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802.0103 | Tsutomu Kobayashi | Tsutomu Kobayashi, Tetsuya Shiromizu, Claudia de Rham | Curvature corrections to the low energy effective theory in 6D
regularized braneworlds | 14 pages | Phys.Rev.D77:124012,2008 | 10.1103/PhysRevD.77.124012 | WU-AP/278/08 | hep-th astro-ph gr-qc | null | We study the effective gravitational theory on a brane in a six-dimensional
Einstein-Maxwell model of flux compactification, regularizing a conical defect
as a codimension-one brane. We employ the gradient expansion technique valid at
low energies. A lowest order analysis showed that standard four-dimensional
Einstein gravity is reproduced on the brane. We extend this study to include
second order corrections in the effective equations, and show that the
correction term is given by a quadratic energy-momentum tensor. Taking the
thin-brane limit where the regularized brane shrinks to the pole, we find that
the second order metric diverges logarithmically on the brane, giving rise to
divergences in the brane effective action. Away from the branes, the effective
action is however well-defined.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 11:58:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kobayashi",
"Tsutomu",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"de Rham",
"Claudia",
""
]
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802.0104 | Masatoshi Suzuki | Masatoshi Suzuki, Lin Weng | Zeta functions for $G_2$ and their zeros | 43 pages | null | null | null | math.NT math.RT | null | The exceptional group $G_2$ has two maximal parabolic subgroups $P_{long}$,
$P_{short}$ corresponding to the so-called long root and short root. In this
paper, the second author introduces two zeta functions associated to
$(G_2,P_{long})$ and $(G_2,P_{short})$ respectively, and the first author
proves that these zetas satisfy the Riemann Hypothesis.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 11:59:36 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Mar 2008 05:23:38 GMT"
}
] | 2008-03-11T00:00:00 | [
[
"Suzuki",
"Masatoshi",
""
],
[
"Weng",
"Lin",
""
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802.0105 | Takayuki Mizuno | Takayuki Mizuno | Power Law of Customers' Expenditures in Convenience Stores | 9 pages, 5 figures. Accepted for publication in Journal of the
Physical Society of Japan Vol.77No.3 | null | 10.1143/JPSJ.77.035001 | null | physics.soc-ph | null | In a convenience store chain, a tail of the cumulative density function of
the expenditure of a person during a single shopping trip follows a power law
with an exponent of -2.5. The exponent is independent of the location of the
store, the shopper's age, the day of week, and the time of day.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 12:01:07 GMT"
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"Mizuno",
"Takayuki",
""
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-0.0278230291,
0.1137907207,
-0.0319353193,
0.0415913947,
0.0514036305,
0.0143409623,
-0.0157464296,
0.0642870739,
0.1186838299,
-0.1081688553,
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-0.038884569,
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-0.0436735675,
-0.078133516,
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] |
802.0106 | Zakaria Merebashvili | J. G. K\"orner, Z. Merebashvili and M. Rogal | Next-to-next-to-leading order ${\cal O}(\alpha_s^4)$ results for heavy
quark pair production in quark--antiquark collisions: The one-loop squared
contributions | 12 pages, 2 figures, electronic results file, abbreviation NNLO in
Title and Abstract expanded, Summary expanded, reference updated, version to
appear in Phys.Rev.D | Phys.Rev.D77:094011,2008 | 10.1103/PhysRevD.77.094011 | DESY 08-008; MZ-TH/08-05 | hep-ph | null | We calculate the next-to-next-to-leading order ${\cal O}(\alpha_s^4)$
one-loop squared corrections to the production of heavy quark pairs in
quark-antiquark annihilations. These are part of the next-to-next-to-leading
order ${\cal O}(\alpha_s^4)$ radiative QCD corrections to this process. Our
results, with the full mass dependence retained, are presented in a closed and
very compact form, in the dimensional regularization scheme. We have found very
intriguing factorization properties for the finite part of the amplitudes.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:10:43 GMT"
},
{
"version": "v2",
"created": "Mon, 19 May 2008 17:55:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Körner",
"J. G.",
""
],
[
"Merebashvili",
"Z.",
""
],
[
"Rogal",
"M.",
""
]
] | [
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] |
802.0107 | Lu\'is Gargat\'e | L. Gargat\'e, R. Bingham, R. A. Fonseca, R. Bamford, A. Thornton, K.
Gibson, J. Bradford, L. O. Silva | Hybrid simulations of mini-magnetospheres in the laboratory | null | null | 10.1088/0741-3335/50/7/074017 | null | physics.space-ph physics.plasm-ph | null | Solar energetic ions are a known hazard to both spacecraft electronics and to
manned space flights in interplanetary space missions that extend over a long
period of time. A dipole-like magnetic field and a plasma source, forming a
mini magnetosphere, are being tested in the laboratory as means of protection
against such hazards. We investigate, via particle-in-cell hybrid simulations,
using kinetic ions and fluid electrons, the characteristics of the mini
magnetospheres. Our results, for parameters identical to the experimental
conditions, reveal the formation of a mini-magnetosphere, whose features are
scanned with respect to the plasma density, the plasma flow velocity, and the
intensity of the dipole field. Comparisons with a simplified theoretical model
reveal a good qualitative agreement and excellent quantitative agreement for
higher plasma dynamic pressures and lower B-fields.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 12:12:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gargaté",
"L.",
""
],
[
"Bingham",
"R.",
""
],
[
"Fonseca",
"R. A.",
""
],
[
"Bamford",
"R.",
""
],
[
"Thornton",
"A.",
""
],
[
"Gibson",
"K.",
""
],
[
"Bradford",
"J.",
""
],
[
"Silva",
"L. O.",
""
]
] | [
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] |
802.0108 | Jonas Kiessling | Jonas Kiessling | Properties of cellular classes of chain complexes | 16 pages, references added, corrected typos | null | null | null | math.AT math.AC | null | In this paper we prove certain properties of cellular and acyclic classes of
chain complexes of modules over a commutative Noetherian ring. In particular we
show that if X is finite and belongs to some cellular class C then \Sigma^n H_X
also belongs to C, for every n.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 12:43:58 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 15:55:33 GMT"
}
] | 2008-03-19T00:00:00 | [
[
"Kiessling",
"Jonas",
""
]
] | [
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] |
802.0109 | B Reville | B. Reville, S. O'Sullivan, P. Duffy, J.G. Kirk | The transport of cosmic rays in self-excited magnetic turbulence | 8 pages, 8 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13059.x | null | astro-ph | null | The process of diffusive shock acceleration relies on the efficacy with which
hydromagnetic waves can scatter charged particles in the precursor of a shock.
The growth of self-generated waves is driven by both resonant and non-resonant
processes. We perform high-resolution magnetohydrodynamic simulations of the
non-resonant cosmic-ray driven instability, in which the unstable waves are
excited beyond the linear regime. In a snapshot of the resultant field,
particle transport simulations are carried out. The use of a static snapshot of
the field is reasonable given that the Larmor period for particles is typically
very short relative to the instability growth time. The diffusion rate is found
to be close to, or below, the Bohm limit for a range of energies. This provides
the first explicit demonstration that self-excited turbulence reduces the
diffusion coefficient and has important implications for cosmic ray transport
and acceleration in supernova remnants.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 12:36:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Reville",
"B.",
""
],
[
"O'Sullivan",
"S.",
""
],
[
"Duffy",
"P.",
""
],
[
"Kirk",
"J. G.",
""
]
] | [
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] |
802.011 | Maria Lu\'isa Arruda | Lu\'isa Arruda, Fernando Bar\~ao, Jo\~ao Borges, Fernando Carmo,
Patr\'icia Gon\c{c}alves, M\'ario Pimenta | Velocity and charge reconstruction with the AMS/RICH detector | 5 pages, 3 figures. Contribution to the 5th International Workshop
New Worlds in Astroparticle Physics (Faro, Portugal 2005). Presenter: Luisa
Arruda | Proceedings of the 5th International Workshop New Worlds in
Astroparticle Physics (Faro, Portugal 2005), p. 134-139, World Scientific | null | null | astro-ph | null | The Alpha Magnetic Spectrometer (AMS), to be installed on the International
Space Station (ISS) in 2008, will be equipped with a proximity focusing Ring
Imaging CHerenkov detector (RICH). This detector will be equipped with a dual
radiator (aerogel+NaF), a lateral conical mirror and a detection plane made of
680 photomultipliers and light-guides, enabling measurements of particle
electric charge and velocity. A likelihood method for the Cherenkov angle
reconstruction was applied leading to a velocity determination for protons with
a resolution around 0.1%. The electric charge reconstruction is based on the
counting of the number of photoelectrons and on an overall efficiency
estimation on an event-by-event basis. Results from the application of both
methods are presented.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 12:37:54 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Arruda",
"Luísa",
""
],
[
"Barão",
"Fernando",
""
],
[
"Borges",
"João",
""
],
[
"Carmo",
"Fernando",
""
],
[
"Gonçalves",
"Patrícia",
""
],
[
"Pimenta",
"Mário",
""
]
] | [
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802.0111 | Laurence R. Taylor | Laurence R. Taylor | Quadratic enhancements of surfaces: two vanishing results | 3 pages | Proc. Amer. Math. Soc. 137 (2009), 1135-1138 | null | null | math.GT math.AT | null | This note records two results which were inexplicably omitted from our paper
on Pin structures on low dimensional manifolds, [KT]. Kirby chose not to be
listed as a coauthor.
A Pin^- structure on a surface F induces a quadratic enhancement of the mod 2
intersection form, q: H_1(F;Z/2Z) -> Z/4Z
Theorem 1.1 says that q vanishes on the kernel of the map in homology to a
bounding 3-manifold. This is used by Kreck and Puppe (arXiv:0707.1599
[math.AT]) who refer for a proof to an email of the author to Kreck. A more
polished and public proof seems desirable.
In [KT], section 6, a Pin^- structure is constructed on a surface F dual to
w_2 in an oriented 4-manifold M^4. Theorem 2.1 says that q vanishes on the
Poincare dual to the image of H^1(M^4;Z/2Z) in H^1(F;Z/2Z).
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:53:36 GMT"
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[
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] |
802.0112 | Olivier Piguet | Clisthenis P. Constantinidis, Jose Andre Lourenco, Ivan Morales,
Olivier Piguet and Alex Rios | Canonical Analysis of the Jackiw-Teitelboim Model in the Temporal Gauge.
I. The Classical Theory | 15 pages, Latex. Misprint corrections | Class.Quant.Grav.25:125003,2008 | 10.1088/0264-9381/25/12/125003 | null | gr-qc | null | As a preparation for its quantization in the loop formalism, the
2-dimensional gravitation model of Jackiw and Teitelboim is analysed in the
classical canonical formalism. The dynamics is of pure constraints as it is
well-known. A partial gauge fixing of the temporal type being performed, the
resulting second class constraints are sorted out and the corresponding Dirac
bracket algebra is worked out. Dirac observables of this classical theory are
then calculated.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 12:37:18 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Feb 2008 23:51:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Constantinidis",
"Clisthenis P.",
""
],
[
"Lourenco",
"Jose Andre",
""
],
[
"Morales",
"Ivan",
""
],
[
"Piguet",
"Olivier",
""
],
[
"Rios",
"Alex",
""
]
] | [
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] |
802.0113 | Nicolas Barbey | Nicolas Barbey (IAS, LSS), Fr\'ed\'eric Auch\`ere (IAS), Thomas Rodet
(LSS), Jean-Claude Vial (IAS) | A Time-Evolving 3D Method Dedicated to the Reconstruction of Solar
plumes and Results Using Extreme Ultra-Violet Data | null | null | 10.1007/s11207-008-9151-6 | null | astro-ph stat.AP | null | An important issue in the tomographic reconstruction of the solar poles is
the relatively rapid evolution of the polar plumes. We demonstrate that it is
possible to take into account this temporal evolution in the reconstruction.
The difficulty of this problem comes from the fact that we want a 4D
reconstruction (three spatial dimensions plus time) while we only have 3D data
(2D images plus time). To overcome this difficulty, we introduce a model that
describes polar plumes as stationary objects whose intensity varies
homogeneously with time. This assumption can be physically justified if one
accepts the stability of the magnetic structure. This model leads to a bilinear
inverse problem. We describe how to extend linear inversion methods to these
kinds of problems. Studies of simulations show the reliability of our method.
Results for SOHO/EIT data show that we are able to estimate the temporal
evolution of polar plumes in order to improve the reconstruction of the solar
poles from only one point of view. We expect further improvements from
STEREO/EUVI data when the two probes will be separated by about 60 degrees.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 12:38:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barbey",
"Nicolas",
"",
"IAS, LSS"
],
[
"Auchère",
"Frédéric",
"",
"IAS"
],
[
"Rodet",
"Thomas",
"",
"LSS"
],
[
"Vial",
"Jean-Claude",
"",
"IAS"
]
] | [
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] |
802.0114 | Maurizio Quadrio | Pierre Ricco, Maurizio Quadrio | Wall-oscillation conditions for drag reduction in turbulent channel flow | Accepted for publication in the International Journal of Heat and
Fluid Flow | null | null | null | physics.flu-dyn | null | The drag reduction properties of a turbulent channel flow modified by
spanwise sinusoidal oscillations of the walls are investigated by direct
numerical simulations. The work is based on the linear relation between the
drag reduction and the parameter $S$, function of the maximum wall velocity and
the period of the oscillation. This quantity has been found through physical
arguments pertaining to the action of the oscillating Stokes layer on the
near-wall turbulence dynamics. The predictive potential of the scaling
parameter is exploited to gain insight into the drag-reducing effects of the
oscillating wall technique. The period of oscillation which guarantees the
maximum drag reduction for a given maximum wall displacement is studied for the
first time. The issue of the minimum intensity of wall forcing required to
produce a non-zero drag reduction effect and the dependence of the drag
reduction on the Reynolds number are also addressed. The drag reduction data
available in the literature are compared with the prediction given by the
scaling parameter, thus attaining a comprehensive view of the state of the art.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 12:52:11 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Ricco",
"Pierre",
""
],
[
"Quadrio",
"Maurizio",
""
]
] | [
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] |
802.0115 | Samir El Shawish | Samir El Shawish, Jure Dobnikar, and Emmanuel Trizac | Ground states of colloidal molecular crystals on periodic substrates | 12 pages, 13 figures | Soft Matter, 4, 1491 (2008) | null | null | cond-mat.soft | null | Two dimensional suspensions of spherical colloids subject to periodic
external fields exhibit a rich variety of molecular crystalline phases. We
study in simulations the ground state configurations of dimeric and trimeric
systems, that are realized on square and triangular lattices, when either two
or three macroions are trapped in each external potential minimum. Bipartite
orders of the checkerboard or stripe types are reported together with more
complex quadripartite orderings, and the shortcomings of envisioning the
colloids gathered in a single potential minimum as a composite rigid object are
discussed. This work also sheds light on simplifying assumptions underlying
previous theoretical treatments and that made possible the mapping onto spin
models.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 13:05:57 GMT"
}
] | 2008-11-28T00:00:00 | [
[
"Shawish",
"Samir El",
""
],
[
"Dobnikar",
"Jure",
""
],
[
"Trizac",
"Emmanuel",
""
]
] | [
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] |
802.0116 | Lutz Schr\"oder | Lutz Schr\"oder and Dirk Patinson | Shallow Models for Non-Iterative Modal Logics | null | null | null | Imperial College TR Computing 2008/3 | cs.LO cs.AI cs.CC cs.MA | null | The methods used to establish PSPACE-bounds for modal logics can roughly be
grouped into two classes: syntax driven methods establish that exhaustive proof
search can be performed in polynomial space whereas semantic approaches
directly construct shallow models. In this paper, we follow the latter approach
and establish generic PSPACE-bounds for a large and heterogeneous class of
modal logics in a coalgebraic framework. In particular, no complete
axiomatisation of the logic under scrutiny is needed. This does not only
complement our earlier, syntactic, approach conceptually, but also covers a
wide variety of new examples which are difficult to harness by purely syntactic
means. Apart from re-proving known complexity bounds for a large variety of
structurally different logics, we apply our method to obtain previously unknown
PSPACE-bounds for Elgesem's logic of agency and for graded modal logic over
reflexive frames.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 13:11:09 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Mar 2008 20:48:05 GMT"
},
{
"version": "v3",
"created": "Thu, 3 Apr 2008 09:34:18 GMT"
}
] | 2008-04-03T00:00:00 | [
[
"Schröder",
"Lutz",
""
],
[
"Patinson",
"Dirk",
""
]
] | [
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] |
802.0117 | Hrishikesh Ganu | Hrishikesh V. Ganu | Air Traffic Flow Management | 31 pages, 2 figures | null | null | null | math.OC math.CO | null | Air Traffic Flow Management is the regulation of air traffic in order to
avoid exceeding airport or flight sector capacity in handling traffic, and to
ensure that available capacity is used efficiently. We have tried to explore
the logic behind the claims by Bertsimas et.al about integral solutions to the
LP relaxation of the Traffic Flow Management Problem(TFMP). Polyhedral theory
only indicates that the stronger TFMP formulation of Bertsimas et.al might lead
to integral solutions in some cases. Our computations indicate that the
encouraging results reported by Bertsimas et.al are not merely fortuitous or
due to their specific data set. Indeed, we found that the TFMP had integral
solutions even in case of artificial data sets generated to include severe
conflicts in the flight schedules. In our limited tests with 4-5 scenarios, we
obtained non-integral solutions only once. This is of significant practical
importance because, the LP relaxation can be solved even on small machines with
low memory and processor speed.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 13:15:31 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Ganu",
"Hrishikesh V.",
""
]
] | [
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] |
802.0118 | Karl Lorensen | Karl Lorensen | Groups with the same cohomology as their profinite completions | The final version corrects several misprints that appeared in the
published version. In addition, it remedies some mistaken attributions
regarding quasipotent groups | J. Algebra 320 (2008), 1704-1722 | null | null | math.GR math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For any positive integer $n$, $\mathcal{A}_n$ is the class of all groups $G$
such that, for $0\leq i\leq n$, $H^i(\hat{G},A)\cong H^i(G,A)$ for every finite
discrete $\hat{G}$-module $A$. We describe certain types of free products with
amalgam and HNN extensions that are in some of the classes $\mathcal{A}_n$. In
addition, we investigate the residually finite groups in the class
$\mathcal{A}_2$.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 13:23:45 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Apr 2008 08:24:28 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Apr 2008 12:01:00 GMT"
},
{
"version": "v4",
"created": "Thu, 28 Aug 2008 18:50:32 GMT"
},
{
"version": "v5",
"created": "Thu, 4 Dec 2008 22:22:43 GMT"
},
{
"version": "v6",
"created": "Wed, 15 Sep 2010 00:42:25 GMT"
}
] | 2010-09-16T00:00:00 | [
[
"Lorensen",
"Karl",
""
]
] | [
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] |
802.0119 | James Langley | Walter Bergweiler, Alastair Fletcher, Jim Langley and Janis Meyer | The escaping set of a quasiregular mapping | 10 pages | Proc. Amer. Math. Soc. 137 (2009), 641-651 | 10.1090/S0002-9939-08-09609-3 | null | math.CV | null | We show that if the maximum modulus of a quasiregular mapping f grows
sufficiently rapidly then there exists a non-empty escaping set I(f) consisting
of points whose forward orbits under iteration tend to infinity. This set I(f)
has an unbounded component but, in contrast to the case of entire functions on
the complex plane, the closure of I(f) may have a bounded component.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 13:29:27 GMT"
}
] | 2009-01-17T00:00:00 | [
[
"Bergweiler",
"Walter",
""
],
[
"Fletcher",
"Alastair",
""
],
[
"Langley",
"Jim",
""
],
[
"Meyer",
"Janis",
""
]
] | [
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802.012 | Thomas Wiegelmann | T. Wiegelmann, S.K. Solanki | Similarities and Differences between Coronal Holes and the Quiet Sun:
Are Loop Statistics the Key? | 26 pages, 11 figures | Solar Phys.225:227,2004 | 10.1007/s11207-004-3747-2 | null | astro-ph | null | Coronal holes (CH) emit significantly less at coronal temperatures than
quiet-Sun regions (QS), but can hardly be distinguished in most chromospheric
and lower transition region lines. A key quantity for the understanding of this
phenomenon is the magnetic field. We use data from SOHO/MDI to reconstruct the
magnetic field in coronal holes and the quiet Sun with the help of a potential
magnetic model. Starting from a regular grid on the solar surface we then trace
field lines, which provide the overall geometry of the 3D magnetic field
structure. We distinguish between open and closed field lines, with the closed
field lines being assumed to represent magnetic loops. We then try to compute
some properties of coronal loops. The loops in the coronal holes (CH) are found
to be on average flatter than in the QS. High and long closed loops are
extremely rare, whereas short and low-lying loops are almost as abundant in
coronal holes as in the quiet Sun. When interpreted in the light of loop
scaling laws this result suggests an explanation for the relatively strong
chromospheric and transition region emission (many low-lying, short loops), but
the weak coronal emission (few high and long loops) in coronal holes. In spite
of this contrast our calculations also suggest that a significant fraction of
the cool emission in CHs comes from the open flux regions. Despite these
insights provided by the magnetic field line statistics further work is needed
to obtain a definite answer to the question if loop statistics explain the
differences between coronal holes and the quiet Sun.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 13:31:52 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Wiegelmann",
"T.",
""
],
[
"Solanki",
"S. K.",
""
]
] | [
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802.0121 | Shamayita Ray | Amol Dighe and Shamayita Ray (Tata Inst.) | CPT violation in long baseline neutrino experiments: a three flavor
analysis | v2: 23 pages, 8 figures, revtex4. A new section on non-standard
interaction (NSI) of neutrinos added. Version to appear in Phys. Rev. D | Phys.Rev.D78:036002,2008 | 10.1103/PhysRevD.78.036002 | TIFR/TH/08-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore possible signals of CPT violation in neutrinos in the complete
three-flavor framework. Employing a systematic expansion in small parameters,
we analytically estimate the CPT violating contributions to the survival
probabilities of $\nu_\mu, \bar{\nu}_\mu, \nu_e$ and $\bar{\nu}_e$. The results
indicate that, in spite of the large number of CPT violating parameters, only a
small number of combinations are relevant for oscillation experiments. We
identify the combinations that can be constrained at the long baseline
experiments, and show that their contribution to the neutrino Hamiltonian can
be bounded to $< 10^{-23}$ GeV, by considering the NOvA experiment for the muon
sector, and neutrino factories for the electron sector.This formalism also
allows us to translate the bounds on the parameters describing non-standard
interactions of neutrinos into the bounds on CPT violating quantities.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:16:18 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jul 2008 10:45:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dighe",
"Amol",
"",
"Tata Inst."
],
[
"Ray",
"Shamayita",
"",
"Tata Inst."
]
] | [
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] |
802.0122 | Paula Rivi\`ere | Paula Rivi\`ere, Camilo Ruiz and Jan-Michael Rost | Attosecond light pulse induced photo-association | 7 pages, 8 figures | Physical Review A, 77, 033421 (2008) | 10.1103/PhysRevA.77.033421 | null | physics.atom-ph | null | We explore stimulated photo-association in the context of attosecond
pump-probe schemes of atomic matter. An attosecond pulse -- the probe -- is
used to induce photo-association of an electronic wave packet which had been
created before, typically with an attosecond pump pulse at an atomic center
different from the one of photo-association. We will show that the electron
absorption is maximal for a certain delay between the pulses. Two ways of
enhancing and controlling stimulated photo-association are proposed, namely
using an additional infrared pulse to steer the electronic wave packet and
using a train of attosecond pulses instead of a single pair. A direct
application of ultrafast stimulated photo-association is the measurement of
atomic distances.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 13:44:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rivière",
"Paula",
""
],
[
"Ruiz",
"Camilo",
""
],
[
"Rost",
"Jan-Michael",
""
]
] | [
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802.0123 | Michel Rumin | Michel Rumin and Neil Seshadri | Analytic torsions on contact manifolds | 40 pages | Annales de l'institut Fourier, 62 no. 2 (2012), p. 727-782 | 10.5802/aif.2693 | null | math.DG math.SP | null | We propose a definition for analytic torsion of the contact complex on
contact manifolds. We show it coincides with Ray-Singer torsion on any
3-dimensional CR Seifert manifold equipped with a unitary representation. In
this particular case we compute it and relate it to dynamical properties of the
Reeb flow. In fact the whole spectral torsion function we consider may be
interpreted on CR Seifert manifolds as a purely dynamical function through
Selberg-type trace formulae.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:12:04 GMT"
}
] | 2013-01-28T00:00:00 | [
[
"Rumin",
"Michel",
""
],
[
"Seshadri",
"Neil",
""
]
] | [
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802.0124 | Thomas Wiegelmann | T. Wiegelmann | Optimization code with weighting function for the reconstruction of
coronal magnetic fields | 23 pages, 5 figures | Solar Phys.219:87,2004 | 10.1023/B:SOLA.0000021799.39465.36 | null | astro-ph | null | We developed a code for the reconstruction of nonlinear force-free and
non-force-free coronal magnetic fields. The 3D magnetic field is computed
numerically with the help of an optimization principle. The force-free and
non-force-free codes are compiled in one program. The force-free approach needs
photospheric vector magnetograms as input. The non-force-free code additionally
requires the line-of-sight integrated coronal density distribution in
combination with a tomographic inversion code. Previously the optimization
approach has been used to compute magnetic fields using all six boundaries of a
computational box. Here we extend this method and show how the coronal magnetic
field can be reconstructed only from the bottom boundary, where the boundary
conditions are measured with vector magnetographs. The program is planed for
use within the Stereo mission.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 13:59:51 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Wiegelmann",
"T.",
""
]
] | [
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] |
802.0125 | Jing-Ling Chen | Jing-Ling Chen, Dong-Ling Deng, and Ming-Guang Hu | Gisin's theorem for two d-dimensional systems based on the
Collins-Gisin-Linden-Masser-Popescu inequality | 4 pages, 1 figure, accepted for publication as a Rapid Communication
in Physical Review A | PHYSICAL REVIEW A 77, 060306(R) (2008) | 10.1103/PhysRevA.77.060306 | null | quant-ph | null | In this Rapid Communication, we show analytically that all pure entangled
states of two d-dimensional systems (qudits) violate the
Collins-Gisin-Linden-Masser-Popoescu (CGLMP) inequality. Thus one has the
Gisin's theorem for two qudits.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:10:50 GMT"
},
{
"version": "v2",
"created": "Thu, 8 May 2008 02:14:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chen",
"Jing-Ling",
""
],
[
"Deng",
"Dong-Ling",
""
],
[
"Hu",
"Ming-Guang",
""
]
] | [
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] |
802.0126 | Hassan Safari | Hassan Safari, Dirk-Gunnar Welsch, Ho Trung Dung, and Stefan Yoshi
Buhmann | Interatomic van der Waals potential in the presence of a
magneto-electric sphere | 13 pages, 7 figures | Physical Review A 77 (5), 053824 (2008) | 10.1103/PhysRevA.77.053824 | null | quant-ph | null | On the basis of a general formula obtained earlier via fourth-order
erturbation theory within the framework of macroscopic quantum electrodynamics,
the van der Waals potential between two neutral, unpolarized, ground-state
atoms in the presence of a homogeneous, dispersing and absorbing
magnetoelectric sphere is studied. When the radius of the sphere becomes
sufficiently large, the result asymptotically agrees with that for two atoms
near a planar interface. In the opposite limit of a very small sphere, the
sphere can effectively be regarded as being a third ground-state atom, and the
nonadditive three-atom van der Waals potential is recovered. To illustrate the
effect of a sphere of arbitrary radius, numerical results are presented for the
triangular arrangement where the atoms are at equidistance from the sphere, and
for the linear arrangement where the atoms and the sphere are aligned along a
straight line. As demonstrated, the enhancement or reduction of the interaction
potential in the presence of purely electric or magnetic spheres can be
physically understood in terms of image charges.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:12:59 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jun 2008 08:59:55 GMT"
}
] | 2008-08-14T00:00:00 | [
[
"Safari",
"Hassan",
""
],
[
"Welsch",
"Dirk-Gunnar",
""
],
[
"Dung",
"Ho Trung",
""
],
[
"Buhmann",
"Stefan Yoshi",
""
]
] | [
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802.0127 | Henning Heiselberg Dr. | Henning Heiselberg | Phases in optical lattices vs. Coulomb frustrated HTc cuprates | 8 pages, 3 figures | null | null | null | cond-mat.supr-con cond-mat.str-el | null | Fermionic atoms in 2D optical lattices and electrons in HTc cuprates may both
be described by the Hubbard model. However, if Coulomb frustration is
responsible for the striped phases in 2D cuprates the phase diagrams will
differ markedly. Two representative scenarios are described by a simple stripe
model without phase separation and a mean field model with phase separation in
the absence of Coulomb frustration. When Coulomb frustrated both models display
antiferromagnetism (AF) and stripe phases with d-wave superfluidity, whereas
neutral atoms in optical lattices will only do so in the stripe model. Radii
and densities of the various phases in harmonically confined optical lattices
are calculated for the two models and have very different Mott plateaus and
density discontinuities. We discuss observation of antiferromagnetic, stripe
and superfluid phases in density and momentum distributions and correlations
from time-of-flight experiments.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:09:05 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Heiselberg",
"Henning",
""
]
] | [
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] |
802.0128 | V. V. Kabanov | V. V. Kabanov and A. S. Alexandrov | Magnetic quantum oscillations in doped antiferromagnetic insulators | 4 pages 4 figures | Phys. Rev. B 77, 132403 (2008) | 10.1103/PhysRevB.77.132403 | null | cond-mat.str-el cond-mat.supr-con | null | Energy spectrum of electrons (holes) doped into a two-dimensional
antiferromagnetic insulator is quantized in an external magnetic field of
arbitrary direction. A peculiar dependence of de Haas-van Alphen (dHvA) or
Shubnikov-de Haas (SdH) magneto-oscillation amplitudes on the azimuthal
in-plane angle from the magnetization direction and on the polar angle from the
out-of-plane direction is found, which can be used as a sensitive probe of the
antiferromagnetic order in doped Mott-Hubbard, spin-density wave (SDW), and
conventional band-structure insulators.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:22:03 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 14:17:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kabanov",
"V. V.",
""
],
[
"Alexandrov",
"A. S.",
""
]
] | [
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] |
802.0129 | Martin Raue | M. Raue, D. Mazin | Optical depth for VHE gamma-rays from distant sources from a generic EBL
density | Proceedings of the workshop 'High Energy Phenomena in Relativistic
Outflows' (HEPRO), Dublin, 24-28 September 2007 | Int.J.Mod.Phys.D17:1515-1520,2008 | 10.1142/S0218271808013091 | null | astro-ph | null | Very-high-energy (VHE; E>100GeV) gamma-rays from distant sources suffer
attenuation through pair-production with low energy photons from the diffuse
extragalactic photon fields in the ultraviolet (UV) to far-infrared (FIR)
(commonly referred to as Extragalactic Background Light; EBL). When modeling
the intrinsic spectra of the VHE gamma-ray sources it is crucial to correctly
account for the attenuation. Unfortunately, direct measurements of the EBL are
difficult and the knowledge about the EBL over certain wavelength ranges is
poor. To calculate the EBL attenuation usually predictions from theoretical
models are used. Recently, the limits on the EBL from direct and indirect
methods have narrowed down the possible EBL range and many of the previous
models are in conflict with these limits. We propose a new generic EBL density
(not a complete model), which is in compliance with the new EBL limits. EBL
evolution with redshift is included in the calculation in a very simple but
effective ad-hoc way. Properties of this generic EBL are discussed.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:26:02 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Raue",
"M.",
""
],
[
"Mazin",
"D.",
""
]
] | [
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] |
802.013 | Zeev Schuss | D. Ezri, B.Z. Bobrovsky, Z. Schuss | About the true type of smoothers | Non-causal estimation | null | null | null | math.OC cs.IT math.IT | null | We employ the variational formulation and the Euler-Lagrange equations to
study the steady-state error in linear non-causal estimators (smoothers). We
give a complete description of the steady-state error for inputs that are
polynomial in time. We show that the steady-state error regime in a smoother is
similar to that in a filter of double the type. This means that the
steady-state error in the optimal smoother is significantly smaller than that
in the Kalman filter. The results reveal a significant advantage of smoothing
over filtering with respect to robustness to model uncertainty.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:23:31 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Ezri",
"D.",
""
],
[
"Bobrovsky",
"B. Z.",
""
],
[
"Schuss",
"Z.",
""
]
] | [
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] |
802.0131 | Jerome Bobin | J.Bobin, J-L Starck and R. Ottensamer | Compressed Sensing in Astronomy | 30 pages - submitted to IEEE Journal on Selected Topics in Signal
Processing | null | 10.1109/JSTSP.2008.2005337 | null | astro-ph | null | Recent advances in signal processing have focused on the use of sparse
representations in various applications. A new field of interest based on
sparsity has recently emerged: compressed sensing. This theory is a new
sampling framework that provides an alternative to the well-known Shannon
sampling theory. In this paper we investigate how compressed sensing (CS) can
provide new insights into astronomical data compression and more generally how
it paves the way for new conceptions in astronomical remote sensing. We first
give a brief overview of the compressed sensing theory which provides very
simple coding process with low computational cost, thus favoring its use for
real-time applications often found on board space mission. We introduce a
practical and effective recovery algorithm for decoding compressed data. In
astronomy, physical prior information is often crucial for devising effective
signal processing methods. We particularly point out that a CS-based
compression scheme is flexible enough to account for such information. In this
context, compressed sensing is a new framework in which data acquisition and
data processing are merged. We show also that CS provides a new fantastic way
to handle multiple observations of the same field view, allowing us to recover
information at very low signal-to-noise ratio, which is impossible with
standard compression methods. This CS data fusion concept could lead to an
elegant and effective way to solve the problem ESA is faced with, for the
transmission to the earth of the data collected by PACS, one of the instruments
on board the Herschel spacecraft which will be launched in 2008.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:29:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bobin",
"J.",
""
],
[
"Starck",
"J-L",
""
],
[
"Ottensamer",
"R.",
""
]
] | [
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] |
802.0132 | Philip Dufton | P.L. Dufton, R.S.I. Ryans, H.M.A. Thompson, R.A. Street | The iron abundance of the Magellanic Bridge | Accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.385:2261-2268,2008 | 10.1111/j.1365-2966.2008.12997.x | null | astro-ph | null | High-resolution HST ultra-violet spectra for five B-type stars in the
Magellanic Bridge and in the Large and Small Magellanic Clouds have been
analysed to estimate their iron abundances. Those for the Clouds are lower than
estimates obtained from late-type stars or the optical lines in B-type stars by
approximately 0.5 dex. This may be due to systematic errors possibly arising
from non-LTE effects or from errors in the atomic data as similar low Fe
abundances having previously been reported from the analysis of the
ultra-violet spectra of Galactic early-type stars. The iron abundance estimates
for all three Bridge targets appear to be significantly lower than those found
for the SMC and LMC by approximately -0.5 dex and -0.8 dex respectively and
these differential results should not be affected by any systematic errors
present in the absolute abundance estimates. These differential iron abundance
estimates are consistent with the underabundances for C, N, O, Mg and Si of
approximately -1.1 dex relative to our Galaxy previously found in our Bridge
targets. The implications of these very low metal abundances for the Magellanic
Bridge are discussed in terms of metal deficient material being stripped from
the SMC.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:35:51 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Dufton",
"P. L.",
""
],
[
"Ryans",
"R. S. I.",
""
],
[
"Thompson",
"H. M. A.",
""
],
[
"Street",
"R. A.",
""
]
] | [
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] |
802.0133 | Douglas M. Slauson | Palle E.T. Jorgensen | Essential selfadjointness of the graph-Laplacian | 50 pages with TOC and figures | null | 10.1063/1.2953684 | null | math-ph math.MP | null | We study the operator theory associated with such infinite graphs $G$ as
occur in electrical networks, in fractals, in statistical mechanics, and even
in internet search engines. Our emphasis is on the determination of spectral
data for a natural Laplace operator associated with the graph in question. This
operator $\Delta$ will depend not only on $G$, but also on a prescribed
positive real valued function $c$ defined on the edges in $G$. In electrical
network models, this function $c$ will determine a conductance number for each
edge. We show that the corresponding Laplace operator $\Delta$ is automatically
essential selfadjoint. By this we mean that $\Delta$ is defined on the dense
subspace $\mathcal{D}$ (of all the real valued functions on the set of vertices
$G^{0}$ with finite support) in the Hilbert space $l^{2}% (G^{0})$. The
conclusion is that the closure of the operator $\Delta$ is selfadjoint in
$l^{2}(G^{0})$, and so in particular that it has a unique spectral resolution,
determined by a projection valued measure on the Borel subsets of the infinite
half-line. We prove that generically our graph Laplace operator
$\Delta=\Delta_{c}$ will have continuous spectrum. For a given infinite graph
$G$ with conductance function $c$, we set up a system of finite graphs with
periodic boundary conditions such the finite spectra, for an ascending family
of finite graphs, will have the Laplace operator for $G$ as its limit.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:36:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jorgensen",
"Palle E. T.",
""
]
] | [
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] |
802.0134 | Yan Liqin | Li-qin Yan, Ferran Maci\'a, Jun-rong Zhang, Zhong-wei Jiang, Jun Shen,
Lun-hua He, Fang-wei Wang | Glassy magnetic behavior induced by $Cu^{2+}$ substitution in frustrated
antiferromagnet $ZnCr_2O_4$ | 9 pages, 11 figures | null | null | null | cond-mat.mtrl-sci cond-mat.dis-nn | null | Structure and magnetic properties of the compounds $Zn_{1-x}Cu_xCr_2O_4$
(ZCCO) are investigated systematically. A structural phase transition from
space-group symmetry $Fd3m$ to $I4_1/amd$ is observed in ZCCO. The critical
value of the doping, $x$, appears at $0.58\sim 0.62$ through the appearance of
a splitting of diffraction peaks at room temperature. Measurements of dc
magnetization, ac susceptibility, memory effect and exchange bias-like
(EB-like) effect have been performed to reveal the glassy magnetic behaviors of
ZCCO. The system with $x\leqslant 0.50$ is suggested as a spin glass-like
(SG-like) of magnetic characterization whereas doping values of $0.58\leqslant
x\leqslant 0.90$ defines the system as a $"$cluster glass-like$"$ (CG-like)
with unidirectional anisotropy. The Cu content suppresses the geometrical
frustration of $ZnCr_2O_4$, which may correlate with the pinning effect of Cu
sublattice on Cr sublattice to a preferential direction.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 06:57:23 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Yan",
"Li-qin",
""
],
[
"Maciá",
"Ferran",
""
],
[
"Zhang",
"Jun-rong",
""
],
[
"Jiang",
"Zhong-wei",
""
],
[
"Shen",
"Jun",
""
],
[
"He",
"Lun-hua",
""
],
[
"Wang",
"Fang-wei",
""
]
] | [
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] |
802.0135 | Istv\'an D\'ek\'any | I. Dekany, G. Kovacs, J. Jurcsik, R. Szabo, M. Varadi, A. Sodor, K.
Posztobanyi, Zs. Hurta, K. Vida, N. Vityi, and A. Szing | Pulsational and evolutionary analysis of the double-mode RR Lyrae star
BS Com | Accepted for publication by MNRAS on 2008 February 01. The paper
contains 4 figures and 8 tables | null | 10.1111/j.1365-2966.2008.13060.x | null | astro-ph | null | We derive the basic physical parameters of the field double-mode RR Lyrae
star BS Com from its observed periods and the requirement of consistency
between the pulsational and evolutionary constraints. By using the current
solar-scaled horizontal branch evolutionary models of Pietrinferni et al.
(2004) and our linear non-adiabatic purely radiative pulsational models, we get
M/M(Sun) = 0.698 +/- 0.004, log(L/L(Sun)) = 1.712 +/- 0.005, T(eff) = 6840 +/-
14 K, [Fe/H] = -1.67 +/- 0.01, where the errors are standard deviations
assuming uniform age distribution along the full range of uncertainty in age.
The last two parameters are in a good agreement with the ones derived from the
observed BVIc colours and the updated ATLAS9 stellar atmosphere models. We get
T(eff) = 6842 +/- 10 K, [Fe/H] = -1.58 +/- 0.11, where the errors are purely
statistical ones. It is remarkable that the derived parameters are nearly
independent of stellar age at early evolutionary stages. Later stages,
corresponding to the evolution toward the asymptotic giant branch are most
probably excluded because the required high temperatures are less likely to
satisfy the constraints posed by the colours. We also show that our conclusions
are only weakly sensitive to nonlinear period shifts predicted by current
hydrodynamical models.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:43:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dekany",
"I.",
""
],
[
"Kovacs",
"G.",
""
],
[
"Jurcsik",
"J.",
""
],
[
"Szabo",
"R.",
""
],
[
"Varadi",
"M.",
""
],
[
"Sodor",
"A.",
""
],
[
"Posztobanyi",
"K.",
""
],
[
"Hurta",
"Zs.",
""
],
[
"Vida",
"K.",
""
],
[
"Vityi",
"N.",
""
],
[
"Szing",
"A.",
""
]
] | [
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] |
802.0136 | Jeremy O'Brien | Alberto Politi, Martin J. Cryan, John G. Rarity, Siyuan Yu, and Jeremy
L. O'Brien | Silica-on-Silicon Waveguide Quantum Circuits | 4 pages, 4 figures, comments welcome | Science 27 March (2008) (10.1126/science.1155441) | 10.1126/science.1155441 | null | quant-ph | null | Quantum technologies based on photons are anticipated in the areas of
information processing, communication, metrology, and lithography. While there
have been impressive proof-of-principle demonstrations in all of these areas,
future technologies will likely require an integrated optics architecture for
improved performance, miniaturization and scalability. We demonstrated high-
fidelity silica-on-silicon integrated optical realizations of key quantum
photonic circuits, including two-photon quantum interference with a visibility
of 94.8(5)%; a controlled-NOT gate with logical basis fidelity of 94.3(2)%; and
a path entangled state of two photons with fidelity >92%.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:44:32 GMT"
}
] | 2008-03-31T00:00:00 | [
[
"Politi",
"Alberto",
""
],
[
"Cryan",
"Martin J.",
""
],
[
"Rarity",
"John G.",
""
],
[
"Yu",
"Siyuan",
""
],
[
"O'Brien",
"Jeremy L.",
""
]
] | [
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] |
802.0137 | Pierre Sutra | Pierre Sutra (INRIA Rocquencourt), Marc Shapiro (INRIA Rocquencourt) | Fault-Tolerant Partial Replication in Large-Scale Database Systems | null | null | null | RR-6440 | cs.DB | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a decentralised approach to committing transactions in a
replicated database, under partial replication. Previous protocols either
re-execute transactions entirely and/or compute a total order of transactions.
In contrast, ours applies update values, and orders only conflicting
transactions. It results that transactions execute faster, and distributed
databases commit in small committees. Both effects contribute to preserve
scalability as the number of databases and transactions increase. Our algorithm
ensures serializability, and is live and safe in spite of faults.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:47:24 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 16:47:09 GMT"
},
{
"version": "v3",
"created": "Tue, 31 Mar 2009 14:41:43 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Sutra",
"Pierre",
"",
"INRIA Rocquencourt"
],
[
"Shapiro",
"Marc",
"",
"INRIA Rocquencourt"
]
] | [
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] |
802.0138 | Ulf Saalmann | Ulf Saalmann and Jan M. Rost | Rescattering for extended atomic systems | 4 pages, 3 figures, 1 table | Phys. Rev. Lett. 100, 133006 (2008) | 10.1103/PhysRevLett.100.133006 | null | physics.atm-clus physics.atom-ph physics.space-ph | null | Laser-driven rescattering of electrons is the basis of many strong-field
phenomena in atoms and molecules. Here, we will show how this mechanism
operates in extended atomic systems, giving rise to effective energy
absorption. Rescattering from extended systems can also lead to energy loss,
which in its extreme form results in non-linear photo-association.
Intense-laser interaction with atomic clusters is discussed as an example. We
explain fast electron emission, seen in experimental and numerically obtained
spectra, by rescattering of electrons at the highly charged cluster.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:47:40 GMT"
}
] | 2008-04-07T00:00:00 | [
[
"Saalmann",
"Ulf",
""
],
[
"Rost",
"Jan M.",
""
]
] | [
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802.0139 | Kari J. Eskola | K. J. Eskola, H. Paukkunen and C. A. Salgado | An improved global analysis of nuclear parton distribution functions
including RHIC data | 26 pages, 14 figures; for v2, we have revised the Table 1 and Fig.
13, and added the Fig. 14 and the Table 3 along with some more discussion | JHEP 0807:102,2008 | 10.1088/1126-6708/2008/07/102 | HIP-2008-03/TH | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an improved leading-order global DGLAP analysis of nuclear parton
distribution functions (nPDFs), supplementing the traditionally used data from
deep inelastic lepton-nucleus scattering and Drell-Yan dilepton production in
proton-nucleus collisions, with inclusive high-$p_T$ hadron production data
measured at RHIC in d+Au collisions. With the help of an extended definition of
the $\chi^2$ function, we now can more efficiently exploit the constraints the
different data sets offer, for gluon shadowing in particular, and account for
the overall data normalization uncertainties during the automated $\chi^2$
minimization. The very good simultaneous fit to the nuclear hard process data
used demonstrates the feasibility of a universal set of nPDFs, but also
limitations become visible. The high-$p_T$ forward-rapidity hadron data of
BRAHMS add a new crucial constraint into the analysis by offering a direct
probe for the nuclear gluon distributions -- a sector in the nPDFs which has
traditionally been very badly constrained. We obtain a strikingly stronger
gluon shadowing than what has been estimated in previous global analyses. The
obtained nPDFs are released as a parametrization called EPS08.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:56:35 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jul 2008 12:48:47 GMT"
}
] | 2010-03-25T00:00:00 | [
[
"Eskola",
"K. J.",
""
],
[
"Paukkunen",
"H.",
""
],
[
"Salgado",
"C. A.",
""
]
] | [
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] |
802.014 | Niels S{\o}ndergaard | Niels S{\o}ndergaard and Thomas Guhr | Families of spherical caps: spectra and ray limit | 28 pages, 7 figures | null | 10.1088/1751-8113/41/7/075309 | null | nlin.CD math-ph math.MP | null | We consider a family of surfaces of revolution ranging between a disc and a
hemisphere, that is spherical caps. For this family, we study the spectral
density in the ray limit and arrive at a trace formula with geodesic polygons
describing the spectral fluctuations. When the caps approach the hemisphere the
spectrum becomes equally spaced and highly degenerate whereas the derived trace
formula breaks down. We discuss its divergence and also derive a different
trace formula for this hemispherical case. We next turn to perturbative
corrections in the wave number where the work in the literature is done for
either flat domains or curved without boundaries. In the present case, we
calculate the leading correction explicitly and incorporate it into the
semiclassical expression for the fluctuating part of the spectral density. To
the best of our knowledge, this is the first calculation of such perturbative
corrections in the case of curvature and boundary.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 14:57:27 GMT"
}
] | 2016-08-17T00:00:00 | [
[
"Søndergaard",
"Niels",
""
],
[
"Guhr",
"Thomas",
""
]
] | [
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] |
802.0141 | Alessio Marrani | S. Bellucci, S. Ferrara, A. Marrani, A. Yeranyan | d=4 Black Hole Attractors in N=2 Supergravity with Fayet-Iliopoulos
Terms | 1+33 pages | Phys.Rev.D77:085027,2008 | 10.1103/PhysRevD.77.085027 | CERN-PH-TH/2008-020 | hep-th | null | We generalize the description of the d=4 Attractor Mechanism based on an
effective black hole (BH) potential to the presence of a gauging which does not
modify the derivatives of the scalars and does not involve hypermultiplets. The
obtained results do not rely necessarily on supersymmetry, and they can be
extended to d>4, as well. Thence, we work out the example of the stu model of
N=2 supergravity in the presence of Fayet-Iliopoulos terms, for the
supergravity analogues of the magnetic and D0-D6 BH charge configurations, and
in three different symplectic frames: the SO(1,1)^{2}, SO(2,2) covariant and
SO(8)-truncated ones. The attractive nature of the critical points, related to
the semi-positive definiteness of the Hessian matrix, is also studied.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:06:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bellucci",
"S.",
""
],
[
"Ferrara",
"S.",
""
],
[
"Marrani",
"A.",
""
],
[
"Yeranyan",
"A.",
""
]
] | [
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] |
802.0142 | Vasily Beskin | V. S. Beskin, E. E. Nokhrina | On the Cylindrical Grad-Shafranov Equation | In proceedings of High Energy Phenomena in Relativistic Outflows,
Dublin, Ireland | Int.J.Mod.Phys.D17:1731-1742,2008 | 10.1142/S0218271808013352 | null | astro-ph | null | The goal of this presentation is in paying attention to the 1D cylindrical
version of the Grad-Shafranov (GS) equation. In our opinion, this approach is
more rich than classical self-similar ones, and more suitable for astrophysical
jets we observe. In particular, it allows us describing the central (and,
hence, the most energetic) part of the flow.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:27:51 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Beskin",
"V. S.",
""
],
[
"Nokhrina",
"E. E.",
""
]
] | [
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] |
802.0143 | Fabian Hassler | F. Hassler, M. V. Suslov, G. M. Graf, M. V. Lebedev, G. B. Lesovik,
and G. Blatter | Wave-packet Formalism of Full Counting Statistics | 20 pages, 5 figures; major update, new figures and explanations
included as well as a discussion about finite temperatures and subleading
logarithmic terms | Phys. Rev. B 78, 165330 (2008) | 10.1103/PhysRevB.78.165330 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make use of the first-quantized wave-packet formulation of the full
counting statistics to describe charge transport of noninteracting electrons in
a mesoscopic device. We derive various expressions for the characteristic
function generating the full counting statistics, accounting for both energy
and time dependence in the scattering process and including exchange effects
due to finite overlap of the incoming wave packets. We apply our results to
describe the generic statistical properties of a two-fermion scattering event
and find, among other features, sub-binomial statistics for nonentangled
incoming states (Slater rank 1), while entangled states (Slater rank 2) may
generate super-binomial (and even super-Poissonian) noise, a feature that can
be used as a spin singlet-triplet detector. Another application is concerned
with the constant-voltage case, where we generalize the original result of
Levitov-Lesovik to account for energy-dependent scattering and finite
measurement time, including short time measurements, where Pauli blocking
becomes important.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:39:40 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Oct 2008 10:49:13 GMT"
}
] | 2008-10-30T00:00:00 | [
[
"Hassler",
"F.",
""
],
[
"Suslov",
"M. V.",
""
],
[
"Graf",
"G. M.",
""
],
[
"Lebedev",
"M. V.",
""
],
[
"Lesovik",
"G. B.",
""
],
[
"Blatter",
"G.",
""
]
] | [
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] |
802.0144 | Steven R. Cranmer | Steven R. Cranmer, Alexander V. Panasyuk, and John L. Kohl
(Harvard-Smithsonian CfA) | Improved Constraints on the Preferential Heating and Acceleration of
Oxygen Ions in the Extended Solar Corona | 19 pages (emulateapj style), 13 figures, ApJ, in press (v. 679; May
20, 2008) | Astrophys. J. (May 10, 2008), v. 678, pp. 1480-1497 | 10.1086/586890 | null | astro-ph | null | We present a detailed analysis of oxygen ion velocity distributions in the
extended solar corona, based on observations made with the Ultraviolet
Coronagraph Spectrometer (UVCS) on the SOHO spacecraft. Polar coronal holes at
solar minimum are known to exhibit broad line widths and unusual intensity
ratios of the O VI 1032, 1037 emission line doublet. The traditional
interpretation of these features has been that oxygen ions have a strong
temperature anisotropy, with the temperature perpendicular to the magnetic
field being much larger than the temperature parallel to the field. However,
recent work by Raouafi and Solanki suggested that it may be possible to model
the observations using an isotropic velocity distribution. In this paper we
analyze an expanded data set to show that the original interpretation of an
anisotropic distribution is the only one that is fully consistent with the
observations. It is necessary to search the full range of ion plasma parameters
to determine the values with the highest probability of agreement with the UVCS
data. The derived ion outflow speeds and perpendicular kinetic temperatures are
consistent with earlier results, and there continues to be strong evidence for
preferential ion heating and acceleration with respect to hydrogen. At
heliocentric heights above 2.1 solar radii, every UVCS data point is more
consistent with an anisotropic distribution than with an isotropic
distribution. At heights above 3 solar radii, the exact probability of isotropy
depends on the electron density chosen to simulate the line-of-sight
distribution of O VI emissivity. (abridged abstract)
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:19:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cranmer",
"Steven R.",
"",
"Harvard-Smithsonian CfA"
],
[
"Panasyuk",
"Alexander V.",
"",
"Harvard-Smithsonian CfA"
],
[
"Kohl",
"John L.",
"",
"Harvard-Smithsonian CfA"
]
] | [
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] |
802.0145 | Walter V. Pogosov | M. Combescot, W. V. Pogosov | Composite boson many-body theory for Frenkel excitons | 27 pages, 5 figures in separate files. Final version accepted for
publication in European Physical Journal B | Eur. Phys. J. B 68, 161 (2009) | 10.1140/epjb/e2009-00086-6 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a many-body theory for Frenkel excitons which takes into account
their composite nature exactly. Our approach is based on four commutators
similar to the ones we previously proposed for Wannier excitons. They allow us
to calculate any physical quantity dealing with $N$ excitons in terms of "Pauli
scatterings" for carrier exchange in the absence of carrier interaction and
"interaction scatterings" for carrier interaction in the absence of carrier
exchange. We show that Frenkel excitons have a novel "transfer assisted
exchange scattering", specific to these excitons. It comes from indirect
Coulomb processes between localized atomic states. These indirect processes,
commonly called "electron-hole exchange" in the case of Wannier excitons and
most often neglected, are crucial for Frenkel excitons, as they are the only
ones responsible for the excitation transfer. We also show that in spite of the
fact that Frenkel excitons are made of electrons and holes on the same atomic
site, so that we could naively see them as elementary particles, they
definitely are composite objects, their composite nature appearing through
various properties, not always easy to guess. The present many-body theory for
Frenkel excitons is thus going to appear as highly valuable to securely tackle
their many-body physics, as in the case of nonlinear optical effects in organic
semiconductors.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:22:18 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Oct 2008 13:59:19 GMT"
},
{
"version": "v3",
"created": "Fri, 30 Jan 2009 08:05:20 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Combescot",
"M.",
""
],
[
"Pogosov",
"W. V.",
""
]
] | [
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802.0146 | Tom Mestdag | T. Mestdag and M. Crampin | Invariant Lagrangians, mechanical connections and the Lagrange-Poincare
equations | 22 pages, to appear in J. Phys. A: Math. Theor., D2HFest special
issue | J. Phys. A: Math. Theor. 41 (2008) 344015 (20pp) | 10.1088/1751-8113/41/34/344015 | null | math.DG math-ph math.MP | null | We deal with Lagrangian systems that are invariant under the action of a
symmetry group. The mechanical connection is a principal connection that is
associated to Lagrangians which have a kinetic energy function that is defined
by a Riemannian metric. In this paper we extend this notion to arbitrary
Lagrangians. We then derive the reduced Lagrange-Poincare equations in a new
fashion and we show how solutions of the Euler-Lagrange equations can be
reconstructed with the help of the mechanical connection. Illustrative examples
confirm the theory.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:27:17 GMT"
}
] | 2008-09-03T00:00:00 | [
[
"Mestdag",
"T.",
""
],
[
"Crampin",
"M.",
""
]
] | [
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] |
802.0147 | Carlos de los Heros | C. de los Heros (for the IceCube Collaboration) | Particle astrophysics from the cold: Results and perspectives of IceCube | To appear in the proceedings of the first AFI symposium, From the
Vacuum to the Universe, Innsbruck, 19-20/10/2007. To be published by
Innsbruck University Press. Eds S. D. Bass, F. Schallhart and B. Tasser | null | null | Innsbruck University Press. ISBN 978-3-902571-53-3 | astro-ph | null | We discuss results of the AMANDA neutrino telescope, in operation at the
South Pole since 2000, and present the status and scientific potential of its
km$^3$ extension, IceCube.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:30:39 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Heros",
"C. de los",
"",
"for the IceCube Collaboration"
]
] | [
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] |
802.0148 | Avner Fleischer | Avner Fleischer and Nimrod Moiseyev | Generation of Higher-Order Harmonics By Addition of a High Frequency XUV
Radiation to the IR One | 15 pages, 6 figures | null | null | null | physics.atom-ph physics.chem-ph | null | The irradiation of atoms by a strong IR laser field of frequency $\omega$
results in the emission of odd-harmonics of $\omega$ ("IR harmonics") up to
some maximal cut-off frequency. The addition of an XUV field of frequency
$\tilde{q}\omega$ larger than the IR cut-off frequency to the IR driver field
leads to the appearance of new higher-order harmonics ("XUV harmonics")
$\tilde{q} \pm 2K, 2\tilde{q} \pm (2K-1), 3\tilde{q} \pm 2K,...$ ($K$ integer)
which were absent in the spectra in the presence of the IR field alone. The
mechanism responsible for the appearance of the XUV harmonics is analyzed
analytically using a generalization of the semiclassical re-collision
(three-step) model of high harmonic generation. It is shown that the emitted
HHG radiation field can be written as a serie of terms, with the HHG field
obtained from the three-step model in its most familiar context [P. B. Corkum,
\textit{Phys. Rev. Lett.} {\bf 71}, 1994 (1993)] resulting from the
zeroth-order term. The origin of the higher-order terms is shown to be the
ac-Stark oscillations of the remaining ground electronic state which are
induced by the XUV field. These terms are responsible for the appearance of the
new XUV harmonics in the HGS. The XUV harmonics are formed by the same electron
trajectories which form the IR harmonics and have the same emission times, but
a much lower intensity than the IR harmonics, due to the small quiver amplitude
of the ac-Stark oscillation. Nevertheless, this mechanism allows the extension
of the cut-off in the HGS without the necessity of increasing the IR field
intensity, as is verified by numerical time-dependent Schr\"{o}dinger equation
simulation of a Xe atom shined by a combination of IR and XUV field.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:32:47 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Fleischer",
"Avner",
""
],
[
"Moiseyev",
"Nimrod",
""
]
] | [
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] |
802.0149 | Bo Milvang-Jensen | Bo Milvang-Jensen, Stefan Noll, Claire Halliday, Bianca M. Poggianti,
Pascale Jablonka, Alfonso Aragon-Salamanca, Roberto P. Saglia, Nina Nowak,
Anja von der Linden, Gabriella De Lucia, Roser Pello, John Moustakas,
Sebastien Poirier, Steven P. Bamford, Douglas I. Clowe, Julianne J.
Dalcanton, Gregory H. Rudnick, Luc Simard, Simon D. M. White, Dennis Zaritsky | Spectroscopy of clusters in the ESO distant cluster survey (EDisCS).II.
Redshifts, velocity dispersions, and substructure for clusters in the last 15
fields | 31 pages, 23 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20079148 | null | astro-ph | null | AIMS. We present spectroscopic observations of galaxies in 15 survey fields
as part of the ESO Distant Cluster Survey (EDisCS). We determine the redshifts
and velocity dispersions of the galaxy clusters located in these fields, and we
test for possible substructure in the clusters.
METHODS. We obtained multi-object mask spectroscopy using the FORS2
instrument at the VLT. We reduced the data with particular attention to the sky
subtraction. We implemented the method of Kelson for performing sky subtraction
prior to any rebinning/interpolation of the data. From the measured galaxy
redshifts, we determine cluster velocity dispersions using the biweight
estimator and test for possible substructure in the clusters using the
Dressler-Shectman test.
RESULTS. The method of subtracting the sky prior to any
rebinning/interpolation of the data delivers photon-noise-limited results,
whereas the traditional method of subtracting the sky after the data have been
rebinned/interpolated results in substantially larger noise for spectra from
tilted slits. Redshifts for individual galaxies are presented and redshifts and
velocity dispersions are presented for 21 galaxy clusters. For the 9 clusters
with at least 20 spectroscopically confirmed members, we present the
statistical significance of the presence of substructure obtained from the
Dressler-Shectman test, and substructure is detected in two of the clusters.
CONCLUSIONS. Together with data from our previous paper, spectroscopy and
spectroscopic velocity dispersions are now available for 26 EDisCS clusters
with redshifts in the range 0.40-0.96 and velocity dispersions in the range
166-1080 km/s.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:37:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Milvang-Jensen",
"Bo",
""
],
[
"Noll",
"Stefan",
""
],
[
"Halliday",
"Claire",
""
],
[
"Poggianti",
"Bianca M.",
""
],
[
"Jablonka",
"Pascale",
""
],
[
"Aragon-Salamanca",
"Alfonso",
""
],
[
"Saglia",
"Roberto P.",
""
],
[
"Nowak",
"Nina",
""
],
[
"von der Linden",
"Anja",
""
],
[
"De Lucia",
"Gabriella",
""
],
[
"Pello",
"Roser",
""
],
[
"Moustakas",
"John",
""
],
[
"Poirier",
"Sebastien",
""
],
[
"Bamford",
"Steven P.",
""
],
[
"Clowe",
"Douglas I.",
""
],
[
"Dalcanton",
"Julianne J.",
""
],
[
"Rudnick",
"Gregory H.",
""
],
[
"Simard",
"Luc",
""
],
[
"White",
"Simon D. M.",
""
],
[
"Zaritsky",
"Dennis",
""
]
] | [
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] |
802.015 | Juan C. Agudelo | Juan C. Agudelo and Walter Carnielli | Paraconsistent Machines and their Relation to Quantum Computing | We chage the title of the paper (to be more appropriate) and add some
lines clarifying our points | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a method to axiomatize computations in deterministic Turing
machines. When applied to computations in non-deterministic Turing machines,
this method may produce contradictory (and therefore trivial) theories,
considering classical logic as the underlying logic. By substituting in such
theories the underlying logic by a paraconsistent logic we define a new
computation model, the paraconsistent Turing machine. This model allows a
partial simulation of superposed states of quantum computing. Such a feature
allows the definition of paraconsistent algorithms which solve (with some
restrictions) the well-known Deutsch's and Deutsch-Jozsa problems. This first
model of computation, however, does not adequately represent the notions of
entangled states and relative phase, which are key features in quantum
computing. In this way, a more sharpened model of paraconsistent Turing
machines is defined, which better approaches quantum computing features.
Finally, we define complexity classes for such models, and establish some
relationships with classical complexity classes.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:59:11 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Jul 2008 13:01:10 GMT"
}
] | 2008-07-27T00:00:00 | [
[
"Agudelo",
"Juan C.",
""
],
[
"Carnielli",
"Walter",
""
]
] | [
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802.0151 | Albert Bosma | E. Athanassoula | Boxy/peanut and discy bulges : formation, evolution and properties | 10 pages, 5 figures, invited review for IAU Symposium 245 "Galactic
bulges", M. Bureau et al. eds | null | null | null | astro-ph | null | The class `bulges' contains objects with very different formation and
evolution paths and very different properties. I review two types of `bulges',
the boxy/peanut bulges (B/Ps) and the discy bulges. The former are parts of
bars seen edge-on, have their origin in vertical instabilities of the disc and
are somewhat shorter in extent than bars. Their stellar population is similar
to that of the inner part of the disc from which they formed. Discy bulges have
a disc-like outline, i.e., seen face-on they are circular or oval and seen
edge-on they are thin. Their extent is of the order of 5 times smaller than
that of the boxy/peanut bulges. They form from the inflow of mainly gaseous
material to the centre of the galaxy and from subsequent star formation. They
thus contain a lot of young stars and gas. Bulges of different types often
coexist in the same galaxy. I review the main known results on these two types
of bulges and present new simulation results. B/Ps form about 1Gyr after the
bar, via a vertical buckling. At that time the bar strength decreases, its
inner part becomes thicker -- forming the peanut or boxy shape -- and the ratio
$\sigma_z^2/\sigma_r^2$ increases. A second buckling episode is seen in
simulations with strong bars, also accompanied by a thickening of the peanut
and a weakening of the bar. The properties of the B/Ps correlate strongly with
those of the bar: stronger bars have stronger peanuts, a more flat-topped
vertical density distribution and have experienced more bucklings. I also
present simulations of disc galaxy formation, which include the formation of a
discy bulge. Decomposition of their radial density profile into an exponential
disc and a Sersic bulge gives realistic values for the disc and bulge
scale-lengths and mass ratios, and a Sersic shape index of the order of 1.
| [
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"version": "v1",
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802.0152 | Michael F. Bietenholz | M. F. Bietenholz and N. Bartel | The Expansion and Radio Spectral Index of G21.5-0.9: Is PSR J1833-1034
the Youngest Pulsar? | Accepted for publication in the MNRAS. 8 pages; For an animation
showing the expansion of G21.5-0.9, see
http://www.yorku.ca/bartel/G21new.html . (The only change in V3 of the
preprint is to add the above url) | null | 10.1111/j.1365-2966.2008.13058.x | null | astro-ph | null | We report on new 5-GHz VLA radio observations of the pulsar-powered supernova
remnant G21.5-0.9. These observations have allowed us to make a high-quality
radio image of this remnant with a resolution of ~0.7". It has a filamentary
structure similar to that seen in the Crab Nebula. Radio structure suggestive
of the torus seen around the Crab pulsar is tentatively identified. We also
compared the new image with one taken ~15 yr earlier at 1.5 GHz, both to find
the expansion speed of the remnant and to make a spectral index image. Between
1991 and 2006, we find that the average expansion rate of the remnant is 0.11
+/- 0.02 %/year, corresponding, for a distance of 5 kpc, to a speed of 910 +/-
160 km/s wrt. the centre of the nebula. Assuming undecelerated expansion, this
expansion speed implies that the age of G21.5-0.9 is 870 (+200,-150) yr, which
makes PSR J1833-1034 one of the youngest, if not the youngest, known pulsars in
the Galaxy.
| [
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"version": "v1",
"created": "Fri, 1 Feb 2008 16:25:29 GMT"
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{
"version": "v2",
"created": "Mon, 4 Feb 2008 14:56:52 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Feb 2008 16:01:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bietenholz",
"M. F.",
""
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"Bartel",
"N.",
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] |
802.0153 | Alberto Alonso | A. Alonso-Izquierdo, J. Mateos Guilarte | Generalized MSTB Models: Structure and kink varieties | 46 pages, 18 figures, corrected typos | Physica D237:3263-3291,2008 | 10.1016/j.physd.2008.07.020 | null | nlin.PS hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we describe the structure of a class of two-component scalar
field models in a (1+1) Minkowskian space-time which generalize the well-known
Montonen-Sarker-Trullinger-Bishop -hence MSTB- model. This class includes all
the field models whose static field equations are equivalent to the Newton
equations of two-dimensional type I Liouville mechanical systems with a
discrete set of instability points. We offer a systematic procedure to
characterize these models and to identify the solitary wave or kink solutions
as homoclinic or heteroclinic trajectories in the analogous mechanical system.
This procedure is applied to a one-parametric family of generalized MSTB models
with a degree-eight polynomial as potential energy density.
| [
{
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},
{
"version": "v2",
"created": "Fri, 28 May 2010 12:05:06 GMT"
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] | 2014-11-18T00:00:00 | [
[
"Alonso-Izquierdo",
"A.",
""
],
[
"Guilarte",
"J. Mateos",
""
]
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802.0154 | Christoph Tschalaer | C. Tschalaer | The Relativistic Stern-Gerlach Force | In this revised version of the paper, the Stern-Gerlach component of
the canonical momentum is treated as velocity-independent in analogy to the
electromagnetic momentum, and its time derivative is simplified by inserting
the known time derivative of the spin | null | null | B/IR#06-02 | physics.acc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic Lagrangian for a spinning particle in an electromagnetic
field is derived from the known Lagrangian in the particle's rest frame. The
resulting relativistic Stern-Gerlach and Thomas precession forces on the
particle are then derived from the Lagrangian in the laboratory frame. In
particular, the longitudinal component of this combined Stern-Gerlach-Thomas
force does not contain a term proportional to gamma-squared as was claimed in a
previous derivation [1].
| [
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"created": "Mon, 25 Aug 2008 16:38:03 GMT"
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"version": "v3",
"created": "Thu, 22 Oct 2009 16:00:02 GMT"
},
{
"version": "v4",
"created": "Thu, 14 Jan 2010 16:41:39 GMT"
},
{
"version": "v5",
"created": "Wed, 10 Aug 2011 16:20:46 GMT"
},
{
"version": "v6",
"created": "Wed, 23 Oct 2013 15:36:09 GMT"
}
] | 2013-10-24T00:00:00 | [
[
"Tschalaer",
"C.",
""
]
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802.0155 | Albert Bosma | E. Athanassoula | Topics on bar and bulge formation and evolution | 4 pages, 2 figures, contributed paper to the Rome meeting on
"Formation and Evolution of Galaxy Disks", eds, J. Funes, S.J. and E.M.
Corsini | null | null | null | astro-ph | null | I discuss results from the COSMOS survey, showing that the fraction of disc
galaxies that is barred decreases considerably with look-back time from z ~ 0.2
to z ~ 0.8. This decrease is more important for small mass and low luminosity
spirals. Classical bar formation theory provides a promising framework for
understanding these results.
I also discuss the formation of discy bulges using N-body simulations
reproducing well the properties of observed discy bulges. Thus, these simulated
discy bulges have the shape of a disc, they have Sersic profiles with small
values of the shape index and their size is of the order of a kpc. They are
formed by radial inflow of material driven by the bar and are thus composed of
both gas and stars and have a considerable fraction of young stars. They can
harbour spiral structure, or an inner bar.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 16:19:08 GMT"
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] | 2008-02-04T00:00:00 | [
[
"Athanassoula",
"E.",
""
]
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] |
802.0156 | Alexander Usvyatsov | Alexander Usvyatsov | Generic separable metric structures | null | null | null | null | math.LO math.GN | null | We compare three notions of genericity of separable metric structures. Our
analysis provides a general model theoretic technique of showing that
structures are generic in descriptive set theoretic (topological) sense and in
measure theoretic sense.
In particular, it gives a new perspective on Vershik's theorems on genericity
and randomness of Urysohn's space among separable metric spaces.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 16:26:18 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Usvyatsov",
"Alexander",
""
]
] | [
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] |
802.0157 | Roberto Giambo' | Roberto Giamb\'o, Fabio Giannoni, Giulio Magli | The dynamical behaviour of homogeneous scalar-field spacetimes with
general self-interaction potentials | 9 pages, 2 figures; some typos corrected, final discussion added | Gen.Rel.Grav.41:21-30,2009 | 10.1007/s10714-008-0647-z | null | gr-qc | null | The dynamics of homogeneous Robertson--Walker cosmological models with a
self-interacting scalar field source is examined here in full generality,
requiring only the scalar field potential to be bounded from below and
divergent when the field diverges. In this way we are able to give a unified
treatment of all the already studied cases - such as positive potentials which
exhibit asymptotically polynomial or exponential behaviors - together with its
extension to a much wider set of physically sensible potentials. Since the set
includes potentials with negative inferior bound, we are able to give, in
particular, the analysis of the asymptotically anti De Sitter states for such
cosmologies.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 16:27:44 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Apr 2008 06:36:01 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Giambó",
"Roberto",
""
],
[
"Giannoni",
"Fabio",
""
],
[
"Magli",
"Giulio",
""
]
] | [
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] |
802.0158 | Albert Bosma | E. Athanassoula, I. Martinez-Valpuesta | Boxy/peanut bulges : formation, evolution and properties | 7 pages, 3 figures, contribution to the conference "Chaos in
Astronomy", Athens, sept. 2007, eds. G. Contopoulos & P.A. Patsis | null | 10.1007/978-3-540-75826-6_7 | null | astro-ph | null | We discuss the formation and evolution of boxy/peanut bulges (B/Ps) and
present new simulations results. Orbital structure studies show that B/Ps are
parts of bars seen edge-on, they have their origin in vertical instabilities of
the disc material and they are somewhat shorter in extent than bars. When the
bar forms it is vertically thin, but after a time of the order of a Gyr it
experiences a vertical instability and buckles. At that time the strength of
the bar decreases, its inner part becomes thicker, so that, seen edge-on, it
acquires a peanut or boxy shape. A second buckling episode is seen in
simulations with strong bars, accompanied by a further thickening of the B/P
and a weakening of the bar. Quantitatively, this evolution depends considerably
on the properties of the halo and particularly on the extent of its core. This
influences the amount of angular momentum exchanged within the galaxy, emitted
by near-resonant material in the bar region and absorbed by near-resonant
material in the halo and in the outer disc. Haloes with small cores generally
harbour stronger bars and B/Ps and they often witness double buckling.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 16:28:02 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 10:53:06 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Athanassoula",
"E.",
""
],
[
"Martinez-Valpuesta",
"I.",
""
]
] | [
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] |
802.0159 | Alberto Saracco | Alberto Saracco, Giuseppe Tomassini | Cohomology and removable subsets | 17 pages, 2 figures | null | null | null | math.CV | null | Let X be a (connected and reduced) complex space. A q-collar of X is a
bounded domain whose boundary is a union of a strongly q-pseudoconvex, a
strongly q-pseudoncave and two flat (i.e. locally zero sets of pluriharmonic
functions) hypersurfaces. Finiteness and vanishing cohomology theorems obtained
in math/0503490 and math/0701549 for semi q-coronae are generalized in this
context and lead to results on extension problem and removable sets for
sections of coherent sheaves and analytic subsets.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 16:35:42 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Saracco",
"Alberto",
""
],
[
"Tomassini",
"Giuseppe",
""
]
] | [
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] |
802.016 | Daniel Errandonea | Daniel Errandonea, Francisco Javier Manjon | Pressure effects on the structural and electronic properties of ABX4
scintillating crystals | 137 pages, 20 figures, 10 Tables | Progress in Materials Science 53, 711 (2008) | 10.1016/j.pmatsci.2008.02.001 | null | cond-mat.mtrl-sci | null | Studies at high pressures and temperatures are helpful for understanding the
physical properties of the solid state, including such classes of materials as,
metals, semiconductors, superconductors, or minerals. In particular, the phase
behaviour of ABX4 scintillating materials is a challenging problem with many
implications for other fields including technological applications and Earth
and planetary sciences. A great progress has been done in the last years in the
study of the pressure-effects on the structural and electronic properties of
these compounds. In particular, the high-pressure structural sequence followed
by these compounds seems now to be better understood thanks to recent
experimental and theoretical studies. Here, we will review studies on the phase
behaviour of different ABX4 scintillating materials. In particular, we will
focus on discussing the results obtained by different groups for the
scheelite-structured orthotungstates, which have been extensively studied up to
50 GPa. We will also describe different experimental techniques for obtaining
reliable data at simultaneously high pressure and high temperature. Drawbacks
and advantages of the different techniques are discussed along with recent
developments involving synchrotron x-ray diffraction, Raman scattering, and ab
initio calculations. Differences and similarities of the phase behaviour of
these materials will be discussed, on the light of the Fukunaga and Yamaoka and
the Bastide diagrams, aiming to improve the actual understanding of their
high-pressure behaviour. Possible technological and geophysical implications of
the reviewed results will be also commented.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:57:36 GMT"
}
] | 2008-06-02T00:00:00 | [
[
"Errandonea",
"Daniel",
""
],
[
"Manjon",
"Francisco Javier",
""
]
] | [
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] |
802.0161 | Alan D. Martin | Alan D. Martin | Proton structure, Partons, QCD, DGLAP and beyond | 35 pages, 19 figures, to appear in Proc. of School on QCD, low x
physics, saturation and diffraction, Copanello, Calabria, Italy, July 2007,
to be published in Acta Physica Polonica | Acta Phys.Polon.B39:2025-2062,2008 | null | IPPP/08/03, DCPT/08/06 | hep-ph | null | We present an introductory discussion of deep-inelastic lepton-proton
scattering as a means to probe the substructure of the proton. A resume of QCD
is given, emphasizing the running of the coupling constant and the DGLAP
evolution equations for the parton densities. The determination of parton
distributions is discussed and their importance for predictions of processes at
the LHC is emphasized. Going beyond the pure DGLAP regime, we briefly discuss
the behaviour of parton densities at low x, and the evidence for non-linear
absorptive contributions.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 16:49:50 GMT"
}
] | 2010-03-25T00:00:00 | [
[
"Martin",
"Alan D.",
""
]
] | [
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] |
802.0162 | Raf Bocklandt | Raf Bocklandt, Travis Schedler, Michael Wemyss | Superpotentials and Higher Order Derivations | 23 pages | null | null | null | math.RA | null | We consider algebras defined from quivers with relations that are k-th order
derivations of a superpotential, generalizing results of Dubois-Violette to the
quiver case. We give a construction compatible with Morita equivalence, and
show that many important algebras arise in this way, including McKay
correspondence algebras for GL_n for all n, and four-dimensional Sklyanin
algebras. More generally, we show that any N-Koszul, (twisted) Calabi-Yau
algebra must have a (twisted) superpotential, and construct its minimal
resolution in terms of derivations of the (twisted) superpotential. This yields
an equivalence between N-Koszul twisted Calabi-Yau algebras A and algebras
defined by a superpotential such that an associated complex is a bimodule
resolution of A. Finally, we apply these results to give a description of the
moduli space of four-dimensional Sklyanin algebras using the Weil
representation of SL_2(Z/4).
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:06:30 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 17:29:51 GMT"
},
{
"version": "v3",
"created": "Mon, 12 May 2008 08:14:31 GMT"
}
] | 2008-05-12T00:00:00 | [
[
"Bocklandt",
"Raf",
""
],
[
"Schedler",
"Travis",
""
],
[
"Wemyss",
"Michael",
""
]
] | [
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] |
802.0163 | Andrzej Derdzinski | Andrzej Derdzinski (Ohio State University) | Connections with skew-symmetric Ricci tensor on surfaces | 22 pages | Results in Mathematics - Resultate der Mathematik, vol. 52 (2008),
no. 3-4, pp. 223-245 | 10.1007/s00025-008-0307-3 | null | math.DG | null | Some known results on torsionfree connections with skew-symmetric Ricci
tensor on surfaces are extended to connections with torsion, and Wong's
canonical coordinate form of such connections is simplified.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 16:53:30 GMT"
}
] | 2011-06-07T00:00:00 | [
[
"Derdzinski",
"Andrzej",
"",
"Ohio State University"
]
] | [
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] |
802.0164 | Jean-Marc Richard | Xavier Artru, Mokhtar Elchikh, Jean-Marc Richard, Jacques Soffer, Oleg
V. Teryaev | Spin observables and spin structure functions: inequalities and dynamics | 135 pages, 37 figures, pdflatex, to appear in Physics Reports, new
subsections added, typos corrected, references added | Physics Reports 470 (2009) 1-92 | 10.1016/j.physrep.2008.09.004 | LPSC-08-08, LYCEN-2008-1 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Model-independent identities and inequalities relating the various spin
observables of a reaction are reviewed in a unified formalism, together with
their implications for dynamical models, their physical interpretation, and the
quantum aspects of the information carried by spins, in particular
entanglement. These constraints between observables can be obtained from the
explicit expression of the observables in terms of a set of amplitudes, a
non-trivial algebraic exercise which can be preceded by numerical simulation
with randomly chosen amplitudes, from anticommutation relations, or from the
requirement that any polarisation vector is less than unity. The most powerful
tool is the positivity of the density matrices describing the reaction or its
crossed channels, with a projection to single out correlations between two or
three observables. For the exclusive reactions, the cases of the
strangeness-exchange proton-antiproton scattering and the photoproduction of
pseudoscalar mesons are treated in some detail: all triples of observables are
constrained, and new results are presented for the allowed domains. The
positivity constraints for total cross-sections and single-particle inclusive
reactions are reviewed, with application to spin-dependent structure functions
and parton distributions. The corresponding inequalities are shown to be
preserved by the evolution equations of QCD.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 15:27:29 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Oct 2008 14:15:10 GMT"
}
] | 2009-01-14T00:00:00 | [
[
"Artru",
"Xavier",
""
],
[
"Elchikh",
"Mokhtar",
""
],
[
"Richard",
"Jean-Marc",
""
],
[
"Soffer",
"Jacques",
""
],
[
"Teryaev",
"Oleg V.",
""
]
] | [
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802.0165 | Jean-Marc Couveignes | Jean-Marc Couveignes and Reynald Lercier | Elliptic periods for finite fields | null | Finite Fields and their Applications, 15(2009), pages 1--22 | 10.1016/j.ffa.2008.07.004 | null | math.NT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct two new families of basis for finite field extensions. Basis in
the first family, the so-called elliptic basis, are not quite normal basis, but
they allow very fast Frobenius exponentiation while preserving sparse
multiplication formulas. Basis in the second family, the so-called normal
elliptic basis are normal basis and allow fast (quasi linear) arithmetic. We
prove that all extensions admit models of this kind.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:41:27 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jun 2008 08:37:03 GMT"
}
] | 2012-05-07T00:00:00 | [
[
"Couveignes",
"Jean-Marc",
""
],
[
"Lercier",
"Reynald",
""
]
] | [
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] |
802.0166 | Charlene Kalle | Karma Dajani and Charlene Kalle | Two versions of a specific natural extension | 12 pages, 3 figures | null | null | null | math.DS | null | We give two versions of the natural extension of a specific greedy
beta-transformation with deleted digits. We use the natural extension to obtain
an explicit expression for the invariant measure, equivalent to the Lebesgue
measure, of this beta-transformation.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:10:47 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Dajani",
"Karma",
""
],
[
"Kalle",
"Charlene",
""
]
] | [
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802.0167 | Noam Soker | Amit Kashi, Noam Soker (Technion, Israel) | Possible Implications of Mass Accretion in Eta Carinae | New Astronomy, in press | New Astron.14:11-24,2008 | 10.1016/j.newast.2008.04.003 | null | astro-ph | null | We apply the previously suggested accretion model for the behavior of the
super-massive binary system Eta Carinae close to periastron passages. In that
model it is assumed that for ~10 weeks near periastron passages one star is
accreting mass from the slow dense wind blown by the other star. We find that
the secondary, the less massive star, accretes ~2x10^{-6}Mo. This mass
possesses enough angular momentum to form a disk, or a belt, around the
secondary. The viscous time is too long for the establishment of equilibrium,
and the belt must be dissipated as its mass is being blown in the reestablished
secondary wind. This processes requires about half a year, which we identify
with the recovery phase of Eta Carinae. We show that radiation pressure, termed
radiative braking, cannot prevent accretion. In addition to using the commonly
assumed binary model for Eta Carinae, we also examine alternative models where
the stellar masses are larger, and/or the less massive secondary blows the slow
dense wind, while the primary blows the tenuous fast wind and accretes mass for
~10 weeks near periastron passages. We end by some predictions for the next
event (January-March 2009).
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:14:06 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Apr 2008 16:08:11 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Kashi",
"Amit",
"",
"Technion, Israel"
],
[
"Soker",
"Noam",
"",
"Technion, Israel"
]
] | [
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] |
802.0168 | Comelli Denis | M. Ciafaloni, P. Ciafaloni, D. Comelli | Electroweak double-logs at small x | 10 pages, 4 figures | JHEP 0805:039,2008 | 10.1088/1126-6708/2008/05/039 | null | hep-ph | null | We investigate enhanced EW corrections to inclusive hard processes in the TeV
energy region with emphasis on the small-x situation, in which the hard scale Q
is significantly smaller than the available energy \sqrt{s}= Q/x. We first
propose and justify a general factorization formula in which the (double-log)
EW form factor at scale Q^2 is factorized from EW parton distribution
functions, which satisfy evolution equations of DGLAP type. We then investigate
the small-x behavior of the EW parton distributions including the novel ones
for non-vanishing t-channel weak isospin T and we compare it with a BFKL-type
approach. In either approach we find that large small-x corrections of order
\alpha_w \log x \log Q^2/M^2 (M being the EW symmetry breaking scale) are
present only for T=2 and not for T=1. This implies that only transverse WW
interactions (coupled to T=2) are affected, while the T=1 components feel just
the form factor at scale Q^2.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:30:02 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Ciafaloni",
"M.",
""
],
[
"Ciafaloni",
"P.",
""
],
[
"Comelli",
"D.",
""
]
] | [
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] |
802.0169 | Mattias Marklund | G. Brodin, M. Marklund, G. Manfredi | Quantum plasma effects in the classical regime | 10 pages, 1 figure | null | 10.1103/PhysRevLett.100.175001 | null | quant-ph | null | For quantum effects to be significant in plasmas it is often assumed that the
temperature over density ratio must be small. In this paper we challenge this
assumption by considering the contribution to the dynamics from the electron
spin properties. As a starting point we consider a multicomponent plasma model,
where electrons with spin up and spin down are regarded as different fluids. By
studying the propagation of Alfv\'{e}n wave solitons we demonstrate that
quantum effects can survive in a relatively high-temperature plasma. The
consequences of our results are discussed.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:54:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brodin",
"G.",
""
],
[
"Marklund",
"M.",
""
],
[
"Manfredi",
"G.",
""
]
] | [
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] |
802.017 | Nigel Cundy Dr | Nigel Cundy | New solutions to the Ginsparg-Wilson equation | 14 pages, 3 figures; v2 typos corrected, references and small
additional section added; v3 major changes to the introduction and concluding
sections; some typos corrected; to appear in Nucl. Phys. B | Nucl.Phys.B802:92-105,2008 | 10.1016/j.nuclphysb.2008.05.004 | null | hep-lat | null | The overlap operator is just the simplest of a class of Dirac operators with
an exact chiral symmetry. I demonstrate how a general class of chiral Dirac
operators can be constructed, show that they have no fermion doublers and that
they are all exponentially local, and test my conclusions numerically for a few
examples. However, since these operators are more expensive than the overlap
operator, it is unlikely that they will be useful in practical simulations.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:26:49 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 15:54:56 GMT"
},
{
"version": "v3",
"created": "Wed, 14 May 2008 18:47:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cundy",
"Nigel",
""
]
] | [
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802.0171 | Bernd Kniehl | Joachim Brod, Frank Fugel, and Bernd A. Kniehl | Dominant two-loop electroweak corrections to the hadroproduction of a
pseudoscalar Higgs boson and its photonic decay | 9 pages, 3 figures | Phys.Rev.D78:011303,2008 | 10.1103/PhysRevD.78.011303 | DESY 08-010, TTP08-05, SFB/CPP-08-10 | hep-ph | null | We present the dominant two-loop electroweak corrections to the partial decay
widths to gluon jets and prompt photons of the neutral CP-odd Higgs boson A^0,
with mass M_{A^0} < 2 M_W, in the two-Higgs-doublet model for low to
intermediate values of the ratio tan(beta) = v_2/v_1 of the vacuum expectation
values. They apply as they stand to the production cross sections in hadronic
and two-photon collisions, at the Tevatron, the LHC, and a future photon
collider. The appearance of three gamma_5 matrices in closed fermion loops
requires special care in the dimensional regularization of ultraviolet
divergences. The corrections are negative and amount to several percent, so
that they fully compensate or partly screen the enhancement due to QCD
corrections.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:27:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brod",
"Joachim",
""
],
[
"Fugel",
"Frank",
""
],
[
"Kniehl",
"Bernd A.",
""
]
] | [
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] |
802.0172 | Alexander Plyukhin V | A.V. Plyukhin | Generalized Fokker-Planck equation, Brownian motion, and ergodicity | null | Phys. Rev. E 77, 061136 (2008) | 10.1103/PhysRevE.77.061136 | null | cond-mat.stat-mech math.DS | null | Microscopic theory of Brownian motion of a particle of mass $M$ in a bath of
molecules of mass $m\ll M$ is considered beyond lowest order in the mass ratio
$m/M$. The corresponding Langevin equation contains nonlinear corrections to
the dissipative force, and the generalized Fokker-Planck equation involves
derivatives of order higher than two. These equations are derived from first
principles with coefficients expressed in terms of correlation functions of
microscopic force on the particle. The coefficients are evaluated explicitly
for a generalized Rayleigh model with a finite time of molecule-particle
collisions. In the limit of a low-density bath, we recover the results obtained
previously for a model with instantaneous binary collisions. In general case,
the equations contain additional corrections, quadratic in bath density,
originating from a finite collision time. These corrections survive to order
$(m/M)^2$ and are found to make the stationary distribution non-Maxwellian.
Some relevant numerical simulations are also presented.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:27:44 GMT"
},
{
"version": "v2",
"created": "Wed, 28 May 2008 19:51:50 GMT"
},
{
"version": "v3",
"created": "Wed, 28 May 2008 20:02:48 GMT"
}
] | 2010-01-22T00:00:00 | [
[
"Plyukhin",
"A. V.",
""
]
] | [
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] |
802.0173 | Haisheng Li Dr. | Haisheng Li and Qing Wang | On vertex algebras and their modules associated with even lattices | 24 pages | null | null | null | math.QA | null | We study vertex algebras and their modules associated with possibly
degenerate even lattices, using an approach somewhat different from others.
Several known results are recovered and a number of new results are obtained.
We also study modules for Heisenberg algebras and we classify irreducible
modules satisfying certain conditions and obtain a complete reducibility
theorem.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:29:25 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Li",
"Haisheng",
""
],
[
"Wang",
"Qing",
""
]
] | [
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] |
802.0174 | Pedro Pina Avelino | P. P. Avelino, L.M.G. Beca, C.J.A.P. Martins | Clustering Properties of Dynamical Dark Energy Models | 5 pages | Phys.Rev.D77:101302,2008 | 10.1103/PhysRevD.77.101302 | null | astro-ph | null | We provide a generic but physically clear discussion of the clustering
properties of dark energy models. We explicitly show that in quintessence-type
models the dark energy fluctuations, on scales smaller than the Hubble radius,
are of the order of the perturbations to the Newtonian gravitational potential,
hence necessarily small on cosmological scales. Moreover, comparable
fluctuations are associated with different gauge choices. We also demonstrate
that the often used homogeneous approximation is unrealistic, and that the
so-called dark energy mutation is a trivial artifact of an effective, single
fluid description. Finally, we discuss the particular case where the dark
energy fluid is coupled to dark matter.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:36:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Avelino",
"P. P.",
""
],
[
"Beca",
"L. M. G.",
""
],
[
"Martins",
"C. J. A. P.",
""
]
] | [
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] |
802.0175 | D. M. Alexander | D.M. Alexander | The X-ray-Infrared/Submillimetre Connection and the Legacy Era of
Cosmology | 4 pages, contribution for "XMM-Newton: The Next Decade", AN in press | null | 10.1002/asna.200710895 | null | astro-ph | null | We review some recent results on the identification and characterisation of
Active Galactic Nuclei (AGN) obtained by cross correlating X-ray surveys with
infrared and submillimetre surveys. We also look toward the scientific gains
that could be achieved from an XMM-Newton survey of the medium-deep legacy
fields that are being observed at ~1-850um.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:31:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alexander",
"D. M.",
""
]
] | [
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] |
802.0176 | Abhijit Biswas | Abhijit Biswas and Krishnan R. S. Mani | Relativistic Perihelion Precession of Orbits of Venus and the Earth | 3 pages | Cent. Eur. J. Phys. 6 (2008) 754-758 | 10.2478/s11534-008-0081-6 | null | physics.gen-ph | null | Among all the theories proposed to explain the 'anomalous' perihelion
precession of Mercury's orbit announced in 1859 by Le Verrier, the general
theory of relativity proposed by Einstein in November 1915, alone could
calculate Mercury's 'anomalous' precession with a precision demanded by
observational accuracy. Since Mercury's precession was a directly derived
result of the full general theory, it was viewed by Einstein as the most
critical test of general relativity, amongst the three tests proposed by him.
With the advent of the space age, the observational accuracy level has improved
further and it became possible to detect this precession for other planetary
orbits of the solar system -- viz., Venus and the Earth. This conclusively
proved that the phenomenon of 'anomalous' perihelion precession of planetary
orbits is really a relativistic effect. Our previous papers presented the
mathematical model and the computed value of the relativistic perihelion
precession of Mercury's orbit using an alternate relativistic gravitational
model, which is a remodeled form of Einstein's relativity theories, and which
retained only experimentally proven principles and has been enriched by the
benefits of almost a century-long relativity experimentation including the
space age experiments. Using this model, we present in this paper the computed
values of the relativistic precession of Venus and the Earth, which compare
well with the predictions of general relativity and also are in agreement with
the observed values within the range of uncertainty.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:36:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Biswas",
"Abhijit",
""
],
[
"Mani",
"Krishnan R. S.",
""
]
] | [
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802.0177 | Alan D. Martin | V.A. Khoze, A.D. Martin and M.G. Ryskin | Early LHC measurements to check predictions for central exclusive
production | 28 pages, 12 figures; text clarified, new figure added, version to be
published in Eur. Phys. J. C | Eur.Phys.J.C55:363-375,2008 | 10.1140/epjc/s10052-008-0611-9 | IPPP/08/07, DCPT/08/14 | hep-ph | null | We show how the early data runs of the LHC can provide valuable checks of the
different components of the formalism used to predict the cross sections of
central exclusive processes. The `soft' rapidity gap survival factor can be
studied in electroweak processes, such as W+gaps events, where the bare
amplitude is well known. The generalized gluon distribution, in the appropriate
kinematic region, can be probed by exclusive Upsilon production. The
perturbative QCD effects, especially the Sudakov-like factor, can be probed by
exclusive two- and three-jet production. We discuss the possible role of
enhanced absorptive corrections which would violate the soft-hard factorization
implied in the usual formalism, and suggest ways that the LHC may explore their
presence.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 17:47:49 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 11:08:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | [
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802.0178 | Nanda Rea | A. Possenti (INAF), N. Rea (Amsterdam), M. A. McLaughlin (WVU), F.
Camilo (Columbia), M. Kramer (JBO), M. Burgay (INAF), B.C. Joshi (NCRA-TIFR),
A. G. Lyne (JBO) | The very soft X-ray spectrum of the Double Pulsar System J0737-3039 | 12 pages. Accepted for publication in ApJ | null | 10.1086/587950 | null | astro-ph | null | We present the results of an 80 ks Chandra ACIS-S observation of the double
pulsar system J0737-3039. Furthermore, we report on spectral, spatial and
timing analysis of the combined X-ray observations performed so far for this
system. Fitting a total of ~1100 photons, we show that the X-ray spectrum of
the J0737-3039 system is very soft, and not satisfactorily modeled by a simple
blackbody or an atmospheric model. However, it is not possible yet to
discriminate between a predominantly non-thermal and a predominantly thermal
origin for the X-ray emission. Adopting a simple power-law emission model, the
photon index (Gamma=3.7) and the implied conversion efficiency of the
rotational energy of PSR J0737-3039A into X-ray emission (4.1x10^-4, for a
distance to the source of 500 pc) are compatible with the X-ray photons being
emitted in the magnetosphere of PSR J0737-3039A. This hypothesis is also
supported by the absence of detectable X-ray orbital modulation (up to ~20%) or
any X-ray nebular emission and it is in agreement with the high (~75%) X-ray
pulsed fraction of PSR J0737-3039A. A two blackbody or a Comptonized blackbody
model also reproduce the data, and the upper limit to the value of the hydrogen
column density N_H <10^20 cm^-2, is in better agreement (with respect to the
power-law model) with the Galactic N_H in that direction and at that distance.
For the two blackbody model the implied emission radii and temperatures are
also compatible with those seen in other recycled pulsars, calling for the bulk
of the X-ray photons being originated from heated regions at the surface of
pulsar A. On the other hand, in the Comptonized blackbody model, the electron
temperature seems to be significantly smaller than in other similar objects.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 20:57:58 GMT"
},
{
"version": "v2",
"created": "Sun, 3 Feb 2008 17:29:46 GMT"
},
{
"version": "v3",
"created": "Mon, 25 Feb 2008 10:07:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Possenti",
"A.",
"",
"INAF"
],
[
"Rea",
"N.",
"",
"Amsterdam"
],
[
"McLaughlin",
"M. A.",
"",
"WVU"
],
[
"Camilo",
"F.",
"",
"Columbia"
],
[
"Kramer",
"M.",
"",
"JBO"
],
[
"Burgay",
"M.",
"",
"INAF"
],
[
"Joshi",
"B. C.",
"",
"NCRA-TIFR"
],
[
"Lyne",
"A. G.",
"",
"JBO"
]
] | [
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] |
802.0179 | Salim El Rouayheb | Salim El Rouayheb, Alex Sprintson, Costas Georghiades | On the Relation Between the Index Coding and the Network Coding Problems | null | null | null | null | cs.IT math.IT | null | In this paper we show that the Index Coding problem captures several
important properties of the more general Network Coding problem. An instance of
the Index Coding problem includes a server that holds a set of information
messages $X=\{x_1,...,x_k\}$ and a set of receivers $R$. Each receiver has some
side information, known to the server, represented by a subset of $X$ and
demands another subset of $X$. The server uses a noiseless communication
channel to broadcast encodings of messages in $X$ to satisfy the receivers'
demands. The goal of the server is to find an encoding scheme that requires the
minimum number of transmissions.
We show that any instance of the Network Coding problem can be efficiently
reduced to an instance of the Index Coding problem. Our reduction shows that
several important properties of the Network Coding problem carry over to the
Index Coding problem. In particular, we prove that both scalar linear and
vector linear codes are insufficient for achieving the minimal number of
transmissions.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 20:02:06 GMT"
},
{
"version": "v2",
"created": "Mon, 12 May 2008 19:15:36 GMT"
}
] | 2008-05-12T00:00:00 | [
[
"Rouayheb",
"Salim El",
""
],
[
"Sprintson",
"Alex",
""
],
[
"Georghiades",
"Costas",
""
]
] | [
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] |
802.018 | James Dent | James B. Dent, Pasquale L. Iafelice, Thomas W. Kephart | Modified Pati-Salam Model from $Z_7$ orbifolded AdS/CFT | 8 pages, 1 figure, Phenomenology section revised to correct
renormalization group equations, typos corrected | Phys.Lett.B663:416-418,2008 | 10.1016/j.physletb.2008.04.018 | null | hep-ph | null | We consider models built on $AdS_5\otimes S^5/\Gamma$ orbifold
compactifications of the type $IIB$ superstring, where $\Gamma$ is the abelian
group $Z_n$. An attractive three family $\mathcal{N}=0$ SUSY model is found for
$n=7$ that is a modified Pati--Salam Model which reduced to the Standard Model
after symmetry breaking.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 18:27:56 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Mar 2008 19:54:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dent",
"James B.",
""
],
[
"Iafelice",
"Pasquale L.",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | [
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] |
802.0181 | Alexander Plyukhin V | A.V. Plyukhin | Quasi-one-dimensional disordered systems: fluctuations, transport and
interplay | proceedings of TIDS12, to be published in Phys. Stat. Sol.(c) | Phys. Stat. Sol.(c) 5, 759 (2008) | 10.1002/pssc.200777579 | null | cond-mat.soft cond-mat.dis-nn | null | In a one dimensional lattice thermal fluctuations destroy the long-range
order making particles of the lattice move on a scale much larger than the
lattice spacing. We discuss the assumption that this motion may be responsible
for the transport of localized electrons in a system of weakly coupled chains.
The model with diffusing localization sites gives a temperature-independent
mobility with a crossover to an activated dependence at high temperature. This
prediction is consistent with and might account for experimental results on
discotic liquid crystals and certain biopolymers.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 18:44:45 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Plyukhin",
"A. V.",
""
]
] | [
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] |
802.0182 | Daniel Katz | Daniel Katz | On sumfree subsets of hypercubes | 18 pages, 4 figures; lower bound result corrected | null | 10.4064/aa137-2-3 | null | math.NT math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possible sizes of large sumfree sets contained in the
discrete hypercube $\{1,...,n\}^k$, and we determine upper and lower bounds for
the maximal size as $n$ becomes large. We also discuss a continuous analogue in
which our lower bound remains valid and our upper bound can be strengthened,
and we consider the generalization of both problems to $l$-fold-sumfree sets.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:01:27 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jun 2008 21:45:02 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Katz",
"Daniel",
""
]
] | [
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] |
802.0183 | Michael Bateman | Michael Bateman | L^p Estimates for Maximal Averages Along One-variable Vector Fields in
R^2 | 10 pages | null | null | null | math.CA | null | We prove a conjecture of Lacey and Li in the case that the vector field
depends only on one variable. Specifically: let v be a vector field defined on
the unit square such that v(x,y) = (1,u(x)) for some measurable u from [0,1] to
[0,1]. Fix a small parameter delta and let Z be the collection of rectangles R
of a fixed width such that delta much of the vector field inside R is pointed
in (approximately) the same direction as R. We show that the maximal averaging
operator associated to the collection Z is bounded on L^p for p>1 with
constants comparable to (delta)^(-1) .
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 18:59:42 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Bateman",
"Michael",
""
]
] | [
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802.0184 | Taras V. Skrypnyk | Taras V. Skrypnyk | Classical R-Operators and Integrable Generalizations of Thirring
Equations | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4:011,2008 | 10.3842/SIGMA.2008.011 | null | nlin.SI math-ph math.MP | null | We construct different integrable generalizations of the massive Thirring
equations corresponding loop algebras $\widetilde{\mathfrak{g}}^{\sigma}$ in
different gradings and associated ''triangular'' $R$-operators. We consider the
most interesting cases connected with the Coxeter automorphisms, second order
automorphisms and with ''Kostant-Adler-Symes'' $R$-operators. We recover a
known matrix generalization of the complex Thirring equations as a partial case
of our construction.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:00:43 GMT"
}
] | 2008-12-19T00:00:00 | [
[
"Skrypnyk",
"Taras V.",
""
]
] | [
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] |
802.0185 | Lewis Bowen | Lewis Bowen | Free Groups in Lattices | This version corrects a few typos. Version 4 is a major rewrite over
version 3 | Geom. Topol. 13 (2009) 3021-3054 | 10.2140/gt.2009.13.3021 | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let G be any locally compact, unimodular, metrizable group. The main result
of this paper, roughly stated, is that if F<G is any finitely generated free
group and \Gamma < G any lattice, then up to a small perturbation and passing
to a finite index subgroup, F is a subgroup of \Gamma. If G/\Gamma is
noncompact then we require additional hypotheses that include G=SO(n,1).
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:04:49 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Apr 2008 18:48:45 GMT"
},
{
"version": "v3",
"created": "Mon, 26 May 2008 21:47:48 GMT"
},
{
"version": "v4",
"created": "Sun, 26 Oct 2008 23:39:12 GMT"
},
{
"version": "v5",
"created": "Tue, 4 Nov 2008 02:48:57 GMT"
}
] | 2014-11-11T00:00:00 | [
[
"Bowen",
"Lewis",
""
]
] | [
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] |
802.0186 | Alexei Gruverman | A. Gruverman, D. Wu, H.-J. Fan, I. Vrejoiu, M. Alexe, R. J. Harrison,
and J. F. Scott | Vortex Ferroelectric Domains | null | null | null | null | cond-mat.mtrl-sci | null | We show experimental switching data on microscale capacitors of
lead-zirconate-titanate (PZT), which reveal time-resolved domain behavior
during switching on a 100-ns scale. For small circular capacitors, an
unswitched domain remains in the center while complete switching is observed in
square capacitors. The observed effect is attributed to the formation of vortex
domain during polarization switching in circular capacitors. This dynamical
behavior is modeled using the Landau-Liftshitz-Gilbert equations and found to
be in detailed agreement with experiment. This simulation implies rotational
motion of polarization in the xy-plane, a Heisenberg-like result supported by
the recent model of Naumov and Fu [Phys. Rev. Lett. 98, 077603 (2007)],
although not directly measurable by the present quasi-static measurements.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:26:48 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Gruverman",
"A.",
""
],
[
"Wu",
"D.",
""
],
[
"Fan",
"H. -J.",
""
],
[
"Vrejoiu",
"I.",
""
],
[
"Alexe",
"M.",
""
],
[
"Harrison",
"R. J.",
""
],
[
"Scott",
"J. F.",
""
]
] | [
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] |
802.0187 | Piotr Mi{\l}o\'s | Piotr Milos | Occupation time fluctuation limits of infinite variance equilibrium
branching systems | null | null | null | null | math.PR | null | We establish limit theorems for the fluctuations of the rescaled occupation
time of a $(d,\alpha,\beta)$-branching particle system. It consists of
particles moving according to a symmetric $\alpha$-stable motion in
$\mathbb{R}^d$. The branching law is in the domain of attraction of a
(1+$\beta$)-stable law and the initial condition is an equilibrium random
measure for the system (defined below). In the paper we treat separately the
cases of intermediate $\alpha/\beta<d<(1+\beta)\alpha/\beta$, critical
$d=(1+\beta)\alpha/\beta$ and large $d>(1+\beta)\alpha/\beta $ dimensions. In
the most interesting case of intermediate dimensions we obtain a version of a
fractional stable motion. The long-range dependence structure of this process
is also studied. Contrary to this case, limit processes in critical and large
dimensions have independent increments.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:35:06 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Milos",
"Piotr",
""
]
] | [
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802.0188 | J\'er\^ome Feret | J\'er\^ome Feret | Partitioning the Threads of a Mobile System | null | null | null | null | cs.OH | null | In this paper, we show how thread partitioning helps in proving properties of
mobile systems. Thread partitioning consists in gathering the threads of a
mobile system into several classes. The partitioning criterion is left as a
parameter of both the mobility model and the properties we are interested in.
Then, we design a polynomial time abstract interpretation-based static analysis
that counts the number of threads inside each partition class.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:46:39 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Feret",
"Jérôme",
""
]
] | [
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] |
802.0189 | William Hooper Jr | W. Patrick Hooper | Dynamics on an infinite surface with the lattice property | 48 pages, 11 figures | null | null | null | math.DS | null | Dynamical systems on an infinite translation surface with the lattice
property are studied. The geodesic flow on this surface is found to be
recurrent in all but countably many rational directions. Hyperbolic elements of
the affine automorphism group are found to be nonrecurrent, and a precise
formula regarding their action on cylinders is proven. A deformation of the
surface in the space of translation surfaces is found, which "behaves nicely"
with the geodesic flow and action of the affine automorphism group.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:53:17 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Hooper",
"W. Patrick",
""
]
] | [
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] |
802.019 | Jun He | Jun He, Yong-Sheng Zhang, Xiang-Fa Zhou, Qun-Feng Chen, and Guang-Can
Guo | Automated and robust population transfer method for three-level system
using oscillating dark states | null | null | null | null | quant-ph | null | An automated and robust method for adiabatic population transfer and the
preparation of an arbitrary quantum superposition state in atomic system using
the oscillating dark states (ODS) is presented. Quantum state of a three-level
$\Lambda$ configuration atomic system oscillates periodically between two
ground levels, when two pairs of classical detuning laser fields driving the
system into the ODS under evolving adiabatic conditions. The decoherence of the
ODS evolution is greatly suppressed, and the oscillation is very stable,
therefore adiabatic population transfer and the preparation of an arbitrary
quantum superposition state of atomic system can be completed accurately and
conveniently.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 03:44:27 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"He",
"Jun",
""
],
[
"Zhang",
"Yong-Sheng",
""
],
[
"Zhou",
"Xiang-Fa",
""
],
[
"Chen",
"Qun-Feng",
""
],
[
"Guo",
"Guang-Can",
""
]
] | [
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802.0191 | Kostas Triantafyllopoulos | K. Triantafyllopoulos | Covariance estimation for multivariate conditionally Gaussian dynamic
linear models | 21 pages, 2 figures, 6 tables | Journal of Forecasting (2007), 26(8), pp. 551-569. | 10.1002/for.1039 | null | stat.ME stat.AP | null | In multivariate time series, the estimation of the covariance matrix of the
observation innovations plays an important role in forecasting as it enables
the computation of the standardized forecast error vectors as well as it
enables the computation of confidence bounds of the forecasts. We develop an
on-line, non-iterative Bayesian algorithm for estimation and forecasting. It is
empirically found that, for a range of simulated time series, the proposed
covariance estimator has good performance converging to the true values of the
unknown observation covariance matrix. Over a simulated time series, the new
method approximates the correct estimates, produced by a non-sequential Monte
Carlo simulation procedure, which is used here as the gold standard. The
special, but important, vector autoregressive (VAR) and time-varying VAR models
are illustrated by considering London metal exchange data consisting of spot
prices of aluminium, copper, lead and zinc.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 19:48:03 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Triantafyllopoulos",
"K.",
""
]
] | [
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0.0226675272,
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0.0489451587,
-0.0362483971,
-0.0773593783,
0.057614319,
0.0347012095,
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-0.0419459753,
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] |
802.0192 | Grigori Rozenblum | Grigori Rozenblum, Nikolay Shirokov | Finite rank Bergman-Toeplitz and Bargmann-Toeplitz operators in many
dimensions | 9 pages | null | null | null | math.FA math.CV | null | The recent theorem by D. Luecking that finite rank Toeplitz-Bergman operators
must be generated by a measure consisting of finitely many point masses is
carried over to the many-dimensional case.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 20:19:17 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Rozenblum",
"Grigori",
""
],
[
"Shirokov",
"Nikolay",
""
]
] | [
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0.0134360464
] |
802.0193 | Eugene Heifets | Eugene A. Kotomin, Yuri A. Mastrikov, Eugene Heifets and Joachim Maier | First principles modeling of oxygen adsorption on LaMnO3 (001) surface | 5 pages, 2 figures, 3 tables, 24 references, corrected misprint in
author's names | null | null | null | cond-mat.mtrl-sci | null | We present and discuss the results of ab initio DFT plane-wave supercell
calculations of the atomic and molecular oxygen adsorption and diffusion on the
LaMnO3 (001) surface which serves as a model material for a cathode of solid
oxide fuel cells. The dissociative adsorption of O2 molecules from the gas
phase is energetically favorable on surface Mn ions even on a defect-free
surface. The surface migration energy for adsorbed O ions is found to be quite
high, 1.6 eV. We predict that the adsorbed O atoms could penetrate into
electrode first plane when much more mobile surface oxygen vacancies (migration
energy of 0.69 eV) approach the O ions strongly bound to the surface Mn ions.
Ab initio thermodynamics predicts that at typical SOFC operation temperatures
(~1200 K) the MnO2 (001) surface with adsorbed O atoms is the most stable in a
very wide range of oxygen gas pressures (above 10^2 atm).
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 20:21:07 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 20:05:24 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Kotomin",
"Eugene A.",
""
],
[
"Mastrikov",
"Yuri A.",
""
],
[
"Heifets",
"Eugene",
""
],
[
"Maier",
"Joachim",
""
]
] | [
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] |
802.0194 | John Voight | John Voight | Enumeration of totally real number fields of bounded root discriminant | 14 pages, llncs style. To appear in ANTS VIII proceedings | null | null | null | math.NT | null | We enumerate all totally real number fields F with root discriminant delta_F
<= 14. There are 1229 such fields, each with degree [F:QQ] <= 9.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 20:46:06 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Voight",
"John",
""
]
] | [
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] |
802.0195 | Pakuliak Stanislav | S. Pakuliak, V. Rubtsov, A. Silantyev | SOS model partition function and the elliptic weight functions | 21 pages, 5 figures, requires iopart package | null | 10.1088/1751-8113/41/29/295204 | ITEP-TH-50/07 | math.QA | null | We generalize a recent observation [arXiv:math/0610433] that the partition
function of the 6-vertex model with domain-wall boundary conditions can be
obtained by computing the projections of the product of the total currents in
the quantum affine algebra $U_{q}(\hat{\mathfrak{sl}}_{2})$ in its current
realization. A generalization is proved for the the elliptic current algebra
[arXiv:q-alg/9703018,arXiv:q-alg/9601022]. The projections of the product of
total currents are calculated explicitly and are represented as integral
transforms of the product of the total currents. We prove that the kernel of
this transform is proportional to the partition function of the SOS model with
domain-wall boundary conditions.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 20:48:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pakuliak",
"S.",
""
],
[
"Rubtsov",
"V.",
""
],
[
"Silantyev",
"A.",
""
]
] | [
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] |
802.0196 | John Voight | John Voight | Computing fundamental domains for Fuchsian groups | 18 pages, uses pstricks; corrections made as suggested by referree | null | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We exhibit an algorithm to compute a Dirichlet domain for a cofinite Fuchsian
group Gamma. As a consequence, we compute the invariants of Gamma, including an
explicit finite presentation for Gamma.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 20:54:46 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jun 2008 15:22:51 GMT"
},
{
"version": "v3",
"created": "Mon, 11 Aug 2008 17:33:58 GMT"
},
{
"version": "v4",
"created": "Fri, 16 Jan 2009 20:13:58 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Voight",
"John",
""
]
] | [
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802.0197 | Paul Slater | Paul B. Slater | Extended Studies of Separability Functions and Probabilities and the
Relevance of Dyson Indices | 45 pages, 23 figures | J. Geom. Phys. 58 (2008), 1101-1123 | 10.1016/j.geomphys.2008.03.014 | null | quant-ph math-ph math.MP | null | We report substantial progress in the study of separability functions and
their application to the computation of separability probabilities for the
real, complex and quaternionic qubit-qubit and qubit-qutrit systems. We expand
our recent work (arXiv:0704.3723), in which the Dyson indices of random matrix
theory played an essential role, to include the use of not only the volume
element of the Hilbert-Schmidt (HS) metric, but also that of the Bures (minimal
monotone) metric as measures over these finite-dimensional quantum systems.
Further, we now employ the Euler-angle parameterization of density matrices
(rho), in addition to the Bloore parameterization. The Euler-angle separability
function for the minimally degenerate complex two-qubit states is well-fitted
by the sixth-power of the participation ratio, R(rho)=1/Tr(rho)^2.
Additionally, replacing R(rho) by a simple linear transformation of the
Verstraete-Audenaert-De Moor function (arXiv:quant-oh/0011111), we find close
adherence to Dyson-index behavior for the real and complex (nondegenerate)
two-qubit scenarios. Several of the analyses reported help to fortify our
conjectures that the HS and Bures separability probabilities of the complex
two-qubit states are 8/33 = 0.242424 and 1680 (sqrt{2}-1)/pi^8 = 0.733389,
respectively. Employing certain regularized beta functions in the role of
Euler-angle separability functions, we closely reproduce--consistently with the
Dyson-index ansatz--several HS two-qubit separability probability conjectures.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 20:56:14 GMT"
}
] | 2008-09-02T00:00:00 | [
[
"Slater",
"Paul B.",
""
]
] | [
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802.0198 | Eyal Neistein | Eyal Neistein and Avishai Dekel | Merger Rates of Dark-Matter Haloes | 12 pages, 12 figures. Changes from version 1: more figures, moderate
changes in the text, awaiting 2nd referee report | null | 10.1111/j.1365-2966.2008.13525.x | null | astro-ph | null | We derive analytic merger rates for dark-matter haloes within the framework
of the Extended Press-Schechter (EPS) formalism. These rates become
self-consistent within EPS once we realize that the typical merger in the limit
of a small time-step involves more than two progenitors, contrary to the
assumption of binary mergers adopted in earlier studies. We present a general
method for computing merger rates that span the range of solutions permitted by
the EPS conditional mass function, and focus on a specific solution that
attempts to match the merger rates in N-body simulations. The corrected EPS
merger rates are more accurate than the earlier estimates of Lacey & Cole, by
~20% for major mergers and by up to a factor of ~3 for minor mergers of mass
ratio 1:10^4. Based on the revised merger rates, we provide a new algorithm for
constructing Monte-Carlo EPS merger trees, that could be useful in
Semi-Analytic Modeling. We provide analytic expressions and plot numerical
results for several quantities that are very useful in studies of galaxy
formation. This includes (a) the rate of mergers of a given mass ratio per
given final halo, (b) the fraction of mass added by mergers to a halo, and (c)
the rate of mergers per given main progenitor. The creation and destruction
rates of haloes serve for a self-consistency check. Our method for computing
merger rates can be applied to conditional mass functions beyond EPS, such as
those obtained by the ellipsoidal collapse model or extracted from $N$-body
simulations.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 18:15:27 GMT"
},
{
"version": "v2",
"created": "Thu, 22 May 2008 07:23:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Neistein",
"Eyal",
""
],
[
"Dekel",
"Avishai",
""
]
] | [
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] |
802.0199 | Subir Sachdev | Andrea Pelissetto, Subir Sachdev, and Ettore Vicari | Nodal quasiparticles and the onset of spin density wave order in the
cuprates | 4 pages | Physical Review Letters 101, 027005 (2008). | 10.1103/PhysRevLett.101.027005 | null | cond-mat.str-el cond-mat.supr-con | null | We present a theory for the onset of spin density wave order in the
superconducting ground state of the cuprates. We compute the scaling dimensions
of allowed perturbations of a `relativistic' fixed point with O(4)xO(3)
symmetry, including those associated with the fermionic nodal Bogoliubov
quasiparticles. Analyses of up to six loops show that all perturbations with
square lattice symmetry are likely irrelevant. We demonstrate that the fermion
spectral functions are primarily damped by the coupling to fluctuations of a
composite field with Ising nematic order. We also discuss the influence of
quenched disorder.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 10:42:23 GMT"
}
] | 2008-07-11T00:00:00 | [
[
"Pelissetto",
"Andrea",
""
],
[
"Sachdev",
"Subir",
""
],
[
"Vicari",
"Ettore",
""
]
] | [
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] |
802.02 | Branson Stephens | Branson C. Stephens, Yuk Tung Liu, and Stuart L. Shapiro | Collapse of magnetized hypermassive neutron stars in general relativity:
Disk evolution and outflows | null | Phys.Rev.D77:044001,2008 | 10.1103/PhysRevD.77.044001 | null | astro-ph gr-qc | null | We study the evolution in axisymmetry of accretion disks formed
self-consistently through collapse of magnetized hypermassive neutron stars to
black holes. Such stars can arise following the merger of binary neutron stars.
They are differentially rotating, dynamically stable, and have rest masses
exceeding the mass limit for uniform rotation. However, hypermassive neutron
stars are secularly unstable to collapse due to MHD-driven angular momentum
transport. The rotating black hole which forms in this process is surrounded by
a hot, massive, magnetized torus and a magnetic field collimated along the spin
axis. This system is a candidate for the central engine of a short-hard
gamma-ray burst (GRB). Our code integrates the coupled Einstein-Maxwell-MHD
equations and is used to follow the collapse of magnetized hypermassive neutron
star models in full general relativity until the spacetime settles down to a
quasi-stationary state. We then employ the Cowling approximation, in which the
spacetime is frozen, to track the subsequent evolution of the disk. This
approximation allows us to greatly extend the disk evolutions and study the
resulting outflows, which may be relevant to the generation of a GRB. We find
that outflows are suppressed when a stiff equation of state is assumed for low
density disk material and are sensitive to the initial magnetic field
configuration.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 21:08:54 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Stephens",
"Branson C.",
""
],
[
"Liu",
"Yuk Tung",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | [
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] |
802.0201 | Ryuichi Kurosawa | Ryuichi Kurosawa, M. M. Romanova and Tim J. Harries | Three-dimensional simulations of rotationally-induced line variability
from a Classical T Tauri star with a misaligned magnetic dipole | 15 pages, 13 figures. Accepted for publication in MNRAS. A version
with full resolution figures can be downloaded from
http://www.physics.unlv.edu/~rk/preprint/inclined_dipole.pdf | null | 10.1111/j.1365-2966.2008.13055.x | null | astro-ph | null | We present three-dimensional (3-D) simulations of rotationally induced line
variability arising from complex circumstellar environment of classical T Tauri
stars (CTTS) using the results of the 3-D magnetohydrodynamic (MHD) simulations
of Romanova et al., who considered accretion onto a CTTS with a misaligned
dipole magnetic axis with respect to the rotational axis. The density, velocity
and temperature structures of the MHD simulations are mapped on to the
radiative transfer grid, and corresponding line source function and the
observed profiles of neutral hydrogen lines (H-beta, Pa-beta and Br-gamma) are
computed using the Sobolev escape probability method. We study the dependency
of line variability on inclination angles (i) and magnetic axis misalignment
angles (Theta). By comparing our models with the Pa-beta profiles of 42 CTTS
observed by Folha & Emerson, we find that models with a smaller misaligngment
angle (Theta<~15 deg.) are more consistent with the observations which show
that majority of Pa-beta are rather symmetric around the line centre. For a
high inclination system with a small dipole misalignment angle (Theta ~ 15
deg.), only one accretion funnel (on the upper hemisphere) is visible to an
observer at any given rotational phase. This can cause an anti-correlation of
the line equivalent width in the blue wing (v<0) and that in the red wing (v>0)
over a half of a rotational period, and a positive correlation over other half.
We find a good overall agreement of the line variability behaviour predicted by
our model and those from observations. (Abridged)
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 21:13:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kurosawa",
"Ryuichi",
""
],
[
"Romanova",
"M. M.",
""
],
[
"Harries",
"Tim J.",
""
]
] | [
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802.0202 | Keshav Dasgupta | Keshav Dasgupta, Paul Franche, Anke Knauf, James Sully | D-terms on the resolved conifold | 55 pages, Latex, no figures; v2: Typos corrected and references
added; v3: a comment and references added, and typos corrected. Final version
to appear in JHEP | JHEP 0904:027,2009 | 10.1088/1126-6708/2009/04/027 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a novel deformation of the warped resolved conifold background with
supersymmetry breaking ISD (1,2) fluxes by adding D7-branes to this type IIB
theory. We find spontaneous supersymmetry breaking without generating a bulk
cosmological constant. In the compactified form, our background will no longer
be a Calabi-Yau manifold as it allows a non-vanishing first Chern class. In the
presence of D7-branes the (1,2) fluxes can give rise to non-trivial D-terms. We
study the Ouyang embedding of D7-branes in detail and find that in this case
the D-terms are indeed non-zero. In the limit when we approach the singular
conifold, the D-terms vanish for Ouyang's embedding, although supersymmetry
appears to be broken.
We also construct the F-theory lift of our background and demonstrate how
these IIB (1,2) fluxes lift to non-primitive (2,2) flux on the fourfold. The
seven branes correspond to normalisable harmonic forms. We briefly sketch a
possible way to attain an inflaton potential in this background once extra
D3-branes are introduced and point out some possibilities of restoring
supersymmetry in our background that could in principle be used as the end
point of the inflationary set-up. In a companion paper we will analyse in
details the inflationary dynamics in this background.
| [
{
"version": "v1",
"created": "Fri, 1 Feb 2008 21:19:47 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 16:15:49 GMT"
},
{
"version": "v3",
"created": "Fri, 13 Mar 2009 15:53:30 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Dasgupta",
"Keshav",
""
],
[
"Franche",
"Paul",
""
],
[
"Knauf",
"Anke",
""
],
[
"Sully",
"James",
""
]
] | [
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