 | Declan Mulhall | Declan Mulhall, Zachary Huard, and Vladimir Zelevinsky | Ergodicity of the $\Delta_3$ statistic and purity of neutron resonance
data | 24 pages, 19 figures, 1 table | Phys.Rev.C76:064611,2007 | 10.1103/PhysRevC.76.064611 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\Delta_3(L)$ statistic characterizes the fluctuations of the number of
levels as a function of the length of the spectral interval. It is studied as a
possible tool to indicate the regular or chaotic nature of underlying dynamics,
detect missing levels and the mixing of sequences of levels of different
symmetry, particularly in neutron resonance data. The relation between the
ensemble average and the average over different fragments of a given
realization of spectra is considered. A useful expression for the variance of
$\Delta_3(L)$ which accounts for finite sample size is discussed. An analysis
of neutron resonance data presents the results consistent with a maximum
likelihood method applied to the level spacing distribution.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 15:45:25 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Aug 2008 03:14:39 GMT"
},
{
"version": "v3",
"created": "Sat, 7 May 2011 13:47:14 GMT"
}
] | 2011-05-10T00:00:00 | [
[
"Mulhall",
"Declan",
""
],
[
"Huard",
"Zachary",
""
],
[
"Zelevinsky",
"Vladimir",
""
]
] |
0708.0775 | Neelima Kelkar Dr | N. G. Kelkar, M. Nowakowski | Breit type equation for mesonic atoms | 11 pages Latex | Phys.Lett.B651:363-368,2007 | 10.1016/j.physletb.2007.06.051 | null | nucl-th hep-ph nucl-ex | null | The finite size effects and relativistic corrections in pionic and kaonic
hydrogen are evaluated by generalizing the Breit equation for a spin-0 -
spin-1/2 amplitude with the inclusion of the hadron electromagnetic form
factors. The agreement of the relativistic corrections to the energies of the
mesonic atoms with other methods used to evaluate them is not exact, but
reasonably good. The precision values of the energy shifts due to the strong
interaction, extracted from data, are however subject to the hadronic form
factor uncertainties.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:23:05 GMT"
}
] | 2010-11-04T00:00:00 | [
[
"Kelkar",
"N. G.",
""
],
[
"Nowakowski",
"M.",
""
]
] |
0708.0776 | Federico Vazquez | F. Vazquez, J.C. Gonzalez-Avella, V.M. Eguiluz, M. San Miguel | Time scale competition leading to fragmentation and recombination
transitions in the coevolution of network and states | 5 pages, 5 figures, figures 2 and 4 changed, tile changed, to be
published in PRE | Phys. Rev. E 76, 046120 (2007) | 10.1103/PhysRevE.76.046120 | null | physics.soc-ph physics.data-an | null | We study the co-evolution of network structure and node states in a model of
multiple state interacting agents. The system displays two transitions, network
recombination and fragmentation, governed by time scales that emerge from the
dynamics. The recombination transition separates a frozen configuration,
composed by disconnected network components whose agents share the same state,
from an active configuration, with a fraction of links that are continuously
being rewired. The nature of this transition is explained analytically as the
maximum of a characteristic time. The fragmentation transition, that appears
between two absorbing frozen phases, is an anomalous order-disorder transition,
governed by a crossover between the time scales that control the structure and
state dynamics.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:25:00 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Oct 2007 16:44:00 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Vazquez",
"F.",
""
],
[
"Gonzalez-Avella",
"J. C.",
""
],
[
"Eguiluz",
"V. M.",
""
],
[
"Miguel",
"M. San",
""
]
] |
0708.0777 | Thiago P. Mayer Alegre | Thiago P. Mayer Alegre, Antonio C. Torrezan de Souza, Gilberto
Medeiros-Ribeiro | Microstrip resonator for microwaves with controllable polarization | 3 pages, 3 figures, submitted to Appl. Phys. Lett | Appl. Phys. Lett. 91, 204103 (2007) | 10.1063/1.2809372 | null | cond-mat.other | null | In this work the authors implemented a resonator based upon microstrip
cavities that permits the generation of microwaves with arbitrary polarization.
Design, simulation, and implementation of the resonators were performed using
standard printed circuit boards. The electric field distribution was mapped
using a scanning probe cavity perturbation technique. Electron spin resonance
using a standard marker was carried out in order to verify the polarization
control from linear to circular.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:25:21 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Oct 2007 21:05:13 GMT"
}
] | 2010-12-20T00:00:00 | [
[
"Alegre",
"Thiago P. Mayer",
""
],
[
"de Souza",
"Antonio C. Torrezan",
""
],
[
"Medeiros-Ribeiro",
"Gilberto",
""
]
] |
0708.0778 | Alexei Yu. Karlovich | Alexei Yu. Karlovich | Singular integral operators on variable Lebesgue spaces with radial
oscillating weights | 24 pages. Theorem 1.1 is stated as a necessary and sufficient
condition. The necessity portion is new, its proof is added | null | null | null | math.FA math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a Fredholm criterion for operators in the Banach algebra of singular
integral operators with matrix piecewise continuous coefficients acting on a
variable Lebesgue space with a radial oscillating weight over a logarithmic
Carleson curve. The local spectra of these operators are massive and have a
shape of spiralic horns depending on the value of the variable exponent, the
spirality indices of the curve, and the Matuszewska-Orlicz indices of the
weight at each point. These results extend (partially) the results of A.
B\"ottcher, Yu. Karlovich, and V. Rabinovich for standard Lebesgue spaces to
the case of variable Lebesgue spaces.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:27:02 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Apr 2008 09:43:24 GMT"
},
{
"version": "v3",
"created": "Tue, 3 Mar 2009 17:59:40 GMT"
}
] | 2009-03-03T00:00:00 | [
[
"Karlovich",
"Alexei Yu.",
""
]
] |
0708.0779 | Jurgen Berges | J. Berges, D. Sexty | Real-time gauge theory simulations from stochastic quantization with
optimized updating | 29 pages, 9 figures, 2 tables (NPB version, minor changes) | Nucl.Phys.B799:306-329,2008 | 10.1016/j.nuclphysb.2008.01.018 | null | hep-lat hep-ph hep-th nucl-th | null | We investigate simulations for gauge theories on a Minkowskian space-time
lattice. We employ stochastic quantization with optimized updating using
stochastic reweighting or gauge fixing, respectively. These procedures do not
affect the underlying theory but strongly improve the stability properties of
the stochastic dynamics, such that simulations on larger real-time lattices can
be performed.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:34:58 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 23:18:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Berges",
"J.",
""
],
[
"Sexty",
"D.",
""
]
] |
0708.0780 | Phil Williams | Phillip Y. Williams | A weight function theory of zero order basis function interpolants and
smoothers | VERS 1: 81pg, 3fig. Portable latex from Scientific Word 5.00 Build
2606. VERS 2: replaced vers 1 with consolidation of all the zero order docs,
as per moderator's instructs. 196pg, 16fig. VERS 3: 419p, 19fig, 3 extra
chapters. VER 4: 656p extension of version 3 | null | null | null | math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I develop a weight func theory of zero order basis func interpolants and
smoothers.**Ch1 Basis funcs and data spaces are defined using wt funcs. Data
(native)spaces are used to formulate the variational problems which define our
interpolants /smoothers. Introduce the tensor prod extended B-splines.**Ch2
Prove the p'twise convergence of the minimal norm basis func interpol to its
data func and obtain orders of converg. Data func spaces for the B-splines are
locally Sobolev spaces.**Ch3 Another set of error estims for basis func
interpol. Use distrib'n Taylor expansion of exp(i(a,x)).**Ch4 Derive local
interpol errors for data funcs with bounded first derivs.**Ch5 Introduce class
of tensor prod wt funcs which I call the central diff wt funcs - related to the
B-splines. Apply theory to these wt funcs to obtain interpol converge results.
The data func spaces are locally Sobolev spaces. **Ch6 A non-param variat
smoothing problem studied with special interest in converge of smoother to its
data func. This smoother is the min norm interpol stabilized by a smoothing
coeff.**Ch7: A non-parametric, scalable, smoothing problem shown to converge to
its data func. We discuss the software which implements these algorithms.**Ch8:
Characterizes bounded linear functionals on data space.**Ch9 Bilinear form used
to characterize the bounded linear functionals on the data spaces generated by
the wt funcs.**Ch10 We derive an upper bound for the deriv of the 1-dim
(scaled) hat basis func smoother assuming the data func has bounded derivs and
large supp wrt. the data region.**Ch11: In one dim only; the local data funcs
are assumed to have bounded derivs on the data region and consider a scaled hat
basis func. If the basis func has large enough supp wrt. the data region then
we show the order of converg of the interpol is 1. **Ch12: Exten ops derived
based on Wloka; assumes rectangle condit.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:16:47 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 08:10:32 GMT"
},
{
"version": "v3",
"created": "Sun, 26 Sep 2010 16:50:43 GMT"
},
{
"version": "v4",
"created": "Mon, 31 Mar 2014 16:20:01 GMT"
},
{
"version": "v5",
"created": "Wed, 7 May 2014 12:19:57 GMT"
}
] | 2014-05-08T00:00:00 | [
[
"Williams",
"Phillip Y.",
""
]
] |
0708.0781 | Anca - Veronica Ion | Anca-Veronica Ion (University of Pitesti, Romania) | A new modified Galerkin method for the two-dimensional Navier-Stokes
equations | 23 pages, submitted to Journal of Computational and Applied
Mathematics | null | null | null | math.NA math.AP | null | We present a new type of modified Galerkin method. It is a construction with
several (inductively defined) levels, that provides approximate solutions of
increasing accuracy with every new level. These solutions are constructed as
approximations of the so called induced trajectories (notion on which the
definition of a class of approximate inertial manifolds used in the nonlinear
and postprocessed Galerkin methods is based).
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:42:17 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Ion",
"Anca-Veronica",
"",
"University of Pitesti, Romania"
]
] |
0708.0782 | Rodrigo Olea | Georgios Kofinas and Rodrigo Olea | Universal regularization prescription for Lovelock AdS gravity | 14 pages, no figures. A few references added, version accepted for
publication in JHEP | JHEP 0711:069,2007 | 10.1088/1126-6708/2007/11/069 | IFUM-901-FT | hep-th gr-qc | null | A definite form for the boundary term that produces the finiteness of both
the conserved quantities and Euclidean action for any Lovelock gravity with AdS
asymptotics is presented. This prescription merely tells even from odd bulk
dimensions, regardless the particular theory considered, what is valid even for
Einstein-Hilbert and Einstein-Gauss-Bonnet AdS gravity. The boundary term is a
given polynomial of the boundary extrinsic and intrinsic curvatures (also
referred to as Kounterterms series). Only the coupling constant of the boundary
term changes accordingly, such that it always preserves a well-posed
variational principle for boundary conditions suitable for asymptotically AdS
spaces. The background-independent conserved charges associated to asymptotic
symmetries are found. In odd bulk dimensions, this regularization produces a
generalized formula for the vacuum energy in Lovelock AdS gravity. The standard
entropy for asymptotically AdS black holes is recovered directly from the
regularization of the Euclidean action, and not only from the first law of
thermodynamics associated to the conserved quantities.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:43:56 GMT"
},
{
"version": "v2",
"created": "Fri, 23 Nov 2007 16:15:58 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Kofinas",
"Georgios",
""
],
[
"Olea",
"Rodrigo",
""
]
] |
0708.0783 | Li Kang | Jianhua Wang and Kang Li | The HMW effect in Noncommutative Quantum Mechanics | 8 Latex pages | J.Phys.A40:2197-2202,2007 | 10.1088/1751-8113/40/9/021 | null | hep-th | null | The HMW effect in non-commutative quantum mechanics is studied. By solving
the Dirac equations on non-commutative (NC) space and non-commutative phase
space, we obtain topological HMW phase on NC space and NC phase space
respectively, where the additional terms related to the space-space and
momentum-momentum non-commutativity are given explicitly.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:52:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wang",
"Jianhua",
""
],
[
"Li",
"Kang",
""
]
] |
0708.0784 | P. W. H. Pinkse | M. Zeppenfeld, M. Motsch, P.W.H. Pinkse, and G. Rempe | Doppler-Free Spectroscopy of Weak Transitions: An Analytical Model
Applied to Formaldehyde | 7 pages, 7 figures, 1 table, v2: many small improvements + corrected
line assignment | Applied Physics B 89(4), 475-481 (2007) | 10.1007/s00340-007-2876-3 | null | physics.optics | null | Experimental observation of Doppler-free signals for weak transitions can be
greatly facilitated by an estimate for their expected amplitudes. We derive an
analytical model which allows the Doppler-free amplitude to be estimated for
small Doppler-free signals. Application of this model to formaldehyde allows
the amplitude of experimentally observed Doppler-free signals to be reproduced
to within the experimental error.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 15:06:52 GMT"
},
{
"version": "v2",
"created": "Mon, 29 Oct 2007 12:01:10 GMT"
}
] | 2008-10-16T00:00:00 | [
[
"Zeppenfeld",
"M.",
""
],
[
"Motsch",
"M.",
""
],
[
"Pinkse",
"P. W. H.",
""
],
[
"Rempe",
"G.",
""
]
] |
0708.0785 | Will Clarkson | W. I. Clarkson, B. Enoch, C. A. Haswell, A. J. Norton, D. J.
Christian, A. Collier Cameron, S. R. Kane, K. D. Horne, T. A. Lister, R. A.
Street, R. G. West, D. M. Wilson, N. Evans, A. Fitzsimmons, C. Hellier, S.
T.Hodgkin, J. Irwin, F. P. Keenan, J. P. Osborne, N. R. Parley, D. L.
Pollacco, R. Ryans, I.Skillen, P. J. Wheatley | SuperWASP-North Extra-solar Planet Candidates between 3hr < RA < 6hr | 17 pages, 10 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12294.x | null | astro-ph | null | The Wide Angle Search for Planets (WASP) photometrically surveys a large
number of nearby stars to uncover candidate extrasolar planet systems by virtue
of small-amplitude lightcurve dips on a < 5-day timescale typical of the
``Hot-Jupiters.'' Observations with the SuperWASP-North instrument between
April and September 2004 produced a rich photometric dataset of some 1.3
billion datapoints from 6.7 million stars. Our custom-built data acquisition
and processing system produces ~0.02 mag photometric precision at V=13.
We present the transit-candidates in the 03h-06h RA range. Of 141,895
lightcurves with sufficient sampling to provide adequate coverage, 2688 show
statistically significant transit-like periodicities. Of these, 44 pass visual
inspection of the lightcurve, of which 24 are removed through a set of cuts on
the statistical significance of artefacts. All but 4 of the remaining 20
objects are removed when prior information at higher spatial-resolution from
existing catalogues is taken into account. Of the four candidates remaining,
one is considered a good candidate for follow-up observations with three
further second-priority targets. We provide detailed information on these
candidates, as well as a selection of the false-positives and astrophysical
false-alarms that were eliminated, and discuss briefly the impact of sampling
on our results.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 15:34:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Clarkson",
"W. I.",
""
],
[
"Enoch",
"B.",
""
],
[
"Haswell",
"C. A.",
""
],
[
"Norton",
"A. J.",
""
],
[
"Christian",
"D. J.",
""
],
[
"Cameron",
"A. Collier",
""
],
[
"Kane",
"S. R.",
""
],
[
"Horne",
"K. D.",
""
],
[
"Lister",
"T. A.",
""
],
[
"Street",
"R. A.",
""
],
[
"West",
"R. G.",
""
],
[
"Wilson",
"D. M.",
""
],
[
"Evans",
"N.",
""
],
[
"Fitzsimmons",
"A.",
""
],
[
"Hellier",
"C.",
""
],
[
"Hodgkin",
"S. T.",
""
],
[
"Irwin",
"J.",
""
],
[
"Keenan",
"F. P.",
""
],
[
"Osborne",
"J. P.",
""
],
[
"Parley",
"N. R.",
""
],
[
"Pollacco",
"D. L.",
""
],
[
"Ryans",
"R.",
""
],
[
"Skillen",
"I.",
""
],
[
"Wheatley",
"P. J.",
""
]
] |
0708.0786 | Alexander Voitkiv B | A. B. Voitkiv, B. Najjari, J. Ullrich | Four-body quantum dynamics of two-center electronic transitions in
relativistic ion-atom collisions and target recoil momentum spectroscopy | 5 pages, 3 figures | null | null | null | physics.atom-ph | null | We consider relativistic collisions of heavy hydrogen-like ions with hydrogen
and helium atoms in which the ion-atom interaction causes both colliding
particles to undergo transitions between their internal states. Using an
approach enabling one, for the first time, to give a detailed description of
this important case of the relativistic quantum few-body problem we concentrate
on the study of the longitudinal momentum spectrum of the atomic recoil ions.
We discuss the role of relativistic and higher order effects, predict a
surprisingly strong influence of the projectile's electron on the momentum
transfer, draw the general picture of the recoil ion formation and show that
the important information about the doubly inelastic collisions could be
obtained in experiment merely by measuring the recoil momentum spectrum.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 15:49:42 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 09:21:39 GMT"
}
] | 2007-10-04T00:00:00 | [
[
"Voitkiv",
"A. B.",
""
],
[
"Najjari",
"B.",
""
],
[
"Ullrich",
"J.",
""
]
] |
0708.0787 | Simon Dye | Simon Dye (1) and Steve Warren (2), ((1) Cardiff University, (2)
Imperial College London) | Constraints on dark and visible mass in galaxies from strong
gravitational lensing | To appear in proceedings of IAU Symposium 244, 'Dark Galaxies and
Lost Baryons', 25th - 29th June 2007. Nine pages, five figures. Version 2
updates bibliography | null | 10.1017/S1743921307013804 | null | astro-ph | null | We give a non-exhaustive review of the use of strong gravitational lensing in
placing constraints on the quantity of dark and visible mass in galaxies. We
discuss development of the methodology and summarise some recent results.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 15:54:09 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 14:34:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dye",
"Simon",
""
],
[
"Warren",
"Steve",
""
]
] |
0708.0788 | Marcin Raczkowski | Marcin Raczkowski, Manuela Capello, Didier Poilblanc, Raymond Fresard,
Andrzej M. Oles | Unidirectional d-wave superconducting domains in the two-dimensional t-J
model | 4 pages, 5 figures, minor revisions, and added references | Phys. Rev. B 76, 140505(R) (2007) | 10.1103/PhysRevB.76.140505 | null | cond-mat.str-el | null | Motivated by the recently observed pattern of unidirectional domains in
high-T_c superconductors [Y. Kohsaka et al., Science 315, 1380 (2007)], we
investigate the emergence of spontaneous modulations in the d-wave
superconducting resonating valence bond phase using the t-J model at x=1/8
doping. Half-filled charge domains separated by four lattice spacings are found
to form along one of the crystal axis leading to modulated superconductivity
with out-of-phase d-wave order parameters in neighboring domains. Both
renormalized mean-field theory and variational Monte Carlo calculations yield
that the energies of modulated and uniform phases are very close to each other.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 15:57:22 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 14:38:45 GMT"
}
] | 2007-10-20T00:00:00 | [
[
"Raczkowski",
"Marcin",
""
],
[
"Capello",
"Manuela",
""
],
[
"Poilblanc",
"Didier",
""
],
[
"Fresard",
"Raymond",
""
],
[
"Oles",
"Andrzej M.",
""
]
] |
0708.0789 | Cheng Shi Liu | C. S. Liu, W. C. Wu | Theory of point contact spectroscopy in electron-doped cuprates | 5 pages, 2 figures. Replaced with published version | Phys. Rev. B 76, 220504(R) (2007) | 10.1103/PhysRevB.76.220504 | null | cond-mat.supr-con cond-mat.str-el | null | In the hole-doped $d_{x^{2}-y^{2}}$-wave cuprate superconductor, due to the
midgap surface state (MSS), a zero bias conductance peak (ZBCP) is widely
observed in [110] interface point contact spectroscopy (PCS). However, ZBCP of
this geometry is rarely observed in the electron-doped cuprates, even though
their pairing symmetry is still likely the $d_{x^{2}-y^{2}}$-wave. We argue
that this is due to the coexistence of antiferromagnetic (AF) and the
superconducting (SC) orders. Generalizing the Blonder-Tinkham-Klapwijk (BTK)
formula to include an AF coupling, it is shown explicitly that the MSS is
destroyed by the AF order. The calculated PCS is in good agreement with the
experiments.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 16:05:26 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2007 13:31:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liu",
"C. S.",
""
],
[
"Wu",
"W. C.",
""
]
] |
0708.0790 | Fr\'ed\'eric Galliano | F. Galliano, E. Dwek and P. Chanial | Stellar Evolutionary Effects on the Abundances of PAH and SN-Condensed
Dust in Galaxies | ApJ, 69 pages, 46 figures, Accepted | null | 10.1086/523621 | null | astro-ph | null | Spectral and photometric observations of nearby galaxies show a correlation
between the strength of their mid-IR aromatic features, attributed to PAH
molecules, and their metal abundance, leading to a deficiency of these features
in low-metallicity galaxies. In this paper, we suggest that the observed
correlation represents a trend of PAH abundance with galactic age, reflecting
the delayed injection of carbon dust into the ISM by AGB stars in the final
post-AGB phase of their evolution. AGB stars are the primary sources of PAHs
and carbon dust in galaxies, and recycle their ejecta back to the interstellar
medium only after a few hundred million years of evolution on the main
sequence. In contrast, more massive stars that explode as Type II supernovae
inject their metals and dust almost instantaneously after their formation. We
first determined the PAH abundance in galaxies by constructing detailed models
of UV-to-radio SED of galaxies that estimate the contribution of dust in
PAH-free HII regions, and PAHs and dust from photodissociation regions, to the
IR emission. All model components: the galaxies' stellar content, properties of
their HII regions, and their ionizing and non-ionizing radiation fields and
dust abundances, are constrained by their observed multiwavelength spectrum.
After determining the PAH and dust abundances in 35 nearby galaxies using our
SED model, we use a chemical evolution model to show that the delayed injection
of carbon dust by AGB stars provides a natural explanation to the dependence of
the PAH content in galaxies with metallicity. We also show that larger dust
particles giving rise to the far-IR emission follow a distinct evolutionary
trend closely related to the injection of dust by massive stars into the ISM.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 16:03:49 GMT"
},
{
"version": "v2",
"created": "Thu, 1 Nov 2007 18:28:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Galliano",
"F.",
""
],
[
"Dwek",
"E.",
""
],
[
"Chanial",
"P.",
""
]
] |
0708.0791 | Adam Hill | A. B. Hill, A. J. Bird, A. J. Dean, V. A. McBride, V. Sguera, D. J.
Clark, M. Molina, S. Scaringi, S. E. Shaw | An unexpected outburst from A0535+262 | 5 pages, 4 figures, 1 table. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12326.x | null | astro-ph | null | A0535+262 is a transient Be/X-ray binary system which was in a quiescent
phase from 1994-2005. In this paper we report on the timing and spectral
properties of the INTEGRAL detection of the source in October 2003. The source
is detected for ~6000 seconds in the 18-100 keV energy band at a luminosity of
~3.8 x 10^{35} erg s^{-1}; this is compatible with the high end of the range of
luminosities expected for quiescent emission. The system is observed to be
outside of the centrifugal inhibition regime and pulsations are detected with
periodicity, P=103.7 +/- 0.1 seconds. An examination of the pulse history of
the source shows that it had been in a constant state of spin-down since it
entered the quiescent phase in 1994. The rate of spin-down implies the
consistent presence of an accretion disk supplying torques to the pulsar. The
observations show that the system is still active and highly variable even in
the absence of recent Type I or Type II X-ray outbursts.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 16:07:22 GMT"
}
] | 2007-10-08T00:00:00 | [
[
"Hill",
"A. B.",
""
],
[
"Bird",
"A. J.",
""
],
[
"Dean",
"A. J.",
""
],
[
"McBride",
"V. A.",
""
],
[
"Sguera",
"V.",
""
],
[
"Clark",
"D. J.",
""
],
[
"Molina",
"M.",
""
],
[
"Scaringi",
"S.",
""
],
[
"Shaw",
"S. E.",
""
]
] |
0708.0792 | Thomas A. Trainor | Thomas A. Trainor | The RHIC azimuth quadrupole: "perfect liquid" or gluonic radiation? | 11 pages, 6 figures | Mod.Phys.Lett.A23:569-589,2008 | 10.1142/S0217732308026637 | null | hep-ph | null | Large elliptic flow at RHIC seems to indicate that ideal hydrodynamics
provides a good description of Au-Au collisions, at least at the maximum RHIC
energy. The medium formed has been interpreted as a nearly perfect
(low-viscosity) liquid, and connections have been made to gravitation through
string theory. Recently, claimed observations of large flow fluctuations
comparable to participant eccentricity fluctuations seem to confirm the ideal
hydro scenario. However, determination of the azimuth quadrupole with 2D
angular autocorrelations, which accurately distinguish ``flow'' (quadrupole)
from ``nonflow'' (minijets), contradicts conventional interpretations.
Centrality trends may depend only on the initial parton geometry, and methods
used to isolate flow fluctuations are sensitive instead mainly to minijet
correlations. The results presented in this paper suggest that the azimuth
quadrupole may be a manifestation of gluonic multipole radiation.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 16:16:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Trainor",
"Thomas A.",
""
]
] |
0708.0793 | Dr. Bikash Chandra Paul | B. C. Paul and P. K. Chattopadhyay | Gravitational Field of A Radiating Star in Higher Dimensions | 16 pages, no figure | null | null | null | astro-ph | null | We obtain fields of a relativistic radiating star of non-static mass in the
framework of higher dimensional spacetime. Assuming energy-momentum tensor in
Higher dimensions analogous to that considered by Vaidya in 4 dimensions we
obtain solution of a radiating spherically symmetric star. The solution
obtained here is new in higher dimensions which however reduces to that
obtained by Vaidya in 4 dimensions. It is also different in form from that
obtained by Iyer and Vishveshwara. The interesting observation is that the
radius of a radiating star in higher dimensions oscillates. The radial size of
radiating star oscillates with a period which depends on the modes of vibration
and dimensions of the space-time.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 16:18:47 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Paul",
"B. C.",
""
],
[
"Chattopadhyay",
"P. K.",
""
]
] |
0708.0794 | Mark Eriksson | Nakul Shaji, C. B. Simmons, Madhu Thalakulam, Levente J. Klein, Hua
Qin, H. Luo, D. E. Savage, M. G. Lagally, A. J. Rimberg, R. Joynt, M.
Friesen, R. H. Blick, S. N. Coppersmith and M. A. Eriksson | Spin blockade and lifetime-enhanced transport in a few-electron Si/SiGe
double quantum dot | Published version. Supplementary Information in appendices | Nature Physics v4, pp540-544 (2008) | null | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin blockade occurs when an electron is unable to access an energetically
favorable path through a quantum dot due to spin conservation, resulting in a
blockade of the current through the dot. Spin blockade is the basis of a number
of recent advances in spintronics, including the measurement and the
manipulation of individual electron spins. We report measurements of the spin
blockade regime in a silicon double quantum dot, revealing a complementary
phenomenon: lifetime-enhanced transport. We argue that our observations arise
because the decay times for electron spins in silicon are long, enabling the
electron to maintain its spin throughout its transit across the quantum dot and
access fast paths that exist in some spin channels but not in others. Such long
spin lifetimes are important for applications such as quantum computation and,
more generally, spintronics.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 16:29:48 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Dec 2008 01:23:25 GMT"
}
] | 2008-12-12T00:00:00 | [
[
"Shaji",
"Nakul",
""
],
[
"Simmons",
"C. B.",
""
],
[
"Thalakulam",
"Madhu",
""
],
[
"Klein",
"Levente J.",
""
],
[
"Qin",
"Hua",
""
],
[
"Luo",
"H.",
""
],
[
"Savage",
"D. E.",
""
],
[
"Lagally",
"M. G.",
""
],
[
"Rimberg",
"A. J.",
""
],
[
"Joynt",
"R.",
""
],
[
"Friesen",
"M.",
""
],
[
"Blick",
"R. H.",
""
],
[
"Coppersmith",
"S. N.",
""
],
[
"Eriksson",
"M. A.",
""
]
] |
0708.0795 | Phil Williams | Phillip Y. Williams | A weight function theory of positive order basis function interpolants
and smoothers | Version 1: 43 pages, no figures. Version 2: Replaced a zero order
document by the consolidation of all positive order documents as requested by
Moderator. 198 pages. Version 3: 404 pages, expanded version 2 | null | null | null | math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this document I develop a weight function theory of positive order basis
function interpolants and smoothers. **In Chapter 1 the basis functions and
data spaces are defined directly using weight functions. The data spaces are
used to formulate the variational problems which define the interpolants and
smoothers discussed in later chapters. The theory is illustrated using some
standard examples of radial basis functions and two classes of weight functions
I will call the tensor product extended B-splines and the central difference
weight functions. **In Chapter 2 I derive modified inverse-Fourier transform
formulas for the basis functions and the data functions (native spaces) and to
use these formulas to obtain bounds for the rates of increase of these
functions and their derivatives near infinity. **Chapter 3 shows how to prove
functions are basis functions without using the awkward space of test functions
$S_{0,n}$ which are infinitely smooth functions of rapid decrease with several
zero-valued derivatives at the origin. Worked examples include several classes
of well-known radial basis functions. **In Chapter 4 we prove the existence and
uniqueness of a solution to the minimal seminorm interpolation problem. We then
derive orders for the pointwise convergence of the interpolant to its data
function as the density of the data increases. **In Chapter 5 a well-known
non-parametric variational smoothing problem will be studied with special
interest in the order of pointwise convergence of the smoother to its data
function. This smoothing problem is the minimal norm interpolation problem
stabilized by a smoothing coefficient. **In Chapter 6 a non-parametric,
scalable, variational smoothing problem will be studied, with special interest
in its order of pointwise convergence to its data function. **In Chapter 7 we
study the bounded linear functionals on the data spaces.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:00:09 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 08:51:32 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Mar 2014 05:42:18 GMT"
}
] | 2014-03-28T00:00:00 | [
[
"Williams",
"Phillip Y.",
""
]
] |
0708.0796 | Claudia Glasman | C Glasman | Summary of alphas determinations at ZEUS | 6 pages, 3 figures, Talk given at the ``XV International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS07)'', April 16 - 20,
2007, Munich, Germany | null | null | null | hep-ex | null | The jet cross-section and structure-function measurements done with the ZEUS
detector to extract the strong coupling constant and to test its energy-scale
dependence are summarised. The values of alphas thus obtained and the HERA
average are also presented.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:51:34 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Glasman",
"C",
""
]
] |
0708.0797 | Chong-Sun Chu | Chong-Sun Chu, Dimitrios Giataganas | Near BPS Wilson Loop in beta-deformed Theories | LaTeX. v2: corrections and comments added (22 pages). v3: proof of
the finitness of the vev of the Wilson loop is extended to the next to
leading order. appendices C and D added. version to appear in JHEP (23 pages) | JHEP 0710:108,2007 | 10.1088/1126-6708/2007/10/108 | null | hep-th | null | We propose a definition of the Wilson loop operator in the N=1 beta-deformed
supersymmetric Yang-Mills theory. Although the operator is not BPS, it has a
finite expectation value at least up to order (g^2 N)^2. This does not happen
generally for a generic non-BPS Wilson loop whose expectation value is UV
divergent. For this reason we call this a near-BPS Wilson loop and conjecture
that its exact expectation value is finite. We derive the general form of the
boundary condition satisfied by the dual string worldsheet and find that it is
deformed. Finiteness of the expectation value of the Wilson loop, together with
some rather remarkable properties of the Lunin-Maldacena metric and the
B-field, fixes the boundary condition to be one which is characterized by the
vielbein of the deformed supergravity metric. The Wilson loop operators provide
natural candidates as dual descriptions to some of the existing D-brane
configurations in the Lunin-Maldacena background. We also construct the string
dual configuration for a near-1/4 BPS circular Wilson loop operator. The string
lies on a deformed three-sphere instead of a two-sphere as in the undeformed
case. The expectation value of the Wilson loop operator is computed using the
AdS/CFT correspondence and is found to be independent of the deformation. We
conjecture that the exact expectation value of the Wilson loop is given by the
same matrix model as in the undeformed case.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:13:52 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 13:23:42 GMT"
},
{
"version": "v3",
"created": "Mon, 22 Oct 2007 10:59:28 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Chu",
"Chong-Sun",
""
],
[
"Giataganas",
"Dimitrios",
""
]
] |
0708.0798 | Jerzy Weyman M | Kiyoshi Igusa, Kent Orr, Gordana Todorov, Jerzy Weyman | Cluster Complexes via Semi-Invariants | 34 pages | null | 10.1112/S0010437X09004151 | null | math.RT math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define and study virtual representation spaces having both positive and
negative dimensions at the vertices of a quiver without oriented cycles. We
consider the natural semi-invariants on these spaces which we call virtual
semi-invariants and prove that they satisfy the three basic theorems: the First
Fundamental Theorem, the Saturation Theorem and the Canonical Decomposition
Theorem. In the special case of Dynkin quivers with n vertices this gives the
fundamental interrelationship between supports of the semi-invariants and the
Tilting Triangulation of the (n-1)-sphere.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:13:08 GMT"
},
{
"version": "v2",
"created": "Sat, 11 Oct 2008 16:51:38 GMT"
}
] | 2014-01-14T00:00:00 | [
[
"Igusa",
"Kiyoshi",
""
],
[
"Orr",
"Kent",
""
],
[
"Todorov",
"Gordana",
""
],
[
"Weyman",
"Jerzy",
""
]
] |
0708.0799 | Angel Moreno | A. J. Moreno and J. Colmenero | Tests of mode coupling theory in a simple model for two-component
miscible polymer blends | Revised version. Additional figures and citations | null | 10.1088/0953-8984/19/46/466112 | null | cond-mat.soft | null | We present molecular dynamics simulations on the structural relaxation of a
simple bead-spring model for polymer blends. The introduction of a different
monomer size induces a large time scale separation for the dynamics of the two
components. Simulation results for a large set of observables probing density
correlations, Rouse modes, and orientations of bond and chain end-to-end
vectors, are analyzed within the framework of the Mode Coupling Theory (MCT).
An unusually large value of the exponent parameter is obtained. This feature
suggests the possibility of an underlying higher-order MCT scenario for dynamic
arrest.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:19:33 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Sep 2007 20:08:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Moreno",
"A. J.",
""
],
[
"Colmenero",
"J.",
""
]
] |
0708.0800 | Sergei A. Voloshin | Sergei A. Voloshin, Arthur M. Poskanzer, Aihong Tang, Gang Wang | Elliptic flow in the Gaussian model of eccentricity fluctuations | Very minor changes, as submitted to Phys. Lett. B | Phys.Lett.B659:537-541,2008 | 10.1016/j.physletb.2007.11.043 | null | nucl-th | null | We discuss a specific model of elliptic flow fluctuations due to Gaussian
fluctuations in the initial spatial $x$ and $y$ eccentricity components
$\left\{\mean{(\sigma_y^2-\sigma_x^2)/(\sigma_x^2+\sigma_y^2)},
\mean{2\sigma_{xy}/(\sigma_x^2+\sigma_y^2)} \right\}$. We find that in this
model $\vfour$, elliptic flow determined from 4-particle cumulants, exactly
equals the average flow value in the reaction plane coordinate system,
$\mean{v_{RP}}$, the relation which, in an approximate form, was found earlier
by Bhalerao and Ollitrault in a more general analysis, but under the same
assumption that $v_2$ is proportional to the initial system eccentricity. We
further show that in the Gaussian model all higher order cumulants are equal to
$\vfour$. Analysis of the distribution in the magnitude of the flow vector, the
$Q-$distribution, reveals that it is totally defined by two parameters,
$\vtwo$, the flow from 2-particle cumulants, and $\vfour$, thus providing
equivalent information compared to the method of cumulants. The flow obtained
from the $Q-$distribution is again $\vfour=\mean{v_{RP}}$.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:22:27 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Oct 2007 20:24:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Voloshin",
"Sergei A.",
""
],
[
"Poskanzer",
"Arthur M.",
""
],
[
"Tang",
"Aihong",
""
],
[
"Wang",
"Gang",
""
]
] |
0708.0801 | Pablo Mininni | W.H. Matthaeus, A. Pouquet, P.D. Mininni, P. Dmitruk, B. Breech | Rapid directional alignment of velocity and magnetic field in
magnetohydrodynamic turbulence | 4 pages, 6 figures | Phys.Rev.Lett.100:085003,2008 | 10.1103/PhysRevLett.100.085003 | null | astro-ph | null | We show that local directional alignment of the velocity and magnetic field
fluctuations occurs rapidly in magnetohydrodynamics for a variety of
parameters. This is observed both in direct numerical simulations and in solar
wind data. The phenomenon is due to an alignment between the magnetic field and
either pressure gradients or shear-associated kinetic energy gradients. A
similar alignment, of velocity and vorticity, occurs in the Navier Stokes fluid
case. This may be the most rapid and robust relaxation process in turbulent
flows, and leads to a local weakening of the nonlinear terms in the small scale
vorticity and current structures where alignment takes place.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:47:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Matthaeus",
"W. H.",
""
],
[
"Pouquet",
"A.",
""
],
[
"Mininni",
"P. D.",
""
],
[
"Dmitruk",
"P.",
""
],
[
"Breech",
"B.",
""
]
] |
0708.0802 | David Ridout | Pierre Mathieu and David Ridout | From Percolation to Logarithmic Conformal Field Theory | 12 pages, 2 figures, minor changes made | Phys.Lett.B657:120-129,2007 | 10.1016/j.physletb.2007.10.007 | null | hep-th math-ph math.MP | null | The smallest deformation of the minimal model M(2,3) that can accommodate
Cardy's derivation of the percolation crossing probability is presented. It is
shown that this leads to a consistent logarithmic conformal field theory at
c=0. A simple recipe for computing the associated fusion rules is given. The
differences between this theory and the other recently proposed c=0 logarithmic
conformal field theories are underlined. The discussion also emphasises the
existence of invariant logarithmic couplings that generalise Gurarie's anomaly
number.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:36:13 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 14:04:47 GMT"
},
{
"version": "v3",
"created": "Fri, 19 Oct 2007 07:16:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mathieu",
"Pierre",
""
],
[
"Ridout",
"David",
""
]
] |
0708.0803 | Scott A. Yost | M.Yu. Kalmykov, B.F.L. Ward, S.A. Yost | On the all-order epsilon-expansion of generalized hypergeometric
functions with integer values of parameters | 12 pages, Latex + amsmath, JHEP3 class packages. This revision adds
references 1 and 19. The FORM code is available via the WWW at
http://theor.jinr.ru/~kalmykov/hypergeom/hyper.html | JHEP 0711:009,2007 | 10.1088/1126-6708/2007/11/009 | BU-HEPP-07-09 | hep-th hep-ph math-ph math.CA math.MP | null | We continue our study of the construction of analytical coefficients of the
epsilon-expansion of hypergeometric functions and their connection with Feynman
diagrams. In this paper, we apply the approach of obtaining iteratated
solutions to the differential equations associated with hypergeometric
functions to prove the following result (Theorem 1): The epsilon-expansion of a
generalized hypergeometric function with integer values of parameters is
expressible in terms of generalized polylogarithms with coefficients that are
ratios of polynomials. The method used in this proof provides an efficient
algorithm for calculatiing of the higher-order coefficients of Laurent
expansion.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:39:28 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Nov 2007 03:59:27 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Kalmykov",
"M. Yu.",
""
],
[
"Ward",
"B. F. L.",
""
],
[
"Yost",
"S. A.",
""
]
] |
0708.0804 | Chaohui Zhang | Chaohui Zhang | Some pseudo-Anosov maps on punctured Riemann surfaces represented by
multi-twists | This paper has been withdrawn | null | null | null | math.GT math.CV | null | This paper has been withdrawn by the author
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:45:01 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jan 2008 15:04:54 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Zhang",
"Chaohui",
""
]
] |
0708.0805 | Lun Dong | Lun Dong, Athina P. Petropulu and H. Vincent Poor | Cooperative Beamforming for Wireless Ad Hoc Networks | 5 pages, 4 figures. To appear in the Proceedings of the IEEE Global
Communications Conference (GLOBECOM), Washington, DC, November 26 - 30, 2007 | null | 10.1109/GLOCOM.2007.560 | null | cs.IT math.IT | null | Via collaborative beamforming, nodes in a wireless network are able to
transmit a common message over long distances in an energy efficient fashion.
However, the process of making available the same message to all collaborating
nodes introduces delays. In this paper, a MAC-PHY cross-layer scheme is
proposed that enables collaborative beamforming at significantly reduced
collaboration overhead. It consists of two phases. In the first phase, nodes
transmit locally in a random access time-slotted fashion. Simultaneous
transmissions from multiple source nodes are viewed as linear mixtures of all
transmitted packets. In the second phase, a set of collaborating nodes, acting
as a distributed antenna system, beamform the received analog waveform to one
or more faraway destinations. This step requires multiplication of the received
analog waveform by a complex weight, which is independently computed by each
cooperating node, and which allows packets bound to the same destination to add
coherently at the destination node. Assuming that each node has access to
location information, the proposed scheme can achieve high throughput, which in
certain cases exceeds one. An analysis of the symbol error probability
corresponding to the proposed scheme is provided.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:45:21 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Dong",
"Lun",
""
],
[
"Petropulu",
"Athina P.",
""
],
[
"Poor",
"H. Vincent",
""
]
] |
0708.0806 | Michael A. Soloviev | Michael A. Soloviev (Lebedev Physical Institute) | Decomposition theorems and kernel theorems for a class of functional
spaces | AMS-LaTeX, 22 pages, no figures | Izvestiya: Mathematics 70:5 (2006) 1051-1076, Izvestiya RAN: Ser.
Mat. 70:5 (2006) 199-224 | null | null | math.FA math-ph math.MP | null | We prove new theorems about properties of generalized functions defined on
Gelfand-Shilov spaces $S^\beta$ with $0\le\beta<1$. For each open cone
$U\subset\mathbb R^d$ we define a space $S^\beta(U)$ which is related to
$S^\beta(\mathbb R^d)$ and consists of entire analytic functions rapidly
decreasing inside U and having order of growth $\le 1/(1-\beta)$ outside the
cone. Such sheaves of spaces arise naturally in nonlocal quantum field theory,
and this motivates our investigation. We prove that the spaces $S^\beta(U)$ are
complete and nuclear and establish a decomposition theorem which implies that
every continuous functional defined on $S^\beta(\mathbb R^d)$ has a unique
minimal closed carrier cone in $\mathbb R^d$. We also prove kernel theorems for
spaces over open and closed cones and elucidate the relation between the
carrier cones of multilinear forms and those of the generalized functions
determined by these forms.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:45:23 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Soloviev",
"Michael A.",
"",
"Lebedev Physical Institute"
]
] |
0708.0807 | Maxim M. Korshunov | M.M. Korshunov, I. Eremin | Dynamical magnetic susceptibility in the lamellar cobaltate
superconductor Na_xCoO_2$\cdot y$H_2O | Published version, PACS: 74.70.-b; 75.40.Gb; 74.20.Rp; 74.25.Jb | Phys. Rev. B 77, 064510 (2008) | 10.1103/PhysRevB.77.064510 | null | cond-mat.supr-con cond-mat.str-el | null | We systematically analyze the influence of the superconducting gap symmetry
and the electronic structure on the dynamical spin susceptibility in
superconducting Na_xCoO_2$\cdot y$H_2O within a three different models: the
single a_{1g}-band model with nearest-neighbor hoppings, the realistic
three-band t_{2g}-model with, and without e'_g pockets present at the Fermi
surface. We show that the magnetic response in the normal state is dominated by
the incommensurate antiferromagnetic spin density wave fluctuations at large
momenta in agreement with experimental temperature dependence of the
spin-lattice relaxation rate. Also, we demonstrate that the presence or the
absence of the e'_g-pockets at the Fermi surface does not affect significantly
this conclusion. In the superconducting state our results for d_{x^2-y^2}- or
d_{xy}-wave symmetries of the superconducting order parameter are consistent
with experimental data and exclude nodeless $d_{x^2-y^2} + id_{xy}$-wave
symmetry. We further point out that the spin-resonance peak proposed earlier is
improbable for the realistic band structure of Na_xCoO_2$\cdot y$H_2O.
Moreover, even if present the resonance peak is confined to the
antiferromagnetic wave vector and disappears away from it.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:45:56 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 13:51:07 GMT"
}
] | 2008-02-18T00:00:00 | [
[
"Korshunov",
"M. M.",
""
],
[
"Eremin",
"I.",
""
]
] |
0708.0808 | David Collins | Tomasz M. Kott (1) and David Collins (2) ((1) University of Maryland,
College Park, MD (2) Mesa State College, Grand Junction, CO) | Statistical comparison of ensemble implementations of Grover's search
algorithm to classical sequential searches | null | null | 10.1103/PhysRevA.77.052314 | null | quant-ph | null | We compare pseudopure state ensemble implementations, quantified by their
initial polarization and ensemble size, of Grover's search algorithm to
probabilistic classical sequential search algorithms in terms of their success
and failure probabilities. We propose a criterion for quantifying the resources
used by the ensemble implementation via the aggregate number of oracle
invocations across the entire ensemble and use this as a basis for comparison
with classical search algorithms. We determine bounds for a critical
polarization such that the ensemble algorithm succeeds with a greater
probability than the probabilistic classical sequential search. Our results
indicate that the critical polarization scales as N^(-1/4) where N is the
database size and that for typical room temperature solution state NMR, the
polarization is such that the ensemble implementation of Grover's algorithm
would be advantageous for N > 10^22
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 17:47:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kott",
"Tomasz M.",
""
],
[
"Collins",
"David",
""
]
] |
0708.0809 | Hector Blandin | Hector Blandin and Rafael Diaz | Compositional Bernoulli numbers | 16 pages, to appear in Afr. Diaspora J. Math | Afr. Diaspora J. Math. Volume 7, Issue 2, pp. 27--42 (2008) | null | null | math.CO | null | We define and study the combinatorial properties of compositional
Bernoulli numbers and polynomials within the framework of rational
combinatorics.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:05:51 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Apr 2008 12:03:13 GMT"
}
] | 2009-05-27T00:00:00 | [
[
"Blandin",
"Hector",
""
],
[
"Diaz",
"Rafael",
""
]
] |
0708.0810 | Herwig Ott | T. Gericke, P. Wuertz, D. Reitz, C. Utfeld, H. Ott | All-optical formation of a Bose-Einstein condensate for applications in
scanning electron microscopy | 5 pages, 4 figures | null | 10.1007/s00340-007-2862-9 | null | cond-mat.stat-mech | null | We report on the production of a F=1 spinor condensate of 87Rb atoms in a
single beam optical dipole trap formed by a focused CO2 laser. The condensate
is produced 13mm below the tip of a scanning electron microscope employing
standard all-optical techniques. The condensate fraction contains up to 100,000
atoms and we achieve a duty cycle of less than 10s.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:10:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gericke",
"T.",
""
],
[
"Wuertz",
"P.",
""
],
[
"Reitz",
"D.",
""
],
[
"Utfeld",
"C.",
""
],
[
"Ott",
"H.",
""
]
] |
0708.0811 | Michael A. Soloviev | Michael A. Soloviev (Lebedev Physical Institute) | Star product algebras of test functions | AMS-LaTeX, 12 pages, no figures; typos corrected, minor changes to
agree with published version | Theor.Math.Phys.153:1351-1363,2007; Teor.Mat.Fiz.153:3-17,2007 | 10.1007/s11232-007-0119-8 | FIAN-TD/2007-16 | math-ph hep-th math.MP math.QA | null | We prove that the Gelfand-Shilov spaces $S^\beta_\alpha$ are topological
algebras under the Moyal star product if and only if $\alpha\ge\beta$. These
spaces of test functions can be used in quantum field theory on noncommutative
spacetime. The star product depends on the noncommutativity parameter
continuously in their topology. We also prove that the series expansion of the
Moyal product converges absolutely in $S^\beta_\alpha$ if and only if
$\beta<1/2$.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:12:46 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 15:35:11 GMT"
}
] | 2010-12-15T00:00:00 | [
[
"Soloviev",
"Michael A.",
"",
"Lebedev Physical Institute"
]
] |
0708.0812 | Peter Arnold | Peter Arnold | Quark-Gluon Plasmas and Thermalization | 40 pages; based on lectures given at X Hadron Physics in
Florianopolis, SC, Brazil, March 26-31, 2007 [another small typo fixed] | Int.J.Mod.Phys.E16:2555-2594,2007 | 10.1142/S021830130700832X | null | hep-ph nucl-th | null | In these lectures, I will attempt a pedagogical and qualitative introduction
to the theory of equilibrium and thermalization of quark-gluon plasmas. I
assume only that the reader is familiar with quantum field theory at zero
temperature and with QCD as the theory of the strong interactions. I focus on
the limit of small alpha_s, which in principle should be relevant at extremely
high temperature because of asymptotic freedom, and in any case provides a
clean theoretical context in which to discuss a variety of phenomena. Topics
discussed include the basic equilibrium formalism for finite-temperature
quantum field theory, Debye screening, electric deconfinement, magnetic
confinement, dimensional reduction, plasma waves, kinetic theory, hydrodynamic
properties such as viscosity, the Landau-Pomeranchuk-Migdal effect,
thermalization in (arbitrarily high energy) heavy ion collisions, and QCD
plasma instabilities.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 19:02:13 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Aug 2007 15:13:05 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Sep 2007 17:39:09 GMT"
},
{
"version": "v4",
"created": "Mon, 14 Jan 2008 22:06:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Arnold",
"Peter",
""
]
] |
0708.0813 | Tomasz Paterek | Tomasz Paterek, Alessandro Fedrizzi, Simon Groeblacher, Thomas
Jennewein, Marek Zukowski, Markus Aspelmeyer, Anton Zeilinger | Experimental test of nonlocal realistic theories without the rotational
symmetry assumption | Published version | Phys. Rev. Lett. 99, 210406 (2007) | 10.1103/PhysRevLett.99.210406 | null | quant-ph | null | We analyze the class of nonlocal realistic theories that was originally
considered by Leggett [Found. Phys. 33, 1469 (2003)] and tested by us in a
recent experiment [Nature (London) 446, 871 (2007)]. We derive an
incompatibility theorem that works for finite numbers of polarizer settings and
that does not require the previously assumed rotational symmetry of the
two-particle correlation functions. The experimentally measured case involves
seven different measurement settings. Using polarization-entangled photon
pairs, we exclude this broader class of nonlocal realistic models by
experimentally violating a new Leggett-type inequality by 80 standard
deviations.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:21:42 GMT"
},
{
"version": "v2",
"created": "Fri, 23 Nov 2007 16:31:42 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Paterek",
"Tomasz",
""
],
[
"Fedrizzi",
"Alessandro",
""
],
[
"Groeblacher",
"Simon",
""
],
[
"Jennewein",
"Thomas",
""
],
[
"Zukowski",
"Marek",
""
],
[
"Aspelmeyer",
"Markus",
""
],
[
"Zeilinger",
"Anton",
""
]
] |
0708.0814 | Linda J. Smith | L.J. Smith, N. Bastian, I.S. Konstantopoulos, J.S. Gallagher, M.
Gieles, R. de Grijs, S.S. Larsen, R.W. O'Connell, M.S. Westmoquette | The Young Cluster Population of M82 Region B | 11 pages, 4 figures, accepted for publication in ApJ Letters | null | 10.1086/522120 | null | astro-ph | null | We present observations obtained with the Advanced Camera for Surveys on
board the Hubble Space Telescope of the "fossil" starburst region B in the
nearby starburst galaxy M82. By comparing UBVI photometry with models, we
derive ages and extinctions for 35 U-band selected star clusters. We find that
the peak epoch of cluster formation occurred ~ 150 Myr ago, in contrast to
earlier work that found a peak formation age of 1.1 Gyr. The difference is most
likely due to our inclusion of U-band data, which are essential for accurate
age determinations of young cluster populations. We further show that the
previously reported turnover in the cluster luminosity function is probably due
to the neglect of the effect of extended sources on the detection limit. The
much younger cluster ages we derive clarifies the evolution of the M82
starburst. The M82-B age distribution now overlaps with the ages of: the
nuclear starburst; clusters formed on the opposite side of the disk; and the
last encounter with M81, some 220 Myr ago.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:32:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Smith",
"L. J.",
""
],
[
"Bastian",
"N.",
""
],
[
"Konstantopoulos",
"I. S.",
""
],
[
"Gallagher",
"J. S.",
""
],
[
"Gieles",
"M.",
""
],
[
"de Grijs",
"R.",
""
],
[
"Larsen",
"S. S.",
""
],
[
"O'Connell",
"R. W.",
""
],
[
"Westmoquette",
"M. S.",
""
]
] |
0708.0815 | Massimiliano (Max) Bonamente | Massimiliano Bonamente, Marshall Joy, Samuel LaRoque, John Carlstrom,
Daisuke Nagai, Dan Marrone | Scaling Relations from Sunyaev-Zel'dovich Effect and Chandra X-ray
measurements of high-redshift galaxy clusters | ApJ in press | Astrophys.J 675:106-114, 2008 | 10.1086/525517 | null | astro-ph | null | We present Sunyaev-Zel'dovich Effect (SZE) scaling relations for 38 massive
galaxy clusters at redshifts 0.14<z0.89, observed with both the Cchandra X-ray
Observatory and the centimeter-wave SZE imaging system at the BIMA and OVRO
interferometric arrays. An isothermal beta-model with central 100 kpc excluded
from the X-ray data is used to model the intracluster medium and to measure
global cluster properties. For each cluster, we measure the X-ray spectroscopic
temperature, SZE gas mass, total mass and integrated Compton-y parameters
within r_2500. Our measurements are in agreement with the expectations based on
a simple self-similar model of cluster formation and evolution. We compare the
cluster properties derived from our SZE observations with and without Chandra
spatial and spectral information and find them to be in good agreement. We
compare our results with cosmological numerical simulations, and find that
simulations that include radiative cooling, star formation and feedback match
well both the slope and normalization of our SZE scaling relations.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:36:33 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Nov 2007 22:56:28 GMT"
}
] | 2011-02-11T00:00:00 | [
[
"Bonamente",
"Massimiliano",
""
],
[
"Joy",
"Marshall",
""
],
[
"LaRoque",
"Samuel",
""
],
[
"Carlstrom",
"John",
""
],
[
"Nagai",
"Daisuke",
""
],
[
"Marrone",
"Dan",
""
]
] |
0708.0816 | Bronislav Zakharov | B.G. Zakharov | Parton energy loss in an expanding quark-gluon plasma: Radiative vs
collisional | 13 pages, 3 figures | JETPLett.86:444-450,2007 | 10.1134/S0021364007190034 | null | hep-ph | null | We perform a comparison of the radiative and collisional parton energy losses
in an expanding quark-gluon plasma. The radiative energy loss is calculated
within the light-cone path integral approach. The collisional energy loss is
calculated using the Bjorken method with an accurate treatment of the binary
collision kinematics. Our numerical results demonstrate that for RHIC and LHC
conditions the collisional energy loss is relatively small in comparison to the
radiative one. We find an enhancement of the heavy quark radiative energy loss
as compared to that of the light quarks at high energies.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:40:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zakharov",
"B. G.",
""
]
] |
0708.0817 | Jonathan Sands | Jonathan W. Sands | Values at s=-1 of L-functions for multi-quadratic extensions of number
fields, and the fitting ideal of the tame kernel | null | null | null | null | math.NT math.KT | null | Fix a Galois extension E/F of totally real number fields such that the Galois
group G has exponent 2. Let S be a finite set of primes of F containing the
infinite primes and all those which ramify in E, let S_E denote the primes of E
lying above those in S, and let O_E^S denote the ring of S_E-integers of E. We
then compare the Fitting ideal of K_2(O_E^S) as a Z[G]-module with a higher
Stickelberger ideal. The two extend to the same ideal in the maximal order of
Q[G], and hence in Z[1/2][G]. Results in Z[G] are obtained under the assumption
of the Birch-Tate conjecture, especially for biquadratic extensions, where we
compute the index of the higher Stickelberger ideal.
We find a sufficient condition for the Fitting ideal to contain the higher
Stickelberger ideal in the case where E is a biquadratic extension of F
containing the first layer of the cyclotomic Z_2-extension of F, and describe a
class of biquadratic extensions of F=Q that satisfy this condition.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:43:06 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Sands",
"Jonathan W.",
""
]
] |
0708.0818 | Anastasia Volovich | Antal Jevicki, Chrysostomos Kalousios, Marcus Spradlin, Anastasia
Volovich | Dressing the Giant Gluon | 19 pages, 3 figures, harvmac | JHEP 0712:047,2007 | 10.1088/1126-6708/2007/12/047 | null | hep-th | null | We demonstrate the applicability of the dressing method to the problem of
constructing new classical solutions for Euclidean worldsheets in anti-de
Sitter space. The motivation stems from recent work of Alday and Maldacena, who
studied gluon scattering amplitudes at strong coupling using a generalization
of a particular worldsheet found by Kruczenski whose edge traces a path
composed of light-light segments on the boundary of AdS. We dress this `giant
gluon' to find new solutions in AdS_3 and AdS_5 whose edges trace out more
complicated, timelike curves on the boundary. These solutions may be used to
calculate certain Wilson loops via AdS/CFT.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:50:53 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Jevicki",
"Antal",
""
],
[
"Kalousios",
"Chrysostomos",
""
],
[
"Spradlin",
"Marcus",
""
],
[
"Volovich",
"Anastasia",
""
]
] |
0708.0819 | Aashish Clerk | P. Vitushinsky, A. A. Clerk and K. Le Hur | Shot Noise in SU(N) Quantum Dot Kondo Effects | 4+ pages; error in numerical prefactor describing interaction effect
on noise corrected | Phys. Rev. Lett. 100, 036603 (2008) | 10.1103/PhysRevLett.100.036603 | null | cond-mat.mes-hall | null | We study shot noise in the current of quantum dots whose low-energy behaviour
corresponds to an SU(N) Kondo model, focusing on the case N=4 relevant to
carbon nanotube dots. For general N, two-particle Fermi liquid interactions
have two distinct effects: they can enhance the noise via back-scattering
processes with an N-dependent effective charge, and can also modify the
coherent partition noise already present without interactions. For N=4, in
contrast to the SU(2) case, interactions enhance shot noise solely through an
enhancement of partition noise. This leads to a non-trivial prediction for
experiment.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 19:29:11 GMT"
},
{
"version": "v2",
"created": "Sun, 16 Sep 2007 22:39:50 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Vitushinsky",
"P.",
""
],
[
"Clerk",
"A. A.",
""
],
[
"Hur",
"K. Le",
""
]
] |
0708.0820 | Miguel Trinidad | M.A. Trinidad, J.M. Torrelles, L.F. Rodriguez, S. Curiel | Multiple Sources toward the High-mass Young Star S140 IRS1 | 17 pages, 4 figures, to be published in AJ | Astron.J.134:1870-1876,2007 | 10.1086/521926 | null | astro-ph | null | S140 IRS1 is a remarkable source where the radio source at the center of the
main bipolar molecular outflow in the region is elongated perpendicular to the
axis of the outflow, an orientation opposite to that expected if the radio
source is a thermal jet exciting the outflow. We present results of 1.3 cm
continuum and H2O maser emission observations made with the VLA in its A
configuration toward this region. In addition, we also present results of
continuum observations at 7 mm and re-analyse observations at 2, 3.5 and 6 cm
(previously published). IRS 1A is detected at all wavelengths, showing an
elongated structure. Three water maser spots are detected along the major axis
of the radio source IRS 1A. We have also detected a new continuum source at 3.5
cm (IRS 1C) located ~0.6'' northeast of IRS 1A. The presence of these two YSOs
(IRS 1A and 1C) could explain the existence of the two bipolar molecular
outflows observed in the region. In addition, we have also detected three
continuum clumps (IRS 1B, 1D and 1E) located along the major axis of IRS 1A. We
discuss two possible models to explain the nature of IRS 1A: a thermal jet and
an equatorial wind.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:59:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Trinidad",
"M. A.",
""
],
[
"Torrelles",
"J. M.",
""
],
[
"Rodriguez",
"L. F.",
""
],
[
"Curiel",
"S.",
""
]
] |
0708.0821 | Ben Davies | Ben Davies (RIT), Don F. Figer (RIT), Rolf-Peter Kudritzki (IfA,
Hawaii), John MacKenty (STScI), Francisco Najarro (CSIC, Madrid) and Artemio
Herrero (IAC, Spain) | A massive cluster of Red Supergiants at the base of the Scutum-Crux arm | 49 pages, 22 figures. Accepted for publication in ApJ. Version with
hi-res figures can be found at http://www.cis.rit.edu/~bxdpci/RSGC2.pdf | null | 10.1086/522224 | null | astro-ph | null | We report on the unprecedented Red Supergiant (RSG) population of a massive
young cluster, located at the base of the Scutum-Crux Galactic arm. We identify
candidate cluster RSGs based on {\it 2MASS} photometry and medium resolution
spectroscopy. With follow-up high-resolution spectroscopy, we use CO-bandhead
equivalent width and high-precision radial velocity measurements to identify a
core grouping of 26 physically-associated RSGs -- the largest such cluster
known to-date. Using the stars' velocity dispersion, and their inferred
luminosities in conjuction with evolutionary models, we argue that the cluster
has an initial mass of $\sim$40,000\msun, and is therefore among the most
massive in the galaxy. Further, the cluster is only a few hundred parsecs away
from the cluster of 14 RSGs recently reported by Figer et al (2006). These two
RSG clusters represent 20% of all known RSGs in the Galaxy, and now offer the
unique opportunity to study the pre-supernova evolution of massive stars, and
the Blue- to Red-Supergiant ratio at uniform metallicity. We use GLIMPSE,
MIPSGAL and MAGPIS survey data to identify several objects in the field of the
larger cluster which seem to be indicative of recent region-wide starburst
activity at the point where the Scutum-Crux arm intercepts the Galactic bulge.
Future abundance studies of these clusters will therefore permit the study of
the chemical evolution and metallicity gradient of the Galaxy in the region
where the disk meets the bulge.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 19:02:39 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 15:24:37 GMT"
},
{
"version": "v3",
"created": "Tue, 25 Sep 2007 13:34:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Davies",
"Ben",
"",
"RIT"
],
[
"Figer",
"Don F.",
"",
"RIT"
],
[
"Kudritzki",
"Rolf-Peter",
"",
"IfA,\n Hawaii"
],
[
"MacKenty",
"John",
"",
"STScI"
],
[
"Najarro",
"Francisco",
"",
"CSIC, Madrid"
],
[
"Herrero",
"Artemio",
"",
"IAC, Spain"
]
] |
0708.0822 | Mercedes Lopez-Morales | Mercedes Lopez-Morales and Sara Seager | Thermal Emission from Transiting Very-Hot Jupiters: Prospects for
Ground-based Detection at Optical Wavelengths | accepted for publication on ApJL | null | 10.1086/522118 | null | astro-ph | null | Very hot Jupiters (VHJs) are defined as Jupiter-mass extrasolar planets with
orbital periods shorter than three days. For low albedos the effective
temperatures of irradiated VHJs can reach 2500-3000 K. Thermal emission from
VHJs is therefore potentially strong at optical wavelengths. We explore the
prospects of detecting optical-wavelength thermal emission during secondary
eclipse with existing ground-based telescopes. We show that OGLE-TR-56b and
OGLE-TR-132b are the best suited candidates for detection, and that the
prospects are highest around z'-band (~0.9 microns). We also speculate that any
newly discovered VHJs with the right combination of orbital separation and host
star parameters could be thermally detected in the optical. The lack of
detections would still provide constraints on the planetary albedos and
re-radiation factors.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 19:04:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lopez-Morales",
"Mercedes",
""
],
[
"Seager",
"Sara",
""
]
] |
0708.0823 | Tristan Maillard | T. Maillard | Toward metastable string vacua from magnetized branes | 28 pages | null | null | null | hep-th | null | The scalar potential of recombination fields of magnetized branes in Type IIB
orientifold compactifications is analyzed in the absence of any closed string
fluxes. Considering its perturbative F and D-term contributions in a quadratic
approximation, we present the conditions for which its minima are
supersymmetric. We show that for reasonable conditions on the spectrum, both
metric moduli and recombination fields can be stabilized. We then provide
explicit examples of compact manifolds where a Minkowski vacuum is realized in
a Higgs phase. The vacuum energy is zero and some charged scalars acquire a
vev. We then address the question of supersymmetry breaking. The scalar
potential for recombination fields is analyzed when supersymmetry is broken by
F and D-term. We show that locally stable vacua can exist at the classical
level. These are formed by a hidden supersymmetric sector that fixes metric
moduli and recombination fields and a visible sector where supersymmetry is
spontaneously broken.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 19:57:11 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Maillard",
"T.",
""
]
] |
0708.0824 | John Mackay | John M. Mackay | Existence of quasi-arcs | 7 pages; minor changes | Proc. Amer. Math. Soc. 136 (2008), no. 11, 3975--3981 | 10.1090/S0002-9939-08-09444-6 | null | math.MG math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that doubling, linearly connected metric spaces are quasi-arc
connected. This gives a new and short proof of a theorem of Tukia.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 19:35:58 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Dec 2009 18:47:19 GMT"
}
] | 2009-12-21T00:00:00 | [
[
"Mackay",
"John M.",
""
]
] |
0708.0825 | Masamune Oguri | Masamune Oguri, Naohisa Inada, Michael A. Strauss, Christopher S.
Kochanek, Gordon T. Richards, Donald P. Schneider, Robert H. Becker, Masataka
Fukugita, Michael D. Gregg, Patrick B. Hall, Joseph F. Hennawi, David E.
Johnston, Issha Kayo, Charles R. Keeton, Bartosz Pindor, Min-Su Shin, Edwin
L. Turner, Richard L. White, Donald G. York, Scott F. Anderson, Neta A.
Bahcall, Robert J. Brunner, Scott Burles, Francisco J. Castander, Kuenley
Chiu, Alejandro Clocchiatti, Daniel Eisenstein, Joshua A. Frieman, Yozo
Kawano, Robert Lupton, Tomoki Morokuma, Hans-Walter Rix, Ryan Scranton, Erin
Scott Sheldon | The Sloan Digital Sky Survey Quasar Lens Search. III. Constraints on
Dark Energy from the Third Data Release Quasar Lens Catalog | 9 pages, 3 figures, 2 tables, accepted for publication in AJ | Astron.J.135:512-519,2008 | 10.1088/0004-6256/135/2/512 | SLAC-PUB-12707 | astro-ph | null | We present cosmological results from the statistics of lensed quasars in the
Sloan Digital Sky Survey (SDSS) Quasar Lens Search. By taking proper account of
the selection function, we compute the expected number of quasars lensed by
early-type galaxies and their image separation distribution assuming a flat
universe, which is then compared with 7 lenses found in the SDSS Data Release 3
to derive constraints on dark energy under strictly controlled criteria. For a
cosmological constant model (w=-1) we obtain
\Omega_\Lambda=0.74^{+0.11}_{-0.15}(stat.)^{+0.13}_{-0.06}(syst.). Allowing w
to be a free parameter we find
\Omega_M=0.26^{+0.07}_{-0.06}(stat.)^{+0.03}_{-0.05}(syst.) and
w=-1.1\pm0.6(stat.)^{+0.3}_{-0.5}(syst.) when combined with the constraint from
the measurement of baryon acoustic oscillations in the SDSS luminous red galaxy
sample. Our results are in good agreement with earlier lensing constraints
obtained using radio lenses, and provide additional confirmation of the
presence of dark energy consistent with a cosmological constant, derived
independently of type Ia supernovae.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:41:16 GMT"
},
{
"version": "v2",
"created": "Tue, 30 Oct 2007 17:40:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Oguri",
"Masamune",
""
],
[
"Inada",
"Naohisa",
""
],
[
"Strauss",
"Michael A.",
""
],
[
"Kochanek",
"Christopher S.",
""
],
[
"Richards",
"Gordon T.",
""
],
[
"Schneider",
"Donald P.",
""
],
[
"Becker",
"Robert H.",
""
],
[
"Fukugita",
"Masataka",
""
],
[
"Gregg",
"Michael D.",
""
],
[
"Hall",
"Patrick B.",
""
],
[
"Hennawi",
"Joseph F.",
""
],
[
"Johnston",
"David E.",
""
],
[
"Kayo",
"Issha",
""
],
[
"Keeton",
"Charles R.",
""
],
[
"Pindor",
"Bartosz",
""
],
[
"Shin",
"Min-Su",
""
],
[
"Turner",
"Edwin L.",
""
],
[
"White",
"Richard L.",
""
],
[
"York",
"Donald G.",
""
],
[
"Anderson",
"Scott F.",
""
],
[
"Bahcall",
"Neta A.",
""
],
[
"Brunner",
"Robert J.",
""
],
[
"Burles",
"Scott",
""
],
[
"Castander",
"Francisco J.",
""
],
[
"Chiu",
"Kuenley",
""
],
[
"Clocchiatti",
"Alejandro",
""
],
[
"Eisenstein",
"Daniel",
""
],
[
"Frieman",
"Joshua A.",
""
],
[
"Kawano",
"Yozo",
""
],
[
"Lupton",
"Robert",
""
],
[
"Morokuma",
"Tomoki",
""
],
[
"Rix",
"Hans-Walter",
""
],
[
"Scranton",
"Ryan",
""
],
[
"Sheldon",
"Erin Scott",
""
]
] |
0708.0826 | Roelof S. de Jong | Roelof S. de Jong, A.C. Seth, D.J. Radburn-Smith, E.F. Bell, T.M.
Brown, J.S. Bullock, S. Courteau, J.J. Dalcanton, H.C. Ferguson, P.
Goudfrooij, S. Holfeltz, B.W. Holwerda, C. Purcell, J. Sick, D.B. Zucker | Stellar populations across the NGC4244 truncated galactic disk | ApJ Letters, in press. Five pages, 2 figures | null | 10.1086/522035 | null | astro-ph | null | We use HST/ACS to study the resolved stellar populations of the nearby,
nearly edge-on galaxy NGC4244 across its outer disk surface density break. The
stellar photometry allows us to study the distribution of different stellar
populations and reach very low equivalent surface brightnesses. We find that
the break occurs at the same radius for young, intermediate age, and old stars.
The stellar density beyond the break drops sharply by a factor of at least 600
in 5 kpc. The break occurs at the same radius independent of height above the
disk, but is sharpest in the midplane and nearly disappears at large heights.
These results make it unlikely that truncations are caused by a star formation
threshold alone: the threshold would have to keep the same radial position from
less than 100 Myr to 10 Gyr ago, in spite of potential disturbances such as
infall and redistribution of gas by internal processes. A dynamical
interpretation of truncation formation is more likely such as due to angular
momentum redistribution by bars or density waves, or heating and stripping of
stars caused by the bombardment of dark matter sub-halos. The latter
explanation is also in quantitative agreement with the small diffuse component
we see around the galaxy.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:05:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Jong",
"Roelof S.",
""
],
[
"Seth",
"A. C.",
""
],
[
"Radburn-Smith",
"D. J.",
""
],
[
"Bell",
"E. F.",
""
],
[
"Brown",
"T. M.",
""
],
[
"Bullock",
"J. S.",
""
],
[
"Courteau",
"S.",
""
],
[
"Dalcanton",
"J. J.",
""
],
[
"Ferguson",
"H. C.",
""
],
[
"Goudfrooij",
"P.",
""
],
[
"Holfeltz",
"S.",
""
],
[
"Holwerda",
"B. W.",
""
],
[
"Purcell",
"C.",
""
],
[
"Sick",
"J.",
""
],
[
"Zucker",
"D. B.",
""
]
] |
0708.0827 | Benjamin F. Toner | Oded Regev and Ben Toner | Simulating Quantum Correlations with Finite Communication | 19 pages, 3 figures, preliminary version in IEEE FOCS 2007; to appear
in SICOMP | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assume Alice and Bob share some bipartite $d$-dimensional quantum state. A
well-known result in quantum mechanics says that by performing two-outcome
measurements, Alice and Bob can produce correlations that cannot be obtained
locally, i.e., with shared randomness alone. We show that by using only two
bits of communication, Alice and Bob can classically simulate any such
correlations. All previous protocols for exact simulation required the
communication to grow to infinity with the dimension $d$. Our protocol and
analysis are based on a power series method, resembling Krivine's bound on
Grothendieck's constant, and on the computation of volumes of spherical
tetrahedra.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 12:48:48 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Jun 2009 13:21:56 GMT"
}
] | 2009-06-24T00:00:00 | [
[
"Regev",
"Oded",
""
],
[
"Toner",
"Ben",
""
]
] |
0708.0828 | Masamune Oguri | Naohisa Inada, Masamune Oguri, Robert H. Becker, Min-Su Shin, Gordon
T. Richards, Joseph F. Hennawi, Richard L. White, Bartosz Pindor, Michael A.
Strauss, Christopher S. Kochanek, David E. Johnston, Michael D. Gregg, Issha
Kayo, Daniel Eisenstein, Patrick B. Hall, Francisco J. Castander, Alejandro
Clocchiatti, Scott F. Anderson, Donald P. Schneider, Donald G. York, Robert
Lupton, Kuenley Chiu, Yozo Kawano, Ryan Scranton, Joshua A. Frieman, Charles
R. Keeton, Tomoki Morokuma, Hans-Walter Rix, Edwin L. Turner, Scott Burles,
Robert J. Brunner, Erin Scott Sheldon, Neta A. Bahcall, Masataka Fukugita | The Sloan Digital Sky Survey Quasar Lens Search. II. Statistical Lens
Sample from the Third Data Release | 15 pages, 4 figures, 5 tables, accepted for publication in AJ; see
http://www-utap.phys.s.u-tokyo.ac.jp/~sdss/sqls/ for supplemental information | Astron.J.135:496-511,2008 | 10.1088/0004-6256/135/2/496 | SLAC-PUB-12706 | astro-ph | null | We report the first results of our systematic search for strongly lensed
quasars using the spectroscopically confirmed quasars in the Sloan Digital Sky
Survey (SDSS). Among 46,420 quasars from the SDSS Data Release 3 (~4188 deg^2),
we select a subsample of 22,683 quasars that are located at redshifts between
0.6 and 2.2 and are brighter than the Galactic extinction corrected i-band
magnitude of 19.1. We identify 220 lens candidates from the quasar subsample,
for which we conduct extensive and systematic follow-up observations in optical
and near-infrared wavebands, in order to construct a complete lensed quasar
sample at image separations between 1'' and 20'' and flux ratios of faint to
bright lensed images larger than 10^{-0.5}. We construct a statistical sample
of 11 lensed quasars. Ten of these are galaxy-scale lenses with small image
separations (~1''-2'') and one is a large separation (15'') system which is
produced by a massive cluster of galaxies, representing the first statistical
sample of lensed quasars including both galaxy- and cluster-scale lenses. The
Data Release 3 spectroscopic quasars contain an additional 11 lensed quasars
outside the statistical sample.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:38:08 GMT"
},
{
"version": "v2",
"created": "Tue, 30 Oct 2007 17:38:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Inada",
"Naohisa",
""
],
[
"Oguri",
"Masamune",
""
],
[
"Becker",
"Robert H.",
""
],
[
"Shin",
"Min-Su",
""
],
[
"Richards",
"Gordon T.",
""
],
[
"Hennawi",
"Joseph F.",
""
],
[
"White",
"Richard L.",
""
],
[
"Pindor",
"Bartosz",
""
],
[
"Strauss",
"Michael A.",
""
],
[
"Kochanek",
"Christopher S.",
""
],
[
"Johnston",
"David E.",
""
],
[
"Gregg",
"Michael D.",
""
],
[
"Kayo",
"Issha",
""
],
[
"Eisenstein",
"Daniel",
""
],
[
"Hall",
"Patrick B.",
""
],
[
"Castander",
"Francisco J.",
""
],
[
"Clocchiatti",
"Alejandro",
""
],
[
"Anderson",
"Scott F.",
""
],
[
"Schneider",
"Donald P.",
""
],
[
"York",
"Donald G.",
""
],
[
"Lupton",
"Robert",
""
],
[
"Chiu",
"Kuenley",
""
],
[
"Kawano",
"Yozo",
""
],
[
"Scranton",
"Ryan",
""
],
[
"Frieman",
"Joshua A.",
""
],
[
"Keeton",
"Charles R.",
""
],
[
"Morokuma",
"Tomoki",
""
],
[
"Rix",
"Hans-Walter",
""
],
[
"Turner",
"Edwin L.",
""
],
[
"Burles",
"Scott",
""
],
[
"Brunner",
"Robert J.",
""
],
[
"Sheldon",
"Erin Scott",
""
],
[
"Bahcall",
"Neta A.",
""
],
[
"Fukugita",
"Masataka",
""
]
] |
0708.0829 | Fotis P. Gavriil | Fotis P. Gavriil (1,2), Tod E. Strohmayer (2), Jean H. Swank (2),
Craig B. Markwardt (2,4) | Discovery of 442-Hz Pulsations from an X-ray Source in the Globular
Cluster NGC 6440 | 4 pages, 3 figures, submitted to ApJ Letters | null | 10.1086/523758 | null | astro-ph | null | We report on the serendipitous discovery of a 442-Hz pulsar during a Rossi
X-ray Timing Explorer (RXTE) observation of the globular cluster NGC 6440. The
oscillation is detected following a burst-like event which was decaying at the
beginning of the observation. The time scale of the decay suggests we may have
seen the tail-end of a long-duration burst. Low-mass X-ray binaries (LMXBs) are
known to emit thermonuclear X-ray bursts that are sometimes modulated by the
spin frequency of the star, the so called burst oscillations. The pulsations
reported here are peculiar if interpreted as canonical burst oscillations. In
particular, the pulse train lasted for ~500 s, much longer than in standard
burst oscillations. The signal was highly coherent and drifted down by ~2x10^-3
Hz, much smaller than the ~Hz drifts typically observed during normal bursts.
The pulsations are reminiscent of those observed during the much more energetic
``superbursts'', however, the temporal profile and the energetics of the burst
suggest that it was not the tail end nor the precursor feature of a superburst.
It is possible that we caught the tail end of an outburst from a new
`intermittent'' accreting X-ray millisecond pulsar, a phenomenon which until
now has only been seen in HETE J1900.1$-$2455 (Galloway et al. 2007). We note
that (Kaaret et al. 2003) reported the discovery of a 409.7 Hz burst
oscillation from SAX J1748.9-2021, also located in NGC 6440. However, Chandra
X-ray
Observatory imaging indicates it contains several point-like X-ray sources,
thus the 442 Hz object is likely a different source.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:03:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gavriil",
"Fotis P.",
""
],
[
"Strohmayer",
"Tod E.",
""
],
[
"Swank",
"Jean H.",
""
],
[
"Markwardt",
"Craig B.",
""
]
] |
0708.0830 | D. F. Mota | D. F. Mota, J. R. Kristiansen, T. Koivisto, N. E. Groeneboom | Constraining Dark Energy Anisotropic Stress | 9 pages, 12 figures. Accepted for publication at Mon. Not. Roy.
Astro. Soc | Mon.Not.Roy.Astron.Soc.382:793-800,2007 | 10.1111/j.1365-2966.2007.12413.x | null | astro-ph | null | We investigate the possibility of using cosmological observations to probe
and constrain an imperfect dark energy fluid. We consider a general
parameterization of the dark energy component accounting for an equation of
state, speed of sound and viscosity. We use present and future data from the
cosmic microwave background radiation (CMB), large scale structures and
supernovae type Ia. We find that both the speed of sound and viscosity
parameters are difficult to nail down with the present cosmological data. Also,
we argue that it will be hard to improve the constraints significantly with
future CMB data sets. The implication is that a perfect fluid description might
ultimately turn out to be a phenomenologically sufficient description of all
the observational consequences of dark energy. The fundamental lesson is
however that even then one cannot exclude, by appealing to observational
evidence alone, the possibility of imperfectness in dark energy.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:23:51 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 10:18:05 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Mota",
"D. F.",
""
],
[
"Kristiansen",
"J. R.",
""
],
[
"Koivisto",
"T.",
""
],
[
"Groeneboom",
"N. E.",
""
]
] |
0708.0831 | Brian J. Smith | Brian J. Smith and M. G. Raymer | Photon wave functions, wave-packet quantization of light, and coherence
theory | 34 pages, 3 figures, minor corrections | NewJ.Phys.9:414,2007 | 10.1088/1367-2630/9/11/414 | null | quant-ph | null | The monochromatic Dirac and polychromatic Titulaer-Glauber quantized field
theories (QFTs) of electromagnetism are derived from a photon-energy wave
function in much the same way that one derives QFT for electrons, that is, by
quantization of a single-particle wave function. The photon wave function and
its equation of motion are established from the Einstein energy-momentum-mass
relation, assuming a local energy density. This yields a theory of photon wave
mechanics (PWM). The proper Lorentz-invariant single-photon scalar product is
found to be non-local in coordinate space, and is shown to correspond to
orthogonalization of the Titulaer-Glauber wave-packet modes. The wave functions
of PWM and mode functions of QFT are shown to be equivalent, evolving via
identical equations of motion, and completely describe photonic states. We
generalize PWM to two or more photons, and show how to switch between the PWM
and QFT viewpoints. The second-order coherence tensors of classical coherence
theory and the two-photon wave functions are shown to propagate equivalently.
We give examples of beam-like states, which can be used as photon wave
functions in PWM, or modes in QFT. We propose a practical mode converter based
on spectral filtering to convert between wave packets and their corresponding
biorthogonal dual wave packets.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:06:46 GMT"
},
{
"version": "v2",
"created": "Sun, 9 Dec 2007 11:47:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Smith",
"Brian J.",
""
],
[
"Raymer",
"M. G.",
""
]
] |
0708.0832 | Sarah Robinson | Sarah E. Robinson (1), Gregory Laughlin (1), Steven S. Vogt (1), Debra
A. Fischer (2), R. Paul Butler (3), Geoffrey W. Marcy (4), Gregory W. Henry
(5), Peter Driscoll (2,6), Genya Takeda (7), John A. Johnson (4) ((1)
UCO/Lick Observatory, (2) San Francisco State University, (3) Carnegie DTM,
(4) University of California, Berkeley, (5) Tennessee State University, (6)
Johns Hopkins University, (7) Northwestern University) | Two Jovian-Mass Planets in Earthlike Orbits | 32 pages, including 11 figures and 5 tables. Accepted by ApJ | null | 10.1086/522106 | null | astro-ph | null | We report the discovery of two new planets: a 1.94 M_Jup planet in a 1.8-year
orbit of HD 5319, and a 2.51 M_Jup planet in a 1.1-year orbit of HD 75898. The
measured eccentricities are 0.12 for HD 5319 b and 0.10 for HD 75898 b, and
Markov Chain Monte Carlo simulations based on derived orbital parameters
indicate that the radial velocities of both stars are consistent with circular
planet orbits. With low eccentricity and 1 < a < 2 AU, our new planets have
orbits similar to terrestrial planets in the solar system. The radial velocity
residuals of both stars have significant trends, likely arising from substellar
or low-mass stellar companions.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:11:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Robinson",
"Sarah E.",
""
],
[
"Laughlin",
"Gregory",
""
],
[
"Vogt",
"Steven S.",
""
],
[
"Fischer",
"Debra A.",
""
],
[
"Butler",
"R. Paul",
""
],
[
"Marcy",
"Geoffrey W.",
""
],
[
"Henry",
"Gregory W.",
""
],
[
"Driscoll",
"Peter",
""
],
[
"Takeda",
"Genya",
""
],
[
"Johnson",
"John A.",
""
]
] |
0708.0833 | Emily Levesque | Emily M. Levesque and Lisa J. Kewley | The Host Galaxy of GRB 060505: Host ISM Properties | 7 pages, two figures; accepted for publication in ApJL | null | 10.1086/522117 | null | astro-ph | null | We investigate the ISM environment of GRB 060505. Using optical emission-line
diagnostic ratios, we compare the ISM properties of the GRB 060505 host region
with the hosts of unambiguous long- and short-duration GRBs. We show that the
metallicity, ionization state, and star formation rate of the GRB 060505
environment are more consistent with short-duration GRBs than with
long-duration GRBs. We compare the metallicity and star formation rates of the
GRB 060505 region with four other star-forming regions within the GRB 060505
host galaxy. We find no significant change in metallicity or star formation
rate between the GRB 060505 region and the other four host regions. Our results
are consistent with a compact-object-merger progenitor for GRB 060505.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:11:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Levesque",
"Emily M.",
""
],
[
"Kewley",
"Lisa J.",
""
]
] |
0708.0834 | Georgi Mandushev | Georgi Mandushev, Francis T. O'Donovan, David Charbonneau, Guillermo
Torres, David W. Latham, G\'asp\'ar \'A. Bakos, Edward W. Dunham, Alessandro
Sozzetti, Jos\'e M. Fern\'andez, Gilbert A. Esquerdo, Mark E. Everett,
Timothy M. Brown, Markus Rabus, Juan A. Belmonte, Lynne A. Hillenbrand | TrES-4: A Transiting Hot Jupiter of Very Low Density | null | null | 10.1086/522115 | null | astro-ph | null | We report the discovery of TrES-4, a hot Jupiter that transits the star GSC
02620-00648 every 3.55 days. From high-resolution spectroscopy of the star we
estimate a stellar effective temperature of Teff = 6100 +/- 150 K, and from
high-precision z and B photometry of the transit we constrain the ratio of the
semi-major axis and the stellar radius to be a/R = 6.03 +/- 0.13. We compare
these values to model stellar isochrones to constrain the stellar mass to be M*
= 1.22 +/- 0.17 Msun. Based on this estimate and the photometric time series,
we constrain the stellar radius to be R* = 1.738 +/- 0.092 Rsun and the planet
radius to be Rp = 1.674 +/- 0.094 RJup. We model our radial-velocity data
assuming a circular orbit and find a planetary mass of 0.84 +/- 0.10 MJup. Our
radial-velocity observations rule out line-bisector variations that would
indicate a specious detection resulting from a blend of an eclipsing binary
system. TrES-4 has the largest radius and lowest density of any of the known
transiting planets. It presents a challenge to current models of the physical
structure of hot Jupiters, and indicates that the diversity of physical
properties amongst the members of this class of exoplanets has yet to be fully
explored.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:12:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mandushev",
"Georgi",
""
],
[
"O'Donovan",
"Francis T.",
""
],
[
"Charbonneau",
"David",
""
],
[
"Torres",
"Guillermo",
""
],
[
"Latham",
"David W.",
""
],
[
"Bakos",
"Gáspár Á.",
""
],
[
"Dunham",
"Edward W.",
""
],
[
"Sozzetti",
"Alessandro",
""
],
[
"Fernández",
"José M.",
""
],
[
"Esquerdo",
"Gilbert A.",
""
],
[
"Everett",
"Mark E.",
""
],
[
"Brown",
"Timothy M.",
""
],
[
"Rabus",
"Markus",
""
],
[
"Belmonte",
"Juan A.",
""
],
[
"Hillenbrand",
"Lynne A.",
""
]
] |
0708.0835 | Joshua Younger | Joshua D. Younger, Jia-Sheng Huang, Giovanni G. Fazio, Thomas J. Cox,
Kamson Lai, Philip F. Hopkins, Lars Hernquist (Harvard/CfA), Casey J.
Papovich (Steward Observatory), Luc Simard (HIA/NRC), Lihwai Lin (UCO/Lick,
National Taiwan University), Yi-Wen Cheng (National Central University),
Haojin Yan (Carnegie Observatories), Dusan Keres (Harvard/CfA), and Alice E.
Shapley (Princeton) | Rest-Frame Ultraviolet to Near Infrared Observations of an Interacting
Lyman Break Galaxy at z = 4.42 | 7 pages, 7 figures, accepted for publication in ApJ | null | 10.1086/522773 | null | astro-ph | null | We present the rest-frame ultraviolet through near infrared spectral energy
distribution for an interacting Lyman break galaxy at a redshift z=4.42, the
highest redshift merging system known with clearly resolved tidal features. The
two objects in this system - HDF-G4 and its previously unidentified companion -
are both B_{435} band dropouts, have similar V_{606}-i_{775} and
i_{775}-z_{850} colors, and are separated by 1", which at z=4.42 corresponds to
7 kpc projected nuclear separation; all indicative of an interacting system.
Fits to stellar population models indicate a stellar mass of M_\star =
2.6\times 10^{10} M_\odot, age of \tau_\star = 720 My, and exponential star
formation history with an e-folding time \tau_0 = 440 My. Using these derived
stellar populations as constraints, we model the HDF-G4 system using
hydrodynamical simulations, and find that it will likely evolve into a quasar
by z\sim3.5, and a quiescent, compact spheroid by z\sim 2.5 similar to those
observed at z > 2. And, the existence of such an object supports galaxy
formation models in which major mergers drive the high redshift buildup of
spheroids and black holes.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 01:18:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Younger",
"Joshua D.",
"",
"Harvard/CfA"
],
[
"Huang",
"Jia-Sheng",
"",
"Harvard/CfA"
],
[
"Fazio",
"Giovanni G.",
"",
"Harvard/CfA"
],
[
"Cox",
"Thomas J.",
"",
"Harvard/CfA"
],
[
"Lai",
"Kamson",
"",
"Harvard/CfA"
],
[
"Hopkins",
"Philip F.",
"",
"Harvard/CfA"
],
[
"Hernquist",
"Lars",
"",
"Harvard/CfA"
],
[
"Papovich",
"Casey J.",
"",
"Steward Observatory"
],
[
"Simard",
"Luc",
"",
"HIA/NRC"
],
[
"Lin",
"Lihwai",
"",
"UCO/Lick,\n National Taiwan University"
],
[
"Cheng",
"Yi-Wen",
"",
"National Central University"
],
[
"Yan",
"Haojin",
"",
"Carnegie Observatories"
],
[
"Keres",
"Dusan",
"",
"Harvard/CfA"
],
[
"Shapley",
"Alice E.",
"",
"Princeton"
]
] |
0708.0836 | Frank Ndili Ph.D. | F. N. Ndili | Can experiments distinguish between Radiative Electroweak Symmetry
breaking and Conventional breaking? | 22 pages, 6 figures | null | null | null | hep-ph | null | We present a comparative study of radiative electroweak symmetry breaking and
conventional standard model breaking, and pose the question whether experiments
can distinguish one breaking mode from the other. The importance of the problem
lies in the fact that the two breaking modes have very different physical
interpretations concerning the mechanism of spontaneous electroweak symmetry
breaking and the origin of mass.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:22:49 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Ndili",
"F. N.",
""
]
] |
0708.0837 | Leonid Levitov | A. V. Shytov, M. I. Katsnelson, L. S. Levitov | Atomic Collapse and Quasi-Rydberg States in Graphene | 5 pages, 4 figures | Phys. Rev. Lett. 99, 246802 (2007) | 10.1103/PhysRevLett.99.246802 | null | cond-mat.mes-hall | null | Charge impurities in graphene can host an infinite family of Rydberg-like
resonance states of massless Dirac particles. These states, appearing for
supercritical charge, are described by Bohr-Sommerfeld quantization of
collapsing classical trajectories that descend on point charge, in analogy to
Rydberg states relation with planetary orbits. We argue that divalent and
trivalent charge impurities in graphene is an ideal system for realization of
this atomic collapse regime. Strong coupling of these states to the Dirac
continuum via Klein tunneling leads to striking resonance effects with direct
signatures in transport, local properties and enhancement of the Kondo effect.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:46:37 GMT"
}
] | 2007-12-15T00:00:00 | [
[
"Shytov",
"A. V.",
""
],
[
"Katsnelson",
"M. I.",
""
],
[
"Levitov",
"L. S.",
""
]
] |
0708.0838 | Klaas Pieter Hart | Alan Dow, Klaas Pieter Hart | A separable non-remainder of H | Rewrite after referee's comments | Proc. Amer. Math. Soc. 136 (2008), 4057-4063 | 10.1090/S0002-9939-08-09357-X | null | math.GN math.LO | null | We prove that there is a compact separable continuum that (consistently) is
not a remainder of the real line.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:38:55 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 20:55:57 GMT"
}
] | 2011-09-09T00:00:00 | [
[
"Dow",
"Alan",
""
],
[
"Hart",
"Klaas Pieter",
""
]
] |
0708.0839 | Jonathan Harrison | J. M. Harrison, U. Smilansky, B. Winn | Quantum graphs where back-scattering is prohibited | 15 pages | null | 10.1088/1751-8113/40/47/010 | null | math-ph math.MP | null | We describe a new class of scattering matrices for quantum graphs in which
back-scattering is prohibited. We discuss some properties of quantum graphs
with these scattering matrices and explain the advantages and interest in their
study. We also provide two methods to build the vertex scattering matrices
needed for their construction.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:42:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Harrison",
"J. M.",
""
],
[
"Smilansky",
"U.",
""
],
[
"Winn",
"B.",
""
]
] |
0708.0840 | Luciano da Fontoura Costa | Luis Enrique Correa da Rocha and Luciano da Fontoura Costa | Multiple complex networks emerging from individual interactions | 26 pages, 14 figures. A working manuscript, comments welcomed | null | null | null | physics.bio-ph physics.comp-ph | null | Systems composed of distinct complex networks are present in many real-world
environments, from society to ecological systems. In the present paper, we
propose a network model obtained as a consequence of interactions between two
species (e.g. predator and prey). Fields are produced and sensed by the
individuals, defining spatio-temporal patterns which are strongly affected by
the attraction intensity between individuals from the same species. The
dynamical evolution of the system, including the change of individuals between
different clusters, is investigated by building two complex networks having the
individuals as nodes. In the first network, the edge weight is given by the
Euclidean distance between every two individuals and, in the case of the second
network, by the amount of time two individuals stay close one another. A third
network is obtained from the two previous networks whose nodes correspond to
the spatially congruent groups. The system evolves to an organized state where
Gaussian and scale-free-like strength distributions emerge, respectively, in
the predator and prey networks. Such a different connectivity is mainly a
consequence of preys elimination. Some configurations favor the survival of
preys or higher efficiency of predator activity.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 21:12:56 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"da Rocha",
"Luis Enrique Correa",
""
],
[
"Costa",
"Luciano da Fontoura",
""
]
] |
0708.0841 | Matthew Kennedy | Matthew Kennedy | Triangularization of a Jordan Algebra of Schatten Operators | null | Proc. Amer. Math. Soc. 136 (2008), no. 7, 2521-2527 | null | null | math.OA | null | We show that a Jordan algebra of compact quasinilpotent operators which
contains a nonzero trace class operator has a common invariant subspace. As a
consequence of this result, we obtain that a Jordan algebra of quasinilpotent
Schatten operators is simultaneously triangularizable.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:52:20 GMT"
}
] | 2010-01-20T00:00:00 | [
[
"Kennedy",
"Matthew",
""
]
] |
0708.0842 | William Gillam | W. D. Gillam | The Crepant Resolution Conjecture for 3-dimensional flags modulo an
involution | 23 pages | null | null | null | math.AG | null | After fixing a non-degenerate bilinear form on a vector space V we define an
involution of the manifold of flags F in V by taking a flag to its orthogonal
complement. When V is of dimension 3 we check that the Crepant Resolution
Conjecture of J. Bryan and T. Graber holds: the genus zero (orbifold)
Gromov-Witten potential function of [F / Z_2] agrees (up to unstable terms)
with the genus zero Gromov-Witten potential function of a crepant resolution Y
of the quotient scheme F / Z_2, after setting a quantum parameter to -1, making
a linear change of variables, and analytically continuing coefficients. The
crepant resolution Y (a hypersurface in the Hilbert scheme Hilb^2 P^2) is the
projectivization of a novel rank 2 vector bundle over P^2.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 20:55:12 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Gillam",
"W. D.",
""
]
] |
0708.0843 | Jo\~ao Milton Pereira Jr. | J. Milton Pereira Jr., F. M. Peeters, and P. Vasilopoulos | Landau levels and oscillator strength in a biased bilayer of graphene | To appear in Phys. Rev. B | null | null | null | cond-mat.mes-hall | null | We obtain analytical expressions for the eigenstates and the Landau level
spectrum of biased graphene bilayers in a magnetic field. The calculations are
performed in the context of a four-band continuum model and generalize previous
approximate results. Solutions are presented for the spectrum as a function of
interlayer coupling, the potential difference between the layers and the
magnetic field. The explicit expressions allow us to calculate the oscillator
strength and the selection rules for electric dipole transitions between the
Landau states. Some transitions are significantly shifted in energy relative to
those in an unbiased bialyer and exhibit a very different magnetic field
dependence.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 21:00:46 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Pereira",
"J. Milton",
"Jr."
],
[
"Peeters",
"F. M.",
""
],
[
"Vasilopoulos",
"P.",
""
]
] |
0708.0844 | Rebecca Centeno | R. Centeno, H. Socas-Navarro, B. Lites, M. Kubo, Z. Frank, R. Shine,
T. Tarbell, A. Title, K. Ichimoto, S. Tsuneta, Y. Katsukawa, Y. Suematsu, T.
Shimizu, S. Nagata | Emergence of Small-Scale Magnetic Loops in the Quiet Sun Internetwork | 9 pages (referee format), 3 figures. Accepted for publication in ApJ
Letters | null | 10.1086/521726 | null | astro-ph | null | We study the emergence of magnetic flux at very small spatial scales (less
than 2 arcsec) in the quiet Sun internetwork. To this aim, a time series of
spectropolarimetric maps was taken at disk center using the instrument SP/SOT
on board Hinode. The LTE inversion of the full Stokes vector measured in the Fe
I 6301 and 6302 A lines allows us to retrieve the magnetic flux and topology in
the region of study. In the example presented here, the magnetic flux emerges
within a granular structure. The horizontal magnetic field appears prior to any
significant amount of vertical field. As time goes on, the traces of the
horizontal field disappear while the the vertical dipoles drift -carried by the
plasma motions- towards the surrounding intergranular lanes. These events take
place within typical granulation timescales.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 21:15:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Centeno",
"R.",
""
],
[
"Socas-Navarro",
"H.",
""
],
[
"Lites",
"B.",
""
],
[
"Kubo",
"M.",
""
],
[
"Frank",
"Z.",
""
],
[
"Shine",
"R.",
""
],
[
"Tarbell",
"T.",
""
],
[
"Title",
"A.",
""
],
[
"Ichimoto",
"K.",
""
],
[
"Tsuneta",
"S.",
""
],
[
"Katsukawa",
"Y.",
""
],
[
"Suematsu",
"Y.",
""
],
[
"Shimizu",
"T.",
""
],
[
"Nagata",
"S.",
""
]
] |
0708.0845 | Toshinobu Takagi | T. Takagi, A. M. J. Mortier, K. Shimasaku, K. Coppin, A. Pope, R. J.
Ivison, H. Hanami, S. Serjeant, D. L. Clements, R. S. Priddey, J. S. Dunlop,
T. Takata, I. Aretxaga, S. C. Chapman, S. A. Eales, D. Farrah, G. L. Granato,
M. Halpern, D. H. Hughes, E. van Kampen, D. Scott, K. Sekiguchi, I. Smail, M.
Vaccari | The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- V. Submillimetre
properties of near-infrared--selected galaxies in the Subaru/XMM--Newton deep
field | 20 pages, 11 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12302.x | null | astro-ph | null | We have studied the submillimetre (submm) properties of the following classes
of near-infrared (NIR)-selected massive galaxies at high redshifts:
BzK-selected star-forming galaxies (BzKs); distant red galaxies (DRGs); and
extremely red objects (EROs). We used the SCUBA HAlf Degree Extragalactic
Survey (SHADES), the largest uniform submm survey to date. Partial overlap of
SIRIUS/NIR images and SHADES in SXDF has allowed us to identify 4 submm-bright
NIR-selected galaxies, which are detected in the mid-infrared, 24 micron, and
the radio, 1.4 GHz. We find that all of our submm-bright NIR-selected galaxies
satisfy the BzK selection criteria, except for one galaxy whose B-z and z-K
colours are however close to the BzK colour boundary. Two of the submm-bright
NIR-selected galaxies satisfy all of the selection criteria we considered, i.e.
they belong to the BzK-DRG-ERO overlapping population, or `extremely red' BzKs.
Although these extremely red BzKs are rare (0.25 arcmin^{-2}), up to 20 % of
this population could be submm galaxies. This fraction is significantly higher
than that found for other galaxy populations studied here. Via a stacking
analysis, we have detected the 850 micron flux of submm-faint BzKs and EROs in
our SCUBA maps. While the contribution of z~2 BzKs to the submm background is
about 10--15 % and similar to that from EROs typically at z~1, BzKs have a
higher fraction (~30 %) of submm flux in resolved sources compared with EROs
and submm sources as a whole. From the SED fitting analysis for both
submm-bright and submm-faint BzKs, we found no clear signature that
submm-bright BzKs are experiencing a specifically luminous evolutionary phase,
compared with submm-faint BzKs. An alternative explanation might be that
submm-bright BzKs are more massive than submm-faint ones.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 21:20:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Takagi",
"T.",
""
],
[
"Mortier",
"A. M. J.",
""
],
[
"Shimasaku",
"K.",
""
],
[
"Coppin",
"K.",
""
],
[
"Pope",
"A.",
""
],
[
"Ivison",
"R. J.",
""
],
[
"Hanami",
"H.",
""
],
[
"Serjeant",
"S.",
""
],
[
"Clements",
"D. L.",
""
],
[
"Priddey",
"R. S.",
""
],
[
"Dunlop",
"J. S.",
""
],
[
"Takata",
"T.",
""
],
[
"Aretxaga",
"I.",
""
],
[
"Chapman",
"S. C.",
""
],
[
"Eales",
"S. A.",
""
],
[
"Farrah",
"D.",
""
],
[
"Granato",
"G. L.",
""
],
[
"Halpern",
"M.",
""
],
[
"Hughes",
"D. H.",
""
],
[
"van Kampen",
"E.",
""
],
[
"Scott",
"D.",
""
],
[
"Sekiguchi",
"K.",
""
],
[
"Smail",
"I.",
""
],
[
"Vaccari",
"M.",
""
]
] |
0708.0846 | Amir Leshem | Amir Leshem and Ephi Zehavi | Cooperative game theory and the Gaussian interference channel | null | null | null | null | cs.IT cs.GT math.IT | null | In this paper we discuss the use of cooperative game theory for analyzing
interference channels. We extend our previous work, to games with N players as
well as frequency selective channels and joint TDM/FDM strategies.
We show that the Nash bargaining solution can be computed using convex
optimization techniques. We also show that the same results are applicable to
interference channels where only statistical knowledge of the channel is
available. Moreover, for the special case of two players $2\times K$ frequency
selective channel (with K frequency bins) we provide an $O(K \log_2 K)$
complexity algorithm for computing the Nash bargaining solution under mask
constraint and using joint FDM/TDM strategies. Simulation results are also
provided.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 21:47:10 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Leshem",
"Amir",
""
],
[
"Zehavi",
"Ephi",
""
]
] |
0708.0847 | Andrew Pontzen | Andrew Pontzen, Paul Hewett, Robert Carswell, Vivienne Wild | Direct Observational Test Rules Out Small MgII Absorbers | Accepted for publication in MNRAS Letters. 5 pages, 2 figures | null | 10.1111/j.1745-3933.2007.00377.x | null | astro-ph | null | Recent observations suggest the incidence of strong intervening MgII
absorption systems along the line-of-sight to gamma ray burst (GRB) afterglows
is significantly higher than expected from analogous quasar sightlines. One
possible explanation is a geometric effect, arising because MgII absorbers only
partially cover the quasar continuum regions, in which case MgII absorbers must
be considerably smaller than previous estimates. We investigate the production
of abnormal absorption profiles by partial coverage and conclude that the lack
of any known anomalous profiles in observed systems, whilst constraining,
cannot on its own rule out patchy MgII absorbers.
In a separate test, we look for differences in the distribution function of
MgII equivalent widths over quasar continuum regions and CIII] emission lines.
We show that these anomalies should be observable in any scenario where MgII
absorbers are very small, but they are not present in the data. We conclude
that models invoking small MgII cloudlets to explain the excess of absorbers
seen towards GRBs are ruled out.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:59:53 GMT"
}
] | 2007-09-18T00:00:00 | [
[
"Pontzen",
"Andrew",
""
],
[
"Hewett",
"Paul",
""
],
[
"Carswell",
"Robert",
""
],
[
"Wild",
"Vivienne",
""
]
] |
0708.0848 | Michael Marino | M.G. Marino, J.A. Detwiler, R. Henning, R.A. Johnson, A.G. Schubert,
J.F. Wilkerson | Validation of spallation neutron production and propagation within
Geant4 | 12 pages, 6 figures, 5 tables, submitted to NIM A. 6 Aug 2007 | Nucl.Instrum.Meth.A582:611-620,2007 | 10.1016/j.nima.2007.08.170 | null | nucl-ex | null | Using simulations to understand backgrounds from muon-induced neutrons is
important in designing next-generation low-background underground experiments.
Validation of relevant physics within the Geant4 simulation package has been
completed by comparing to data from two recent experiments. Verification
focused on the production and propagation of neutrons at energies important to
underground experiments. Discrepancies were observed between experimental data
and the simulation. Techniques were explored to correct for these
discrepancies.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 21:34:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Marino",
"M. G.",
""
],
[
"Detwiler",
"J. A.",
""
],
[
"Henning",
"R.",
""
],
[
"Johnson",
"R. A.",
""
],
[
"Schubert",
"A. G.",
""
],
[
"Wilkerson",
"J. F.",
""
]
] |
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