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801.3773 | Lars Eirik Danielsen | Lars Eirik Danielsen | Graph-Based Classification of Self-Dual Additive Codes over Finite
Fields | 20 pages, 13 figures | Adv. Math. Commun. 3(4), pp. 329-348, 2009 | 10.3934/amc.2009.3.329 | null | cs.IT math.CO math.IT quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum stabilizer states over GF(m) can be represented as self-dual additive
codes over GF(m^2). These codes can be represented as weighted graphs, and
orbits of graphs under the generalized local complementation operation
correspond to equivalence classes of codes. We have previously used this fact
to classify self-dual additive codes over GF(4). In this paper we classify
self-dual additive codes over GF(9), GF(16), and GF(25). Assuming that the
classical MDS conjecture holds, we are able to classify all self-dual additive
MDS codes over GF(9) by using an extension technique. We prove that the minimum
distance of a self-dual additive code is related to the minimum vertex degree
in the associated graph orbit. Circulant graph codes are introduced, and a
computer search reveals that this set contains many strong codes. We show that
some of these codes have highly regular graph representations.
| [
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801.3774 | Remi Carles | R\'emi Carles (I3M), Isabelle Gallagher (IMJ) | Analyticity of the scattering operator for semilinear dispersive
equations | 29 pages | Communications in Mathematical Physics 286, 3 (2009) 1181-1209 | 10.1007/s00220-008-0599-x | null | math.AP math-ph math.MP | null | We present a general algorithm to show that a scattering operator associated
to a semilinear dispersive equation is real analytic, and to compute the
coefficients of its Taylor series at any point. We illustrate this method in
the case of the Schrodinger equation with power-like nonlinearity or with
Hartree type nonlinearity, and in the case of the wave and Klein-Gordon
equations with power nonlinearity. Finally, we discuss the link of this
approach with inverse scattering, and with complete integrability.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 14:50:01 GMT"
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] | 2009-02-13T00:00:00 | [
[
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"Rémi",
"",
"I3M"
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"Isabelle",
"",
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801.3775 | Jean-Jacques Sinou | Nicolas Lesaffre (LTDS), Jean-Jacques Sinou (LTDS), Fabrice Thouverez
(LTDS) | Stability analysis of rotating beams rubbing on an elastic circular
structure | null | Journal of Sound and Vibration 299, 4-5 (2007) 1005-1032 | 10.1016/j.jsv.2006.08.027 | null | physics.class-ph math.DS | null | This paper presents the stability analysis of a system composed of rotating
beams on a flexible, circular fixed ring, using the Routh-Hurwitz criterion.
The model displayed has been fully developed within the rotating frame by use
of an energy approach. The beams considered possess two degrees of freedom
(dofs), a flexural motion as well as a traction/compression motion. In-plane
deformations of the ring will be considered. Divergences and mode couplings
have thus been underscored within the rotating frame and in order to simplify
understanding of all these phenomena, the dofs of the beams will first be
treated separately and then together. The dynamics of radial rotating loads on
an elastic ring can create divergence instabilities as well as post-critical
mode couplings. Moreover, the flexural motion of beam rubbing on the ring can
also lead to mode couplings and to the locus-veering phenomenon. The presence
of rubbing seems to make the system unstable as soon as the rotational speed of
the beams is greater than zero. Lastly, the influence of an angle between the
beams and the normal to the ring's inner surface will be studied with respect
to system stability, thus highlighting a shift frequency phenomenon.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 14:51:48 GMT"
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] | 2012-09-28T00:00:00 | [
[
"Lesaffre",
"Nicolas",
"",
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[
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"",
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[
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801.3776 | Thomas Schucker | Thomas Schucker, Noureddine Zaimen | Cosmological constant and time delay | 8 pages, 1 figure | null | 10.1051/0004-6361:200809449 | CPT-P001-2008 | astro-ph gr-qc | null | The effect of the cosmological constant on the time delay caused by an
isolated spherical mass is calculated without using the lens equation and
compared to a recent observational bound on the time delay of the lensed quasar
SDSS J1004+4112.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 14:57:15 GMT"
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] | 2009-11-13T00:00:00 | [
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"Thomas",
""
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801.3777 | Robert Fleischer | Robert Fleischer (CERN) | Prospects for B-Decay Studies at the LHC | 18 pages, 4 figures, invited talk at the 3rd High-Energy Physics
Conference in Madagascar (HEP-MAD 07), 10-15 September 2007, Antananarivo,
Madagascar, to appear in the proceedings | null | null | CERN-PH-TH/2008-016 | hep-ph | null | In this decade, there are huge efforts to explore B-meson decays, which offer
interesting probes to test the quark-flavour structure of the Standard Model
and to search for signals of new physics. Exciting new perspectives for these
studies will soon arise at the LHC, where decays of $B^0_s$ mesons will be a
key target of the B-physics programme. We will discuss theoretical aspects of
various benchmark channels and address the question of how much space for
new-physics effects in their observables is left by the recent experimental
results from the B factories and the Tevatron.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:04:45 GMT"
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] | 2008-01-25T00:00:00 | [
[
"Fleischer",
"Robert",
"",
"CERN"
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801.3778 | Jes\'us Ma\'iz Apell\'aniz | J. Ma\'iz Apell\'aniz | IMF biases created by binning and unresolved systems | 6 pages, 10 figures, to appear in "Young massive clusters, initial
conditions and environments", typo in author's name corrected | null | 10.1007/s10509-009-0117-4 | null | astro-ph | null | I discuss two of the possible sources of biases in the determination of the
IMF: binning and the existence of unresolved components. The first source is
important for clusters with a small number of stars detected in a given mass
bin while the second one is relevant for all clusters located beyond the
immediate solar neighborhood. For both cases I will present results of
numerical simulations and I will discuss strategies to correct for their
effects. I also present a brief description of a third unrelated bias source.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:06:45 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2008 07:27:05 GMT"
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[
"Apellániz",
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] |
801.3779 | A. S. Alexandrov | A. S. Alexandrov | Bipolaronic proximity and other unconventional effects in cuprate
superconductors | 16 pages, 5 figures, invited contribution to "Electron Transport in
Nanosystems", eds. Janez Bonca and Sergei Kruchinin (Springer 2008), more
references and a comment on the recent reinterpretation of the isotope
effects are added | ELECTRON TRANSPORT IN NANOSYSTEMS Book Series: NATO Science for
Peace and Security Series B - Physics and Biophysics Pages: 139-153
Published: 2008 | 10.1007/978-1-4020-9146-9_12 | null | cond-mat.supr-con cond-mat.str-el | null | There is compelling evidence for a strong electron-phonon interaction (EPI)
in cuprate superconductors from the isotope effects on the supercarrier mass,
high resolution angle resolved photoemission spectroscopies (ARPES), a number
of optical and neutron-scattering measurements in accordance with our
prediction of high-temperature superconductivity in polaronic liquids. A number
of observations point to the possibility that high-Tc cuprate superconductors
may not be conventional Bardeen-Cooper-Schrieffer (BCS) superconductors, but
rather derive from the Bose-Einstein condensation (BEC) of real-space pairs,
which are mobile small bipolarons. Here I review the bipolaron theory of
unconventional proximity effects, the symmetry and checkerboard modulations of
the order parameter and quantum magneto-oscillations discovered recently in
cuprates.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:08:41 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 16:32:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alexandrov",
"A. S.",
""
]
] | [
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] |
801.378 | Hubert Hennion | Hubert Hennion (Universit\'e de Rennes I), Loic Herv\'e (Institut
National des Sciences Appliqu\'ees de Rennes) | Stable laws and products of positive random matrices | 14 pages. To appear in Journal of Theoretical Probability | null | null | null | math.PR math.FA | null | Let $S$ be the multiplicative semigroup of $q\times q$ matrices with positive
entries such that every row and every column contains a strictly positive
element. Denote by $(X_n)_{n\geq1}$ a sequence of independent identically
distributed random variables in $S$ and by $X^{(n)} = X_n ... X_1$, $ n\geq 1$,
the associated left random walk on $S$. We assume that $(X_n)_{n\geq1}$
verifies the contraction property
$\P(\bigcup_{n\geq1}[X^{(n)} \in S^\circ])>0$,
where $S^\circ $ is the subset of all matrices which have strictly positive
entries. We state conditions on the distribution of the random matrix $X_1$
which ensure that the logarithms of the entries, of the norm, and of the
spectral radius of the products $X^{(n)}$, $n\ge 1$, are in the domain of
attraction of a stable law.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:16:08 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Hennion",
"Hubert",
"",
"Université de Rennes I"
],
[
"Hervé",
"Loic",
"",
"Institut\n National des Sciences Appliquées de Rennes"
]
] | [
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] |
801.3781 | Tae Hoon Lee | S. T. Hong, J. Lee, T. H. Lee, and P. OH | Higher dimensional cosmological model with a phantom field | 4 pages, 2 figures; References added | Phys.Rev.D78:047503,2008 | 10.1103/PhysRevD.78.047503 | null | gr-qc | null | We consider a higher dimensional gravity theory with a negative kinetic
energy scalar field and a cosmological constant. We find that the theory admits
an exact cosmological solution for the scale factor of our universe. It has the
feature that the universe undergoes a continuous transition from deceleration
to acceleration at some finite time. This transition time can be interpreted as
that of recent acceleration of our universe.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:21:25 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 04:53:48 GMT"
},
{
"version": "v3",
"created": "Wed, 21 May 2008 05:29:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hong",
"S. T.",
""
],
[
"Lee",
"J.",
""
],
[
"Lee",
"T. H.",
""
],
[
"OH",
"P.",
""
]
] | [
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] |
801.3782 | Georgios Magdis E | G.E. Magdis, D. Rigopoulou, J.-S. Huang, G.G. Fazio, S.P. Willner,
M.L.N. Ashby | IRAC Photometric Analysis and the Mid-IR Photometric Properties of Lyman
Break Galaxies | Accepted for publication at MNRAS | null | 10.1111/j.1365-2966.2008.13020.x | null | astro-ph | null | We present photometric analysis of deep mid-infrared observations obtained by
Spitzer/IRAC covering the fields Q1422+2309, Q2233+1341, DSF2237a,b, HDFN,
SSA22a,b and B20902+34, giving the number counts and the depths for each field.
In a sample of 751 LBGs lying in those fields, 443, 448, 137 and 152 are
identified at 3.6microns, 4.5microns, 5.8microns, 8.0microns IRAC bands
respectively, expanding their spectral energy distribution to
rest-near-infrared and revealing that LBGs display a variety of colours. Their
rest-near-infrared properties are rather inhomogeneous, ranging from those that
are bright in IRAC bands and exhibit [R]-[3.6] > 1.5 colours to those that are
faint or not detected at all in IRAC bands with [R]-[3.6] < 1.5 colours and
these two groups of LBGs are investigated. We compare the mid-IR colours of the
LBGs with the colours of star-forming galaxies and we find that LBGs have
colours consistent with star-foming galaxies at z~3. The properties of the LBGs
detected in the 8microns IRAC band (rest frame K-band) are examined separately,
showing that they exhibit redder [R]-[3.6] colours than the rest of the
population and that IRAC 8microns band can be used as a diagnostic tool, to
separate AGN dominated objects from normal star-forming galaxies at z~3
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:23:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Magdis",
"G. E.",
""
],
[
"Rigopoulou",
"D.",
""
],
[
"Huang",
"J. -S.",
""
],
[
"Fazio",
"G. G.",
""
],
[
"Willner",
"S. P.",
""
],
[
"Ashby",
"M. L. N.",
""
]
] | [
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] |
801.3783 | Michael Galperin | Michael Galperin, Abraham Nitzan, and Mark A. Ratner | Non-linear response of molecular junctions: The polaron model revisited | 10 pages, 1 figure | J. Phys.: Condens. Matter 20, 374107 (2008) | 10.1088/0953-8984/20/37/374107 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | A polaron model proposed as a possible mechanism for nonlinear conductance
[Galperin M, Ratner M A, and Nitzan A 2005 Nano Lett. 5 125-30] is revisited
with focus on the differences between the weak and strong molecule-lead
coupling cases. Within the one-molecular level model we present an approximate
expression for the electronic Green function corresponding to inelastic
transport case, which in the appropriate limits reduces to expressions
presented previously for the isolated molecule and for molecular junction
coupled to a slow vibration (static limit). The relevance of considerations
based on the isolated molecule limit to understanding properties of molecular
junctions is discussed.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:26:34 GMT"
}
] | 2008-08-26T00:00:00 | [
[
"Galperin",
"Michael",
""
],
[
"Nitzan",
"Abraham",
""
],
[
"Ratner",
"Mark A.",
""
]
] | [
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] |
801.3784 | Christoph Fretter | C. Fretter and B. Drossel | Response of Boolean networks to perturbations | null | The European Physical Journal B Volume 62, Number 3 (2008) | 10.1140/epjb/e2008-00159-0 | null | cond-mat.stat-mech | null | We evaluate the probability that a Boolean network returns to an attractor
after perturbing h nodes. We find that the return probability as function of h
can display a variety of different behaviours, which yields insights into the
state-space structure. In addition to performing computer simulations, we
derive analytical results for several types of Boolean networks, in particular
for Random Boolean Networks. We also apply our method to networks that have
been evolved for robustness to small perturbations, and to a biological
example.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:45:45 GMT"
}
] | 2010-07-02T00:00:00 | [
[
"Fretter",
"C.",
""
],
[
"Drossel",
"B.",
""
]
] | [
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] |
801.3785 | M. Ebrahim Fouladvand | M. Ebrahim Foulaadvand and Mehdi Neek-Amal | Asymmetric simple exclusion process describing conflicting traffic flows | 7 pages, 10 eps figures, Revtex | Euro. Phys. Letters: 80, No 6, 60002 (2007) | 10.1209/0295-5075/80/60002 | null | physics.soc-ph | null | We use the asymmetric simple exclusion process for describing vehicular
traffic flow at the intersection of two streets. No traffic lights control the
traffic flow. The approaching cars to the intersection point yield to each
other to avoid collision. This yielding dynamics is model by implementing
exclusion process to the intersection point of the two streets. Closed boundary
condition is applied to the streets. We utilize both mean-field approach and
extensive simulations to find the model characteristics. In particular, we
obtain the fundamental diagrams and show that the effect of interaction between
chains can be regarded as a dynamic impurity at the intersection point.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:47:45 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Foulaadvand",
"M. Ebrahim",
""
],
[
"Neek-Amal",
"Mehdi",
""
]
] | [
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] |
801.3786 | Huirong Yan | Huirong Yan, A. Lazarian and V. Petrosian | Particle Acceleration by Fast Modes in Solar Flares | 7 pages, 4 figures, accepted to ApJ | null | 10.1086/589962 | null | astro-ph | null | We address the problem of particle acceleration in solar flares by fast modes
which may be excited during the reconnection and undergo cascade and are
subjected to damping. We extend the calculations beyond quasilinear
approximation and compare the acceleration and scattering by transit time
damping and gyroresonance interactions. We find that the acceleration is
dominated by the so called transit time damping mechanism. We estimate the
total energy transferred into particles, and show that our approach provides
sufficiently accurate results We compare this rate with energy loss rate.
Scattering by fast modes appears to be sufficient to prevent the protons from
escaping the system during the acceleration. Confinement of electrons, on the
other hand, requires the existence of plasma waves. Electrons can be
accelerated to GeV energies through the process described here for solar flare
conditions.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:02:38 GMT"
},
{
"version": "v2",
"created": "Thu, 8 May 2008 06:19:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yan",
"Huirong",
""
],
[
"Lazarian",
"A.",
""
],
[
"Petrosian",
"V.",
""
]
] | [
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] |
801.3787 | Sangeeta Sharma | S. Sharma, J. K. Dewhurst, N. N. Lathiotakis, E. K. U. Gross | Reduced Density Matrix Functional for Many-Electron Systems | 4 figs and 1 table | null | 10.1103/PhysRevB.78.201103 | null | cond-mat.mtrl-sci cond-mat.str-el | null | Reduced density matrix functional theory for the case of solids is presented
and a new exchange correlation functional based on a fractional power of the
density matrix is introduced. We show that compared to other functionals, this
produces more accurate results for both finite systems. Moreover, it captures
the correct band gap behavior for conventional semiconductors as well as
strongly correlated Mott insulators, where a gap is obtained in absence of any
magnetic ordering.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 15:59:38 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jun 2008 12:57:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sharma",
"S.",
""
],
[
"Dewhurst",
"J. K.",
""
],
[
"Lathiotakis",
"N. N.",
""
],
[
"Gross",
"E. K. U.",
""
]
] | [
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] |
801.3788 | Susan Margulies | J.A. De Loera, J. Lee, P. Malkin, S. Margulies | Hilbert's Nullstellensatz and an Algorithm for Proving Combinatorial
Infeasibility | null | null | null | null | math.CO math.OC | null | Systems of polynomial equations over an algebraically-closed field K can be
used to concisely model many combinatorial problems. In this way, a
combinatorial problem is feasible (e.g., a graph is 3-colorable, hamiltonian,
etc.) if and only if a related system of polynomial equations has a solution
over K. In this paper, we investigate an algorithm aimed at proving
combinatorial infeasibility based on the observed low degree of Hilbert's
Nullstellensatz certificates for polynomial systems arising in combinatorics
and on large-scale linear-algebra computations over K. We report on experiments
based on the problem of proving the non-3-colorability of graphs. We
successfully solved graph problem instances having thousands of nodes and tens
of thousands of edges.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:02:22 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"De Loera",
"J. A.",
""
],
[
"Lee",
"J.",
""
],
[
"Malkin",
"P.",
""
],
[
"Margulies",
"S.",
""
]
] | [
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] |
801.3789 | Stefano Lepri | G. Basile, L. Delfini, S. Lepri, R. Livi, S. Olla, A. Politi | Anomalous transport and relaxation in classical one-dimensional models | null | Eur. Phys. J. Special Topics. vol. 151 pag. 85-93 (2007) | null | null | cond-mat.stat-mech | null | After reviewing the main features of anomalous energy transport in 1D
systems, we report simulations performed with chains of noisy anharmonic
oscillators. The stochastic terms are added in such a way to conserve total
energy and momentum, thus keeping the basic hydrodynamic features of these
models. The addition of this "conservative noise" allows to obtain a more
efficient estimate of the power-law divergence of heat conductivity kappa(L) ~
L^alpha in the limit of small noise and large system size L. By comparing the
numerical results with rigorous predictions obtained for the harmonic chain, we
show how finite--size and --time effects can be effectively controlled. For low
noise amplitudes, the alpha values are close to 1/3 for asymmetric potentials
and to 0.4 for symmetric ones. These results support the previously conjectured
two-universality-classes scenario.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:14:02 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Basile",
"G.",
""
],
[
"Delfini",
"L.",
""
],
[
"Lepri",
"S.",
""
],
[
"Livi",
"R.",
""
],
[
"Olla",
"S.",
""
],
[
"Politi",
"A.",
""
]
] | [
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0.002867264
] |
801.379 | Khaled Elbassioni | Endre Boros, Khaled Elbassioni, Vladimir Gurvich, Hans Raj Tiwary | Characterization of the Vertices and Extreme Directions of the Negative
Cycles Polyhedron and Hardness of Generating Vertices of 0/1-Polyhedra | Title typo fixed | null | null | null | cs.CC cs.DM | null | Given a graph $G=(V,E)$ and a weight function on the edges $w:E\mapsto\RR$,
we consider the polyhedron $P(G,w)$ of negative-weight flows on $G$, and get a
complete characterization of the vertices and extreme directions of $P(G,w)$.
As a corollary, we show that, unless $P=NP$, there is no output polynomial-time
algorithm to generate all the vertices of a 0/1-polyhedron. This strengthens
the NP-hardness result of Khachiyan et al. (2006) for non 0/1-polyhedra, and
comes in contrast with the polynomiality of vertex enumeration for
0/1-polytopes \cite{BL98} [Bussieck and L\"ubbecke (1998)].
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:16:45 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Apr 2008 17:26:09 GMT"
}
] | 2008-04-28T00:00:00 | [
[
"Boros",
"Endre",
""
],
[
"Elbassioni",
"Khaled",
""
],
[
"Gurvich",
"Vladimir",
""
],
[
"Tiwary",
"Hans Raj",
""
]
] | [
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] |
801.3791 | J. Schaffner-Bielich | Jurgen Schaffner-Bielich | Hypernuclear Physics for Neutron Stars | 19 pages, 2 figures, updated and extended version of
astro-ph/0703113, accepted for publication in a special issue of Nuclear
Physics A `Recent Advances in Strangeness Nuclear Physics' | Nucl.Phys.A804:309-321,2008 | 10.1016/j.nuclphysa.2008.01.005 | null | astro-ph | null | The role of hypernuclear physics for the physics of neutron stars is
delineated. Hypernuclear potentials in dense matter control the hyperon
composition of dense neutron star matter. The three-body interactions of
nucleons and hyperons determine the stiffness of the neutron star equation of
state and thereby the maximum neutron star mass. Two-body hyperon-nucleon and
hyperon-hyperon interactions give rise to hyperon pairing which exponentially
suppresses cooling of neutron stars via the direct hyperon URCA processes.
Non-mesonic weak reactions with hyperons in dense neutron star matter govern
the gravitational wave emissions due to the r-mode instability of rotating
neutron stars.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:17:09 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Schaffner-Bielich",
"Jurgen",
""
]
] | [
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] |
801.3792 | David Grynkiewicz | Weidong Gao, Alfred Geroldinger, David J. Grynkiewicz | Inverse Zero-Sum Problems III | null | null | null | null | math.NT math.CO | null | Let $G$ be a finite abeilian group. A sequence $S$ with terms from $G$ is
zero-sum if the sum of terms in $S$ equals zero. It is a minimal zero-sum
sequence if no proper, nontrivial subsequence is zero-sum. The maximal length
of a minimal zero-sum subsequence in $G$ is the Davenport constant, denoted
$D(G)$. For a rank 2 group $G=C_n \oplus C_n$, it is known that $D(G)=2n-1$.
However, the structure of all maximal length minimal zero-sum sequences remains
open. If every such sequence contains a term with multiplicity $n-1$, then $C_n
\oplus C_n$ is said to have Property B, and it is conjectured that this is true
for all rank 2 groups $C_n \oplus C_n$.
In this paper, we show that Property B is multiplicative, namely, if $G=C_n
\oplus C_n$ and $G=C_m \oplus C_m$ both satisfy Property B, with $m, n\geq 3$
odd and $mn>9$, then $C_{mn}\oplus C_{mn}$ satisfies Property B also. Combined
with previous work in the literature, this reduces the question of establishing
Property B to the prime cases, and in such case the complete structural
description of the sequence follows.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:24:31 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Gao",
"Weidong",
""
],
[
"Geroldinger",
"Alfred",
""
],
[
"Grynkiewicz",
"David J.",
""
]
] | [
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] |
801.3793 | Pedro Sancho | Pedro Sancho | Second order contributions to the absorption of massive particles | Corrected typos. Annals of Physics, in press | null | 10.1016/j.aop.2007.09.007 | null | quant-ph | null | Recently, in analogy with multiphoton ionization, it has been suggested that
multiparticle ionization can also be induced by massive systems. We explore in
this paper the possibility that multiparticle absorption processes can also
take place for massive particles. To study it we consider, in a perturbative
way, a model of absorption which illustrates the analogies with Glauber's
scheme for photons and previous analysis on matter-waves coherence. A major
advantage of this approach is that the dependence of the absorption rates on
the wavefunction of the incident system can be analyzed in an explicit way. The
calculations confirm the form of the second order (two-particle) contributions.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:47:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sancho",
"Pedro",
""
]
] | [
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] |
801.3794 | Gerard Czajkowski | Vladimir M. Agranovich and Gerard Czajkowski | Resonant Energy Transfer from Organics to Quantum Dots and Carrier
Multiplication | 4 pages, 1 Postscript figures, submitted to | null | null | null | cond-mat.mtrl-sci cond-mat.other | null | It was shown in the recent experiments that the hybrid organic/inorganic
resonant structures can provide a flexible materials platform aimed at the
design of novel light emitting devices. The applications of hybrid structures
for photovoltaic solar cell can also be useful. We pay attention in this note
that the resonant energy transfer in hybrid structure from the organic thin
layer to the semiconductor nanostructures can drastically increase the
intensity of the free carrier generation. To demonstrate this idea we use the
results of recently published paper by Zhang et al., Nature Nanotechnology 2,
555 (2007), demonstrating the highly efficient resonance energy transfer from
J-aggregates layer to semiconductor nanocrystals. It is known that the
semiconductor nanocrystals with small energy gap represent a promising route to
increased solar conversion in single--junction photovoltaic cells. We argue
that the using of nanocrystals with small energy gap in the hybrid
organic/inorganic structures similar to created by Zhang et al. can increase
tens times the total intensity of carrier multiplication. The organic part in
such hybrid structures will play a role of the peculiar organic concentrator of
the light energy.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:36:08 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Agranovich",
"Vladimir M.",
""
],
[
"Czajkowski",
"Gerard",
""
]
] | [
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801.3795 | Menderes Iskin | M. Iskin and C. J. Williams | Trapped p-wave superfluids: a local density approach | 4 pages and 4 figures, to be submitted to PRA | Phys. Rev. A 77, 041607(R) (2008). | 10.1103/PhysRevA.77.041607 | null | cond-mat.supr-con cond-mat.other | null | The local density approximation is used to study the ground state superfluid
properties of harmonically trapped p-wave Fermi gases as a function of
fermion-fermion attraction strength. While the density distribution is bimodal
on the weakly attracting BCS side, it becomes unimodal with increasing
attraction and saturates towards the BEC side. This non-monotonic evolution is
related to the topological gapless to gapped phase transition, and may be
observed via radio-frequency spectroscopy since quasi-particle transfer current
requires a finite threshold only on the BEC side.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:36:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iskin",
"M.",
""
],
[
"Williams",
"C. J.",
""
]
] | [
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] |
801.3796 | Amit Rai | Amit Rai and G. S. Agarwal | A Quantum Optical Spring | 5 figures | PHYSICAL REVIEW A 78, 013831 (2008) | 10.1103/PhysRevA.78.013831 | null | quant-ph | null | We study the dynamics of the quantum optical spring, i.e., a spring whose
spring constant undergoes discreet jumps depending on the quantum state of
another system. We show the existence of revivals and fractional revivals in
the quantum dynamics reminiscent of similar dynamical features in cavity QED.
We recover in the semi classical limit the results for an oscillator whose
frequency undergoes a sudden change. The quantum optical spring is conceivable
for example by a micromirror under the influence of radiation pressure by a
field which is strictly quantum. Our work suggests that driven systems would in
general exhibit a very different dynamics if the drive is replaced by a quantum
source.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:40:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rai",
"Amit",
""
],
[
"Agarwal",
"G. S.",
""
]
] | [
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] |
801.3797 | Joris Mooij | Joris M. Mooij, Hilbert J. Kappen | Novel Bounds on Marginal Probabilities | 33 pages. Submitted to Journal of Machine Learning Research | null | null | null | math.PR | null | We derive two related novel bounds on single-variable marginal probability
distributions in factor graphs with discrete variables. The first method
propagates bounds over a subtree of the factor graph rooted in the variable,
and the second method propagates bounds over the self-avoiding walk tree
starting at the variable. By construction, both methods not only bound the
exact marginal probability distribution of a variable, but also its approximate
Belief Propagation marginal (``belief''). Thus, apart from providing a
practical means to calculate bounds on marginals, our contribution also lies in
an increased understanding of the error made by Belief Propagation.
Empirically, we show that our bounds often outperform existing bounds in terms
of accuracy and/or computation time. We also show that our bounds can yield
nontrivial results for medical diagnosis inference problems.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:43:39 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Mooij",
"Joris M.",
""
],
[
"Kappen",
"Hilbert J.",
""
]
] | [
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] |
801.3798 | Carsten Brandau | C. Brandau, C. Kozhuharov, Z. Harman, A. M\"uller, S. Schippers, Y.S.
Kozhedub, D. Bernhardt, S. B\"ohm, J. Jacobi, E.W. Schmidt, P.H. Mokler, F.
Bosch, H.-J. Kluge, Th. St\"ohlker, K. Beckert, P. Beller, F. Nolden, M.
Steck, A. Gumberidze, R. Reuschl, U. Spillmann, F.J. Currell, I.I. Tupitsyn,
V.M. Shabaev, U.D. Jentschura, C.H. Keitel, A. Wolf, Z. Stachura | Isotope shift in the dielectronic recombination of three-electron
^{A}Nd^{57+} | 10 pages, 3 figures, accepted for publication in Physical Review
Letters | Phys. Rev. Lett. 100, 073201 (2008) | 10.1103/PhysRevLett.100.073201 | null | physics.atom-ph | null | Isotope shifts in dielectronic recombination spectra were studied for Li-like
^{A}Nd^{57+} ions with A=142 and A=150. From the displacement of resonance
positions energy shifts \delta E^{142,150}(2s-2p_1/2)= 40.2(3)(6) meV
(stat)(sys)) and \delta E^{142,150}(2s-2p_3/2) = 42.3(12)(20) meV of 2s-2p_j
transitions were deduced. An evaluation of these values within a full QED
treatment yields a change in the mean-square charge radius of ^{142,150}\delta
<r^2> = -1.36(1)(3) fm^2. The approach is conceptually new and combines the
advantage of a simple atomic structure with high sensitivity to nuclear size.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:14:38 GMT"
}
] | 2008-04-05T00:00:00 | [
[
"Brandau",
"C.",
""
],
[
"Kozhuharov",
"C.",
""
],
[
"Harman",
"Z.",
""
],
[
"Müller",
"A.",
""
],
[
"Schippers",
"S.",
""
],
[
"Kozhedub",
"Y. S.",
""
],
[
"Bernhardt",
"D.",
""
],
[
"Böhm",
"S.",
""
],
[
"Jacobi",
"J.",
""
],
[
"Schmidt",
"E. W.",
""
],
[
"Mokler",
"P. H.",
""
],
[
"Bosch",
"F.",
""
],
[
"Kluge",
"H. -J.",
""
],
[
"Stöhlker",
"Th.",
""
],
[
"Beckert",
"K.",
""
],
[
"Beller",
"P.",
""
],
[
"Nolden",
"F.",
""
],
[
"Steck",
"M.",
""
],
[
"Gumberidze",
"A.",
""
],
[
"Reuschl",
"R.",
""
],
[
"Spillmann",
"U.",
""
],
[
"Currell",
"F. J.",
""
],
[
"Tupitsyn",
"I. I.",
""
],
[
"Shabaev",
"V. M.",
""
],
[
"Jentschura",
"U. D.",
""
],
[
"Keitel",
"C. H.",
""
],
[
"Wolf",
"A.",
""
],
[
"Stachura",
"Z.",
""
]
] | [
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] |
801.3799 | Howard Baer | Howard Baer, Harrison Prosper and Heaya Summy | Early SUSY discovery at LHC without missing E_T: the role of
multi-leptons | 13 pages including 9 eps figures. Version 2 has just one added
citation | Phys.Rev.D77:055017,2008 | 10.1103/PhysRevD.77.055017 | FSU-HEP-080116 | hep-ph hep-ex | null | Traditional searches for SUSY at hadron colliders rely heavily on the
presence of large missing transverse energy (ME_T) to reject background
compared to signal. On the other hand, initial searches for new physics at the
LHC may not be able to rely on ME_T due to a variety of detector calibration
issues. We show that much of SUSY parameter space is accessible to discovery
even {\it without} using ME_T, and with rather low integrated luminosities
0.1-1 fb^{-1}. A key role is played by isolated lepton multiplicity which
arises from gluino and squark cascade decays. Requiring \ge 3 isolated leptons
plus jets yields a high rate of background rejection compared to signal. We
find an LHC reach in m(gluino) of about 700-750 GeV for just 0.1 fb^{-1} of
integrated luminosity by requiring events with \ge 4 jets plus \ge 3 isolated
leptons but {\it without} using ME_T. If a large enough event sample is
assembled, then kinematic reconstruction of sparticle mass properties should be
possible just as in the case where large ME_T is required. SUSY without ME_T
can also be seen in opposite-sign/same flavor {\it dilepton plus jets} events
when a characteristic invariant mass edge stands out against background.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 16:57:02 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 18:45:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Baer",
"Howard",
""
],
[
"Prosper",
"Harrison",
""
],
[
"Summy",
"Heaya",
""
]
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801.38 | Jacob Biamonte | J.D. Biamonte | Non-perturbative k-body to two-body commuting conversion Hamiltonians
and embedding problem instances into Ising spins | Published version | Phys. Rev. A 77, 052331 (2008). | 10.1103/PhysRevA.77.052331 | null | quant-ph | null | An algebraic method has been developed which allows one to engineer several
energy levels including the low-energy subspace of interacting spin systems. By
introducing ancillary qubits, this approach allows k-body interactions to be
captured exactly using 2-body Hamiltonians. Our method works when all terms in
the Hamiltonian share the same basis and has no dependence on perturbation
theory or the associated large spectral gap. Our methods allow problem instance
solutions to be embedded into the ground energy state of Ising spin systems.
Adiabatic evolution might then be used to place a computational system into
it's ground state.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:07:19 GMT"
},
{
"version": "v2",
"created": "Sun, 13 Apr 2008 15:54:13 GMT"
},
{
"version": "v3",
"created": "Thu, 29 May 2008 18:24:08 GMT"
}
] | 2008-07-29T00:00:00 | [
[
"Biamonte",
"J. D.",
""
]
] | [
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801.3801 | Virginia Re | AURIGA Collaboration, Virgo Collaboration | A Cross-correlation method to search for gravitational wave bursts with
AURIGA and Virgo | 11 pages, 6 figures, submitted to CQG special issue for Amaldi 7
Proceedings | Class.Quant.Grav.25:114046,2008 | 10.1088/0264-9381/25/11/114046 | null | gr-qc | null | We present a method to search for transient GWs using a network of detectors
with different spectral and directional sensitivities: the interferometer Virgo
and the bar detector AURIGA. The data analysis method is based on the
measurements of the correlated energy in the network by means of a weighted
cross-correlation. To limit the computational load, this coherent analysis step
is performed around time-frequency coincident triggers selected by an excess
power event trigger generator tuned at low thresholds. The final selection of
GW candidates is performed by a combined cut on the correlated energy and on
the significance as measured by the event trigger generator. The method has
been tested on one day of data of AURIGA and Virgo during September 2005. The
outcomes are compared to the results of a stand-alone time-frequency
coincidence search. We discuss the advantages and the limits of this approach,
in view of a possible future joint search between AURIGA and one
interferometric detector.
| [
{
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"created": "Thu, 24 Jan 2008 17:03:21 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"AURIGA Collaboration",
"",
""
],
[
"Virgo Collaboration",
"",
""
]
] | [
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801.3802 | Sven Kosub | Sven Kosub | Dichotomy Results for Fixed-Point Existence Problems for Boolean
Dynamical Systems | 17 pages; this version corrects an error/typo in the 2008/01/24
version | Mathematics in Computer Science, 1(3):487-505, 2008, special issue
on Modeling and Analysis of Complex Systems | null | TUM-I0701, Institut fuer Informatik, Technische Universitaet
Muenchen | cs.CC cond-mat.dis-nn cs.DM nlin.AO nlin.CG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A complete classification of the computational complexity of the fixed-point
existence problem for boolean dynamical systems, i.e., finite discrete
dynamical systems over the domain {0, 1}, is presented. For function classes F
and graph classes G, an (F, G)-system is a boolean dynamical system such that
all local transition functions lie in F and the underlying graph lies in G. Let
F be a class of boolean functions which is closed under composition and let G
be a class of graphs which is closed under taking minors. The following
dichotomy theorems are shown: (1) If F contains the self-dual functions and G
contains the planar graphs then the fixed-point existence problem for (F,
G)-systems with local transition function given by truth-tables is NP-complete;
otherwise, it is decidable in polynomial time. (2) If F contains the self-dual
functions and G contains the graphs having vertex covers of size one then the
fixed-point existence problem for (F, G)-systems with local transition function
given by formulas or circuits is NP-complete; otherwise, it is decidable in
polynomial time.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:10:12 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Dec 2008 16:53:14 GMT"
}
] | 2008-12-01T00:00:00 | [
[
"Kosub",
"Sven",
""
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801.3803 | Juan Antonio Zurita Heras | J.A. Zurita Heras and S. Chaty (AIM/CEA Saclay) | INTEGRAL, XMM-Newton and ESO/NTT identification of AX J1749.1-2733: an
obscured and probably distant Be/X-ray binary | accepted A&A, 11 pages, 9 figures | null | 10.1051/0004-6361:20079097 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | AX J1749.1-2733 is an unclassified transient X-ray source discovered during
surveys by ASCA in 1993-1999. A multi-wavelength study in NIR, optical, X-rays
and hard X-rays is undertaken in order to determine its nature. AX J1749.1-2733
is a new high-mass X-ray binary pulsar with an orbital period of 185.5+/-1.1 d
(or 185.5/f with f=2,3 or 4) and a spin period of ~66 s, parameters typical of
a Be/X-ray binary. The outbursts last ~12 d. A spin-down of 0.08+/-0.02 s/yr is
also observed, very likely due to the propeller effect. The most accurate X-ray
position is R.A. (2000) =17h49m06.8s and Dec. = -27deg32'32".5 (unc. 2"). The
high-energy broad-band spectrum is well-fitted with an absorbed powerlaw and a
high-energy cutoff with values NH=(20+/-1)e22 cm-2, Gamma=1.0+/-0.1, and
Ecut=21+/-3 keV. The only optical/NIR candidate counterpart within the X-ray
error circle has magnitudes of R=21.9+/-0.1, I=20.92+/-0.09, J=17.42+/-0.03,
H=16.71+/-0.02, and Ks=15.75+/-0.07, which points towards a Be star located far
away (> 8.5 kpc) and highly absorbed (NH~1.7e22 cm-2). The average 22-50 keV
luminosity is (0.4-0.9)e36 erg/s during the long outbursts and 3e36 erg/s
during the bright flare that occurred on MJD 52891 for an assumed distance of
8.5 kpc.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:10:49 GMT"
},
{
"version": "v2",
"created": "Sat, 6 Sep 2008 15:10:03 GMT"
}
] | 2008-09-08T00:00:00 | [
[
"Heras",
"J. A. Zurita",
"",
"AIM/CEA Saclay"
],
[
"Chaty",
"S.",
"",
"AIM/CEA Saclay"
]
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801.3804 | Yurko Duda | Pedro Orea and Yurko Duda | On the corresponding states law of the Yukawa fluid | null | J. Chem. Phys. 128,134508(2008) | 10.1063/1.2883694 | null | cond-mat.stat-mech cond-mat.soft | null | We have analyzed the currently available simulation results, as well as
performed some additional Monte Carlo simulation for the hard-core attractive
Yukawa fluid in order to study its corresponding state behavior. We show that
the values of reduced surface tension map onto the master curve, and a
universal equation of state can be obtained in the wide range of the attractive
Yukawa tail length after a certain re-scaling of the number density. Some
comparisons with other nonconformal potentials are presented and discussed.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:26:00 GMT"
}
] | 2008-05-31T00:00:00 | [
[
"Orea",
"Pedro",
""
],
[
"Duda",
"Yurko",
""
]
] | [
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801.3805 | Sam Dolan Dr | Sam R. Dolan | Scattering and absorption of gravitational plane waves by rotating black
holes | 43 pages, 17 figures. To match published version | Class.Quant.Grav.25:235002,2008 | 10.1088/0264-9381/25/23/235002 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a study of the scattering and absorption of planar gravitational
waves by a Kerr black hole in vacuum. We apply the partial wave method to
compute cross sections for the special case of radiation incident along the
rotation axis. A catalogue of numerically-accurate cross sections is presented,
for a range of incident wavelengths $M\omega \le 4$ and rotation rates $a \le
0.999M$. Three effects are studied in detail: polarization, helicity-reversal
and glory scattering. First, a new approximation to the polarization in the
long-wavelength limit is derived. We show that black hole rotation
distinguishes between co- and counter-rotating wave helicities, leading to a
term in the cross section proportional to $a\omega$. Second, we confirm that
helicity is not conserved by the scattering process, and show that
superradiance amplifies the effect. For certain wavelengths, the back-scattered
flux is enhanced by as much as $\sim 35$ times for a rapidly-rotating hole
(e.g. for $a = 0.999M$ at $M\omega = 0.945$). Third, we observe regular glory
and spiral scattering peaks in the numerically-determined cross sections. We
show that the angular width and intensity of the peaks may be estimated via a
semi-classical approximation. We conclude with a discussion of the observable
implications of our results.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:47:07 GMT"
},
{
"version": "v2",
"created": "Mon, 12 May 2008 19:21:10 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Nov 2008 14:42:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dolan",
"Sam R.",
""
]
] | [
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801.3806 | Ignacio Franco | Ignacio Franco and Paul Brumer | Minimum requirements for laser-induced symmetry breaking in quantum and
classical mechanics | 12 pages, to appear in J. Phys. B. (Special issue on Coherent
Control, March 2008) | null | 10.1088/0953-4075/41/7/074003 | null | quant-ph | null | Necessary conditions for generating phase controllable asymmetry in spatially
symmetric systems using lasers are identified and are shown to be identical in
quantum and classical mechanics. First, by studying the exact dynamics of
harmonic systems in the presence of an arbitrary radiation field, it is
demonstrated that anharmonicities in the system's potential are a necessary
requirement for phase controllability. Then, by analyzing the space-time
symmetries of the laser-driven Liouville dynamics for classical and quantum
systems, a common set of temporal symmetries for the driving field that need to
be violated to induce transport are identified. The conditions apply to
continuous wave lasers and to symmetry breaking effects that do not rely on the
control of the absolute phase of the field. Known examples of laser fields that
can induce transport in symmetric systems are seen to be particular cases of
these symmetry constraints.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:33:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Franco",
"Ignacio",
""
],
[
"Brumer",
"Paul",
""
]
] | [
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] |
801.3807 | Peter Noerdlinger PhD | Peter D. Noerdlinger | Solar Mass Loss, the Astronomical Unit, and the Scale of the Solar
System | 31 pages, submitted to Celestial Mechanics and Dynamical Astronomy | null | null | null | astro-ph | null | The radiative and particulate loss of mass by the Sun, -9.13*10^-14 Solar
masses per year or more causes the orbits of the planets to expand at the same
rate, and their periods to lengthen at twice this rate. Unfortunately, under
the present definition of the Astronomical Unit (AU) based on the fixed
Gaussian gravity constant kGS = 0.01720209895 (AU)^1.5/day, the value AUmet of
the AU in meters must decrease at 1/3 this rate, all these rates being
expressed logarithmically. The progress of the planets along their orbits slows
quadratically with time. For example, in one century Mercury would lag behind
the position predicted using constant solar mass by almost 1.4 km, in two
centuries 5.5 km. The value of AUmet can be made constant by redefining it,
based on a reference solar mass unit, such as the solar mass at J2000; else,
the solar Gaussian gravity constant kGS used in defining the AU could be
redefined proportional to the square root of the solar mass. Improved accuracy
of the ephemerides would impose useful bounds on losses due to axion emission
(Sikivie 2005). With no axion emission the Earth's semi-major axis grows 1.37
m/cy; with the maximum allowable such emission the result is 1.57 m/cy. Under
reasonable assumptions about alternate gravity theories, radar delay data are
used to show that the effect of a changing Newtonian gravity constant is
negligible.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:35:14 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Noerdlinger",
"Peter D.",
""
]
] | [
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801.3808 | Sergey Sibiryakov | G. Dvali, S. Sibiryakov | Creating semiclassical black holes in collider experiments and keeping
them on a string | Journal version, a misprint corrected | JHEP0803:007,2008 | 10.1088/1126-6708/2008/03/007 | CERN-PH-TH/2008-017 | hep-th hep-ph | null | We argue that a simple modification of the TeV scale quantum gravity scenario
allows production of semiclassical black holes in particle collisions at the
LHC. The key idea is that in models with large extra dimensions the strength of
gravity in the bulk can be higher than on the brane where we live. A well-known
example of this situation is the case of warped extra dimensions. Even if the
energy of the collision is not sufficient to create a black hole on the brane,
it may be enough to produce a particle which accelerates into the bulk up to
trans-Planckian energy and creates a large black hole there. In a concrete
model we consider, the black hole is formed in a collision of the particle with
its own image at an orbifold plane. When the particle in question carries some
Standard Model gauge charges the created black hole gets attached to our brane
by a string of the gauge flux. For a 4-dimensional observer such system looks
as a long-lived charged state with the mass continuously decreasing due to
Hawking evaporation of the black hole. This provides a distinctive signature of
black hole formation in our scenario.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 17:43:33 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 09:45:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dvali",
"G.",
""
],
[
"Sibiryakov",
"S.",
""
]
] | [
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] |
801.3809 | Graziano Crasta | G. Crasta, S. Finzi Vita | An existence result for the sandpile problem on flat tables with walls | 15 pages, 11 figures | Netw. Heterog. Media 3 (2008), pp. 815-830 | 10.3934/nhm.2008.3.815 | Roma01.Math.AP | math.AP | null | We derive an existence result for solutions of a differential system which
characterizes the equilibria of a particular model in granular matter theory,
the so-called partially open table problem for growing sandpiles. Such result
generalizes a recent theorem of Cannarsa and Cardaliaguet established for the
totally open table problem. Here, due to the presence of walls at the boundary,
the surface flow density at the equilibrium may result no more continuous nor
bounded, and its explicit mathematical characterization is obtained by domain
decomposition techniques. At the same time we show how these solutions can be
numerically computed as stationary solutions of a dynamical two-layer model for
growing sandpiles and we present the results of some simulations.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:07:02 GMT"
}
] | 2019-07-25T00:00:00 | [
[
"Crasta",
"G.",
""
],
[
"Vita",
"S. Finzi",
""
]
] | [
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] |
801.381 | Irfan Chaudhary | Peter L Hagelstein, Irfan U Chaudhary | Electron mass shift in nonthermal systems | 23 pages, 5 figures | null | 10.1088/0953-4075/41/12/125001 | null | quant-ph | null | The electron mass is known to be sensitive to local fluctuations in the
electromagnetic field, and undergoes a small shift in a thermal field. It was
claimed recently that a very large electron mass shift should be expected near
the surface of a metal hydride [{\it Eur. Phys. J. C}, {\bf 46} 107 (2006)]. We
examine the shift using a formulation based on the Coulomb gauge, which leads
to a much smaller shift. The maximization of the electron mass shift under
nonequilibrium conditions seems nonetheless to be an interesting problem. We
consider a scheme in which a current in a hollow wire produces a large vector
potential in the wire center. Fluctuations in an LC circuit with nearly matched
loss and gain can produce large current fluctuations; and these can increase
the electron mass shift by orders of magnitude over its room temperature value.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:12:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hagelstein",
"Peter L",
""
],
[
"Chaudhary",
"Irfan U",
""
]
] | [
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] |
801.3811 | Franck Doray | Franck Doray | Vari\'et\'es homog\`enes sous $\PGL_n$ | 35 pages | null | null | null | math.AG | null | Let $A$ be an Azumaya algebra over a field. If $G$ is the group of
automorphisms of $A$ and $X$ denotes a projective homogeneous variety under
$G$, we construct in a very explicit way and under suitable hypotheses a bundle
$\mathcal{V}$ on $S$, where $S$ is a (generalized) Severi-Brauer variety
associated to $A$, and a canonical isomorphism between $X$ and a flag bundle on
$\mathcal{V}$. This allows to explicitely compute Chow groups of $X$ in terms
of the Chow groups of $S$.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:15:43 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Doray",
"Franck",
""
]
] | [
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] |
801.3812 | Akikazu Hashimoto | Danny Dhokarh, Sheikh Shajidul Haque, and Akikazu Hashimoto | Melvin Twists of global AdS_5 \times S_5 and their Non-Commutative Field
Theory Dual | 17 pages, references added | JHEP 0808:084,2008 | 10.1088/1126-6708/2008/08/084 | MAD-TH-08-02 | hep-th | null | We consider the Melvin Twist of AdS_5 \times S_5 under U(1) \times U(1)
isometry of the boundary S_3 of the global AdS_5 geometry and identify its
field theory dual. We also study the thermodynamics of the Melvin deformed
theory.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:47:32 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 22:02:28 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Dhokarh",
"Danny",
""
],
[
"Haque",
"Sheikh Shajidul",
""
],
[
"Hashimoto",
"Akikazu",
""
]
] | [
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801.3813 | Kasso Okoudjou | Brody D. Johnson and Kasso A. Okoudjou | Frame potential and finite abelian groups | null | null | null | null | math.CA math.FA | null | This article continues a prior investigation of the authors with the goal of
extending characterization results of convolutional tight frames from the
context of cyclic groups to general finite abelian groups. The collections
studied are formed by translating a number of \emph{generators} by elements of
a fixed subgroup and it is shown, under certain norm conditions, that tight
frames with this structure are characterized as local minimizers of the frame
potential. Natural analogs to the downsampling and upsampling operators of
finite cyclic groups are studied for arbitrary subgroups of finite abelian
groups. Directions of further study are also proposed.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:22:47 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Johnson",
"Brody D.",
""
],
[
"Okoudjou",
"Kasso A.",
""
]
] | [
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] |
801.3814 | Monique Arnaud | M. Arnaud (Service d'Astrophysique CEA-Saclay, France) | Non thermal emission in clusters of galaxies | 6 pages, 7 figures, invited talk at the International Workshop,
"Simbol X: The Hard X-ray Universe in Focus", held in Bologna 14-16 May 2007.
To be published in Memorie della Societa' Astronomica Italiana | null | null | null | astro-ph | null | I briefly review our current knowledge of the non thermal emission from
galaxy clusters and discuss future prospect with Simbol-X. Simbol-X will map
the hard X-ray emission in clusters, determine its origin and disentangle the
thermal and non-thermal components. Correlated with radio observations, the
observation of the non-thermal X-ray emission, when confirmed, will allow to
map both the magnetic field and the relativistic electron properties, key
information to understand the origin and acceleration of relativistic particles
in clusters and its impact on cluster evolution.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:37:21 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Arnaud",
"M.",
"",
"Service d'Astrophysique CEA-Saclay, France"
]
] | [
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] |
801.3815 | Neil Dobbs | Neil Dobbs | On cusps and flat tops | 32 pages, some revisions from the previous version (thanks again,
referee!), but the substance remains the same. This version is from Dec 2012 | Annales de l'institut Fourier, 64 no. 2 (2014), p. 571-605 | 10.5802/aif.2858 | null | math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop non-invertible Pesin theory for a new class of maps called cusp
maps. These maps may have unbounded derivative, but nevertheless verify a
property analogous to $C^{1+\epsilon}$. We do not require the critical points
to verify a non-flatness condition, so the results are applicable to
$C^{1+\epsilon}$ maps with flat critical points. If the critical points are too
flat, then no absolutely continuous invariant probability measure can exist.
This generalises a result of Benedicks and Misiurewicz.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:39:43 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Mar 2011 15:36:54 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Apr 2013 11:55:31 GMT"
}
] | 2015-02-18T00:00:00 | [
[
"Dobbs",
"Neil",
""
]
] | [
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] |
801.3816 | Julien Langou | Phantipa Thipwiwatpotjana and Weldon A. Lodwick | Algorithm for solving optimization problems with Interval Valued
Probability Measure | 15 pages | null | null | UC Denver CCM technical report #264 | math.OC math.PR | null | We are concerned with three types of uncertainties: probabilistic,
possibilitistic and interval. By using possibility and necessity measures as an
Interval Valued Probability Measure (IVPM), we present IVPM's interval expected
values whose possibility distributions are in the form of polynomials. By
working with interval expected values of independent uncertainty coefficients
in a linear optimization problem together with operations suggested in Lodwick
and Jamison (2007), the problem after applying these operations becomes a
linear programming problem with constant coefficients. This is achieved by the
application of two functions. The first is applied to the interval
coefficients, v: I -> R^k, where I= {[a,b] | a <= b}. The second is u: R^k ->
R, applied to the product we got from a previous function. Similar concepts
hold for any types of optimization problems with linear constraints. Moreover,
it implied that optimization problems containing all three types of
uncertainties in one problem can be solved as ordinary optimization problems.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:51:05 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Thipwiwatpotjana",
"Phantipa",
""
],
[
"Lodwick",
"Weldon A.",
""
]
] | [
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] |
801.3817 | Tuomo Kakkonen | Tuomo Kakkonen | Robustness Evaluation of Two CCG, a PCFG and a Link Grammar Parsers | null | Proceedings of the 3rd Language & Technology Conference: Human
Language Technologies as a Challenge for Computer Science and Linguistics.
Poznan, Poland, 2007 | null | null | cs.CL | null | Robustness in a parser refers to an ability to deal with exceptional
phenomena. A parser is robust if it deals with phenomena outside its normal
range of inputs. This paper reports on a series of robustness evaluations of
state-of-the-art parsers in which we concentrated on one aspect of robustness:
its ability to parse sentences containing misspelled words. We propose two
measures for robustness evaluation based on a comparison of a parser's output
for grammatical input sentences and their noisy counterparts. In this paper, we
use these measures to compare the overall robustness of the four evaluated
parsers, and we present an analysis of the decline in parser performance with
increasing error levels. Our results indicate that performance typically
declines tens of percentage units when parsers are presented with texts
containing misspellings. When it was tested on our purpose-built test set of
443 sentences, the best parser in the experiment (C&C parser) was able to
return exactly the same parse tree for the grammatical and ungrammatical
sentences for 60.8%, 34.0% and 14.9% of the sentences with one, two or three
misspelled words respectively.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:41:01 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Kakkonen",
"Tuomo",
""
]
] | [
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] |
801.3818 | Saeqa Vrtilek | Saeqa D. Vrtilek | Multiwavelength Studies of X-ray Binaries | 5 pages including figures, in conference proceedings A Population
Explosion: The Nature and Evolution of X-ray Binaries in Diverse
Environments, eds. Bandyopadhyay, Wachter, Gelino, & Gelino | AIP Conf.Proc.1010:18-22,2008 | 10.1063/1.2945037 | null | astro-ph | null | Simultaneous multiwavelength studies of X-ray binaries have been remarkably
successful and resulted in improved physical constraints, a new understanding
of the dependence of mass accretion rate on X-ray state, as well as insights on
the time-dependent relationship between disk structure and mass-transfer rate.
I will give some examples of the tremendous gains we have obtained in our
understanding of XRBs by using multiwavelength observations. I will end with an
appeal that while Spitzer cryogens are still available a special effort be put
forth to obtaining coordinated observations including the mid-infrared: Whereas
the optical and near-IR originate as superpositions of the secondary star and
of accretion processes, the mid-IR crucially detects jet synchrotron emission
from NSs that is virtually immeasurable at other wavelengths. A further benefit
of Spitzer observations is that mid-infrared wavelengths can easily penetrate
regions that are heavily obscured. Many X-ray binaries lie in the Galactic
plane and as such are often heavily obscured in the optical by interstellar
extinction. The infrared component of the SED, vital to the study of jets and
dust, can be provided {\it only} by Spitzer; in the X-rays we currently have an
unprecedented six satellites available and in the optical and radio dozens of
ground-based facilities to complement the Spitzer observations.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:59:25 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Vrtilek",
"Saeqa D.",
""
]
] | [
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801.3819 | Takahiro Kitayama | Takahiro Kitayama | Symmetry of Reidemeister torsion on $SU_2$-representation spaces of
knots | 18 pages, 2 figures; 11 pages, 2 figures, rewritten in terms of
Reidemeister torsion instead of twisted Alexander invariants; 12 pages, 2
figures, to appear in Topology and its Applications | Topology Appl. 156 (2009) 2772-2781 | null | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two sorts of actions on the space of conjugacy classes of
irreducible $SU_2$-representations of a knot group. One of them is an
involution which comes from the algebraic structure of $SU_2$ and the other is
the action by the outer automorphism group of the knot group. In particular, we
consider them on an 1-dimensional smooth part of the space, which is
canonically oriented and metrized via a Reidemeister torsion volume form. As an
application we show that the Reidemeister torsion function on the 1-dimensional
subspace has symmetry about the metrization.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:54:28 GMT"
},
{
"version": "v2",
"created": "Sun, 28 Dec 2008 14:38:27 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Sep 2009 08:16:23 GMT"
}
] | 2009-09-17T00:00:00 | [
[
"Kitayama",
"Takahiro",
""
]
] | [
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] |
801.382 | Adolfo Malbouisson | G. Flores-Hidalgo, C.A. Linhares, A.P.C. Malbouisson, J.M.C.
Malbouisson | Time evolution of a superposition of dressed oscillator states in a
cavity | 15 pages, LATEX, 3 figures; version to appear in J. Phys. A - Math.
Theor | null | 10.1088/1751-8113/41/7/075404 | null | quant-ph cond-mat.other hep-th math-ph math.MP | null | Using the formalism of {\it renormalized} coordinates and \textit{dressed}
states introduced in previous publications, we perform a nonperturbative study
of the time evolution of a superposition of two states, the ground state and
the first excited level of a harmonic oscillator, the system being confined in
a perfectly reflecting cavity of radius $R$. For $R\to\infty$, we find
dissipation with dominance of the interference terms of the density matrix, in
both weak- and strong-coupling regimes. For small values of $R$ all elements of
the density matrix present an oscillatory behavior as times goes on and the
system is not dissipative. In both cases, we obtain improved theoretical
results with respect to those coming from perturbation theory.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 18:59:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Flores-Hidalgo",
"G.",
""
],
[
"Linhares",
"C. A.",
""
],
[
"Malbouisson",
"A. P. C.",
""
],
[
"Malbouisson",
"J. M. C.",
""
]
] | [
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] |
801.3821 | Stefan Leupold | M.F.M. Lutz and S. Leupold | On the radiative decays of light vector and axial-vector mesons | added appendix concerning double-counting issues | Nucl.Phys.A813:96-170,2008 | 10.1016/j.nuclphysa.2008.09.005 | null | nucl-th hep-ph | null | We study the light vector and axial-vector mesons. According to the
hadrogenesis conjecture the nature of the two types of states is distinct. The
axial-vector mesons are generated dynamically by coupled-channel interactions
based on the chiral Lagrangian written down in terms of the Goldstone bosons
and the light vector mesons. We propose a novel counting scheme that arises if
the chiral Lagrangian is supplemented by constraints from large-N_c QCD in the
context of the hadrogenesis conjecture. The counting scheme is successfully
tested by a systematic study of the properties of vector mesons. The spectrum
of light axial-vector mesons is derived relying on the leading order
interaction of the Goldstone bosons with the vector mesons supplemented by a
phenomenology for correction terms. The f_1(1282), b_1(1230), h_1(1386),
a_1(1230) and K_1(1272) mesons are recovered as molecular states. Based on
those results the one-loop contributions to the electromagnetic decay
amplitudes of axial-vector molecules into pseudo-scalar or vector mesons are
evaluated systematically. In order to arrive at gauge invariant results in a
transparent manner we choose to represent the vector particles by
anti-symmetric tensor fields. It is emphasized that there are no tree-level
contributions to a radiative decay amplitude of a given state if that state is
generated by coupled-channel dynamics. The inclusion of the latter would be
double counting. At present we restrict ourselves to loops where a vector and a
pseudo-scalar meson couple to the axial-vector molecule. We argue that final
and predictive results require further computations involving intermediate
states with two vector mesons. The relevance of the latter is predicted by our
counting rules.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:01:31 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 18:45:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lutz",
"M. F. M.",
""
],
[
"Leupold",
"S.",
""
]
] | [
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801.3822 | Marcos Lima | Marcos Lima, Carlos E. Cunha, Hiroaki Oyaizu (KICP, U. Chicago),
Joshua Frieman (FNAL, KICP, U. Chicago), Huan Lin (FNAL), Erin S. Sheldon
(NYU) | Estimating the Redshift Distribution of Faint Galaxy Samples | 14 pages, 9 figures, submitted to MNRAS | Mon.Not.Roy.Astron.Soc.390:118,2008 | 10.1111/j.1365-2966.2008.13510.x | null | astro-ph | null | We present an empirical method for estimating the underlying redshift
distribution N(z) of galaxy photometric samples from photometric observables.
The method does not rely on photometric redshift (photo-z) estimates for
individual galaxies, which typically suffer from biases. Instead, it assigns
weights to galaxies in a spectroscopic subsample such that the weighted
distributions of photometric observables (e.g., multi-band magnitudes) match
the corresponding distributions for the photometric sample. The weights are
estimated using a nearest-neighbor technique that ensures stability in sparsely
populated regions of color-magnitude space. The derived weights are then summed
in redshift bins to create the redshift distribution. We apply this weighting
technique to data from the Sloan Digital Sky Survey as well as to mock catalogs
for the Dark Energy Survey, and compare the results to those from the
estimation of photo-z's derived by a neural network algorithm. We find that the
weighting method accurately recovers the underlying redshift distribution,
typically better than the photo-z reconstruction, provided the spectroscopic
subsample spans the range of photometric observables covered by the photometric
sample.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:10:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lima",
"Marcos",
"",
"KICP, U. Chicago"
],
[
"Cunha",
"Carlos E.",
"",
"KICP, U. Chicago"
],
[
"Oyaizu",
"Hiroaki",
"",
"KICP, U. Chicago"
],
[
"Frieman",
"Joshua",
"",
"FNAL, KICP, U. Chicago"
],
[
"Lin",
"Huan",
"",
"FNAL"
],
[
"Sheldon",
"Erin S.",
"",
"NYU"
]
] | [
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801.3823 | Shailesh Chandrasekharan | D.J. Cecile and Shailesh Chandrasekharan | Role of the $\sigma$-resonance in determining the convergence of chiral
perturbation theory | 5 pages, 6 figures, revtex format | Phys.Rev.D77:091501,2008 | 10.1103/PhysRevD.77.091501 | null | hep-lat hep-ph nucl-th | null | The dimensionless parameter $\xi = M_\pi^2/(16 \pi^2 F_\pi^2)$, where $F_\pi$
is the pion decay constant and $M_\pi$ is the pion mass, is expected to control
the convergence of chiral perturbation theory applicable to QCD. Here we
demonstrate that a strongly coupled lattice gauge theory model with the same
symmetries as two-flavor QCD but with a much lighter $\sigma$-resonance is
different. Our model allows us to study efficiently the convergence of chiral
perturbation theory as a function of $\xi$. We first confirm that the leading
low energy constants appearing in the chiral Lagrangian are the same when
calculated from the $p$-regime and the $\epsilon$-regime as expected. However,
$\xi \lesssim 0.002$ is necessary before 1-loop chiral perturbation theory
predicts the data within 1%. For $\xi > 0.0035$ the data begin to deviate
dramatically from 1-loop chiral perturbation theory predictions. We argue that
this qualitative change is due to the presence of a light $\sigma$-resonance in
our model. Our findings may be useful for lattice QCD studies.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:17:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cecile",
"D. J.",
""
],
[
"Chandrasekharan",
"Shailesh",
""
]
] | [
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] |
801.3824 | Chang-Yu Hou | Chang-Yu Hou, Claudio Chamon | Junctions of three quantum wires for spin 1/2 electrons | 9 figures | Phys.Rev.B77:155422,2008 | 10.1103/PhysRevB.77.155422 | null | cond-mat.mes-hall | null | We study the effects of electron-electron interactions on the transport
properties of a junction of three quantum wires enclosing a magnetic flux. The
wires are modeled as single channel spin-1/2 Tomonaga-Luttinger liquids. The
system exhibits a rich phase diagram as a function of the electronic
interaction strength, which includes a chiral fixed point with an asymmetric
current flow highly sensitive to the sign of the flux, and another fixed point
where pair tunneling dominates, similarly to the case of spinless electrons.
While in the case of spinless electrons the perturbations that correspond to
unequal couplings between the three wires are always irrelevant, we find that,
when the electron spin is included, there are small regions in the phase
diagram where a current flows only between two of the wires and the third wire
is decoupled.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:18:31 GMT"
},
{
"version": "v2",
"created": "Wed, 14 May 2008 03:34:50 GMT"
}
] | 2009-01-22T00:00:00 | [
[
"Hou",
"Chang-Yu",
""
],
[
"Chamon",
"Claudio",
""
]
] | [
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] |
801.3825 | Rodger Thompson Prof. | Rodger I. Thompson, Daniel Eisenstein, Xiaohui Fan, Marcia Rieke and
Robert Kennicutt | NICMOS Measurements of the Near Infrared Background | To appear in the proceedings of A Century of Cosmology - Past,
present and future, San Servolo, Venice, Italy, 27-31 August 2007 | Nuovo Cim.B122:941-946,2007 | 10.1393/ncb/i2008-10425-x | null | astro-ph | null | This paper addresses the nature of the near infrared background. We
investigate whether there is an excess background at 1.4 microns, what is the
source of the near infrared background and whether that background after the
subtraction of all known sources contains the signature of high redshift
objects (Z > 10). Based on NICMOS observations in the Hubble Ultra Deep Field
and the Northern Hubble Deep Field we find that there is no excess in the
background at 1.4 microns and that the claimed excess is due to inaccurate
models of the zodiacal background. We find that the near infrared background is
now spatially resolved and is dominated by galaxies in the redshift range
between 0.5 and 1.5. We find no signature than can be attributed to high
redshift sources after subtraction of all known sources either in the residual
background or in the fluctuations of the residual background. We show that the
color of the fluctuations from both NICMOS and Spitzer observations are
consistent with low redshift objects and inconsistent with objects at redshifts
greater than 10. It is most likely that the residual fluctuation power after
source subtraction is due to the outer regions of low redshift galaxies that
are below the source detection limit and therefore not removed during the
source subtraction.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:31:10 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Thompson",
"Rodger I.",
""
],
[
"Eisenstein",
"Daniel",
""
],
[
"Fan",
"Xiaohui",
""
],
[
"Rieke",
"Marcia",
""
],
[
"Kennicutt",
"Robert",
""
]
] | [
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] |
801.3826 | Serkan Hosten | Pierre Dueck, Serkan Hosten and Bernd Sturmfels | Normal Toric Ideals of Low Codimension | null | null | null | null | math.AC math.AG | null | Every normal toric ideal of codimension two is minimally generated by a
Grobner basis with squarefree initial monomials. A polynomial time algorithm is
presented for checking whether a toric ideal of fixed codimension is normal.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:40:48 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 16:21:41 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Dueck",
"Pierre",
""
],
[
"Hosten",
"Serkan",
""
],
[
"Sturmfels",
"Bernd",
""
]
] | [
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] |
801.3827 | Gary Walker | A. A. Abdo, B. Allen, T. Aune, D. Berley, E. Blaufuss, S. Casanova, C.
Chen, B. L. Dingus, R. W. Ellsworth, L. Fleysher, R. Fleysher, M. M.
Gonzales, J. A. Goodman, C. M. Hoffman, P. H. H\"untemeyer, B. E. Kolterman,
C. P. Lansdell, J. T. Linnemann, J. E. McEnery, A. I. Mincer, P. Nemethy, D.
Noyes, J. Pretz, J. M. Ryan, P. M. Saz Parkinson, A. Shoup, G. Sinnis, A. J.
Smith, G. W. Sullivan, V. Vasileiou, G. P. Walker, D. A. Williams, G. B. Yodh | Discovery of Localized Regions of Excess 10-TeV Cosmic Rays | Submitted to PhysRevLett | Phys.Rev.Lett.101:221101,2008 | 10.1103/PhysRevLett.101.221101 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analysis of 7 years of Milagro data performed on a 10-degree angular scale
has found two localized regions of excess of unknown origin with greater than
12 sigma significance. Both regions are inconsistent with gamma-ray emission
with high confidence. One of the regions has a different energy spectrum than
the isotropic cosmic-ray flux at a level of 4.6 sigma, and it is consistent
with hard spectrum protons with an exponential cutoff, with the most
significant excess at ~10 TeV. Potential causes of these excesses are explored,
but no compelling explanations are found.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:46:40 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 21:32:22 GMT"
},
{
"version": "v3",
"created": "Tue, 14 Oct 2008 23:48:40 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Abdo",
"A. A.",
""
],
[
"Allen",
"B.",
""
],
[
"Aune",
"T.",
""
],
[
"Berley",
"D.",
""
],
[
"Blaufuss",
"E.",
""
],
[
"Casanova",
"S.",
""
],
[
"Chen",
"C.",
""
],
[
"Dingus",
"B. L.",
""
],
[
"Ellsworth",
"R. W.",
""
],
[
"Fleysher",
"L.",
""
],
[
"Fleysher",
"R.",
""
],
[
"Gonzales",
"M. M.",
""
],
[
"Goodman",
"J. A.",
""
],
[
"Hoffman",
"C. M.",
""
],
[
"Hüntemeyer",
"P. H.",
""
],
[
"Kolterman",
"B. E.",
""
],
[
"Lansdell",
"C. P.",
""
],
[
"Linnemann",
"J. T.",
""
],
[
"McEnery",
"J. E.",
""
],
[
"Mincer",
"A. I.",
""
],
[
"Nemethy",
"P.",
""
],
[
"Noyes",
"D.",
""
],
[
"Pretz",
"J.",
""
],
[
"Ryan",
"J. M.",
""
],
[
"Parkinson",
"P. M. Saz",
""
],
[
"Shoup",
"A.",
""
],
[
"Sinnis",
"G.",
""
],
[
"Smith",
"A. J.",
""
],
[
"Sullivan",
"G. W.",
""
],
[
"Vasileiou",
"V.",
""
],
[
"Walker",
"G. P.",
""
],
[
"Williams",
"D. A.",
""
],
[
"Yodh",
"G. B.",
""
]
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801.3828 | Nikolai Priezjev V. | Anoosheh Niavarani and Nikolai V. Priezjev | Rheological study of polymer flow past rough surfaces with slip boundary
conditions | 22 pages, 11 figures; Web reference added for animations:
http://www.egr.msu.edu/~priezjev/roughness/text.htm | J. Chem. Phys. 129, 144902 (2008) | 10.1063/1.2988496 | null | cond-mat.soft cond-mat.mtrl-sci physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The slip phenomena in thin polymer films confined by either flat or
periodically corrugated surfaces are investigated by molecular dynamics and
continuum simulations. For atomically flat surfaces and weak wall-fluid
interactions, the shear rate dependence of the slip length has a distinct local
minimum which is followed by a rapid increase at higher shear rates. For
corrugated surfaces with wavelength larger than the radius of gyration of
polymer chains, the effective slip length decays monotonically with increasing
corrugation amplitude. At small amplitudes, this decay is reproduced accurately
by the numerical solution of the Stokes equation with constant and
rate-dependent local slip length. When the corrugation wavelength is comparable
to the radius of gyration, the continuum predictions overestimate the effective
slip length obtained from molecular dynamics simulations. The analysis of the
conformational properties indicates that polymer chains tend to stretch in the
direction of shear flow above the crests of the wavy surface.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:48:04 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Aug 2008 01:37:36 GMT"
}
] | 2008-10-15T00:00:00 | [
[
"Niavarani",
"Anoosheh",
""
],
[
"Priezjev",
"Nikolai V.",
""
]
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] |
801.3829 | Yuriy Semenov G | Y. G. Semenov, K. W. Kim, J. M. Zavada | Ferromagnet proximity effects and magnetoresistance of bilayer graphene | 9 pages, 4 figures | null | null | null | cond-mat.mtrl-sci | null | A drastic modification of electronic band structure is predicted in bilayer
graphene when it is placed between two ferromagnetic insulators. Due to the
exchange interaction with the proximate ferromagnet, the electronic energy
dispersion in the graphene channel strongly depends on the magnetization
orientation of two ferromagnetic layers, $\mathbf{M_{1}}$ and $\mathbf{M_{2}}
$. While the parallel configuration $\mathbf{M_{1}}= \mathbf{M_{2}}$ leads to
simple spin splitting of both conduction and valence bands, an energy gap is
induced as soon as the angle $\theta$ between $\mathbf{M_{1}}$ and $%
\mathbf{M_{2}}$ becomes non-zero with the maximum achieved at $\theta=\pi$
(i.e., antiparallel alignment). Consequently, bilayer graphene may exhibit a
sizable magnetoresistive effect in the current-in-plane configuration. A rough
estimate suggests the resistance changes on the order of tens of percent at
room temperature. This effect is expected to become more pronounced as the
temperatures decreases.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:51:35 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Apr 2008 16:38:25 GMT"
}
] | 2008-04-04T00:00:00 | [
[
"Semenov",
"Y. G.",
""
],
[
"Kim",
"K. W.",
""
],
[
"Zavada",
"J. M.",
""
]
] | [
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801.383 | Gerald Marsh | Gerald E. Marsh | Climate Stability and Policy: A Synthesis | 19 pages, 6 figures | Energy & Environment Vol. 22, No. 8, p. 1085 (2011) | null | null | physics.gen-ph | null | During most of the Phanerozoic eon, which began about a half-billion years
ago, there were few glacial intervals until the late Pliocene 2.75 million
years ago. Beginning at that time, the Earth's climate entered a period of
instability with the onset of cyclical ice ages. At first these had a 41,000
year cycle, and about 1 million years ago the period lengthened to 100,000
years, which has continued to the present. Over this period of instability the
climate has been extraordinarily sensitive to small forcings, whether due to
Milankovitch cycles, solar variations, aerosols, or albedo variations driven by
cosmic rays. The current interglacial has lasted for some ten thousand
years-about the duration of past interglacials-and serious policy
considerations arise as it nears its likely end. It is extremely unlikely that
the current rise in carbon dioxide concentration-some 30% since 1750, and
projected further increase over the next few decades-will significantly
postpone the next glaciation.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 19:54:49 GMT"
}
] | 2012-02-22T00:00:00 | [
[
"Marsh",
"Gerald E.",
""
]
] | [
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801.3831 | Jeremy O'Brien | Anthony Laing, Terry Rudolph, Jeremy L. O'Brien | Experimental Quantum Process Discrimination | 4 pages, 3 figures, comments welcome. Revised version includes
multi-partite QPD | Phys. Rev. Lett. 102, 160502 (2009) | 10.1103/PhysRevLett.102.160502 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Discrimination between unknown processes chosen from a finite set is
experimentally shown to be possible even in the case of non-orthogonal
processes. We demonstrate unambiguous deterministic quantum process
discrimination (QPD) of non-orthogonal processes using properties of
entanglement, additional known unitaries, or higher dimensional systems. Single
qubit measurement and unitary processes and multipartite unitaries (where the
unitary acts non-separably across two distant locations) acting on photons are
discriminated with a confidence of $\geq97%$ in all cases.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:07:06 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jul 2008 15:27:36 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Laing",
"Anthony",
""
],
[
"Rudolph",
"Terry",
""
],
[
"O'Brien",
"Jeremy L.",
""
]
] | [
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] |
801.3832 | Michael Schnabel | Michael Schnabel, Matthias Kaschube and Fred Wolf | Pinwheel stability, pattern selection and the geometry of visual space | 5 pages, 5 figures | null | null | null | q-bio.NC nlin.PS physics.bio-ph | null | It has been proposed that the dynamical stability of topological defects in
the visual cortex reflects the Euclidean symmetry of the visual world. We
analyze defect stability and pattern selection in a generalized Swift-Hohenberg
model of visual cortical development symmetric under the Euclidean group E(2).
Euclidean symmetry strongly influences the geometry and multistability of model
solutions but does not directly impact on defect stability.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:42:26 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 23:07:20 GMT"
}
] | 2008-01-30T00:00:00 | [
[
"Schnabel",
"Michael",
""
],
[
"Kaschube",
"Matthias",
""
],
[
"Wolf",
"Fred",
""
]
] | [
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] |
801.3833 | Nicholas Abel | N. P. Abel, S. R. Federman and P. C. Stancil | The Effects of Doubly Ionized Chemistry on SH+ and S^+2 Abundances in
X-ray Dominated Regions | 19 pages, 3 figures, Accepted for Publication in ApJ Letters | null | 10.1086/533465 | null | astro-ph | null | Recent laboratory measurements for the S^+2 + H2 reaction find a total rate
coefficient significantly larger than previously used in theoretical models of
X-ray dominated regions (XDRs). While the branching ratio of the products is
unknown, one energetically possible route leads to the SH+ molecule, a known
XDR diagnostic. In this work, we study the effects of S^+2 on the formation of
SH+ and the destruction of S^+2 in XDRs. We find the predicted SH+ column
density for molecular gas surrounding an Active Galactic Nucleus (AGN)
increases by as much as 2 dex. As long as the branching ratio for S^+2 + H2 ->
SH+ + H+ exceeds a few percent, doubly ionized chemistry will be the dominant
pathway to SH+, which then initiates the formation of other sulfur-bearing
molecules. We also find that the high rate of S^+2 + H2 efficiently destroys
S^+2 once H2 forms, while the S^+2 abundance remains high in the atomic
hydrogen region. We discuss the possible consequences of S^+2 in the atomic
hydrogen region on mid-infrared diagnostics. The enhanced SH+ abundance has
important implications in the study of XDRs, while our conclusions for S^+2
could potentially impact the interpretation of Spitzer and SOFIA observations.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:22:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Abel",
"N. P.",
""
],
[
"Federman",
"S. R.",
""
],
[
"Stancil",
"P. C.",
""
]
] | [
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] |
801.3834 | Magali Rocher | Magali Rocher (IMB) | Large p-groups actions with a p-elementary abelian second ramification
group | null | Journal of Algebra 321, 2 (2009) 704-740 | null | null | math.AG math.NT | null | Let $k$ be an algebraically closed field of characteristic $p>0$ and $C$ a
connected nonsingular projective curve over $k$ with genus $g \geq 2$. Let
$(C,G)$ be a "big action", i.e. a pair $(C,G)$ where $G$ is a $p$-subgroup of
the $k$-automorphism group of $C$ such that$\frac{|G|}{g} >\frac{2 p}{p-1}$. We
denote by $G_2$ the second ramification group of $G$ at the unique ramification
point of the cover $C \to C/G$. The aim of this paper is to describe the big
actions whose $G_2$ is $p$-elementary abelian. In particular, we obtain a
structure theorem by considering the $k$-algebra generated by the additive
polynomials. We more specifically explore the case where there is a maximal
number of jumps in the ramification filtration of $G_2$. In this case, we
display some universal families.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:33:57 GMT"
}
] | 2009-05-21T00:00:00 | [
[
"Rocher",
"Magali",
"",
"IMB"
]
] | [
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] |
801.3835 | Ren? Schoof | Rene Schoof | Computing Arakelov class groups | 41 pages | null | null | null | math.NT | null | Shanks's infrastructure algorithm and Buchmann's algorithm for computing
class groups and unit groups of rings of integers of algebraic number fields
are most naturally viewed as computations inside Arakelov class groups. In this
paper we discuss the basic properties of Arakelov class groups and of the set
of reduced Arakelov divisors. As an application we describe Buchmann's
algorithm in this context.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:35:10 GMT"
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] | 2008-01-25T00:00:00 | [
[
"Schoof",
"Rene",
""
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801.3836 | Josh Guffin | Josh Guffin and Eric Sharpe | A-twisted Landau-Ginzburg models | 64 Pages, LaTeX | J. Geom. Phys. 59 (2009) 1547-1580 | 10.1016/j.geomphys.2009.07.014 | VPI-IPNAS-08-01, ILL-TH-08-1 | hep-th | null | In this paper we discuss correlation functions in certain A-twisted
Landau-Ginzburg models. Although B-twisted Landau-Ginzburg models have been
discussed extensively in the literature, virtually no work has been done on
A-twisted theories. In particular, we study examples of Landau-Ginzburg models
over topologically nontrivial spaces - not just vector spaces - away from
large-radius limits, so that one expects nontrivial curve corrections. By
studying examples of Landau-Ginzburg models in the same universality class as
nonlinear sigma models on nontrivial Calabi-Yaus, we obtain nontrivial tests of
our methods as well as a physical realization of some simple examples of
virtual fundamental class computations.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:36:02 GMT"
}
] | 2017-08-31T00:00:00 | [
[
"Guffin",
"Josh",
""
],
[
"Sharpe",
"Eric",
""
]
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801.3837 | Pierre Moulin | Pierre Moulin | Universal Fingerprinting: Capacity and Random-Coding Exponents | 69 pages, revised | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies fingerprinting (traitor tracing) games in which the number
of colluders and the collusion channel are unknown. The fingerprints are
embedded into host sequences representing signals to be protected and provide
the receiver with the capability to trace back pirated copies to the colluders.
The colluders and the fingerprint embedder are subject to signal fidelity
constraints. Our problem setup unifies the signal-distortion and Boneh-Shaw
formulations of fingerprinting. The fundamental tradeoffs between fingerprint
codelength, number of users, number of colluders, fidelity constraints, and
decoding reliability are then determined. Several bounds on fingerprinting
capacity have been presented in recent literature. This paper derives exact
capacity formulas and presents a new randomized fingerprinting scheme with the
following properties: (1) the encoder and receiver assume a nominal coalition
size but do not need to know the actual coalition size and the collusion
channel; (2) a tunable parameter $\Delta$ trades off false-positive and
false-negative error exponents; (3) the receiver provides a reliability metric
for its decision; and (4) the scheme is capacity-achieving when the
false-positive exponent $\Delta$ tends to zero and the nominal coalition size
coincides with the actual coalition size.
A fundamental component of the new scheme is the use of a "time-sharing"
randomized sequence. The decoder is a maximum penalized mutual information
decoder, where the significance of each candidate coalition is assessed
relative to a threshold, and the penalty is proportional to the coalition size.
A much simpler {\em threshold decoder} that satisfies properties (1)---(3)
above but not (4) is also given.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:37:54 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Dec 2008 17:41:37 GMT"
},
{
"version": "v3",
"created": "Tue, 24 May 2011 22:00:36 GMT"
}
] | 2011-05-26T00:00:00 | [
[
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""
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] |
801.3838 | Jerome Le Rousseau | Hiroshi Isozaki, J\'er\^ome Le Rousseau (LATP, MAPMO) | Pseudodifferential multi-product representation of the solution operator
of a parabolic equation | Comm. Partial Differential Equations to appear (2009) 28 pages | Comm. Partial Differential Equations 34, 7 (2009) 625 - 655 | 10.1080/03605300903017330 | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using a time slicing procedure, we represent the solution operator of a
second-order parabolic pseudodifferential equation on $\R^n$ as an infinite
product of zero-order pseudodifferential operators. A similar representation
formula is proven for parabolic differential equations on a compact Riemannian
manifold. Each operator in the multi-product is given by a simple explicit
Ansatz. The proof is based on an effective use of the Weyl calculus and the
Fefferman-Phong inequality.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:39:30 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Apr 2009 13:08:44 GMT"
}
] | 2009-09-14T00:00:00 | [
[
"Isozaki",
"Hiroshi",
"",
"LATP, MAPMO"
],
[
"Rousseau",
"Jérôme Le",
"",
"LATP, MAPMO"
]
] | [
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] |
801.3839 | Carl E. Carlson | Zainul Abidin and Carl E. Carlson (William and Mary) | Gravitational Form Factors of Vector Mesons in an AdS/QCD Model | 6 pages, 1 figure, three typos corrected in v2 | Phys.Rev.D77:095007,2008 | 10.1103/PhysRevD.77.095007 | null | hep-ph | null | We calculate gravitational form factors of vector mesons using a holographic
model of QCD. These provide restrictions on the generalized parton
distributions of vector mesons, via the sum rules connecting stress tensor form
factors to GPDs. We concentrate on the traceless part of the stress tensor,
which suffices to fix the momentum and angular momentum sum rules. The vector
mesons appear noticeably more compact measured by the gravitational form
factors than by the charge form factor.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:40:55 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 21:05:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Abidin",
"Zainul",
"",
"William and Mary"
],
[
"Carlson",
"Carl E.",
"",
"William and Mary"
]
] | [
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] |
801.384 | Ren? Schoof | Rene Schoof | Four primality testing algorithms | 21 pages | null | null | null | math.NT | null | In this expository paper we describe four primality tests. The first test is
very efficient, but is only capable of proving that a given number is either
composite or 'very probably' prime. The second test is a deterministic
polynomial time algorithm to prove that a given numer is either prime or
composite. The third and fourth primality tests are at present most widely used
in practice. Both tests are capable of proving that a given number is prime or
composite, but neither algorithm is deterministic. The third algorithm exploits
the arithmetic of cyclotomic fields. Its running time is almost, but not quite
polynomial time. The fourth algorithm exploits elliptic curves. Its running
time is difficult to estimate, but it behaves well in practice.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:42:59 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Schoof",
"Rene",
""
]
] | [
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] |
801.3841 | Sumanth Gangasani | Sumanth Kumar Reddy Gangasani | Analysis of Prime Reciprocal Sequences in Base 10 | 12 pages, 1 figure | null | null | null | cs.CR | null | Prime reciprocals have applications in coding and cryptography and for
generation of random sequences. This paper investigates the structural
redundancy of prime reciprocals in base 10 in a manner that parallels an
earlier study for binary prime reciprocals. Several different kinds of
structural relationships amongst the digits in reciprocal sequences are
classified with respect to the digit in the least significant place of the
prime. It is also shown that the frequency of digit 0 exceeds that of every
other digit when the entire set of prime reciprocal sequences is considered.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:51:28 GMT"
}
] | 2008-01-25T00:00:00 | [
[
"Gangasani",
"Sumanth Kumar Reddy",
""
]
] | [
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] |
801.3842 | Bludov Yuliy | M. Salerno, V. V. Konotop, Yu. V. Bludov | Long-living Bloch oscillations of matter waves in optical lattices | Submitted to Phys. Rev. Lett | PHYSICAL REVIEW LETTERS 101, 030405 (2008) | 10.1103/PhysRevLett.101.030405 | null | cond-mat.other nlin.PS | null | It is shown that by properly designing the spatial dependence of the
nonlinearity it is possible to induce long-living Bloch oscillations of a
localized wavepacket in a periodic potential. The results are supported both by
analytical and numerical investigations and are interpreted in terms of matter
wave dynamics displaying dozens of oscillation periods without any visible
distortion of the wave packet.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:51:54 GMT"
}
] | 2008-07-16T00:00:00 | [
[
"Salerno",
"M.",
""
],
[
"Konotop",
"V. V.",
""
],
[
"Bludov",
"Yu. V.",
""
]
] | [
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] |
801.3843 | John Baez | John C. Baez, Danny Stevenson | The Classifying Space of a Topological 2-Group | 31 pages LaTeX, 2 eps figures, a few errors fixed | null | null | null | math.AT math.CT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Categorifying the concept of topological group, one obtains the notion of a
'topological 2-group'. This in turn allows a theory of 'principal 2-bundles'
generalizing the usual theory of principal bundles. It is well-known that under
mild conditions on a topological group G and a space M, principal G-bundles
over M are classified by either the first Cech cohomology of M with
coefficients in G, or the set of homotopy classes [M,BG], where BG is the
classifying space of G. Here we review work by Bartels, Jurco,
Baas-Bokstedt-Kro, and others generalizing this result to topological 2-groups
and even topological 2-categories. We explain various viewpoints on topological
2-groups and Cech cohomology with coefficients in a topological 2-group C, also
known as 'nonabelian cohomology'. Then we give an elementary proof that under
mild conditions on M and C there is a bijection between the first Cech
cohomology of M with coefficients in C and [M,B|C|] where B|C| is the
classifying space of the geometric realization of the nerve of C. Applying this
result to the 'string 2-group' String(G) of a simply-connected compact simple
Lie group G, it follows that principal String(G)-2-bundles have rational
characteristic classes coming from elements of the rational cohomology of BG
modulo the ideal generated by c, where c is any nonzero element in the 4th
cohomology of BG.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:57:03 GMT"
},
{
"version": "v2",
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[
"Baez",
"John C.",
""
],
[
"Stevenson",
"Danny",
""
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801.3844 | Alberto Montina | A. Montina, F. T. Arecchi | Quantum decoherence reduction by increasing the thermal bath temperature | null | Phys. Rev. Lett. 100, 120401 (2008) | 10.1103/PhysRevLett.100.120401 | null | quant-ph | null | The well-known increase of the decoherence rate with the temperature, for a
quantum system coupled to a linear thermal bath, holds no longer for a
different bath dynamics. This is shown by means of a simple classical
non-linear bath, as well as a quantum spin-boson model. The anomalous effect is
due to the temperature dependence of the bath spectral profile. The decoherence
reduction via the temperature increase can be relevant for the design of
quantum computers.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 20:58:10 GMT"
}
] | 2011-03-23T00:00:00 | [
[
"Montina",
"A.",
""
],
[
"Arecchi",
"F. T.",
""
]
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801.3845 | Lucio Mayer | Lucio Mayer (University of Zurich and ETH Zurich), Fabio Governato
(University of Washington), Tobias Kaufmann (UC Irvine) | The formation of disk galaxies in computer simulations | 41 pages, 15 figures, Invited Review accepted for publication on
Advanced Science Letters. High resolution version can be found at
http://www.exp-astro.phys.ethz.ch/mayer/galform.ps.gz | Adv.Sci.Lett.1:7-27,2008 | null | null | astro-ph | null | The formation of disk galaxies is one of the most outstanding problems in
modern astrophysics and cosmology. We review the progress made by numerical
simulations carried out on large parallel supercomputers. Recent progress stems
from a combination of increased resolution and improved treatment of the
astrophysical processes modeled in the simulations, such as the
phenomenological description of the interstellar medium and of the process of
star formation. High mass and spatial resolution is a necessary condition in
order to obtain large disks comparable with observed spiral galaxies avoiding
spurious dissipation of angular momentum. A realistic model of the star
formation history. gas-to-stars ratio and the morphology of the stellar and
gaseous component is instead controlled by the phenomenological description of
the non-gravitational energy budget in the galaxy. We show that simulations of
gas collapse within cold dark matter halos including a phenomenological
description of supernovae blast-waves allow to obtain stellar disks with nearly
exponential surface density profiles as those observed in real disk galaxies,
counteracting the tendency of gas collapsing in such halos to form cuspy
baryonic profiles. However, the ab-initio formation of a realistic rotationally
supported disk galaxy with a pure exponential disk in a fully cosmological
simulation is still an open problem. We argue that the suppression of bulge
formation is related to the physics of galaxy formation during the merger of
the most massive protogalactic lumps at high redshift, where the reionization
of the Universe likely plays a key role. A sufficiently high resolution during
this early phase of galaxy formation is also crucial to avoid artificial
angular momentum loss (Abridged).
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 20:01:32 GMT"
}
] | 2010-10-28T00:00:00 | [
[
"Mayer",
"Lucio",
"",
"University of Zurich and ETH Zurich"
],
[
"Governato",
"Fabio",
"",
"University of Washington"
],
[
"Kaufmann",
"Tobias",
"",
"UC Irvine"
]
] | [
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] |
801.3846 | Eric Saunders | Eric S. Saunders, Tim Naylor, Alasdair Allan | An Autonomous Adaptive Scheduling Agent for Period Searching | 5 pages, 2 figures, to appear in proceedings of Hot-wiring the
Transient Universe (HTU) 2007, Astronomische Nachrichten, March 2008 | null | 10.1002/asna.200710947 | null | astro-ph | null | We describe the design and implementation of an autonomous adaptive software
agent that addresses the practical problem of observing undersampled, periodic,
time-varying phenomena using a network of HTN-compliant robotic telescopes. The
algorithm governing the behaviour of the agent uses an optimal geometric
sampling technique to cover the period range of interest, but additionally
implements proactive behaviour that maximises the optimality of the dataset in
the face of an uncertain and changing operating environment.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 21:00:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Saunders",
"Eric S.",
""
],
[
"Naylor",
"Tim",
""
],
[
"Allan",
"Alasdair",
""
]
] | [
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] |
801.3847 | Ren\'ee Hlozek | Ren\'ee Hlozek, Marina Cort\^es, Chris Clarkson and Bruce Bassett | Non-parametric Dark Energy Degeneracies | 10 pages, 8 figures. Invited Review for special issue of General
Relativity and Gravitation issue on Dark Energy, eds. G. F.R Ellis et al | General Relativity and Gravitation, Volume 40, Issue 2-3, pp.
285-300 (2008) | 10.1007/s10714-007-0548-6 | null | astro-ph gr-qc | null | We study the degeneracies between dark energy dynamics, dark matter and
curvature using a non-parametric and non-perturbative approach. This allows us
to examine the knock-on bias induced in the reconstructed dark energy equation
of state, w(z), when there is a bias in the cosmic curvature or dark matter
content, without relying on any specific parameterisation of w. Even assuming
perfect Hubble, distance and volume measurements, we show that for z > 1, the
bias in w(z) is up to two orders of magnitude larger than the corresponding
errors in Omega_k or Omega_m. This highlights the importance of obtaining
unbiased estimators of all cosmic parameters in the hunt for dark energy
dynamics.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 21:01:39 GMT"
}
] | 2008-08-05T00:00:00 | [
[
"Hlozek",
"Renée",
""
],
[
"Cortês",
"Marina",
""
],
[
"Clarkson",
"Chris",
""
],
[
"Bassett",
"Bruce",
""
]
] | [
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] |
801.3848 | Giuseppe Lodato | G. Lodato (Department of Physics and Astronomy, University of
Leicester, UK) | Self-gravitating accretion discs | in press, La Rivista del Nuovo Cimento, 30, 293 (2007) | null | 10.1393/ncr/i2007-10022-x | null | astro-ph | null | I review recent progresses in the dynamics and the evolution of
self-gravitating accretion discs. Accretion discs are a fundamental component
of several astrophysical systems on very diverse scales, and can be found
around supermassive black holes in Active Galactic Nuclei (AGN), and also in
our Galaxy around stellar mass compact objects and around young stars.
Notwithstanding the specific differences arising from such diversity in
physical extent, all these systems share a common feature where a central
object is fed from the accretion disc, due to the effect of turbulence and disc
instabilities, which are able to remove the angular momentum from the gas and
allow its accretion. In recent years, it has become increasingly apparent that
the gravitational field produced by the disc itself (the disc's self-gravity)
is an important ingredient in the models, especially in the context of
protostellar discs and of AGN discs. Indeed, it appears that in many cases (and
especially in the colder outer parts of the disc) the development of
gravitational instabilities can be one of the main agents in the redistribution
of angular momentum. In some cases, the instability can be strong enough to
lead to the formation of gravitationally bound clumps within the disc, and thus
to determine the disc fragmentation. As a result, progress in our understanding
of the dynamics of self-gravitating discs is essential to understand the
processes that lead to the feeding of both young stars and of supermassive
black holes in AGN. At the same time, understanding the fragmentation
conditions is important to determine under which conditions AGN discs would
fragment and form stars and whether protostellar discs might form giant gaseous
planets through disc fragmentation.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 00:20:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lodato",
"G.",
"",
"Department of Physics and Astronomy, University of\n Leicester, UK"
]
] | [
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] |
801.3849 | Ezequiel Treister | Ezequiel Treister (ESO-CHILE), Julian H. Krolik (JHU) and Cornelis
Dullemond (MPIA) | Measuring the Fraction of Obscured Quasars by the Infrared Luminosity of
Unobscured Quasars | ApJ, in press. 10 pages in emulateapj style, 4 figures, 3 tables | null | 10.1086/586698 | null | astro-ph | null | Recent work has suggested that the fraction of obscured AGN declines with
increasing luminosity, but it has been difficult to quantify this trend. Here,
we attempt to measure this fraction as a function of luminosity by studying the
ratio of mid-infrared to intrinsic nuclear bolometric luminosity in unobscured
AGN. Because the mid-infrared is created by dust reprocessing of shorter
wavelength nuclear light, this ratio is a diagnostic of f_obsc, the fraction of
solid angle around the nucleus covered by obscuring matter. In order to
eliminate possible redshift-dependences while also achieving a large dynamic
range in luminosity, we have collected archival 24 micron MIPS photometry from
objects with z~1 in the Sloan Digital Sky Survey (SDSS), the Great
Observatories Origins Deep Survey (GOODS) and the Cosmic Evolution Survey
(COSMOS). To measure the bolometric luminosity for each object, we used
archival optical data supplemented by GALEX data. We find that the mean ratio
of 24 microns to bolometric luminosity decreases by a factor of ~3 in the
L_bol=10^44-3x10^47 ergs s^-1 range, but there is also a large scatter at
constant L_bol. Using radiation transfer solutions for model geometries, we
show how the IR/bolometric ratio relates to f_obsc and compare these values
with those obtained obtained from samples of X-ray selected AGN. Although we
find approximate agreement, our method indicates somewhat higher values of
f_obsc, particularly in the middle range of luminosities, suggesting that there
may be a significant number of heavily obscured AGN missed by X-ray surveys.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 21:03:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Treister",
"Ezequiel",
"",
"ESO-CHILE"
],
[
"Krolik",
"Julian H.",
"",
"JHU"
],
[
"Dullemond",
"Cornelis",
"",
"MPIA"
]
] | [
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801.385 | Isabel M. C. Salavessa | Guanghan Li and Isabel M.C. Salavessa | Graphic Bernstein Results in Curved Pseudo-Riemannian Manifolds | Accepted for publication in the Journal of Geometry and Physics.
Final version: Some simplifications, improvements and reorganization. In
version 3, we replace the condition $K_1\geq 0$ by the weaker condition
$Ricci_1\geq 0$. The proofs are essentially the same | Journal of Geometry and Physics, Volume 59, Issue 9, 2009,
1306-1313 | 10.1016/j.geomphys.2009.06.011 | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize a Bernstein-type result due to Albujer and Al\'ias, for maximal
surfaces in a curved Lorentzian product 3-manifold of the form $\Sigma_1\times
\mathbb{R}$, to higher dimension and codimension. We consider $M$ a complete
spacelike graphic submanifold with parallel mean curvature, defined by a map
$f: \Sigma_1\to \Sigma_2$ between two Riemannian manifolds $(\Sigma_1^m, g_1)$
and $(\Sigma^n_2, g_2)$ of sectional curvatures $K_1$ and $K_2$, respectively.
We take on $\Sigma_1\times \Sigma_2$ the pseudo-Riemannian product metric
$g_1-g_2$. Under the curvature conditions, $\mathrm{Ricci}_1 \geq 0$ and
$K_1\geq K_2$, we prove that, if the second fundamental form of $M$ satisfies
an integrability condition, then $M$ is totally geodesic, and it is a slice if
$\mathrm{Ricci}_1(p)>0$ at some point. For bounded $K_1$, $K_2$ and hyperbolic
angle $\theta$, we conclude $M$ must be maximal. If $M$ is a maximal surface
and $K_1\geq K_2^+$, we show $M$ is totally geodesic with no need for further
assumptions. Furthermore, $M$ is a slice if at some point $p\in \Sigma_1$,
$K_1(p)> 0$, and if $\Sigma_1$ is flat and $K_2<0$ at some point $f(p)$, then
the image of $f$ lies on a geodesic of $\Sigma_2$.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 22:02:19 GMT"
},
{
"version": "v2",
"created": "Sat, 22 Mar 2008 07:55:58 GMT"
},
{
"version": "v3",
"created": "Thu, 31 Jul 2008 12:26:17 GMT"
},
{
"version": "v4",
"created": "Sat, 18 Oct 2008 08:30:58 GMT"
},
{
"version": "v5",
"created": "Fri, 19 Jun 2009 17:17:48 GMT"
}
] | 2009-08-03T00:00:00 | [
[
"Li",
"Guanghan",
""
],
[
"Salavessa",
"Isabel M. C.",
""
]
] | [
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801.3851 | Zhong Chao Wu | Zhong Chao Wu | Commutativity of Substitution and Variation in Actions of Quantum Field
Theory | 11 pages | Phys.Rev.D80:105001,2009 | 10.1103/PhysRevD.80.105001 | ZJUT-08-01 | hep-th gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There exists a paradox in quantum field theory: substituting a field
configuration which solves a subset of the field equations into the action and
varying it is not necessarily equivalent to substituting that configuration
into the remaining field equations. We take the $S^4$ and Freund-Rubin-like
instantons as two examples to clarify the paradox. One must match the
specialized configuration field variables with the corresponding boundary
conditions by adding appropriate Legendre terms to the action. Some comments
are made regarding exceptional degenerate cases.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 20:09:17 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Jan 2008 19:24:40 GMT"
},
{
"version": "v3",
"created": "Wed, 11 Nov 2009 21:56:40 GMT"
}
] | 2009-11-11T00:00:00 | [
[
"Wu",
"Zhong Chao",
""
]
] | [
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] |
801.3852 | Krainer Thomas | Thomas Krainer | On the expansion of the resolvent for elliptic boundary contact problems | null | null | null | null | math.SP math.AP | null | Let $A$ be an elliptic operator on a compact manifold with boundary $M$, and
let $\wp : \partial\M \to Y$ be a covering map, where $Y$ is a closed manifold.
Let $A_C$ be a realization of $A$ subject to a coupling condition $C$ that is
elliptic with parameter in the sector $\Lambda$. By a coupling condition we
mean a nonlocal boundary condition that respects the covering structure of the
boundary.
We prove that the resolvent trace $\Tr_{L^2} (A_C-\lambda)^{-N}$ for $N$
sufficiently large has a complete asymptotic expansion as $|\lambda| \to
\infty$, $\lambda \in \Lambda$. In particular, the heat trace
$\Tr_{L^2}e^{-tA_C}$ has a complete asymptotic expansion as $t \to 0^+$, and
the $\zeta$-function has a meromorphic extension to $\C$.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 21:39:44 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Krainer",
"Thomas",
""
]
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] |
801.3853 | Grenville Croll | Simon Murphy | Comparison of Spreadsheets with other Development Tools (limitations,
solutions, workarounds and alternatives) | 9 pages including references, colour diagrams and comparison tables | Proc. European Spreadsheet Risks Int. Grp. 2005 201208
ISBN:1-902724-16-X | null | null | cs.SE cs.CY | null | The spreadsheet paradigm has some unique risks and challenges that are not
present in more traditional development technologies. Many of the recent
advances in other branches of software development have bypassed spreadsheets
and spreadsheet developers. This paper compares spreadsheets and spreadsheet
development to more traditional platforms such as databases and procedural
languages. It also considers the fundamental danger introduced in the
transition from paper spreadsheets to electronic. Suggestions are made to
manage the risks and work around the limitations.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 21:40:17 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Murphy",
"Simon",
""
]
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] |
801.3854 | Jean-S\'ebastien Sereni | D. Kr\'al', O. Pangr\'ac, J.-S. Sereni and R. Skrekovski | Long cycles in fullerene graphs | 12 pages, 10 figures | Journal of Mathematical Chemistry, 45(4):1021--1031, 2009 | 10.1007/s10910-008-9390-7 | ITI Series 2008-372 | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is conjectured that every fullerene graph is hamiltonian. Jendrol' and
Owens proved [J. Math. Chem. 18 (1995), pp. 83--90] that every fullerene graph
on n vertices has a cycle of length at least 4n/5. In this paper, we improve
this bound to 5n/6-2/3.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 23:01:38 GMT"
},
{
"version": "v2",
"created": "Thu, 1 Jul 2010 12:36:34 GMT"
},
{
"version": "v3",
"created": "Mon, 24 Jan 2011 13:11:41 GMT"
}
] | 2011-01-25T00:00:00 | [
[
"Král'",
"D.",
""
],
[
"Pangrác",
"O.",
""
],
[
"Sereni",
"J. -S.",
""
],
[
"Skrekovski",
"R.",
""
]
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] |
801.3855 | Tommaso Pardini | T. Pardini and R. R. P. Singh | Magnetic order in coupled spin-half and spin-one Heisenberg chains in
anisotropic triangular-lattice geometry | 7 pages, 8 figures | Phys. Rev. B 77, 214433 (2008) | 10.1103/PhysRevB.77.214433 | null | cond-mat.str-el | null | We study spin-half and spin-one Heisenberg models in the limit where one
dimensional (1-D) linear chains, with exchange constant J1, are weakly coupled
in an anisotropic triangular lattice geometry. Results are obtained by means of
linked-cluster series expansions at zero temperature around different
magnetically ordered phases. We study the non-colinear spiral phases that arise
classically in the model and the colinear antiferromagnet that has been
recently proposed for the spin-half model by Starykh and Balents using a
Renormalization Group approach. We find that such phases can be stabilized in
the spin-half model for arbitrarily small coupling between the chains. For
vanishing coupling between the chains the energy of each phase must approach
that of decoupled linear chains. With increasing inter-chain coupling, the
non-colinear phase appears to have a lower energy in our calculations. For the
spin-one chain, we find that there is a critical interchain coupling needed to
overcome the Haldane gap. When spin-one chains are coupled in an unfrustrated
manner, the critical coupling is very small (~0.01J1) and agrees well with
previous chain mean-field studies. When they are coupled in the frustrated
triangular-lattice geometry, the critical coupling required to develop magnetic
order is substantially larger (> 0.3J1). The colinear phase is not obtained for
the spin-one Heisenberg model.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 01:24:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pardini",
"T.",
""
],
[
"Singh",
"R. R. P.",
""
]
] | [
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801.3856 | John R. Thorstensen | S. Brady (AAVSO), J. R. Thorstensen (Dartmouth), M. D. Koppelman (U.
Minnesota), J. L. Prieto (Ohio State U.), P. M. Garnavich, A. Hirschauer, M.
Florack (Notre Dame) | The Eclipsing Cataclysmic Variable Lanning 386: Dwarf Nova, SW Sextantis
Star, or Both? | Tex with 10 postscript figures. Dedicated to the late Howard Lanning | null | 10.1086/529209 | null | astro-ph | null | We present photometry and spectroscopy of the suspected cataclysmic variable
(CV) Lanning 386. We confirm that it is a CV, and observe deep eclipses, from
which we determine the orbital period Porb to be 0.1640517 +- 0.0000001 d (=
3.94 h). Photometric monitoring over two observing seasons shows a very active
system with frequent outbursts of variable amplitude, up to approx. 2 mag. The
spectrum in quiescence is typical of dwarf novae, but in its high state the
system shows strong HeII emission and a broad CIV Wolf-Rayet feature. This is
unusual for dwarf novae in outburst and indicates a high excitation. In its
high state the system shows some features reminiscent of an SW Sextantis-type
CV, but lacks others. We discuss the classification of this puzzling object.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 23:19:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brady",
"S.",
"",
"AAVSO"
],
[
"Thorstensen",
"J. R.",
"",
"Dartmouth"
],
[
"Koppelman",
"M. D.",
"",
"U.\n Minnesota"
],
[
"Prieto",
"J. L.",
"",
"Ohio State U."
],
[
"Garnavich",
"P. M.",
"",
"Notre Dame"
],
[
"Hirschauer",
"A.",
"",
"Notre Dame"
],
[
"Florack",
"M.",
"",
"Notre Dame"
]
] | [
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0.0151540227,
0.0793755278,
-0.0802205503,
0.0398849361,
0.0167877283,
-0.113852337,
0.0012226381,
0.0568980016,
0.0323642604,
0.0657988787,
-0.0189566109,
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] |
801.3857 | Paola Testa | P. Testa (MIT), J.J. Drake (SAO), B. Ercolano (SAO), F. Reale
(Universita' di Palermo, and INAF), D.P. Huenemoerder (MIT), L. Affer
(Universita' di Palermo, and INAF), G. Micela (INAF), D. Garcia-Alvarez (SAO,
and Imperial College London) | Geometry Diagnostics of a Stellar Flare from Fluorescent X-rays | accepted for publication on the Astrophysical Journal Letters | null | 10.1086/533461 | null | astro-ph | null | We present evidence of Fe fluorescent emission in the Chandra HETGS spectrum
of the single G-type giant HR 9024 during a large flare. In analogy to solar
X-ray observations, we interpret the observed Fe K$\alpha$ line as being
produced by illumination of the photosphere by ionizing coronal X-rays, in
which case, for a given Fe photospheric abundance, its intensity depends on the
height of the X-ray source. The HETGS observations, together with 3D Monte
Carlo calculations to model the fluorescence emission, are used to obtain a
direct geometric constraint on the scale height of the flaring coronal plasma.
We compute the Fe fluorescent emission induced by the emission of a single
flaring coronal loop which well reproduces the observed X-ray temporal and
spectral properties according to a detailed hydrodynamic modeling. The
predicted Fe fluorescent emission is in good agreement with the observed value
within observational uncertainties, pointing to a scale height $\lesssim
0.3$\rstar. Comparison of the HR 9024 flare with that recently observed on II
Peg by Swift indicates the latter is consistent with excitation by X-ray
photoionization.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 23:09:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Testa",
"P.",
"",
"MIT"
],
[
"Drake",
"J. J.",
"",
"SAO"
],
[
"Ercolano",
"B.",
"",
"SAO"
],
[
"Reale",
"F.",
"",
"Universita' di Palermo, and INAF"
],
[
"Huenemoerder",
"D. P.",
"",
"MIT"
],
[
"Affer",
"L.",
"",
"Universita' di Palermo, and INAF"
],
[
"Micela",
"G.",
"",
"INAF"
],
[
"Garcia-Alvarez",
"D.",
"",
"SAO,\n and Imperial College London"
]
] | [
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] |
801.3858 | Huaxin Lin | Huaxin Lin | The Range of Approximate Unitary Equivalence Classes of Homomorphisms
from AH-algebras | null | null | null | null | math.OA math.KT | null | Let $C$ be a unital AH-algebra and $A$ be a unital simple C*-algebra with
tracial rank zero. It has been shown that two unital monomorphisms $\phi, \psi:
C\to A$ are approximately unitarily equivalent if and only if $$ [\phi]=[\psi]
{\rm in} KL(C,A) and \tau\circ \phi=\tau\circ \psi \tforal \tau\in T(A), $$
where $T(A)$ is the tracial state space of $A.$ In this paper we prove the
following: Given $\kappa\in KL(C,A)$ with $\kappa(K_0(C)_+\setminus
\{0\})\subset K_0(A)_+\setminus \{0\}$ and with $\kappa([1_C])=[1_A]$ and a
continuous affine map $\lambda: T(A)\to T_{\mathtt{f}}(C)$ which is compatible
with $\kappa,$ where $T_{\mathtt{f}}(C)$ is the convex set of all faithful
tracial states, there exists a unital monomorphism $\phi: C\to A$ such that $$
[\phi]=\kappa\andeqn \tau\circ \phi(c)=\lambda(\tau)(c) $$ for all $c\in
C_{s.a.}$ and $\tau\in T(A).$ Denote by ${\rm Mon}_{au}^e(C,A)$ the set of
approximate unitary equivalence classes of unital monomorphisms. We provide a
bijective map $$ \Lambda: {\rm Mon}_{au}^e (C,A)\to KLT(C,A)^{++}, $$ where
$KLT(C,A)^{++}$ is the set of compatible pairs of elements in $KL(C,A)^{++}$
and continuous affine maps from $T(A)$ to $T_{\mathtt{f}}(C).$ Moreover, we
realized that there are compact metric spaces $X$, unital simple AF-algebras
$A$ and $\kappa\in KL(C(X), A)$ with $\kappa(K_0(C(X))_+\setminus\{0\})\subset
K_0(A)_+\setminus \{0\}$ for which there is no \hm $h: C(X)\to A$ so that
$[h]=\kappa.$
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 20:59:52 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Lin",
"Huaxin",
""
]
] | [
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0.0939284638,
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] |
801.3859 | David Hobill | Jop Briet and David Hobill | Determining the Dimensionality of Spacetime by Gravitational Lensing | 9 pages, 3 figures, processed using revtex4 | null | null | null | gr-qc | null | The physics associated with spherically symmetric charged black holes is
analyzed from the point of view of using weak gravitational lensing as a means
for determining the dimensionality of spacetime. In particular, for exact
solutions of electro-vac black holes in four and five spacetime dimensions the
motion of photons is studied using the equations for the null geodesics and
deriving the weak limit bending angles and delays in photon arrival times.
| [
{
"version": "v1",
"created": "Thu, 24 Jan 2008 23:32:45 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Briet",
"Jop",
""
],
[
"Hobill",
"David",
""
]
] | [
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] |
801.386 | Ben Buchler | G. H\'etet, J. J. Longdell, M. J. Sellars, P. K. Lam, and B. C.
Buchler | Multi-Modal Properties and Dynamics of the Gradient Echo Quantum Memory | 4 pages 3 figures | Phys. Rev. Lett. 101, 203601 (2008) | 10.1103/PhysRevLett.101.203601 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of a recently proposed Gradient Echo Memory
(GEM) scheme for information mapping between optical and atomic systems. We
show that GEM can be described by the dynamic formation of polaritons in
k-space. This picture highlights the flexibility and robustness with regards to
the external control of the storage process. Our results also show that, as GEM
is a frequency-encoding memory, it can accurately preserve the shape of signals
that have large time-bandwidth products, even at moderate optical depths. At
higher optical depths, we show that GEM is a high fidelity multi-mode quantum
memory.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 05:40:42 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Sep 2008 08:43:50 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Nov 2008 04:21:49 GMT"
}
] | 2008-11-14T00:00:00 | [
[
"Hétet",
"G.",
""
],
[
"Longdell",
"J. J.",
""
],
[
"Sellars",
"M. J.",
""
],
[
"Lam",
"P. K.",
""
],
[
"Buchler",
"B. C.",
""
]
] | [
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] |
801.3861 | Wei-Zhou Jiang | Wei-Zhou Jiang, Bao-An Li | Effects of medium-induced $\rho-\omega$ meson mixing on the equation of
state in isospin-asymmetric nuclear matter | Significant changes made. Accepted version to appear in PRC (2009) | null | 10.1103/PhysRevC.80.044322 | null | nucl-th nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine effects of the $\rho-\omega$ meson mixing mediated by nucleon
polarizations on the symmetry energy in isospin-asymmetric nuclear matter.
Taking into account the rearrangement term neglected in previous studies by
others, we evaluate the $\rho-\omega$ mixing angle in a novel way within the
Relativistic Mean-Field Models with and without chiral limits. It is found that
the symmetry energy is significantly softened at high densities contrary to the
finding in earlier studies. As the first step of going beyond the lowest-order
calculations, we also solve the RPA equation for the $\rho-\omega$ mixing. In
this case, it is found that the symmetry energy is not only significantly
softened by the $\rho-\omega$ mixing at supra-saturation densities, similar to
the lowest-order $\rho-\omega$ mixing, but interestingly also softened at
subsaturation densities. In addition, the softening of the symmetry energy at
subsaturation densities can be partly suppressed by the nonlinear
self-interaction of the $\sigma$ meson.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 00:11:46 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Sep 2009 08:28:52 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Jiang",
"Wei-Zhou",
""
],
[
"Li",
"Bao-An",
""
]
] | [
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] |
801.3862 | Shuyun Zhou | S.Y. Zhou, D.A. Siegel, A.V. Fedorov, and A. Lanzara | Departure from the conical dispersion in epitaxial graphene | 5 pages, 5 figures | Physica E 40, 2642-2647 (2008) | 10.1016/j.physe.2007.10.121 | null | cond-mat.mtrl-sci cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pi bands of epitaxially grown graphene are studied by using high
resolution angle resolved photoemission spectroscopy. Clear deviations from the
conical dispersion expected for massless Dirac fermions and an anomalous
increase of the scattering rate are observed in the vicinity of the Dirac point
energy. Possible explanations for such anomalies are discussed in terms of
many-body interactions and the opening of a gap. We present detailed
experimental evidences in support of the gap scenario. This finding reveals a
fundamental intrinsic property of epitaxial graphene and demonstrates the
possibility of engineering the band gap in epitaxial graphene.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 00:22:23 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jul 2008 07:03:13 GMT"
}
] | 2008-07-30T00:00:00 | [
[
"Zhou",
"S. Y.",
""
],
[
"Siegel",
"D. A.",
""
],
[
"Fedorov",
"A. V.",
""
],
[
"Lanzara",
"A.",
""
]
] | [
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] |
801.3863 | Ignacio Negueruela | Ignacio Negueruela (Alicante), Jose Miguel Torrejon (Alicante & MIT),
Pablo Reig (Crete), Marc Ribo (Barcelona), David M. Smith (UCSC) | Supergiant Fast X-ray Transients and Other Wind Accretors | 5 pages, 3 figures proceedings of "A population explosion: the nature
and evolution of X-ray binaries in diverse environments", conference held in
St.Petersburg Beach, Florida (USA) 28 Oct - 2 Nov 2007; R. M. Bandyopadhyay
et al. (eds.) | AIP Conf.Proc.1010:252-256,2008 | 10.1063/1.2945052 | null | astro-ph | null | Supergiant Fast X-ray Transients are obviously related to persistent
Supergiant X-ray Binaries. Any convincing explanation for their behaviour must
consistently take into account all types of X-ray sources powered by wind
accretion. Here we present a common framework for wind accreting sources,
within the context of clumpy wind models, that allows a coherent interpretation
of their different behaviours as an immediate consequence of diverse orbital
geometries.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 00:36:14 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Negueruela",
"Ignacio",
"",
"Alicante"
],
[
"Torrejon",
"Jose Miguel",
"",
"Alicante & MIT"
],
[
"Reig",
"Pablo",
"",
"Crete"
],
[
"Ribo",
"Marc",
"",
"Barcelona"
],
[
"Smith",
"David M.",
"",
"UCSC"
]
] | [
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] |
801.3864 | Alberto Pepe Mr | Alberto Pepe and Johan Bollen | Between conjecture and memento: shaping a collective emotional
perception of the future | 6 pages. AAAI Spring Symposium on Emotion, Personality, and Social
Behavior | null | null | null | cs.CL cs.GL | null | Large scale surveys of public mood are costly and often impractical to
perform. However, the web is awash with material indicative of public mood such
as blogs, emails, and web queries. Inexpensive content analysis on such
extensive corpora can be used to assess public mood fluctuations. The work
presented here is concerned with the analysis of the public mood towards the
future. Using an extension of the Profile of Mood States questionnaire, we have
extracted mood indicators from 10,741 emails submitted in 2006 to futureme.org,
a web service that allows its users to send themselves emails to be delivered
at a later date. Our results indicate long-term optimism toward the future, but
medium-term apprehension and confusion.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 01:09:47 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Pepe",
"Alberto",
""
],
[
"Bollen",
"Johan",
""
]
] | [
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] |
801.3865 | Danny Fan | Nassif Ghoussoub and Amir Moradifam | Simultaneous preconditioning and symmetrization of non-symmetric linear
systems | 14 pages. Updated versions --if any-- of this author's papers can be
downloaded at http://www.birs.ca/~nassif | null | null | null | math.NA | null | Motivated by the theory of self-duality which provides a variational
formulation and resolution for non self-adjoint partial differential equations
\cite{G1, G2}, we propose new templates for solving large non-symmetric linear
systems. The method consists of combining a new scheme that simultaneously
preconditions and symmetrizes the problem, with various well known iterative
methods for solving linear and symmetric problems. The approach seems to be
efficient when dealing with certain ill-conditioned, and highly non-symmetric
systems.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 01:24:04 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Ghoussoub",
"Nassif",
""
],
[
"Moradifam",
"Amir",
""
]
] | [
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] |
801.3866 | Joseph A. Wolf | Joseph A. Wolf | Infinite Dimensional Multiplicity Free Spaces II: Limits of Commutative
Nilmanifolds | 31 pages | null | null | null | math.RT math.DG | null | We study direct limits $(G,K) = \varinjlim (G_n,K_n)$ of Gelfand pairs of the
form $G_n = N_n\rtimes K_n$ with $N_n$ nilpotent, in other words pairs
$(G_n,K_n)$ for which $G_n/K_n$ is a commutative nilmanifold. First, we extend
the criterion of \cite{W3} for a direct limit representation to be multiplicity
free. Then we study direct limits $G/K = \varinjlim G_n/K_n$ of commutative
nilmanifolds and look to see when the regular representation of $G = \varinjlim
G_n$ on an appropriate Hilbert space $\varinjlim L^2(G_n/K_n)$ is multiplicity
free. One knows that the $N_n$ are commutative or 2--step nilpotent. In many
cases where the derived algebras $[\gn_n,\gn_n]$ are of bounded dimension we
construct $G_n$--equivariant isometric maps $\zeta_n : L^2(G_n/K_n) \to
L^2(G_{n+1}/K_{n+1})$ and prove that the left regular representation of $G$ on
the Hilbert space $L^2(G/K) := \varinjlim \{L^2(G_n/K_n),\zeta_n\}$ is a
multiplicity free direct integral of irreducible unitary representations. The
direct integral and its irreducible constituents are described explicitly. One
constituent of our argument is an extension of the classical Peter--Weyl
Theorem to parabolic direct limits of compact groups.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 01:39:53 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Wolf",
"Joseph A.",
""
]
] | [
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] |
801.3867 | Stephen Godfrey | Stephen Godfrey (Carleton) and Stephen L. Olsen (Hawaii & IHEP
Beijing) | The Exotic XYZ Charmonium-like Mesons | 28 pages, 7 figures. Review for Ann Rev Nucl & Part Sci | Ann.Rev.Nucl.Part.Sci.58:51-73,2008 | 10.1146/annurev.nucl.58.110707.171145 | null | hep-ph hep-ex | null | Charmonium, the spectroscopy of c\bar{c} mesons, has recently enjoyed a
renaissance with the discovery of several missing states and a number of
unexpected charmonium-like resonances. The discovery of these new states has
been made possible by the extremely large data samples made available by the
B-factories at the Stanford Linear Accelerator Center and at KEK in Japan, and
at the CESR e^+e^- collider at Cornell. Conventional c\bar{c} states are well
described by quark potential models. However, many of these newly discovered
charmonium-like mesons do not seem to fit into the conventional c\bar{c}
spectrum. There is growing evidence that at least some of these new states are
exotic, i.e. new forms of hadronic matter such as mesonic-molecules,
tetraquarks, and/or hybrid mesons. In this review we describe expectations for
the properties of conventional charmonium states and the predictions for
molecules, tetraquarks and hybrids and the various processes that can be used
to produce them. We examine the evidence for the new candidate exotic mesons,
possible explanations, and experimental measurements that might shed further
light on the nature these states.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 01:45:56 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Godfrey",
"Stephen",
"",
"Carleton"
],
[
"Olsen",
"Stephen L.",
"",
"Hawaii & IHEP\n Beijing"
]
] | [
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] |
801.3868 | Hidekazu Mukuda | H. Mukuda, T. Fujii, T. Ohara, A. Harada, M. Yashima, Y. Kitaoka, Y.
Okuda, R. Settai, and Y. Onuki | Enhancement of Superconducting Transition Temperature due to the strong
Antiferromagnetic Spin Fluctuations in Non-centrosymmetric Heavy-fermion
Superconductor CeIrSi3 :A 29Si-NMR Study under Pressure | 4 pages, 5 figures, To be published in Phys. Rev. Lett | Phys. Rev. Lett., 100, 107003/1-4 (2008) | 10.1103/PhysRevLett.100.107003 | null | cond-mat.supr-con cond-mat.str-el | null | We report a 29Si-NMR study on the pressure-induced superconductivity (SC) in
an antiferromagnetic (AFM) heavy-fermion compound CeIrSi3 without inversion
symmetry. In the SC state at P=2.7-2.8 GPa, the temperature dependence of the
nuclear-spin lattice relaxation rate 1/T_1 below Tc exhibits a T^3 behavior
without any coherence peak just below Tc, revealing the presence of line nodes
in the SC gap. In the normal state, 1/T_1 follows a \sqrt{T}-like behavior,
suggesting that the SC emerges under the non-Fermi liquid state dominated by
AFM spin fluctuations enhanced around quantum critical point (QCP). The reason
why the maximum Tc in CeIrSi3 is relatively high among the Ce-based
heavy-fermion superconductors may be the existence of the strong AFM spin
fluctuations. We discuss the comparison with the other Ce-based heavy-fermion
superconductors.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 01:47:47 GMT"
}
] | 2012-03-22T00:00:00 | [
[
"Mukuda",
"H.",
""
],
[
"Fujii",
"T.",
""
],
[
"Ohara",
"T.",
""
],
[
"Harada",
"A.",
""
],
[
"Yashima",
"M.",
""
],
[
"Kitaoka",
"Y.",
""
],
[
"Okuda",
"Y.",
""
],
[
"Settai",
"R.",
""
],
[
"Onuki",
"Y.",
""
]
] | [
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] |
801.3869 | Joseph A. Wolf | Joseph A. Wolf | Infinite Dimensional Multiplicity Free Spaces I: Limits of Compact
Commutative Spaces | 23 pages | null | null | null | math.RT math.DG | null | We study direct limits $(G,K) = \varinjlim (G_n,K_n)$ of compact Gelfand
pairs. First, we develop a criterion for a direct limit representation to be a
multiplicity--free discrete direct sum of irreducible representations. Then we
look at direct limits $G/K = \varinjlim G_n/K_n$ of compact riemannian
symmetric spaces, where we combine our criterion with the Cartan--Helgason
Theorem to show in general that the regular representation of $G = \varinjlim
G_n$ on a certain function space $\varinjlim L^2(G_n/K_n)$ is multiplicity
free. That method is not applicable for direct limits of nonsymmetric Gelfand
pairs, so we introduce two other methods. The first, based on ``parabolic
direct limits'' and ``defining representations'', extends the method used in
the symmetric space case. The second uses some (new) branching rules from
finite dimensional representation theory. In both cases we define function
spaces $\cA(G/K)$, $\cC(G/K)$ and $L^2(G/K)$ to which our multiplicity--free
criterion applies.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 01:55:35 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Wolf",
"Joseph A.",
""
]
] | [
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] |
801.387 | Simon Ellis | S.C. Ellis (AAO) and J. Bland-Hawthorn (University of Sydney) | The case for OH suppression at near-infrared wavelengths | Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13021.x | null | astro-ph | null | We calculate the advances in near-infrared astronomy made possible through
the use of fibre Bragg gratings to selectively remove hydroxyl emission lines
from the night sky spectrum. Fibre Bragg gratings should remove OH lines at
high resolution (R=10,000), with high suppression (30dB) whilst maintaining
high throughput (~90 per cent) between the lines. Devices currently under
construction should remove 150 lines in each of the J and H bands, effectively
making the night sky surface brightness ~4 magnitudes fainter. This background
reduction is greater than the improvement adapative optics makes over natural
seeing; photonic OH suppression is at least as important as adaptive optics for
the future of cosmology.
We present a model of the NIR sky spectrum, and show that the interline
continuum is very faint (~80 ph/s/m^s/arcsec/micron on the ecliptic plane). We
show that OH suppression by high dispersion, i.e. `resolving out' the skylines,
cannot obtain the required level of sensitivity to reach the interline
continuum due to scattering of light. The OH lines must be suppressed prior to
dispersion.
We have simulated observations employing fibre Bragg gratings of first light
objects, high redshift galaxies and cool, low-mass stars. The simulations are
of complete end-to-end systems from object to detector. The results demonstrate
that fibre Bragg grating OH suppression will significantly advance our
knowledge in many areas of astrophysics, and in particular will enable
rest-frame ultra-violet observations of the Universe at the time of first light
and reionisation.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 02:09:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ellis",
"S. C.",
"",
"AAO"
],
[
"Bland-Hawthorn",
"J.",
"",
"University of Sydney"
]
] | [
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] |
801.3871 | Ke Xu | Chunyan Zhao, Ke Xu, Zhiming Zheng | On the Scaling Window of Model RB | null | null | null | null | cs.CC cond-mat.stat-mech cs.AI | null | This paper analyzes the scaling window of a random CSP model (i.e. model RB)
for which we can identify the threshold points exactly, denoted by $r_{cr}$ or
$p_{cr}$. For this model, we establish the scaling window
$W(n,\delta)=(r_{-}(n,\delta), r_{+}(n,\delta))$ such that the probability of a
random instance being satisfiable is greater than $1-\delta$ for
$r<r_{-}(n,\delta)$ and is less than $\delta$ for $r>r_{+}(n,\delta)$.
Specifically, we obtain the following result
$$W(n,\delta)=(r_{cr}-\Theta(\frac{1}{n^{1-\epsilon}\ln n}), \
r_{cr}+\Theta(\frac{1}{n\ln n})),$$ where $0\leq\epsilon<1$ is a constant. A
similar result with respect to the other parameter $p$ is also obtained. Since
the instances generated by model RB have been shown to be hard at the
threshold, this is the first attempt, as far as we know, to analyze the scaling
window of such a model with hard instances.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 02:18:00 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Zhao",
"Chunyan",
""
],
[
"Xu",
"Ke",
""
],
[
"Zheng",
"Zhiming",
""
]
] | [
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] |
801.3872 | Michael O'Hara | Michael J. O'Hara and Dianne P. O'Leary | The adiabatic theorem in the presence of noise | 40 pages, 4 figures | null | 10.1103/PhysRevA.77.042319 | null | quant-ph | null | We provide rigorous bounds for the error of the adiabatic approximation of
quantum mechanics under four sources of experimental error: perturbations in
the initial condition, systematic time-dependent perturbations in the
Hamiltonian, coupling to low-energy quantum systems, and decoherent
time-dependent perturbations in the Hamiltonian. For decoherent perturbations,
we find both upper and lower bounds on the evolution time to guarantee the
adiabatic approximation performs within a prescribed tolerance. Our new results
include explicit definitions of constants, and we apply them to the spin-1/2
particle in a rotating magnetic field, and to the superconducting flux qubit.
We compare the theoretical bounds on the superconducting flux qubit to
simulation results.
| [
{
"version": "v1",
"created": "Fri, 25 Jan 2008 02:46:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"O'Hara",
"Michael J.",
""
],
[
"O'Leary",
"Dianne P.",
""
]
] | [
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