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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.3330 | Klaus Werner | Klaus Werner (SUBATECH, University of Nantes, Nantes, France) and
Tanguy Pierog (Forschungszentrum Karlsruhe, Institut fuer Kernphysik,
Karlsruhe, Germany) | Extended Air Shower Simulations Based on EPOS | Talk presented at EDS07 | AIPConf.Proc.928:111-117,2007 | 10.1063/1.2775903 | null | astro-ph hep-ph | null | We discuss air shower simulations based on the EPOS hadronic interaction
model.
A remarkable feature is the fact that the number of produced muons is
considerably larger compared to other interaction models. We show that this is
due to an improved treatment of baryon-antibaryon production.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 08:03:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Werner",
"Klaus",
"",
"SUBATECH, University of Nantes, Nantes, France"
],
[
"Pierog",
"Tanguy",
"",
"Forschungszentrum Karlsruhe, Institut fuer Kernphysik,\n Karlsruhe, Germany"
]
] |
0707.3331 | Vladimir Khatsymovsky | V. M. Khatsymovsky | On positivity of quantum measure and of effective action in area tensor
Regge calculus | 18 pages, 4 figures | null | null | null | hep-th gr-qc | null | Because of unboundedness of the general relativity action, Euclidean version
of the path integral in general relativity requires definition. Area tensor
Regge calculus is considered in the representation with independent area tensor
and finite rotation matrices. Being integrated over rotation matrices the path
integral measure in area tensor Regge calculus is rewritten by moving
integration contours to complex plain so that it looks as that one with
effective action in the exponential with positive real part. We speculate that
positivity of the measure can be expected in the most part of range of
variation of area tensors.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 08:29:38 GMT"
}
] | 2007-07-25T00:00:00 | [
[
"Khatsymovsky",
"V. M.",
""
]
] |
0707.3332 | Yongseok Oh | Yongseok Oh, Che Ming Ko | Elliptic flow of deuterons in relativistic heavy-ion collisions | 18 pages, REVTeX, 8 figures, structure of the article was changed, to
be published in Phys. Rev. C | Phys.Rev.C76:054910,2007 | 10.1103/PhysRevC.76.054910 | null | nucl-th hep-ph | null | Using a dynamical model based on the $NN \to d\pi$, $NNN \to dN$, and $NN\pi
\to d\pi$ reactions and measured proton and pion transverse momentum spectra
and elliptic flows, we study the production of deuterons and their elliptic
flow in heavy ion collisions at RHIC. The results are compared with those from
the coalescence model. The deviation of deuteron elliptic flow from the
constituent nucleon number scaling expected from the coalescence model and the
comparison with the experimental data are discussed in connection to the
allowed nucleon phase space in these reactions.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 08:13:01 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Oct 2007 22:36:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Oh",
"Yongseok",
""
],
[
"Ko",
"Che Ming",
""
]
] |
0707.3333 | J. Fernando Barbero G. | J. Fernando Barbero G., Daniel G\'omez Vergel, Eduardo J. S.
Villase\~nor | Hamiltonian Dynamics of Linearly Polarized Gowdy Models Coupled to
Massless Scalar Fields | Final version to appear in Classical and Quantum Gravity | Class.Quant.Grav.24:5945-5972,2007 | 10.1088/0264-9381/24/23/016 | null | gr-qc | null | The purpose of this paper is to analyze in detail the Hamiltonian formulation
for the compact Gowdy models coupled to massless scalar fields as a necessary
first step towards their quantization. We will pay special attention to the
coupling of matter and those features that arise for the three-handle and
three-sphere topologies that are not present in the well studied three torus
case -in particular the polar constraints that come from the regularity
conditions on the metric. As a byproduct of our analysis we will get an
alternative understanding, within the Hamiltonian framework, of the appearance
of initial and final singularities for these models.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:27:58 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Oct 2007 08:24:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Vergel",
"Daniel Gómez",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] |
0707.3334 | Eugene Vasiliev | Eugene Vasiliev | Dark matter annihilation near a black hole: plateau vs. weak cusp | 4 pages, 3 figures. Matches published version | Phys.Rev.D76:103532,2007 | 10.1103/PhysRevD.76.103532 | null | astro-ph | null | Dark matter annihilation in so-called ``spikes'' near black holes is believed
to be an important method of indirect dark matter detection. In the case of
circular particle orbits, the density profile of dark matter has a plateau at
small radii, the maximal density being limited by the annihilation
cross-section. However, in the general case of arbitrary velocity anisotropy
the situation is different. Particulary, for isotropic velocity distribution
the density profile cannot be shallower than r^{-1/2} in the very centre.
Indeed, a detailed study reveals that in many cases the term ``annihilation
plateau'' is misleading, as the density actually continues to rise towards
small radii and forms a weak cusp, rho ~ r^{-(beta+1/2)}, where beta is the
anisotropy coefficient. The annihilation flux, however, does not change much in
the latter case, if averaged over an area larger than the annihilation radius.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 13:43:41 GMT"
},
{
"version": "v2",
"created": "Sat, 1 Dec 2007 14:22:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vasiliev",
"Eugene",
""
]
] |
0707.3335 | Roberto Maiolino | R. Maiolino, R. Neri, A. Beelen, F. Bertoldi, C.L. Carilli, P.
Caselli, P. Cox, K.M. Menten, T. Nagao, A. Omont, C.M. Walmsley, F. Walter,
A. Weiss | Molecular gas in QSO host galaxies at z>5 | Accepted for publication in A&A Letters, 6 pages, 3 figures | null | 10.1051/0004-6361:20078136 | null | astro-ph | null | We present observations with the IRAM Plateau de Bure Interferometer of three
QSOs at z>5 aimed at detecting molecular gas in their host galaxies as traced
by CO transitions. CO (5-4) is detected in SDSSJ033829.31+002156.3 at z=5.0267,
placing it amongst the most distant sources detected in CO. The CO emission is
unresolved with a beam size of ~1", implying that the molecular gas is
contained within a compact region, less than ~3kpc in radius. We infer an upper
limit on the dynamical mass of the CO emitting region of ~3x10^10
Msun/sin(i)^2. The comparison with the Black Hole mass inferred from near-IR
data suggests that the BH-to-bulge mass ratio in this galaxy is significantly
higher than in local galaxies. From the CO luminosity we infer a mass reservoir
of molecular gas as high as M(H2)=2.4x10^10 Msun, implying that the molecular
gas accounts for a significant fraction of the dynamical mass. When compared to
the star formation rate derived from the far-IR luminosity, we infer a very
short gas exhaustion timescale (~10^7 yrs), comparable to the dynamical
timescale. CO is not detected in the other two QSOs (SDSSJ083643.85+005453.3
and SDSSJ163033.90+401209.6) and upper limits are given for their molecular gas
content. When combined with CO observations of other type 1 AGNs, spanning a
wide redshift range (0<z<6.4), we find that the host galaxy CO luminosity
(hence molecular gas content) and the AGN optical luminosity (hence BH
accretion rate) are correlated, but the relation is not linear: L(CO) ~
[lambda*L_lambda(4400A)]^0.72. Moreover, at high redshifts (and especially at
z>5) the CO luminosity appears to saturate. We discuss the implications of
these findings in terms of black hole-galaxy co-evolution.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 08:53:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maiolino",
"R.",
""
],
[
"Neri",
"R.",
""
],
[
"Beelen",
"A.",
""
],
[
"Bertoldi",
"F.",
""
],
[
"Carilli",
"C. L.",
""
],
[
"Caselli",
"P.",
""
],
[
"Cox",
"P.",
""
],
[
"Menten",
"K. M.",
""
],
[
"Nagao",
"T.",
""
],
[
"Omont",
"A.",
""
],
[
"Walmsley",
"C. M.",
""
],
[
"Walter",
"F.",
""
],
[
"Weiss",
"A.",
""
]
] |
0707.3336 | Koujin Takeda | Koujin Takeda, Atsushi Hatabu, Yoshiyuki Kabashima | Statistical mechanical analysis of the linear vector channel in digital
communication | 15 pages, 2 figures | J. Phys. A40 (2007) 14085-14098 | 10.1088/1751-8113/40/47/004 | null | cs.IT cond-mat.dis-nn cond-mat.stat-mech math.IT | null | A statistical mechanical framework to analyze linear vector channel models in
digital wireless communication is proposed for a large system. The framework is
a generalization of that proposed for code-division multiple-access systems in
Europhys. Lett. 76 (2006) 1193 and enables the analysis of the system in which
the elements of the channel transfer matrix are statistically correlated with
each other. The significance of the proposed scheme is demonstrated by
assessing the performance of an existing model of multi-input multi-output
communication systems.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 08:35:39 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Nov 2007 13:52:44 GMT"
}
] | 2007-11-06T00:00:00 | [
[
"Takeda",
"Koujin",
""
],
[
"Hatabu",
"Atsushi",
""
],
[
"Kabashima",
"Yoshiyuki",
""
]
] |
0707.3337 | Pengzi Miao | Hubert Bray and Pengzi Miao | On The Capacity of Surfaces in Manifolds with Nonnegative Scalar
Curvature | 18 pages | Invent. math. 172, 459-475 (2008) | 10.1007/s00222-007-0102-x | null | math.DG gr-qc | null | Given a surface in an asymptotically flat 3-manifold with nonnegative scalar
curvature, we derive an upper bound for the capacity of the surface in terms of
the area of the surface and the Willmore functional of the surface. The
capacity of a surface is defined to be the energy of the harmonic function
which equals 0 on the surface and goes to 1 at infinity. Even in the special
case of Euclidean space, this is a new estimate. More generally, equality holds
precisely for a spherically symmetric sphere in a spatial Schwarzschild
3-manifold. As applications, we obtain inequalities relating the capacity of
the surface to the Hawking mass of the surface and the total mass of the
asymptotically flat manifold.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 08:37:02 GMT"
}
] | 2008-07-17T00:00:00 | [
[
"Bray",
"Hubert",
""
],
[
"Miao",
"Pengzi",
""
]
] |
0707.3338 | Alessandro Silva | Davide Fioretto, Alessandro Silva | Phase coherence, inelastic scattering, and interaction corrections in
pumping through quantum dots | 4.1 pages, 1 figure, revised version | Phys. Rev. Lett. 100, 236803 (2008) | 10.1103/PhysRevLett.100.236803 | null | cond-mat.mes-hall | null | Adiabatic quantum pumping in noninteracting, phase coherent quantum dots is
elegantly described by Brouwer's formula. Interactions within the dot, while
suppressing phase coherence, make Brouwer's formalism inapplicable. In this
paper, we discuss the nature of the physical processes forcing a description of
pumping beyond Brouwer's formula, and develop, using a controlled adiabatic
expansion, a useful formalism to study the effect of interactions within a
generic perturbative scheme. The pumped current consists of a first
contribution, analogous to Brouwer's formula and accounting for the remanent
coherence, and of interaction corrections describing inelastic scattering. We
apply the formalism to study the effect of interaction with a bosonic bath on a
resonant level pump and discuss the robustness of the quantization of the
pumped charge in turnstile cycles.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 08:46:39 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Mar 2008 14:37:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fioretto",
"Davide",
""
],
[
"Silva",
"Alessandro",
""
]
] |
0707.3339 | James Langley | J K Langley | Non-real zeros of linear differential polynomials | null | null | null | null | math.CV | null | Lower bounds are given for the number of non-real zeros of a second order
linear differential polynomial with constant coefficients in a real entire
function with finitely many non-real zeros.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 08:47:43 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Langley",
"J K",
""
]
] |
0707.3340 | Fabio Lucio Toninelli | Giambattista Giacomin, Fabio Lucio Toninelli | On the irrelevant disorder regime of pinning models | Published in at http://dx.doi.org/10.1214/09-AOP454 the Annals of
Probability (http://www.imstat.org/aop/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Annals of Probability 2009, Vol. 37, No. 5, 1841-1875 | 10.1214/09-AOP454 | IMS-AOP-AOP454 | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent results have lead to substantial progress in understanding the role of
disorder in the (de)localization transition of polymer pinning models. Notably,
there is an understanding of the crucial issue of disorder relevance and
irrelevance that is now rigorous. In this work, we exploit interpolation and
replica coupling methods to obtain sharper results on the irrelevant disorder
regime of pinning models. In particular, in this regime, we compute the first
order term in the expansion of the free energy close to criticality and this
term coincides with the first order of the formal expansion obtained by field
theory methods. We also show that the quenched and quenched averaged
correlation length exponents coincide, while, in general, they are expected to
be different. Interpolation and replica coupling methods in this class of
models naturally lead to studying the behavior of the intersection of certain
renewal sequences and one of the main tools in this work is precisely renewal
theory and the study of these intersection renewals.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 09:06:15 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Sep 2009 11:55:39 GMT"
}
] | 2009-09-24T00:00:00 | [
[
"Giacomin",
"Giambattista",
""
],
[
"Toninelli",
"Fabio Lucio",
""
]
] |
0707.3341 | Lukasz Andrzej Glinka | Lukasz-Andrzej Glinka | Quantum Information from Graviton-Matter Gas | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 3:087,2007 | 10.3842/SIGMA.2007.087 | null | gr-qc cond-mat.stat-mech hep-th math-ph math.MP quant-ph | null | We present basics of conceptually new-type way for explaining of the origin,
evolution and current physical properties of our Universe from the
graviton-matter gas viewpoint. Quantization method for the Friedmann-Lemaitre
Universe based on the canonical Hamilton equations of motion is proposed and
quantum information theory way to physics of the Universe is showed. The
current contribution from the graviton-matter gas temperature in quintessence
approximation is discussed.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 09:06:48 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jul 2007 17:18:16 GMT"
},
{
"version": "v3",
"created": "Sat, 28 Jul 2007 13:25:12 GMT"
},
{
"version": "v4",
"created": "Mon, 20 Aug 2007 15:11:57 GMT"
},
{
"version": "v5",
"created": "Tue, 4 Sep 2007 16:54:16 GMT"
}
] | 2008-12-19T00:00:00 | [
[
"Glinka",
"Lukasz-Andrzej",
""
]
] |
0707.3342 | S. Weinzierl | Stefan Weinzierl | Automated calculations for multi-leg processes | 43 pages, plenary talk given at the ACAT 07 conference, Amsterdam,
2007; v2: references added | PoS ACAT:005,2007 | null | null | hep-ph | null | The search for signals of new physics at the forthcoming LHC experiments
involves the analysis of final states characterised by a high number of
hadronic jets or identified particles. Precise theoretical predictions for
these processes require the computation of scattering amplitudes with a large
number of external particles and beyond leading order in perturbation theory.
The complexity of a calculation grows with the number of internal loops as well
as with the number of external legs. Automatisation of at least next-to-leading
order calculations for LHC processes is therefore a timely task. I will discuss
various approaches.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 09:26:46 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 12:07:13 GMT"
}
] | 2009-04-16T00:00:00 | [
[
"Weinzierl",
"Stefan",
""
]
] |
0707.3343 | Lisheng Geng | L. S. Geng and E. Oset | The role of the $\Lambda(1405)$ in the $pp\to p K^+\Lambda(1405)$
reaction | version to appear in European Physical Journal A; theoretical
uncertainties reanalyzed, data updated according to the experiment | Eur.Phys.J.A34:405-412,2007 | 10.1140/epja/i2008-10518-5 | null | hep-ph | null | We report a theoretical study of the $pp\to p K^+\Lambda(1405)$ reaction,
which was recently investigated at COSY-J\"{u}lich by using a 3.65 GeV/c
circulating proton beam incident on an internal hydrogen target. The reaction
is driven by single kaon exchange, single pion exchange, and single rho
exchange terms which have very different shapes due to the two pole structure
of the $\Lambda(1405)$ and the presence of background terms. The shape for the
sum of the three contributions, as well as the total cross section, are
consistent with present data within experimental and theoretical uncertainties,
using reasonable form factors for the meson-baryon vertices.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 09:27:35 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 18:23:44 GMT"
},
{
"version": "v3",
"created": "Tue, 22 Jan 2008 18:33:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Geng",
"L. S.",
""
],
[
"Oset",
"E.",
""
]
] |
0707.3344 | Markos Maniatis | M. Maniatis, A. von Manteuffel, O. Nachtmann | CP Violation in the General Two-Higgs-Doublet Model: a Geometric View | 19 pages, minor additions, minor typos corrected, results unchanged | Eur.Phys.J.C57:719-738,2008 | 10.1140/epjc/s10052-008-0712-5 | HD-THEP-07-16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the CP properties of the potential in the general
Two-Higgs-Doublet Model (THDM). This is done in a concise way using real gauge
invariant functions built from the scalar products of the doublet fields. The
space of these invariant functions, parametrising the gauge orbits of the Higgs
fields, is isomorphic to the forward light cone and its interior. CP
transformations are shown to correspond to reflections in the space of the
gauge invariant functions. We consider CP transformations where no mixing of
the Higgs doublets is taken into account as well as the general case where the
Higgs basis is not fixed. We present basis independent conditions for explicit
CP violation which may be checked easily for any THDM potential. Conditions for
spontaneous CP violation, that is CP violation through the vacuum expectation
values of the Higgs fields, are also derived in a basis independent way.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:32:27 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Sep 2008 14:48:53 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Maniatis",
"M.",
""
],
[
"von Manteuffel",
"A.",
""
],
[
"Nachtmann",
"O.",
""
]
] |
0707.3345 | Wolfgang Ziller | Wolfgang Ziller | On the geometry of cohomogeneity one manifolds with positive curvature | 25 pages | null | null | null | math.DG | null | This is a survey on cohomogeneity one manifolds with positive curvature. We
discuss the known examples of this type and their geometry and the functions
that describe the metric. We also describe the classification of cohomogeneity
one manifolds that can admit a metric with positive curvature due to
Grove-Wilking-Ziller. Two series of candidates arose in this classification for
which it is not yet know if they admit positive curvature. The connection of
these candidates to the Hitchin self dual Einstein orbifolds is discussed as
well, including the curvature properties of the Hitchin metrics.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 09:42:40 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Ziller",
"Wolfgang",
""
]
] |
0707.3346 | Asish Kundu K | Asish K. Kundu, E. -L. Rautama, Ph. Boullay, V. Caignaert, V. Pralong,
and B. Raveau | Spin-locking effect in the nanoscale ordered perovskite cobaltite
LaBaCo2O6 | 16 pages including figures | Phys. Rev. B 76, 184432 (2007) | 10.1103/PhysRevB.76.184432 | null | cond-mat.mtrl-sci cond-mat.other | null | A new nanoscale ordered perovskite cobaltite, which consists of 90 degree
ordered domains of the layered-112 LaBaCo2O6 has been evidenced by high
resolution- transmission electron microscopy. This new form, like the
disordered La0.5Ba0.5CoO3 and ordered LaBaCo2O6, exhibits a ferromagnetic
transition at TC around 179 K. However, it differs from the two previous forms
by its strong magnetic anisotropy, and correlatively by its high value of
coercivity (0.42 Tesla) at low temperature. We suggest that this behaviour
originates from the locking of magnetic spins in the 90 degree oriented
nano-domain. Moreover, one observes a semi-metal/semi-metal transition at TC
with a maximum magnetoresistance of 6.5 % at this temperature.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 09:50:06 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Kundu",
"Asish K.",
""
],
[
"Rautama",
"E. -L.",
""
],
[
"Boullay",
"Ph.",
""
],
[
"Caignaert",
"V.",
""
],
[
"Pralong",
"V.",
""
],
[
"Raveau",
"B.",
""
]
] |
0707.3347 | Hans-G. Ludwig | Hans-G. Ludwig | 3D spectral synthesis and rotational line broadening | 3 pages, 4 figures, accepted for publication by A&A | null | 10.1051/0004-6361:20066909 | null | astro-ph | null | Spectral synthesis calculations based on three-dimensional stellar atmosphere
models are limited by the affordable angular resolution of the radiation field.
This hampers an accurate treatment of rotational line broadening. We aim to
find a treatment of rotational broadening of a spherical star when the
radiation field is only available at a modest number of limb-angles. We apply a
combination of analytical considerations of the line-broadening process and
numerical tests. We obtain a method which is closely related to classical flux
convolution and which performs noticeably better than a previously suggested
procedure. It can be applied to rigid as well as differential rotation.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:10:28 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Ludwig",
"Hans-G.",
""
]
] |
0707.3348 | Balazs Dora | Bal\'azs D\'ora, Mikl\'os Gul\'acsi, Ferenc Simon, Hans Kuzmany | Spin gap and Luttinger liquid description of the NMR relaxation in
carbon nanotubes | 5 pages, 1 figure, 1 table | Phys. Rev. Lett. 99, 166402 (2007) | 10.1103/PhysRevLett.99.166402 | null | cond-mat.str-el cond-mat.mes-hall | null | Recent NMR experiments by Singer et al. [Singer et al. Phys. Rev. Lett. 95,
236403 (2005).] showed a deviation from Fermi-liquid behavior in carbon
nanotubes with an energy gap evident at low temperatures. Here, a comprehensive
theory for the magnetic field and temperature dependent NMR 13C spin-lattice
relaxation is given in the framework of the Tomonaga-Luttinger liquid. The low
temperature properties are governed by a gapped relaxation due to a spin gap (~
30K), which crosses over smoothly to the Luttinger liquid behaviour with
increasing temperature.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:11:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dóra",
"Balázs",
""
],
[
"Gulácsi",
"Miklós",
""
],
[
"Simon",
"Ferenc",
""
],
[
"Kuzmany",
"Hans",
""
]
] |
0707.3349 | Massimo Marezio | T.H. Geballe and M. Marezio | A comment on the superconductivity of Sr2CuO3+delta | 7 pages | null | null | null | cond-mat.supr-con | null | We have revisited data in the literature and find compelling reasons for
believing that enhanced superconductivity occurs in Sr2CuO3+delta when about
one third of the oxygen sites in the CuO2 layers are vacant, contrary to the
almost universally accepted assumption that superconducting interactions in the
high Tc cuprates occur in stoichiometric CuO2 layers.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:17:27 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 10:51:06 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Geballe",
"T. H.",
""
],
[
"Marezio",
"M.",
""
]
] |
0707.3350 | Anupam Mazumdar | A. Mazumdar | New developments on embedding inflation in gauge theory and particle
physics | 74 pages, Review based on Talks | null | null | null | hep-ph astro-ph gr-qc hep-th | null | In this brief review we will discuss how a well motivated particle theory
beyond the eletroweak Standard Model provides ingredients and conditions for a
successful inflation. We will mainly focus on a low energy supersymmetric
Standard Model which provides plenty of scalars. In particular, these scalars
span a multidimensional moduli space of {\it gauge invariant} operators which
carry the Standard Model charges. The inflationary predictions which matches
the current observations are robust due to the fact that inflation occurs
within our own gauge sector where the couplings are well known. We further
argue that based on our current understandings if there exists a {\it string
landscape} of multiple vacua, then it is very natural that the last phase of
inflation would be driven by one of the many supersymmetric Standard Model
modulii. Only such a graceful exit from inflation would provide hot thermal
Standard Model baryons, cold dark matter, conditions for baryogenesis and
foremost the seed density perturbations for the cosmic microwave background
radiation in just {\it one package}. Furthermore we will also discuss how some
of the ingredients of inflation can be tested already by the LHC.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:23:28 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Mazumdar",
"A.",
""
]
] |
0707.3351 | Jeremy Dunning-Davies | M. Moore and J. Dunning-Davies | Reflections and Thoughts on Tired Light | 6 pages | null | null | null | physics.gen-ph | null | The position of the various tired light theories is reviewed briefly and it
is noted that one of the biggest objections to them concerns the mechanism by
which light might lose energy as it travels through space. Here some new work
relating to the constancy of the speed of light is highlighted as providing a
possible solution to this conundrum, thus making more feasible explanation of
phenomena via theories involving the notion of tired light.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:26:55 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Moore",
"M.",
""
],
[
"Dunning-Davies",
"J.",
""
]
] |
0707.3352 | Shaun Mosley | Shaun N. Mosley | Wavepacket Solutions of the Klein-Gordon Equation | plianTeX, 9 pages, velocity operator canonical transformation
included | null | null | null | quant-ph hep-th math-ph math.MP | null | We find dispersion-free wavepacket solutions to the Klein-Gordon equation,
with the only free parameter being the wavepacket velocity $ {\bf v} $. These
wavefunctions are eigenvectors of a velocity operator with commuting components
which is symmetric in a certain scalar product space. We show that this
velocity operator corresponds to a classical generator which may be obtained by
a canonical tranformation from $ {\bf x}, {\bf k} $.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:27:05 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 16:37:48 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Sep 2007 09:38:57 GMT"
},
{
"version": "v4",
"created": "Wed, 14 Nov 2007 12:28:42 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Mosley",
"Shaun N.",
""
]
] |
0707.3353 | Xingang Wang Dr | Xingang Wang, Ying-Cheng Lai, Cangtao Zhou, and Choy Heng Lai | The multiple effects of gradient coupling on network synchronization | 4 pages, 4 figures | null | 10.1103/PhysRevE.77.056208 | null | nlin.AO nlin.PS | null | Recent studies have shown that synchronizability of complex networks can be
significantly improved by asymmetric couplings, and increase of coupling
gradient is always in favor of network synchronization. Here we argue and
demonstrate that, for typical complex networks, there usually exists an optimal
coupling gradient under which the maximum network synchronizability is
achieved. After this optimal value, increase of coupling gradient could
deteriorate synchronization. We attribute the suppression of network
synchronization at large gradient to the phenomenon of network breaking, and
find that, in comparing with sparsely connected homogeneous networks, densely
connected heterogeneous networks have the superiority of adopting large
gradient. The findings are supported by indirect simulations of eigenvalue
analysis and direct simulations of coupled nonidentical oscillator networks.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:33:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Xingang",
""
],
[
"Lai",
"Ying-Cheng",
""
],
[
"Zhou",
"Cangtao",
""
],
[
"Lai",
"Choy Heng",
""
]
] |
0707.3354 | A. D. Polosa | L. Maiani, A.D. Polosa, V. Riquer | Indications of a Four-Quark Structure for the X(3872) and X(3876)
Particles from Recent Belle and BABAR Data | 5 pages, some revision of the text, results unchanged. To appear in
Phys. Rev. Lett | Phys.Rev.Lett.99:182003,2007 | 10.1103/PhysRevLett.99.182003 | null | hep-ph | null | Recent results by BELLE and BaBar point to the existence of a second X
particle decaying in D^0 D^0bar pi^0, a few MeV above the X(3872). We identify
the two X states with the neutral particles predicted by the 4-quark model and
show that production and decays are consistent with this assignement. We
consider the yet-to-be-observed charged partners and give new hints on how to
look for them.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:34:02 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Sep 2007 07:42:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Maiani",
"L.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
]
] |
0707.3355 | Kei-Jiro Takahashi | Kei-Jiro Takahashi | Three-Family Models from a Heterotic Orbifold on the E_6 Root Lattice | 20 pages, 1 figures; v3: Classification for orbifolds on the E_6
lattice is added, typos corrected, published version | Prog.Theor.Phys.119:491-507,2008 | 10.1143/PTP.119.491 | KUNS-2086 | hep-th hep-ph | null | We classify N=1 orbifolds on the E_6 root lattice and investigate explicit
model constructions on the Z_3xZ_3 orbifold in heterotic string theory.
Interestingly some of the twisted sectors from the Z_3xZ_3 orbifold on the E_6
root lattice have just three fixed tori respectively, and generate three
degenerate massless states. We also found three point functions with flavor
mixing terms. We assume only non-standard gauge embeddings and find that they
lead to three-family SU(5) and SO(10) GUT-like models. These models also
include strongly coupled sectors in the low energy and messenger states charged
with both hidden and visible sectors.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:03:42 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 16:20:20 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Mar 2008 12:19:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Takahashi",
"Kei-Jiro",
""
]
] |
0707.3356 | Andrea Merloni | Andrea Merloni (MPE), Sebastian Heinz (UW-Madison) | Measuring the kinetic power of AGN in the radio mode | 13 pages, 6 figures. Accepted for publication in MNRAS | MNRAS, 381, 589 (2007) | 10.1111/j.1365-2966.2007.12253.x | null | astro-ph | null | (Abridged) We have studied the relationship among nuclear radio and X-ray
power, Bondi rate and the kinetic luminosity of sub-Eddington active galactic
nuclear (AGN) jets. Besides the recently discovered correlation between jet
kinetic and Bondi power, we show that a clear correlation exists also between
Eddington-scaled kinetic power and bolometric luminosity, given by:
Log(L_kin/L_Edd)=0.49*Log(L_bol/L_Edd)-0.78. The measured slope suggests that
these objects are in a radiatively inefficient accretion mode, and has been
used to put stringent constraints on the properties of the accretion flow. We
found no statistically significant correlations between Bondi power and
bolometric AGN luminosity, apart from that induced by their common dependence
on L_kin. Analyzing the relation between kinetic power and radio core
luminosity, we are then able to determine, statistically, both the probability
distribution of the mean jets Lorentz factor, peaking at \Gamma~7, and the
intrinsic relation between kinetic and radio core luminosity, that we estimate
as: Log(L_kin)=0.81*Log(L_R)+11.9, in good agreement with theoretical
predictions of synchrotron jet models. With the aid of these findings,
quantitative assessments of kinetic feedback from supermassive black holes in
the radio mode will be possible based on accurate determinations of the central
engine properties alone. As an example, Sgr A* may follow the correlations of
radio mode AGN, based on its observed radiative output and on estimates of the
accretion rate both at the Bondi radius and in the inner flow. If this is the
case, the SMBH in the Galactic center is the source of ~ 5 times 10^38 ergs/s
of mechanical power, equivalent to about 1.5 supernovae every 10^5 years.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:38:30 GMT"
}
] | 2008-07-02T00:00:00 | [
[
"Merloni",
"Andrea",
"",
"MPE"
],
[
"Heinz",
"Sebastian",
"",
"UW-Madison"
]
] |
0707.3357 | Giovanni Morchio | G.Morchio, F.Strocchi | Quantum mechanics on manifolds and topological effects | A few comments have been added to the Introduction, together with
related references; a few words have been changed in the Abstract and a Note
added to the Title | Lett.Math.Phys.82:219-236,2007 | 10.1007/s11005-007-0188-5 | IFUP TH 07/19 | math-ph hep-th math.MP | null | A unique classification of the topological effects associated to quantum
mechanics on manifolds is obtained on the basis of the invariance under
diffeomorphisms and the realization of the Lie-Rinehart relations between the
generators of the diffeomorphism group and the algebra of infinitely
differentiable functions on the manifold. This leads to a unique
("Lie-Rinehart") C* algebra as observable algebra; its regular representations
are shown to be locally Schroedinger and in one to one correspondence with the
unitary representations of the fundamental group of the manifold. Therefore, in
the absence of spin degrees of freedom and external fields, the first homotopy
group of the manifold appears as the only source of topological effects.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:45:37 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Sep 2007 08:59:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Morchio",
"G.",
""
],
[
"Strocchi",
"F.",
""
]
] |
0707.3358 | Sheung Tsun Tsou | Jose Bordes (Valencia), H. M. Chan (Rutherford Laboratory), S. T. Tsou
(Oxford) | New Angle on the Strong CP and Chiral Symmetry Problems from a Rotating
Mass Matrix | 14 pages | Int.J.Mod.Phys.A24:101-112,2009 | 10.1142/S0217751X09042633 | null | hep-ph hep-th | null | It is shown that when the mass matrix changes in orientation (rotates) in
generation space for changing energy scale, then the masses of the lower
generations are not given just by its eigenvalues. In particular, these masses
need not be zero even when the eigenvalues are zero. In that case, the strong
CP problem can be avoided by removing the unwanted $\theta$ term by a chiral
transformation in no contradiction with the nonvanishing quark masses
experimentally observed. Similarly, a rotating mass matrix may shed new light
on the problem of chiral symmetry breaking. That the fermion mass matrix may so
rotate with scale has been suggested before as a possible explanation for
up-down fermion mixing and fermion mass hierarchy, giving results in good
agreement with experiment.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:54:19 GMT"
}
] | 2009-02-09T00:00:00 | [
[
"Bordes",
"Jose",
"",
"Valencia"
],
[
"Chan",
"H. M.",
"",
"Rutherford Laboratory"
],
[
"Tsou",
"S. T.",
"",
"Oxford"
]
] |
0707.3359 | Sergei V. Ketov | Masao Iihoshi and Sergei V. Ketov | On the superstrings-induced four-dimensional gravity, and its
applications to cosmology | 33 pages, LaTeX, no figures; extensive revision, Sec.6 and references
added, stability analysis included | Adv.High Energy Phys.2008:521389,2008 | 10.1155/2008/521389 | null | hep-th gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the status of the fourth-order (quartic in the spacetime curvature)
terms induced by superstrings/M-theory (compactified on a warped torus) in the
leading order with respect to the Regge slope parameter, and study their
(non-perturbative) impact on the evolution of the Hubble scale in the context
of the four-dimensional FRW cosmology. After taking into account the quantum
ambiguities in the definition of the off-shell superstring effective action, we
propose the generalized Friedmann equations, find the existence of their (de
Sitter) exact inflationary solutions without a spacetime singularity, and
constrain the ambiguities by demanding stability and the scale factor duality
invariance of our solutions. The most naive (Bel-Robinson tensor squared)
quartic terms are ruled out, thus giving the evidence for the necessity of
extra quartic (Ricci tensor-dependent) terms in the off-shell gravitational
effective action for superstrings. Our methods are generalizable to the higher
orders in the spacetime curvature.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:57:41 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 03:42:52 GMT"
},
{
"version": "v3",
"created": "Tue, 13 Nov 2007 07:44:55 GMT"
},
{
"version": "v4",
"created": "Mon, 21 Jan 2008 10:54:05 GMT"
},
{
"version": "v5",
"created": "Tue, 17 Jun 2008 05:32:52 GMT"
},
{
"version": "v6",
"created": "Thu, 4 Sep 2008 10:26:50 GMT"
}
] | 2009-12-17T00:00:00 | [
[
"Iihoshi",
"Masao",
""
],
[
"Ketov",
"Sergei V.",
""
]
] |
0707.3360 | Gabriel Vilcu | Stere Ianus, Gabriel Eduard Vilcu | Some constructions of almost para-hyperhermitian structures on manifolds
and tangent bundles | 10 pages; This paper has been presented in the "4th German-Romanian
Seminar on Geometry" Dortmund, Germany, 15-18 July 2007 | Int. J. Geom. Methods Mod. Phys. 5, No. 6, 893-903 (2008) | 10.1142/S0219887808003016 | null | math.DG | null | In this paper we give some examples of almost para-hyperhermitian structures
on the tangent bundle of an almost product manifold, on the product manifold
$M\times\mathbb{R}$, where $M$ is a manifold endowed with a mixed 3-structure
and on the circle bundle over a manifold with a mixed 3-structure.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 10:58:47 GMT"
}
] | 2010-07-21T00:00:00 | [
[
"Ianus",
"Stere",
""
],
[
"Vilcu",
"Gabriel Eduard",
""
]
] |
0707.3361 | Ernst Joachim Weniger | Ernst Joachim Weniger | Reply to `Extended Rejoinder to "Extended Comment on "One-Range Addition
Theorems for Coulomb Interaction Potential and Its Derivatives" by I. I.
Guseinov (Chem. Phys. Vol. 309 (2005), pp. 209 - 211)", arXiv:0706.0975v2" | 38 pages, LaTeX2e, 0 figures | null | null | null | math-ph math.MP | null | In the years from 2001 to 2006, Guseinov and his coworkers published 40
articles on the derivation and application of one-range addition theorems. In
E. J. Weniger, Extended Comment on ``One-Range Addition Theorems for Coulomb
Interaction Potential and Its Derivatives'' by I. I. Guseinov (Chem. Phys. Vol.
309 (2005), pp. 209 - 213), arXiv:0704.1088v2 [math-ph], it was argued that
Guseinov's treatment of one-range addition theorems is at best questionable and
in some cases fundamentally flawed. In I. I. Guseinov, Extended Rejoinder to
"Extended Comment on "One-Range Addition Theorems for Coulomb Interaction
Potential and Its Derivatives'' by I. I. Guseinov (Chem. Phys. and Vol. 309
(2005)'', pp. 209-213), arXiv:0706.0975v2 [physics.chem-ph], these claims were
disputed. To clarify the situation, the most serious mathematical flaws in
Guseinov's treatment of one-range addition theorems are discussed in more
depth.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 11:06:50 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Weniger",
"Ernst Joachim",
""
]
] |
0707.3362 | Volker Betz | Volker Betz, Fumio Hiroshima | Gibbs measures with double stochastic integrals on a path space | 17 pages | null | null | null | math-ph math.MP | null | We investigate Gibbs measures relative to Brownian motion in the case when
the interaction energy is given by a double stochastic integral. In the case
when the double stochastic integral is originating from the Pauli-Fierz model
in nonrelativistic quantum electrodynamics, we prove the existence of its
infinite volume limit.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 11:24:48 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 21:41:36 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Betz",
"Volker",
""
],
[
"Hiroshima",
"Fumio",
""
]
] |
0707.3363 | Nanda Rea | N. Rea, E. Nichelli, G.L. Israel, R. Perna, T. Oosterbroek, A.N.
Parmar, R. Turolla, S. Campana, L. Stella, S. Zane, L. Angelini | Very deep X-ray observations of the Anomalous X-ray Pulsar 4U 0142+614 | 9 pages, 5 figures; accepted for publication on MNRAS (typos
corrected and few references added) | null | 10.1111/j.1365-2966.2007.12257.x | null | astro-ph | null | We report on two new XMM-Newton observations of the Anomalous X-ray Pulsar
(AXP) 4U 0142+614 performed in March and July 2004, collecting the most
accurate spectrum for this source to date. Furthermore, we analyse two short
archival observations performed in February 2002 and January 2003 (the latter
already reported by Gohler et al. 2005) in order to study the long term
behaviour of this AXP. 4U 0142+614 appears to be relatively steady in flux
between 2002 and 2004, and the phase-averaged spectrum does not show any
significant variability between the four epochs. We derive the deepest upper
limits to date on the presence of lines in the 4U 0142+614 spectrum as a
function of energy: equivalent width in the 1-3 keV energy range < 4 eV and < 8
eV for narrow and broad lines, respectively. A remarkable energy dependence in
both the pulse profile and the pulsed fraction is detected, and consequently
pulse-phase spectroscopy shows spectral variability as a function of phase. By
making use of XMM-Newton and INTEGRAL data, we successfully model the 1-250 keV
spectrum of 4U 0142+614 with three models presented in Rea et al. (2007a),
namely the canonical absorbed blackbody plus two power-laws, a resonant
cyclotron scattering model plus one power-law and two log-parabolic functions.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 11:31:15 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Jul 2007 16:09:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rea",
"N.",
""
],
[
"Nichelli",
"E.",
""
],
[
"Israel",
"G. L.",
""
],
[
"Perna",
"R.",
""
],
[
"Oosterbroek",
"T.",
""
],
[
"Parmar",
"A. N.",
""
],
[
"Turolla",
"R.",
""
],
[
"Campana",
"S.",
""
],
[
"Stella",
"L.",
""
],
[
"Zane",
"S.",
""
],
[
"Angelini",
"L.",
""
]
] |
0707.3364 | Christian Pauly | Christian Pauly (I3M) | On the base locus of the linear system of generalized theta functions | 4 pages | null | null | null | math.AG | null | Let $\cM_r$ denote the moduli space of semi-stable rank-$r$ vector bundles
with trivial determinant over a smooth projective curve $C$ of genus $g$. In
this paper we study the base locus $\cB_r \subset \cM_r$ of the linear system
of the determinant line bundle $\cL$ over $\cM_r$, i.e., the set of semi-stable
rank-$r$ vector bundles without theta divisor. We construct base points in
$\cB_{g+2}$ over any curve $C$, and base points in $\cB_4$ over any
hyperelliptic curve.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 11:47:56 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Apr 2008 17:34:47 GMT"
}
] | 2008-04-14T00:00:00 | [
[
"Pauly",
"Christian",
"",
"I3M"
]
] |
0707.3365 | Sara Perez | S. Perez-Martin and L.M. Robledo | Generalized Wick's theorem for multiquasiparticle overlaps as a limit of
Gaudin's theorem | 28 pages | Phys.Rev.C76:064314,2007 | 10.1103/PhysRevC.76.064314 | null | nucl-th | null | We are able to rederive in a very simple way the standard generalized Wick's
theorem for overlaps of mean field wave functions by using the extension of the
statistical Wick's theorem (Gaudin's theorem) in the appropriate limits.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:06:40 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Nov 2007 08:45:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Perez-Martin",
"S.",
""
],
[
"Robledo",
"L. M.",
""
]
] |
0707.3366 | Santiago Noguera | A. Courtoy, S. Noguera | The Pion-Photon Transition Distribution Amplitudes in the Nambu-Jona
Lasinio Model | 14 pag. and 6 fig, final version (to appear in Phys. Rev. D) | Phys.Rev.D76:094026,2007 | 10.1103/PhysRevD.76.094026 | null | hep-ph | null | We define the pion-photon Transition Distribution Amplitudes (TDA) in a field
theoretic formalism from a covariant Bethe-Salpeter approach for the
determination of the bound state. We apply our formalism to the Nambu - Jona
Lasinio model, as a realistic theory of the pion. The obtained vector and axial
TDAs satisfy all features required by general considerations. In particular,
sum rules and polynomiality condition are explicitly verified. We have
numerically proved that the odd coefficients in the polynomiality expansion of
the vector TDA vanish in the chiral limit. The role of PCAC and the presence of
a pion pole are explicitly shown.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:49:48 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 10:03:19 GMT"
},
{
"version": "v3",
"created": "Thu, 29 Nov 2007 12:53:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Courtoy",
"A.",
""
],
[
"Noguera",
"S.",
""
]
] |
0707.3367 | Sanjib Kumar Agarwalla | Sanjib Kumar Agarwalla, Sandhya Choubey, Amitava Raychaudhuri | Magic Baseline Beta Beam | 4 pages, 2 figures, Latex (style files included); Talk presented by
S.K.A. at the International workshop on Theoretical High Energy Physics
(IWTHEP 2007), Roorkee, India, 15-20 March, 2007, to appear in the
proceedings | AIPConf.Proc.939:265-268,2007 | 10.1063/1.2803813 | HRI-P-07-07-004 | hep-ph hep-ex | null | We study the physics reach of an experiment where neutrinos produced in a
beta-beam facility at CERN are observed in a large magnetized iron calorimeter
(ICAL) at the India-based Neutrino Observatory (INO). The CERN-INO distance is
close to the so-called "magic" baseline which helps evade some of the parameter
degeneracies and allows for a better measurement of the neutrino mass hierarchy
and $\theta_{13}$.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:24:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Raychaudhuri",
"Amitava",
""
]
] |
0707.3368 | Stuart Lowe | S. R. Lowe (1), M. P. Gawro\'nski (2), P. N. Wilkinson (1), A. J. Kus
(2), I. W. A. Browne (1), E. Pazderski (2), R. Feiler (2) and D. Kettle (3)
((1) Jodrell Bank Observatory (2) Toru\'n Centre for Astronomy (3) School of
Electrical and Electronic Engineering, University of Manchester) | 30 GHz flux density measurements of the Caltech-Jodrell flat-spectrum
sources with OCRA-p | 9 pages, 2 figures, 2 Tables, submitted to Astronomy & Astrophysics | null | 10.1051/0004-6361:20078034 | null | astro-ph | null | To measure the 30-GHz flux densities of the 293 sources in the
Caltech-Jodrell Bank flat-spectrum (CJF) sample. The measurements are part of
an ongoing programme to measure the spectral energy distributions of flat
spectrum radio sources and to correlate them with the milliarcsecond structures
from VLBI and other measured astrophysical properties. The 30-GHz data were
obtained with a twin-beam differencing radiometer system mounted on the Torun
32-m telescope. The system has an angular resolution of 1.2 arcmin. Together
with radio spectral data obtained from the literature, the 30-GHz data have
enabled us to identify 42 of the CJF sources as Giga-hertz Peaked Spectrum
(GPS) sources. Seventeen percent of the sources have rising spectra (alpha > 0)
between 5 and 30 GHz.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:29:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lowe",
"S. R.",
""
],
[
"Gawroński",
"M. P.",
""
],
[
"Wilkinson",
"P. N.",
""
],
[
"Kus",
"A. J.",
""
],
[
"Browne",
"I. W. A.",
""
],
[
"Pazderski",
"E.",
""
],
[
"Feiler",
"R.",
""
],
[
"Kettle",
"D.",
""
]
] |
0707.3369 | Martina Queck | Martina Queck (1), Alexander V. Krivov (1), Miodrag Sremcevic (2) and
Philippe Thebault (3, 4) ((1) Astrophysikalisches Institut und
Universitaets-Sternwarte Jena, Germany, (2) LASP Boulder, Colorado, (3)
Stockholm Observatory, Albanova Universitetcentrum, Sweden, (4) LESIA,
Observatoire de Paris, France) | Collisional Velocities and Rates in Resonant Planetesimal Belts | 31 pages, 11 figures (some of them heavily compressed to fit into
arxiv-maximum filesize), accepted for publication at "Celestial Mechanics and
Dynamical Astronomy" | null | 10.1007/s10569-007-9095-4 | null | astro-ph | null | We consider a belt of small bodies around a star, captured in one of the
external or 1:1 mean-motion resonances with a massive perturber. The objects in
the belt collide with each other. Combining methods of celestial mechanics and
statistical physics, we calculate mean collisional velocities and collisional
rates, averaged over the belt. The results are compared to collisional
velocities and rates in a similar, but non-resonant belt, as predicted by the
particle-in-a-box method. It is found that the effect of the resonant lock on
the velocities is rather small, while on the rates more substantial. The
collisional rates between objects in an external resonance are by about a
factor of two higher than those in a similar belt of objects not locked in a
resonance. For Trojans under the same conditions, the collisional rates may be
enhanced by up to an order of magnitude. Our results imply, in particular,
shorter collisional lifetimes of resonant Kuiper belt objects in the solar
system and higher efficiency of dust production by resonant planetesimals in
debris disks around other stars.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:49:27 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Queck",
"Martina",
""
],
[
"Krivov",
"Alexander V.",
""
],
[
"Sremcevic",
"Miodrag",
""
],
[
"Thebault",
"Philippe",
""
]
] |
0707.3370 | Thomas Duyckaerts | Valeria Banica (DP), Thomas Duyckaerts (AGM) | Weighted Strichartz estimates for radial Schr\"odinger equation on
noncompact manifolds | null | null | null | null | math.AP | null | We prove global weighted Strichartz estimates for radial solutions of linear
Schr\"odinger equation on a class of rotationally symmetric noncompact
manifolds, generalizing the known results on hyperbolic and Damek-Ricci spaces.
This yields classical Strichartz estimates with a larger class of exponents
than in the Euclidian case and improvements for the scattering theory. The
manifolds, whose volume element grows polynomially or exponentially at
infinity, are characterized essentially by negativity conditions on the
curvature, which shows in particular that the rich algebraic structure of the
Hyperbolic and Damek-Ricci spaces is not the cause of the improved dispersive
properties of the equation. The proofs are based on known dispersive results
for the equation with potential on the Euclidean space, and on a new one, valid
for C^1 potentials decaying like 1/r^2 at infinity.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:35:50 GMT"
},
{
"version": "v2",
"created": "Sun, 19 Aug 2007 18:53:52 GMT"
}
] | 2007-08-19T00:00:00 | [
[
"Banica",
"Valeria",
"",
"DP"
],
[
"Duyckaerts",
"Thomas",
"",
"AGM"
]
] |
0707.3371 | Igor Shparlinski | Igor E. Shparlinski | Approximation by Several Rationals | null | null | null | null | math.NT | null | Following T. H. Chan, we consider the problem of approximation of a given
rational fraction a/q by sums of several rational fractions a_1/q_1, ...,
a_n/q_n with smaller denominators. We show that in the special cases of n=3 and
n=4 and certain admissible ranges for the denominators q_1,..., q_n, one can
improve a result of T. H. Chan by using a different approach.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:42:35 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Shparlinski",
"Igor E.",
""
]
] |
0707.3372 | Alessandro Bacchetta | Alessandro Bacchetta (DESY), Leonard P. Gamberg (Penn State U.), Gary
R. Goldstein (Tufts U.), Asmita Mukherjee (Indian Inst. Tech., Mumbai) | Collins fragmentation function for pions and kaons in a spectator model | null | Phys.Lett.B659:234-243,2008 | 10.1016/j.physletb.2007.09.076 | DESY 07-105 | hep-ph | null | We calculate the Collins fragmentation function in the framework of a
spectator model with pseudoscalar pion-quark coupling and a Gaussian form
factor at the vertex. We determine the model parameters by fitting the
unpolarized fragmentation function for pions and kaons. We show that the
Collins function for the pions in this model is in reasonable agreement with
recent parametrizations obtained by fits of the available data. In addition, we
compute for the first time the Collins function for the kaons.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:17:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bacchetta",
"Alessandro",
"",
"DESY"
],
[
"Gamberg",
"Leonard P.",
"",
"Penn State U."
],
[
"Goldstein",
"Gary R.",
"",
"Tufts U."
],
[
"Mukherjee",
"Asmita",
"",
"Indian Inst. Tech., Mumbai"
]
] |
0707.3373 | Oleg Verbitsky | Mihyun Kang, Mathias Schacht, Oleg Verbitsky | How Much Work Does It Take To Straighten a Plane Graph Out? | 9 pages, the 2nd version includes literally the first version and is
appended with new Appendices A and B | null | null | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that if one wants to make a plane graph drawing straight-line then
in the worst case one has to move almost all vertices.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:46:25 GMT"
},
{
"version": "v2",
"created": "Sun, 7 Jun 2009 22:23:39 GMT"
}
] | 2009-06-08T00:00:00 | [
[
"Kang",
"Mihyun",
""
],
[
"Schacht",
"Mathias",
""
],
[
"Verbitsky",
"Oleg",
""
]
] |
0707.3374 | Santiago Madruga | Uwe Thiele, Santiago Madruga, Lubor Frastia | Decomposition driven interface evolution for layers of binary mixtures:
I. Model derivation and stratified base states | Submitted to Physics of Fluids | Phys. Fluids 19, 122106 (2007) | 10.1063/1.2824404 | null | physics.flu-dyn | null | A dynamical model is proposed to describe the coupled decomposition and
profile evolution of a free surface film of a binary mixture. An example is a
thin film of a polymer blend on a solid substrate undergoing simultaneous phase
separation and dewetting. The model is based on model-H describing the coupled
transport of the mass of one component (convective Cahn-Hilliard equation) and
momentum (Navier-Stokes-Korteweg equations) supplemented by appropriate
boundary conditions at the solid substrate and the free surface.
General transport equations are derived using phenomenological
non-equilibrium thermodynamics for a general non-isothermal setting taking into
account Soret and Dufour effects and interfacial viscosity for the internal
diffuse interface between the two components. Focusing on an isothermal setting
the resulting model is compared to literature results and its base states
corresponding to homogeneous or vertically stratified flat layers are analysed.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:50:24 GMT"
}
] | 2013-03-25T00:00:00 | [
[
"Thiele",
"Uwe",
""
],
[
"Madruga",
"Santiago",
""
],
[
"Frastia",
"Lubor",
""
]
] |
0707.3375 | Philip Boalch | Philip Boalch | Towards a nonlinear Schwarz's list | 28 pages | null | null | null | math.CA math.AG nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is basically the text of a survey talk (entitled 'Painleve, Klein and
the icosahedron') given at Hitchin's 60th birthday conference. It discusses the
search for and construction of algebraic solutions of the sixth Painleve
differential equation, which may be viewed as a nonlinear analogue of the Gauss
hypergeometric equation. Both algebraic and transcendental methods are used and
the story involves affine Weyl groups, braid groups and cubic surfaces. Some
emphasis is given to the interpretation of the sixth Painleve equation as the
explicit form of the simplest nonabelian Gauss-Manin connection, i.e. as a
nonlinear differential equation 'coming from geometry', much as Picard-Fuchs
equations arise in the case of cohomology with abelian coefficients.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 12:51:13 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jul 2008 01:07:08 GMT"
}
] | 2008-08-01T00:00:00 | [
[
"Boalch",
"Philip",
""
]
] |
0707.3376 | Yohan Dubois | Yohan Dubois and Romain Teyssier | On the onset of galactic winds in quiescent star forming galaxies | 19 pages, 13 figures, 1 table, submited to A&A | null | 10.1051/0004-6361:20078326 | null | astro-ph | null | We studied the effect of supernovae feedback on a disk galaxy, taking into
account the impact of infalling gas on both the star formation history and the
corresponding outflow structure, the apparition of a supernovae-driven wind
being highly sensitive to the halo mass, the galaxy spin and the star formation
efficiency. We model our galaxies as cooling and collapsing NFW spheres. The
dark matter component is modelled as a static external potential, while the
baryon component is described by the Euler equations using the AMR code RAMSES.
Metal-dependent cooling and supernovae-heating are also implemented using
state-of-the-art recipes coming from cosmological simulations. We allow for 3
parameters to vary: the halo circular velocity, the spin parameter and the star
formation efficiency. We found that the ram pressure of infalling material is
the key factor limiting the apparition of galactic winds. We obtain a very low
feedback efficiency, with supernovae to wind energy conversion factor around
one percent, so that only low cicrular velocity galaxies give rise to strong
winds. For massive galaxies, we obtain a galatic fountain, for which we discuss
the observational properties. We conclude that for quiescent isolated galaxies,
galactic winds appear only in very low mass systems. Although that can quite
efficiently enrich the IGM with metals, they don't carry away enough cold
material to solve the overcooling problem.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 13:11:09 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Sep 2007 09:57:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dubois",
"Yohan",
""
],
[
"Teyssier",
"Romain",
""
]
] |
0707.3377 | David Seery | David Seery | One-loop corrections to a scalar field during inflation | 33 pages, uses feynmp.sty and ioplatex journal style. v2: matches
version published in JCAP. v3: corrects sign error in Eq. (58). Corrects
final coefficient of the logarithm in Eq. (105). Small corrections to
discussion of divergences in 1-point function. Minor improvements to
discussion of UV behaviour in Sec. 4.2 | JCAP 0711:025,2007 | 10.1088/1475-7516/2007/11/025 | null | astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The leading quantum correction to the power spectrum of a
gravitationally-coupled light scalar field is calculated, assuming that it is
generated during a phase of single-field, slow-roll inflation.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:40:35 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 10:47:45 GMT"
},
{
"version": "v3",
"created": "Mon, 8 Feb 2010 22:43:12 GMT"
}
] | 2010-02-09T00:00:00 | [
[
"Seery",
"David",
""
]
] |
0707.3378 | David Seery | David Seery | One-loop corrections to the curvature perturbation from inflation | 28 pages, uses feynmp.sty and ioplatex journal style. v2: supersedes
version published in JCAP. Some corrections and refinements to the discussion
and conclusions. v3: Corrects misidentification of quantum correction with an
IR effect. Improvements to the discussion | JCAP 0802:006,2008 | 10.1088/1475-7516/2008/02/006 | null | astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An estimate of the one-loop correction to the power spectrum of the
primordial curvature perturbation is given, assuming it is generated during a
phase of single-field, slow-roll inflation. The loop correction splits into two
parts, which can be calculated separately: a purely quantum-mechanical
contribution which is generated from the interference among quantized field
modes around the time when they cross the horizon, and a classical contribution
which comes from integrating the effect of field modes which have already
passed far beyond the horizon. The loop correction contains logarithms which
may invalidate the use of naive perturbation theory for cosmic microwave
background (CMB) predictions when the scale associated with the CMB is
exponentially different from the scale at which the fundamental theory which
governs inflation is formulated.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:35:52 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 13:25:48 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Feb 2010 00:03:02 GMT"
}
] | 2010-02-09T00:00:00 | [
[
"Seery",
"David",
""
]
] |
0707.3379 | Dieter Schildknecht | Dieter Schildknecht | The ratio of sigma_L/sigma_T in DIS at low x | 4 pages, 4 figures, contribution to the proceedings of DIS2007 | null | null | null | hep-ph | null | Assuming helicity independence for q-qbar scattering in the color-dipole
picture, or, equivalently proportionality of sea quark and gluon distributions,
we find R(W^2,Q^2) = 0.5 (approximately) at large Q^2, where R(W^2,Q^2) denotes
the ratio of the longitudinal and transverse photoabsorption cross sections.
The forthcoming direct measurements of R(W^2,Q^2) allow one to test the
underlying hypotheses.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 13:29:21 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Schildknecht",
"Dieter",
""
]
] |
0707.3380 | David H. Weinberg | Jennifer K. Adelman-McCarthy, et al. (for the SDSS Collaboration) | The Fifth Data Release of the Sloan Digital Sky Survey | ApJ Supp, in press, October 2007. This paper describes DR5. The SDSS
Sixth Data Release (DR6) is now public, available from http://www.sdss.org | Astrophys.J.Suppl.172:634-644,2007 | 10.1086/518864 | null | astro-ph | null | This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky
Survey (SDSS). DR5 includes all survey quality data taken through June 2005 and
represents the completion of the SDSS-I project (whose successor, SDSS-II will
continue through mid-2008). It includes five-band photometric data for 217
million objects selected over 8000 square degrees, and 1,048,960 spectra of
galaxies, quasars, and stars selected from 5713 square degrees of that imaging
data. These numbers represent a roughly 20% increment over those of the Fourth
Data Release; all the data from previous data releases are included in the
present release. In addition to "standard" SDSS observations, DR5 includes
repeat scans of the southern equatorial stripe, imaging scans across M31 and
the core of the Perseus cluster of galaxies, and the first spectroscopic data
from SEGUE, a survey to explore the kinematics and chemical evolution of the
Galaxy. The catalog database incorporates several new features, including
photometric redshifts of galaxies, tables of matched objects in overlap regions
of the imaging survey, and tools that allow precise computations of survey
geometry for statistical investigations.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 13:31:01 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Adelman-McCarthy",
"Jennifer K.",
""
]
] |
0707.3381 | Fr\'ed\'eric Leroy | F. Leroy, R. Lazzari, G. Renaud | X-ray scattering from stepped and kinked surfaces: An approach with the
paracrystal model | 33 pages, 18 figures | Science Volume 601, Issue 9, 1 May 2007, Pages 1915-1929 | 10.1016/j.susc.2007.02.020 | null | cond-mat.mtrl-sci | null | A general formalism of X-ray scattering from different kinds of surface
morphologies is described. Based on a description of the surface morphology at
the atomic scale through the use of the paracrystal model and discrete
distributions of distances, the scattered intensity by non-periodic surfaces is
calculated over the whole reciprocal space. In one dimension, the scattered
intensity by a vicinal surface, the two-level model, the N-level model, the
faceted surface and the rough surface are addressed. In two dimensions, the
previous results are generalized to the kinked vicinal surface, the two-level
vicinal surface and the step meandering on a vicinal surface. The concept of
crystal truncation rod is generalized considering also the truncation of a
terrace by a step (yielding a terrace truncation rod) and a step by a kink
(yielding a step truncation rod).
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 01:21:03 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Leroy",
"F.",
""
],
[
"Lazzari",
"R.",
""
],
[
"Renaud",
"G.",
""
]
] |
0707.3382 | Yuko Okamoto | Yuji Sugita (RIKEN), Ayori Mitsutake (Keio University), and Yuko
Okamoto (Nagoya University) | Generalized-Ensemble Algorithms for Protein Folding Simulations | 37 pages, (LaTeX2e), 5 figures | null | null | null | cond-mat.stat-mech cond-mat.soft | null | Conventional simulations of complex systems in the canonical ensemble suffer
from the quasi-ergodicity problem. A simulation in generalized ensemble
overcomes this difficulty by performing a random walk in potential energy space
and other parameter space. From only one simulation run, one can obtain
canonical-ensemble averages of physical quantities as functions of temperature
by the single-histogram and/or multiple-histogram reweighting techniques. In
this article we review the generalized-ensemble algorithms. Three well-known
methods, namely, multicanonical algorithm, simulated tempering, and
replica-exchange method, are described first. Both Monte Carlo and molecular
dynamics versions of the algorithms are given. We then present further
extensions of the above three methods.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 13:42:24 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Sugita",
"Yuji",
"",
"RIKEN"
],
[
"Mitsutake",
"Ayori",
"",
"Keio University"
],
[
"Okamoto",
"Yuko",
"",
"Nagoya University"
]
] |
0707.3383 | Raffaele Romano | Raffaele Romano | Relaxation to equilibrium driven via indirect control in Markovian
dynamics | revtex4, 7 pages | Phys. Rev. A 76, 042315 (2007) | 10.1103/PhysRevA.76.052115 | null | quant-ph | null | We characterize to what extent it is possible to modify the stationary states
of a quantum dynamical semigroup, that describes the irreversible evolution of
a two-level system, by means of an auxiliary two-level system. We consider
systems that can be initially entangled or uncorrelated. We find that the
indirect control of the stationary states is possible, even if there are not
initial correlations, under suitable conditions on the dynamical parameters
characterizing the evolution of the joint system.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 13:47:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Romano",
"Raffaele",
""
]
] |
0707.3384 | Leszek Hadasz | Leszek Hadasz | On the fusion matrix of the N=1 Neveu-Schwarz blocks | 28 pages, no figures | JHEP0712:071,2007 | 10.1088/1126-6708/2007/12/071 | null | hep-th | null | We propose an exact form of the fusion matrix of the Neveu-Schwarz blocks
that appear in a correlation function of four super-primary fields.
Orthogonality relation satisfied by this matrix is equivalent to the bootstrap
equation for the four-point super-primary correlator in the N=1 supersymmetric
Liouville theory.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:24:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hadasz",
"Leszek",
""
]
] |
0707.3385 | Alain Leger | Alain Leger, Tom Herbst, et al | DARWIN mission proposal to ESA | This a compressed version of the DARWIN mission proposal to ESA for
its "Cosmic Vision" 2015-2025 program A full resolution version can be
obtained from the Web site indicated on the cover page | null | null | null | astro-ph | null | The discovery of extra-solar planets is one of the greatest achievements of
modern astronomy. There are now more than 200 such objects known, and the
recent detection of planets with masses approximately 5 times that of Earth
demonstrates that extra-solar planets of low mass exist. In addition to
providing a wealth of scientific information on the formation and structure of
planetary systems, these discoveries capture the interest of both scientists
and the wider public with the profound prospect of the search for life in the
Universe. We propose an L-type mission, called Darwin, whose primary goal is
the study of terrestrial extrasolar planets and the search for life on them. By
its very nature, Darwin advances the first Grand Theme of ESA Cosmic Vision.
Accomplishing the mission objectives will require collaborative science across
disciplines ranging from planet formation and atmospheres to chemistry and
biology, and these disciplines will reap profound rewards from their
contributions to the Darwin mission.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:21:16 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Leger",
"Alain",
""
],
[
"Herbst",
"Tom",
""
]
] |
0707.3386 | Anatoly Nikitin | J. Niederle and A.G. Nikitin | Galilei invariant theories. III. Wave equations for massless fields | 17 pages | null | null | null | math-ph math.MP quant-ph | null | Galilei invariant equations for massless fields are obtained via contractions
of relativistic wave equations. It is shown that the collection of
non-equivalent Galilei-invariant wave equations for massless fields with spin
equal 1 and 0 is very broad and describes many physically consistent systems.
In particular, there exist a huge number of such equations for massless fields
which correspond to various contractions of representations of the Lorentz
group to those of the Galilei one.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:22:32 GMT"
}
] | 2007-07-25T00:00:00 | [
[
"Niederle",
"J.",
""
],
[
"Nikitin",
"A. G.",
""
]
] |
0707.3387 | Rodrigo Holanda | R. F. L. Holanda, S. H. Pereira | On the dynamics of the universe in $D$ spatial dimensions | 10 pages, 2 figures, Revista Mexicana de Astronom\'ia y Astrof\'isica
(in Press). arXiv admin note: text overlap with arXiv:astro-ph/0109215 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present the equations of the evolution of the universe in
$D$ spatial dimensions, as a generalization of the work of Lima \citep{lima}.
We discuss the Friedmann-Robertson-Walker cosmological equations in $D$ spatial
dimensions for a simple fluid with equation of state $p=\omega_{D}\rho$. It is
possible to reduce the multidimensional equations to the equation of a point
particle system subject to a linear force. This force can be expressed as an
oscillator equation, anti-oscillator or a free particle equation, depending on
the $k$ parameter of the spatial curvature. An interesting result is the
independence on the dimension $D$ in a de Sitter evolution. We also stress the
generality of this procedure with a cosmological $\Lambda$ term. A more
interesting result is that the reduction of the dimensionality leads naturally
to an accelerated expansion of the scale factor in the plane case.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 18:17:10 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jul 2012 21:45:20 GMT"
}
] | 2012-07-09T00:00:00 | [
[
"Holanda",
"R. F. L.",
""
],
[
"Pereira",
"S. H.",
""
]
] |
0707.3388 | Dmitri Volchenkov | D. Volchenkov, Ph. Blanchard | Complex Networks in and beyond Physics | 6 pages, PDF file: an outlook on complex networks in physics,
society, and linguistics | null | null | null | physics.pop-ph physics.soc-ph | null | Physicists study a wide variety of phenomena creating new interdisciplinary
research fields by applying theories and methods originally developed in
physics in order to solve problems in economics, social science, biology,
medicine, technology, etc. In their turn, these different branches of science
inspire the invention of new concepts in physics. A basic tool of analysis, in
such a context, is the mathematical theory of complexity concerned with the
study of complex systems including human economies, climate, nervous systems,
cells and living things, including human beings, as well as modern energy or
communication infrastructures which are all networks of some kind. Recently,
complexity has become a natural domain of interest of the real world
socio-cognitive systems, linguistics, and emerging systemics research. The
phenomena to be studied and understood arise from neither the physical laws nor
the abstraction of mathematics. The challenge is to discern and formulate
plausible mathematical structures to describe problems that represent vague
human goals.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:29:09 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Volchenkov",
"D.",
""
],
[
"Blanchard",
"Ph.",
""
]
] |
0707.3389 | Paolo Finelli Dr. | P. Finelli, N. Kaiser, D. Vretenar, W. Weise | In-medium chiral SU(3) dynamics and hypernuclear structure | 10 pages, 2 figures, elsart class. Minor revisions | Phys.Lett.B658:90-94,2007 | 10.1016/j.physletb.2007.09.070 | null | nucl-th | null | A previously introduced relativistic energy density functional, successfully
applied to ordinary nuclei, is extended to hypernuclei. The density-dependent
mean field and the spin-orbit potential are consistently calculated for a
$\Lambda$ hyperon in the nucleus using the SU(3) extension of in-medium chiral
perturbation theory. The leading long range $\Lambda N$ interaction arises from
kaon-exchange and $2\pi$-exchange with $\Sigma$ hyperon in the intermediate
state. Scalar and vector mean fields reflecting in-medium changes of the quark
condensates are constrained by QCD sum rules. The model, applied to oxygen as a
test case, describes spectroscopic data in good agreement with experiment. In
particular, the smallness of the $\Lambda$ spin-orbit interaction finds a
natural explanation in terms of an almost complete cancellation between
scalar-vector background contributions and long-range terms generated by
two-pion exchange.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:31:27 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Dec 2007 14:16:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Finelli",
"P.",
""
],
[
"Kaiser",
"N.",
""
],
[
"Vretenar",
"D.",
""
],
[
"Weise",
"W.",
""
]
] |
0707.3390 | Francis Bach | Francis Bach (WILLOW Project - Inria/Ens) | Consistency of the group Lasso and multiple kernel learning | null | null | null | null | cs.LG | null | We consider the least-square regression problem with regularization by a
block 1-norm, i.e., a sum of Euclidean norms over spaces of dimensions larger
than one. This problem, referred to as the group Lasso, extends the usual
regularization by the 1-norm where all spaces have dimension one, where it is
commonly referred to as the Lasso. In this paper, we study the asymptotic model
consistency of the group Lasso. We derive necessary and sufficient conditions
for the consistency of group Lasso under practical assumptions, such as model
misspecification. When the linear predictors and Euclidean norms are replaced
by functions and reproducing kernel Hilbert norms, the problem is usually
referred to as multiple kernel learning and is commonly used for learning from
heterogeneous data sources and for non linear variable selection. Using tools
from functional analysis, and in particular covariance operators, we extend the
consistency results to this infinite dimensional case and also propose an
adaptive scheme to obtain a consistent model estimate, even when the necessary
condition required for the non adaptive scheme is not satisfied.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:35:20 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 10:10:31 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Bach",
"Francis",
"",
"WILLOW Project - Inria/Ens"
]
] |
0707.3391 | Redamy Perez Ramos | Fran\c{c}ois Arleo (CERN), Redamy Perez Ramos (LPTHE), Bruno Machet
(LPTHE) | Hadronic single inclusive kt distributions inside one jet beyond MLLA | 4 pages, 5 figures. Minor changes and addenda. Version to appear in
Phys. Rev. Lett | Phys.Rev.Lett.100:052002,2008 | 10.1103/PhysRevLett.100.052002 | null | hep-ph hep-ex | null | The hadronic kt-spectrum inside one jet is determined including corrections
of relative magnitude sqrt{alpha_s} with respect to the Modified Leading
Logarithmic Approximation (MLLA), at and beyond the limiting spectrum (assuming
an infrared cut-off Q_0 = Lambda_QCD and Q_0 not = Lambda_QCD). The agreement
between our results and preliminary measurements by the CDF collaboration is
impressive, much better than at MLLA, pointing out very small overall
non-perturbative contributions.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:37:03 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 13:20:49 GMT"
}
] | 2010-03-25T00:00:00 | [
[
"Arleo",
"François",
"",
"CERN"
],
[
"Ramos",
"Redamy Perez",
"",
"LPTHE"
],
[
"Machet",
"Bruno",
"",
"LPTHE"
]
] |
0707.3392 | Douglas Galvao | Karl M. Garcez, David L. Azevedo, Douglas S. Galv\~ao | Neon Atoms Oscillating Inside Carbon and Boron-Nitride Nanotubes: A
Fully Atomistic Molecular Dynamics Investigation | null | null | null | null | cond-mat.mtrl-sci | null | In the present work we discuss based on extensive fully atomistic molecular
dynamics simulations the dynamics of Neon atoms oscillating inside
(5,5)single-walled carbon nanotubes (CNTs) and boron-nitride (BNNT) ones. Our
results show that sustained high frequency oscillatory regimes are possible for
a large range of temperatures. Our results also show that the general features
of the oscillations are quite similar to CNT and BNNT, in contrast with some
speculations in previous work literature about the importance of broken
symmetry and chirality exhibited by BNNTs.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:41:03 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Garcez",
"Karl M.",
""
],
[
"Azevedo",
"David L.",
""
],
[
"Galvão",
"Douglas S.",
""
]
] |
0707.3393 | Joe Hooper | Joe Hooper, Valentino R. Cooper, T. Thonhauser, Nichols A. Romero,
Frank Zerilli, and David C. Langreth | Predicting C-H/$\pi$ interactions with nonlocal density functional
theory | 5 pages, 4 figures | J. Hooper et al, Chem. Phys. Chem. 9, 891 (2008) | 10.1063/1.2833065 | null | cond-mat.mtrl-sci | null | We examine the performance of a recently developed nonlocal density
functional in predicting a model noncovalent interaction, the weak bond between
an aromatic $\pi$ system and an aliphatic C-H group. The new functional is a
significant improvement over traditional density functionals, providing results
which compare favorably to high-level quantum-chemistry techniques but at
considerably lower computational cost. Interaction energies in several model
C-H/$\pi$ systems are in generally good agreement with coupled-cluster
calculations, though equilibrium distances are consistently overpredicted when
using the revPBE functional for exchange. The new functional correctly predicts
changes in energy upon addition of halogen substituents.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 14:45:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hooper",
"Joe",
""
],
[
"Cooper",
"Valentino R.",
""
],
[
"Thonhauser",
"T.",
""
],
[
"Romero",
"Nichols A.",
""
],
[
"Zerilli",
"Frank",
""
],
[
"Langreth",
"David C.",
""
]
] |
0707.3394 | Vladimir Nikiforov | Vladimir Nikiforov | Turan's theorem inverted | Some polishing. Updated references | null | null | null | math.CO | null | Turan's theorem implies that every graph of order n with more edges than the
r-partite Turan graph contains a complete graph of order r+1. We show that the
same premise implies the existence of much larger graphs. We also prove
corresponding stability theorems. These results complete work started by Erdos
in 1963.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 19:18:25 GMT"
},
{
"version": "v2",
"created": "Thu, 22 Nov 2007 00:21:05 GMT"
}
] | 2007-11-22T00:00:00 | [
[
"Nikiforov",
"Vladimir",
""
]
] |
0707.3395 | Marko Vojinovic | Milovan Vasilic, Marko Vojinovic | Classical Spinning Branes in Curved Backgrounds | null | JHEP 0707:028,2007 | 10.1088/1126-6708/2007/07/028 | null | gr-qc hep-th | null | The dynamics of a classical branelike object in a curved background is
derived from the covariant stress-energy conservation of the brane matter. The
world sheet equations and boundary conditions are obtained in the pole-dipole
approximation, where nontrivial brane thickness gives rise to its intrinsic
angular momentum. It is shown that intrinsic angular momentum couples to both,
the background curvature and the brane orbital degrees of freedom. The whole
procedure is manifestly covariant with respect to spacetime diffeomorphisms and
world sheet reparametrizations. In addition, two extra gauge symmetries are
discovered and utilized. The examples of the point particle and the string in 4
spacetime dimensions are analyzed in more detail. A particular attention is
paid to the Nambu-Goto string with massive spinning particles attached to its
ends.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 19:51:48 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 15:13:20 GMT"
}
] | 2010-01-15T00:00:00 | [
[
"Vasilic",
"Milovan",
""
],
[
"Vojinovic",
"Marko",
""
]
] |
0707.3396 | Nail Khusnutdinov | Nail R. Khusnutdinov and Ilya V. Bakhmatov | Self-force of a point charge in the space-time of a symmetric wormhole | 18 pages, 3 figures Comments: corrected pdf, enlarged paper | Phys.Rev.D76:124015,2007 | 10.1103/PhysRevD.76.124015 | null | gr-qc | null | We consider the self-energy and the self-force for an electrically charged
particle at rest in the wormhole space-time. We develop general approach and
apply it to two specific profiles of the wormhole throat with singular and with
smooth curvature. The self-force for these two profiles is found in manifest
form; it is an attractive force. We also find an expression for the self-force
in the case of arbitrary symmetric throat profile. Far from the throat the
self-force is always attractive.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 15:21:56 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jul 2007 07:27:48 GMT"
},
{
"version": "v3",
"created": "Fri, 26 Oct 2007 10:46:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Khusnutdinov",
"Nail R.",
""
],
[
"Bakhmatov",
"Ilya V.",
""
]
] |
0707.3397 | Bo-Qiang Ma | Yan Chen, Bo-Qiang Ma | Mixing of 1/2^- Octets under SU(3) Symmetry | 8 latex pages | Mod.Phys.Lett.A23:703-710,2008 | 10.1142/S0217732308024031 | null | hep-ph | null | We investigate the J^p=1/2^- baryons in the octets based on flavor SU(3)
symmetry. Since baryons with same quantum numbers can mix with each other, we
consider the mixing between two octets before their mixing with the singlet.
Most predicted decay widths are consistent with the experimental data, and
meanwhile we predict two possible $\Xi$ mass ranges of the two octets.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 15:32:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chen",
"Yan",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
0707.3398 | Ilja Gerhardt | Gert Wrigge, Ilja Gerhardt, Jaesuk Hwang, Gert Zumofen and Vahid
Sandoghdar | Efficient coupling of photons to a single molecule and the observation
of its resonance fluorescence | 6 figures | Nature Physics 4, 60 - 66 (2008) | 10.1038/nphys812 | null | quant-ph | null | Single dye molecules at cryogenic temperatures display many spectroscopic
phenomena known from free atoms and are thus promising candidates for
fundamental quantum optical studies. However, the existing techniques for the
detection of single molecules have either sacrificed the information on the
coherence of the excited state or have been inefficient. Here we show that
these problems can be addressed by focusing the excitation light near to the
absorption cross section of a molecule. Our detection scheme allows us to
explore resonance fluorescence over 9 orders of magnitude of excitation
intensity and to separate its coherent and incoherent parts. In the strong
excitation regime, we demonstrate the first observation of the Mollow triplet
from a single solid-state emitter. Under weak excitation we report the
detection of a single molecule with an incident power as faint as 150 attoWatt,
paving the way for studying nonlinear effects with only a few photons.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 15:33:36 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Wrigge",
"Gert",
""
],
[
"Gerhardt",
"Ilja",
""
],
[
"Hwang",
"Jaesuk",
""
],
[
"Zumofen",
"Gert",
""
],
[
"Sandoghdar",
"Vahid",
""
]
] |
0707.3399 | Jos\'e Gaite | Jose Gaite, Angel Sanz-Andr\'es and Isabel P\'erez-Grande | Nonlinear analysis of a simple model of temperature evolution in a
satellite | 13 pages, 4 figures (5 EPS files) | Nonlinear Dynamics 58 (2009) 405 - 415 | 10.1007/s11071-009-9488-x | null | physics.space-ph math-ph math.MP nlin.CD | null | We analyse a simple model of the heat transfer to and from a small satellite
orbiting round a solar system planet. Our approach considers the satellite
isothermal, with external heat input from the environment and from internal
energy dissipation, and output to the environment as black-body radiation. The
resulting nonlinear ordinary differential equation for the satellite's
temperature is analysed by qualitative, perturbation and numerical methods,
which show that the temperature approaches a periodic pattern (attracting limit
cycle). This approach can occur in two ways, according to the values of the
parameters: (i) a slow decay towards the limit cycle over a time longer than
the period, or (ii) a fast decay towards the limit cycle over a time shorter
than the period. In the first case, an exactly soluble average equation is
valid. We discuss the consequences of our model for the thermal stability of
satellites.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 15:37:37 GMT"
}
] | 2009-09-25T00:00:00 | [
[
"Gaite",
"Jose",
""
],
[
"Sanz-Andrés",
"Angel",
""
],
[
"Pérez-Grande",
"Isabel",
""
]
] |
0707.3400 | Koji Maruyama | Koji Maruyama, Franco Nori, Vlatko Vedral | The Physics of Maxwell's demon and information | 24 pages, 13 figures. v2: some refs added, figs improved | Rev. Mod. Phys. 81, 1 (2009). | 10.1103/RevModPhys.81.1 | null | physics.hist-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Maxwell's demon was born in 1867 and still thrives in modern physics. He
plays important roles in clarifying the connections between two theories:
thermodynamics and information. Here, we present the history of the demon and a
variety of interesting consequences of the second law of thermodynamics, mainly
in quantum mechanics, but also in the theory of gravity. We also highlight some
of the recent work that explores the role of information, illuminated by
Maxwell's demon, in the arena of quantum information theory.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 15:37:46 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Aug 2008 07:14:11 GMT"
}
] | 2009-01-13T00:00:00 | [
[
"Maruyama",
"Koji",
""
],
[
"Nori",
"Franco",
""
],
[
"Vedral",
"Vlatko",
""
]
] |
0707.3401 | Jiun-Chau Wang | Jiun-Chau Wang | Limit laws for boolean convolutions | Second version; corrected typos | null | null | null | math.OA math.PR | null | We study the distributional behavior for products, and for sums of boolean
independent random variables in an infinitesimal triangular array. We show that
the limit laws of boolean convolutions are determined by the limit laws of free
convolutions, and vice versa. We further use these results to show several
connections between the limiting distributional behavior of classical
convolutions and that of boolean convolutions. The proof of our results is
based on the analytical apparatus developed for free convolutions.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 15:48:42 GMT"
},
{
"version": "v2",
"created": "Sat, 28 Jul 2007 20:26:30 GMT"
}
] | 2007-07-30T00:00:00 | [
[
"Wang",
"Jiun-Chau",
""
]
] |
0707.3402 | Michael Chen Mr. | Hai-Tao Zhang, Michael ZhiQiang Chen, Tao Zhou | Synchronized Collective Behavior via Low-cost Communication | 4 pages, 4 figures | null | null | null | physics.data-an physics.gen-ph | null | An important natural phenomenon surfaces that satisfactory synchronization of
self-driven particles can be achieved via sharply reduced communication cost,
especially for high density particle groups with low external noise.
Statistical numerical evidence illustrates that a highly efficient manner is to
distribute the communication messages as evenly as possible along the whole
dynamic process, since it minimizes the communication redundancy. More
surprisingly, it is discovered that there exist some abnormal regions where
moderately decreasing the communication cost can even improve the
synchronization performance. A phase diagram on the noise-density parameter
space is given, where the dynamical behaviors can be divided into three
qualitatively different phases: normal phase where better synchronization
corresponds to higher communication cost, abnormal phase where moderately
decreasing communication cost could even improve the synchronization, and the
disordered phase where no coherence among individuals is observed.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 15:51:34 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Zhang",
"Hai-Tao",
""
],
[
"Chen",
"Michael ZhiQiang",
""
],
[
"Zhou",
"Tao",
""
]
] |
0707.3403 | Elmar Wagner | Elmar Wagner | On the noncommutative spin geometry of the standard Podles sphere and
index computations | 33 pages, title changed, Section 3.1 completely rewritten,
Chern-Connes pairing in the "no-dimension drop" case included | null | null | null | math.QA math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of the paper is twofold: First, known results of the
noncommutative spin geometry of the standard Podles sphere are extended by
discussing Poincare duality and orientability. In the discussion of
orientability, Hochschild homology is replaced by a twisted version which
avoids the dimension drop. The twisted Hochschild cycle representing an
orientation is related to the volume form of the distinguished covariant
differential calculus. Integration over the volume form defines a twisted
cyclic 2-cocycle which computes the q-winding numbers of quantum line bundles.
Second, a "twisted" Chern character from equivariant K0-theory to even twisted
cyclic homology is introduced which gives rise to a Chern-Connes pairing
between equivariant K0-theory and twisted cyclic cohomology. The Chern-Connes
pairing between the equivariant K0-group of the standard Podles sphere and the
generators of twisted cyclic cohomology relative to the modular automorphism
and its inverse are computed. This includes the pairings with the twisted
cyclic 2-cocycle associated to the volume form, and the one corresponding to
the "no-dimension drop" case. From explicit index computations, it follows that
the pairings with these cocycles give the q-indices of the known equivariant
0-summable Dirac operator on the standard Podles sphere.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:00:13 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Sep 2008 23:43:22 GMT"
}
] | 2008-09-05T00:00:00 | [
[
"Wagner",
"Elmar",
""
]
] |
0707.3404 | Janusz Gwozdziewicz | Janusz Gwozdziewicz | Kouchnirenko type formulas for local invariants of plane analytic curves | 7 pages | Generalized Noether's formulas for plane curves singularities,
Univ. Iagell. Acta Math. 48 (2010) 71-78 | null | null | math.AG | null | Let f(x,y)=0 be an equation of plane analytic curve defined in the
neighborhood of the origin and let $\pi:M\to(\Cn^2,0)$ be a local toric
modification. We give a formula which connects a number of double points
\delta_0(f)$ with a sum $\sum_p \delta_p(\tilde f)$ which runs over all
intersection points of the proper preimage of f=0 with the exceptional divisor.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:01:42 GMT"
}
] | 2012-08-07T00:00:00 | [
[
"Gwozdziewicz",
"Janusz",
""
]
] |
0707.3405 | Andrew Knyazev | Fran\c{c}ois Bottin, St\'ephane Leroux, Andrew Knyazev, and Gilles
Z\'erah | Large scale ab initio calculations based on three levels of
parallelization | 8 pages, 5 figures. Accepted to Computational Material Science | Computational Material Science, 42(2), 329-336, 2008 | 10.1016/j.commatsci.2007.07.019 | UCDHSC-CCM-254 | cond-mat.mtrl-sci | null | We suggest and implement a parallelization scheme based on an efficient
multiband eigenvalue solver, called the locally optimal block preconditioned
conjugate gradient LOBPCG method, and using an optimized three-dimensional (3D)
fast Fourier transform (FFT) in the ab initio}plane-wave code ABINIT. In
addition to the standard data partitioning over processors corresponding to
different k-points, we introduce data partitioning with respect to blocks of
bands as well as spatial partitioning in the Fourier space of coefficients over
the plane waves basis set used in ABINIT. This k-points-multiband-FFT
parallelization avoids any collective communications on the whole set of
processors relying instead on one-dimensional communications only. For a single
k-point, super-linear scaling is achieved for up to 100 processors due to an
extensive use of hardware optimized BLAS, LAPACK, and SCALAPACK routines,
mainly in the LOBPCG routine. We observe good performance up to 200 processors.
With 10 k-points our three-way data partitioning results in linear scaling up
to 1000 processors for a practical system used for testing.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:14:55 GMT"
}
] | 2010-06-02T00:00:00 | [
[
"Bottin",
"François",
""
],
[
"Leroux",
"Stéphane",
""
],
[
"Knyazev",
"Andrew",
""
],
[
"Zérah",
"Gilles",
""
]
] |
0707.3406 | Oscar J. C. Dias | Vitor Cardoso, Oscar J.C. Dias, Robert C. Myers | On the gravitational stability of D1-D5-P black holes | 18 pages, 3 figures. Minor comments added to match published version | Phys.Rev.D76:105015,2007 | 10.1103/PhysRevD.76.105015 | null | hep-th gr-qc | null | We examine the stability of the nonextremal D1-D5-P black hole solutions. In
particular, we look for the appearance of a superradiant instability for the
spinning black holes but we find no evidence of such an instability. We compare
this situation with that for the smooth soliton geometries, which were recently
observed to suffer from an ergoregion instability, and consider the
implications for the fuzzball proposal.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:23:52 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Oct 2007 12:34:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cardoso",
"Vitor",
""
],
[
"Dias",
"Oscar J. C.",
""
],
[
"Myers",
"Robert C.",
""
]
] |
0707.3407 | Alexander Tiskin | Alexander Tiskin | Faster subsequence recognition in compressed strings | null | null | null | null | cs.DS cs.CC cs.DM | null | Computation on compressed strings is one of the key approaches to processing
massive data sets. We consider local subsequence recognition problems on
strings compressed by straight-line programs (SLP), which is closely related to
Lempel--Ziv compression. For an SLP-compressed text of length $\bar m$, and an
uncompressed pattern of length $n$, C{\'e}gielski et al. gave an algorithm for
local subsequence recognition running in time $O(\bar mn^2 \log n)$. We improve
the running time to $O(\bar mn^{1.5})$. Our algorithm can also be used to
compute the longest common subsequence between a compressed text and an
uncompressed pattern in time $O(\bar mn^{1.5})$; the same problem with a
compressed pattern is known to be NP-hard.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:26:24 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Nov 2007 14:16:07 GMT"
},
{
"version": "v3",
"created": "Fri, 11 Jan 2008 21:54:54 GMT"
},
{
"version": "v4",
"created": "Fri, 18 Jan 2008 10:20:48 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Tiskin",
"Alexander",
""
]
] |
0707.3408 | Annalisa Cerquetti | Annalisa Cerquetti | On a Gibbs characterization of normalized generalized Gamma processes | 13 pages | Statistics & Probability Letters, 78, (2008) 3123 - 3128 | 10.1016/j.spl.2008.05.027 | null | math.PR | null | We show that a Gibbs characterization of normalized generalized Gamma
processes, recently obtained in Lijoi, Pr\"unster and Walker (2007), can
alternatively be derived by exploiting a characterization of exponentially
tilted Poisson-Kingman models stated in Pitman (2003). We also provide a
completion of this result investigating the existence of normalized random
measures inducing exchangeable Gibbs partitions of type $\alpha \in (-\infty,
0]$.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:33:06 GMT"
}
] | 2010-01-02T00:00:00 | [
[
"Cerquetti",
"Annalisa",
""
]
] |
0707.3409 | Alexander Tiskin | Alexander Tiskin | Faster exon assembly by sparse spliced alignment | null | null | null | null | cs.DS cs.CC cs.CE q-bio.QM | null | Assembling a gene from candidate exons is an important problem in
computational biology. Among the most successful approaches to this problem is
\emph{spliced alignment}, proposed by Gelfand et al., which scores different
candidate exon chains within a DNA sequence of length $m$ by comparing them to
a known related gene sequence of length n, $m = \Theta(n)$. Gelfand et al.\
gave an algorithm for spliced alignment running in time O(n^3). Kent et al.\
considered sparse spliced alignment, where the number of candidate exons is
O(n), and proposed an algorithm for this problem running in time O(n^{2.5}). We
improve on this result, by proposing an algorithm for sparse spliced alignment
running in time O(n^{2.25}). Our approach is based on a new framework of
\emph{quasi-local string comparison}.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:35:54 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Tiskin",
"Alexander",
""
]
] |
0707.3410 | Colleen Robles | J.M. Landsberg and C. Robles | Fubini-Griffiths-Harris rigidity and Lie algebra cohomology | v.1: 25 pages. v.2: The exposition has been improved and the language
of filtered EDS used | null | null | null | math.DG math.AG math.RT | null | We prove a general extrinsic rigidity theorem for homogeneous varieties in
$\mathbb{CP}^N$. The theorem is used to show that the adjoint variety of a
complex simple Lie algebra $\mathfrak{g}$ (the unique minimal G orbit in
$\mathbb{P}\mathfrak{g}$) is extrinsically rigid to third order.
In contrast, we show that the adjoint variety of $SL_3\mathbb{C}$, and the
Segre product $\mathit{Seg}(\mathbb{P}^1\times \mathbb{P}^n)$, both varieties
with osculating sequences of length two, are flexible at order two. In the
$SL_3\mathbb{C}$ example we discuss the relationship between the extrinsic
projective geometry and the intrinsic path geometry.
We extend machinery developed by Hwang and Yamaguchi, Se-ashi, Tanaka and
others to reduce the proof of the general theorem to a Lie algebra cohomology
calculation. The proofs of the flexibility statements use exterior differential
systems techniques.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:40:48 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 15:28:22 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Landsberg",
"J. M.",
""
],
[
"Robles",
"C.",
""
]
] |
0707.3411 | Alexandros G. Vanakaras | Alexandros G. Vanakaras and Demetri J. Photinos | Thermotropic Biaxial Nematics: Spontaneous or Field-Stabilized? | 2 eps Figures | J. Chem. Phys. 128, 154512 (2008) | 10.1063/1.2897993 | null | cond-mat.soft cond-mat.mtrl-sci | null | An intermediate nematic phase is proposed for the interpretation of recent
experimental results on phase biaxiality in bent-core nematics. The phase is
macroscopically uniaxial but consists of microscopic biaxial, and possibly
polar, domains. On applying an electric field the phase exhibits substantial
macroscopic biaxial ordering resulting from the collective alignment of the
domains. A phenomenological theory is developed for the molecular order in this
phase and for its transitions to purely uniaxial and to spontaneously biaxial
nematic phases.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:41:26 GMT"
}
] | 2009-04-28T00:00:00 | [
[
"Vanakaras",
"Alexandros G.",
""
],
[
"Photinos",
"Demetri J.",
""
]
] |
0707.3412 | Nicola Caon | Luz M. Cairos, Nicola Caon, Begona Garcia Lorenzo, Ana Monreal-Ibero,
Ricardo Amorin, Peter Weilbacher, Polychronis Papaderos | Spectrophotometric investigations of Blue Compact Dwarf Galaxies:
Markarian 35 | 21 pages, 13 figures. Accepted for publication in ApJ, tentatively
scheduled for the ApJ November 1, 2007 v669n1 issue | null | 10.1086/521615 | null | astro-ph | null | We present results from a detailed spectrophotometric analysis of the blue
compact dwarf galaxy Mrk 35 (Haro 3), based on deep optical (B,V,R,I) and
near-IR (J,H,K) imaging, Halpha narrow-band observations and long-slit
spectroscopy. The optical emission of the galaxy is dominated by a central
young starburst, with a bar-like shape, while an underlying component of stars,
with elliptical isophotes and red colors, extends more than 4 kpc from the
galaxy center. High resolution Halpha and color maps allow us to identify the
star-forming regions, to spatially discriminate them from the older stars, and
to recognize several dust patches. We derive colors and Halpha parameters for
all the identified star-forming knots. Observables derived for each knot are
corrected for the contribution of the underlying older stellar population, the
contribution by emission lines, and from interstellar extinction, and compared
with evolutionary synthesis models. We find that the contributions of these
three factors are by no means negligible and that they significantly vary
across the galaxy. Therefore, careful quantification and subtraction of
emission lines, galaxy host contribution, and interstellar reddening at every
galaxy position, are essential to derive the properties of the young stars in
BCDs. We find that we can reproduce the colors of all the knots with an
instantaneous burst of star formation and the Salpeter initial mass function
with an upper mass limit of 100 M_solar. In all cases the knots are just a few
Myr old. The underlying population of stars has colors consistent with being
several Gyr old.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:43:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cairos",
"Luz M.",
""
],
[
"Caon",
"Nicola",
""
],
[
"Lorenzo",
"Begona Garcia",
""
],
[
"Monreal-Ibero",
"Ana",
""
],
[
"Amorin",
"Ricardo",
""
],
[
"Weilbacher",
"Peter",
""
],
[
"Papaderos",
"Polychronis",
""
]
] |
0707.3413 | Michael A. Strauss | Jennifer K. Adelman-McCarthy, et al. (for the SDSS Collaboration) | The Sixth Data Release of the Sloan Digital Sky Survey | 21 pages with 8 color figures. ApJS, in press. Minor modifications
from previous version | Astrophys.J.Suppl.175:297-313,2008 | 10.1086/524984 | null | astro-ph | null | With the Sixth Data Release of the Sloan Digital Sky Survey, the imaging of
the Northern Galactic Cap is now complete. The survey contains images and
parameters of roughly 287 million objects over 9583 deg^2, and 1.27 million
spectra of stars, galaxies, quasars and blank sky (for sky subtraction)
selected over 7425 deg^2. This release includes much more extensive stellar
spectroscopy than previously, and also includes detailed estimates of stellar
temperatures, gravities, and metallicities. The results of improved photometric
calibration are now available, with uncertainties of roughly 1% in g, r, i, and
z, and 2% in u, substantially better than the uncertainties in previous data
releases. The spectra in this data release have improved wavelength and flux
calibration, especially in the extreme blue and extreme red, leading to the
qualitatively better determination of stellar types and radial velocities. The
spectrophotometric fluxes are now tied to point spread function magnitudes of
stars rather than fiber magnitudes, giving a 0.35 mag change in the
spectrophotometric flux scale. Systematic errors in the velocity dispersions of
galaxies have been fixed, and the results of two independent codes for
determining spectral classifications and redshifts are made available.
(Abridged)
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 19:16:14 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 13:44:20 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Adelman-McCarthy",
"Jennifer K.",
""
]
] |
0707.3414 | D. P. Roy | D. P. Roy | Probing the Two Greatest Mysteries of the Universe | 6 pages, 2 figures, Foreward to the Proc of the Workshop on
Neutrinoless Double Beta Decay, Ahmedabad, India, Narosa Publishing House
(2007) | null | null | null | hep-ph | null | The neutrinoless double beta decay and the direct dark matter detection
experiments probe the origins of the two greatest mysteries of the universe,
i.e. the baryon asymmetry and the invisible or dark matter. The underlying
theoretical ideas are briefly discussed along with the experimental prospects.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:55:21 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Roy",
"D. P.",
""
]
] |
0707.3415 | Jorge Iglesias | J. Iglesias-Paramo, V. Buat, J. Hernandez-Fernandez, C.K. Xu, D.
Burgarella, T.T. Takeuchi, A. Boselli, D. Shupe, M. Rowan-Robinson, T.
Babbedge, T. Conrow, F. Fang, D. Farrah, E. Gonzalez-Solares, C. Lonsdale, G.
Smith, J. Surace, T.A. Barlow, K. Forster, P.G. Friedman, D.C. Martin, P.
Morrissey, S.G. Neff, D. Schiminovich, M. Seibert, T. Small, T.K. Wyder, L.
Bianchi, J. Donas, T.M. Heckman, Y.-W. Lee, B.F. Madore, B. Milliard, R.M.
Rich, A.S. Szalay, B.Y. Welsh and S.K. Yi | UV to IR SEDs of UV selected galaxies in the ELAIS fields: evolution of
dust attenuation and star formation activity from z=0.7 to z=0.2 | 21 figures, accepted for publication in ApJ | null | 10.1086/521867 | null | astro-ph | null | We study the ultraviolet to far-infrared (hereafter UV-to-IR) SEDs of a
sample of intermediate redshift (0.2 < z < 0.7) UV-selected galaxies from the
ELAIS-N1 and ELAIS-N2 fields by fitting a multi-wavelength dataset to a library
of GRASIL templates. Star formation related properties of the galaxies are
derived from the library of models by using the Bayesian statistics. We find a
decreasing presence of galaxies with low attenuation and low total luminosity
as redshift decreases, which does not hold for high total luminosity galaxies.
In addition the dust attenuation of low mass galaxies increases as redshift
decreases, and this trend seems to disappear for galaxies with M* > 10^11
M_sun. This result is consistent with a mass dependent evolution of the dust to
gas ratio, which could be driven by a mass dependent efficiency of star
formation in star forming galaxies. The specific star formation rates (SSFR)
decrease with increasing stellar mass at all redshifts, and for a given stellar
mass the SSFR decreases with decreasing redshift. The differences in the slope
of the M*--SSFR relation found between this work and others at similar redshift
could be explained by the adopted selection criteria of the samples which, for
a UV selected sample, favours blue, star forming galaxies.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 16:55:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iglesias-Paramo",
"J.",
""
],
[
"Buat",
"V.",
""
],
[
"Hernandez-Fernandez",
"J.",
""
],
[
"Xu",
"C. K.",
""
],
[
"Burgarella",
"D.",
""
],
[
"Takeuchi",
"T. T.",
""
],
[
"Boselli",
"A.",
""
],
[
"Shupe",
"D.",
""
],
[
"Rowan-Robinson",
"M.",
""
],
[
"Babbedge",
"T.",
""
],
[
"Conrow",
"T.",
""
],
[
"Fang",
"F.",
""
],
[
"Farrah",
"D.",
""
],
[
"Gonzalez-Solares",
"E.",
""
],
[
"Lonsdale",
"C.",
""
],
[
"Smith",
"G.",
""
],
[
"Surace",
"J.",
""
],
[
"Barlow",
"T. A.",
""
],
[
"Forster",
"K.",
""
],
[
"Friedman",
"P. G.",
""
],
[
"Martin",
"D. C.",
""
],
[
"Morrissey",
"P.",
""
],
[
"Neff",
"S. G.",
""
],
[
"Schiminovich",
"D.",
""
],
[
"Seibert",
"M.",
""
],
[
"Small",
"T.",
""
],
[
"Wyder",
"T. K.",
""
],
[
"Bianchi",
"L.",
""
],
[
"Donas",
"J.",
""
],
[
"Heckman",
"T. M.",
""
],
[
"Lee",
"Y. -W.",
""
],
[
"Madore",
"B. F.",
""
],
[
"Milliard",
"B.",
""
],
[
"Rich",
"R. M.",
""
],
[
"Szalay",
"A. S.",
""
],
[
"Welsh",
"B. Y.",
""
],
[
"Yi",
"S. K.",
""
]
] |
0707.3416 | Alexandru Raduta Dr. | A. H. Raduta, M. Colonna, M. Di Toro | Searching for statistical equilibrium in a dynamical multifragmentation
path | 7 pages, 10 figures, accepted for publication in Physical Review C | Phys.Rev.C76:024602,2007 | 10.1103/PhysRevC.76.024602 | null | nucl-th | null | A method for identifying statistical equilibrium stages in dynamical
multifragmentation paths as provided by transport models, already successfully
tested for for the reaction ^{129}Xe+^{119}Sn at 32 MeV/u is applied here to a
higher energy reaction, ^{129}Xe+^{119}Sn at 50 MeV/u. The method evaluates
equilibrium from the point of view of the microcanonical multifragmentation
model (MMM) and reactions are simulated by means of the stochastic mean field
model (SMF). A unique solution, corresponding to the maximum population of the
system phase space, was identified suggesting that a huge part of the available
phase space is occupied even in the case of the 50 MeV/u reaction, in presence
of a considerable amount of radial collective flow. The specific equilibration
time and volume are identified and differences between the two systems are
discussed.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:25:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Raduta",
"A. H.",
""
],
[
"Colonna",
"M.",
""
],
[
"Di Toro",
"M.",
""
]
] |
0707.3417 | Steven Miller | Peter Hegarty, Steven J. Miller | When almost all sets are difference dominated | Version 2.1. 24 pages. Fixed a few typos, updated references | Random Structures and Algorithms 35 (2009), no. 1, 118--136 | null | null | math.NT math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the relationship between the sizes of the sum and difference
sets attached to a subset of {0,1,...,N}, chosen randomly according to a
binomial model with parameter p(N), with N^{-1} = o(p(N)). We show that the
random subset is almost surely difference dominated, as N --> oo, for any
choice of p(N) tending to zero, thus confirming a conjecture of Martin and
O'Bryant. The proofs use recent strong concentration results.
Furthermore, we exhibit a threshold phenomenon regarding the ratio of the
size of the difference- to the sumset. If p(N) = o(N^{-1/2}) then almost all
sums and differences in the random subset are almost surely distinct, and in
particular the difference set is almost surely about twice as large as the
sumset. If N^{-1/2} = o(p(N)) then both the sum and difference sets almost
surely have size (2N+1) - O(p(N)^{-2}), and so the ratio in question is almost
surely very close to one. If p(N) = c N^{-1/2} then as c increases from zero to
infinity (i.e., as the threshold is crossed), the same ratio almost surely
decreases continuously from two to one according to an explicitly given
function of c.
We also extend our results to the comparison of the generalized difference
sets attached to an arbitrary pair of binary linear forms. For certain pairs of
forms f and g, we show that there in fact exists a sharp threshold at c_{f,g}
N^{-1/2}, for some computable constant c_{f,g}, such that one form almost
surely dominates below the threshold, and the other almost surely above it.
The heart of our approach involves using different tools to obtain strong
concentration of the sizes of the sum and difference sets about their mean
values, for various ranges of the parameter p.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:27:32 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 13:25:55 GMT"
},
{
"version": "v3",
"created": "Tue, 7 Aug 2007 16:09:11 GMT"
},
{
"version": "v4",
"created": "Tue, 11 Sep 2007 19:02:12 GMT"
},
{
"version": "v5",
"created": "Thu, 9 Oct 2008 19:56:39 GMT"
}
] | 2010-09-15T00:00:00 | [
[
"Hegarty",
"Peter",
""
],
[
"Miller",
"Steven J.",
""
]
] |
0707.3418 | Joe Helmboldt | J. F. Helmboldt, N. E. Kassim, A. S. Cohen, W. M. Lane, T. J. Lazio | Radio Frequency Spectra of 388 Bright 74 MHz Sources | Accepted to ApJS | null | 10.1086/521829 | null | astro-ph | null | As a service to the community, we have compiled radio frequency spectra from
the literature for all sources within the VLA Low Frequency Sky Survey (VLSS)
that are brighter than 15 Jy at 74 MHz. Over 160 references were used to
maximize the amount of spectral data used in the compilation of the spectra,
while also taking care to determine the corrections needed to put the flux
densities from all reference on the same absolute flux density scale. With the
new VLSS data, we are able to vastly improve upon previous efforts to compile
spectra of bright radio sources to frequencies below 100 MHz because (1) the
VLSS flux densities are more reliable than those from some previous low
frequency surveys and (2) the VLSS covers a much larger area of the sky
(declination >-30 deg.) than many other low frequency surveys (e.g., the 8C
survey). In this paper, we discuss how the spectra were constructed and how
parameters quantifying the shapes of the spectra were derived. Both the spectra
and the shape parameters are made available here to assist in the calibration
of observations made with current and future low frequency radio facilities.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:42:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Helmboldt",
"J. F.",
""
],
[
"Kassim",
"N. E.",
""
],
[
"Cohen",
"A. S.",
""
],
[
"Lane",
"W. M.",
""
],
[
"Lazio",
"T. J.",
""
]
] |
0707.3419 | Oleg Lebedev | John Ellis and Oleg Lebedev | The Seesaw with Many Right-Handed Neutrinos | 14 pages; refs. added, published version | Phys.Lett.B653:411-418,2007 | 10.1016/j.physletb.2007.08.031 | CERN-PH-TH/2007-125 | hep-ph | null | There are no upper limits on the possible number of massive, singlet
(right--handed) neutrinos that may participate in the seesaw mechanism, and
some string constructions motivate seesaw models with up to O(100)
right--handed neutrinos. In this case, the seesaw mass scale can be
significantly higher than that in the traditional scheme with just 3
right--handed neutrinos. We consider the possible phenomenological implications
of such models, in particular, for lepton-flavour violation and electric dipole
moments. Since the neutrino masses depend on the Majorana mass scale linearly,
while supersymmetric loop corrections depend on it logarithmically, the
magnitude of lepton-flavour- and CP-violating transitions may increase with the
multiplicity of the right--handed neutrinos and may be enhanced by orders of
magnitude. We also point out that, in the context of leptogensis, the bounds on
the reheating temperature and the lightest neutrino mass get relaxed compared
to those in the case of 3 right--handed neutrinos.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:43:52 GMT"
},
{
"version": "v2",
"created": "Wed, 15 Aug 2007 11:47:05 GMT"
},
{
"version": "v3",
"created": "Wed, 22 Aug 2007 15:17:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ellis",
"John",
""
],
[
"Lebedev",
"Oleg",
""
]
] |
0707.3420 | Andrey Leznov | A. N. Leznov | Free motion in deformed (quantum) four-dimensional space | 7 pages, no figures | null | null | null | hep-th | null | It is shown that trajectories of free motion of the particles in deformed
("quantum") four dimensional space-time are quadratic curves.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:44:19 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Leznov",
"A. N.",
""
]
] |
0707.3421 | Jerrold Franklin | Jerrold Franklin | The nature of electromagnetic energy | The discussion and conclusions have been modified. Some references
have been added | null | null | null | physics.gen-ph | http://creativecommons.org/licenses/by/4.0/ | The nature of electromagnetic energy for general charge and current
distributions is analyzed. We compare several forms for the electromagnetic
energy, and discuss under what conditions there will be electromagnetic energy
within a specific volume. Our conclusion is that electromagnetic energy resides
in charge and current densities, and there is no electromagnetic energy in any
volume that does not contain electric charge or current.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:48:36 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Sep 2007 18:21:40 GMT"
},
{
"version": "v3",
"created": "Sun, 28 Sep 2008 15:12:03 GMT"
},
{
"version": "v4",
"created": "Tue, 29 May 2012 21:07:50 GMT"
},
{
"version": "v5",
"created": "Fri, 30 Sep 2022 19:15:41 GMT"
},
{
"version": "v6",
"created": "Mon, 28 Aug 2023 17:01:09 GMT"
}
] | 2023-08-29T00:00:00 | [
[
"Franklin",
"Jerrold",
""
]
] |
0707.3422 | Nikolaos Mavromatos | Nikolaos E. Mavromatos (King's College London) | CPT and Decoherence in Quantum Gravity | 11 pages LATEX, six eps figures incorporated. Invited Plenary talk at
the Kaon 2007 International Conference, LN Frascati (Italy), 21-25 May 2007.
Submitted to Proc. of Science | PoSKAON:041,2008 | null | null | hep-ph gr-qc hep-th | null | In this review, I first discuss briefly some theoretical motivations for
potential Lorentz Violation and deviation from ordinary quantum mechanical
behavior (decoherence) of field theoretic systems in the background of some
quantum gravity (QG) models. Both types of effects lead to CPT violation, but
they can be disentangled experimentally. I, then, proceed to a description of
precision tests of CPT symmetry using neutral and charged Kaons, which are of
direct relevance to the main theme of this conference. I emphasize the
potentially unique r\^ole of neutral meson factories in providing
``smoking-gun'' evidence of some QG-decoherence models in which the CPT quantum
mechanical operator is not well defined. This is achieved by means of potential
observations of QG-induced modifications of the pertinent
Einstein-Podolsky-Rosen (EPR) particle correlations.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 17:54:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mavromatos",
"Nikolaos E.",
"",
"King's College London"
]
] |
0707.3423 | Michael T. Jury | Michael T. Jury | An improved Julia-Caratheodory theorem for Schur-Agler mappings of the
unit ball | 10 pages | null | null | null | math.CV math.FA | null | We adapt Sarason's proof of the Julia-Caratheodory theorem to the class of
Schur-Agler mappings of the unit ball, obtaining a strengthened form of this
theorem. In particular those quantities which appear in the classical theorem
and depend only on the component of the mapping in the complex normal direction
have K-limits (not just restricted K-limits) at the boundary.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 18:40:24 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Jury",
"Michael T.",
""
]
] |
0707.3424 | Bennie F. L. Ward | B.F.L. Ward (1)((1) Department of Physics, Baylor University, Waco,
TX, USA) | IR-Improved DGLAP Theory: Kernels, Parton Distributions, Reduced Cross
Sections | 27 pages, 2 figures | Annals Phys.323:2147-2171,2008 | 10.1016/j.aop.2007.11.010 | BU-HEPP-07-08; improved text | hep-ph | null | It is shown that exact, amplitude-based resummation allows IR-improvement of
the usual DGLAP theory. This results in a new set of kernels, parton
distributions and attendant reduced cross sections, so that the QCD
perturbative result for the respective hadron-hadron or lepton-hadron cross
section is unchanged order-by-order in $\alpha_s$ at large squared-momentum
transfers. We compare these new objects with their usual counter-parts and
illustrate the effects of the IR-improvement in some phenomenological cases of
interest with an eye toward precision applications in LHC physics scenarios.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 18:26:23 GMT"
},
{
"version": "v2",
"created": "Sat, 27 Oct 2007 16:29:04 GMT"
}
] | 2010-03-25T00:00:00 | [
[
"Ward",
"B. F. L.",
""
]
] |
0707.3425 | Michael T. Jury | Michael T. Jury | Norms and spectral radii of linear fractional composition operators on
the ball | 15 pages | null | null | null | math.FA | null | We give a new proof that every linear fractional map of the unit ball induces
a bounded composition operator on the standard scale of Hilbert function spaces
on the ball, and obtain norm bounds analogous to the standard one-variable
estimates. We also show that Cowen's one-variable spectral radius formula
extends to these operators. The key observation underlying these results is
that every linear fractional map of the ball belongs to the Schur-Agler class.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 18:38:47 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Jury",
"Michael T.",
""
]
] |
0707.3426 | Michael T. Jury | Michael T. Jury | Reproducing kernels, de Branges-Rovnyak spaces, and norms of weighted
composition operators | 9 pages, to appear in Proc. Amer. Math Soc | null | null | null | math.FA | null | We prove that the norm of a weighted composition operator on the Hardy space
H^2 of the disk is controlled by the norm of the weight function in the de
Branges-Rovnyak space associated to the symbol of the composition operator. As
a corollary we obtain a new proof of the boundedness of composition operators
on H^2, and recover the standard upper bound for the norm. Similar arguments
apply to weighted Bergman spaces. We also show that the positivity of a
generalized de Branges-Rovnyak kernel is sufficient for the boundedness of a
given composition operator on the standard functions spaces on the unit ball.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 18:42:17 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Jury",
"Michael T.",
""
]
] |
0707.3427 | Nathan Williams | Nathan S. Williams and Andrew N. Jordan | Weak values and the Leggett-Garg inequality in solid-state qubits | 4 pages, 2 figures | Phys. Rev. Lett. 100, 026804 (2008) | 10.1103/PhysRevLett.100.026804 | null | cond-mat.mes-hall quant-ph | null | An implementation of weak values is investigated in solid-state qubits. We
demonstrate that a weak value can be non-classical if and only if a
Leggett-Garg inequality can also be violated. Generalized weak values are
described, where post-selection on a range of weak measurement results.
Imposing classical weak values permits the derivation of Leggett-Garg
inequalities for bounded operators. Our analysis is presented in terms of
kicked quantum nondemolition measurements on a quantum double-dot charge qubit.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 18:29:47 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Williams",
"Nathan S.",
""
],
[
"Jordan",
"Andrew N.",
""
]
] |
0707.3428 | Tobias Galla | Luca De Sanctis, Tobias Galla | Effects of noise and confidence thresholds in nominal and metric Axelrod
dynamics of social influence | 15 pages, 12 figures | null | 10.1103/PhysRevE.79.046108 | null | physics.soc-ph cond-mat.stat-mech | null | We study the effects of bounded confidence thresholds and of interaction and
external noise on Axelrod's model of social influence. Our study is based on a
combination of numerical simulations and an integration of the mean-field
Master equation describing the system in the thermodynamic limit. We find that
interaction thresholds affect the system only quantitatively, but that they do
not alter the basic phase structure. The known crossover between an ordered and
a disordered state in finite systems subject to external noise persists in
models with general confidence threshold. Interaction noise here facilitates
the dynamics and reduces relaxation times. We also study Axelrod systems with
metric features, and point out similarities and differences compared to models
with nominal features. Metric features are used to demonstrate that a small
group of extremists can have a significant impact on the opinion dynamics of a
population of Axelrod agents.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 18:41:48 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"De Sanctis",
"Luca",
""
],
[
"Galla",
"Tobias",
""
]
] |
0707.3429 | Zhaohuan Zhu | Zhaohuan Zhu (1), Lee Hartmann (1), Nuria Calvet (1), Jesus Hernandez
(1 and 3), James Muzerolle (2), Ajay-Kumar Tannirkulam (1) ((1) Dept. of
Astronomy, University of Michigan, (2) Steward Observatory, University of
Arizona, (3) Centro de Investigaciones de Astronomia, Merida, Venezuela) | The Hot Inner Disk of FU Ori | 32 pages, 10 figures, to appear in the Astrophysical Journal | null | 10.1086/521345 | null | astro-ph | null | We have constructed a detailed radiative transfer disk model which reproduces
the main features of the spectrum of the outbursting young stellar object FU
Orionis from ~ 4000 angstrom, to ~ 8 micron. Using an estimated visual
extinction Av~1.5, a steady disk model with a central star mass ~0.3 Msun and a
mass accretion rate ~ 2e-4 Msun/yr, we can reproduce the spectral energy
distribution of FU Ori quite well. With the mid-infrared spectrum obtained by
the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope, we
estimate that the outer radius of the hot, rapidly accreting inner disk is ~ 1
AU using disk models truncated at this outer radius. Inclusion of radiation
from a cooler irradiated outer disk might reduce the outer limit of the hot
inner disk to ~ 0.5 AU. In either case, the radius is inconsistent with a pure
thermal instability model for the outburst. Our radiative transfer model
implies that the central disk temperature Tc > 1000 K out to ~ 0.5 - 1 AU,
suggesting that the magnetorotational instability (MRI) can be supported out to
that distance. Assuming that the ~ 100 yr decay timescale in brightness of FU
Ori represents the viscous timescale of the hot inner disk, we estimate the
viscosity parameter (alpha) to be ~ 0.2 - 0.02 in the outburst state,
consistent with numerical simulations of MRI in disks. The radial extent of the
high mass accretion region is inconsistent with the model of Bell & Lin, but
may be consistent with theories incorporating both gravitational instability
and MRI.
| [
{
"version": "v1",
"created": "Mon, 23 Jul 2007 19:21:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhu",
"Zhaohuan",
"",
"1 and 3"
],
[
"Hartmann",
"Lee",
"",
"1 and 3"
],
[
"Calvet",
"Nuria",
"",
"1 and 3"
],
[
"Hernandez",
"Jesus",
"",
"1 and 3"
],
[
"Muzerolle",
"James",
""
],
[
"Tannirkulam",
"Ajay-Kumar",
""
]
] |
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