id
stringlengths 9
16
| submitter
stringlengths 1
64
⌀ | authors
stringlengths 3
36.7k
| title
stringlengths 1
382
| comments
stringlengths 1
1.15k
⌀ | journal-ref
stringlengths 1
557
⌀ | doi
stringlengths 7
153
⌀ | report-no
stringlengths 1
479
⌀ | categories
stringlengths 5
125
| license
stringclasses 9
values | abstract
stringlengths 6
6.09k
| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.1498 | Elisabetta Cavazzuti | S. Turriziani, E. Cavazzuti, P. Giommi | ROXA: a new multi-frequency selected large sample of blazars with SDSS
and 2dF optical spectroscopy | 19 pages, 3 figure, 2 tables | Astron.Astrophys.472:699-704,2007 | 10.1051/0004-6361:20077114 | null | astro-ph | null | Context. Although Blazars are a small fraction of the overall AGN population
they are expected to be the dominant population of extragalactic sources in the
hard X-ray and gamma-ray bands and have been shown to be the largest
contaminant of CMB fluctuation maps. So far the number of known blazars is of
the order of several hundreds, but the forthcoming AGILE, GLAST and Planck
space observatories will detect several thousand of objects of this type. Aims.
In preparation for these missions it is necessary to identify new samples of
blazars to study their multi-frequency characteristics and statistical
properties. Methods. We compiled a sample of objects with blazar-like
properties via a cross-correlation between large radio (NVSS, ATCAPMN) and X-
ray surveys (RASS) using the SDSS-DR4 and 2dF survey data to spectroscopically
identify our candidates and test the validity of the selection method. Results.
We present the Radio - Optical - X-ray catalog built at ASDC (ROXA), a list of
816 objects among which 510 are confirmed blazars. Only 19% of the candidates
turned out to be certainly non-blazars demonstrating the high efficiency of our
selection method. Conclusions. Our catalog includes 173 new blazar
identifications, or about 10% of all presently known blazars. The relatively
high flux threshold in the X-ray energy band (given by the RASS survey)
preferentially selects objects with high fx / fr ratio leading to the discovery
of new High Energy Peaked BL Lac (HBLs). Our catalog therefore includes many
new potential targets for GeV-TeV observations.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 15:32:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Turriziani",
"S.",
""
],
[
"Cavazzuti",
"E.",
""
],
[
"Giommi",
"P.",
""
]
] |
0705.1499 | Rohini Godbole Professor | Debajyoti Choudhury, Rohini M. Godbole, Ritesh K. Singh and Kshitij
Wagh | Top production at the Tevatron/LHC and nonstandard, strongly interacting
spin one particles | 15 pages, uses LaTex, six figures. To appear in Physics Letters B.
Reference to and discussion on the forward-backward asymmetry expected even
in the SM, added | Phys.Lett.B657:69-76,2007 | 10.1016/j.physletb.2007.09.057 | IISc-CHEP/06/07, LAPTH-1183/2007 | hep-ph | null | In this note, we consider possible constraints from $t \bar t$ production on
the gauge bosons of theories with an extended strong interaction sector such as
axigluons or flavour universal colorons. Such constraints are found to be
competitive with those obtained from the dijet data. The current $t \bar t$
data from the Tevatron rule out axigluon masses ($m_A$) up to 900 GeV and 850
GeV at 2 $\sigma$ and 4 $\sigma$ levels respectively. For the case of flavour
universal colorons the data rule out a mass ($m_C$) below 800 GeV (780 GeV) at
the $2 (4) \sigma $ level and also the mass range between 900 GeV to 2.1 TeV at
2 $\sigma$ level, for $\cot \xi = 1$, where $\xi$ is the mixing angle. For
$\cot \xi =2$ on the other hand, the excluded range is $m_C \lsim 950 (920)$
GeV and $m_C \gsim 1.02 (1.15 \lsim m_C \lsim 1.8)$ TeV at $2 \sigma$ ($4
\sigma $) level. We point out that for higher axigluon/coloron masses, even for
the dijet channel, the limits on the coloron mass, for $\cot \xi = 1$, may be
different than those for the axigluon. We also compute the expected
forward-backward asymmetry for the case of the axigluons which would allow it
to be discriminated against the SM as also the colorons. We further find that
at the LHC, the signal should be visible in the $t \bar t$ invariant mass
spectrum for a wide range of axigluon and coloron masses that are still
allowed. We point out how top polarisation may be used to further discriminate
the axigluon and coloron case from the SM as well as from each other.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 15:34:13 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 14:45:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Godbole",
"Rohini M.",
""
],
[
"Singh",
"Ritesh K.",
""
],
[
"Wagh",
"Kshitij",
""
]
] |
0705.1500 | Christopher Thomas | C. E. Thomas | Composition of the Pseudoscalar Eta and Eta' Mesons | 34 pages, 11 figures. v2: version published in JHEP, added
substantial section on B and D meson electroweak decays, added comment on
psi' to eta(')/eta_c gamma, Figs 5 and 6 split and made clearer, added
references, other minor revisions which don't change conclusions | JHEP 0710:026,2007 | 10.1088/1126-6708/2007/10/026 | OUTP-07-06P | hep-ph hep-ex | null | The composition of the eta and eta' mesons has long been a source of
discussion and is of current interest with new experimental results appearing.
We investigate what can be learnt from a number of different processes: V to P
gamma and P to V gamma (V and P are light vector and pseudoscalar mesons
respectively), P to gamma gamma, J/psi,psi' to P gamma, J/psi,psi' to P V, and
chi_{c0,2} to PP. These constrain the eta-eta' mixing angle to a consistent
value, phi approx 42 degrees; we find that the c cbar components are lesssim 5%
in amplitude. We also find that, while the data hint at a small gluonic
component in the eta', the conclusions depend sensitively on unknown form
factors associated with exclusive dynamics. In addition, we predict BR(psi' to
eta' gamma) approx 1 10^{-5} and BR(chi_{c0} to eta eta') approx 2 10^{-5} - 1
10^{-4}. We provide a method to test the mixing using chi_{c2} to eta eta, eta'
eta', and eta eta' modes and make some general observations on chi_{c0,2}
decays. We also survey the semileptonic and hadronic decays of bottom and
charmed mesons and find some modes where the mixing angle can be extracted
cleanly with the current experimental data, some where more data will allow
this, and some where a more detailed knowledge of the different amplitudes is
required.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 17:03:45 GMT"
},
{
"version": "v2",
"created": "Mon, 15 Oct 2007 13:54:36 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Thomas",
"C. E.",
""
]
] |
0705.1501 | Elena Balandina | E. V. Balandina, E. M. Leikin, N. P. Yudin | Model independent Breit-Wigner parameters of nucleon resonances
S11(1535), S11(1650) and P11(1710) | 3 pages, 2 tables | null | null | null | nucl-th | null | Estimates of Breit-Wigner parameters of nucleon resonances were obtained by
phenomenological analysis of eta meson photoproduction on protons performed
completely by statistical procedures without appealing to theoretical models
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 15:48:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Balandina",
"E. V.",
""
],
[
"Leikin",
"E. M.",
""
],
[
"Yudin",
"N. P.",
""
]
] |
0705.1502 | Yvan Castin | Ludovic Pricoupenko (LPTMC), Yvan Castin (LKB - Lhomond) | Three fermions in a box at the unitary limit: universality in a lattice
model | 6 pages | Journal of Physics A General Physics (2007) 12863 | 10.1088/1751-8113/40/43/003 | null | cond-mat.other | null | We consider three fermions with two spin components interacting on a lattice
model with an infinite scattering length. Low lying eigenenergies in a cubic
box with periodic boundary conditions, and for a zero total momentum, are
calculated numerically for decreasing values of the lattice period. The results
are compared to the predictions of the zero range Bethe-Peierls model in
continuous space, where the interaction is replaced by contact conditions. The
numerical computation, combined with analytical arguments, shows the absence of
negative energy solution, and a rapid convergence of the lattice model towards
the Bethe-Peierls model for a vanishing lattice period. This establishes for
this system the universality of the zero interaction range limit.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 15:48:45 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Sep 2007 19:06:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pricoupenko",
"Ludovic",
"",
"LPTMC"
],
[
"Castin",
"Yvan",
"",
"LKB - Lhomond"
]
] |
0705.1503 | Sacha Davidson | Sacha Davidson, Julia Garayoa, Federica Palorini, Nuria Rius | Insensitivity of flavoured leptogenesis to low energy CP violation | 4 pages, 1 figure; version accepted for publication, added
explanations, notation clarified | Phys.Rev.Lett.99:161801,2007 | 10.1103/PhysRevLett.99.161801 | null | hep-ph | null | If the baryon asymmetry of the Universe is produced by leptogenesis, CP
violation is required in the lepton sector. In the seesaw extension of the
Standard Model with three hierarchical right-handed neutrinos, we show that the
baryon asymmetry is insensitive to the PMNS phases: thermal leptogenesis can
work for any value of the observable phases. This result was well-known when
there are no flavour effects in leptogenesis; we show that it remains true when
flavour effects are included.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:05:45 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 12:55:20 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Oct 2007 10:18:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Davidson",
"Sacha",
""
],
[
"Garayoa",
"Julia",
""
],
[
"Palorini",
"Federica",
""
],
[
"Rius",
"Nuria",
""
]
] |
0705.1504 | Jeff Forshaw | Jeff Forshaw and Malin Sjodahl | Soft gluons in Higgs plus two jet production | 15 pages and 5 figures | JHEP 0709:119,2007 | 10.1088/1126-6708/2007/09/119 | null | hep-ph | null | We investigate the effects of an all order QCD resummation of soft gluon
emissions for Higgs boson production in association with two hard jets. We
consider both the gluon-gluon fusion and weak boson fusion processes and show
how to resum a large part of the leading logarithms in the jet veto scale. Our
resummation improves on previous analyses which also aim to include the effects
of multiple soft gluon radiation. In addition we calculate the interference
between weak boson fusion and gluon-gluon fusion and find that it is small.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:09:21 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 13:23:05 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Forshaw",
"Jeff",
""
],
[
"Sjodahl",
"Malin",
""
]
] |
0705.1505 | C\'edric Lorc\'e | Lorce Cedric | Theta+ width estimation with nonzero momentum transfer | 5 pages | null | null | null | hep-ph | null | We have used the light-cone formulation of Chiral-Quark Soliton Model to
estimate the width of the lightest pentaquark Theta+. We have found that the
effect of nonzero momentum transfer is important and reduces drastically the
width to about 0.43 MeV. This means that this effect is a piece of the small
width puzzle of exotic baryons.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:22:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cedric",
"Lorce",
""
]
] |
0705.1506 | Llorens Serra | Llorens Serra, David Sanchez, and Rosa Lopez | Evanescent states in quantum wires with Rashba spin-orbit coupling | 8 pages, 8 figures | Physical Review B 76, 045339 (2007). | 10.1103/PhysRevB.76.045339 | null | cond-mat.mes-hall cond-mat.str-el | null | We discuss the calculation of evanescent states in quasi-one-dimensional
quantum wires in the presence of Rashba spin-orbit interaction. We suggest a
computational algorithm devised for cases in which longitudinal and transverse
motions are coupled. The dispersion relations are given for some selected
cases, illustrating the feasibility of the proposed computational method. As a
practical application, we discuss the solutions for a wire containing a
potential step.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:25:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Serra",
"Llorens",
""
],
[
"Sanchez",
"David",
""
],
[
"Lopez",
"Rosa",
""
]
] |
0705.1507 | Jae-Suk Park | Jae-Suk Park | Semi-Classical Quantum Fields Theories and Frobenius Manifolds | null | Lett.Math.Phys.81:41-59,2007 | 10.1007/s11005-007-0165-z | null | hep-th math.QA | null | We show that a semi-classical quantum field theory comes with a versal family
with the property that the corresponding partition function generates all path
integrals and satisfies a system of 2nd order differential equations determined
by algebras of classical observables. This versal family gives rise to a notion
of special coordinates that is analogous to that in string theories. We also
show that for a large class of semi-classical theories, their moduli space has
the structure of a Frobenius super-manifold.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:26:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Park",
"Jae-Suk",
""
]
] |
0705.1508 | Sudhanshu Barway | Sudhanshu Barway and Ajit Kembhavi (Inter University center for
Astronomy and Astrophysics (IUCAA), Pune-India) | A SuperMassive Black Hole Fundamental Plane for Ellipticals | Accepted for publication in ApJ Letters | null | 10.1086/519560 | null | astro-ph | null | We obtain the coefficients of a new fundamental plane for supermassive black
holes at the centers of elliptical galaxies, involving measured central black
hole mass and photometric parameters which define the light distribution. The
galaxies are tightly distributed around this mass fundamental plane, with
improvement in the rms residual over those obtained from the $\mbh-\sigma$ and
$\mbh-L$ relations. This implies a strong multidimensional link between the
central massive black hole formation and global photometric properties of
elliptical galaxies and provides an improved estimate of black hole mass from
galaxy data.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:26:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barway",
"Sudhanshu",
"",
"Inter University center for\n Astronomy and Astrophysics"
],
[
"Kembhavi",
"Ajit",
"",
"Inter University center for\n Astronomy and Astrophysics"
]
] |
0705.1509 | Dmitri Boiko | Dmitri L. Boiko | Coriolis-Zeeman effect in rotating photonic crystal | 9 pages, 2 figures, 1 table | null | null | null | quant-ph | null | Rotation-induced splitting of the otherwise degenerate photonic bands is
predicted for a two-dimensional photonic crystal made of evanescently coupled
microcavities. The symmetry-broken energy splitting is similar to the Zeeman
splitting of atomic levels or electron's (hole's) magnetic moment sublevels in
an external magnetic field. The orbital motion of photons in periodic photonic
lattice of microcavities is shown to enhance significantly such Coriolis-Zeeman
splitting as compared to a solitary microcavity [D.L. Boiko, Optics Express 2,
397 (1998)]. The equation of motion suggests that nonstationary rotation
induces quantum transitions between photonic states and, furthermore, that such
transitions will serve as a source of nonstationary gravitational field.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 17:15:46 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 20:11:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Boiko",
"Dmitri L.",
""
]
] |
0705.1510 | Adam Gamsa | Adam Gamsa and John Cardy | SLE in the three-state Potts model - a numerical study | 32 pages, 41 figures | Adam Gamsa et al J. Stat. Mech. (2007) P08020 | 10.1088/1742-5468/2007/08/P08020 | null | cond-mat.stat-mech math-ph math.MP | null | The scaling limit of the spin cluster boundaries of the Ising model with
domain wall boundary conditions is SLE with kappa=3. We hypothesise that the
three-state Potts model with appropriate boundary conditions has spin cluster
boundaries which are also SLE in the scaling limit, but with kappa=10/3. To
test this, we generate samples using the Wolff algorithm and test them against
predictions of SLE: we examine the statistics of the Loewner driving function,
estimate the fractal dimension and test against Schramm's formula. The results
are in support of our hypothesis.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:32:02 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 16:47:49 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Gamsa",
"Adam",
""
],
[
"Cardy",
"John",
""
]
] |
0705.1511 | Burkhard Kleihaus | Burkhard Kleihaus, Jutta Kunz, Francisco Navarro-L\'erida, Ulrike
Neemann | Stationary Dyonic Regular and Black Hole Solutions | 23 pages, 4 figures | Gen.Rel.Grav.40:1279-1310,2008 | 10.1007/s10714-007-0604-2 | null | gr-qc | null | We consider globally regular and black hole solutions in SU(2)
Einstein-Yang-Mills-Higgs theory, coupled to a dilaton field. The basic
solutions represent magnetic monopoles, monopole-antimonopole systems or black
holes with monopole or dipole hair. When the globally regular solutions carry
additionally electric charge, an angular momentum density results, except in
the simplest spherically symmetric case. We evaluate the global charges of the
solutions and their effective action, and analyze their dependence on the
gravitational coupling strength. We show, that in the presence of a dilaton
field, the black hole solutions satisfy a generalized Smarr type mass formula.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 17:16:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Navarro-Lérida",
"Francisco",
""
],
[
"Neemann",
"Ulrike",
""
]
] |
0705.1512 | ILki Kim | Ilki Kim | Comment on "note on the derivative of the hyperbolic cotangent" | null | null | null | null | quant-ph | null | In a couple of articles (Ford G W and O'Connell R F 1996 Nature 380 113 and
2002 J. Phys. A: Math. Gen. 35 4183) it was argued that the standard result for
the derivative of the hyperbolic cotangent in the literature, d \coth y/dy =
-{csch}^2 y is incomplete and the correct expression should have an additional
term proportional to the Dirac delta function. The purpose of this paper is to
demonstrate that this claim is incorrect.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:36:26 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kim",
"Ilki",
""
]
] |
0705.1513 | Jacopo Fritz | J. Fritz, B. M. Poggianti, D. Bettoni, A. Cava, W. J. Couch, M.
D'Onofrio, A. Dressler, G. Fasano, P. Kjaergaard, M. Moles, J. Varela | A spectrophotometric model applied to cluster galaxies: the WINGS
dataset | 18 pages, 14 figures. Accepted for publication in A&A | null | 10.1051/0004-6361:20077097 | null | astro-ph | null | [Abridged] The WIde-field Nearby Galaxy-cluster Survey (WINGS) is a project
aiming at the study of the galaxy populations in clusters in the local universe
(0.04<z<0.07) and the influence of environment on the physical properties of
galaxies. This survey provides a high quality set of spectroscopic data for
~6000 galaxies in 48 clusters. A salient feature of this model is the
possibility of treating dust extinction as a function of age, allowing younger
stars to be more obscured than older ones. Our technique, for the first time,
takes into account this feature in a spectral fitting code. A set of template
spectra spanning a wide range of star formation histories is built, with
features closely resembling those of typical spectra in our sample in terms of
spectral resolution, noise and wavelength coverage. Our method of analyzing
these spectra allows us to test the reliability and the uncertainties related
to each physical parameter we are inferring. The well-known degeneracy problem,
i.e. the non-uniqueness of the best fit solution (mass and extinction in
different age bins), can be addressed by assigning adequate error bars to the
recovered parameters. The values found in this way, together with their error
bars, identify the region of parameter space which contains all the possible
solutions for a given spectrum. A comparison test was also performed on a WINGS
subsample, containing objects in common with the Sloan Digital Sky Survey,
yielding excellent agreement. We find that the stellar content as a function of
age is reliably recovered in four main age bins and that the uncertainties only
mildly depend on the S/N ratio. The metallicity of the dominant stellar
population is not always recoverable unambiguosly, depending on the Star
Formation History pattern.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:47:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fritz",
"J.",
""
],
[
"Poggianti",
"B. M.",
""
],
[
"Bettoni",
"D.",
""
],
[
"Cava",
"A.",
""
],
[
"Couch",
"W. J.",
""
],
[
"D'Onofrio",
"M.",
""
],
[
"Dressler",
"A.",
""
],
[
"Fasano",
"G.",
""
],
[
"Kjaergaard",
"P.",
""
],
[
"Moles",
"M.",
""
],
[
"Varela",
"J.",
""
]
] |
0705.1514 | Duncan Brown | Duncan A. Brown | Searching for Gravitational Radiation from Binary Black Hole MACHOs in
the Galactic Halo | 206 pages, 64 figures. Typos corrected in Eqs. (2.104), (2.108),
(2.124) and (4.3) | PhD Thesis, University of Wisconsin-Milwaukee, 2004 | null | LIGO-P050015-00-R | gr-qc | null | The Laser Interferometer Gravitational Wave Observatory (LIGO) is one of a
new generation of detectors of gravitational radiation. The existence of
gravitational radiation was first predicted by Einstein in 1916, however
gravitational waves have not yet been directly observed. One source of
gravitation radiation is binary inspiral. Two compact bodies orbiting each
other, such as a pair of black holes, lose energy to gravitational radiation.
As the system loses energy the bodies spiral towards each other. This causes
their orbital speed and the amount of gravitational radiation to increase,
producing a characteristic ``chirp'' waveform in the LIGO sensitive band. In
this thesis, matched filtering of LIGO science data is used to search for low
mass binary systems in the halo of dark matter surrounding the Milky Way.
Observations of gravitational microlensing events of stars in the Large
Magellanic Cloud suggest that some fraction of the dark matter in the halo may
be in the form of Massive Astrophysical Compact Halo Objects (MACHOs). It has
been proposed that low mass black holes formed in the early universe may be a
component of the MACHO population; some fraction of these black hole MACHOs
will be in binary systems and detectable by LIGO. The inspiral from a MACHO
binary composed of two 0.5 solar mass black holes enters the LIGO sensitive
band around 40 Hz. The chirp signal increases in amplitude and frequency,
sweeping through the sensitive band to 4400 Hz in 140 seconds. By using
evidence from microlensing events and theoretical predictions of the population
an upper limit is placed on the rate of black hole MACHO inspirals in the
galactic halo.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:48:09 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Brown",
"Duncan A.",
""
]
] |
0705.1515 | Dmitri Berkov | Dmitri V. Berkov, Natalia L. Gorn | Magnetization oscillations induced by a spin-polarized current in a
point-contact geometry: mode hopping and non-linear damping effects | 18 pages, 9 figures, subm. to Phys. Rev. B; please send your
questions/comments to the 1st author (mailto: [email protected]) | null | 10.1103/PhysRevB.76.144414 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | In this paper we study magnetization excitations induced in a thin extended
film by a spin-polarized dc-current injected through a point contact in the
current-perpendicular-to-plane (CPP) geometry. Using full-scale micromagnetic
simulations, we demonstrate that in addition to the oscillations of the
propagating wave type, there exist also two localized oscillation modes. The
first localized mode has a relatively homogeneous magnetization structure of
its kernel and corresponds to the so called 'bullet' predicted analytically by
Slavin and Tiberkevich (Phys. Rev. Lett., 95 (2005) 237201). Magnetization
pattern of the second localized mode kernel is highly inhomogeneous, leading to
a much smaller power of magnetoresistance oscillations caused by this mode. We
have also studied the influence of a non-linear damping for this system and
have found the following main qualitative effects: (i) the appearance of
frequency jumps within the existence region of the propagating wave mode and
(ii) the narrowing of the current region where the 'bullet' mode exists, until
this mode completely disappears for a sufficiently strong non-linear damping.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:55:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Berkov",
"Dmitri V.",
""
],
[
"Gorn",
"Natalia L.",
""
]
] |
0705.1516 | Taylor Hughes | Xi Dai, Taylor L. Hughes, Xiao-Liang Qi, Zhong Fang and Shou-Cheng
Zhang | Helical edge and surface states in HgTe quantum wells and bulk
insulators | 5 pages | null | 10.1103/PhysRevB.77.125319 | null | cond-mat.mes-hall | null | The quantum spin Hall (QSH) effect is the property of a new state of matter
which preserves time-reversal, has an energy gap in the bulk, but has
topologically robust gapless states at the edge. Recently, it has been shown
that HgTe quantum wells realize this novel effect. In this work, we start from
realistic tight-binding models and demonstrate the existence of the helical
edge states in HgTe quantum wells and calculate their physical properties. We
also show that 3d HgTe is a topological insulator under uniaxial strain, and
show that the surface states are described by single-component massless
relativistic Dirac fermions in 2+1 dimensions. Experimental predictions are
made based on the quantitative results obtained from realistic calculations.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 17:04:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dai",
"Xi",
""
],
[
"Hughes",
"Taylor L.",
""
],
[
"Qi",
"Xiao-Liang",
""
],
[
"Fang",
"Zhong",
""
],
[
"Zhang",
"Shou-Cheng",
""
]
] |
0705.1517 | Andrea Maiorano | A. Maiorano, V. Mart\'in-Mayor, J. J. Ruiz-Lorenzo, A. Taranc\'on | Weak first order transition in the three-dimensional site-diluted Ising
antiferromagnet in a magnetic field | Final version, accepted for publication | Phys. Rev. B 76 064435 (2007) | 10.1103/PhysRevB.76.064435 | null | cond-mat.dis-nn | null | We perform intensive numerical simulations of the three-dimensional
site-diluted Ising antiferromagnet in a magnetic field at high values of the
external applied field. Even if data for small lattice sizes are compatible
with second-order criticality, the critical behavior of the system shows a
crossover from second-order to first-order behavior for large system sizes,
where signals of latent heat appear. We propose "apparent" critical exponents
for the dependence of some observables with the lattice size for a generic
(disordered) first-order phase transition.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:57:46 GMT"
},
{
"version": "v2",
"created": "Wed, 16 May 2007 17:14:19 GMT"
},
{
"version": "v3",
"created": "Thu, 14 Feb 2008 10:00:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maiorano",
"A.",
""
],
[
"Martín-Mayor",
"V.",
""
],
[
"Ruiz-Lorenzo",
"J. J.",
""
],
[
"Tarancón",
"A.",
""
]
] |
0705.1518 | Tomas Liko | Tomas Liko | Topological deformation of isolated horizons | 8 pages; 1 figure; v2: 9 pages; some comments added at the end; 3
references added; v3: minor corrections; v4: some corrections; discussion
added on black-hole mergers and violations of the second law; 2 references
added; v5: minor corrections; v6: final corrections to match PRD version | Phys.Rev.D77:064004,2008 | 10.1103/PhysRevD.77.064004 | null | gr-qc | null | We show that the Gauss-Bonnet term can have physical effects in four
dimensions. Specifically, the entropy of a black hole acquires a correction
that is proportional to the Euler characteristic of the cross sections of the
horizon. While this term is constant for a single black hole, it will be a
non-trivial function for a system with dynamical topologies such as black-hole
mergers: it is shown that for certain values of the GB parameter, the second
law of black-hole mechanics can be violated.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:10:06 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 17:03:21 GMT"
},
{
"version": "v3",
"created": "Sun, 12 Aug 2007 00:13:35 GMT"
},
{
"version": "v4",
"created": "Tue, 9 Oct 2007 20:36:45 GMT"
},
{
"version": "v5",
"created": "Wed, 28 Nov 2007 23:21:24 GMT"
},
{
"version": "v6",
"created": "Wed, 5 Mar 2008 17:44:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Liko",
"Tomas",
""
]
] |
0705.1519 | Maurice Pouzet | Maurice Pouzet and Ivo G.Rosenberg | Small clones and the projection property | 10 pages | null | null | null | math.LO math.CO | null | In 1986, the second author classified the minimal clones on a finite universe
into five types. We extend this classification to infinite universes and to
multiclones. We show that every non-trivial clone contains a "small" clone of
one of the five types. From it we deduce, in part, an earlier result, namely
that if $\mathcal C$ is a clone on a universe $A$ with at least two elements,
that contains all constant operations, then all binary idempotent operations
are projections and some $m$-ary idempotent operation is not a projection some
$m\geq 3$ if and only if there is a Boolean group $G$ on $A$ for which
$\mathcal C$ is the set of all operations $f(x_1,..., x_n)$ of the form
$a+\sum_{i\in I}x_i$ for $a\in A$ and $I\subseteq \{1,..., n\}$.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 17:13:20 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pouzet",
"Maurice",
""
],
[
"Rosenberg",
"Ivo G.",
""
]
] |
0705.1520 | Alan McConnachie | Alan McConnachie, Nobuo Arimoto, Mike Irwin | Deconstructing dwarf galaxies: a Suprime-Cam survey of Andromeda II | 17 pages, 12 figures. Accepted by MNRAS | Mon.Not.Roy.Astron.Soc.379:379-392,2007 | 10.1111/j.1365-2966.2007.11969.x | null | astro-ph | null | (Abridged) We present deep, sub-horizontal branch, multi-colour photometry of
the Andromeda II dwarf spheroidal (And II dSph) taken with Subaru Suprime-Cam.
We identify a red clump population in this galaxy, the first time this feature
has been detected in a M31 dSph, which are normally characterized as having no
significant intermediate age populations. We construct radial profiles for the
various stellar populations and show that the horizontal branch has a nearly
constant density spatial distribution out to large radius, whereas the reddest
red giant branch stars are centrally concentrated in an exponential profile. We
argue that these populations trace two distinct structural components in And II
and show that this assumption provides a good match to the overall radial
profile of this galaxy. The extended component dominates the stellar
populations at large radius, whereas the exponential component dominates the
inner few arcminutes. We show that the two components have very different
stellar populations; the exponential component has an average age of $\sim 7 -
10$ Gyrs old, is relatively metal-rich ([Fe/H] $\sim -1$) but with a
significant tail to low metallicities, and possesses a red clump. The extended
component, on the other hand, is ancient ($\sim 13$ Gyrs), metal-poor ([Fe/H]
$\sim -1.5$) with a narrower dispersion $\sigma_{\rm [Fe/H]} \simeq 0.28$, and
has a well developed blue horizontal branch. The extended component contains
approximately three-quarters of the light of And II and its unusual density
profile is unique in Local Group dwarf galaxies. This suggests that its
formation and/or evolution may have been quite different to other dwarf
galaxies.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 17:26:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"McConnachie",
"Alan",
""
],
[
"Arimoto",
"Nobuo",
""
],
[
"Irwin",
"Mike",
""
]
] |
0705.1521 | Frank Gurski | Frank Gurski | A note on module-composed graphs | 10 pages | null | null | null | cs.DS | null | In this paper we consider module-composed graphs, i.e. graphs which can be
defined by a sequence of one-vertex insertions v_1,...,v_n, such that the
neighbourhood of vertex v_i, 2<= i<= n, forms a module (a homogeneous set) of
the graph defined by vertices v_1,..., v_{i-1}.
We show that module-composed graphs are HHDS-free and thus homogeneously
orderable, weakly chordal, and perfect. Every bipartite distance hereditary
graph, every (co-2C_4,P_4)-free graph and thus every trivially perfect graph is
module-composed. We give an O(|V_G|(|V_G|+|E_G|)) time algorithm to decide
whether a given graph G is module-composed and construct a corresponding
module-sequence.
For the case of bipartite graphs, module-composed graphs are exactly distance
hereditary graphs, which implies simple linear time algorithms for their
recognition and construction of a corresponding module-sequence.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 18:08:22 GMT"
},
{
"version": "v2",
"created": "Sun, 22 Jul 2007 16:30:53 GMT"
}
] | 2007-07-23T00:00:00 | [
[
"Gurski",
"Frank",
""
]
] |
0705.1522 | Fabrizio M. E. Catanese | Fabrizio Catanese (Universitaet Bayreuth) | Differentiable and deformation type of algebraic surfaces, real and
symplectic structures | 109 pages, 10 Figures, preliminary version of a Lecture Notes, to
appear in LNM "Algebraic surfaces and symplectic 4-manifolds" | null | null | null | math.AG math.SG | null | Lecture 1: Projective and K\"ahler Manifolds, the Enriques classification,
construction techniques. Lecture 2: Surfaces of general type and their
Canonical models. Deformation equivalence and singularities. Lecture 3:
Deformation and diffeomorphism, canonical symplectic structure for surfaces of
general type. Lecture 4: Irrational pencils, orbifold fundamental groups, and
surfaces isogenous to a product. Lecture 5: Lefschetz pencils, braid and
mapping class groups, and diffeomorphism of ABC-surfaces. Epilogue:
Deformation, diffeomorphism and symplectomorphism type of surfaces of general
type.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:09:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Catanese",
"Fabrizio",
"",
"Universitaet Bayreuth"
]
] |
0705.1523 | Tobias Galla | Yoshimi Yoshino, Tobias Galla, Kei Tokita | Statistical mechanics and stability of a model eco-system | 23 pages, 13 figures; text of paper modified, discussion extended,
references added | J. Stat. Mech. (2007) P09003 | 10.1088/1742-5468/2007/09/P09003 | null | q-bio.PE cond-mat.dis-nn cond-mat.stat-mech | null | We study a model ecosystem by means of dynamical techniques from disordered
systems theory. The model describes a set of species subject to competitive
interactions through a background of resources, which they feed upon.
Additionally direct competitive or co-operative interaction between species may
occur through a random coupling matrix. We compute the order parameters of the
system in a fixed point regime, and identify the onset of instability and
compute the phase diagram. We focus on the effects of variability of resources,
direct interaction between species, co-operation pressure and dilution on the
stability and the diversity of the ecosystem. It is shown that resources can be
exploited optimally only in absence of co-operation pressure or direct
interaction between species.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 18:38:36 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 09:55:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yoshino",
"Yoshimi",
""
],
[
"Galla",
"Tobias",
""
],
[
"Tokita",
"Kei",
""
]
] |
0705.1524 | Hiroyasu Tajima | Hiroyasu Tajima (1), Tuneyoshi Kamae (1), Stefano Finazzi (2), Johann
Cohen-Tanugi (1), James Chiang (1 and 3) ((1) Stanford Linear Accelerator
Center, (2) Scuola Normale Superiore, (3) CRESST, University of Maryland) | Studies of Cosmic Rays with GeV Gamma Rays | 9 pages, 6 figures, Invited Talk at International Workshop on
"Cosmic-Rays and High Energy Universe," Aoyama-Gakuin University, Shibuya,
Tokyo, Japan, March 5-6, 2007 | null | null | SLAC-PUB-12509 | astro-ph | null | We describe the role of GeV gamma-ray observations with GLAST-LAT (Gamma-ray
Large Area Space Telescope - Large Area Telescope) in identifying interaction
sites of cosmic-ray proton (or hadrons) with interstellar medium (ISM). We
expect to detect gamma rays from neutral pion decays in high-density ISM
regions in the Galaxy, Large Magellanic Cloud, and other satellite galaxies.
These gamma-ray sources have been detected already with EGRET (Energetic Gamma
Ray Experiment Telescope) as extended sources (eg. LMC and Orion clouds) and
GLAST-LAT will detect many more with a higher spatial resolution and in a wider
spectral range. We have developed a novel image restoration technique based on
the Richardson-Lucy algorithm optimized for GLAST-LAT observation of extended
sources. Our algorithm calculates PSF (point spread function) for each event.
This step is very important for GLAST-LAT and EGRET image analysis since PSF
varies more than one order of magnitude from one gamma ray to another depending
on its energy as well as its impact point and angle in the instrument. The
GLAST-LAT and EGRET image analysis has to cope with Poisson fluctuation due to
low number of detected photons for most sources. Our technique incorporates
wavelet filtering to minimize effects due to the fluctuation. Preliminary
studies on some EGRET sources are presented, which shows potential of this
novel image restoration technique for the identification and characterisation
of extended gamma-ray sources.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 18:56:08 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Tajima",
"Hiroyasu",
"",
"1 and 3"
],
[
"Kamae",
"Tuneyoshi",
"",
"1 and 3"
],
[
"Finazzi",
"Stefano",
"",
"1 and 3"
],
[
"Cohen-Tanugi",
"Johann",
"",
"1 and 3"
],
[
"Chiang",
"James",
"",
"1 and 3"
]
] |
0705.1525 | David S. Armstrong | G0 Collaboration: D.S. Armstrong, et al | Transverse Beam Spin Asymmetries in Forward-Angle Elastic
Electron-Proton Scattering | 5 pages, 3 figures, submitted to Physical Review Letters; shortened
to meet PRL length limit, clarified some text after referee's comments | Phys.Rev.Lett.99:092301,2007 | 10.1103/PhysRevLett.99.092301 | WM-07-04 | nucl-ex hep-ph | null | We have measured the beam-normal single-spin asymmetry in elastic scattering
of transversely-polarized 3 GeV electrons from unpolarized protons at Q^2 =
0.15, 0.25 (GeV/c)^2. The results are inconsistent with calculations solely
using the elastic nucleon intermediate state, and generally agree with
calculations with significant inelastic hadronic intermediate state
contributions. A_n provides a direct probe of the imaginary component of the
2-gamma exchange amplitude, the complete description of which is important in
the interpretation of data from precision electron-scattering experiments.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:12:22 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 20:56:04 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Jul 2007 14:19:32 GMT"
}
] | 2010-04-06T00:00:00 | [
[
"G0 Collaboration",
"",
""
],
[
"Armstrong",
"D. S.",
""
]
] |
0705.1526 | Evaggelia Lyratzi | E. Danezis (1), D. Nikolaidis (1), E. Lyratzi (1), L. \v{C}.
Popovi\'c, M. S. Dimitrijevi\'c, A. Antoniou, E. Theodosiou ((1) University
of Athens, Faculty of Physics, Section of Astrophysics, Astronomy and
Mechanics, (2) Astronomical Observatory of Belgrade) | A new model for the structure of the DACs and SACs regions in the Oe and
Be stellar atmospheres | 9 pages, 5 figures, accepted for publication in PASJ | null | 10.1093/pasj/59.4.827 | null | astro-ph | null | In this paper we present a new mathematical model for the density regions
where a specific spectral line and its SACs/DACs are created in the Oe and Be
stellar atmospheres. In the calculations of final spectral line function we
consider that the main reasons of the line broadening are the rotation of the
density regions creating the spectral line and its DACs/SACs, as well as the
random motions of the ions. This line function is able to reproduce the
spectral feature and it enables us to calculate some important physical
parameters, such as the rotational, the radial and the random velocities, the
Full Width at Half Maximum, the Gaussian deviation, the optical depth, the
column density and the absorbed or emitted energy. Additionally, we can
calculate the percentage of the contribution of the rotational velocity and the
ions' random motions of the DACs/SACs regions to the line broadening. Finally,
we present two tests and three short applications of the proposed model.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 18:37:57 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Danezis",
"E.",
""
],
[
"Nikolaidis",
"D.",
""
],
[
"Lyratzi",
"E.",
""
],
[
"Popović",
"L. Č.",
""
],
[
"Dimitrijević",
"M. S.",
""
],
[
"Antoniou",
"A.",
""
],
[
"Theodosiou",
"E.",
""
]
] |
0705.1527 | Abdul Rumaiz | Bakhtyar Ali, Abdul K Rumaiz, S. Ismat Shah, Arif Ozbay, Edmund R
Nowak | Influence of oxygen partial pressure on structural, transport and
magnetic properties of Co doped TiO2 films | 20 pages, 6 figures submitted to Journal of Applied Physics | null | null | null | cond-mat.mtrl-sci | null | Thin films of Co-TiO2 are deposited on silicon and quartz substrates using
Pulse Laser Deposition (PLD) process at various oxygen partial pressures
ranging from 6.6 x 10-3 Pascals (Pa) to 53 Pa. Crystal structure, transport and
magnetic properties of reduced CoxTi(1-x)O2 (0 <x< 0.03) thin films are
investigated and are found to have a strong dependence on the oxygen partial
pressure. X-ray diffraction (XRD) data reveals the presence of mixed phase
material containing both anatase and rutile. However, these phases
intertransform with the change in the oxygen partial pressure in the chamber
during the growth of the films. X-ray Photoelectron Spectroscopy (XPS) shows no
Co or CoO related peaks for samples with Co concentration up to x=0.03.
However, the oxygen 1s peaks are asymmetric suggesting the presence of oxygen
vacancies. The transport and magnetic measurements show a clear dependence on
the concentration of oxygen vacancies. There is an enhancement in the
electrical conductivity and the magnetization as more vacancies are created in
the material. The resistivity as a function of temperature rho(T) follows the
polaronic behavior and the activation energies obtained, ~100 to 150meV, are
within the range that is typical for semiconducting materials.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 18:38:39 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ali",
"Bakhtyar",
""
],
[
"Rumaiz",
"Abdul K",
""
],
[
"Shah",
"S. Ismat",
""
],
[
"Ozbay",
"Arif",
""
],
[
"Nowak",
"Edmund R",
""
]
] |
0705.1528 | Maxim Chernodub | M. Bock, M.N. Chernodub, E.-M. Ilgenfritz and A. Schiller | An Abelian two-Higgs model of strongly correlated electrons: phase
structure, strengthening of phase transition and QCD at finite density | 21 pages, 40 figures, RevTeX 4.0 | Phys.Rev.B76:184502,2007 | 10.1103/PhysRevB.76.184502 | ITEP-LAT/2007-09, HU-EP-07/14, LU-ITP 2007/001 | cond-mat.str-el cond-mat.supr-con hep-lat hep-ph | null | We investigate non-perturbative features of a three-dimensional Abelian Higgs
model with singly- and doubly-charged scalar fields coupled to a single compact
Abelian gauge field. The model is pretending to describe various planar systems
of strongly correlated electrons such as high-Tc superconductivity in the
overdoped regime and exotic materials possessing excitations with
fractionalized quantum numbers. The complicated phase structure of the model is
studied thoroughly using numerical tools and analytical arguments. In the
three-dimensional space of coupling parameters we identify the Fermi liquid,
the spin gap, the superconductor and the strange metallic phases. The behavior
of three kinds of topological defects -- holon and spinon vortices and
monopoles - is explored in various phases. We also observe a new effect, the
strong enhancement of the phase transition strength reflected in a lower order
of the transition: at sufficiently strong gauge coupling the two second order
phase transitions -- corresponding to spinon-pair and holon condensation lines
- join partially in the phase diagram and become a first order phase transition
in that region. The last observation may have an analogue in Quantum
Chromodynamics at non-zero temperature and finite baryon density. We argue that
at sufficiently large baryon density the finite-temperature transition between
the (3-flavor paired) color superconducting phase and the quark-gluon plasma
phases should be much stronger compared with the transition between 2-flavor
paired and 3-flavor paired superconducting phases.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:39:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bock",
"M.",
""
],
[
"Chernodub",
"M. N.",
""
],
[
"Ilgenfritz",
"E. -M.",
""
],
[
"Schiller",
"A.",
""
]
] |
0705.1529 | Leopoldo A. Pando Zayas | C. A. Ballon Bayona, Henrique Boschi-Filho, Nelson R. F. Braga and
Leopoldo A. Pando Zayas | On a Holographic Model for Confinement/Deconfinement | 14 pages. V2: We included a new section discussing the soft wall
model and new references. V3: We clarified some points and updated the
references. Results unchanged. Version published in PRD | Phys.Rev.D77:046002,2008 | 10.1103/PhysRevD.77.046002 | MCTP-07-17 | hep-th | null | We study the thermodynamics of the hard wall model, which consists in the
introduction of an infrared cut-off in asymptotically AdS spaces. This is a toy
model for confining backgrounds in the context of the gauge/gravity
correspondence. We use holographic renormalization and reproduce the existence
of a Hawking Page phase transition recently discussed by Herzog. We also show
that the entropy jumps from $N^0$ to $N^2$, which reinforces the interpretation
of this transition as the gravity dual of confinement/deconfinement. We also
show that similar results hold for the phenomenologically motivated soft wall
model, underlining the potential universality of our analysis.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:01:52 GMT"
},
{
"version": "v2",
"created": "Wed, 16 May 2007 18:00:48 GMT"
},
{
"version": "v3",
"created": "Thu, 6 Mar 2008 20:47:22 GMT"
}
] | 2008-03-06T00:00:00 | [
[
"Bayona",
"C. A. Ballon",
""
],
[
"Boschi-Filho",
"Henrique",
""
],
[
"Braga",
"Nelson R. F.",
""
],
[
"Zayas",
"Leopoldo A. Pando",
""
]
] |
0705.1530 | Denis Basko | D. M. Basko | Effect of inelastic collisions on multiphonon Raman scattering in
graphene | null | Phys. Rev. B 76, 081405 (2007) | 10.1103/PhysRevB.76.081405 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | We calculate the probabilities of two- and four-phonon Raman scattering in
graphene and show how the relative intensities of the overtone peaks encode
information about relative rates of different inelastic processes electrons are
subject to. If the most important processes are electron-phonon and
electron-electron scattering, the rate of the latter can be deduced from the
Raman spectra.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:01:13 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Sep 2007 09:51:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Basko",
"D. M.",
""
]
] |
0705.1531 | Fran\c{c}ois Gelis | A. Bessa, C.A.A. de Carvalho, E.S. Fraga, F. Gelis | Semiclassical thermodynamics of scalar fields | 24 pages, 5 postscript figures | JHEP 0708:007,2007 | 10.1088/1126-6708/2007/08/007 | CERN-PH-TH/2007-076 | hep-ph | null | We present a systematic semiclassical procedure to compute the partition
function for scalar field theories at finite temperature. The central objects
in our scheme are the solutions of the classical equations of motion in
imaginary time, with spatially independent boundary conditions. Field
fluctuations -- both field deviations around these classical solutions, and
fluctuations of the boundary value of the fields -- are resummed in a Gaussian
approximation. In our final expression for the partition function, this
resummation is reduced to solving certain ordinary differential equations.
Moreover, we show that it is renormalizable with the usual 1-loop counterterms.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 18:57:02 GMT"
}
] | 2010-02-03T00:00:00 | [
[
"Bessa",
"A.",
""
],
[
"de Carvalho",
"C. A. A.",
""
],
[
"Fraga",
"E. S.",
""
],
[
"Gelis",
"F.",
""
]
] |
0705.1532 | Hocine Sellama | Hocine Sellama (IRMA) | On the distance between separatrices for the discretized logistic
differential equation | 44 pages | null | null | null | math.DS | null | We consider the discretization
y(t+\epsilon)=y(t-\epsilon)+2\epsilon\big(1-y(t)^{2}\big),
$\epsilon>0$ a small parameter, of the logistic differential equation
$y'=2\big(1-y^{2}\big)$, which can also be seen as a discretization of the
system
{y'=2\big(1-v^{2}\big),
v'= 2\big(1-y^{2}\big).
This system has two saddle points at $A=(1,1)$, $B=(-1, -1)$ and there exist
stable and unstable manifolds. We will show that the stable manifold
$W_{s}^{+}$ of the point $A=(1,1)$ and the unstable manifold $W_{i}^{-}$ of the
point $B=(-1, -1)$ for the discretization do not coincide. The vertical
distance between these two manifolds is exponentially small but not zero, in
particular we give an asymptotic estimate of this distance. For this purpose we
will use a method adapted from the paper of Sch\"afke-Volkmer \cite{SV} using
formal series and accurate estimates of the coefficients.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 18:59:30 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jun 2008 09:39:59 GMT"
}
] | 2008-06-12T00:00:00 | [
[
"Sellama",
"Hocine",
"",
"IRMA"
]
] |
0705.1533 | Stefano Panebianco | S. Panebianco, P. Beauvais, O. Bringer, S. Chabod, F. Chartier, E.
Dupont, A. Letourneau, P. Lotrus, L. Oriol, F. Molinie, J. Ch. Toussaint | Neutronic performances of the MEGAPIE target | 4 pages, Proceedings of the International Conference on Nuclear Data
for Science and Technology 2007 (ND2007), 23-27 April 2007, Nice, France | null | null | null | nucl-ex | null | The MEGAPIE project is a key experiment on the road to Accelerator Driven
Systems and it provides the scientific community with unique data on the
behavior of a liquid lead-bismuth spallation target under realistic and long
term irradiation conditions. The neutronic of such target is of course of prime
importance when considering its final destination as an intense neutron source.
This is the motivation to characterize the inside neutron flux of the target in
operation. A complex detector, made of 8 micro fission-chambers, has been built
and installed in the core of the target, few tens of centimeters from the
proton/Pb-Bi interaction zone. This detector is designed to measure the
absolute neutron flux inside the target, to give its spatial distribution and
to correlate its temporal variations with the beam intensity. Moreover,
integral information on the neutron energy distribution as a function of the
position along the beam axis could be extracted, giving integral constraints on
the neutron production models implemented in transport codes such as MCNPX.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:00:10 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Oct 2007 12:41:54 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Panebianco",
"S.",
""
],
[
"Beauvais",
"P.",
""
],
[
"Bringer",
"O.",
""
],
[
"Chabod",
"S.",
""
],
[
"Chartier",
"F.",
""
],
[
"Dupont",
"E.",
""
],
[
"Letourneau",
"A.",
""
],
[
"Lotrus",
"P.",
""
],
[
"Oriol",
"L.",
""
],
[
"Molinie",
"F.",
""
],
[
"Toussaint",
"J. Ch.",
""
]
] |
0705.1534 | Anita Reimer | A. Reimer | The redshift-dependence of gamma-ray absorption in the environments of
strong-line AGN | 19 pages, 5 figures; accepted for publication in ApJ | Astrophys.J.665:1023-1029,2007 | 10.1086/519766 | null | astro-ph | null | The case of gamma-ray absorption due to photon-photon pair production of jet
photons in the external photon environment like accretion disk and broad-line
region radiation field of gamma-ray loud active galactic nuclei (AGN) that
exhibit strong emission lines is considered. I demonstrate that this ''local
opacity'', if detected, will almost unavoidably be redshift-dependent in the
sub-TeV range. This introduces non-negligible biases, and complicates
approaches for studying the evolution of the extragalactic background light
with contemporary GeV instruments like e.g. the Gamma-ray Large Area Space
Telescope (GLAST), etc., where the gamma-ray horizon is probed by means of
statistical analysis of absorption features (e.g. Fazio-Stecker relation, etc.)
in AGN spectra at various redshifts. It particularly applies to strong-line
quasars where external photon fields are potentially involved in gamma-ray
production.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:07:32 GMT"
}
] | 2009-02-26T00:00:00 | [
[
"Reimer",
"A.",
""
]
] |
0705.1535 | Nicolas Ferey | Nicolas F\'erey (LIMSI), Pierre-Emmanuel Gros (LIMSI), Joan H\'erisson
(LIMSI), Rachid Gherbi (LIMSI) | Visual Data Mining of Genomic Databases by Immersive Graph-Based
Exploration | null | Visual Data Mining of Genomic Databases by Immersive Graph-Based
Exploration (2005) 4 | null | null | q-bio.QM | null | Biologists are leading current research on genome characterization
(sequencing, alignment, transcription), providing a huge quantity of raw data
about many genome organisms. Extracting knowledge from this raw data is an
important process for biologists, using usually data mining approaches.
However, it is difficult to deals with these genomic information using actual
bioinformatics data mining tools, because data are heterogeneous, huge in
quantity and geographically distributed. In this paper, we present a new
approach between data mining and virtual reality visualization, called visual
data mining. Indeed Virtual Reality becomes ripe, with efficient display
devices and intuitive interaction in an immersive context. Moreover, biologists
use to work with 3D representation of their molecules, but in a desktop
context. We present a software solution, Genome3DExplorer, which addresses the
problem of genomic data visualization, of scene management and interaction.
This solution is based on a well-adapted graphical and interaction paradigm,
where local and global topological characteristics of data are easily visible,
on the contrary to traditional genomic database browsers, always focused on the
zoom and details level.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:09:08 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Férey",
"Nicolas",
"",
"LIMSI"
],
[
"Gros",
"Pierre-Emmanuel",
"",
"LIMSI"
],
[
"Hérisson",
"Joan",
"",
"LIMSI"
],
[
"Gherbi",
"Rachid",
"",
"LIMSI"
]
] |
0705.1536 | Naceur-Eddine Khelifa | N.-E. Kh\'elifa (LNE- Inm), H. Fang, J. Xu, P. Juncar (LNE- Inm), M.
Himbert (LNE- Inm) | Refractometer for Tracking Changes in the Refractive Index of Air Near
780 nm | null | Applied Optics 37, 1 (01/01/1998) 15 | null | null | physics.optics | null | A new system, consisting of a double channel Fabry Perot etalon and laser
diodes emitting around 780 nm is described and proposed to be used for air
refractive index measurements. The principle of this refractometer is based on
frequency measurements between optical laser sources. It permits
quasi-instantaneous measurement with a resolution better than and uncertainty
in the range. Some preliminary results on the stability of this system and the
measurements of the refractive index of air with this apparatus are presented.
The first measurements of the index of air at 780 nm are, within an
experimental uncertainty of the order of, in agreement with the predicted
values by the so-called revised Edl\'en equations. This result is to the best
of our knowledge the first to extend to the near infra-red the validity of the
revised Edl\'en equation derived for the wavelength range 350- 650 nm.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:12:22 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Khélifa",
"N. -E.",
"",
"LNE- Inm"
],
[
"Fang",
"H.",
"",
"LNE- Inm"
],
[
"Xu",
"J.",
"",
"LNE- Inm"
],
[
"Juncar",
"P.",
"",
"LNE- Inm"
],
[
"Himbert",
"M.",
"",
"LNE- Inm"
]
] |
0705.1537 | Fulvio Melia | Fulvio Melia | Supermassive Black Holes | 26 pages, 15 figures, to appear in "Kerr Spacetime: Rotating Black
Holes in General Relativity" eds. D.L. Wiltshire, M. Visser and S.M. Scott,
(Cambridge Univ. Press) | null | null | null | astro-ph | null | Supermassive black holes have generally been recognized as the most
destructive force in nature. But in recent years, they have undergone a
dramatic shift in paradigm. These objects may have been critical to the
formation of structure in the early universe, spawning bursts of star formation
and nucleating proto-galactic condensations. Possibly half of all the radiation
produced after the Big Bang may be attributed to them, whose number is now
known to exceed 300 million. The most accessible among them is situated at the
Center of Our Galaxy. In the following pages, we will examine the evidence that
has brought us to this point, and we will understand why many expect to
actually image the event horizon of the Galaxy's central black hole within this
decade.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:13:40 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Melia",
"Fulvio",
""
]
] |
0705.1538 | Anita Reimer | A. Reimer (HEPL/KIPAC, Stanford University) | GeV photon absorption in cosmologically evolving quasar environments | 2 pages, 2 figures; to appear in the Proc. of the First Int. GLAST
Symp. (Stanford, Feb. 5-8, 2007), eds. S.Ritz, P.F.Michelson, and C.Meegan,
AIP Conf. Proc | AIP Conf.Proc.921:357-358,2007 | 10.1063/1.2757350 | null | astro-ph | null | The question of a possible redshift-dependence of gamma-ray absorption due to
gamma-gamma pair production of jet photons in the accretion disk and BLR
radiation field in strong-line quasars is investigated. For this relevant
aspects of cosmological black hole and quasar evolution are applied to the
expected pair production opacity of GeV-photons in those sources. I demonstrate
that for positively evolving and non-evolving accretion rates over cosmological
time, detectable gamma-ray optical depths originating within the AGN system
will show a redshift-dependence in the LAT energy range with larger opacity
from sources at higher redshifts. This introduces ambiguities in the
interpretation of spectral absorption features, and complicates approaches for
estimating the evolution of the extragalactic background light by probing the
gamma-ray horizon when using blazars whose external photon fields are involved
in gamma-ray production.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:15:47 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Reimer",
"A.",
"",
"HEPL/KIPAC, Stanford University"
]
] |
0705.1539 | Anita Reimer | Anita Reimer and Olaf Reimer (HEPL/KIPAC, Stanford University) | Massive stars in colliding wind systems: the GLAST perspective | 3 pages, 3 figures; to appear in the Proc. of the First Int. GLAST
Symp. (Stanford, Feb. 5-8, 2007), eds. S.Ritz, P.F.Michelson, and C.Meegan,
AIP Conf. Proc | AIP Conf.Proc.921:217-219,2007 | 10.1063/1.2757304 | null | astro-ph | null | Colliding winds of massive stars in binary systems are considered as
candidate sites of high-energy non-thermal photon emission. They are already
among the suggested counterparts for a few individual unidentified EGRET
sources, but may constitute a detectable source population for the GLAST
observatory. The present work investigates such population study of massive
colliding wind systems at high-energy gamma-rays. Based on the recent detailed
model (Reimer et al. 2006) for non-thermal photon production in prime candidate
systems, we unveil the expected characteristics of this source class in the
observables accessible at LAT energies. Combining the broadband emission model
with the presently cataloged distribution of such systems and their individual
parameters allows us to conclude on the expected maximum number of
LAT-detections among massive stars in colliding wind binary systems.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:21:24 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Reimer",
"Anita",
"",
"HEPL/KIPAC, Stanford University"
],
[
"Reimer",
"Olaf",
"",
"HEPL/KIPAC, Stanford University"
]
] |
0705.1540 | Shaffique Adam | Shaffique Adam, E. H. Hwang, Victor Galitski, S. Das Sarma | A self-consistent theory for graphene transport | To be published in Proc. Natl. Acad. Sci. USA | Proc. Natl. Acad. Sci. USA 104, 18392 (2007) | 10.1073/pnas.0704772104 | null | cond-mat.mes-hall | null | We demonstrate theoretically that most of the observed transport properties
of graphene sheets at zero magnetic field can be explained by scattering from
charged impurities. We find that, contrary to common perception, these
properties are not universal but depend on the concentration of charged
impurities $n_{\rm imp}$. For dirty samples ($250 \times 10^{10} {\rm cm}^{-2}
< n_{\rm imp} < 400 \times 10^{10} {\rm cm}^{-2}$), the value of the minimum
conductivity at low carrier density is indeed $4 e^2/h$ in agreement with early
experiments, with weak dependence on impurity concentration. For cleaner
samples, we predict that the minimum conductivity depends strongly on $n_{\rm
imp}$, increasing to $8 e^2/h$ for $n_{\rm imp} \sim 20 \times 10^{10}{\rm
cm}^{-2}$. A clear strategy to improve graphene mobility is to eliminate
charged impurities or use a substrate with a larger dielectric constant.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:37:04 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 18:54:50 GMT"
}
] | 2008-01-14T00:00:00 | [
[
"Adam",
"Shaffique",
""
],
[
"Hwang",
"E. H.",
""
],
[
"Galitski",
"Victor",
""
],
[
"Sarma",
"S. Das",
""
]
] |
0705.1541 | Joseph O'Rourke | Mirela Damian, Robin Flatland, Joseph O'Rourke | Unfolding Manhattan Towers | Full version of abstract that appeared in: Proc. 17th Canad. Conf.
Comput. Geom., 2005, pp. 204--207 | null | null | null | cs.CG cs.DM | null | We provide an algorithm for unfolding the surface of any orthogonal
polyhedron that falls into a particular shape class we call Manhattan Towers,
to a nonoverlapping planar orthogonal polygon. The algorithm cuts along edges
of a 4x5x1 refinement of the vertex grid.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:50:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Damian",
"Mirela",
""
],
[
"Flatland",
"Robin",
""
],
[
"O'Rourke",
"Joseph",
""
]
] |
0705.1542 | Mary Manning | M. Lisa Manning, B. Bamieh, J. M. Carlson | Descriptor approach for eliminating spurious eigenvalues in hydrodynamic
equations | 13 pages, 1 figure, revised for submission to SIAM Sci. Comp., moved
background information to appendices | null | null | null | physics.comp-ph physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a general framework for avoiding spurious eigenvalues --
unphysical unstable eigenvalues that often occur in hydrodynamic stability
problems. In two example problems, we show that when system stability is
analyzed numerically using {\em descriptor} notation, spurious eigenvalues are
eliminated. Descriptor notation is a generalized eigenvalue formulation for
differential-algebraic equations that explicitly retains algebraic constraints.
We propose that spurious eigenvalues are likely to occur when algebraic
constraints are used to analytically reduce the number of independent variables
in a differential-algebraic system of equations before the system is
approximated numerically. In contrast, the simple and easily generalizable
descriptor framework simultaneously solves the differential equations and
algebraic constraints and is well-suited to stability analysis in these
systems.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:57:09 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Dec 2008 15:58:06 GMT"
}
] | 2008-12-01T00:00:00 | [
[
"Manning",
"M. Lisa",
""
],
[
"Bamieh",
"B.",
""
],
[
"Carlson",
"J. M.",
""
]
] |
0705.1543 | Gregory A. Fiete | Gregory A. Fiete, Gil Refael, Matthew P. A. Fisher | Universal Periods in Quantum Hall Droplets | 4 pages, 4 figures | Phys. Rev. Lett. 99, 166805 (2007) | 10.1103/PhysRevLett.99.166805 | NSF-KITP-07189 | cond-mat.mes-hall cond-mat.str-el | null | Using the hierarchy picture of the fractional quantum Hall effect, we study
the the ground state periodicity of a finite size quantum Hall droplet in a
quantum Hall fluid of a different filling factor. The droplet edge charge is
periodically modulated with flux through the droplet and will lead to a
periodic variation in the conductance of a nearby point contact, such as occurs
in some quantum Hall interferometers. Our model is consistent with experiment
and predicts that superperiods can be observed in geometries where no
interfering trajectories occur. The model may also provide an experimentally
feasible method of detecting elusive neutral modes and otherwise obtaining
information about the microscopic edge structure in fractional quantum Hall
states.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 23:55:51 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 04:56:51 GMT"
},
{
"version": "v3",
"created": "Sat, 20 Oct 2007 18:01:23 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Fiete",
"Gregory A.",
""
],
[
"Refael",
"Gil",
""
],
[
"Fisher",
"Matthew P. A.",
""
]
] |
0705.1544 | Dr Paul A. Crowther | Paul A Crowther (Sheffield), S. Carpano (ESAC Madrid), L.J. Hadfield
(Sheffield), A.M.T. Pollock (ESAC Madrid) | On the optical counterpart of NGC300 X-1 and the global Wolf-Rayet
content of NGC300 | 5 pages, 5 figures, accepted for A&A Letters | A&A 469, L31 (2007) | 10.1051/0004-6361:20077677 | null | astro-ph | null | (Conext:) Surveys of Wolf-Rayet (WR) populations in nearby galaxies provide
tests of evolutionary models plus Type Ib/c supernova progenitors. This
spectroscopic study complements the recent imaging survey of the spiral galaxy
NGC 300 by Schild et al. (Aims): Revisions to the known WR content of NGC 300
are presented. We investigate the WR nature of candidate #41 from Schild et al.
which is spatially coincident with the bright X-ray point source NGC 300 X-1;
(Methods:) VLT/FORS2 multi-object spectroscopy of WR candidates in NGC 300 is
obtained; (Results:) We establish an early-type WN nature of #41, i.e. similar
to the optical counterpart of IC 10 X-1, which closely resembles NGC 300 X-1.
We confirm 9 new WR stars, bringing the current WR census of the inner disk to
31, with N(WC)/N(WN)~0.9. (Conclusions:) If #41 is the optical counterpart for
NGC 300 X-1, we estimate a WR mass of 38 Msun based upon ground-based
photometry, from which a black hole mass of > 10 Msun results from the 32.8 hr
period of the system and WR wind velocity of 1250 km/s. We estimate an 95%
completeness among WC stars and 70% among WN stars, such that the total WR
content is ~40, with N(WC)/N(WN)~0.7. From the Halpha-derived star formation
rate of the inner galaxy, we infer N(WR)/N(O)~0.04
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 20:20:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Crowther",
"Paul A",
"",
"Sheffield"
],
[
"Carpano",
"S.",
"",
"ESAC Madrid"
],
[
"Hadfield",
"L. J.",
"",
"Sheffield"
],
[
"Pollock",
"A. M. T.",
"",
"ESAC Madrid"
]
] |
0705.1545 | Lijun Gou | L. J. Gou and P. Meszaros | GLAST Prospects for Swift-Era Afterglows | 19 pages, 5 figures, ApJ, in press | Astrophys.J.668:392-399,2008 | 10.1086/521045 | null | astro-ph | null | We calculate the GeV spectra of GRB afterglows produced by inverse Compton
scattering of the sub-MeV emission of these objects. We improve on earlier
treatments by using refined afterglow parameters and new model developments
motivated by recent Swift observations. We present time-dependent GeV spectra
for standard, constant parameter models, as well as for models with energy
injection and with time-varying parameters, for a range of burst parameters. We
evaluate the limiting redshift to which such afterglows can be detected by the
GLAST LAT, as well as AGILE.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 14:26:44 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Jun 2007 14:24:20 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Gou",
"L. J.",
""
],
[
"Meszaros",
"P.",
""
]
] |
0705.1546 | Rajib Ganguly | Rajib Ganguly (University of Wyoming), Michael S. Brotherton
(University of Wyoming), Sabrina Cales (University of Wyoming), Brian
Scoggins (University of Wyoming), Zhaohui Shang (University of Wyoming,
Tianjin Normal University), Marianne Vestergaard (University of
Arizona/Steward Observatory) | Outflows and the Physical Properties of Quasars | Uses emulateapj.cls, 14 pages including 7 tables and 7 figures.
Accepted for publication in the Astrophysical Journal, Unabridged version of
Table 4 can be downloaded from http://physics.uwyo.edu/agn/ | Astrophys.J.665:990-1003,2007 | 10.1086/519759 | null | astro-ph | null | We have investigated a sample of 5088 quasars from the Sloan Digital Sky
Survey Second Data Release in order to determine how the frequency and
properties of broad absorptions lines (BALs) depend on black hole mass,
bolometric luminosity, Eddington fraction (L/L_Edd), and spectral slope. We
focus only on high-ionization BALs and find a number of significant results.
While quasars accreting near the Eddington limit are more likely to show BALs
than lower $L/L_{Edd}$ systems, BALs are present in quasars accreting at only a
few percent Eddington. We find a stronger effect with bolometric luminosity,
such that the most luminous quasars are more likely to show BALs. There is an
additional effect, previously known, that BAL quasars are redder on average
than unabsorbed quasars. The strongest effects involving the quasar physical
properties and BAL properties are related to terminal outflow velocity. Maximum
observed outflow velocities increase with both the bolometric luminosity and
the blueness of the spectral slope, suggesting that the ultraviolet luminosity
to a great extent determines the acceleration. These results support the idea
of outflow acceleration via ultraviolet line scattering.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 20:25:53 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ganguly",
"Rajib",
"",
"University of Wyoming"
],
[
"Brotherton",
"Michael S.",
"",
"University of Wyoming"
],
[
"Cales",
"Sabrina",
"",
"University of Wyoming"
],
[
"Scoggins",
"Brian",
"",
"University of Wyoming"
],
[
"Shang",
"Zhaohui",
"",
"University of Wyoming,\n Tianjin Normal University"
],
[
"Vestergaard",
"Marianne",
"",
"University of\n Arizona/Steward Observatory"
]
] |
0705.1547 | Zhenhua Wu | Zhenhua Wu, Cecilia Lagorio, Lidia A. Braunstein, Reuven Cohen, Shlomo
Havlin, H. Eugene Stanley | Numerical evaluation of the upper critical dimension of percolation in
scale-free networks | 10 pages, 5 figures | Phys. Rev. E 75, 066110 (2007) | 10.1103/PhysRevE.75.066110 | null | cond-mat.dis-nn cond-mat.stat-mech | null | We propose a numerical method to evaluate the upper critical dimension $d_c$
of random percolation clusters in Erd\H{o}s-R\'{e}nyi networks and in
scale-free networks with degree distribution ${\cal P}(k) \sim k^{-\lambda}$,
where $k$ is the degree of a node and $\lambda$ is the broadness of the degree
distribution. Our results report the theoretical prediction, $d_c = 2(\lambda -
1)/(\lambda - 3)$ for scale-free networks with $3 < \lambda < 4$ and $d_c = 6$
for Erd\H{o}s-R\'{e}nyi networks and scale-free networks with $\lambda > 4$.
When the removal of nodes is not random but targeted on removing the highest
degree nodes we obtain $d_c = 6$ for all $\lambda > 2$. Our method also yields
a better numerical evaluation of the critical percolation threshold, $p_c$, for
scale-free networks. Our results suggest that the finite size effects increases
when $\lambda$ approaches 3 from above.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 20:29:45 GMT"
}
] | 2007-10-08T00:00:00 | [
[
"Wu",
"Zhenhua",
""
],
[
"Lagorio",
"Cecilia",
""
],
[
"Braunstein",
"Lidia A.",
""
],
[
"Cohen",
"Reuven",
""
],
[
"Havlin",
"Shlomo",
""
],
[
"Stanley",
"H. Eugene",
""
]
] |
0705.1548 | Greg Stephens | Greg J Stephens, Bethany Johnson-Kerner, William Bialek and William S
Ryu | Dimensionality and dynamics in the behavior of C. elegans | 9 pages, 6 figures, minor corrections | PLoS Comput Biol 4(4): e1000028 (2008) | 10.1371/journal.pcbi.1000028 | null | q-bio.OT | null | A major challenge in analyzing animal behavior is to discover some underlying
simplicity in complex motor actions. Here we show that the space of shapes
adopted by the nematode C. elegans is surprisingly low dimensional, with just
four dimensions accounting for 95% of the shape variance, and we partially
reconstruct "equations of motion" for the dynamics in this space. These
dynamics have multiple attractors, and we find that the worm visits these in a
rapid and almost completely deterministic response to weak thermal stimuli.
Stimulus-dependent correlations among the different modes suggest that one can
generate more reliable behaviors by synchronizing stimuli to the state of the
worm in shape space. We confirm this prediction, effectively "steering" the
worm in real time.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 18:40:22 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 03:55:56 GMT"
}
] | 2016-01-05T00:00:00 | [
[
"Stephens",
"Greg J",
""
],
[
"Johnson-Kerner",
"Bethany",
""
],
[
"Bialek",
"William",
""
],
[
"Ryu",
"William S",
""
]
] |
0705.1549 | Pablo Parmezani Munhoz | P. P. Munhoz, F. L. Semi\~ao, A. Vidiella-Barranco, J. A. Roversi | Cluster-type entangled coherent states | Published in Phys. Lett. A | Phys. Lett. A 372 (2008) 3580-3585 | 10.1016/j.physleta.2008.02.009 | null | quant-ph | null | We present the cluster-type entangled coherent states (CTECS) and discuss
their properties. A cavity QED generation scheme using suitable choices of
atom-cavity interactions, obtained via detunings adjustments and the
application of classical external fields, is also presented. After the
realization of simple atomic measurements, CTECS representing nonlocal
electromagnetic fields in separate cavities can be generated.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 20:45:04 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 17:32:14 GMT"
},
{
"version": "v3",
"created": "Fri, 25 Apr 2008 03:44:03 GMT"
}
] | 2008-04-25T00:00:00 | [
[
"Munhoz",
"P. P.",
""
],
[
"Semião",
"F. L.",
""
],
[
"Vidiella-Barranco",
"A.",
""
],
[
"Roversi",
"J. A.",
""
]
] |
0705.1550 | Alexey Ferapontov V | D0 Collaboration, V. Abazov, et al | Zgamma production and limits on anomalous ZZgamma and Zgammagamma
couplings in ppbar collisions at sqrt(s) = 1.96 TeV | 8 pages, 6 figures. Published in Phys. Lett. B | Phys.Lett.B653:378-386,2007 | 10.1016/j.physletb.2007.08.035 | FERMILAB-PUB-07-117-E | hep-ex | null | We present a study of eegamma and mumugamma events using 1109 (1009) pb-1 of
data in the electron (muon) channel, respectively. These data were collected
with the D0 detector at the Fermilab Tevatron ppbar Collider at sqrt(s) = 1.96
TeV. Having observed 453 (515) candidates in the eegamma (mumugamma) final
state, we measure the Zgamma production cross section for a photon with
transverse energy ET > 7 GeV, separation between the photon and leptons Delta
R(lgamma) > 0.7, and invariant mass of the di-lepton pair M(ll) > 30 GeV/c^2,
to be 4.96 +/- 0.30(stat. + syst.) +/- 0.30(lumi.) pb, in agreement with the
standard model prediction of 4.74 +/- 0.22 pb. This is the most precise Zgamma
cross section measurement at a hadron collider. We set limits on anomalous
trilinear Zgammagamma and ZZgamma gauge boson couplings of -0.085 <
h(30)^(gamma) < 0.084, -0.0053 < h(40)^(gamma) < 0.0054 and -0.083 < h(30)^(Z)
< 0.082, -0.0053 < h(40)^(Z) < 0.0054 at the 95% C.L. for the form-factor scale
Lambda = 1.2 TeV.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 21:04:56 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2007 17:20:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"D0 Collaboration",
"",
""
],
[
"Abazov",
"V.",
""
]
] |
0705.1551 | Ann Merchant Boesgaard | Ann Merchant Boesgaard | Beryllium in Ultra-Lithium-Deficient Halo Stars - The Blue Straggler
Connection | 17 pages of text, 12 figures, 3 tables Submitted to ApJ | null | 10.1086/521075 | null | astro-ph | null | There are nine metal-deficient stars that have Li abundances well below the
Li plateau that is defined by over 100 unevolved stars with temperatures above
5800 K and values of [Fe/H] $<$ $-$1.0. Abundances of Be have been determined
for most of these ultra-Li-deficient stars in order to investigate the cause of
the Li deficiencies. High-resolution and high signal-to-noise spectra have been
obtained in the Be II spectral region near 3130 \AA for six ultra-Li-deficient
stars with the Keck I telescope and its new uv-sensitive CCD on the upgraded
HIRES. The spectrum synthesis technique has been used to determine Be
abundances. All six stars are found to have Be deficiencies also. Two have
measurable - but reduced - Be and four have only upper limits on Be. These
results are consistent with the idea that these Li- and Be-deficient stars are
analogous to blue stragglers. The stars have undergone mass transfer events (or
mergers) which destroy or dilute both Li and Be. The findings cannot be matched
by the models that predict that the deficiencies are due to extra-mixing in a
subset of halo stars that were initially rapid rotators, with the possible
exception of one star, G 139-8. Because the ultra-Li-deficient stars are also
Be-deficient, they appear to be genuine outliers in population of halo stars
used to determine the value of primordial Li; they no longer have the Li in
their atmospheres that was produced in the Big Bang.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 21:08:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Boesgaard",
"Ann Merchant",
""
]
] |
0705.1552 | George W. Patrick | G. W. Patrick, R. M. Roberts and C. Wulff | Stability transitions for axisymmetric relative equilibria of Euclidean
symmetric Hamiltonian systems | Minor revisions. Typographical errors corrected | Nonlinearity 21 325--352 2008 | 10.1088/0951-7715/21/2/008 | null | math-ph math.DS math.MP | null | In the presence of noncompact symmetry, the stability of relative equilibria
under momentum-preserving perturbations does not generally imply robust
stability under momentum-changing perturbations. For axisymmetric relative
equilibria of Hamiltonian systems with Euclidean symmetry, we investigate
different mechanisms of stability: stability by energy-momentum confinement,
KAM, and Nekhoroshev stability, and we explain the transitions between these.
We apply our results to the Kirchhoff model for the motion of an axisymmetric
underwater vehicle, and we numerically study dissipation induced instability of
KAM stable relative equilibria for this system.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 21:17:13 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 13:58:29 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Patrick",
"G. W.",
""
],
[
"Roberts",
"R. M.",
""
],
[
"Wulff",
"C.",
""
]
] |
0705.1553 | Feng Yuan | Harut Avakian, Stanley J. Brodsky, Alexandre Deur, Feng Yuan | Effect of Orbital Angular Momentum on Valence-Quark Helicity
Distributions | 10 pages, 3 eps figures | Phys.Rev.Lett.99:082001,2007 | 10.1103/PhysRevLett.99.082001 | RBRC-671, SLAC-PUB-12503 | hep-ph | null | We study the quark helicity distributions at large x in perturbative QCD,
taking into account contributions from the valence Fock states of the nucleon
which have nonzero orbital angular momentum. These states are necessary to have
a nonzero anomalous magnetic moment. We find that the quark orbital angular
momentum contributes a large logarithm to the negative helicity quark
distributions in addition to its power behavior, scaling as (1-x)^5\log^2(1-x)
in the limit of x\to 1. Our analysis shows that the ratio of the polarized over
unpolarized down quark distributions, \Delta d/d, will still approach 1 in this
limit. By comparing with the experimental data, we find that this ratio should
cross zero at x\approx 0.75.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 21:56:43 GMT"
},
{
"version": "v2",
"created": "Sun, 13 May 2007 03:56:18 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Avakian",
"Harut",
""
],
[
"Brodsky",
"Stanley J.",
""
],
[
"Deur",
"Alexandre",
""
],
[
"Yuan",
"Feng",
""
]
] |
0705.1554 | Pablo M. Saz Parkinson | A.A. Abdo, B.T. Allen, D. Berley, E. Blaufuss, S. Casanova, B.L.
Dingus, R.W. Ellsworth, M.M. Gonzalez, J.A. Goodman, E. Hays, C.M. Hoffman,
B.E. Kolterman, C.P. Lansdell, J.T. Linnemann, J.E. McEnery, A.I. Mincer, P.
Nemethy, D.Noyes, J.M. Ryan, F.W. Samuelson, P.M. Saz Parkinson, A. Shoup, G.
Sinnis, A.J. Smith, G.W. Sullivan, V. Vasileiou, G.P. Walker, D.A. Williams,
X.W. Xu and G.B. Yodh (Milagro Collaboration) | Milagro Constraints on Very High Energy Emission from Short Duration
Gamma-Ray Bursts | Accepted for publication in the Astrophysical Journal | Astrophys.J.666:361-367,2007 | 10.1086/519763 | null | astro-ph | null | Recent rapid localizations of short, hard gamma-ray bursts (GRBs) by the
Swift and HETE satellites have led to the observation of the first afterglows
and the measurement of the first redshifts from this type of burst. Detection
of >100 GeV counterparts would place powerful constraints on GRB mechanisms.
Seventeen short duration (< 5 s) GRBs detected by satellites occurred within
the field of view of the Milagro gamma-ray observatory between 2000 January and
2006 December. We have searched the Milagro data for >100 GeV counterparts to
these GRBs and find no significant emission correlated with these bursts. Due
to the absorption of high-energy gamma rays by the extragalactic background
light (EBL), detections are only expected for redshifts less than ~0.5. While
most long duration GRBs occur at redshifts higher than 0.5, the opposite is
thought to be true of short GRBs. Lack of a detected VHE signal thus allows
setting meaningful fluence limits. One GRB in the sample (050509b) has a likely
association with a galaxy at a redshift of 0.225, while another (051103) has
been tentatively linked to the nearby galaxy M81. Fluence limits are corrected
for EBL absorption, either using the known measured redshift, or computing the
corresponding absorption for a redshift of 0.1 and 0.5, as well as for the case
of z=0.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 21:53:35 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Abdo",
"A. A.",
"",
"Milagro Collaboration"
],
[
"Allen",
"B. T.",
"",
"Milagro Collaboration"
],
[
"Berley",
"D.",
"",
"Milagro Collaboration"
],
[
"Blaufuss",
"E.",
"",
"Milagro Collaboration"
],
[
"Casanova",
"S.",
"",
"Milagro Collaboration"
],
[
"Dingus",
"B. L.",
"",
"Milagro Collaboration"
],
[
"Ellsworth",
"R. W.",
"",
"Milagro Collaboration"
],
[
"Gonzalez",
"M. M.",
"",
"Milagro Collaboration"
],
[
"Goodman",
"J. A.",
"",
"Milagro Collaboration"
],
[
"Hays",
"E.",
"",
"Milagro Collaboration"
],
[
"Hoffman",
"C. M.",
"",
"Milagro Collaboration"
],
[
"Kolterman",
"B. E.",
"",
"Milagro Collaboration"
],
[
"Lansdell",
"C. P.",
"",
"Milagro Collaboration"
],
[
"Linnemann",
"J. T.",
"",
"Milagro Collaboration"
],
[
"McEnery",
"J. E.",
"",
"Milagro Collaboration"
],
[
"Mincer",
"A. I.",
"",
"Milagro Collaboration"
],
[
"Nemethy",
"P.",
"",
"Milagro Collaboration"
],
[
"Noyes",
"D.",
"",
"Milagro Collaboration"
],
[
"Ryan",
"J. M.",
"",
"Milagro Collaboration"
],
[
"Samuelson",
"F. W.",
"",
"Milagro Collaboration"
],
[
"Parkinson",
"P. M. Saz",
"",
"Milagro Collaboration"
],
[
"Shoup",
"A.",
"",
"Milagro Collaboration"
],
[
"Sinnis",
"G.",
"",
"Milagro Collaboration"
],
[
"Smith",
"A. J.",
"",
"Milagro Collaboration"
],
[
"Sullivan",
"G. W.",
"",
"Milagro Collaboration"
],
[
"Vasileiou",
"V.",
"",
"Milagro Collaboration"
],
[
"Walker",
"G. P.",
"",
"Milagro Collaboration"
],
[
"Williams",
"D. A.",
"",
"Milagro Collaboration"
],
[
"Xu",
"X. W.",
"",
"Milagro Collaboration"
],
[
"Yodh",
"G. B.",
"",
"Milagro Collaboration"
]
] |
0705.1555 | Denis Sheka | Jean-Guy Caputo, Yuri Gaididei, Volodymyr P. Kravchuk, Franz G.
Mertens and Denis D. Sheka | Effective anisotropy of thin nanomagnets: beyond the surface anisotropy
approach | ReVTeX, 14 pages, 6 figures | Phys. Rev. B 76, 174428 (2007) | 10.1103/PhysRevB.76.174428 | null | cond-mat.str-el | null | We study the effective anisotropy induced in thin nanomagnets by the nonlocal
demagnetization field (dipole-dipole interaction). Assuming a magnetization
independent of the thickness coordinate, we reduce the energy to an
inhomogeneneous onsite anisotropy. Vortex solutions exist and are ground states
for this model. We illustrate our approach for a disk and a square geometry. In
particular, we obtain good agreement between spin-lattice simulations with this
effective anisotropy and micromagnetic simulations.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 21:58:04 GMT"
},
{
"version": "v2",
"created": "Mon, 28 May 2007 22:56:16 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Caputo",
"Jean-Guy",
""
],
[
"Gaididei",
"Yuri",
""
],
[
"Kravchuk",
"Volodymyr P.",
""
],
[
"Mertens",
"Franz G.",
""
],
[
"Sheka",
"Denis D.",
""
]
] |
0705.1556 | Michael Norman | Michael L. Norman, Greg L. Bryan, Robert Harkness, James Bordner,
Daniel Reynolds, Brian O'Shea, and Rick Wagner | Simulating Cosmological Evolution with Enzo | 22 pages, 6 figures. To appear in Petascale Computing: Algorithms and
Applications, Ed. D. Bader, CRC Press LLC (2007) | null | null | null | astro-ph | null | In this paper we describe our massively parallel version of Enzo, a
multiphysics, parallel, AMR application for simulating cosmological structure
formation developed at UCSD and Columbia. We describe its physics, numerical
algorithms, implementation, and performance on current terascale platforms. We
also discuss our future plans and some of the challenges we face as we move to
the petascale.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 22:17:39 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Norman",
"Michael L.",
""
],
[
"Bryan",
"Greg L.",
""
],
[
"Harkness",
"Robert",
""
],
[
"Bordner",
"James",
""
],
[
"Reynolds",
"Daniel",
""
],
[
"O'Shea",
"Brian",
""
],
[
"Wagner",
"Rick",
""
]
] |
0705.1557 | Alexander Westphal | Alexander Westphal | Lifetime of Stringy de Sitter Vacua | 1+16 pages, 2 figures, LaTeX, uses JHEP3 class, v2: references added,
inclusion of an additional subclass of de Sitter vacua | JHEP 0801:012,2008 | 10.1088/1126-6708/2008/01/012 | SISSA-30/2007/EP | hep-th astro-ph hep-ph | null | In this note we perform a synopsis of the life-times from vacuum decay of
several de Sitter vacuum constructions in string/M-theory which have a single
dS minimum arising from lifting a pre-existing AdS extremum and no other local
minima existent after lifting. For these vacua the decay proceeds via a
Coleman--De Luccia instanton towards the universal Minkowski minimum at
infinite volume. This can be calculated using the thin--wall approximation,
provided the cosmological constant of the local dS minimum is tuned
sufficiently small. We compare the estimates for the different model classes
and find them all stable in the sense of exponentially long life times as long
as they have a very small cosmological constant and a scale of supersymmetry
breaking > TeV.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 22:03:13 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 21:10:23 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Westphal",
"Alexander",
""
]
] |
0705.1558 | Kristopher Yirak | Kristopher Yirak, Adam Frank, Andrew Cunningham, and Sorin Mitran | The Interaction Between a Pulsed Astrophysical Jet and Small-Scale
Heterogeneous Media | 23 pages, 11 figures; submitted to ApJ | null | 10.1086/523955 | null | astro-ph | null | We have performed 2D hydrodynamic simulations of a pulsed astrophysical jet
propagating through a medium that is populated with spherical inhomogeneities,
or "clumps," which are smaller than the jet radius. The clumps are seen to
affect the jet in several ways, such as impeding jet propagation and deflecting
the jet off-axis. While there has been some debate as to the prevalence of
these types of condensations in the ISM or in molecular clouds, the exploration
of this region of parameter space nonetheless both shows the potential for
these clumps to disrupt astrophysical jets and yields results which recover
aspects of recent observations of Herbig-Haro objects. We find that the
propagation of the jet and the vorticity induced in the clump/ambient medium
correlate well with a "dynamic filling function" $f_d$ across all the
simulations.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 22:09:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yirak",
"Kristopher",
""
],
[
"Frank",
"Adam",
""
],
[
"Cunningham",
"Andrew",
""
],
[
"Mitran",
"Sorin",
""
]
] |
0705.1559 | Falko Ziebert | Falko Ziebert, Igor S. Aranson, and Lev S. Tsimring | Effects of crosslinks on motor-mediated filament organization | 15 pages, 5 figures, submitted to New. J. Phys | New J. Phys. 9, 421 (2007) | 10.1088/1367-2630/9/11/421 | null | cond-mat.soft | null | Crosslinks and molecular motors play an important role in the organization of
cytoskeletal filament networks. Here we incorporate the effect of crosslinks
into our model of polar motor-filament organization [Phys. Rev. E {\bf 71},
050901 (2005)], through suppressing the relative sliding of filaments in the
course of motor-mediated alignment. We show that this modification leads to a
nontrivial macroscopic behavior, namely the oriented state exhibits a
transverse instability in contrast to the isotropic instability that occurs
without crosslinks. This transverse instability leads to the formation of dense
extended bundles of oriented filaments, similar to recently observed structures
in actomyosin. This model also can be applied to situations with two oppositely
directed motor species or motors with different processing speeds.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 22:21:43 GMT"
}
] | 2011-03-01T00:00:00 | [
[
"Ziebert",
"Falko",
""
],
[
"Aranson",
"Igor S.",
""
],
[
"Tsimring",
"Lev S.",
""
]
] |
0705.1560 | Man-Hong Yung | Man-Hong Yung | Spin Star as Switch for Quantum Networks | 10 pages, 2 figure | J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 135504 | 10.1088/0953-4075/44/13/135504 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum state transfer is an important task in quantum information
processing. It is known that one can engineer the couplings of a
one-dimensional spin chain to achieve the goal of perfect state transfer. To
leverage the value of these spin chains, a spin star is potentially useful for
connecting different parts of a quantum network. In this work, we extend the
spin-chain engineering problem to the problems with a topology of a star
network. We show that a permanently coupled spin star can function as a network
switch for transferring quantum states selectively from one node to another by
varying the local potentials only. Together with one-dimensional chains, this
result allows applications of quantum state transfer be applied to more general
quantum networks.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 22:23:24 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Jun 2011 14:20:18 GMT"
}
] | 2016-10-05T00:00:00 | [
[
"Yung",
"Man-Hong",
""
]
] |
0705.1561 | Leonard Parker | Xing Huang and Leonard Parker | Graviton Propagator in a Covariant Massive Gravity Theory | 7 pages. Submitted to Physical Review D | null | null | null | hep-th | null | We study the massive gravity theory proposed by Arkani-Hamed, Georgi and
Schwartz. In this theory, the graviton becomes massive when general covariance
is spontaneously broken through the introduction of a field that links two
metrics, one of the which will eventually decouple. The excitation of this
"link" field acts like a Goldstone boson in giving mass to the graviton. We
work out the graviton and Goldstone boson propagators explicitly by means of
gauge fixing terms similar to the renormalizability gauges used in gauge
theories. With these propagators, we calculate the lowest order tree-level
interaction between two external energy momentum tensors. The result is
independent of the gauge parameter, but different from the prediction of
massless gravity theory, i.e., general relativity. This difference remains even
if the mass of the graviton goes to zero, in which case it gives the van
Dam-Veltman-Zakharov (vDVZ) discontinuity between the propagators of a massive
and massless linearized graviton. Moreover, we show that the Fierz-Pauli
graviton mass term can be considered as the ``unitary gauge'' of a more general
theory with an extra scalar field. We explicitly construct such a theory in
which the vDVZ discontinuity arises with a graviton mass term that is different
from the Fierz-Pauli mass term. This theory has a local Weyl symmetry under
conformal transformations of the metric. In the case when the mass goes to
zero, the Weyl summetry becomes a global symmetry. It is possible that the
local Weyl symmetry will give a hint as to the form of the corresponding fully
nonlinear theory having a nonzero graviton mass.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 22:23:38 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Huang",
"Xing",
""
],
[
"Parker",
"Leonard",
""
]
] |
0705.1562 | Lionel Levine | Itamar Landau and Lionel Levine | The Rotor-Router Model on Regular Trees | v2 incorporates referee comments, clarifies that the results of
section 2 apply also to multigraphs | Journal of Combinatorial Theory, Series A 116(2), 421--433, 2009 | 10.1016/j.jcta.2008.05.012 | null | math.CO math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rotor-router model is a deterministic analogue of random walk. It can be
used to define a deterministic growth model analogous to internal DLA. We show
that the set of occupied sites for this model on an infinite regular tree is a
perfect ball whenever it can be, provided the initial rotor configuration is
acyclic (that is, no two neighboring vertices have rotors pointing to one
another). This is proved by defining the rotor-router group of a graph, which
we show is isomorphic to the sandpile group. We also address the question of
recurrence and transience: We give two rotor configurations on the infinite
ternary tree, one for which chips exactly alternate escaping to infinity with
returning to the origin, and one for which every chip returns to the origin.
Further, we characterize the possible "escape sequences" for the ternary tree,
that is, binary words a_1 ... a_n for which there exists a rotor configuration
so that the k-th chip escapes to infinity if and only if a_k=1.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 22:34:39 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jul 2008 17:19:27 GMT"
}
] | 2010-10-11T00:00:00 | [
[
"Landau",
"Itamar",
""
],
[
"Levine",
"Lionel",
""
]
] |
0705.1563 | Pascale Garaud | P. Garaud | Growth and migration of solids in evolving protostellar disks I: Methods
and Analytical tests | Submitted to ApJ. 23 pages and 13 figures | null | 10.1086/523090 | null | astro-ph | null | This series of papers investigates the early stages of planet formation by
modeling the evolution of the gas and solid content of protostellar disks from
the early T Tauri phase until complete dispersal of the gas. In this first
paper, I present a new set of simplified equations modeling the growth and
migration of various species of grains in a gaseous protostellar disk evolving
as a result of the combined effects of viscous accretion and photo-evaporation
from the central star. Using the assumption that the grain size distribution
function always maintains a power-law structure approximating the average
outcome of the exact coagulation/shattering equation, the model focuses on the
calculation of the growth rate of the largest grains only. The coupled
evolution equations for the maximum grain size, the surface density of the gas
and the surface density of solids are then presented and solved
self-consistently using a standard 1+1 dimensional formalism. I show that the
global evolution of solids is controlled by a leaky reservoir of small grains
at large radii, and propose an empirically derived evolution equation for the
total mass of solids, which can be used to estimate the total heavy element
retention efficiency in the planet formation paradigm. Consistency with
observation of the total mass of solids in the Minimum Solar Nebula augmented
with the mass of the Oort cloud sets strong upper limit on the initial grain
size distribution, as well as on the turbulent parameter $\alphat$. Detailed
comparisons with SED observations are presented in a following paper.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 22:53:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Garaud",
"P.",
""
]
] |
0705.1564 | Daowen Qiu | Hongfeng Gan and Daowen Qiu | Unambiguous discrimination between mixed quantum states based on
programmable quantum state discriminators | 5 pages; comments are welcome | null | null | null | quant-ph | null | We discuss the problem of designing an unambiguous programmable discriminator
for mixed quantum states. We prove that there does not exist such a universal
unambiguous programmable discriminator for mixed quantum states that has two
program registers and one data register. However, we find that we can use the
idea of programmable discriminator to unambiguously discriminate mixed quantum
states. The research shows that by using such an idea, when the success
probability for discrimination reaches the upper bound, the success probability
is better than what we do not use the idea to do, except for some special
cases.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 23:02:01 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gan",
"Hongfeng",
""
],
[
"Qiu",
"Daowen",
""
]
] |
0705.1565 | Christopher Eling | Christopher Eling, Ted Jacobson, M. Coleman Miller | Neutron stars in Einstein-aether theory | 25 pages, 4 figures; v2: simplified the discussion of aether-matter
couplings, removed one extraneous mass vs. pressure plot, added brief
discussion of ae-theory effects in Ozel's mass determination method; v3:
corrected the equation for aether stress tensor, results unchanged since
correct form was used in calculations | Phys.Rev.D76:042003,2007; Erratum-ibid.D80:129906,2009 | 10.1103/PhysRevD.76.042003 10.1103/PhysRevD.80.129906 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As current and future experiments probe strong gravitational regimes around
neutron stars and black holes, it is desirable to have theoretically sound
alternatives to general relativity against which to test observations. Here we
study the consequences of one such generalization, Einstein-aether theory, for
the properties of non-rotating neutron stars. This theory has a parameter range
that satisfies all current weak-field tests. We find that within this range it
leads to lower maximum neutron star masses, as well as larger surface redshifts
at a particular mass, for a given nuclear equation of state. For non-rotating
black holes and neutron stars, the innermost stable circular orbit is only
slightly modified in this theory.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 23:16:38 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 20:01:02 GMT"
},
{
"version": "v3",
"created": "Sun, 6 Dec 2009 14:19:48 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Eling",
"Christopher",
""
],
[
"Jacobson",
"Ted",
""
],
[
"Miller",
"M. Coleman",
""
]
] |
0705.1566 | Erez Berg | Erez Berg and Ehud Altman | Evolution of the Fermi surface in phase fluctuating d-wave
superconductors | Journal ref. added | PRL 99, 247001 (2007) | 10.1103/PhysRevLett.99.247001 | null | cond-mat.supr-con cond-mat.str-el | null | One of the most puzzling aspects of the high $T_c$ superconductors is the
appearance of Fermi arcs in the normal state of the underdoped cuprate
materials. These are loci of low energy excitations covering part of the fermi
surface, that suddenly appear above $T_c$ instead of the nodal quasiparticles.
Based on a semiclassical theory, we argue that partial Fermi surfaces arise
naturally in a d-wave superconductor that is destroyed by thermal phase
fluctuations. Specifically, we show that the electron spectral function
develops a square root singularity at low frequencies for wave-vectors
positioned on the bare Fermi surface. We predict a temperature dependence of
the arc length that can partially account for results of recent angle resolved
photo emission (ARPES) experiments.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 23:33:54 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Dec 2007 21:55:53 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Berg",
"Erez",
""
],
[
"Altman",
"Ehud",
""
]
] |
0705.1567 | Andrew Francis | Andrew Francis and Lenny Jones | On the square root of the centre of the Hecke algebra of type A | null | J. Aust. Math. Soc., 82 (2007), 209-220 | null | null | math.RT math.RA | null | In this paper we investigate non-central elements of the Iwahori-Hecke
algebra of the symmetric group whose squares are central.
In particular, we describe a commutative subalgebra generated by certain
non-central square roots of central elements, and the generic existence of a
rank-three submodule of the Hecke algebra contained in the square root of the
centre but not in the centre. The generators for this commutative subalgebra
include the longest word and elements related to trivial and sign characters of
the Hecke algebra. We find elegant expressions for the squares of such
generators in terms of both the minimal basis of the centre and the elementary
symmetric functions of Murphy elements.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 23:40:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Francis",
"Andrew",
""
],
[
"Jones",
"Lenny",
""
]
] |
0705.1568 | Peter Bokes | P. Bokes, J. Jung, and R. W. Godby | Ab-initio formulation of the 4-point conductance of interacting
electronic systems | null | Phys. Rev. B 76, 125433 (2007) | 10.1103/PhysRevB.76.125433 | null | cond-mat.mtrl-sci cond-mat.mes-hall | null | We derive an expression for the 4-point conductance of a general quantum
junction in terms of the density response function. Our formulation allows us
to show that the 4-point conductance of an interacting electronic system
possessing either a geometrical constriction and/or an opaque barrier becomes
identical to the macroscopically measurable 2-point conductance. Within
time-dependent density-functional theory the formulation leads to a direct
identification of the functional form of the exchange-correlation kernel that
is important for the conductance. We demonstrate the practical implementationof
our formula for a metal-vacuum-metal interface.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 23:41:18 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 13:10:21 GMT"
}
] | 2007-10-04T00:00:00 | [
[
"Bokes",
"P.",
""
],
[
"Jung",
"J.",
""
],
[
"Godby",
"R. W.",
""
]
] |
0705.1569 | Reg Cahill | Reginald T Cahill (Flinders University) | Dynamical 3-Space: Supernovae and the Hubble Expansion - Older Universe
and End of Dark Energy | 19 pages 9 Figures. Gamma-ray burst data included. Universe age
correction | Progress in Physics, vol. 4, 9-12, 2007. | null | null | physics.gen-ph | null | We apply the new dynamics of 3-space to cosmology by deriving a Hubble
expansion solution. This dynamics involves two constants; G and alpha - the
fine structure constant. This solution gives an excellent parameter-free fit to
the recent supernova and gamma-ray burst data without the need for `dark
energy' or `dark matter'. The data and theory together imply an older age for
the universe of some 14.7Gyrs. Various problems such as fine tuning, the event
horizon problem etc are now resolved. A brief review discusses the origin of
the 3-space dynamics and how that dynamics explained the bore hole anomaly,
spiral galaxy flat rotation speeds, the masses of black holes in spherical
galaxies, gravitational light bending and lensing, all without invoking `dark
matter' or `dark energy'. These developments imply that a new understanding of
the universe is now available.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 00:14:48 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 03:09:39 GMT"
},
{
"version": "v3",
"created": "Tue, 5 Jun 2007 23:42:40 GMT"
}
] | 2007-06-27T00:00:00 | [
[
"Cahill",
"Reginald T",
"",
"Flinders University"
]
] |
0705.1570 | Andrey Shoom A | Valeri P. Frolov and Andrey A. Shoom | Interior of Distorted Black Holes | 12 pages, 16 figures | Phys.Rev.D76:064037,2007 | 10.1103/PhysRevD.76.064037 | null | gr-qc hep-th | null | We study the interior of distorted static axisymmetric black holes. We obtain
a general interior solution and study its asymptotics both near the horizon and
singularity. As a special example, we apply the obtained results to the case of
the so-called `caged' black holes.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 00:05:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Frolov",
"Valeri P.",
""
],
[
"Shoom",
"Andrey A.",
""
]
] |
0705.1571 | Zhen-Hua Zhao | Zhen-Hua Zhao, Yu-Xiao Liu, Xi-Guo Li | The Energy-Level Shifts of a Stationary Hydrogen Atom in Static External
Gravitational Field with Schwarzschild Geometry | 11 pages | Phys.Rev.D76:064016,2007 | 10.1103/PhysRevD.76.064016 | null | gr-qc | null | The first order perturbations of the energy levels of a stationary hydrogen
atom in static external gravitational field, with Schwarzschild metric, are
investigated. The energy shifts are calculated for the relativistic 1S, 2S, 2P,
3S, 3P, 3D, 4S, 4P, 4D and 4F levels. The results show that the energy-level
shifts of the states with total angular momentum quantum number 1/2 are all
zero, and the ratio of absolute energy shifts with total angular momentum
quantum number 5/2 is 1:4:5. This feature can be used to help us to distinguish
the gravitational effect from other effect.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 07:29:00 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 23:46:49 GMT"
},
{
"version": "v3",
"created": "Thu, 19 Jul 2007 01:57:04 GMT"
},
{
"version": "v4",
"created": "Mon, 17 Sep 2007 07:10:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zhao",
"Zhen-Hua",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Li",
"Xi-Guo",
""
]
] |
0705.1572 | Duncan Brown | Duncan A. Brown, Stanislav Babak, Patrick R. Brady, Nelson
Christensen, Thomas Cokelaer, Jolien D. E. Creighton, Stephen Fairhurst,
Gabriela Gonzalez, Eirini Messaritaki, B. S. Sathyaprakash, Peter Shawhan,
Natalia Zotov | Searching for Gravitational Waves from Binary Inspirals with LIGO | 9 pages, 2 figures. Published in proceedings of the 8th Gravitational
Wave Data Analysis Workshop, Milwaukee, WI, USA, 17-20 December 2003 | Class.Quant.Grav.21:S1625-S1633,2004 | 10.1088/0264-9381/21/20/005 | null | gr-qc | null | We describe the current status of the search for gravitational waves from
inspiralling compact binary systems in LIGO data. We review the result from the
first scientific run of LIGO (S1). We present the goals of the search of data
taken in the second scientific run (S2) and describe the differences between
the methods used in S1 and S2.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 01:25:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brown",
"Duncan A.",
""
],
[
"Babak",
"Stanislav",
""
],
[
"Brady",
"Patrick R.",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Cokelaer",
"Thomas",
""
],
[
"Creighton",
"Jolien D. E.",
""
],
[
"Fairhurst",
"Stephen",
""
],
[
"Gonzalez",
"Gabriela",
""
],
[
"Messaritaki",
"Eirini",
""
],
[
"Sathyaprakash",
"B. S.",
""
],
[
"Shawhan",
"Peter",
""
],
[
"Zotov",
"Natalia",
""
]
] |
0705.1573 | Matthias Burkardt | Matthias Burkardt and Brian Hannafious | Are all Boer-Mulders functions alike? | 8 pages, 1 figure | Phys.Lett.B658:130-137,2008 | 10.1016/j.physletb.2007.09.064 | null | hep-ph | null | Chirally odd generalized parton distributions (GPDs) and the Boer-Mulders
function provide valuable information about spin-orbit correlations for quarks
in nucleons and other hadrons. We compare results for the relevant GPD
$\bar{E}^q_T$ from a variety of phenomenological models as well as recent
lattice results. We find that $\bar{E}^q_T>0$ for nucleons as well as the pion
and for both $u$ and $d$ quark. As a result, the corresponding Boer Mulders
functions are all expected to be negative. The sign of $\bar{E}^q_T$ arises
from the relative sign between the upper and lower Dirac components for the
quark wave functions.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 01:27:47 GMT"
},
{
"version": "v2",
"created": "Sun, 13 May 2007 01:28:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Burkardt",
"Matthias",
""
],
[
"Hannafious",
"Brian",
""
]
] |
0705.1574 | David Kribs | Cedric Beny, Achim Kempf, and David W. Kribs | Quantum Error Correction of Observables | 22 pages, 1 figure, preprint version | Phys. Rev. A 76, 042303 (2007) | 10.1103/PhysRevA.76.042303 | null | quant-ph | null | A formalism for quantum error correction based on operator algebras was
introduced in [1] via consideration of the Heisenberg picture for quantum
dynamics. The resulting theory allows for the correction of hybrid
quantum-classical information and does not require an encoded state to be
entirely in one of the corresponding subspaces or subsystems. Here, we provide
detailed proofs for the results of [1], derive a number of new results, and we
elucidate key points with expanded discussions. We also present several
examples and indicate how the theory can be extended to operator spaces and
general positive operator-valued measures.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 02:37:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Beny",
"Cedric",
""
],
[
"Kempf",
"Achim",
""
],
[
"Kribs",
"David W.",
""
]
] |
0705.1575 | Yue-Liang Wu | Fang Su, Yue-Liang Wu, Ya-Dong Yang, and Ci Zhuang | QCD Approach to B->D \pi Decays and CP Violation | 21pages,5 figures,3 tables, typos corrected and numerical result for
one of decay channels is improved | Commun.Theor.Phys.49:707-716,2008 | 10.1088/0253-6102/49/3/39 | null | hep-ph | null | The branching ratios and CP violations of the $B\to D\pi$ decays, including
both the color-allowed and the color-suppressed modes, are investigated in
detail within QCD framework by considering all diagrams which lead to three
effective currents of two quarks. An intrinsic mass scale as a dynamical gluon
mass is introduced to treat the infrared divergence caused by the soft
collinear approximation in the endpoint regions, and the Cutkosky rule is
adopted to deal with a physical-region singularity of the on mass-shell quark
propagators. When the dynamical gluon mass $\mu_g$ is regarded as a universal
scale, it is extracted to be around $\mu_g = 440$ MeV from one of the
well-measured $B\to D\pi$ decay modes. The resulting predictions for all
branching ratios are in agreement with the current experimental measurements.
As these decays have no penguin contributions, there are no direct $CP$
asymmetries. Due to interference between the Cabibbo-suppressed and the
Cabibbo-favored amplitudes, mixing-induced CP violations are predicted in the
$B\to D^{\pm}\pi^{\mp}$ decays to be consistent with the experimental data at
1-$\sigma$ level. More precise measurements will be helpful to extract weak
angle $2\beta+\gamma$.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 02:38:19 GMT"
},
{
"version": "v2",
"created": "Wed, 14 Nov 2007 05:32:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Su",
"Fang",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Yang",
"Ya-Dong",
""
],
[
"Zhuang",
"Ci",
""
]
] |
0705.1576 | Shuichiro Takeda | Wee Teck Gan and Shuichiro Takeda | On Shalika Periods and a Theorem of Jacquet-Martin | null | null | null | null | math.NT math.RT | null | Let \pi be a cuspidal automorphic representation of GL_4 with central
character \mu^2. It is known that \pi has Shalika period with respect to \mu if
and only if the L-function L^S(s, \pi, \bigwedge^2\otimes\mu^{-1}) has a pole
at s=1. Recentlt, Jacquet and Martin considered the analogous question for
cuspidal representations \pi_D of the inner form GL_2(D)(\A), and obtained a
partial result via the relative trace formula. In this paper, we provide a
complete solution to this problem via the method of theta correspondence, and
give necessary and sufficient conditions for the existence of Shalika period
for \pi_D. We also resolve the analogous question in the local setting.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 03:05:33 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Jun 2007 07:04:27 GMT"
},
{
"version": "v3",
"created": "Sun, 18 May 2008 14:14:40 GMT"
}
] | 2008-05-18T00:00:00 | [
[
"Gan",
"Wee Teck",
""
],
[
"Takeda",
"Shuichiro",
""
]
] |
0705.1577 | Shuang-Yong Zhou | Shuang-Yong Zhou | A New Approach to Quintessence and a Solution of Multiple Attractors | 6 pages, 2 figures, Revtex4; To appear in PLB | Phys.Lett.B660:7-12,2008 | 10.1016/j.physletb.2007.12.020 | null | astro-ph gr-qc | null | We take a new approach to construct Quintessential models. With this
approach, we first easily obtain a tracker solution that is different from
those discovered before and straightforwardly find a solution of multiple
attractors, i.e., a solution with more than one attractor for a given set of
parameters. Then we propose a scenario of Quintessence where the field jumps
out of the scaling attractor to the de-Sitter-like attractor, by introducing a
field whose value changes a certain amount in a short time, leading to the
current acceleration. We also calculate the change the field needs for a
successful jump and suggest a possible mechanism that involves spontaneous
symmetry breaking to realize the sudden change of the field value.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 04:58:06 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Jun 2007 08:42:36 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Dec 2007 03:05:30 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Zhou",
"Shuang-Yong",
""
]
] |
0705.1578 | Yuri Lyubich | Yuri I. Lyubich | Axiomatic theory of divergent series and cohomological equations | null | null | null | null | math.FA math.CA | null | A general theory of summation of divergent series based on the
Hardy-Kolmogorov axioms is developed. A class of functional series is
investigated by means of ergodic theory. The results are formulated in terms of
solvability of some cohomological equations, all solutions to which are
nonmeasurable. In particular, this realizes a construction of a nonmeasurable
function as first conjectured by Kolmogorov.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 03:51:19 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Nov 2007 20:44:02 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Lyubich",
"Yuri I.",
""
]
] |
0705.1579 | Isao Maruyama | Hui Song, Isao Maruyama, Yasuhiro Hatsugai | Levitation and percolation in quantum Hall systems with correlated
disorder | null | null | 10.1103/PhysRevB.76.132202 | null | cond-mat.mes-hall cond-mat.dis-nn | null | We investigate the integer quantum Hall system in a two dimensional lattice
model with spatially correlated disorder by using the efficient method to
calculate the Chern number proposed by Fukui \textit{et al}. Distribution of
charge density indicates that the extended states at the center of each Landau
band have percolating current paths, which are topologically equivalent to the
edge states that exist in a system with boundaries. As increasing the strength
of disorder, floating feature is observed in an averaged Hall conductance as a
function of filling factor. Its relation to the observed experiments is also
discussed.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 03:51:55 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 23:52:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Song",
"Hui",
""
],
[
"Maruyama",
"Isao",
""
],
[
"Hatsugai",
"Yasuhiro",
""
]
] |
0705.1580 | Ranjan Gupta | D.B. Vaidya, Ranjan Gupta and T.P. Snow | Composite Interstellar Grains | 11 pages, 12 figures, 5 tables To appear in 2007 MNRAS | Mon.Not.Roy.Astron.Soc.379:791-800,2007 | 10.1111/j.1365-2966.2007.11975.x | null | astro-ph | null | The composite grain is made up of a host silicate spheroid and graphite
inclusions. The extinction efficiencies of the composite spheroidal grains for
three axial ratios are computed using the discrete dipole approximation (DDA).
The interstellar extinction curve is evaluated in the spectral region
3.40--0.10$\mu m$ using the extinction efficiencies of the composite spheroidal
grains. The model extinction curves are then compared with the average observed
interstellar extinction curve. We also calculate the linear polarization for
the spheroidal composite grains at three orientation angles and find the
wavelength of maximum polarization. Further, we estimate the volume extinction
factor, an important parameter from the point of view of cosmic abundance, for
the composite grain models that reproduce the average observed interstellar
extinction. The estimated abundances derived from the composite grain models
for both carbon and silicon are found to be lower than that are predicted by
the bare silicate/graphite grain models but these values are still higher than
that are implied from the recent ISM values.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 03:54:41 GMT"
},
{
"version": "v2",
"created": "Mon, 14 May 2007 06:29:50 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Vaidya",
"D. B.",
""
],
[
"Gupta",
"Ranjan",
""
],
[
"Snow",
"T. P.",
""
]
] |
0705.1581 | Andrew Francis | Andrew Francis and Lenny Jones | A new integral basis for the centre of the Hecke algebra of type A | 13 pages | null | null | null | math.RT math.CO math.GR | null | We describe a recursive algorithm that produces an integral basis for the
centre of the Hecke algebra of type A consisting of linear combinations of
monomial symmetric polynomials of Jucys--Murphy elements. We also discuss the
existence of integral bases for the centre of the Hecke algebra that consist
solely of monomial symmetric polynomials of Jucys--Murphy elements. Finally,
for n=3, we show that only one such basis exists for the centre of the Hecke
algebra, by proving that there are exactly four bases for the centre of the
corresponding symmetric group algebra which consist solely of monomial
symmetric polynomials of Jucys--Murphy elements.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 03:57:28 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Francis",
"Andrew",
""
],
[
"Jones",
"Lenny",
""
]
] |
0705.1582 | Cong Ren | Cong Ren, J. Trbovic, R. L. Kallaher, J. G. Braden, J.S. Parker, S.
von Moln\'ar, and P. Xiong | Measurement of the spin polarization of the magnetic semiconductor EuS
with zero-field and Zeeman-split Andreev reflection spectroscopy | 6 pages, 4 figures | null | 10.1103/PhysRevB.75.205208 | null | cond-mat.mtrl-sci cond-mat.supr-con | null | We report measurements of the spin polarization (\textbf{\textit{P}}) of the
concentrated magnetic semiconductor EuS using both zero-field and Zeeman-split
Andreev reflection spectroscopy (ARS) with EuS/Al planar junctions. The
zero-field ARS spectra are well described by the modified (spin-polarized) BTK
model with expected superconducting energy gap and actual measurement
temperature (no additional spectral broadening). The fittings consistently
yield \textbf{\textit{P}} close to 80% regardless of the barrier strength.
Moreover, we performed ARS in the presence of a Zeeman-splitting of the
quasiparticle density of states in Al. To describe the Zeeman-split ARS
spectra, we develop a theoretical model which incorporates the solution to the
Maki-Fulde equations into the modified BTK analysis. The method enables the
determination of the magnitude as well as the sign of \textbf{\textit{P}} with
ARS, and the results are consistent with those from the zero-field ARS. The
experiments extend the utility of field-split superconducting spectroscopy from
tunnel junctions to Andreev junctions of arbitrary barrier strengths.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 04:30:42 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Ren",
"Cong",
""
],
[
"Trbovic",
"J.",
""
],
[
"Kallaher",
"R. L.",
""
],
[
"Braden",
"J. G.",
""
],
[
"Parker",
"J. S.",
""
],
[
"von Molnár",
"S.",
""
],
[
"Xiong",
"P.",
""
]
] |
0705.1583 | Sourav Dhar | Sourav Dhar and Rabindranath Bera | Wireless Networking to Support Data and Voice Communication Using Spread
Spectrum Technology in The Physical Layer | international conference on information technology, March 2007. 7
pages,4 figures, 2 tables | null | null | null | cs.NI | null | Wireless networking is rapidly growing and becomes an inexpensive technology
which allows multiple users to simultaneously access the network and the
internet while roaming about the campus. In the present work, the software
development of a wireless LAN(WLAN) is highlighted. This WLAN utilizes direct
sequence spread spectrum (DSSS) technology at 902MHz RF carrier frequency in
its physical layer. Cost effective installation and antijaming property of
spread spectrum technology are the major advantages of this work.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 04:41:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Dhar",
"Sourav",
""
],
[
"Bera",
"Rabindranath",
""
]
] |
0705.1584 | Raymond R. Volkas | Rhys Davies, Damien P. George, Raymond R. Volkas | The standard model on a domain-wall brane? | 7 pages, 2 figures. This version to appear in PRD. Significant added
discussion on the Dvali-Shifman mechanism, mode-analyses and the effect of
warped gravity. Added references | Phys.Rev.D77:124038,2008 | 10.1103/PhysRevD.77.124038 | null | hep-ph hep-th | null | We propose a 4+1-dimensional action that is a candidate for realising a
standard-model-like effective theory for fields dynamically localised to a
domain-wall brane. Our construction is based in part on the conjecture that the
Dvali-Shifman mechanism for dynamically localising gauge bosons works correctly
in 4+1-d. Assuming this to be so, we require the gauge symmetry to be SU(5)in
the bulk, spontaneously breaking to SU(3)xSU(2)xU(1) inside the domain wall,
thus dynamically localising the standard model gauge bosons provided that the
SU(5) theory in the bulk exhibits confinement. The wall is created jointly by a
real singlet-Higgs field eta configured as a kink, and an SU(5) adjoint-Higgs
field chi that takes nonzero values inside the wall. Chiral 3+1-dimensional
quarks and leptons are confined and split along the bulk direction via their
Yukawa couplings to eta and chi. The Higgs doublet and its colour triplet SU(5)
partner are similarly localised and split. The splittings suppress
coloured-Higgs-induced proton decay and, because of the different localisation
profiles, the usual SU(5) mass relation m_e = m_d does not arise. Localised
gravity is generated via the Randall-Sundrum alternative to compactification.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 04:53:15 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Dec 2007 01:00:04 GMT"
},
{
"version": "v3",
"created": "Thu, 29 May 2008 03:20:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Davies",
"Rhys",
""
],
[
"George",
"Damien P.",
""
],
[
"Volkas",
"Raymond R.",
""
]
] |
0705.1585 | Tshilidzi Marwala | Unathi Mahola, Fulufhelo V. Nelwamondo, Tshilidzi Marwala | HMM Speaker Identification Using Linear and Non-linear Merging
Techniques | 6 pages | null | null | null | cs.LG | null | Speaker identification is a powerful, non-invasive and in-expensive biometric
technique. The recognition accuracy, however, deteriorates when noise levels
affect a specific band of frequency. In this paper, we present a sub-band based
speaker identification that intends to improve the live testing performance.
Each frequency sub-band is processed and classified independently. We also
compare the linear and non-linear merging techniques for the sub-bands
recognizer. Support vector machines and Gaussian Mixture models are the
non-linear merging techniques that are investigated. Results showed that the
sub-band based method used with linear merging techniques enormously improved
the performance of the speaker identification over the performance of wide-band
recognizers when tested live. A live testing improvement of 9.78% was achieved
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 04:54:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mahola",
"Unathi",
""
],
[
"Nelwamondo",
"Fulufhelo V.",
""
],
[
"Marwala",
"Tshilidzi",
""
]
] |
0705.1586 | Jeong-Hyuck Park | Johanna Erdmenger, Rene Meyer, Jeong-Hyuck Park | Spacetime Emergence in the Robertson-Walker Universe from a Matrix model | 4 pages - accepted for publication in Physical Review Letters | Phys.Rev.Lett.98:261301,2007 | 10.1103/PhysRevLett.98.261301 | MPP-2007-5 | hep-th gr-qc | null | Using a novel, string theory-inspired formalism based on a Hamiltonian
constraint, we obtain a conformal mechanical system for the spatially flat
four-dimensional Robertson-Walker Universe. Depending on parameter choices,
this system describes either a relativistic particle in the Robertson-Walker
background, or metric fluctuations of the Robertson-Walker geometry. Moreover
we derive a tree-level M-theory matrix model in this time-dependent background.
Imposing the Hamiltonian constraint forces the spacetime geometry to be fuzzy
near the big bang, while the classical Robertson-Walker geometry emerges as the
Universe expands. From our approach we also derive the temperature of the
Universe interpolating between the radiation and matter dominated eras.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 05:25:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Erdmenger",
"Johanna",
""
],
[
"Meyer",
"Rene",
""
],
[
"Park",
"Jeong-Hyuck",
""
]
] |
0705.1587 | Elliott H. Lieb | Rupert L. Frank, Elliott H. Lieb, Robert Seiringer, Heinz Siedentop | Mueller's Exchange-Correlation Energy in Density-Matrix-Functional
Theory | Latex, 42 pages, 1 figure. Minor error in the proof of Prop. 2
corrected | Phys. Rev. A 76, 052517 (2007) | 10.1103/PhysRevA.76.052517 | null | cond-mat.str-el cond-mat.mtrl-sci math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The increasing interest in the Mueller density-matrix-functional theory has
led us to a systematic mathematical investigation of its properties. This
functional is similar to the Hartree-Fock functional, but with a modified
exchange term in which the square of the density matrix \gamma(X, X') is
replaced by the square of \gamma^{1/2}(X, X'). After an extensive introductory
discussion of density-matrix-functional theory we show, among other things,
that this functional is convex (unlike the HF functional) and that energy
minimizing \gamma's have unique densities \rho(x), which is a physically
desirable property often absent in HF theory. We show that minimizers exist if
N \leq Z, and derive various properties of the minimal energy and the
corresponding minimizers. We also give a precise statement about the equation
for the orbitals of \gamma, which is more complex than for HF theory. We state
some open mathematical questions about the theory together with conjectured
solutions.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 16:47:21 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 20:57:42 GMT"
},
{
"version": "v3",
"created": "Tue, 29 Sep 2009 02:20:23 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Frank",
"Rupert L.",
""
],
[
"Lieb",
"Elliott H.",
""
],
[
"Seiringer",
"Robert",
""
],
[
"Siedentop",
"Heinz",
""
]
] |
0705.1588 | L. S. Schulman | L. S. Schulman | Mean Field Spin Glass in the Observable Representation | To appear in Phys. Rev. Lett | Phys. Rev. Lett. 98, 257202 (2007) | 10.1103/PhysRevLett.98.257202 | null | cond-mat.stat-mech cond-mat.dis-nn | null | The state space for the $N$-spin mean field (SK) spin glass--nominally an
$N$-cube--is embedded in a low dimensional continuous space in such a way that
metastable and stable phases can easily be discerned, a concept of nearness of
configurations defined, and peaks in the Parisi $q$-parameter overlap
distribution identified. The dynamical and partly hierarchical interrelation of
these phases can be directly imaged.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 07:13:38 GMT"
}
] | 2007-11-08T00:00:00 | [
[
"Schulman",
"L. S.",
""
]
] |
0705.1589 | Takahiro Nishimichi | Takahiro Nishimichi, Hiroshi Ohmuro, Masashi Nakamichi, Atsushi
Taruya, Kazuhiro Yahata, Akihito Shirata, Shun Saito, Hidenori Nomura,
Kazuhiro Yamamoto and Yasushi Suto | Characteristic Scales of Baryon Acoustic Oscillations from Perturbation
Theory: Non-linearity and Redshift-Space Distortion Effects | 21 pages, 9 figures, references and supplementary sections added,
accepted for publication in PASJ | PASJ 59(2007) 1049 | 10.1093/pasj/59.6.1049 | null | astro-ph | null | An acoustic oscillation of the primeval photon-baryon fluid around the
decoupling time imprints a characteristic scale in the galaxy distribution
today, known as the baryon acoustic oscillation (BAO) scale. Several on-going
and/or future galaxy surveys aim at detecting and precisely determining the BAO
scale so as to trace the expansion history of the universe. We consider
nonlinear and redshift-space distortion effects on the shifts of the BAO scale
in $k$-space using perturbation theory. The resulting shifts are indeed
sensitive to different choices of the definition of the BAO scale, which needs
to be kept in mind in the data analysis. We present a toy model to explain the
physical behavior of the shifts. We find that the BAO scale defined as in
Percival et al. (2007) indeed shows very small shifts ($\lesssim$ 1%) relative
to the prediction in {\it linear theory} in real space. The shifts can be
predicted accurately for scales where the perturbation theory is reliable.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 06:26:49 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Aug 2007 01:18:03 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Nishimichi",
"Takahiro",
""
],
[
"Ohmuro",
"Hiroshi",
""
],
[
"Nakamichi",
"Masashi",
""
],
[
"Taruya",
"Atsushi",
""
],
[
"Yahata",
"Kazuhiro",
""
],
[
"Shirata",
"Akihito",
""
],
[
"Saito",
"Shun",
""
],
[
"Nomura",
"Hidenori",
""
],
[
"Yamamoto",
"Kazuhiro",
""
],
[
"Suto",
"Yasushi",
""
]
] |
0705.1590 | Sacha Davidson | Sacha Davidson | Flavoured Leptogenesis | 15 pages, 2 figures, proceedings for the Venice Neutrino Telescopes
Conference. Some typos corrected and references added | null | null | null | hep-ph | null | Thermal leptogenesis, in the seesaw model, is a popular mechanism for
generating the Baryon Asymmetry of the Universe. It was noticed recently, that
including lepton flavour can modify significantly the results. These
proceedings aim to discuss why and when flavour matters, in the thermal
leptogenesis scenario for hierarchical right-handed neutrinos. No Boltzmann
Equations are introduced.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 06:41:16 GMT"
},
{
"version": "v2",
"created": "Fri, 18 May 2007 08:13:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Davidson",
"Sacha",
""
]
] |
0705.1591 | Jan-e Alam Dr. | Jajati K. Nayak, Jane Alam, Sourav Sarkar and Bikash Sinha | Thermal photon to dilepton ratio in ultra-relativistic heavy ion
collisions | 9 pages with 11 eps figures | Phys.Rev.C78:034903,2008 | 10.1103/PhysRevC.78.034903 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ratio of transverse momentum distribution of thermal photons to dilepton
has been evaluated. It is observed that this ratio reaches a plateau beyond a
certain value of transverse momentum. We argue that this ratio can be used to
estimate the initial temperature of the system by selecting the transverse
momentum and invariance mass windows judiciously. It is demonstrated that if
the radial flow is large then the plateau disappear and hence a deviation from
the plateau can be used as an indicator of large radial flow. The sensitivity
of the results on various input parameters has been studied.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 07:13:01 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Feb 2009 10:44:20 GMT"
}
] | 2009-02-03T00:00:00 | [
[
"Nayak",
"Jajati K.",
""
],
[
"Alam",
"Jane",
""
],
[
"Sarkar",
"Sourav",
""
],
[
"Sinha",
"Bikash",
""
]
] |
0705.1592 | Michael Feast | Floor van Leeuwen, Michael W. Feast, Patricia A. Whitelock and Clifton
D. Laney | Cepheid Parallaxes and the Hubble Constant | 9 pages, 1 figure, on-line material from [email protected].
Accepted for MNRAS | Mon.Not.Roy.Astron.Soc.379:723-737,2007 | 10.1111/j.1365-2966.2007.11972.x | null | astro-ph | null | Revised Hipparcos parallaxes for classical Cepheids are analysed together
with 10 HST-based parallaxes (Benedict et al.). In a reddening-free V,I
relation we find that the coefficient of logP is the same within the
uncertainties in our Galaxy as in the LMC, contrary to some previous
suggestions. Cepheids in the inner region of NGC4258 with near solar
metallicities (Macri et al.) confirm this result. We obtain a zero-point for
the reddening-free relation and apply it to Cepheids in galaxies used by
Sandage et al. to calibrate the absolute magnitudes of SNIa and to derive the
Hubble constant. We revise their result from 62 to 70+/-5 km/s/Mpc. The
Freedman et al. 2001 value is revised from 72 to 76+/-8 km/s/Mpc. These results
are insensitive to Cepheid metallicity corrections. The Cepheids in the inner
region of NGC4258 yield a modulus of 29.22+/-0.03(int) compared with a
maser-based modulus of 29.29+/-0.15. Distance moduli for the LMC, uncorrected
for any metallicity effects, are; 18.52+/-0.03 from a reddening-free relation
in V,I; 18.47+/-0.03 from a period-luminosity relation at K; 18.45+/-0.04 from
a period-luminosity-colour relation in J,K. Adopting a metallicity correction
in V,I from Marci et al. leads to a true LMC modulus of 18.39+/-0.05.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 07:22:55 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"van Leeuwen",
"Floor",
""
],
[
"Feast",
"Michael W.",
""
],
[
"Whitelock",
"Patricia A.",
""
],
[
"Laney",
"Clifton D.",
""
]
] |
0705.1593 | M. Naeem Khan Mr | M. Naeem, S. K. Hasanain, A. Mumtaz | Electrical transport and optical studies of ferromagnetic Cobalt doped
ZnO nanoparticles exhibiting a metal-insulator transition | 7 pages, 6 figures | J. Phys.: Condens. Matter 20 (2008) 025210 | 10.1088/0953-8984/20/02/025210 | null | cond-mat.mtrl-sci cond-mat.soft | null | The observed correlation of oxygen vacancies and room temperature
ferromagnetic ordering in Co doped ZnO1-o nanoparticles reported earlier (Naeem
et al Nanotechnology 17, 2675-2680) has been further explored by transport and
optical measurements. In these particles room temperature ferromagnetic
ordering had been observed to occur only after annealing in forming gas. In the
current work the optical properties have been studied by diffuse reflection
spectroscopy in the UV-Vis region and the band gap of the Co doped compositions
has been found to decrease with Co addition. Reflections minima are observed at
the energies characteristic of Co+2 d-d (tethrahedral symmetry) crystal field
transitions, further establishing the presence of Co in substitutional sites.
Electrical transport measurements on palletized samples of the nanoparticles
show that the effect of a forming gas is to strongly decrease the resistivity
with increasing Co concentration. For the air annealed and non-ferromagnetic
samples the variation in the resistivity as a function of Co content are
opposite to those observed in the particles prepared in forming gas. The
ferromagnetic samples exhibit an apparent change from insulator to metal with
increasing temperatures for T>380K and this change becomes more pronounced with
increasing Co content. The magnetic and resistive behaviors are correlated by
considering the model by Calderon et al [M. J. Calderon and S. D. Sarma, Annals
of Physics 2007 (Accepted doi: 10.1016/j.aop.2007.01.010] where the
ferromagnetism changes from being mediated by polarons in the low temperature
insulating region to being mediated by the carriers released from the weakly
bound states in the higher temperature metallic region.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 07:46:54 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 05:39:10 GMT"
},
{
"version": "v3",
"created": "Sat, 8 Dec 2007 11:52:38 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Naeem",
"M.",
""
],
[
"Hasanain",
"S. K.",
""
],
[
"Mumtaz",
"A.",
""
]
] |
0705.1594 | Giorgio Cortiana | CDF-Collaboration | Measurement of the top-quark mass using missing $E_T$+jets events with
secondary vertex $b$-tagging at CDF II | 8 pages, 4 figures | Phys.Rev.D75:111103,2007 | 10.1103/PhysRevD.75.111103 | null | hep-ex | null | We present a measurement of the top-quark mass in $p\bar p$ collisions at
\hbox{$\sqrt{s}=1.96$} TeV which uses events with an inclusive signature of
missing transverse energy and jets. % The event selection is sensitive to
$t\bar t\to W^+bW^-\bar b\to l\nu b q q^\prime \bar b$ independent of the
lepton flavor, and results in a large acceptance for $W\to\tau\nu$ decays. %
All-hadronic $t\bar t$ decays and events with identified electrons or muons are
vetoed to provide a statistically independent sample with respect to all
previous measurements. % The top-quark mass is inferred from the distribution
of the scalar sum of all jet transverse energies and the missing transverse
energy. Using 311 pb$^{-1}$ of integrated luminosity recorded by the Collider
Detector at Fermilab, we measure a top-quark mass $m_t = 172.3
^{+10.8}_{-9.6}$(stat.)$\pm 10.8$(syst.) GeV/$c^2$. While the uncertainty on
$m_t$ is larger than that of other measurements, the result is statistically
uncorrelated with those of other methods, and thus can help to reduce the
overall $m_t$ uncertainty when combined with other existing measurements.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 07:53:48 GMT"
}
] | 2010-05-12T00:00:00 | [
[
"CDF-Collaboration",
"",
""
]
] |
0705.1595 | Nobuhiro Nakamura | Nobuhiro Nakamura | Bauer-Furuta invariants under Z_2-actions | 21 pages, typos corrected, several descriptions changed | Math. Z. 262, (2009), 219-233 | null | null | math.GT | null | S.Bauer and M.Furuta defined a stable cohomotopy refinement of the
Seiberg-Witten invariants. In this paper, we prove a vanishing theorem of
Bauer-Furuta invariants for 4-manifolds with smooth Z/2-actions. As an
application, we give a constraint on smooth Z/2-actions on homotopy K3#K3, and
construct a nonsmoothable locally linear Z/2-action on K3#K3. We also construct
a nonsmoothable locally linear Z/2-action on $K3$.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 07:55:28 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Apr 2008 07:29:29 GMT"
}
] | 2013-11-08T00:00:00 | [
[
"Nakamura",
"Nobuhiro",
""
]
] |
0705.1596 | Konrad Tywoniuk | I. Arsene (University of Oslo), L. Bravina (University of Oslo and
SINP, Moscow), A. Kaidalov (ITEP, Moscow), K. Tywoniuk (University of Oslo)
and E. Zabrodin (University of Oslo and SINP, Moscow) | Gluon shadowing in the Glauber-Gribov model at HERA | 18 pages, 6 figures; references added, discussion of model enlarged,
calculation of low-x contribution corrected; to appear in Phys. Lett | Phys.Lett.B657:170-175,2007 | 10.1016/j.physletb.2007.09.065 | null | hep-ph | null | We calculate shadowing using new data on the gluon density of the Pomeron
recently measured with high precision at HERA. The calculations are made in a
Glauber-Gribov framework and Pomeron tree-diagrams are summed up within a
unitarity-conserving procedure. The total cross section of $\vphot A$
interaction is then found in a parameter-free description, employing gluon
diffractive and inclusive distribution functions as input. A strong shadowing
effect is obtained, in good agreement with several other models. Impact
parameter dependence of gluon shadowing is also presented.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 08:16:48 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Sep 2007 15:26:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Arsene",
"I.",
"",
"University of Oslo"
],
[
"Bravina",
"L.",
"",
"University of Oslo and\n SINP, Moscow"
],
[
"Kaidalov",
"A.",
"",
"ITEP, Moscow"
],
[
"Tywoniuk",
"K.",
"",
"University of Oslo"
],
[
"Zabrodin",
"E.",
"",
"University of Oslo and SINP, Moscow"
]
] |
0705.1597 | Kai Meng Tan | Sibylle Schroll and Kai Meng Tan | Weight 2 blocks of general linear groups and modular Alvis-Curtis
duality | 27 pages; to appear in Int. Math. Res. Not | null | null | null | math.RT math.QA | null | We obtain the structure of weight 2 blocks and [2:1]-pairs of q-Schur
algebras, and compute explicitly the modular Alvis-Curtis duality for weight 2
blocks of finite general linear groups in non-defining characteristic.
| [
{
"version": "v1",
"created": "Fri, 11 May 2007 08:09:09 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Oct 2007 01:55:11 GMT"
}
] | 2007-10-24T00:00:00 | [
[
"Schroll",
"Sibylle",
""
],
[
"Tan",
"Kai Meng",
""
]
] |
Subsets and Splits
No saved queries yet
Save your SQL queries to embed, download, and access them later. Queries will appear here once saved.