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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.4214 | Yi Song | Yi Song and Stephen P. Banks (ACSE, University of Sheffield) | Dynamical Systems On Three Manifolds Part II: 3-Manifolds,Heegaard
Splittings and Three-Dimensional Systems | 15 pages with 9 pictures. Accepted by Int. J. of Bifurcation and
Chaos | null | 10.1142/S0218127407018233 | null | math.DS | null | The global behaviour of nonlinear systems is extremely important in control
and systems theory since the usual local theories will only give information
about a system in some neighbourhood of an operating point. Away from that
point, the system may have totally different behaviour and so the theory
developed for the local system will be useless for the global one.
In this paper we shall consider the analytical and topological structure of
systems on 2- and 3- manifolds and show that it is possible to obtain systems
with 'arbitrarily strange' behaviour, i.e., arbitrary numbers of chaotic
regimes which are knotted and linked in arbitrary ways. We shall do this by
considering Heegaard Splittings of these manifolds and the resulting systems
defined on the boundaries.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:46:20 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Song",
"Yi",
"",
"ACSE, University of Sheffield"
],
[
"Banks",
"Stephen P.",
"",
"ACSE, University of Sheffield"
]
] |
0706.4215 | Marco Ruggieri | M. Ciminale, G. Nardulli, M. Ruggieri and R. Gatto | Polyakov loop and the color-flavor locked phase of Quantum
Chromodynamics | 7 pages, 2 figures, RevTeX4 style | Phys.Lett.B657:64-68,2007 | 10.1016/j.physletb.2007.10.012 | BA-TH 570/07 | hep-ph | null | We consider the Polyakov Nambu Jona Lasinio model with three massless quarks
at high density and moderate temperature in the superconductive color flavor
locking phase. We compute the critical temperature $T_c$ as a function of the
baryonic chemical potential for the phase transition from the superconductive
state to the normal phase. We find that $T_c$ is higher by a factor 1.5 -2 in
comparison to the model containing no Polyakov loop. We also compute the
specific heat $C_v$ near the second order phase transition and we show that the
inclusion of the Polyakov loop does not change the value of the critical
exponent.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:07:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ciminale",
"M.",
""
],
[
"Nardulli",
"G.",
""
],
[
"Ruggieri",
"M.",
""
],
[
"Gatto",
"R.",
""
]
] |
0706.4216 | Jean-Luc Garden | Jean-Luc Garden (NEEL), Jacques Richard (NEEL) | Entropy production in ac-calorimetry | null | null | null | null | cond-mat.other | null | In calorimetry and particularly in heat capacity measurements, different
characteristic relaxation time constants may perturb the experiment which
cannot be considered at thermodynamic equilibrium. In this case, thermodynamics
of irreversible processes has to be taken into account and the calorimetric
measurements must be considered as dynamic. In a temperature modulated
experiment, such as ac-calorimetry, these non-equilibrium experiments give rise
to the notion of frequency dependent complex heat capacity. In this paper, it
is shown that for each irreversible process an experimental frequency dependent
complex heat capacity can be inferred. Furthermore, we demonstrate rigorously
that a same equality connects the imaginary part of these different complex
heat capacities with the entropy produced during these irreversible processes.
Finally, we claim that the presence of an imaginary part in the measured heat
capacity always indicates that a certain amount of heat does not participate to
the classical equilibrium heat capacity of the sample when measured over the
observation time scale.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:50:37 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Garden",
"Jean-Luc",
"",
"NEEL"
],
[
"Richard",
"Jacques",
"",
"NEEL"
]
] |
0706.4217 | Jan M. L. Martin | Amir Karton and Jan M. L. Martin | W4 thermochemistry of P_2 and P_4. Is the CODATA heat of formation of
phosphorus atom correct? | Mol. Phys., in press (Peter Pulay issue) | Molecular Physics 105, 2499 (2007) | 10.1080/00268970701543572 | null | physics.chem-ph physics.atm-clus physics.comp-ph | null | The high-accuracy W4 computational thermochemistry protocol, and several
post-W4 methods, have been applied to the P$_2$ and P$_4$ molecules. Contrary
to previous studies, we find the experimental thermochemistry to be
fundamentally sound. The reaction enthalpy for P$_4\to 2$P$_2$ has a very
significant contribution from post-CCSD(T) correlation effects. We derive a
gas-phase heat of formation for the phosphorus atom of $\Delta
H^\circ_{f,0}$[P(g)]=75.54$\pm$0.1 kcal/mol and $\Delta
H^\circ_{f,298}$[P(g)]=75.74$\pm$0.1 kcal/mol, in the upper half of the CODATA
uncertainty interval.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:54:11 GMT"
}
] | 2010-08-26T00:00:00 | [
[
"Karton",
"Amir",
""
],
[
"Martin",
"Jan M. L.",
""
]
] |
0706.4218 | Jesper Fevre Bertelsen | Jesper Fevre Bertelsen and Klaus Molmer | Association of heteronuclear molecules in a harmonic oscillator well | 10 pages, 4 figures | null | null | null | cond-mat.other quant-ph | null | We describe the collisional interaction between two different atoms that are
trapped in a harmonic potential. The atoms are exposed to a magnetic field,
which is modulated in the vicinity of an s-wave Feshbach resonance, and we
study the formation of molecular bound states and excited states of the trapped
system with non-trivial angular correlations.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:55:05 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Bertelsen",
"Jesper Fevre",
""
],
[
"Molmer",
"Klaus",
""
]
] |
0706.4219 | Brigitte Gaillard | Audrey Bergouignan (DEPE-IPHC), Dale A Schoeller, Sylvie Normand,
Guillemette Gauquelin-Koch, Martine Laville, Timothy Shriver, Michel Desage,
Yvon Le Maho (DEPE-IPHC), Hiroshi Ohshima, Claude Gharib, St\'ephane Blanc
(DEPE-IPHC) | Effect of physical inactivity on the oxidation of saturated and
monounsaturated dietary Fatty acids: results of a randomized trial | null | PLoS Clin Trials 1, 5 (2006) e27 | 10.1371/journal.pctr.0010027 | null | q-bio.PE | null | OBJECTIVES: Changes in the way dietary fat is metabolized can be considered
causative in obesity. The role of sedentary behavior in this defect has not
been determined. We hypothesized that physical inactivity partitions dietary
fats toward storage and that a resistance exercise training program mitigates
storage.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 12:56:08 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Bergouignan",
"Audrey",
"",
"DEPE-IPHC"
],
[
"Schoeller",
"Dale A",
"",
"DEPE-IPHC"
],
[
"Normand",
"Sylvie",
"",
"DEPE-IPHC"
],
[
"Gauquelin-Koch",
"Guillemette",
"",
"DEPE-IPHC"
],
[
"Laville",
"Martine",
"",
"DEPE-IPHC"
],
[
"Shriver",
"Timothy",
"",
"DEPE-IPHC"
],
[
"Desage",
"Michel",
"",
"DEPE-IPHC"
],
[
"Maho",
"Yvon Le",
"",
"DEPE-IPHC"
],
[
"Ohshima",
"Hiroshi",
"",
"DEPE-IPHC"
],
[
"Gharib",
"Claude",
"",
"DEPE-IPHC"
],
[
"Blanc",
"Stéphane",
"",
"DEPE-IPHC"
]
] |
0706.4220 | Rostyslav Vlokh O | Yu. Vasylkiv, M. Polomska, Yu. Nastishin and R. Vlokh | Temperature micro-Raman study of lysozyme crystals | 8 pages, 6 figures | Ukr. J. Phys. Opt. 2007 8 158-165 | 10.3116/16091833/8/3/158/2007 | null | cond-mat.soft cond-mat.mtrl-sci | null | We have performed for the first time micro-Raman studies of lysozyme crystals
for the temperatures lower than the room one (in the range 282-300K). Anomalous
temperature dependence of the positions of Raman scattering bands has been
detected and discussed, which corresponds to the crystalline lysozyme structure
in the vicinity of T=285K.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:12:05 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Vasylkiv",
"Yu.",
""
],
[
"Polomska",
"M.",
""
],
[
"Nastishin",
"Yu.",
""
],
[
"Vlokh",
"R.",
""
]
] |
0706.4221 | Madhurjya Bora | Madhurjya P. Bora and Manasi Buzar Baruah | Thermal instability of an expanding dusty plasma with equilibrium
cooling | 23 pages, 14 figures | null | 10.1063/1.2907374 | null | physics.plasm-ph | null | We present an analysis of radiation induced instabilities in an expanding
plasma with considerable presence of dust particles and equilibrium cooling. We
have shown that the equilibrium expansion and cooling destabilize the radiation
condensation modes and the presence of dust particles enhances this effect. We
have examined our results in the context of ionized, dusty-plasma environments
such as those found in planetary nebulae (PNe). We show that due to the
non-static equilibrium and finite equilibrium cooling, small-scale localized
structures formed out of thermal instability, become transient, which agrees
with the observational results. The dust-charge fluctuation is found to heavily
suppress these instabilities, though in view of non-availability of convincing
experimental data, a definitive conclusion could not be made.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:14:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bora",
"Madhurjya P.",
""
],
[
"Baruah",
"Manasi Buzar",
""
]
] |
0706.4222 | Nikolaos Stefanis | A. P. Bakulev, N. G. Stefanis, O. V. Teryaev | Polarized and unpolarized $\mu$-pair meson-induced Drell--Yan production
and the pion distribution amplitude | V1: 18 pages, 10 figures (48 eps files), 2 tables. V2: one wrong
reference removed, missing reference in text inserted; matches version to
appear in Phys. Rev. D | Phys.Rev.D76:074032,2007 | 10.1103/PhysRevD.76.074032 | RUB-TPII-02/07 | hep-ph | null | We present a detailed analysis of meson-induced massive lepton (muon)
Drell--Yan production for the process $\pi^{-}N\to\mu^{+}\mu^{-}X$, considering
both an unpolarized nucleon target and longitudinally polarized protons. Using
a QCD framework, we focus on the angular distribution of $\mu^+$, which is
sensitive to the shape of the pion distribution amplitude, the goal being to
test corresponding results against available experimental data. Predictions are
made, employing various pion distribution amplitudes, for the azimuthal angle
dependence of the $\mu^{+}$ distribution in the polarized case, relevant for
the planned COMPASS experiment. QCD evolution is given particular attention in
both considered cases.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 07:32:28 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Sep 2007 19:32:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bakulev",
"A. P.",
""
],
[
"Stefanis",
"N. G.",
""
],
[
"Teryaev",
"O. V.",
""
]
] |
0706.4223 | Martin Haynes | T. D. Arber, M. Haynes and J. E. Leake | Emergence of a flux tube through a partially ionised solar atmosphere | Accepted for publication in ApJ | Astrophys.J.666:541-546,2007 | 10.1086/520046 | null | astro-ph | null | For a magnetic flux tube, or indeed any flux, to emerge into the Solar corona
from the convection zone it must pass through the partially ionised layers of
the lower atmosphere: the photosphere and the chromosphere. In such regions the
ion-neutral collisions lead to an increased resistivity for currents flowing
across magnetic field lines. This Cowling resistivity can exceed the Spitzer
resistivity by orders of magnitude and in 2.5D simulations has been shown to be
sufficient to remove all cross field current from emerging flux. Here we extend
this modelling into 3D. Once again it is found that the Cowling resistivity
removes perpendicular current. However the presence of 3D structure prevents
the simple comparison possible in 2.5D simulations. With a fully ionised
atmosphere the flux emergence leads to an unphysically low temperature region
in the overlying corona, lifting of chromospheric material and the subsequent
onset of the Rayleigh-Taylor instability. Including neutrals removes the low
temperature region, lifts less chromospheric matter and shows no signs of the
Rayleigh-Taylor instability. Simulations of flux emergence therefore should
include such a neutral layer in order to obtain the correct perpendicular
current, remove the Rayleigh-Taylor instability and get the correct temperature
profile. In situations when the temperature is not important, i.e. when no
simulated spectral emission is required, a simple model for the neutral layer
is demonstrated to adequately reproduce the results of fully consistent
simulations.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:17:44 GMT"
}
] | 2011-02-11T00:00:00 | [
[
"Arber",
"T. D.",
""
],
[
"Haynes",
"M.",
""
],
[
"Leake",
"J. E.",
""
]
] |
0706.4224 | Sergey Andreyev | Sergey Andreyev | User driven applications - new design paradigm | null | null | null | null | cs.GR cs.HC | null | Programs for complicated engineering and scientific tasks always have to deal
with a problem of showing numerous graphical results. The limits of the screen
space and often opposite requirements from different users are the cause of the
infinite discussions between designers and users, but the source of this
ongoing conflict is not in the level of interface design, but in the basic
principle of current graphical output: user may change some views and details,
but in general the output view is absolutely defined and fixed by the
developer. Author was working for several years on the algorithm that will
allow eliminating this problem thus allowing stepping from designer-driven
applications to user-driven. Such type of applications in which user is
deciding what, when and how to show on the screen, is the dream of scientists
and engineers working on the analysis of the most complicated tasks. The new
paradigm is based on movable and resizable graphics, and such type of graphics
can be widely used not only for scientific and engineering applications.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:19:04 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Andreyev",
"Sergey",
""
]
] |
0706.4225 | Carlos Cabrera | Carlos Cabrera and Tomoki Kawahira | Topology of the regular part for infinitely renormalizable quadratic
polynomials | null | null | null | null | math.DS math.GT | null | In this paper we describe the well studied process of renormalization of
quadratic polynomials from the point of view of their natural extensions. In
particular, we describe the topology of the inverse limit of infinitely
renormalizable quadratic polynomials and prove that when they satisfy a-priori
bounds, the topology is rigid modulo its combinatorics.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:23:43 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Cabrera",
"Carlos",
""
],
[
"Kawahira",
"Tomoki",
""
]
] |
0706.4226 | Stefan Maubach | Stefan Maubach | On the methods to construct UFD counterexamples to a cancellation
problem | 8 pages, proceedings of the Hanoi conference on polynomial
automorphisms (Acta Math. Viet.) | null | null | null | math.AG math.AC | null | In a previous paper, the author together with prof. dr. Finston constructed a
class of UFDs A_{n,m} where n,m\in \N^*. These rings are all stably equivalent
(A_{n,m}[T]\cong A_{p,q}[T] for all n,m,p,q) but are only isomorphic themselves
if (n,m)=(p,q). These examples are the first UFD examples over a
characteristically closed field satisfying this behavior. In this paper, we
describe the methods used in this article, and show that they are very general,
enabling the reader to construct many more such examples, based on the same
principles.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:28:33 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Maubach",
"Stefan",
""
]
] |
0706.4227 | Gianluca Cavoto | G.Cavoto, R.Fleischer, K.Trabelsi, J.Zupan | Angles from B Decays with Charm: Summary of Working Group 5 of the CKM
Workshop 2006 | 9 pages, 8 postscript figures, to appear in the proceedings of 4th
International Workshop on the CKM Unitarity Triangle (CKM 2006), Nagoya,
Japan, 12-16 Dec 2006 | null | null | null | hep-ph hep-ex | null | We summarize the results presented in Working Group 5 (WG5) of the CKM 2006
Workshop in Nagoya. The charge of WG5 was to discuss the measurements of
unitarity triangle angles $\beta/\phi_1$ and $\gamma/\phi_3$ from $B$-meson
decays containing charm quark(s) in the final states.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:32:15 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Cavoto",
"G.",
""
],
[
"Fleischer",
"R.",
""
],
[
"Trabelsi",
"K.",
""
],
[
"Zupan",
"J.",
""
]
] |
0706.4228 | Rostyslav Vlokh O | O. Mys, I. Martynyuk-Lototska, A. Grabar, Yu. Vysochanskii and R.
Vlokh | Piezooptic Coefficients and Acoustic Wave Velocities in Sn2P2S6 Crystals | 8 pages, 2 tables, 1 figure | Ukr.J.Phys.Opt. 2006 7: 124-128 | 10.3116/16091833/7/3/124/2006 | null | physics.optics physics.gen-ph | null | Piezooptic coefficients of Sn2P2S6 crystals are experimentally determined for
l=623.8 nm and T=293 K with the aid of interferometric technique. The
components of the elastic stiffness tensor for these crystals are calculated on
the basis of studies for the acoustic wave velocities. It is shown that
acoustooptic figure of merit can achieve extremely high values for Sn2P2S6
crystals (M2 - 2x10-12s3/kg2).
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:35:22 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Mys",
"O.",
""
],
[
"Martynyuk-Lototska",
"I.",
""
],
[
"Grabar",
"A.",
""
],
[
"Vysochanskii",
"Yu.",
""
],
[
"Vlokh",
"R.",
""
]
] |
0706.4229 | Hongjia Chen | Xiaoli Kong, Hongjia Chen, Chengming Bai | Classification of Graded Left-symmetric Algebra Structures on Witt and
Virasoro Algebras | 22 pages | Internat. J. Math. 22 (2011), no. 2, 201-222 | 10.1142/S0129167X11006751 | null | math.QA math-ph math.MP | null | We find that a compatible graded left-symmetric algebra structure on the Witt
algebra induces an indecomposable module of the Witt algebra with 1-dimensional
weight spaces by its left multiplication operators. From the classification of
such modules of the Witt algebra, the compatible graded left-symmetric algebra
structures on the Witt algebra are classified. All of them are simple and they
include the examples given by Chapoton and Kupershmidt. Furthermore, we
classify the central extensions of these graded left-symmetric algebras which
give the compatible graded left-symmetric algebra structures on the Virasoro
algebra. They coincide with the examples given by Kupershmidt.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:36:43 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 14:18:31 GMT"
}
] | 2020-11-18T00:00:00 | [
[
"Kong",
"Xiaoli",
""
],
[
"Chen",
"Hongjia",
""
],
[
"Bai",
"Chengming",
""
]
] |
0706.4230 | N. V. Shcherbina | Nikolay Shcherbina | On the set of complex points of a 2-sphere | 17 pages, 7 figures | Ann. Scuola Norm. Sup. Pisa, Vol. VIII, issue 1 (2009) | null | null | math.CV | null | Let $G$ be a strictly pseudoconvex domain in $\mathbb{C}^2$ with
$C^\infty$-smooth boundary $\partial G$. Let $S$ be a 2-dimensional sphere
embedded into $\partial G$. Denote by $\mathcal{E}$ the set of all complex
points on $S$. We study how the structure of the set $\mathcal{E}$ depends on
the smoothness of $S$
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:37:41 GMT"
}
] | 2013-02-20T00:00:00 | [
[
"Shcherbina",
"Nikolay",
""
]
] |
0706.4231 | Jean-Pierre Rivet | Jean Gay (LG), Francois Fressin (LG), Jean-Pierre Rivet (OCA), Yves
Rabbia (LG), Christophe Buisset (LG) | Un coronographe interf\'erentiel achromatique coaxial | null | ComptesRendusPhysique6:1169-1175,2005 | 10.1016/j.crhy.2005.12.001 | null | astro-ph | null | On-axis achromatic interfero-coronagraph. We present a new type of stellar
interfero-coronagraph, the "CIAXE", which is a variant of the "AIC", the
Achromatic Interfero-Coronagraph [3,4]. The CIAXE is characterized by a very
simple, compact and fully coaxial optical combination. Indeed, contrarily to
the classical AIC which has a Michelson interferometer structure, the CIAXE
delivers its output beam on the same axis as the input beam. This will ease its
insertion in the focal instrumentation of existing telescopes or next
generation ones. Such a device could be a step forward in the field of
instrumental search for exoplanets.
-----
Dans le but deparvenir \`a l'imagerie \`a haute dynamique d'objets comme les
exoplan\`etes, nous pr\'esentons ici un nouveau concept de coronographe
stellaire interf\'erentiel, le "CIAXE". Il est d\'eriv\'e du "CIA", le
Coronographe Interf\'erentiel Achromatique. Le CIAXE se distingue de son
pr\'ed\'ecesseur par une combinaison optique originale, simplifi\'ee, tr\`es
compacte et totalement coaxiale. En effet, \`a la diff\'erence du CIA classique
qui est d\'eriv\'e de l'interf\'erom\`etre de Michelson, le CIAXE d\'elivre son
faisceau de sortie sur le m\^eme axe que le faisceau d'entr\'ee, ce qui
facilitera grandement son insertion au sein de l'instrumentation focale d'un
t\'elescope. Un tel dispositif pourrait constituer une avanc\'ee en mati\`ere
d'instrumentation focale pour la recherche d'exoplan\`etes.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:43:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gay",
"Jean",
"",
"LG"
],
[
"Fressin",
"Francois",
"",
"LG"
],
[
"Rivet",
"Jean-Pierre",
"",
"OCA"
],
[
"Rabbia",
"Yves",
"",
"LG"
],
[
"Buisset",
"Christophe",
"",
"LG"
]
] |
0706.4232 | Cyprien Gay | Hugues Vandeparre (LPCP), Julien L\'eopold\`es (LPCP), Christophe
Poulard (LPCP), Sylvain Desprez (LPCP), Gwennaelle Derue (LPCP), Cyprien Gay
(CRPP), Pascal Damman (LPCP) | Slippery or sticky ! Control of wrinkling patterns by selective adhesion | 5 pages, 4 figures, 17 references | null | null | null | cond-mat.soft | null | Wrinkling patterns at the metallized surface of thin polymer films are shown
to be sensitive to the sticky or slippery character of the polymer/substrate
interface (titanium coating, polystyrene film and coated silicon substrate).
Selective prefered wrinkle orientation and amplitude are achieved. Existing
theoretical models are expanded to specific boundary conditions (adhesive vs
slippery) and rationalize these observations.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:45:19 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Vandeparre",
"Hugues",
"",
"LPCP"
],
[
"Léopoldès",
"Julien",
"",
"LPCP"
],
[
"Poulard",
"Christophe",
"",
"LPCP"
],
[
"Desprez",
"Sylvain",
"",
"LPCP"
],
[
"Derue",
"Gwennaelle",
"",
"LPCP"
],
[
"Gay",
"Cyprien",
"",
"CRPP"
],
[
"Damman",
"Pascal",
"",
"LPCP"
]
] |
0706.4233 | Frank Vallentin | Frank Vallentin | Symmetry in semidefinite programs | 10 pages (v3) minor changes, to appear in Linear Algebra and Its
Applications | Linear Algebra and Appl. 430 (2009), 360-369 | 10.1016/j.laa.2008.07.025 | null | math.OC math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is a tutorial in a general and explicit procedure to simplify
semidefinite programs which are invariant under the action of a symmetry group.
The procedure is based on basic notions of representation theory of finite
groups. As an example we derive the block diagonalization of the Terwilliger
algebra of the binary Hamming scheme in this framework. Here its connection to
the orthogonal Hahn and Krawtchouk polynomials becomes visible.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:49:31 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jul 2008 14:44:06 GMT"
},
{
"version": "v3",
"created": "Wed, 30 Jul 2008 14:31:04 GMT"
}
] | 2008-10-24T00:00:00 | [
[
"Vallentin",
"Frank",
""
]
] |
0706.4234 | Rostyslav Vlokh O | R. Vlokh, O. Mys and O. Vlokh | Indicative Surfaces for Crystal Optical Effects | 7 pages, 5 figures | Ukr. J. Phys. Opt. 2005 6: 150-154 | 10.3116/16091833/6/4/150/2005 | null | physics.optics physics.gen-ph | null | This paper has mainly a pedagogical meaning. Our aim is to demonstrate a
correct general approach for constructing indicative surfaces of higher-rank
tensors. We reconstruct the surfaces of piezo-optic tensor for beta-BaB2O4 and
LiNbO3 crystals, which have been incorrectly presented in our recent papers.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:47:25 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Vlokh",
"R.",
""
],
[
"Mys",
"O.",
""
],
[
"Vlokh",
"O.",
""
]
] |
0706.4235 | Sandrine Bec | Karim Demmou (LTDS), Sandrine Bec (LTDS), Jean-Luc Loubet (LTDS) | Effect of hydrostatic pressure on elastic properties of ZDTP tribofilms | null | null | null | null | physics.class-ph | null | Previous studies have shown that the elastic properties of Zinc
Dialkyl-dithiophosphate (ZDTP) tribofilms measured by nanoindentation increase
versus applied pressure (Anvil effect) [1, 2]. The aim of this paper is to
demonstrate that, up to 8 GPa, this increase is a reversible phenomenon. A ZDTP
tribofilm has been produced on "AISI 52100" steel substrate using a
Cameron-Plint tribometer. After its formation, a hydrostatic pressure of about
8 GPa was applied during one minute on the tribofilm using a large radius steel
ball ("Brinell-like" test). Nanoindentation tests were performed with a
Berkovich tip on pads in order to measure and compare the mechanical properties
of the tribofilm inside and outside the macroscopic plastically deformed area.
Careful AFM observations have been carried out on each indent in order to take
into account actual contact area. No difference in elastic properties was
observed between the two areas: tribofilm modulus and pressure sensitivity are
the same inside and outside the residual hemispherical print. This demonstrates
that Anvil effect is a reversible phenomenon in the studied pressure range.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:50:00 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Demmou",
"Karim",
"",
"LTDS"
],
[
"Bec",
"Sandrine",
"",
"LTDS"
],
[
"Loubet",
"Jean-Luc",
"",
"LTDS"
]
] |
0706.4236 | Spalek | Jozef Spalek | t-J model then and now: A personal perspective from the pioneering times | 14 pages without figures, lecture presented at the XII National
School "Correlated Electrons Systems Then and Now", Ustron, Poland (September
2006) | Acta Physica Polonica A {\bf 111}, 409-24 (2007) | null | null | cond-mat.str-el | null | In this overview I sketch briefly the path to the so-called {\em t-J model}
derived for the first time 30 years ago and provide its original meaning within
the theory of strongly correlated magnetic metals with a non-Fermi (non-Landau)
liquid ground state. An emergence of the concept of {\em real space pairing},
is discussed in a historical prospective. A generalization of this model to the
many-orbital situation is briefly discussed. The emphasis is put on didactical
exposition of ideas, as they were transformed into mathematical language. The
concept of {\em hybrid pairing} is introduced in the same context at the end.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:50:32 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Spalek",
"Jozef",
""
]
] |
0706.4237 | Jean-Pierre Rivet | Lyu Abe (LUAN), Mathilde Beaulieu (LUAN), Farrokh Vakili (LUAN), Jean
Gay (LG), Jean-Pierre Rivet (OCA), Sebastien Dervaux (LG), Armando Domiciano
De Souza (LUAN, LG) | On-sky observations with an achromatic hybrid phase knife coronagraph in
the visible | null | Astronomy and Astrophysics 461 (01/01/2007) 365-371 | 10.1051/0004-6361:20065150 | null | astro-ph | null | CONTEXT: The four-quadrant phase mask stellar coronagraph, introduced by D.
Rouan et al., is capable of achieving very high dynamical range imaging and was
studied in the context of the direct detection of extra-solar planets.
Achromatic four-quadrant phase mask is currently being developed for broadband
IR applications. AIMS: We report on laboratory and on-sky tests of a prototype
coronagraph in the visible. This prototype, the achromatic hybrid phase knife
coronagraph, was derived from the four-quadrant phase mask principle. METHODS:
The instrumental setup implementing the coronagraph itself was designed to
record the pre- and post-coronagraphic images simultaneously so that an
efficient real-time image selection procedure can be performed. We describe the
coronagraph and the associated tools that enable robust and repeatable
observations. We present an algorithm of image selection that has been tested
against the real on-sky data of the binary star HD80081 (* 38 Lyn). RESULTS
Although the observing conditions were poor, the efficiency of the proposed
method is proven. From this experiment, we derive procedures that can apply to
future focal instruments associating adaptive optics and coronagraphy,
targeting high dynamic range imaging in astronomy, such as detecting
extra-solar planets.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:57:53 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Abe",
"Lyu",
"",
"LUAN"
],
[
"Beaulieu",
"Mathilde",
"",
"LUAN"
],
[
"Vakili",
"Farrokh",
"",
"LUAN"
],
[
"Gay",
"Jean",
"",
"LG"
],
[
"Rivet",
"Jean-Pierre",
"",
"OCA"
],
[
"Dervaux",
"Sebastien",
"",
"LG"
],
[
"De Souza",
"Armando Domiciano",
"",
"LUAN, LG"
]
] |
0706.4238 | Florentin Smarandache | Florentin Smarandache, Mircea Eugen Selariu | Immediate Calculation of some Poisson Type Integrals Using
Supermathematics Circular Ex-Centric Functions | 10 pages, 3 figures | null | null | null | math.GM | null | This article presents two methods, in parallel, of solving more complex
integrals, among which is the Poisson's integral, in order to emphasize the
obvious advantages of a new method of integration, which uses the
supermathematics circular ex-centric functions.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 13:59:10 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Smarandache",
"Florentin",
""
],
[
"Selariu",
"Mircea Eugen",
""
]
] |
0706.4239 | Jimi Lee Truelsen | Jimi Lee Truelsen | Quantum Unique Ergodicity for Eisenstein Series on the Hilbert Modular
Group over a Totally Real Field | 28 pages | null | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | W. Luo and P. Sarnak have proved the quantum unique ergodicity property for
Eisenstein series on $\rm{PSL}(2,\mathbb{Z}) \backslash H$. We extend their
result to Eisenstein series on $\rm{PSL}(2,O) \backslash H^n$, where $O$ is the
ring of integers in a totally real field of degree $n$ over $Q$ with narrow
class number one, using the Eisenstein series considered by I. Efrat. We also
give an expository treatment of the theory of Hecke operators on
non-holomorphic Hilbert modular forms.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:55:26 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Jul 2007 08:11:21 GMT"
},
{
"version": "v3",
"created": "Tue, 18 Nov 2008 12:04:48 GMT"
}
] | 2008-11-18T00:00:00 | [
[
"Truelsen",
"Jimi Lee",
""
]
] |
0706.4240 | Gustav Sonne | Gustav Sonne, Leonid Y. Gorelik, Robert I. Shekhter and Mats Jonson | High-temperature excess current and quantum suppression of electronic
backscattering in a 1-D system | 4 pages, 4 figures | Europhys. Lett. 84, 27002 (2008) | 10.1209/0295-5075/84/27002 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the electronic current through a one-dimensional conductor in the
ballistic transport regime and show that the quantum oscillations of a weakly
pinned single scattering target results in a temperature- and bias-voltage
independent excess current at large bias voltages. This is a genuine effect on
transport that derives from an exponential reduction of electronic
backscattering in the elastic channel due to quantum delocalization of the
scatterer and from suppression of low-energy electron backscattering in the
inelastic channels caused by the Pauli exclusion principle. We show that both
the mass of the target and the frequency of its quantum vibrations can be
measured by studying the differential conductance and the excess current. We
apply our analysis to the particular case of a weakly pinned C60 molecule
encapsulated by a single-wall carbon nanotube and find that the discussed
phenomena are experimentally observable.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:04:14 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 17:27:56 GMT"
},
{
"version": "v3",
"created": "Mon, 8 Nov 2010 07:25:15 GMT"
}
] | 2010-11-09T00:00:00 | [
[
"Sonne",
"Gustav",
""
],
[
"Gorelik",
"Leonid Y.",
""
],
[
"Shekhter",
"Robert I.",
""
],
[
"Jonson",
"Mats",
""
]
] |
0706.4241 | Noam Soker | Noam Soker (Technion, Israel) | The role of thermal pressure in jet launching | To appear in the proceedings of Star-disk interaction in young stars,
Grenoble 2007, ed. J. Bouvier | null | 10.1017/S1743921307009556 | null | astro-ph | null | I present and discuss a unified scheme for jet launching that is based on
stochastic dissipation of the accretion disk kinetic energy, mainly via shock
waves. In this scheme, termed thermally-launched jet model, the kinetic energy
of the accreted mass is transferred to internal energy, e.g., heat or magnetic
energy. The internal energy accelerates a small fraction of the accreted mass
to high speeds and form jets. For example, thermal energy forms a pressure
gradient that accelerates the gas. A second acceleration stage is possible
wherein the primary outflow stretches magnetic field lines. The field lines
then reconnect and accelerate small amount of mass to very high speeds. This
double-stage acceleration process might form highly relativistic jets from
black holes and neutron stars. The model predicts that detail analysis of
accreting brown dwarfs that launch jets will show the mass accretion rate to be
larger than 10^{-9}-10^{-8} Mo/year, which is higher than present claims in the
literature.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:14:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Soker",
"Noam",
"",
"Technion, Israel"
]
] |
0706.4242 | Federico Alberto Ceccopieri | Federico A. Ceccopieri (Parma U.), Luca Trentadue (Parma U. and INFN,
Parma) | An application of transverse-momentum-dependent evolution equations in
QCD | 6 pages, page format corrected | Phys.Lett.B660:43-48,2008 | 10.1016/j.physletb.2007.11.095 | null | hep-ph | null | The properties and behaviour of the solutions of the recently obtained
$k_t$-dependent evolution equations are investigated. When used to reproduce
transverse momentum spectra of hadrons in Semi-Inclusive DIS, an encouraging
agreement with data is found. The present analysis also supports at the
phenomenological level the factorization properties of the Semi-Inclusive DIS
cross-sections in terms of $k_t$-dependent distributions. Further improvements
and possible developments of the proposed evolution equations are envisaged.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:15:20 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 09:59:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ceccopieri",
"Federico A.",
"",
"Parma U."
],
[
"Trentadue",
"Luca",
"",
"Parma U. and INFN,\n Parma"
]
] |
0706.4243 | Alexander Agafonov | A.I. Agafonov (Russian Research Center "Kurchatov Institute") | Massless Wave States of Two-Fermion Systems | 20 pages, no figures | null | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that in the ladder approximation the relativistic two-fermion
bound-state equation of Bethe and Salpeter has solutions corresponding to the
binding energy equal to the total mass of the particles. The study of these
massless states has been carried out only for the bound system at rest. Of
course, such composite boson can not be in the state of rest. But it is more
importantly that this approach for the massless boson can not be interpreted as
the limiting case of a nonzero mass system because the phase velocity of the
boson wave must equal to the speed of light. Using the Bethe-Salpeter equation
in the ladder approximation, we have obtained the wave equation for the
massless bound states of two fermions with equal masses and the electromagnetic
interaction between them. Neglecting retardation of the interaction, solutions
corresponded to the stationary wave states of the composite boson, have been
found. The boson wave function can be represented as an infinite, straight
thread, the transverse radius of which is more than the Compton wavelength of
the fermion. Two energy branches of the bosons with quantized energies have
been determined. The appearance of these branches is due to the strong
renormalization of the fine structure constant for the massless states.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:19:08 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Feb 2010 13:40:04 GMT"
}
] | 2010-02-04T00:00:00 | [
[
"Agafonov",
"A. I.",
"",
"Russian Research Center \"Kurchatov Institute\""
]
] |
0706.4244 | Marco Roncadelli | Marco Roncadelli | Behind Pvlas | Talk given at the ``XII International Workshop on Neutrino
Telescopes'' (to appear in the Proceedings) | null | null | null | hep-ph | null | We offer a detailed review of the physics behind the PVLAS experiment. We
also address some laboratory and astrophysical cross-checks for the recent
claim concerning a signal consistent with an Axion-Like Particle. Our aim is
that the leading role played by Emilio (Mimmo) Zavattini in this field of
research will become apparent.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:19:29 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Roncadelli",
"Marco",
""
]
] |
0706.4245 | Dmitri Kazakov | D. I. Kazakov and L. V. Bork | Conformal Invariance = Finiteness and Beta Deformed N=4 SYM Theory | 15 pages, Latex, 1 figure axodraw style | JHEP 0708:071,2007 | 10.1088/1126-6708/2007/08/071 | null | hep-th | null | We claim that if by a choice of the couplings the theory can be made
conformally invariant (vanishing of the beta functions) it is automatically
finite and vice versa. This is demonstrated by explicit example in
supersymmetric gauge theory. The formalism is then applied to the beta deformed
${\cal N}=4$ SYM theory and it is shown that the requirement of conformal
invariance = finiteness can be achieved for any complex parameter of
deformations.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:24:42 GMT"
}
] | 2009-04-30T00:00:00 | [
[
"Kazakov",
"D. I.",
""
],
[
"Bork",
"L. V.",
""
]
] |
0706.4246 | Thomas Richard Marsh | T.R. Marsh | High-Speed Optical Spectroscopy | To appear in the proceedings of the meeting on High Time Resolution
Astrophysics, Galway, June 2006 | null | 10.1007/978-1-4020-6518-7_5 | null | astro-ph | null | The large surveys and sensitive instruments of modern astronomy are turning
ever more examples of variable objects, many of which are extending the
parameter space to testing theories of stellar evolution and accretion. Future
projects such as the Laser Interferometer Space Antenna (LISA) and the Large
Synoptic Survey Telescope (LSST) will only add more challenging candidates to
this list. Understanding such objects often requires fast spectroscopy, but the
trend for ever larger detectors makes this difficult. In this contribution I
outline the science made possible by high-speed spectroscopy, and consider how
a combination of the well-known progress in computer technology combined with
recent advances in CCD detectors may finally enable it to become a standard
tool of astrophysics.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:20:13 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Marsh",
"T. R.",
""
]
] |
0706.4247 | Henry Wilton | Martin R. Bridson, Henry Wilton | Subgroup separability in residually free groups | 8 pages, no figures | null | null | null | math.GR | null | We prove that the finitely presentable subgroups of residually free groups
are separable and that the subgroups of type $\mathrm{FP}_\infty$ are virtual
retracts. We describe a uniform solution to the membership problem for finitely
presentable subgroups of residually free groups.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:37:31 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Bridson",
"Martin R.",
""
],
[
"Wilton",
"Henry",
""
]
] |
0706.4248 | Sarah Maddison | S. T. Maddison (1), L. Fouchet (2 and 3), J.-F. Gonzalez (2) ((1)
Swinburne, Australia, (2) CRAL, Lyon, France, (3) ETH, Zurich, Switzerland) | Gap Formation in the Dust Layer of 3D Protoplanetary Disks | 5 page, 4 figures. Accepted for publication in Astrophysics & Space
Science | Astrophys.SpaceSci.311:3-7,2007 | 10.1007/s10509-007-9572-y | null | astro-ph | null | We numerically model the evolution of dust in a protoplanetary disk using a
two-phase (gas+dust) Smoothed Particle Hydrodynamics (SPH) code, which is
non-self-gravitating and locally isothermal. The code follows the three
dimensional distribution of dust in a protoplanetary disk as it interacts with
the gas via aerodynamic drag. In this work, we present the evolution of a disk
comprising 1% dust by mass in the presence of an embedded planet for two
different disk configurations: a small, minimum mass solar nebular (MMSN) disk
and a larger, more massive Classical T Tauri star (CTTS) disk. We then vary the
grain size and planetary mass to see how they effect the resulting disk
structure. We find that gap formation is much more rapid and striking in the
dust layer than in the gaseous disk and that a system with a given stellar,
disk and planetary mass will have a different appearance depending on the grain
size and that such differences will be detectable in the millimetre domain with
ALMA. For low mass planets in our MMSN models, a gap can open in the dust disk
while not in the gas disk. We also note that dust accumulates at the external
edge of the planetary gap and speculate that the presence of a planet in the
disk may facilitate the growth of planetesimals in this high density region.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:45:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Maddison",
"S. T.",
"",
"2 and 3"
],
[
"Fouchet",
"L.",
"",
"2 and 3"
],
[
"Gonzalez",
"J. -F.",
""
]
] |
0706.4249 | Stefan Thurner | Rudolf Hanel and Stefan Thurner | Solution of the Unanimity Rule on exponential, uniform and scalefree
networks: A simple model for biodiversity collapse in foodwebs | 4 pages, 3 figs | null | 10.1140/epjb/e2008-00160-7 | null | physics.bio-ph q-bio.PE | null | We solve the Unanimity Rule on networks with exponential, uniform and
scalefree degree distributions. In particular we arrive at equations relating
the asymptotic number of nodes in one of two states to the initial fraction of
nodes in this state. The solutions for exponential and uniform networks are
exact, the approximation for the scalefree case is in perfect agreement with
simulation results. We use these solutions to provide a theoretical
understanding for experimental data on biodiversity loss in foodwebs, which is
available for the three network types discussed. The model allows in principle
to estimate the critical value of species that have to be removed from the
system to induce its complete collapse.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:43:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hanel",
"Rudolf",
""
],
[
"Thurner",
"Stefan",
""
]
] |
0706.4250 | Yoshikazu Fujiwara | Y. Fujiwara (1), M. Kohno (2), Y. Suzuki (3) ((1) Kyoto, (2) Kyushu
Dental, (3) Niigata) | n alpha Resonating-Group Calculation with a Quark-Model G-Matrix NN
Interaction | 26 pages, 8 figures | Prog.Theor.Phys.120:289-314,2008 | 10.1143/PTP.120.289 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate n alpha phase-shifts and scattering observables in the
resonating-group method, using the nuclear-matter G-matrix of an SU_6
quark-model NN interaction. The G-matrix is generated in the recent
energy-independent procedure of the quark-model NN interaction with the
continuous prescription for intermediate spectra, by assuming an appropriate
Fermi momentum k_F=1.2 fm^-1. The n alpha RGM interaction kernels are evaluated
with explicit treatments of the nonlocality and momentum dependence of
partial-wave G-matrix components. The momentum dependence of the G-matrix
components is different for each of the nucleon-exchange and interaction types.
Without introducing any artificial parameters except for k_F, the central and
spin-orbit components of the n alpha Born kernel are found to have reasonable
strengths under the assumption of a rigid translationally invariant shell-model
wave function of the alpha-cluster. The characteristic behaviors of three
different exchange terms, corresponding to knockout, heavy-particle pickup and
nucleon-rearrangement processes, are essentially the same between the case of
previous local effective NN forces and the case of nonlocal G-matrix NN
interactions.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 14:54:22 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Aug 2008 11:17:10 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Fujiwara",
"Y.",
""
],
[
"Kohno",
"M.",
""
],
[
"Suzuki",
"Y.",
""
]
] |
0706.4251 | Ryuichi Shindou | Ryuichi Shindou, Leon Balents | Gradient expansion approach to multiple-band Fermi liquids | 29 pages, 7 figures | Physical Review B {\bf 77}, 035110 (2008) | 10.1103/PhysRevB.77.035110 | null | cond-mat.str-el cond-mat.mes-hall | null | Promoted by the recent progress of Berry phase physics in spin
galvanomagnetic communities, we develop a systematic derivation of the reduced
Keldysh equation (RKE) which captures the low-energy dynamics of
quasi-particles constrained within doubly degenerate bands forming a single
Fermi surface. Specifically, we project out the fully occupied/empty band
degrees of freedom perturbatively in the gradient expansion, whose coupling
constant measures how a system is disequilibrated. As for the electron-electron
interactions, however, we only employ the so-called adiabatic assumption of the
Fermi liquid theory, so that the effect of electron correlations onto the
adiabatic transport of quasi-particles, i.e. the hermitian (real) part of the
self-energy, is taken into account in an unbiased manner.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:12:30 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 05:34:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shindou",
"Ryuichi",
""
],
[
"Balents",
"Leon",
""
]
] |
0706.4252 | Bj\"orn B\"auchle | Bjoern Baeuchle | Mach cones in Heavy Ion Collisions | Diploma Thesis, 72 pages. Added reference to Adams | null | null | null | nucl-th | null | MACE, a model for the propagation of mach cones in the velocity field of
heavy ion collisions (as created by hydrodynamical models) is explained. It is
tested on an analytical test case (static medium) and applied to velocity
fields created by the Particle-in-Cell model from LHC and RHIC initial
conditions.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:21:44 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 09:29:02 GMT"
}
] | 2007-07-12T00:00:00 | [
[
"Baeuchle",
"Bjoern",
""
]
] |
0706.4253 | Ferdinand Evers | Peter Schmitteckert and Ferdinand Evers | Exact ground state density functional theory for impurity models coupled
to external reservoirs and transport calculations | 4 pages, 4 figures | null | 10.1103/PhysRevLett.100.086401 | null | cond-mat.mes-hall cond-mat.str-el | null | A method is presented, which employs the density matrix renormalization group
technique in order to construct exact ground state exchange correlation
functionals for models of correlated electron systems coupled to external
reservoirs. The technique is applied to the M-site resonant level model. We
calculate its exact Kubo-conductance, which is available within DMRG, and
compare to the single-particle conductance obtained from Kohn-Sham energies and
orbitals of the exact ground state density functional theory (DFT). It is found
that the position of transport resonances is reproduced essentially exactly,
while deviations in the level broadening can be less than 1% and do not exceed
10%. Our findings lend strong support to a recently held point of view, namely
that approximations in the ground state functionals used in DFT based transport
calculations can lead to drastic errors in transport calculations while
exchange correlation contributions to the induced effective potential tend to
be less significant.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:22:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schmitteckert",
"Peter",
""
],
[
"Evers",
"Ferdinand",
""
]
] |
0706.4254 | Dong-Woo Kim | Dong-Woo Kim, Eunhyeuk Kim, Giuseppina Fabbiano and Ginevra Trinchieri | X-ray Tail in NGC 7619 | ApJ accepted to appear in the 2008 December 1 issue; Added discussion
on sloshing | null | 10.1086/592211 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new observational results of NGC 7619, an elliptical galaxy with a
prominent X-ray tail and a dominant member of the Pegasus group. With Chandra
and XMM-Newton observations, we confirm the presence of a long X-ray tail in
the SW direction; moreover, we identify for the first time a sharp
discontinuity of the X-ray surface brightness in the opposite (NE) side of the
galaxy. The density, temperature and pressure jump at the NE discontinuity
suggest a Mach number ~1, corresponding to a galaxy velocity of ~500 km s-1,
relative to the surrounding hot gas. Spectral analysis of these data shows that
the Iron abundance of the hot gaseous medium is much higher (1-2 solar) near
the center of NGC 7619 and in the tail extending from the core than in the
surrounding regions (< 1/2 solar), indicating that the gas in the tail is
originated from the galaxy. The possible origin of the head-tail structure is
either on-going ram-pressure stripping or sloshing. The morphology of the
structure is more in line with a ram pressure stripping phenomenon, while the
position of NGC 7619 at the center of the Pegasus I group, and its dominance,
would prefer sloshing.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:23:39 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Sep 2008 16:24:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kim",
"Dong-Woo",
""
],
[
"Kim",
"Eunhyeuk",
""
],
[
"Fabbiano",
"Giuseppina",
""
],
[
"Trinchieri",
"Ginevra",
""
]
] |
0706.4255 | Simon Fossier | Jerome Lodewyck, Matthieu Bloch, Raul Garcia-Patron, Simon Fossier,
Evgueni Karpov, Eleni Diamanti, Thierry Debuisschert, Nicolas J. Cerf, Rosa
Tualle-Brouri, Steven W. McLaughlin, Philippe Grangier | Quantum key distribution over 25 km with an all-fiber
continuous-variable system | 11 pages, 5 figures, submitted to Phys. Rev. A | Phys. Rev. A 76, 042305 (2007) | 10.1103/PhysRevA.76.042305 | null | quant-ph | null | We report on the implementation of a reverse-reconciliated coherent-state
continuous-variable quantum key distribution system, with which we generated
secret keys at a rate of more than 2 kb/s over 25 km of optical fiber. Time
multiplexing is used to transmit both the signal and phase reference in the
same optical fiber. Our system includes all experimental aspects required for a
field implementation of a quantum key distribution setup. Real-time reverse
reconciliation is achieved by using fast and efficient LDPC error correcting
codes.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:23:44 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 14:12:24 GMT"
}
] | 2008-12-17T00:00:00 | [
[
"Lodewyck",
"Jerome",
""
],
[
"Bloch",
"Matthieu",
""
],
[
"Garcia-Patron",
"Raul",
""
],
[
"Fossier",
"Simon",
""
],
[
"Karpov",
"Evgueni",
""
],
[
"Diamanti",
"Eleni",
""
],
[
"Debuisschert",
"Thierry",
""
],
[
"Cerf",
"Nicolas J.",
""
],
[
"Tualle-Brouri",
"Rosa",
""
],
[
"McLaughlin",
"Steven W.",
""
],
[
"Grangier",
"Philippe",
""
]
] |
0706.4256 | Le Hur Karyn | Karyn Le Hur, Smitha Vishveshwara, Cristina Bena | Double-gap superconducting proximity effect in nanotubes | 4 pages, 2 figures | Phys. Rev B 77, 041406(R) (2008) | 10.1103/PhysRevB.77.041406 | null | cond-mat.str-el cond-mat.supr-con | null | We theoretically explore the possibility of a superconducting proximity
effect in single-walled metallic carbon nanotubes due to the presence of a
superconducting substrate. An unconventional double-gap situation can arise in
the two bands for nanotubes of large radius wherein the tunneling is (almost)
symmetric in the two sublattices. In such a case, a proximity effect can take
place in the symmetric band below a critical experimentally-accessible Coulomb
interaction strength in the nanotube. Furthermore, due to interactions in the
nanotube, the appearance of a BCS gap in this band stabilizes superconductivity
in the other band at lower temperatures. We also discuss the scenario of highly
asymmetric tunneling and show that this case too supports double-gap
superconductivity.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:25:13 GMT"
},
{
"version": "v2",
"created": "Sat, 22 Sep 2007 18:15:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hur",
"Karyn Le",
""
],
[
"Vishveshwara",
"Smitha",
""
],
[
"Bena",
"Cristina",
""
]
] |
0706.4257 | Romain Tessera | Romain Tessera | Isoperimetric profile and random walks on locally compact solvable
groups | 23 pages | null | null | null | math.GR math.MG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a large class of amenable locally compact groups containing all
solvable algebraic groups over a local field and their discrete subgroups. We
show that the isoperimetric profile of these groups is in some sense optimal
among amenable groups. We use this fact to compute the probability of return of
symmetric random walks, and to derive various other geometric properties which
are likely to be only satisfied by these groups.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:28:59 GMT"
},
{
"version": "v2",
"created": "Sat, 30 Jun 2007 22:34:44 GMT"
},
{
"version": "v3",
"created": "Mon, 27 Apr 2009 00:22:59 GMT"
},
{
"version": "v4",
"created": "Sat, 4 Dec 2010 18:20:20 GMT"
}
] | 2010-12-07T00:00:00 | [
[
"Tessera",
"Romain",
""
]
] |
0706.4258 | Ryuichi Shindou | Ryuichi Shindou, Ken-Ichiro Imura, Masao Ogata | Characterization of two-dimensional fermionic insulating states | null | Physical Review B {\bf 74}, 245107 (2006) (18 pages) | 10.1103/PhysRevB.74.245107 | null | cond-mat.str-el cond-mat.stat-mech | null | Inspired by the duality picture between superconductivity and insulator in
two spatial dimension, we conjecture that the order parameter, suitable for
characterizing 2D fermionic insulating state, is the disorder operator, usually
known in the context of statistical transformation. Namely, the change of the
phase of the disorder operator along a closed loop measures the particle
density accommodating inside this loop. Thus, identifying this (doped) particle
density with the dual counterpart of the magnetic induction in 2D SC, we can
naturally introduce the disorder operator as the dual order parameter of 2D
insulators. The disorder operator has a branch cut emitting from this
``vortex'' to the single infinitely far point. To test this conjecture against
an arbitrary 2D lattice models, we have chosen this branch cut to be compatible
with the periodic boundary condition and obtain a general form of its
expectation value for non-interacting metal/insulator wavefunction, including
gapped mean-field order wavefunction. Based on this expression, we observed
analytically that it indeed vanishes for a wide class of band metals in the
thermodynamic limit. In insulating states, on the other hand, it is quantified
by the localization length or the real-valued gauge invariant 2-from dubbed as
the quantum metric tensor.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:37:43 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 05:26:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shindou",
"Ryuichi",
""
],
[
"Imura",
"Ken-Ichiro",
""
],
[
"Ogata",
"Masao",
""
]
] |
0706.4259 | Paul Frampton | Paul H. Frampton and Thomas W. Kephart | Quiver Gauge Theory and Conformality at the TeV Scale | 175 pages latex. Changes suggested by Physics Reports reviewer.
Bibliography extended to include colleagues' suggestions | Phys.Rept.454:203-269,2008 | 10.1016/j.physrep.2007.09.005 | null | hep-ph astro-ph gr-qc hep-th | null | This review describes the conformality approach to extending the standard
model of particle phenomenology using an assumption of no conformal anomaly at
high energy. Topics include quiver gauge theory, the conformality approach to
phenomenology, strong-electroweak unification at 4 TeV, cancellation of
quadratic divergences, cancellation of U(1) anomalies, and a dark matter
candidate.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:56:26 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Sep 2007 18:55:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Frampton",
"Paul H.",
""
],
[
"Kephart",
"Thomas W.",
""
]
] |
0706.4260 | Markus Hild | Markus Hild, Felix Schmitt, Ilona T\"urschmann, Robert Roth | Ultracold Bose gases in time-dependent 1D superlattices: response and
quasimomentum structure | 4 pages, 4 figures | Phys. Rev. A 76, 053614 (2007) | 10.1103/PhysRevA.76.053614 | null | cond-mat.stat-mech | null | The response of ultracold atomic Bose gases in time-dependent optical
lattices is discussed based on direct simulations of the time-evolution of the
many-body state in the framework of the Bose-Hubbard model. We focus on
small-amplitude modulations of the lattice potential as implemented in several
recent experiment and study different observables in the region of the first
resonance in the Mott-insulator phase. In addition to the energy transfer we
investigate the quasimomentum structure of the system which is accessible via
the matter-wave interference pattern after a prompt release. We identify
characteristic correlations between the excitation frequency and the
quasimomentum distribution and study their structure in the presence of a
superlattice potential.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:46:41 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 06:24:02 GMT"
},
{
"version": "v3",
"created": "Tue, 14 Aug 2007 11:26:31 GMT"
}
] | 2008-06-30T00:00:00 | [
[
"Hild",
"Markus",
""
],
[
"Schmitt",
"Felix",
""
],
[
"Türschmann",
"Ilona",
""
],
[
"Roth",
"Robert",
""
]
] |
0706.4261 | \'Agnes Pallinger | A. Pallinger, G. Kriza, B. Sas, I. Pethes, K. Vad, and F. I. B.
Williams | Free flux flow magneto-resistance of single crystal BSCCO | 7 pages, 6 figures, to be published in Phys. Rev. B | null | null | null | cond-mat.supr-con | null | Measurement of the free flux flow resistance in monocrystalline highly
anisotropic BSCCO reveals a low field magneto-resistive effect nearly 100 times
that expected from a naive application of the Bardeen-Stephen rule R/Rn =
B/Bc2. Furthermore in the vortex solid phase it saturates to a constant value
at about Hc2/100 as if the vortices were moving 100 times faster than expected.
An attempt to account for this behavior by a combination of sheared planar
vortex flow obeying the BS rule and the quasi-particle c axis conductivity
between the Josephson coupled superconducting planes is only partially
successful. In particular it is unable to account for the saturation feature
which occurs in both optimally and underdoped samples in the low temperature
vortex solid phase.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 15:53:38 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Pallinger",
"A.",
""
],
[
"Kriza",
"G.",
""
],
[
"Sas",
"B.",
""
],
[
"Pethes",
"I.",
""
],
[
"Vad",
"K.",
""
],
[
"Williams",
"F. I. B.",
""
]
] |
0706.4262 | Hessel Posthuma | Hessel Posthuma | The Heisenberg group and conformal field theory | 45 pages, some parts have been rewritten. Version to appear in Quart.
J. Math | null | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A mathematical construction of the conformal field theory (CFT) associated to
a compact torus, also called the "nonlinear Sigma-model" or "lattice-CFT", is
given. Underlying this approach to CFT is a unitary modular functor, the
construction of which follows from a "Quantization commutes with reduction"-
type of theorem for unitary quantizations of the moduli spaces of holomorphic
torus-bundles and actions of loop groups. This theorem in turn is a consequence
of general constructions in the category of affine symplectic manifolds and
their associated generalized Heisenberg groups.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 16:08:57 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Jan 2011 09:52:33 GMT"
},
{
"version": "v3",
"created": "Tue, 24 May 2011 07:40:58 GMT"
}
] | 2011-05-25T00:00:00 | [
[
"Posthuma",
"Hessel",
""
]
] |
0706.4263 | Simone Donati | S. Donati | CP violation in the B0s system | 8 pages, 11 figures, Proceedings of the "Flavor Physics and CP
Violation" Conference (FPCP07), May 12-17 2007, Bled, Slovenia | ECONF C070512:008,2007 | null | null | hep-ex | null | In this paper the most recent Tevatron results concerning CP violation in the
B0s system are reviewed. These are the measurement of the direct CP asymmetry
in the B0s->K-\pi+ decay performed by CDF and the measurement of \Delta\Gamma_s
and \phi_s performed by D0 in the B0s->J/\psi\phi decay.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 16:13:07 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 07:46:34 GMT"
},
{
"version": "v3",
"created": "Fri, 6 Jul 2007 06:12:30 GMT"
}
] | 2011-03-23T00:00:00 | [
[
"Donati",
"S.",
""
]
] |
0706.4264 | Mikhail Smondyrev | Bernd Gerlach (1), and Mikhail A. Smondyrev (2) ((1) Institut f\"ur
Physik, Universit\"at Dortmund, Germany, (2) N . N. Bogoliubov Laboratory of
Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Russia) | Upper and lower bounds for the large polaron dispersion in $D=1,2,3$
dimensions | RevTex 9 pages, 8 figures. Revised version contains previously absent
Introduction and Conclusions, new equations, new references and changes in
the text made following recommendations of PRB referees | null | 10.1103/PhysRevB.77.174303 | null | cond-mat.other | null | Numerical results for the polaron dispersion are presented for an arbitrary
number of space dimensions. Upper and lower bounds are calculated for the
dispersion curves. They are rather close to each other in the cases of small
electron-phonon couplings usual for real polar materials. To describe the
dispersion in other materials, we suggest a simple fitting formula which can be
applied at intermediate values of the Fr\"ohlich electron-phonon coupling
constant. Its validity is approved by the comparison with direct calculations
and previously obtained results. This makes our results not only reliable and
highly accurate but also easy reproducible.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 16:22:28 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jul 2007 14:06:16 GMT"
},
{
"version": "v3",
"created": "Fri, 5 Oct 2007 12:46:06 GMT"
},
{
"version": "v4",
"created": "Sun, 4 May 2008 11:55:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gerlach",
"Bernd",
""
],
[
"Smondyrev",
"Mikhail A.",
""
]
] |
0706.4265 | Masaaki Hiramatsu | Masaaki Hiramatsu, Takahiro Hayakawa, Ken'ichi Tatematsu, Kazuhisa
Kamegai, Toshikazu Onishi, Akira Mizuno, Nobuyuki Yamaguchi, and Tetsuo
Hasegawa | ASTE Submillimeter Observations of a Young Stellar Object Condensation
in Cederblad 110 | 30pages, 7 figures, Accepted for publication in ApJ | Astrophys.J.664:964-973,2007 | 10.1086/519269 | null | astro-ph | null | We present results of submillimeter observations of a low-mass young stellar
objects (YSOs) condensation in the Cederblad 110 region of the Chamaeleon I
dark cloud with Atacama Submillimeter Telescope Experiment. Our HCO+(J=4-3) map
reveals a dense molecular gas with an extent of ~ 0.1 pc, which is a complex of
two envelopes associated with class I sources Ced110 IRS4 and IRS11 and a very
young object Cha-MMS1. The other two class I sources in this region, IRS6 and
NIR89, are located outside the clump and have no extended HCO+ emission. HCO+
abundance is calculated to be 2.6 x 10^{-10} for MMS1 and 3.4 x 10^{-9} for
IRS4, which are comparable to the reported value for other young sources.
Bipolar outflows from IRS4 and IRS6 are detected in our 12CO(J=3-2) map. The
outflow from IRS4 seems to collide with Cha-MMS1. The outflow has enough
momentum to affect gas motion in MMS1, although no sign has been detected to
indicate that a triggered star formation has occurred.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 16:28:21 GMT"
}
] | 2011-02-11T00:00:00 | [
[
"Hiramatsu",
"Masaaki",
""
],
[
"Hayakawa",
"Takahiro",
""
],
[
"Tatematsu",
"Ken'ichi",
""
],
[
"Kamegai",
"Kazuhisa",
""
],
[
"Onishi",
"Toshikazu",
""
],
[
"Mizuno",
"Akira",
""
],
[
"Yamaguchi",
"Nobuyuki",
""
],
[
"Hasegawa",
"Tetsuo",
""
]
] |
0706.4266 | Wojciech Broniowski | Wojciech Broniowski, Piotr Bozek, Maciej Rybczynski | Fluctuating initial conditions in heavy-ion collisions from the Glauber
approach | 20 pages, 15 figures, additions include comparison to the CGC results | Phys.Rev.C76:054905,2007 | 10.1103/PhysRevC.76.054905 | null | nucl-th hep-ph nucl-ex | null | In the framework of the Glauber approach we analyze the shape parameters of
the early-formed system and their event-by-event fluctuations. We test a
variety of models: the conventional wounded nucleon model, a model admixing
binary collisions to the wounded nucleons, a model with hot spots, as well as
the hot-spot model where the deposition of energy occurs with a superimposed
probability distribution. We look in detail at the so-called participant
multipole moments, obtained by an averaging procedure where in each event the
system is translated to its center of mass and aligned with the major principal
axis of the ellipse of inertia. Quantitative comparisons indicate substantial
relative effects for eccentricity in variants of Glauber models. On the other
hand, the dependence of the scaled standard deviation of the participant
eccentricity on the chosen model is weak. For all models the values range from
about 0.5 for the central collisions to about 0.3-0.4 for peripheral
collisions, both for the gold-gold and copper-copper collisions. They are
dominated by statistics and change only by 10-15% from model to model. We
provide an approximate analytic expansion for the multipole moments and their
fluctuations given in terms of the fixed-axes moments. For central collisions
and in the absence of correlations it gives the simple formula for the scaled
standard deviation of the participant eccentricity: sqrt(4/pi-1). Similarly, we
obtain expansions for the radial profiles of the multipole distributions. We
investigate the relevance of the shape-fluctuation effects for jet quenching
and find them important only for very central events. Finally, we argue how
smooth hydro leads to the known result v_4 ~ v_2^2, and further to the
prediction Delta v_4/v_4 = 2 Delta v_2/v_2.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 16:28:33 GMT"
},
{
"version": "v2",
"created": "Sun, 26 Aug 2007 14:42:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Broniowski",
"Wojciech",
""
],
[
"Bozek",
"Piotr",
""
],
[
"Rybczynski",
"Maciej",
""
]
] |
0706.4267 | Julio D Rossi | Fernando Charro, Jesus Garcia Azorero, Julio D. Rossi | A mixed problem for the infinity laplacian via Tug-of-War games | 13 pages. Final version | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we prove that a function $ u\in\mathcal{C}(\bar{\Omega})$ is
the continuous value of the Tug-of-War game described in \cite{PSSW} if and
only if it is the unique viscosity solution to the infinity laplacian with
mixed boundary conditions
{-\Delta_{\infty}u(x)=0\quad & \text{in} \Omega,
\frac{\partial u}{\partial n}(x)=0\quad & \text{on} \Gamma_N, u(x)=F(x)\quad
& \text{on} \Gamma_D. By using the results in \cite{PSSW}, it follows that this
viscous PDE problem has a unique solution, which is the unique {\it absolutely
minimizing Lipschitz extension} to the whole $\bar{\Omega}$ (in the sense of
\cite{Aronsson} and \cite{PSSW}) of the boundary data $ F:\Gamma_D\to\R $.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 16:32:43 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Apr 2008 16:42:53 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Jul 2009 14:02:09 GMT"
}
] | 2009-07-06T00:00:00 | [
[
"Charro",
"Fernando",
""
],
[
"Azorero",
"Jesus Garcia",
""
],
[
"Rossi",
"Julio D.",
""
]
] |
0706.4268 | Jae-Hyun Yang | Jae-Hyun Yang | Theory of the Siegel Modular Variety | 52 pages ; Correction of typographical errors; added two references | Proceedings of the International Conferences on Number Theory and
Cryptography, Edited by S. D. Adhikari and B. Ramakrishnan, Harish-Chandra
Institute, Allahabad, India : A publication of Hindustan Book Agency (2009),
219-278. | null | null | math.NT math.AG | null | In this paper, we discuss the theory of the Siegel modular variety in the
aspects of arithmetic and geometry. This article covers the theory of Siegel
modular forms, the Hecke theory, a lifting of elliptic cusp forms, geometric
properties of the Siegel modular variety, (hypothetical) motives attached to
Siegel modular forms and a cohomology of the Siegel modular variety.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 16:39:17 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jul 2007 03:23:23 GMT"
}
] | 2009-07-25T00:00:00 | [
[
"Yang",
"Jae-Hyun",
""
]
] |
0706.4269 | Poulose Poulose Dr. | S. Hesselbach (1), S. Moretti (1 and 2), S. Munir (1), P. Poulose (1)
((1)University of Southampton, (2) Orsay, LPT) | Exploring the Di-Photon Decay of a Light Higgs Boson in the MSSM With
Explicit CP Violation | 27 pages; LaTeX; minor changes in text; reference added; corrected
version to appear in EPJC | Eur.Phys.J.C54:129-147,2008 | 10.1140/epjc/s10052-007-0503-4 | SHEP-07-14, LPT-Orsay-07-129 | hep-ph | null | The di-photon decay channel of the lightest Higgs boson is considerd as a
probe to explore CP violation in the Minimal Supersymmetric Standard Model
(MSSM). The scalar/pseudo-scalar mixing is considered along with CP violation
entering through the Higgs-sfermion-sfermion couplings, with and without light
sparticles. The impact of a light stop on the decay width and Branching Ratio
(BR) is established through a detailed study of the amplitude of the process H1
--> gamma.gamma. The other sparticles have little influence even when they are
light. With a suitable combination of other MSSM parameters, a light stop can
change the BR by more than 50 % with a CP-violating phase phi_mu ~ 90 deg.,
while the change is almost nil with a heavy stop.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:14:34 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jul 2007 13:03:19 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Dec 2007 13:38:45 GMT"
},
{
"version": "v4",
"created": "Fri, 7 Dec 2007 14:15:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hesselbach",
"S.",
"",
"University of Southampton"
],
[
"Moretti",
"S.",
"",
"1 and 2"
],
[
"Munir",
"S.",
"",
"University of Southampton"
],
[
"Poulose",
"P.",
"",
"University of Southampton"
]
] |
0706.4270 | Jingbo Qi | J. Qi, Y. Xu, N. Tolk, X. Liu, J. K. Furdyna, and I. E. Perakis | Coherent Magnetization Precession in GaMnAs induced by Ultrafast Optical
Excitation | 7 pages,3 figures | null | 10.1063/1.2785114 | null | cond-mat.mtrl-sci | null | We use femtosecond optical pulses to induce, control and monitor
magnetization precession in ferromagnetic Ga0.965Mn0.035As. At temperatures
below ~40 K we observe coherent oscillations of the local Mn spins, triggered
by an ultrafast photoinduced reorientation of the in-plane easy axis. The
amplitude saturation of the oscillations above a certain pump intensity
indicates that the easy axis remains unchanged above ~TC/2. We find that the
observed magnetization precession damping (Gilbert damping) is strongly
dependent on pump laser intensity, but largely independent on ambient
temperature. We provide a physical interpretation of the observed light-induced
collective Mn-spin relaxation and precession.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:06:30 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jul 2007 23:05:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Qi",
"J.",
""
],
[
"Xu",
"Y.",
""
],
[
"Tolk",
"N.",
""
],
[
"Liu",
"X.",
""
],
[
"Furdyna",
"J. K.",
""
],
[
"Perakis",
"I. E.",
""
]
] |
0706.4271 | Leonardo Antonio Mendes de Souza | Leonardo A. M. Souza and M. C. Nemes | Characteristic Time and Maximum Mixedness: Single Mode Gaussian States
in Dissipative Channels | Accepted version | Physics Letters A, 372 (2008) 3616. | 10.1016/j.physleta.2008.02.040 | null | quant-ph | null | We derive an upper limit for the mixedness of single bosonic mode gaussian
states propagating in dissipative channels. It is a function of the initial
squeezing and temperature of the channel only. Moreover the time at which von
Neumann's entropy reaches its maximum value coincides with that of complete
loss of coherence, thus defining a quantum-classical transition.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:21:15 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Jul 2007 12:32:01 GMT"
},
{
"version": "v3",
"created": "Mon, 10 Sep 2007 17:48:18 GMT"
},
{
"version": "v4",
"created": "Mon, 5 Nov 2007 16:01:37 GMT"
},
{
"version": "v5",
"created": "Mon, 28 Apr 2008 08:35:46 GMT"
}
] | 2008-08-07T00:00:00 | [
[
"Souza",
"Leonardo A. M.",
""
],
[
"Nemes",
"M. C.",
""
]
] |
0706.4272 | Shawn Westmoreland | Shawn Westmoreland | On the principle of relativity and electrostatics in a flat spacetime
with a compact spatial dimension | 18 pages, 1 figure, this is a commentary on gr-qc/0503070v1. changes
in v2: title changed, typos corrected, minor changes in text, definition of
"topological locality" revised, references added | null | null | null | gr-qc | null | We study a flat spacetime with a compact spatial dimension and dispute the
claim of Bansal, Laing, and Sriharan that a local experiment can determine
whether or not an inertial observer is "privileged" in this spacetime.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:23:06 GMT"
},
{
"version": "v2",
"created": "Sun, 23 Dec 2007 06:21:07 GMT"
}
] | 2007-12-23T00:00:00 | [
[
"Westmoreland",
"Shawn",
""
]
] |
0706.4273 | David D. Awschalom | N. P. Stern, D. W. Steuerman, S. Mack, A. C. Gossard, and D. D.
Awschalom | Drift and Diffusion of Spins Generated by the Spin Hall Effect | 9 pages, 3 figures | Appl. Phys. Lett. 91, 062109 (2007) | 10.1063/1.2768633 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Electrically generated spin accumulation due to the spin Hall effect is
imaged in n-GaAs channels using Kerr rotation microscopy, focusing on its
spatial distribution and time-averaged behavior in a magnetic field.
Spatially-resolved imaging reveals that spin accumulation observed in
transverse arms develops due to longitudinal drift of spin polarization
produced at the sample boundaries. One- and two-dimensional drift-diffusion
modeling is used to explain these features, providing a more complete
understanding of observations of spin accumulation and the spin Hall effect.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:26:12 GMT"
}
] | 2007-08-09T00:00:00 | [
[
"Stern",
"N. P.",
""
],
[
"Steuerman",
"D. W.",
""
],
[
"Mack",
"S.",
""
],
[
"Gossard",
"A. C.",
""
],
[
"Awschalom",
"D. D.",
""
]
] |
0706.4274 | Arthur Straube V. | Arthur V. Straube and Arkady Pikovsky | Mixing-induced global modes in open active flow | new version with some minor changes, added journal reference and DOI
information; 4 pages, 4 figures, published in Physical Review Letters | Phys. Rev. Lett. 99, 184503 (2007) | 10.1103/PhysRevLett.99.184503 | null | nlin.PS | null | We describe how a convectively unstable active field in an open flow
configuration becomes absolutely unstable due to local mixing. A representation
of the mixing region as those with locally enhanced effective diffusion allows
us to find the linear transition point to unstable global mode analytically. We
derive the critical exponent characterizing weakly nonlinear regimes beyond
instability and compare it with numerical simulations of a full two-dimensional
flow problem.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:28:32 GMT"
},
{
"version": "v2",
"created": "Sun, 13 Apr 2008 12:33:49 GMT"
}
] | 2008-04-13T00:00:00 | [
[
"Straube",
"Arthur V.",
""
],
[
"Pikovsky",
"Arkady",
""
]
] |
0706.4275 | Emmanuel Trizac | E. Trizac, A. Barrat, M.H. Ernst | Boltzmann equation for dissipative gases in homogeneous states with
nonlinear friction | null | Phys. Rev. E 76, 031305 (2007) | 10.1103/PhysRevE.76.031305 | null | cond-mat.stat-mech | null | Combining analytical and numerical methods, we study within the framework of
the homogeneous non-linear Boltzmann equation, a broad class of models relevant
for the dynamics of dissipative fluids, including granular gases. We use the
new method presented in a previous paper [J. Stat. Phys. 124, 549 (2006)] and
extend our results to a different heating mechanism, namely a deterministic
non-linear friction force. We derive analytically the high energy tail of the
velocity distribution and compare the theoretical predictions with high
precision numerical simulations. Stretched exponential forms are obtained when
the non-equilibrium steady state is stable. We derive sub-leading corrections
and emphasize their relevance. In marginal stability cases, power-law behaviors
arise, with exponents obtained as the roots of transcendental equations. We
also consider some simple BGK (Bhatnagar, Gross, Krook) models, driven by
similar heating devices, to test the robustness of our predictions.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:30:21 GMT"
}
] | 2007-09-23T00:00:00 | [
[
"Trizac",
"E.",
""
],
[
"Barrat",
"A.",
""
],
[
"Ernst",
"M. H.",
""
]
] |
0706.4276 | Andrea Damascelli FA | I.S. Elfimov, G.A. Sawatzky, and A. Damascelli | Fermi pockets and correlation effects in underdoped YBa2Cu3O6.5 | A high-resolution version can be found at
http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/YBCO_OrthoII_LDA.pdf | Phys. Rev. B 77, 060504(R) (2008). | 10.1103/PhysRevB.77.060504 | null | cond-mat.str-el | null | The detection of quantum oscillations in the electrical resistivity of
YBa2Cu3O6.5 provides direct evidence for the existence of Fermi surface pockets
in an underdoped cuprate. We present a theoretical study of the electronic
structure of YBa2Cu3O7-d (YBCO) aiming at establishing the nature of these
Fermi pockets, i.e. CuO2 plane versus CuO chain or BaO. We argue that electron
correlation effects, such as orbital-dependent band distortions and highly
anisotropic self-energy corrections, must be taken into account in order to
properly interpret the quantum oscillation experiments.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:35:55 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 22:21:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Elfimov",
"I. S.",
""
],
[
"Sawatzky",
"G. A.",
""
],
[
"Damascelli",
"A.",
""
]
] |
0706.4277 | Boris Blankleider | A. N. Kvinikhidze and B. Blankleider | On the Wilsonian renormalization group equation for nuclear current
operators | 12 pages | Phys.Rev.C76:064003,2007 | 10.1103/PhysRevC.76.064003 | null | nucl-th | null | We present the solution to the recently derived Wilsonian renormalization
group (RG) equation for nuclear current operators. In order to eliminate the
present ambiguity in the RG equation itself, we introduce a new condition
specifying the cutoff independence of the five point Green function
corresponding to the two-body propagator with current operator insertion. The
resulting effective current operator is then shown to obey a modified
Ward-Takahashi identity which differs from the usual one, but that nevertheless
leads to current conservation.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:39:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kvinikhidze",
"A. N.",
""
],
[
"Blankleider",
"B.",
""
]
] |
0706.4278 | Rubens Ramos Viana | Joao Luzeilton de Oliveira, Rubens Viana Ramos | The minimal principals of Hermitian matrices and the negativity of
bipartite of qubit states | 4 pages | null | null | null | quant-ph | null | Quantum entanglement is an enigmatic and powerful property that has attracted
much attention due to its usefulness in new ways of communications, like
quantum teleportation and quantum key distribution. Much effort has been done
to quantify entanglement. Indeed, there exist some well-established
separability criterion and analytical formulas for the entanglement of
bipartite systems. In some of these, the crucial elements are the eigenvalues
of the partial transpose of the density matrix. In this paper, we show that one
can also have information about the entanglement of bipartite state, in C2xC2,
looking at the minimal principals of the partial transpose.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:41:36 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"de Oliveira",
"Joao Luzeilton",
""
],
[
"Ramos",
"Rubens Viana",
""
]
] |
0706.4279 | Hvedri Inassaridze | Antonio Cegarra and Remedios Gomez | Diagonal fibrations are pointwise fibrations | to be published in "Journal of Homotopy and Related Structures" | null | null | null | math.AT | null | On the category of bisimplicial sets there are different Quillen closed model
structures associated to various definitions of fibrations. In one of them,
which is due to Bousfield and Kan and that consists of seeing a bisimplicial
set as a simplicial object in the category of simplicial sets, fibrations are
those bisimplicial set maps such that each of the induced simplicial set maps
is a Kan fibration, that is, the pointwise fibrations. In another of them,
introduced by Moerdijk, a bisimplicial map is a fibration if it induces a Kan
fibration of associated diagonal simplicial sets, that is, the diagonal
fibrations. In this note, we prove that every diagonal fibration is a pointwise
fibration.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:45:08 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Cegarra",
"Antonio",
""
],
[
"Gomez",
"Remedios",
""
]
] |
0706.4280 | Vinu Lukose | Vinu Lukose and R. Shankar | Symmetry breaking by the sea of Dirac-Landau levels in graphene | 4 pages, 2 figures. Improved approximation, changes in equation for
phase boundary and numbers. Conclusions remain unchanged | null | null | null | cond-mat.mes-hall | null | The quantum Hall states of graphene have a filled Dirac sea of Landau levels.
The short ranged SU(4) symmetry breaking interactions can induce a staggered
polarization of the sea of Dirac-Landau levels. We study this effect in the
extended Hubbard model on a honeycomb lattice using mean field variational
wavefunctions. We find a valley symmetry broken, anti-ferromagnetic spin
ordered phase at $\nu=\pm 1$ when the on-site interaction is dominant. Our mean
field solution is consistent with the recently reported experimental results of
Z. Jiang et. al.\cite{jiang}
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:46:17 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 12:03:09 GMT"
}
] | 2007-07-09T00:00:00 | [
[
"Lukose",
"Vinu",
""
],
[
"Shankar",
"R.",
""
]
] |
0706.4281 | Hugh G.R. Millington dr | Hugh G. R. Millington | Riesz integral representation theory | 33 pages | null | null | null | math.RT | null | We present a Riesz integral representation theory in which functions,
operators and measures take values in uniform commutative monoids (a
commutative monoid with a uniformity making the binary operation of the monoid
uniformly continuous). It describes the operators to which the theory can be
applied and the finitely-additive measures they generate. Operators satisfying
the conditions will be called ``Riesz integrals''. Given an underlying ``Riesz
system'', it is shown that every Riesz integral generates a certain kind of
finitely additive measure called here a ``Riesz measure''. The correspondence
between Riesz integrals and Riesz measures is a bijection.
A straightforward calculation shows that if an operator has such a
representation, then it must have the Hammerstein property. For topological
vector spaces, the theory yields necessary and sufficient conditions for
operators with the Hammerstein property to be Riesz integrals. We note that
uniform commutative monoids arise naturally when considering set-valued
functions, and that the axioms of a Riesz system rule out certain spaces of
infinitely differentiable functions.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:48:56 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Millington",
"Hugh G. R.",
""
]
] |
0706.4282 | Andrea Damascelli | S. Huefner, M.A. Hossain, A. Damascelli, G.A. Sawatzky | Two Gaps Make a High Temperature Superconductor? | Related material can be found at
http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/articles.html | Rep. Prog. Phys. 71, 062501 (2008). | 10.1088/0034-4885/71/6/062501 | null | cond-mat.supr-con cond-mat.str-el | null | One of the keys to the high-temperature superconductivity puzzle is the
identification of the energy scales associated with the emergence of a coherent
condensate of superconducting electron pairs. These might provide a measure of
the pairing strength and of the coherence of the superfluid, and ultimately
reveal the nature of the elusive pairing mechanism in the superconducting
cuprates. To this end, a great deal of effort has been devoted to investigating
the connection between the superconducting transition temperature Tc and the
normal-state pseudogap crossover temperature T*. Here we present a review of a
large body of experimental data that suggests a coexisting two-gap scenario,
i.e. superconducting gap and pseudogap, over the whole superconducting dome.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:50:23 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 21:36:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Huefner",
"S.",
""
],
[
"Hossain",
"M. A.",
""
],
[
"Damascelli",
"A.",
""
],
[
"Sawatzky",
"G. A.",
""
]
] |
0706.4283 | Garcia-Patron Sanchez | J. Sudjana, L. Magnin, R. Garcia-Patron, N. J. Cerf | Heisenberg-limited eavesdropping on the continuous-variable quantum
cryptographic protocol with no basis switching is impossible | 10 pages, 6 figures | Phys. Rev. A 76, 052301 (2007) | 10.1103/PhysRevA.76.052301 | null | quant-ph | null | The Gaussian quantum key distribution protocol based on coherent states and
heterodyne detection [Phys. Rev. Lett. 93, 170504 (2004)] has the advantage
that no active random basis switching is needed on the receiver's side. Its
security is, however, not very satisfyingly understood today because the bounds
on the secret key rate that have been derived from Heisenberg relations are not
attained by any known scheme. Here, we address the problem of the optimal
Gaussian individual attack against this protocol, and derive tight upper bounds
on the information accessible to an eavesdropper. The optical scheme achieving
this bound is also exhibited, which concludes the security analysis of this
protocol.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:51:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sudjana",
"J.",
""
],
[
"Magnin",
"L.",
""
],
[
"Garcia-Patron",
"R.",
""
],
[
"Cerf",
"N. J.",
""
]
] |
0706.4284 | Kostadin Trencevski | Kostadin Trencevski and Emilija G. Celakoska | Geodetic precession and frame dragging observed far from massive objects
and close to a gyroscope | 11 pages | Central European Journal of Physics, 9(3) (2011), 654-661 | 10.2478/s11534-010-0102-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Total precession (geodetic precession and frame dragging) depends on the
velocity of each source of gravitation, which means that it depends on the
choice of the coordinate system. We consider the latter as an anomaly
specifically in the Gravity Probe B experiment, we investigated it and solved
this anomaly. Thus, we proved that if our present expression for the geodetic
precession is correct, then the frame dragging should be 25% less than its
predicted value.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:52:40 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 07:07:55 GMT"
},
{
"version": "v3",
"created": "Sat, 15 Sep 2007 09:37:18 GMT"
},
{
"version": "v4",
"created": "Mon, 25 Nov 2013 07:59:26 GMT"
}
] | 2013-11-26T00:00:00 | [
[
"Trencevski",
"Kostadin",
""
],
[
"Celakoska",
"Emilija G.",
""
]
] |
0706.4285 | Christopher Gauthier | Ratindranath Akhoury and Christopher S. Gauthier | Decoupling of Heavy Kaluza-Klein Modes In Models With Five-Dimensional
Scalar Fields | 9 pages, no figures; sign error on equations 20, 36, 37; Added
additional references | J.Phys.G36:015005,2009 | 10.1088/0954-3899/36/1/015005 | null | hep-th | null | We investigate the decoupling of heavy Kaluza-Klein modes in $\phi^{4}$
theory and scalar QED with space-time topology $\mathbb{R}^{3,1} \times S^{1}$.
We calculate the effective action due to integrating out heavy KK modes. We
construct generalized RGE's for the couplings with respect to the
compactification scale $M$. With the solutions to the RGE's we find the
$M$-scale dependence of the effective theory due to higher dimensional quantum
effects. We find that the heavy modes decouple in $\phi^{4}$ theory, but do not
decouple in scalar QED. This is due to the zero mode of the 5-th component
$A_{5}$ of the 5-d gauge field. Because $A_{5}$ is a scalar under 4-d Lorentz
transformations, there is no gauge symmetry protecting it from getting mass and
$A_{5}^{4}$ interaction terms after loop corrections. In light of these
unpleasant features, we explore $S^{1}/\mathbb{Z}_{2}$ compactifications, which
eliminate $A_{5}$, allowing for the heavy modes to decouple at low energies. We
also explore the possibility of decoupling by including higher dimensional
operators. It is found that this is possible, but a high degree of fine tuning
is required.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:58:39 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 02:29:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Akhoury",
"Ratindranath",
""
],
[
"Gauthier",
"Christopher S.",
""
]
] |
0706.4286 | Jason Grigsby | Jason D. Grigsby and Gregory B. Cook | Measuring eccentricity in binary black-hole initial data | 12 pages, 11 figures, submitted to Physical Review D, revtex4 | Phys.Rev.D77:044011,2008 | 10.1103/PhysRevD.77.044011 | null | gr-qc | null | Initial data for evolving black-hole binaries can be constructed via many
techniques, and can represent a wide range of physical scenarios. However,
because of the way that different schemes parameterize the physical aspects of
a configuration, it is not alway clear what a given set of initial data
actually represents. This is especially important for quasiequilibrium data
constructed using the conformal thin-sandwich approach. Most initial-data
studies have focused on identifying data sets that represent binaries in
quasi-circular orbits. In this paper, we consider initial-data sets
representing equal-mass black holes binaries in eccentric orbits. We will show
that effective-potential techniques can be used to calibrate initial data for
black-hole binaries in eccentric orbits. We will also examine several different
approaches, including post-Newtonian diagnostics, for measuring the
eccentricity of an orbit. Finally, we propose the use of the ``Komar-mass
difference'' as a useful, invariant means of parameterizing the eccentricity of
relativistic orbits.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 17:59:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grigsby",
"Jason D.",
""
],
[
"Cook",
"Gregory B.",
""
]
] |
0706.4287 | Akhlesh Lakhtakia | Akhlesh Lakhtakia, John A. Polo Jr | Dyakonov-Tamm wave at the planar interface of a chiral sculptured thin
film and an isotropic dielectric material | null | J. Eur. Opt. Soc.: Rapid Pub., Vol. 2, article no. 07021, 2007 | 10.2971/jeos.2007.07021 | null | physics.optics physics.class-ph | null | Surface waves, named here as Dyakonov-Tamm waves, can exist at the planar
interface of an isotropic dielectric material and a chiral sculptured thin film
(STF). Due to the periodic nonhomogeneity of a chiral STF, the range of the
refractive index of the isotropic material is smaller but the range of the
propagation direction in the interface plane is much larger, in comparison to
those for the existence of Dyakonov waves at the planar interface of an
isotropic dielectric material and a columnar thin film.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:02:51 GMT"
}
] | 2007-07-24T00:00:00 | [
[
"Lakhtakia",
"Akhlesh",
""
],
[
"Polo",
"John A.",
"Jr"
]
] |
0706.4288 | Sheng Chen | Nan Li and Sheng Chen | On the Ring of Integer-valued Quasi-polynomials | null | null | null | null | math.NT math.RA | null | The paper studies some properties of the ring of integer-valued
quasi-polynomials. On this ring, theory of generalized Euclidean division and
generalized GCD are presented. Applications to finite simple continued fraction
expansion and Smith normal form of integral matrices with integer parameters
are also given.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:34:29 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 14:34:31 GMT"
}
] | 2007-09-20T00:00:00 | [
[
"Li",
"Nan",
""
],
[
"Chen",
"Sheng",
""
]
] |
0706.4289 | Carlos Monteserin | C. Monteserin, R.B. Barreiro, P. Vielva, E. Martinez-Gonzalez, M.P.
Hobson, A.N. Lasenby | A low CMB variance in the WMAP data | 13 pages, 5 figures. Some new tests added. Section 5 largely
modified. Accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.387:209-219,2008 | 10.1111/j.1365-2966.2008.13149.x | null | astro-ph | null | We have estimated the CMB variance from the three-year WMAP data, finding a
value which is significantly lower than the one expected from Gaussian
simulations using the WMAP best-fit cosmological model, at a significance level
of 98.7 per cent. This result is even more prominent if we consider only the
north ecliptic hemisphere (99.8 per cent). Different analyses have been
performed in order to identify a possible origin for this anomaly. In
particular we have studied the behaviour of single radiometers and single year
data as well as the effect of residual foregrounds and 1/f noise, finding that
none of these possibilities can explain the low value of the variance. We have
also tested the effect of varying the cosmological parameters, finding that the
estimated CMB variance tends to favour higher values of $n_s$ than the one of
the WMAP best-fit model. In addition, we have also tested the consistency
between the estimated CMB variance and the actual measured CMB power spectrum
of the WMAP data, finding a strong discrepancy. A possible interpretation of
this result could be a deviation from Gaussianity and/or isotropy of the CMB.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:08:20 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Mar 2008 13:30:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Monteserin",
"C.",
""
],
[
"Barreiro",
"R. B.",
""
],
[
"Vielva",
"P.",
""
],
[
"Martinez-Gonzalez",
"E.",
""
],
[
"Hobson",
"M. P.",
""
],
[
"Lasenby",
"A. N.",
""
]
] |
0706.4290 | Li-Sheng Tseng | Melanie Becker, Li-Sheng Tseng, Shing-Tung Yau | Heterotic Kahler/non-Kahler Transitions | 17 pages, harvmac | Adv. Theor. Math. Phys. 12 (2008) 1147-1162 | null | null | hep-th | null | We show how two topologically distinct spaces - the Kahler K3 x T^2 and the
non-Kahler T^2 bundle over K3 - can be smoothly connected in heterotic string
theory. The transition occurs when the base K3 is deformed to the T^4/Z_2
orbifold limit. The orbifold theory can be mapped via duality to M-theory on K3
x K3 where the transition corresponds to an exchange of the two K3's.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:19:48 GMT"
}
] | 2014-02-10T00:00:00 | [
[
"Becker",
"Melanie",
""
],
[
"Tseng",
"Li-Sheng",
""
],
[
"Yau",
"Shing-Tung",
""
]
] |
0706.4291 | Michael Widom | M. Widom, J. Lidmar and D. R. Nelson | Soft modes near the buckling transition of icosahedral shells | 28 pages, 6 figures | null | 10.1103/PhysRevE.76.031911 | null | physics.bio-ph | null | Icosahedral shells undergo a buckling transition as the ratio of Young's
modulus to bending stiffness increases. Strong bending stiffness favors smooth,
nearly spherical shapes, while weak bending stiffness leads to a sharply
faceted icosahedral shape. Based on the phonon spectrum of a simplified
mass-and-spring model of the shell, we interpret the transition from smooth to
faceted as a soft-mode transition. In contrast to the case of a disclinated
planar network where the transition is sharply defined, the mean curvature of
the sphere smooths the transitition. We define elastic susceptibilities as the
response to forces applied at vertices, edges and faces of an icosahedron. At
the soft-mode transition the vertex susceptibility is the largest, but as the
shell becomes more faceted the edge and face susceptibilities greatly exceed
the vertex susceptibility. Limiting behaviors of the susceptibilities are
analyzed and related to the ridge-scaling behavior of elastic sheets. Our
results apply to virus capsids, liposomes with crystalline order and other
shell-like structures with icosahedral symmetry.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:21:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Widom",
"M.",
""
],
[
"Lidmar",
"J.",
""
],
[
"Nelson",
"D. R.",
""
]
] |
0706.4292 | Chengju Wang | Chengju Wang and Richard M. Stratt | Global perspectives on the energy landscapes of liquids, supercooled
liquids, and glassy systems: The potential energy landscape ensemble | 43 pages, 7 figures | J. Chem. Phys. 127, 224503(2007) | 10.1063/1.2801994 | null | cond-mat.soft cond-mat.stat-mech | null | In principle, all of the dynamical complexities of many-body systems are
encapsulated in the potential energy landscapes on which the atoms move - an
observation that suggests that the essentials of the dynamics ought to be
determined by the geometry of those landscapes. But what are the principal
geometric features that control the long-time dynamics? We suggest that the key
lies not in the local minima and saddles of the landscape, but in a more global
property of the surface: its accessible pathways. In order to make this notion
more precise we introduce two ideas: (1) a switch to a new ensemble that
removes the concept of potential barriers from the problem, and (2) a way of
finding optimum pathways within this new ensemble. The potential energy
landscape ensemble, which we describe in the current paper, regards the maximum
accessible potential energy, rather than the temperature, as a control
variable. We show here that while this approach is thermodynamically equivalent
to the canonical ensemble, it not only sidesteps the idea of barriers, it
allows us to be quantitative about the connectivity of a landscape. We
illustrate these ideas with calculations on a simple atomic liquid and on the
Kob-Andersen model of a glass-forming liquid, showing, in the process, that the
landscape of the Kob-Anderson model appears to have a connectivity transition
at the landscape energy associated with its mode-coupling transition. We turn
to the problem of finding the most efficient pathways through potential energy
landscapes in our companion paper.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:23:32 GMT"
}
] | 2007-12-12T00:00:00 | [
[
"Wang",
"Chengju",
""
],
[
"Stratt",
"Richard M.",
""
]
] |
0706.4293 | Huaiyu Duan | Huaiyu Duan (UCSD), George M. Fuller (UCSD) and Yong-Zhong Qian (UMN) | Simple Picture for Neutrino Flavor Transformation in Supernovae | 11 pages, 2 figure, retex4 format. Split fig.1 into two figures.
Minor corrections. Version accepted by PRD | Phys.Rev.D76:085013,2007 | 10.1103/PhysRevD.76.085013 | null | astro-ph hep-ph | null | We can understand many recently-discovered features of flavor evolution in
dense, self-coupled supernova neutrino and antineutrino systems with a simple,
physical scheme consisting of two quasi-static solutions. One solution closely
resembles the conventional, adiabatic single neutrino
Mikheyev-Smirnov-Wolfenstein (MSW) mechanism, in that neutrinos and
antineutrinos remain in mass eigenstates as they evolve in flavor space. The
other solution is analogous to the regular precession of a gyroscopic pendulum
in flavor space, and has been discussed extensively in recent works. Results of
recent numerical studies are best explained with combinations of these
solutions in the following general scenario: (1) Near the neutrino sphere, the
MSW-like many-body solution obtains. (2) Depending on neutrino vacuum mixing
parameters, luminosities, energy spectra, and the matter density profile,
collective flavor transformation in the nutation mode develops and drives
neutrinos away from the MSW-like evolution and toward regular precession. (3)
Neutrino and antineutrino flavors roughly evolve according to the regular
precession solution until neutrino densities are low. In the late stage of the
precession solution, a stepwise swapping develops in the energy spectra of
$\nu_e$ and $\nu_\mu/\nu_\tau$. We also discuss some subtle points regards
adiabaticity in flavor transformation in dense neutrino systems.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:23:47 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Oct 2007 18:18:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Duan",
"Huaiyu",
"",
"UCSD"
],
[
"Fuller",
"George M.",
"",
"UCSD"
],
[
"Qian",
"Yong-Zhong",
"",
"UMN"
]
] |
0706.4294 | Terry Sloan | T.Sloan, A W Wolfendale | Cosmic Rays and Global Warming | Submitted to ICRC 2007 | null | null | null | astro-ph physics.ao-ph physics.geo-ph physics.soc-ph | null | It has been claimed by others that observed temporal correlations of
terrestrial cloud cover with `the cosmic ray intensity' are causal. The
possibility arises, therefore, of a connection between cosmic rays and Global
Warming. If true, the implications would be very great. We have examined this
claim to look for evidence to corroborate it. So far we have not found any and
so our tentative conclusions are to doubt it. Such correlations as appear are
more likely to be due to the small variations in solar irradiance, which, of
course, correlate with cosmic rays. We estimate that less than 15% of the
11-year cycle warming variations are due to cosmic rays and less than 2% of the
warming over the last 35 years is due to this cause.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:23:47 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Sloan",
"T.",
""
],
[
"Wolfendale",
"A W",
""
]
] |
0706.4295 | Chengju Wang | Chengju Wang and Richard M. Stratt | Global perspectives on the energy landscapes of liquids, supercooled
liquids, and glassy systems: Geodesic pathways through the potential energy
landscape | 50 pages, 9 figures | J. Chem. Phys. 127, 224504 (2007) | 10.1063/1.2801995 | null | cond-mat.soft cond-mat.stat-mech | null | How useful it is to think about the potential energy landscape of a complex
many-body system depends in large measure on how direct the connection is to
the system's dynamics. In this paper we show that, within what we call the
potential energy landscape ensemble, it is possible to make direct connections
between the geometry of the landscape and the long-time dynamical behaviors of
systems such as supercooled liquids. We show, in particular, that the onset of
slow dynamics in such systems is governed directly by the lengths of their
geodesics - the shortest paths through their landscapes within the special
ensemble. The more convoluted and labyrinthine these geodesics are, the slower
that dynamics is. Geodesics in the landscape ensemble have sufficiently
well-defined characteristics that is straightforward to search for them
numerically, a point we illustrate by computing the geodesic lengths for an
ordinary atomic liquid and a binary glass-forming atomic mixture. We find that
the temperature dependence of the diffusion constants of these systems,
including the precipitous drop as the glass-forming system approaches its
mode-coupling transition, is predicted quantitatively by the growth of the
geodesic path lengths.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:33:52 GMT"
}
] | 2007-12-12T00:00:00 | [
[
"Wang",
"Chengju",
""
],
[
"Stratt",
"Richard M.",
""
]
] |
0706.4296 | Martin Chuaqui S | Martin Chuaqui, Peter Duren, and Brad Osgood | Schwarzian Derivatives and Uniform Local Univalence | null | null | null | null | math.CV | null | Quantitative estimates are obtained for the (finite) valence of functions
analytic in the unit disk with Schwarzian derivative that is bounded or of slow
growth. A harmonic mapping is shown to be uniformly locally univalent with
respect to the hyperbolic metric if and only if it has finite Schwarzian norm,
thus generalizing a result of B. Schwarz for analytic functions. A numerical
bound is obtained for the Schwarzian norms of univalent harmonic mappings.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:42:56 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jul 2007 18:08:57 GMT"
}
] | 2007-07-16T00:00:00 | [
[
"Chuaqui",
"Martin",
""
],
[
"Duren",
"Peter",
""
],
[
"Osgood",
"Brad",
""
]
] |
0706.4297 | Ignace Loris | I. Daubechies, M. Fornasier, I. Loris | Accelerated Projected Gradient Method for Linear Inverse Problems with
Sparsity Constraints | 24 pages, 5 figures. v2: added reference, some amendments, 27 pages | null | 10.1007/s00041-008-9039-8 | null | math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Regularization of ill-posed linear inverse problems via $\ell_1$ penalization
has been proposed for cases where the solution is known to be (almost) sparse.
One way to obtain the minimizer of such an $\ell_1$ penalized functional is via
an iterative soft-thresholding algorithm. We propose an alternative
implementation to $\ell_1$-constraints, using a gradient method, with
projection on $\ell_1$-balls. The corresponding algorithm uses again iterative
soft-thresholding, now with a variable thresholding parameter. We also propose
accelerated versions of this iterative method, using ingredients of the
(linear) steepest descent method. We prove convergence in norm for one of these
projected gradient methods, without and with acceleration.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:44:37 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Aug 2008 15:31:25 GMT"
}
] | 2013-01-01T00:00:00 | [
[
"Daubechies",
"I.",
""
],
[
"Fornasier",
"M.",
""
],
[
"Loris",
"I.",
""
]
] |
0706.4298 | Christian Boulinier | Christian Boulinier (LaRIA) | Unison as a Self-Stabilizing Wave Stream Algorithm in Asynchronous
Anonymous Networks | null | Rapport de recherche. (28/06/2007) | null | null | cs.DC | null | How to pass from local to global scales in anonymous networks? How to
organize a selfstabilizing propagation of information with feedback. From the
Angluin impossibility results, we cannot elect a leader in a general anonymous
network. Thus, it is impossible to build a rooted spanning tree. Many problems
can only be solved by probabilistic methods. In this paper we show how to use
Unison to design a self-stabilizing barrier synchronization in an anonymous
network. We show that the commuication structure of this barrier
synchronization designs a self-stabilizing wave-stream, or pipelining wave, in
anonymous networks. We introduce two variants of Wave: the strong waves and the
wavelets. A strong wave can be used to solve the idempotent r-operator
parametrized computation problem. A wavelet deals with k-distance computation.
We show how to use Unison to design a self-stabilizing wave stream, a
self-stabilizing strong wave stream and a self-stabilizing wavelet stream.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:51:36 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Boulinier",
"Christian",
"",
"LaRIA"
]
] |
0706.4299 | Peter W. Michor | Peter W. Michor, David Mumford, Jayant Shah, Laurent Younes | A Metric on Shape Space with Explicit Geodesics | 31 pages, some typos corrected | Rend. Lincei Mat. Appl. 9 (2008) 25-57 | null | null | math.DG math.AP | null | This paper studies a specific metric on plane curves that has the property of
being isometric to classical manifold (sphere, complex projective, Stiefel,
Grassmann) modulo change of parametrization, each of these classical manifolds
being associated to specific qualifications of the space of curves
(closed-open, modulo rotation etc...) Using these isometries, we are able to
explicitely describe the geodesics, first in the parametric case, then by
modding out the paremetrization and considering horizontal vectors. We also
compute the sectional curvature for these spaces, and show, in particular, that
the space of closed curves modulo rotation and change of parameter has positive
curvature. Experimental results that explicitly compute minimizing geodesics
between two closed curves are finally provided
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:48:10 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 12:35:55 GMT"
}
] | 2008-05-05T00:00:00 | [
[
"Michor",
"Peter W.",
""
],
[
"Mumford",
"David",
""
],
[
"Shah",
"Jayant",
""
],
[
"Younes",
"Laurent",
""
]
] |
0706.4300 | Akhlesh Lakhtakia | Akhlesh Lakhtakia, John A. Polo Jr | Morphological influence on surface--wave propagation at the planar
interface of a metal film and a columnar thin film | null | null | null | null | physics.optics physics.class-ph | null | The selection of a higher vapor deposition angle when growing a columnar thin
film (CTF) leads to surface-wave propagation at a planar metal-CTF interface
with phase velocity of lower magnitude and shorter propagation range.
Acordingly, a higher angle of plane-wave incidence is required to excite that
surface wave in a modified Kretschmann configuration.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 18:59:52 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Lakhtakia",
"Akhlesh",
""
],
[
"Polo",
"John A.",
"Jr"
]
] |
0706.4301 | Keith Thorne | K. A. Thorne (for the LIGO Scientific Collaboration) | Searching for Gravitational-Wave Bursts with LIGO | 9 pages, 3 figures, for the Proceedings of the Recontres de Moriond:
Gravitational Waves and Experimental Gravity (March 11-18, 2007) | null | null | LIGO-P070062-03 | gr-qc | null | We present recent results from searches by the LIGO Science Collaboration for
bursts of gravitational-wave radiation, as well as the status of other ongoing
searches. These include directed searches for bursts associated with observed
sources (gamma-ray bursts, soft gamma repeaters) and untriggered searches for
bursts from unknown sources. We also present the status of some newer
investigations, such as coherent network methods. We show methods for
interpreting our search results in terms of astrophysical source distributions
that improve their accessibility to the wider community.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:13:29 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Thorne",
"K. A.",
"",
"for the LIGO Scientific Collaboration"
]
] |
0706.4302 | D. C. Schmadel | Geoffry Evans, D. C. Schmadel, A. B. Sushkov, H. D. Drew | Silicon beamsplitter for Fourier transform spectroscopy at far infrared
frequencies | 3 pages, 5 figures, minor changes | null | null | null | physics.ins-det physics.optics | null | We report the performance of a silicon wafer beamsplitter for use for low
$\Delta\nu>0.3 cm^{-1}$ resolution Fourier transform spectroscopy at far
infrared frequencies. We characterize the Si beamsplitter by comparing
throughput spectra measured with it to those measured with the standard Mylar
beamsplitters commonly used in that range. We find that the throughput of the
silicon beamsplitter is substantially greater than that of the Mylar
beamsplitters over most of the IR spectrum, and that they are comparable in
some limited ranges. The 2 mm silicon beamsplitter has an etalon spacing of
about 0.7 cm^{-1}, which interferes with its use for $0.1 cm^{-1}<\Delta\nu <
0.3cm^{-1}$. The average efficiency of the Si beamsplitter is 0.37 compared
with a maximum efficiency of 0.35 for Mylar. The Si is particularly more
efficient in the 100 to 400 cm^{-1} range because of absorption in Mylar.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:18:26 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jul 2007 17:51:25 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Evans",
"Geoffry",
""
],
[
"Schmadel",
"D. C.",
""
],
[
"Sushkov",
"A. B.",
""
],
[
"Drew",
"H. D.",
""
]
] |
0706.4303 | Patrick Christopher Fragile | P. Chris Fragile, Omer M. Blaes, Peter Anninos, Jay D. Salmonson | Global General Relativistic MHD Simulation of a Tilted Black-Hole
Accretion Disk | Accepted to ApJ. 32 pages, 16 fig. Please see
http://www.cofc.edu/~fragilep/tilted.html for movies and high-resolution
figures | null | 10.1086/521092 | null | astro-ph | null | This paper presents a continuation of our efforts to numerically study
accretion disks that are misaligned (tilted) with respect to the rotation axis
of a Kerr black hole. Here we present results of a global numerical simulation
which fully incorporates the effects of the black hole spacetime as well as
magnetorotational turbulence that is the primary source of angular momentum
transport in the flow. This simulation shows dramatic differences from
comparable simulations of untilted disks. Accretion onto the hole occurs
predominantly through two opposing plunging streams that start from high
latitudes with respect to both the black-hole and disk midplanes. This is due
to the aspherical nature of the gravitational spacetime around the rotating
black hole. These plunging streams start from a larger radius than would be
expected for an untilted disk. In this regard the tilted black hole effectively
acts like an untilted black hole of lesser spin. Throughout the duration of the
simulation, the main body of the disk remains tilted with respect to the
symmetry plane of the black hole; thus there is no indication of a
Bardeen-Petterson effect in the disk at large. The torque of the black hole
instead principally causes a global precession of the main disk body. In this
simulation the precession has a frequency of $3 (M_\odot/M)$ Hz, a value
consistent with many observed low-frequency quasi-periodic oscillations.
However, this value is strongly dependent on the size of the disk, so this
frequency may be expected to vary over a large range.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:15:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fragile",
"P. Chris",
""
],
[
"Blaes",
"Omer M.",
""
],
[
"Anninos",
"Peter",
""
],
[
"Salmonson",
"Jay D.",
""
]
] |
0706.4304 | Petr Vogel | V. A. Rodin, Amand Faessler, F. \v{S}imkovic, and Petr Vogel | Erratum: Assessment of uncertainties in QRPA $0\nu\beta\beta$-decay
nuclear matrix elements [Nucl. Phys. A 766, 107 (2006)] | Accepted for publication in Nucl. Phys. A, see also nucl-th/0503063 | Nucl.Phys.A766:107-131,2006; Erratum-ibid.A793:213-215,2007 | 10.1016/j.nuclphysa.2005.12.004 | null | nucl-th hep-ph | null | This is an erratum to our previously published paper.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:35:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Rodin",
"V. A.",
""
],
[
"Faessler",
"Amand",
""
],
[
"Šimkovic",
"F.",
""
],
[
"Vogel",
"Petr",
""
]
] |
0706.4305 | Franciszek Szafraniec | F.H. Szafraniec | Moments from their very truncations | to appear in Contemporary Mathematics, Proc. 5th Conference on
Function Spaces, May 16-20, 2006, Southern Illinois University, Edwardsville,
Illinois; ed. Krzysztof Jarosz | null | null | null | math.FA math.CA | null | It is known that positive definiteness is not enough for the multidimensional
moment problem to be solved. We would like throw in to the garden of existing
in this matter so far results one more, a result which takes into
considerations the utmost possible truncations.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:41:48 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Szafraniec",
"F. H.",
""
]
] |
0706.4306 | Markus Reineke | Johannes Engel, Markus Reineke | Smooth models of quiver moduli | 37 pages, notations and typo corrected, references updated, new
examples | null | null | null | math.RT math.AG math.CO | null | For any moduli space of stable representations of quivers, certain smooth
varieties, compactifying projective space fibrations over the moduli space, are
constructed. The boundary of this compactification is analyzed. Explicit
formulas for the Betti numbers of the smooth models are derived. In the case of
moduli of simple representations, explicit cell decompositions of the smooth
models are constructed.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:42:24 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Mar 2008 10:00:32 GMT"
}
] | 2009-04-16T00:00:00 | [
[
"Engel",
"Johannes",
""
],
[
"Reineke",
"Markus",
""
]
] |
0706.4307 | Steven Gubser | Steven S. Gubser, Silviu S. Pufu, and Amos Yarom | Sonic booms and diffusion wakes generated by a heavy quark in thermal
AdS/CFT | 4 pages, 1 figure, revtex4 | Phys.Rev.Lett.100:012301,2008 | 10.1103/PhysRevLett.100.012301 | PUPT-2239, LMU-ASC 42/07 | hep-th hep-ph nucl-th | null | We evaluate the Poynting vector generated by a heavy quark moving through a
thermal state of N=4 gauge theory using AdS/CFT. A significant diffusion wake
is observed as well as a Mach cone. We discuss the ratio of the energy going
into sound modes to the energy coming in from the wake.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:46:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gubser",
"Steven S.",
""
],
[
"Pufu",
"Silviu S.",
""
],
[
"Yarom",
"Amos",
""
]
] |
0706.4308 | Pavel Etingof | Pavel Etingof | Reducibility of the polynomial representation of the degenerate double
affine Hecke algebra | 7 pages, latex | null | null | null | math.QA math.RT | null | In this note we determine the values of parameters c for which the polynomial
representation of the degenerate double affine Hecke algebra (DAHA), i.e. the
trigonometric Cherednik algebra, is reducible. Namely, we show that c is a
reducibility point for the polynomial representation of the trigonometric
Cherednik algebra for a root system R if and only if it is a reducibility point
for the rational Cherednik algebra for the Weyl group of some root subsystem R'
of R of the same rank; such subsystems for any R are given by the well known
Borel-de Siebenthal algorithm. This result has been proved by Cherednik using a
case-by-case method.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:55:10 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Etingof",
"Pavel",
""
]
] |
0706.4309 | David Gherson | David Gherson | Constraints on the extra dimension from KK gravitino decay | 4 pages, 2 figures, Contributed to 42st Rencontres de Moriond on
Electroweak Interactions and Unified Theories, La Thuile, Aosta Valley,
Italy, March 2007 | null | null | null | hep-ph | null | We study the consequences of the gravitino decay into dark matter. We suppose
that the lightest neutralino is the main component of dark matter. In our
framework gravitino is heavy enough to decay before Big Bang Nucleosynthesis
starts. We consider a model coming from a five dimensional supergravity
compactified on $S^1/Z_2$ with gravity in the bulk and matter localized on
tensionless branes at the orbifold fixed points. We require that the dark
matter, which is produced thermally and in the decay of Kaluza-Klein modes of
gravitino, has an abundance compatible with observation. We deduce from our
model that there are curves of constraints between the size of the
extra-dimension and the reheating temperature of the universe after inflation.
This talk is based on hep-ph/0702183 to be published in \PRD.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 19:58:28 GMT"
}
] | 2007-06-29T00:00:00 | [
[
"Gherson",
"David",
""
]
] |
0706.4310 | Sergei Isakov | Sergei V. Isakov, Arun Paramekanti, Yong Baek Kim | Exotic phase diagram of a cluster charging model of bosons on the kagome
lattice | 11 pages, 10 figures, long version of cond-mat/0607778 | Phys. Rev. B 76, 224431 (2007) | 10.1103/PhysRevB.76.224431 | null | cond-mat.str-el | null | We study a model of hard-core bosons on the kagome lattice with short-range
hopping ($t$) and repulsive interactions ($V$). This model directly maps on to
an easy-axis $S=1/2$ XXZ model on the kagome lattice and is also related, at
large $V/t$, to a quantum dimer model on the triangular lattice. Using quantum
Monte Carlo (QMC) numerics, we map out the phase diagram of this model at
half-filling. At T=0, we show that this model exhibits a superfluid phase at
small $V/t$ and an insulating phase at large $V/t$, separated by a continuous
quantum phase transition at $V_c/t \approx 19.8$. The insulating phase at T=0
appears to have no conventional broken symmetries, and is thus a uniform Mott
insulator (a `spin liquid' in magnetic language). We characterize this
insulating phase as a uniform $Z_2$ fractionalized insulator from the
topological order in the ground state and estimate its vison gap. Consistent
with this identification, there is no apparent thermal phase transition upon
heating the insulator. The insulating phase instead smoothly crosses over into
the high temperature paramagnet via an intermediate cooperative paramagnetic
regime. We also study the superfluid-to-normal thermal transition for $V <
V_c$. We find that this is a Kosterlitz-Thouless transition at small $V/t$ but
changes to a first order transition for $V$ closer to $V_c$. We argue that this
first order thermal transition is consistent with the presence of a nearby
$Z_2$ insulating ground state obtained from the superfluid ground state by
condensing double vortices.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 20:00:03 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jul 2007 19:50:42 GMT"
}
] | 2008-03-08T00:00:00 | [
[
"Isakov",
"Sergei V.",
""
],
[
"Paramekanti",
"Arun",
""
],
[
"Kim",
"Yong Baek",
""
]
] |
0706.4311 | Gabriel Shaughnessy | Vernon Barger, Paul Langacker, Mathew McCaskey, Michael J.
Ramsey-Musolf and Gabe Shaughnessy | LHC Phenomenology of an Extended Standard Model with a Real Scalar
Singlet | 39 pages, 11 figures, 2 tables | Phys.Rev.D77:035005,2008 | 10.1103/PhysRevD.77.035005 | MAD-PH-07-1492 | hep-ph | null | Gauge singlet extensions of the Standard Model (SM) scalar sector may help
remedy its theoretical and phenomenological shortcomings while solving
outstanding problems in cosmology. Depending on the symmetries of the scalar
potential, such extensions may provide a viable candidate for the observed
relic density of cold dark matter or a strong first order electroweak phase
transition needed for electroweak baryogenesis. Using the simplest extension of
the SM scalar sector with one real singlet field, we analyze the generic
implications of a singlet-extended scalar sector for Higgs boson phenomenology
at the Large Hadron Collider (LHC). We consider two broad scenarios: one in
which the neutral SM Higgs and singlet mix and the other in which no mixing
occurs and the singlet can be a dark matter particle. For the first scenario,
we analyze constraints from electroweak precision observables and their
implications for LHC Higgs phenomenology. For models in which the singlet is
stable, we determine the conditions under which it can yield the observed relic
density, compute the cross sections for direct detection in recoil experiments,
and discuss the corresponding signatures at the LHC.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 20:06:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Barger",
"Vernon",
""
],
[
"Langacker",
"Paul",
""
],
[
"McCaskey",
"Mathew",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Shaughnessy",
"Gabe",
""
]
] |
0706.4312 | Jeremy Sepinsky | J. F. Sepinsky, B. Willems, V. Kalogera, F. A. Rasio | Interacting Binaries with Eccentric Orbits. Secular Orbital Evolution
Due To Conservative Mass Transfer | 16 pages, 8 figures, Accepted by The Astrophysical Journal | null | 10.1086/520911 | null | astro-ph | null | We investigate the secular evolution of the orbital semi-major axis and
eccentricity due to mass transfer in eccentric binaries, assuming conservation
of total system mass and orbital angular momentum. Assuming a delta function
mass transfer rate centered at periastron, we find rates of secular change of
the orbital semi-major axis and eccentricity which are linearly proportional to
the magnitude of the mass transfer rate at periastron. The rates can be
positive as well as negative, so that the semi-major axis and eccentricity can
increase as well as decrease in time. Adopting a delta-function mass-transfer
rate of $10^{-9} M_\sun {\rm yr}^{-1}$ at periastron yields orbital evolution
timescales ranging from a few Myr to a Hubble time or more, depending on the
binary mass ratio and orbital eccentricity. Comparison with orbital evolution
timescales due to dissipative tides furthermore shows that tides cannot, in all
cases, circularize the orbit rapidly enough to justify the often adopted
assumption of instantaneous circularization at the onset of mass transfer. The
formalism presented can be incorporated in binary evolution and population
synthesis codes to create a self-consistent treatment of mass transfer in
eccentric binaries.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 20:01:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sepinsky",
"J. F.",
""
],
[
"Willems",
"B.",
""
],
[
"Kalogera",
"V.",
""
],
[
"Rasio",
"F. A.",
""
]
] |
0706.4313 | Aneesh Manohar | Elizabeth Jenkins and Aneesh V. Manohar | Rephasing Invariants of Quark and Lepton Mixing Matrices | Some references added, and typos corrected | Nucl.Phys.B792:187-205,2008 | 10.1016/j.nuclphysb.2007.09.031 | null | hep-ph | null | Rephasing invariants of quark and lepton mixing matrices are obtained in the
standard model extended by the seesaw mechanism, and in its low-energy
effective theory with the dimension-five Majorana mass operator. We classify
the basic invariants, discuss non-trivial relations between them, and determine
the independent invariants which characterize all the information in the mixing
matrices in a basis-independent way. We also discuss the restrictions on the
allowed ranges for the mixing phases, and on the rephasing invariants, which
follow from a discrete invariance of the Majorana mass matrix.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 20:13:53 GMT"
},
{
"version": "v2",
"created": "Wed, 14 Nov 2007 17:36:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jenkins",
"Elizabeth",
""
],
[
"Manohar",
"Aneesh V.",
""
]
] |
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