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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0708.0549 | Florian Schwennsen | Agustin Sabio Vera (CERN), Florian Schwennsen (Hamburg U.) | Azimuthal decorrelation of forward jets in Deep Inelastic Scattering | 12 pages, 4 figures | Phys.Rev.D77:014001,2008 | 10.1103/PhysRevD.77.014001 | CERN-PH-TH/2007-130, DESY-07-113 | hep-ph | null | We study the azimuthal angle decorrelation of forward jets in Deep Inelastic
Scattering. We make predictions for this observable at HERA describing the high
energy limit of the relevant scattering amplitudes with quasi-multi-Regge
kinematics together with a collinearly improved evolution kernel for
multiparton emissions.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 16:49:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vera",
"Agustin Sabio",
"",
"CERN"
],
[
"Schwennsen",
"Florian",
"",
"Hamburg U."
]
] |
0708.0550 | Scott McIntosh | Scott W. McIntosh | On The Mass and Energy Loading of EUV Brightpoints | 29 pages, 11 color figures, Accepted to appear ApJ - Nov, 1 2007 | null | 10.1086/521948 | null | astro-ph | null | We discuss the appearance of EUV brightpoints (BPs) in the analysis of
long-duration observations in the He II 304 Angstrom passband of the Solar and
Heliospheric Observatory (SOHO) Extreme-ultraviolet Imaging Telescope (EIT).
The signature of the observed 304 Angstrom passband intensity fluctuations
around the BPs suggest that the primary source of the mass and energy supplied
to the magnetic structure is facilitated by relentless magnetoconvection-driven
reconnection, forced by the magnetic evolution of the surrounding
supergranules. Further, we observe that if the magnetic conditions in the
supergranules surrounding the footpoints of the cool 304 Angstrom BPs are
sufficient (large net imbalance with a magnetic field that closes beyond the
boundaries of the cell it originates in) the magnetic topology comprising the
BP will begin to reconnect with the overlying corona, increasing its visibility
to hotter EUV passbands and possibly Soft X-Rays.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 16:49:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"McIntosh",
"Scott W.",
""
]
] |
0708.0551 | David d'Enterria | David d'Enterria | Forward Physics at the LHC | Invited overview talk. 15th International Workshop on Deep-Inelastic
Scattering and Related Subjects (DIS2007), Munich, Germany, 16-20 Apr 2007.
[Typos corrections and other minor modifications.] | null | null | null | hep-ex nucl-ex | null | Small-angle detectors at the LHC give access to a broad physics programme
within and beyond the Standard Model (SM). We review the capabilities of ALICE,
ATLAS, CMS, LHCb, LHCf and TOTEM for forward physics studies in various
sectors: soft and hard diffractive processes, exclusive Higgs production, low-x
QCD, ultra-high-energy cosmic-rays, and electro-weak measurements.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 17:07:32 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 21:31:29 GMT"
},
{
"version": "v3",
"created": "Fri, 31 Aug 2007 00:06:05 GMT"
}
] | 2007-08-31T00:00:00 | [
[
"d'Enterria",
"David",
""
]
] |
0708.0552 | Mahmoud Abdel-Aty | A.-S. F. Obada and Mahmoud Abdel-Aty | Quantitative aspects of entanglement in the optically driven quantum
dots | 13 pages, 4 figures | Physical Review B, 75, pp. 195310-195316 (2007) | 10.1103/PhysRevB.75.195310 | null | quant-ph | null | We present a novel approach to look for the existence of maximum entanglement
in a system of two identical quantum dots coupled by the Forster process and
interacting with a classical laser field. Our approach is not only able to
explain the existing treatments, but also provides further detailed insights
into the coupled dynamics of quantum dots systems. The result demonstrates that
there are two ways for generating maximum entangled states, one associated with
far off-resonance interaction, and the other associated with the weak field
limit. Moreover, it is shown that exciton decoherence results in the decay of
entanglement.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 17:28:15 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 12:31:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Obada",
"A. -S. F.",
""
],
[
"Abdel-Aty",
"Mahmoud",
""
]
] |
0708.0553 | Florian Enescu | Florian Enescu and Melvin Hochster | The Frobenius Structure of Local Cohomology | 35 pages. Section 3 was revised to emphasize Theorem 3.1, and some
minor corrections/changes were performed. To appear in Algebra and Number
Theory | null | null | null | math.AC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a local ring of positive prime characteristic there is a natural
Frobenius action on its local cohomology modules with support at its maximal
ideal. In this paper we study the local rings for which the local cohomology
modules have only finitely many submodules invariant under the Frobenius
action. In particular we prove that F-pure Gorenstein local rings as well as
the face ring of a finite simplicial complex localized or completed at its
homogeneous maximal ideal have this property. We also introduce the notion of
an anti-nilpotent Frobenius action on an Artinian module over a local ring and
use it to study those rings for which the lattice of submodules of the local
cohomology that are invariant under Frobenius satisfies the Ascending Chain
Condition.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 17:32:59 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Sep 2008 20:45:07 GMT"
}
] | 2008-09-12T00:00:00 | [
[
"Enescu",
"Florian",
""
],
[
"Hochster",
"Melvin",
""
]
] |
0708.0554 | Wei-Cheng Lee | Wei-Cheng Lee, A.H. MacDonald | Hubbard-Thomas-Fermi Theory of Transition Metal Oxide Heterostructures | 2 pages, 1 figure, to appear in the proceedings of SCES'07, Houston,
TX, USA | null | 10.1016/j.physb.2007.10.191 | null | cond-mat.str-el cond-mat.mtrl-sci | null | We demonstrate that the charge distributions in Hubbard-model representations
of transition metal oxide heterojucntions can be described by a Thomas-Fermi
theory in which the energy is approximated as the sum of the electrostatic
energy and the uniform three-dimensional Hubbard model energy per site at the
local density equals to a constant. When charged atomic layers in the oxides
are approximated as two-dimensional sheets with uniform charge density, the
electrostatic energy is simply evaluated. We find that this Thomas-Fermi theory
can reproduce results obtained from full Hartree-Fock theory for various
different heterostructures. We also show explicitly how Thomas-Fermi theory can
be used to estimate some key properties qualitatively.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 17:36:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lee",
"Wei-Cheng",
""
],
[
"MacDonald",
"A. H.",
""
]
] |
0708.0555 | Shankar Bhamidi | David J. Aldous, Shankar Bhamidi | Edge Flows in the Complete Random-Lengths Network | 38 pages, 4 figures | null | null | null | math.PR | null | Consider the complete n-vertex graph whose edge-lengths are independent
exponentially distributed random variables. Simultaneously for each pair of
vertices, put a constant flow between them along the shortest path. Each edge
gets some random total flow. In the $n \to \infty$ limit we find explicitly the
empirical distribution of these edge-flows, suitably normalized.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 17:41:25 GMT"
}
] | 2007-08-06T00:00:00 | [
[
"Aldous",
"David J.",
""
],
[
"Bhamidi",
"Shankar",
""
]
] |
0708.0556 | Petr Vogel | Petr Vogel | Conversion of electron spectrum associated with fission into the
antineutrino spectrum | Accepted for publication in Phys. Rev. C | Phys.Rev.C76:025504,2007 | 10.1103/PhysRevC.76.025504 | null | hep-ph | null | The accuracy of the procedure that converts the experimentally determined
electron spectrum associated with fission of the nuclear fuels ^{235}U,
^{239}Pu, ^{241}Pu, and ^{238}U into the $\bar{\nu}_e$ spectrum is examined. By
using calculated sets of mutually consistent spectra it is shown that the
conversion procedure can result in a small $\sim$1% error provided several
conditions are met. Chief among them are the requirements that the average
nuclear charge <Z> as a function of the $\beta$ decay endpoint energy is
independently known and that the $\bar{\nu}_e$ spectrum is binned into bins
that are several times larger than the width of the slices used to fit the
electron spectrum.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 17:52:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vogel",
"Petr",
""
]
] |
0708.0557 | Carlo Di Franco | C. Di Franco, M. Paternostro, M. S. Kim | Nested entangled states for distributed quantum channels | 4 pages, 2 figures, RevTeX4 | Phys. Rev. A 77, 020303(R) (2008) | 10.1103/PhysRevA.77.020303 | null | quant-ph | null | We find a coupling-strength configuration for a linear chain of N spins which
gives rise to simultaneous multiple Bell states. We suggest a way such an
interesting entanglement pattern can be used in order to distribute maximally
entangled channels to remote locations and generate multipartite entanglement
with a minimum-control approach. Our proposal thus provides a way to achieve
the core resources in distributed information processing. The schemes we
describe can be efficiently tested in chains of coupled cavities interacting
with three-level atoms.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:14:02 GMT"
},
{
"version": "v2",
"created": "Sun, 2 Mar 2008 14:11:55 GMT"
}
] | 2008-03-02T00:00:00 | [
[
"Di Franco",
"C.",
""
],
[
"Paternostro",
"M.",
""
],
[
"Kim",
"M. S.",
""
]
] |
0708.0558 | D. J. Cecile | D. J. Cecile and Shailesh Chandrasekharan | Modeling pion physics in the $\epsilon$-regime of two-flavor QCD using
strong coupling lattice QED | 24 pages, 7 figures | Phys.Rev.D77:014506,2008 | 10.1103/PhysRevD.77.014506 | null | hep-lat | null | In order to model pions of two-flavor QCD we consider a lattice field theory
involving two flavors of staggered quarks interacting strongly with U(1) gauge
fields. For massless quarks, this theory has an $SU_L(2)\times SU_R(2) \times
U_A(1)$ symmetry. By adding a four-fermion term we can break the U_A(1)
symmetry and thus incorporate the physics of the QCD anomaly. We can also tune
the pion decay constant F, to be small compared to the lattice cutoff by
starting with an extra fictitious dimension, thus allowing us to model low
energy pion physics in a setting similar to lattice QCD from first principles.
However, unlike lattice QCD, a major advantage of our model is that we can
easily design efficient algorithms to compute a variety of quantities in the
chiral limit. Here we show that the model reproduces the predictions of chiral
perturbation theory in the $\epsilon$-regime.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:04:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cecile",
"D. J.",
""
],
[
"Chandrasekharan",
"Shailesh",
""
]
] |
0708.0559 | Eduardo Candelario-Jalil | E. Candelario-Jalil, D. Alvarez, N. Merino, O. S. Leon | Delayed treatment with nimesulide reduces measures of oxidative stress
following global ischemic brain injury in gerbils | null | Neuroscience Research 47(2): 245-253 (2003) | null | null | q-bio.TO | null | Metabolism of arachidonic acid by cyclooxygenase is one of the primary
sources of reactive oxygen species in the ischemic brain. Neuronal
overexpression of cyclooxygenase-2 has recently been shown to contribute to
neurodegeneration following ischemic injury. In the present study, we examined
the possibility that the neuroprotective effects of the cyclooxygenase-2
inhibitor nimesulide would depend upon reduction of oxidative stress following
cerebral ischemia. Gerbils were subjected to 5 min of transient global cerebral
ischemia followed by 48 h of reperfusion and markers of oxidative stress were
measured in hippocampus of gerbils receiving vehicle or nimesulide treatment at
three different clinically relevant doses (3, 6 or 12 mg/kg). Compared with
vehicle, nimesulide significantly (P<0.05) reduced hippocampal glutathione
depletion and lipid peroxidation, as assessed by the levels of malondialdehyde
(MDA), 4-hydroxy-alkenals (4-HDA) and lipid hydroperoxides levels, even when
the treatment was delayed until 6 h after ischemia. Biochemical evidences of
nimesulide neuroprotection were supported by histofluorescence findings using
the novel marker of neuronal degeneration Fluoro-Jade B. Few Fluoro-Jade B
positive cells were seen in CA1 region of hippocampus in ischemic animals
treated with nimesulide compared with vehicle. These results suggest that
nimesulide may protect neurons by attenuating oxidative stress and reperfusion
injury following the ischemic insult with a wide therapeutic window of
protection.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:23:38 GMT"
}
] | 2007-08-06T00:00:00 | [
[
"Candelario-Jalil",
"E.",
""
],
[
"Alvarez",
"D.",
""
],
[
"Merino",
"N.",
""
],
[
"Leon",
"O. S.",
""
]
] |
0708.0560 | Gideon Schechtman | William B. Johnson and Gideon Schechtman | Multiplication operators on L(L_p) and $\ell_p$-strictly singular
operators | null | null | null | null | math.FA | null | A classification of weakly compact multiplication operators on L(L_p),
$1<p<\infty$, is given. This answers a question raised by Saksman and Tylli in
1992. The classification involves the concept of $\ell_p$-strictly singular
operators, and we also investigate the structure of general $\ell_p$-strictly
singular operators on L_p. The main result is that if an operator T on L_p,
1<p<2, is $\ell_p$-strictly singular and T_{|X} is an isomorphism for some
subspace X of L_p, then X embeds into L_r for all r<2, but X need not be
isomorphic to a Hilbert space.
It is also shown that if T is convolution by a biased coin on L_p of the
Cantor group, $1\le p <2$, and $T_{|X}$ is an isomorphism for some reflexive
subspace X of L_p, then X is isomorphic to a Hilbert space. The case p=1
answers a question asked by Rosenthal in 1976.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:27:25 GMT"
}
] | 2007-08-06T00:00:00 | [
[
"Johnson",
"William B.",
""
],
[
"Schechtman",
"Gideon",
""
]
] |
0708.0561 | Alexander Vikman | Eugeny Babichev, Viatcheslav Mukhanov, Alexander Vikman | k-Essence, superluminal propagation, causality and emergent geometry | 34 pages, 5 figures | JHEP 0802:101,2008 | 10.1088/1126-6708/2008/02/101 | LMU-ASC 54/07 | hep-th astro-ph gr-qc | null | The k-essence theories admit in general the superluminal propagation of the
perturbations on classical backgrounds. We show that in spite of the
superluminal propagation the causal paradoxes do not arise in these theories
and in this respect they are not less safe than General Relativity.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:33:14 GMT"
}
] | 2011-02-25T00:00:00 | [
[
"Babichev",
"Eugeny",
""
],
[
"Mukhanov",
"Viatcheslav",
""
],
[
"Vikman",
"Alexander",
""
]
] |
0708.0562 | Woo-Sung Jung | Woo-Sung Jung, Okyu Kwon, Fengzhong Wang, Taisei Kaizoji, Hie-Tae
Moon, H. Eugene Stanley | Group dynamics of the Japanese market | 9 pages | Physica A 387(2-3), 537-542 (2008) | 10.1016/j.physa.2007.09.022 | null | q-fin.ST physics.soc-ph | null | We investigated the network structures of the Japanese stock market through
the minimum spanning tree. We defined grouping coefficient to test the validity
of conventional grouping by industrial categories, and found a decreasing in
trend for the coefficient. This phenomenon supports the increasing external
influences on the market due to the globalization. To reduce this influence, we
used S&P500 index as the international market and removed its correlation with
every stock. We found stronger grouping in this measurement, compared to the
original analysis, which agrees with our assumption that the international
market influences to the Japanese market.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:46:44 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Jung",
"Woo-Sung",
""
],
[
"Kwon",
"Okyu",
""
],
[
"Wang",
"Fengzhong",
""
],
[
"Kaizoji",
"Taisei",
""
],
[
"Moon",
"Hie-Tae",
""
],
[
"Stanley",
"H. Eugene",
""
]
] |
0708.0563 | Pawe{\l} Szab{\l}owski J. | Pawe{\l} J. Szab{\l}owski | Probabilistic implications of symmetries of q-Hermite and
Al-Salam-Chihara polynomials | 7 pages | Infin. Dimens. Anal. Quantum Probab. Relat. Top. Vol. 11, No. 4
(2008) 513-522 | null | null | math.PR math.CV | null | We prove the existence of stationary random fields with linear regressions
for $q>1$ and thus close an open question posed by W. Bryc et al.. We prove
this result by describing a discrete 1 dimensional conditional distribution and
then checking Chapman-Kolmogorov equation. Support of this distribution consist
of zeros of certain Al-Salam-Chihara polynomials. To find them we refer to and
expose known result concerning addition of $q-$ exponential function. This
leads to generalization of a well known formula $(x+y)^{n}%
=\sum_{i=0}^{n}\binom{n}{k}i^{k}H_{n-k}(x) H_{k}(-iy) ,$ where $H_{k}(x) $
denotes $k-$th Hermite polynomial.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:50:33 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 14:53:48 GMT"
}
] | 2012-08-13T00:00:00 | [
[
"Szabłowski",
"Paweł J.",
""
]
] |
0708.0564 | Eduardo Candelario-Jalil | E. Candelario-Jalil, D. Alvarez, A. Gonzalez-Falcon, M.
Garcia-Cabrera, G. Martinez-Sanchez, N. Merino, A. Giuliani, O. S. Leon | Neuroprotective efficacy of nimesulide against hippocampal neuronal
damage following transient forebrain ischemia | null | European Journal of Pharmacology 453(2-3): 189-195 (2002) | null | null | q-bio.TO | null | Cyclooxygenase-2 is involved in the inflammatory component of the ischemic
cascade, playing an important role in the delayed progression of the brain
damage. The present study evaluated the pharmacological effects of the
selective cyclooxygenase-2 inhibitor nimesulide on delayed neuronal death of
hippocampal CA1 neurons following transient global cerebral ischemia in
gerbils. Administration of therapeutically relevant doses of nimesulide (3, 6
and 12 mg/kg; i.p.) 30 min before ischemia and at 6, 12, 24, 48 and 72 h after
ischemia significantly (P<0.01) reduced hippocampal neuronal damage. Treatment
with a single dose of nimesulide given 30 min before ischemia also resulted in
a significant increase in the number of healthy neurons in the hippocampal CA1
sector 7 days after ischemia. Of interest is the finding that nimesulide
rescued CA1 pyramidal neurons from ischemic death even when treatment was
delayed until 24 h after ischemia (34+/-9% protection). Neuroprotective effect
of nimesulide is still evident 30 days after the ischemic episode, providing
the first experimental evidence that cyclooxygenase-2 inhibitors confer a
long-lasting neuroprotection. Oral administration of nimesulide was also able
to significantly reduce brain damage, suggesting that protective effects are
independent of the route of administration. The present study confirms the
ability of cyclooxygenase-2 inhibitors to reduce brain damage induced by
cerebral ischemia and indicates that nimesulide can provide protection when
administered for up to 24 h post-ischemia.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:51:15 GMT"
}
] | 2007-08-06T00:00:00 | [
[
"Candelario-Jalil",
"E.",
""
],
[
"Alvarez",
"D.",
""
],
[
"Gonzalez-Falcon",
"A.",
""
],
[
"Garcia-Cabrera",
"M.",
""
],
[
"Martinez-Sanchez",
"G.",
""
],
[
"Merino",
"N.",
""
],
[
"Giuliani",
"A.",
""
],
[
"Leon",
"O. S.",
""
]
] |
0708.0565 | Hao Xu | Kefeng Liu, Hao Xu | Recursion formulae of higher Weil-Petersson volumes | 18 pages, to appear in IMRN | Int. Math. Res. Notices (2009) 2009 (5): 835-859 | 10.1093/imrn/rnn148 | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study effective recursion formulae for computing
intersection numbers of mixed $\psi$ and $\kappa$ classes on moduli spaces of
curves. By using the celebrated Witten-Kontsevich theorem, we generalize
Mulase-Safnuk form of Mirzakhani's recursion and prove a recursion formula of
higher Weil-Petersson volumes. We also present recursion formulae to compute
intersection pairings in the tautological rings of moduli spaces of curves.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:52:00 GMT"
},
{
"version": "v2",
"created": "Fri, 22 May 2009 01:38:26 GMT"
}
] | 2013-03-28T00:00:00 | [
[
"Liu",
"Kefeng",
""
],
[
"Xu",
"Hao",
""
]
] |
0708.0566 | Colin Benjamin | R. M\'elin, C. Benjamin, T. Martin | Positive noise cross-correlations in superconducting hybrids: Roles of
interfaces and interactions | 15 pages, 9 figures | Phys. Rev. B 77, 094512 (2008) | 10.1103/PhysRevB.77.094512 | null | cond-mat.mes-hall cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Shot noise cross-correlations in normal metal-superconductor-normal metal
structures are discussed at arbitrary interface transparencies using both the
scattering approach of Blonder, Tinkham and Klapwik and a microscopic Green's
function approach. Surprisingly, negative crossed conductance in such set-ups
[R. Melin and D. Feinberg, Phys. Rev. B 70, 174509 (2004)] does not preclude
the possibility of positive noise cross-correlations for almost transparent
contacts. We conclude with a phenomenological discussion of interactions in the
one dimensional leads connected to the superconductor, which induce sign
changes in the noise cross-correlations.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 19:00:22 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jan 2008 10:26:52 GMT"
},
{
"version": "v3",
"created": "Wed, 3 Jan 2018 14:13:40 GMT"
}
] | 2018-01-04T00:00:00 | [
[
"Mélin",
"R.",
""
],
[
"Benjamin",
"C.",
""
],
[
"Martin",
"T.",
""
]
] |
0708.0567 | Timothy Dulaney | Timothy R. Dulaney, Mark B. Wise | Flavor Changing Neutral Currents in the Lee-Wick Standard Model | 13 pages, 2 figures | Phys.Lett.B658:230-235,2008 | 10.1016/j.physletb.2007.08.049 | CALT 68-2656 | hep-ph | null | Recently an extension of the standard model (the Lee-Wick standard model)
based on ideas of Lee and Wick (LW) was introduced. It does not contain
quadratic divergences in the Higgs mass and hence solves the hierarchy puzzle.
The LW-standard model contains new heavy LW-resonances at the TeV scale that
decay to ordinary particles. In this paper we examine in more detail the flavor
structure of the theory. We integrate out the heavy LW-fermions at tree level
and find that this induces flavor changing Z boson couplings. However, these
flavor changing neutral currents are acceptably small since they are
automatically suppressed by small Yukawa couplings. This is the case even
though the theory does not satisfy the principle of minimal flavor violation.
New couplings of the charged W bosons to quarks and leptons are also induced.
We also integrate out the LW-Higgs and examine the four-fermion operators
induced.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 18:53:16 GMT"
},
{
"version": "v2",
"created": "Sun, 5 Aug 2007 01:23:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dulaney",
"Timothy R.",
""
],
[
"Wise",
"Mark B.",
""
]
] |
0708.0568 | Douglas Hardin | J. S. Brauchart, D. P. Hardin and E. B. Saff | The support of the limit distribution of optimal Riesz energy points on
sets of revolution in $\mathbb{R}^{3}$ | null | null | 10.1063/1.2817823 | null | math-ph math.MP | null | Let A be a compact set in the right-half plane and $\Gamma(A)$ the set in
$\mathbb{R}^{3}$ obtained by rotating A about the vertical axis. We investigate
the support of the limit distribution of minimal energy point charges on
$\Gamma(A)$ that interact according to the Riesz potential 1/r^{s}, 0<s<1,
where r is the Euclidean distance between points. Potential theory yields that
this limit distribution coincides with the equilibrium measure on $\Gamma(A)$
which is supported on the outer boundary of $\Gamma(A)$. We show that there are
sets of revolution $\Gamma(A)$ such that the support of the equilibrium measure
on $\Gamma(A)$ is {\bf not} the complete outer boundary, in contrast to the
Coulomb case s=1. However, the support of the limit distribution on the set of
revolution $\Gamma(R+A)$ as R goes to infinity, is the full outer boundary for
certain sets A, in contrast to the logarithmic case (s=0).
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 19:13:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brauchart",
"J. S.",
""
],
[
"Hardin",
"D. P.",
""
],
[
"Saff",
"E. B.",
""
]
] |
0708.0569 | Arman Cingoz | S. J. Ferrell, A. Cing\"oz, A. Lapierre, A.-T. Nguyen, N. Leefer, D.
Budker, V. V. Flambaum, S. K. Lamoreaux, and J. R. Torgerson | Investigation of the Gravitational Potential Dependence of the
Fine-Structure Constant Using Atomic Dysprosium | 6 pages, 3 figures | Phys. Rev. A 76, 062104 (2007) | 10.1103/PhysRevA.76.062104 | null | physics.atom-ph astro-ph hep-ph | null | Radio-frequency E1 transitions between nearly degenerate, opposite parity
levels of atomic dysprosium were monitored over an eight month period to search
for a variation in the fine-structure constant. During this time period, data
were taken at different points in the gravitational potential of the Sun. The
data are fitted to the variation in the gravitational potential yielding a
value of $(-8.7 \pm 6.6) \times 10^{-6}$ for the fit parameter $k_\alpha$. This
value gives the current best laboratory limit. In addition, our value of
$k_{\alpha}$ combined with other experimental constraints is used to extract
the first limits on k_e and k_q. These coefficients characterize the variation
of m_e/m_p and m_q/m_p in a changing gravitational potential, where m_e, m_p,
and m_q are electron, proton, and quark masses. The results are $k_e = (4.9 \pm
3.9) \times 10^{-5}$ and $k_q = (6.6 \pm 5.2) \times 10^{-5}$.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 19:13:31 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 23:54:42 GMT"
}
] | 2012-08-31T00:00:00 | [
[
"Ferrell",
"S. J.",
""
],
[
"Cingöz",
"A.",
""
],
[
"Lapierre",
"A.",
""
],
[
"Nguyen",
"A. -T.",
""
],
[
"Leefer",
"N.",
""
],
[
"Budker",
"D.",
""
],
[
"Flambaum",
"V. V.",
""
],
[
"Lamoreaux",
"S. K.",
""
],
[
"Torgerson",
"J. R.",
""
]
] |
0708.0570 | Doug Geisler | Doug Geisler (Universidad de Concepcion), George Wallerstein
(University of Washington), Verne V. Smith (National Optical Astronomy
Observtory), Dana I. Casetti-Dinescu (Yale University) | Chemical Abundances and Kinematics in Globular Clusters and Local Group
Dwarf Galaxies and Their Implications for Formation Theories of the Galactic
Halo | 38 pages, 14 figures, Invited Review to appear in PASP | null | 10.1086/521990 | null | astro-ph | null | We review Galactic halo formation theories and supporting evidence, in
particular kinematics and detailed chemical abundances of stars in some
relevant globular clusters as well as Local Group dwarf galaxies. Outer halo
red HB clusters tend to have large eccentricities and inhabit the area
populated by dwarf spheroidal stars, favoring an extraGalactic origin. Old
globulars show the full range of eccentricities, while younger ones seem to
have preferentially high eccentricities, again hinting at their extraGalactic
origin. We compare detailed abundances of a variety of elements between the
halo and all dwarf galaxies studied to date, including both dwarf spheroidals
and irregulars. The salient feature is that halo abundances are essentially
unique. In particular, the general alpha vs. [Fe/H] pattern of 12 of the 13
galaxies studied are similar to each other and very different from the Milky
Way. Sagittarius appears to be the only possible exception. It appears very
unlikely that a significant fraction of the metal-rich halo could have come
from disrupted dwarf galaxies of low mass. However, at least some of the
metal-poor halo may have come from typical dwarfs, and a portion of the
intermediate metallicity halo may have come from very massive systems. The
chemical differences between the dwarfs and the halo are due to a combination
of a low star formation efficiency and a high galactic wind efficiency in the
former. The formation problem may be solved if the majority of halo stars
formed within a few, very massive satellites accreted very early. However, any
such satellites must either be accreted MUCH earlier than postulated, before
the onset of SNe Ia , or star formation must be prevented to occur in them
until only shortly before they are accreted.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 19:30:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Geisler",
"Doug",
"",
"Universidad de Concepcion"
],
[
"Wallerstein",
"George",
"",
"University of Washington"
],
[
"Smith",
"Verne V.",
"",
"National Optical Astronomy\n Observtory"
],
[
"Casetti-Dinescu",
"Dana I.",
"",
"Yale University"
]
] |
0708.0571 | Terrence Bisson | Terrence P. Bisson, Aristide Tsemo | Extended powers and Steenrod operations in algebraic geometry | 12 pages, plain tex, uses Paul Taylor's diagrams | null | null | null | math.AG math.AT | null | Steenrod operations have been defined by Voedvodsky in motivic cohomology in
order to show the Milnor and Bloch-Kato conjectures. These operations have also
been constructed by Brosnan for Chow rings. The purpose of this paper is to
provide a setting for the construction of the Steenrod operations in algebraic
geometry, for generalized cohomology theories whose formal group law has order
two. We adapt the methods used by Bisson-Joyal in studying Steenrod and
Dyer-Lashof operations in unoriented cobordism and mod 2 cohomology.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 19:38:59 GMT"
},
{
"version": "v2",
"created": "Sat, 4 Aug 2007 20:13:07 GMT"
}
] | 2007-08-06T00:00:00 | [
[
"Bisson",
"Terrence P.",
""
],
[
"Tsemo",
"Aristide",
""
]
] |
0708.0572 | Eduardo Candelario-Jalil | E. Candelario-Jalil, N. H. Mhadu, S. M. Al-Dalain, G. Martinez, O. S.
Leon | Time course of oxidative damage in different brain regions following
transient cerebral ischemia in gerbils | null | Neuroscience Research 41(3): 233-241 (2001) | null | null | q-bio.TO | null | The time course of oxidative damage in different brain regions was
investigated in the gerbil model of transient cerebral ischemia. Animals were
subjected to both common carotid arteries occlusion for 5 min. After the end of
ischemia and at different reperfusion times (2, 6, 12, 24, 48, 72, 96 h and 7
days), markers of lipid peroxidation, reduced and oxidized glutathione levels,
glutathione peroxidase, glutathione reductase, manganese-dependent superoxide
dismutase (MnSOD) and copper/zinc containing SOD (Cu/ZnSOD) activities were
measured in hippocampus, cortex and striatum. Oxidative damage in hippocampus
was maximal at late stages after ischemia (48-96 h) coincident with a
significant impairment in glutathione homeostasis. MnSOD increased in
hippocampus at 24, 48 and 72 h after ischemia, coincident with the marked
reduction in the activity of glutathione-related enzymes. The late disturbance
in oxidant-antioxidant balance corresponds with the time course of delayed
neuronal loss in the hippocampal CA1 sector. Cerebral cortex showed early
changes in oxidative damage with no significant impairment in antioxidant
capacity. Striatal lipid peroxidation significantly increased as early as 2 h
after ischemia and persisted until 48 h with respect to the sham-operated
group. These results contribute significant information on the timing and
factors that influence free radical formation following ischemic brain injury,
an essential step in determining effective antioxidant intervention.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 19:42:03 GMT"
}
] | 2007-08-06T00:00:00 | [
[
"Candelario-Jalil",
"E.",
""
],
[
"Mhadu",
"N. H.",
""
],
[
"Al-Dalain",
"S. M.",
""
],
[
"Martinez",
"G.",
""
],
[
"Leon",
"O. S.",
""
]
] |
0708.0573 | Don N. Page | Don N. Page | The Height of a Giraffe | 12 pages, LaTeX | Found.Phys.39:1097-1108,2009 | 10.1007/s10701-009-9322-9 | Alberta-11-07 | hep-th | null | A minor modification of the arguments of Press and Lightman leads to an
estimate of the height of the tallest running, breathing organism on a
habitable planet as the Bohr radius multiplied by the three-tenths power of the
ratio of the electrical to gravitational forces between two protons (rather
than the one-quarter power that Press got for the largest animal that would not
break in falling over, after making an assumption of unreasonable brittleness).
My new estimate gives a height of about 3.6 meters rather than Press's original
estimate of about 2.6 cm. It also implies that the number of atoms in the
tallest runner is very roughly of the order of the nine-tenths power of the
ratio of the electrical to gravitational forces between two protons, which is
about 3 x 10^32.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 20:00:02 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 23:51:08 GMT"
}
] | 2009-10-02T00:00:00 | [
[
"Page",
"Don N.",
""
]
] |
0708.0574 | Stephan Stieberger | Stephan Stieberger, Tomasz R. Taylor | Supersymmetry Relations and MHV Amplitudes in Superstring Theory | 34 pages, harvmac; v2: 2 figs added; final version to appear in NPB | Nucl.Phys.B793:83-113,2008 | 10.1016/j.nuclphysb.2007.09.033 | MPP-2007-79 | hep-th | null | We discuss supersymmetric Ward identities relating various scattering
amplitudes in type I open superstring theory. We show that at the disk level,
the form of such relations remains exactly the same, to all orders in alpha',
as in the low-energy effective field theory describing the alpha'-> 0 limit.
This result holds in D=4 for all compactifications, even for those that break
supersymmetry. We apply SUSY relations to the computations of N-gluon MHV
superstring amplitudes, simplifying the existing results for N<7 and deriving a
compact expression for N=7.
| [
{
"version": "v1",
"created": "Sun, 5 Aug 2007 23:24:59 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Oct 2007 11:22:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Stieberger",
"Stephan",
""
],
[
"Taylor",
"Tomasz R.",
""
]
] |
0708.0575 | Yair Kurzweil | Yair Kurzweil, Roi Baer | Adapting approximate memory potentials for time-dependent density
functional theory | null | null | 10.1103/PhysRevB.77.085121 | null | cond-mat.str-el cond-mat.mtrl-sci | null | Frequency dependent exchange correlation kernels for time-dependent density
functional theory can be used to construct approximate exchange-correlation
potentials. The resulting potentials are usually not translationally covariant
nor do they obey the so-called zero-force condition. These two basic symme-try
requirements are essential for using the potentials in actual applications
(even within the linear re-sponse regime). We provide two pragmatic methods for
imposing these conditions. As an example we take the Gross and Kohn (GK)
frequency dependent XC functional (Phys. Rev.Lett. 55, 2850 (1985)), correct
it, and numerically test it on a sodium metal cluster. Violation of the basic
symme-tries causes instabilities or spurious low frequency modes.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 19:44:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kurzweil",
"Yair",
""
],
[
"Baer",
"Roi",
""
]
] |
0708.0576 | Tamas Gal | Tamas Gal | Treatments of the exchange energy in density-functional theory | 19 pages; original manuscript from 2001 (v1) revised for publication,
with presentation substantially improved, some errors corrected, plus an
additional summarizing figure (Appendix B) included | Int. J. Mod. Phys. B 22, 2225 (2008) | 10.1142/S0217979208039344 | null | physics.chem-ph cond-mat.other physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following a recent work [Gal, Phys. Rev. A 64, 062503 (2001)], a simple
derivation of the density-functional correction of the Hartree-Fock equations,
the Hartree-Fock-Kohn-Sham equations, is presented, completing an integrated
view of quantum mechanical theories, in which the Kohn-Sham equations, the
Hartree-Fock-Kohn-Sham equations and the ground-state Schrodinger equation
formally stem from a common ground: density-functional theory, through its
Euler equation for the ground-state density. Along similar lines, the Kohn-Sham
formulation of the Hartree-Fock approach is also considered. Further, it is
pointed out that the exchange energy of density-functional theory built from
the Kohn-Sham orbitals can be given by degree-two homogeneous N-particle
density functionals (N=1,2,...), forming a sequence of degree-two homogeneous
exchange-energy density functionals, the first element of which is minus the
classical Coulomb-repulsion energy functional.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 20:06:46 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Sep 2008 19:56:28 GMT"
}
] | 2008-09-11T00:00:00 | [
[
"Gal",
"Tamas",
""
]
] |
0708.0577 | Frederick W. Strauch | Frederick W. Strauch and Carl J. Williams | Theoretical analysis of perfect quantum state transfer with
superconducting qubits | 7 pages, 4 figures; title changed, minor errors corrected, published
version | Phys. Rev. B 78, 094516 (2008) | 10.1103/PhysRevB.78.094516 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superconducting quantum circuits, fabricated with multiple layers, are
proposed to implement perfect quantum state transfer between nodes of a
hypercube network. For tunable devices such as the phase qubit, each node can
transmit quantum information to any other node at a constant rate independent
of the distance between qubits. The physical limits of quantum state transfer
in this network are theoretically analyzed, including the effects of disorder,
decoherence, and higher-order couplings.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 20:16:14 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Aug 2008 05:18:32 GMT"
},
{
"version": "v3",
"created": "Fri, 12 Dec 2008 22:41:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Strauch",
"Frederick W.",
""
],
[
"Williams",
"Carl J.",
""
]
] |
0708.0578 | Edmond Berger | Edmond L Berger, Jian-Wei Qiu, and Ricardo A. Rodriguez-Pedraza | Transverse momentum dependence of the angular distribution of the
Drell-Yan process | 18 pages, 4 figures; typos corrected, references updated, a few
clarifications recommended by the referee. Paper accepted for publication in
Physical Review D | Phys.Rev.D76:074006,2007 | 10.1103/PhysRevD.76.074006 | Argonne report ANL-HEP-PR-07-53 | hep-ph hep-ex | null | We calculate the transverse momentum Q_{\perp} dependence of the helicity
structure functions for the hadroproduction of a massive pair of leptons with
pair invariant mass Q. These structure functions determine the angular
distribution of the leptons in the pair rest frame. Unphysical behavior in the
region Q_{\perp} --> 0 is seen in the results of calculations done at
fixed-order in QCD perturbation theory. We use current conservation to
demonstrate that the unphysical inverse-power and \ln(Q/Q_{\perp}) logarithmic
divergences in three of the four independent helicity structure functions share
the same origin as the divergent terms in fixed-order calculations of the
angular-integrated cross section. We show that the resummation of these
divergences to all orders in the strong coupling strength \alpha_s can be
reduced to the solved problem of the resummation of the divergences in the
angular-integrated cross section, resulting in well-behaved predictions in the
small Q_{\perp} region. Among other results, we show the resummed part of the
helicity structure functions preserves the Lam-Tung relation between the
longitudinal and double spin-flip structure functions as a function of
Q_{\perp} to all orders in \alpha_s.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 20:09:33 GMT"
},
{
"version": "v2",
"created": "Sat, 29 Sep 2007 22:19:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Berger",
"Edmond L",
""
],
[
"Qiu",
"Jian-Wei",
""
],
[
"Rodriguez-Pedraza",
"Ricardo A.",
""
]
] |
0708.0579 | Brian McNamara | B.R. McNamara (U. Waterloo), L. Birzan (Ohio U.), D.A. Rafferty (Ohio
U.), P.E.J. Nulsen (CfA), C. Carilli (NRAO), M.W. Wise (U. Amsterdam) | Jet Interactions with the Hot Halos of Clusters and Galaxies | 10 pages, 3 figures, invited review, "Extragalactic Jets: Theory and
Observation from Radio to Gamma Ray, held in Girdwood, Alaska, U.S.A. 21-24
May, 2007, minor text changes; one added reference | null | null | null | astro-ph | null | X-ray observations of cavities and shock fronts produced by jets streaming
through hot halos have significantly advanced our understanding of the
energetics and dynamics of extragalactic radio sources. Radio sources at the
centers of clusters have dynamical ages between ten and several hundred million
years. They liberate between 1E58-1E62 erg per outburst, which is enough energy
to regulate cooling of hot halos from galaxies to the richest clusters. Jet
power scales approximately with the radio synchrotron luminosity to the one
half power. However, the synchrotron efficiency varies widely from nearly unity
to one part in 10,000, such that relatively feeble radio source can have
quasar-like mechanical power. The synchrotron ages of cluster radio sources are
decoupled from their dynamical ages, which tend to be factors of several to
orders of magnitude older. Magnetic fields and particles in the lobes tend to
be out of equipartition. The lobes may be maintained by heavy particles (e.g.,
protons), low energy electrons, a hot, diffuse thermal gas, or possibly
magnetic (Poynting) stresses. Sensitive X-ray images of shock fronts and
cavities can be used to study the dynamics of extragalactic radio sources.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 20:26:35 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 15:59:15 GMT"
}
] | 2007-08-29T00:00:00 | [
[
"McNamara",
"B. R.",
"",
"U. Waterloo"
],
[
"Birzan",
"L.",
"",
"Ohio U."
],
[
"Rafferty",
"D. A.",
"",
"Ohio\n U."
],
[
"Nulsen",
"P. E. J.",
"",
"CfA"
],
[
"Carilli",
"C.",
"",
"NRAO"
],
[
"Wise",
"M. W.",
"",
"U. Amsterdam"
]
] |
0708.0580 | David Pritchard | David Pritchard | Efficient Divide-and-Conquer Implementations Of Symmetric FSAs | null | Journal of Cellular Automata 5(6) (special issue for Automata
2007, H. Fuks & A. T. Lawniczak, eds), pages 481-490, 2010 | null | null | cs.FL cs.DM | http://creativecommons.org/licenses/by/3.0/ | A deterministic finite-state automaton (FSA) is an abstract sequential
machine that reads the symbols comprising an input word one at a time. An FSA
is symmetric if its output is independent of the order in which the input
symbols are read, i.e., if the output is invariant under permutations of the
input. We show how to convert a symmetric FSA A into an automaton-like
divide-and-conquer process whose intermediate results are no larger than the
size of A's memory. In comparison, a similar result for general FSA's has been
long known via functional composition, but entails an exponential increase in
memory size. The new result has applications to parallel processing and
symmetric FSA networks.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 20:21:36 GMT"
},
{
"version": "v2",
"created": "Mon, 31 Mar 2008 15:48:20 GMT"
},
{
"version": "v3",
"created": "Thu, 5 Aug 2010 09:18:56 GMT"
}
] | 2010-08-06T00:00:00 | [
[
"Pritchard",
"David",
""
]
] |
0708.0581 | Eduardo Candelario-Jalil | E. Candelario-Jalil, D. Alvarez, J. M. Castaneda, S. M. Al-Dalain, G.
Martinez-Sanchez, N. Merino, O. S. Leon | The highly selective cyclooxygenase-2 inhibitor DFU is neuroprotective
when given several hours after transient cerebral ischemia in gerbils | null | Brain Research 927(2): 212-215 (2002) | null | null | q-bio.TO | null | Several studies suggest that cyclooxygenase-2 contributes to the delayed
progression of ischemic brain damage. In this study we examined whether the
highly selective cyclooxygenase-2 inhibitor DFU reduces neuronal damage when
administered several hours after 5 min of transient forebrain ischemia in
gerbils. The extent of ischemic injury was assessed behaviorally by measuring
the increases in locomotor activity and by histopathological evaluation of the
extent of CA1 hippocampal pyramidal cell injury 7 days after ischemia. DFU
treatment (10 mg/kg, p.o.) significantly reduced hippocampal neuronal damage
even if the treatment is delayed until 12 h after ischemia. These results
suggest that selective cyclooxygenase-2 inhibitors may be a valuable
therapeutic strategy for ischemic brain injury.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 20:18:25 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Candelario-Jalil",
"E.",
""
],
[
"Alvarez",
"D.",
""
],
[
"Castaneda",
"J. M.",
""
],
[
"Al-Dalain",
"S. M.",
""
],
[
"Martinez-Sanchez",
"G.",
""
],
[
"Merino",
"N.",
""
],
[
"Leon",
"O. S.",
""
]
] |
0708.0582 | Monwhea Jeng | M. Jeng, J. M. Schwarz | On the study of jamming percolation | 13 pages, 18 figures; Spiral model does satisfy property B | null | 10.1007/s10955-008-9514-2 | null | cond-mat.dis-nn cond-mat.stat-mech | null | We investigate kinetically constrained models of glassy transitions, and
determine which model characteristics are crucial in allowing a rigorous proof
that such models have discontinuous transitions with faster than power law
diverging length and time scales. The models we investigate have constraints
similar to that of the knights model, introduced by Toninelli, Biroli, and
Fisher (TBF), but differing neighbor relations. We find that such knights-like
models, otherwise known as models of jamming percolation, need a ``No Parallel
Crossing'' rule for the TBF proof of a glassy transition to be valid.
Furthermore, most knight-like models fail a ``No Perpendicular Crossing''
requirement, and thus need modification to be made rigorous. We also show how
the ``No Parallel Crossing'' requirement can be used to evaluate the provable
glassiness of other correlated percolation models, by looking at models with
more stable directions than the knights model. Finally, we show that the TBF
proof does not generalize in any straightforward fashion for three-dimensional
versions of the knights-like models.
| [
{
"version": "v1",
"created": "Sun, 5 Aug 2007 18:47:47 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 21:50:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jeng",
"M.",
""
],
[
"Schwarz",
"J. M.",
""
]
] |
0708.0583 | Thomas Quella | Thomas Creutzig, Thomas Quella, Volker Schomerus | Branes in the GL(1|1) WZNW-Model | 38 pages | Nucl.Phys.B792:257-283,2008 | 10.1016/j.nuclphysb.2007.09.014 | DESY 07-109 | hep-th | null | We initiate a systematic study of boundary conditions in conformal field
theories with target space supersymmetry. The WZNW model on GL(1|1) is used as
a prototypical example for which we find the complete set of maximally
symmetric branes. This includes a unique brane of maximal super-dimension 2|2,
a 2-parameter family of branes with super-dimension 0|2 and an infinite set of
fully localized branes possessing a single modulus. Members of the latter
family can only exist along certain lines on the bosonic base, much like
fractional branes at orbifold singularities. Our results establish that all
essential algebraic features of Cardy-type boundary theories carry over to the
non-rational logarithmic WZNW model on GL(1|1).
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 20:30:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Creutzig",
"Thomas",
""
],
[
"Quella",
"Thomas",
""
],
[
"Schomerus",
"Volker",
""
]
] |
0708.0584 | Antia Lamas-Linares | Cyril Branciard, Alexander Ling, Nicolas Gisin, Christian Kurtsiefer,
Antia Lamas-Linares, Valerio Scarani | Experimental Falsification of Leggett's Non-Local Variable Model | 5 pages, 3 figures, 1 table | Phys. Rev. Lett. 99, 210407 (2007) | 10.1103/PhysRevLett.99.210407 | null | quant-ph | null | Bell's theorem guarantees that no model based on local variables can
reproduce quantum correlations. Also some models based on non-local variables,
if subject to apparently "reasonable" constraints, may fail to reproduce
quantum physics. In this paper, we introduce a family of inequalities, which
allow testing Leggett's non-local model versus quantum physics, and which can
be tested in an experiment without additional assumptions. Our experimental
data falsify Leggett's model and are in agreement with quantum predictions.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 16:43:31 GMT"
}
] | 2008-01-02T00:00:00 | [
[
"Branciard",
"Cyril",
""
],
[
"Ling",
"Alexander",
""
],
[
"Gisin",
"Nicolas",
""
],
[
"Kurtsiefer",
"Christian",
""
],
[
"Lamas-Linares",
"Antia",
""
],
[
"Scarani",
"Valerio",
""
]
] |
0708.0585 | Steve Croft | Steve Croft, Wim de Vries and Robert H. Becker (UC Davis / LLNL) | Radio AGN in 13,240 galaxy clusters from the Sloan Digital Sky Survey | 14 pages, 6 figures, accepted for publication in ApJL | null | 10.1086/522086 | null | astro-ph | null | We correlate the positions of 13,240 Brightest Cluster Galaxies (BCGs) with
0.1 <= z <= 0.3 from the maxBCG catalog with radio sources from the FIRST
survey to study the sizes and distributions of radio AGN in galaxy clusters. We
find that 19.7% of our BCGs are associated with FIRST sources, and this
fraction depends on the stellar mass of the BCG, and to a lesser extent on the
richness of the parent cluster (in the sense of increasing radio loudness with
increasing mass). The intrinsic size of the radio emission associated with the
BCGs peaks at 55 kpc, with a tail extending to 200 kpc. The radio power of the
extended sources places them on the divide between FR I and FR II type sources,
while sources compact in the radio tend to be somewhat less radio-luminous. We
also detect an excess of radio sources associated with the cluster, instead of
with the BCG itself, extending out to ~1.4 Mpc.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 21:06:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Croft",
"Steve",
"",
"UC Davis / LLNL"
],
[
"de Vries",
"Wim",
"",
"UC Davis / LLNL"
],
[
"Becker",
"Robert H.",
"",
"UC Davis / LLNL"
]
] |
0708.0586 | James A. Mingo | James A. Mingo (Queen's University), Roland Speicher (Queen's
University), Edward Tan (Queen's University) | Second Order Cumulants of products | 37 pages, 23 figures | Trans. Amer. Math. Soc., vol. 361 (2009) 4751 -- 4781 | 10.1090/S0002-9947-09-04696-0 | null | math.OA math.PR | null | We derive a formula which expresses a second order cumulant whose entries are
products as a sum of cumulants where the entries are single factors. This
extends to the second order case the formula of Krawczyk and Speicher. We apply
our result to the problem of calculating the second order cumulants of a
semi-circular and Haar unitary operator.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 21:10:33 GMT"
}
] | 2009-05-22T00:00:00 | [
[
"Mingo",
"James A.",
"",
"Queen's University"
],
[
"Speicher",
"Roland",
"",
"Queen's\n University"
],
[
"Tan",
"Edward",
"",
"Queen's University"
]
] |
0708.0587 | Fabrizio Illuminati | L. Campos Venuti, S. M. Giampaolo, F. Illuminati, P. Zanardi | Long-distance entanglement and quantum teleportation in XX spin chains | 9 pages, 6 figures | Phys. Rev. A 76, 052328 (2007) | 10.1103/PhysRevA.76.052328 | null | quant-ph cond-mat.other hep-th math-ph math.MP | null | Isotropic XX models of one-dimensional spin-1/2 chains are investigated with
the aim to elucidate the formal structure and the physical properties that
allow these systems to act as channels for long-distance, high-fidelity quantum
teleportation. We introduce two types of models: I) open, dimerized XX chains,
and II) open XX chains with small end bonds. For both models we obtain the
exact expressions for the end-to-end correlations and the scaling of the energy
gap with the length of the chain. We determine the end-to-end concurrence and
show that model I) supports true long-distance entanglement at zero
temperature, while model II) supports {\it ``quasi long-distance''}
entanglement that slowly falls off with the size of the chain. Due to the
different scalings of the gaps, respectively exponential for model I) and
algebraic in model II), we demonstrate that the latter allows for efficient
qubit teleportation with high fidelity in sufficiently long chains even at
moderately low temperatures.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 21:31:01 GMT"
}
] | 2009-07-02T00:00:00 | [
[
"Venuti",
"L. Campos",
""
],
[
"Giampaolo",
"S. M.",
""
],
[
"Illuminati",
"F.",
""
],
[
"Zanardi",
"P.",
""
]
] |
0708.0588 | Traian A. Pirvu Dr | Ivar Ekeland and Traian A. Pirvu | Investment and Consumption without Commitment | null | null | null | null | q-fin.PM math.OC math.PR | null | In this paper, we investigate the Merton portfolio management problem in the
context of non-exponential discounting. This gives rise to time-inconsistency
of the decision-maker. If the decision-maker at time t=0 can commit his/her
successors, he/she can choose the policy that is optimal from his/her point of
view, and constrain the others to abide by it, although they do not see it as
optimal for them. If there is no commitment mechanism, one must seek a
subgame-perfect equilibrium strategy between the successive decision-makers. In
the line of the earlier work by Ekeland and Lazrak we give a precise definition
of equilibrium strategies in the context of the portfolio management problem,
with finite horizon, we characterize it by a system of partial differential
equations, and we show existence in the case when the utility is CRRA and the
terminal time T is small. We also investigate the infinite-horizon case and we
give two different explicit solutions in the case when the utility is CRRA (in
contrast with the case of exponential discount, where there is only one). Some
of our results are proved under the assumption that the discount function h(t)
is a linear combination of two exponentials, or is the product of an
exponential by a linear function.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 21:45:07 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Ekeland",
"Ivar",
""
],
[
"Pirvu",
"Traian A.",
""
]
] |
0708.0589 | Joshua Davis | Joshua L. Davis, Michael Gutperle, Per Kraus, Ivo Sachs | Stringy NJL and Gross-Neveu models at finite density and temperature | 32 pages, uses JHEP3.cls; v2, references added, version to be
submitted to JHEP | JHEP0710:049,2007 | 10.1088/1126-6708/2007/10/049 | null | hep-th | null | Nonlocal stringy versions of the Nambu-Jona-Lasinio and Gross-Neveu models
arise in a certain limit of holographic QCD. We analyze the phase structure at
finite density and temperature at strong coupling in terms of probe branes in
the gravity dual. Comparison with the phase structure of the local field theory
models shows qualitative agreement with some aspects, and disagreement with
others. Finally, we explain how to construct the Landau potentials for these
models by taking the probe branes off-shell.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 21:56:25 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Sep 2007 19:38:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Davis",
"Joshua L.",
""
],
[
"Gutperle",
"Michael",
""
],
[
"Kraus",
"Per",
""
],
[
"Sachs",
"Ivo",
""
]
] |
0708.0590 | Dmytro Pesin | D. A. Pesin, A. V. Andreev | Nonperturbative interaction effects in the thermodynamics of disordered
wires | 18 pages | Phys. Rev. B 76, 235108 (2007) | 10.1103/PhysRevB.76.235108 | null | cond-mat.mes-hall cond-mat.dis-nn | null | We study nonperturbative interaction corrections to the thermodynamic
quantities of multichannel disordered wires in the presence of the Coulomb
interactions. Within the replica nonlinear $\sigma$-model (NL$\sigma$M)
formalism, they arise from nonperturbative soliton saddle points of the
NL$\sigma$M action. The problem is reduced to evaluating the partition function
of a replicated classical one dimensional Coulomb gas. The state of the latter
depends on two parameters: the number of transverse channels in the wire,
N_{ch}, and the dimensionless conductance, G(L_T), of a wire segment of length
equal to the thermal diffusion length, L_T. At relatively high temperatures,
$G(L_T) \gtrsim \ln N_{ch} $, the gas is dimerized, i.e. consists of bound
neutral pairs. At lower temperatures, $\ln N_{ch} \gtrsim G(L_T) \gtrsim 1$,
the pairs overlap and form a Coulomb plasma. The crossover between the two
regimes occurs at a parametrically large conductance $G(L_T) \sim \ln N_{ch}$,
and may be studied independently from the perturbative effects. Specializing to
the high temperature regime, we obtain the leading nonperturbative correction
to the wire heat capacity. Its ratio to the heat capacity for noninteracting
electrons, C_0, is $\delta C/C_0\sim N_{ch}G^2(L_T)e^{-2G(L_T)}$.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 20:24:14 GMT"
}
] | 2012-07-19T00:00:00 | [
[
"Pesin",
"D. A.",
""
],
[
"Andreev",
"A. V.",
""
]
] |
0708.0591 | John Quiroga Hurtado | Emilio Elizalde, John Quiroga Hurtado, Hector Ivan Arcos | De Sitter cosmology from Gauss-Bonnet dark energy with quantum effects | 8 latex pages, 3 figures, paper submitted in PRD | Int.J.Mod.Phys.D17:2159-2170,2008 | 10.1142/S0218271808013777 | null | gr-qc | null | A Gauss-Bonnet dark energy model is considered, which is inspired in
string/M-theory and takes also into account quantum contributions. Those are
introduced from a conformal quantum anomaly. The corresponding solutions for
the Hubble rate, $H$, are studied starting from the Friedmann-Robertson-Walker
equation. It is seen that, as a pure effect of the quantum contributions, a new
solution for $H$ exists in some region, which does not appear in the classical
case. The behavior of all encountered solutions is studied with care, in
particular, the role played by the quantum correction term--which depends on
the number of matter fields--on the stability of the solutions around its
asymptotic value. It is argued that, contrary to what happens in the classical
case, quantum effects remarkably lead to the realization of a de Sitter stage
which corresponds to the inflation/dark energy stages, even for positive values
of the f_0 constant (coupling of the field with the Gauss-Bonnet invariant).
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 14:41:03 GMT"
}
] | 2009-02-11T00:00:00 | [
[
"Elizalde",
"Emilio",
""
],
[
"Hurtado",
"John Quiroga",
""
],
[
"Arcos",
"Hector Ivan",
""
]
] |
0708.0592 | Tien Quang Nguyen | Nguyen Tien Quang | The Coherence Theorem for Ann-Categories | 10 peges | (in Vietnamese) Vietnam Journal of Mathematics Vol. XVI, No 1,
1988 | null | null | math.CT | null | This paper presents the proof of the coherence theorem for Ann-categories
whose set of axioms and original basic properties were given in [9]. Let
$$\A=(\A,{\Ah},c,(0,g,d),a,(1,l,r),{\Lh},{\Rh})$$ be an Ann-category. The
coherence theorem states that in the category $ \A$, any morphism built from
the above isomorphisms and the identification by composition and the two
operations $\tx$, $\ts$ only depends on its source and its target.
The first coherence theorems were built for monoidal and symmetric monoidal
categories by Mac Lane [7]. After that, as shown in the References, there are
many results relating to the coherence problem for certain classes of
categories.
For Ann-categories, applying Hoang Xuan Sinh's ideas used for Gr-categories
in [2], the proof of the coherence theorem is constructed by faithfully
``embedding'' each arbitrary Ann-category into a quite strict Ann-category.
Here, a {\it quite strict} Ann-categogy is an Ann-category whose all
constraints are strict, except for the commutativity and left distributivity
ones.
This paper is the work continuing from [9]. If there is no explanation, the
terminologies and notations in this paper mean as in [9].
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 22:42:23 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Quang",
"Nguyen Tien",
""
]
] |
0708.0593 | Alain Ulacia Rey A.Ulacia Rey | A. Ulacia Rey, A. Perez Martinez and Roberto A. Sussman | Local dynamics and gravitational collapse of a self-gravitating
magnetized Fermi gas | 6 pages, 3 figures (accepted in General Relativity and Gravitation) | Gen.Rel.Grav.40:1499-1510,2008 | 10.1007/s10714-007-0542-z | null | gr-qc astro-ph hep-th | null | We use the Bianchi-I spacetime to study the local dynamics of a magnetized
self-gravitating Fermi gas. The set of Einstein-Maxwell field equations for
this gas becomes a dynamical system in a 4-dimensional phase space. We consider
a qualitative study and examine numeric solutions for the degenerate zero
temperature case. All dynamic quantities exhibit similar qualitative behavior
in the 3-dimensional sections of the phase space, with all trajectories
reaching a stable attractor whenever the initial expansion scalar H_{0} is
negative. If H_{0} is positive, and depending on initial conditions, the
trajectories end up in a curvature singularity that could be isotropic(singular
"point") or anisotropic (singular "line"). In particular, for a sufficiently
large initial value of the magnetic field it is always possible to obtain an
anisotropic type of singularity in which the "line" points in the same
direction of the field.
| [
{
"version": "v1",
"created": "Fri, 3 Aug 2007 23:15:42 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Nov 2007 00:03:22 GMT"
}
] | 2008-12-16T00:00:00 | [
[
"Rey",
"A. Ulacia",
""
],
[
"Martinez",
"A. Perez",
""
],
[
"Sussman",
"Roberto A.",
""
]
] |
0708.0594 | Ila Fiete | Yoram Burak and Ila R. Fiete | Do we understand the emergent dynamics of grid cell activity? | null | J. Neurosci. 26(37) pp. 9352-4 (2006) | null | null | q-bio.NC q-bio.TO | null | We examine the qualitative and quantitative properties of continuous
attractor networks in explaining the dynamics of grid cells.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 00:34:47 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Burak",
"Yoram",
""
],
[
"Fiete",
"Ila R.",
""
]
] |
0708.0595 | Edgardo Ugalde | Beatriz Luna and Edgardo Ugalde | Dominant Vertices in Regulatory Networks Dynamics | null | null | 10.1016/j.physd.2008.04.007 | null | nlin.AO nlin.CG | null | Discrete-time regulatory networks are dynamical systems on directed graphs,
with a structure inspired on natural systems of interacting units. There is a
natural notion of determination amongst vertices, which we use to classify the
nodes of the network, and to determine what we call "sets of dominant
vertices". In this paper we prove that in the asymptotic regime, the projection
of the dynamics on a dominant set allows us to determine the state of the whole
system at all times. We provide an algorithm to find sets of dominant vertices,
and we test its accuracy on three families of theoretical examples. Then, by
using the same algorithm, we study the relation between the structure of the
underlying network and the corresponding dominant set of vertices. We also
present a result concerning the inheritability of the dominance between
strongly connected networks.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 00:43:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Luna",
"Beatriz",
""
],
[
"Ugalde",
"Edgardo",
""
]
] |
0708.0596 | Christopher Beem | Mina Aganagic, Christopher Beem, Ben Freivogel | Geometric Metastability, Quivers and Holography | v2: 56 pages, 4 figures, harvmac, abstract corrected | Nucl.Phys.B795:291-333,2008 | 10.1016/j.nuclphysb.2007.11.031 | null | hep-th | null | We use large N duality to study brane/anti-brane configurations on a class of
Calabi-Yau manifolds. With only branes present, the Calabi-Yau manifolds in
question give rise to N=2 ADE quiver theories deformed by superpotential terms.
We show that the large N duality conjecture of hep-th/0610249 reproduces
correctly the known qualitative features of the brane/anti-brane physics. In
the supersymmetric case, the gauge theories have Seiberg dualities which are
represented as flops in the geometry. Moreover, the holographic dual geometry
encodes the whole RG flow of the gauge theory. In the non-supersymmetric case,
the large N duality predicts that the brane/anti-brane theories also enjoy such
dualities, and allows one to pick out the good description at a given energy
scale.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 15:31:23 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Sep 2007 18:34:23 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aganagic",
"Mina",
""
],
[
"Beem",
"Christopher",
""
],
[
"Freivogel",
"Ben",
""
]
] |
0708.0597 | Yaroslav Tserkovnyak | Arne Brataas, A. G. Mal'shukov, and Yaroslav Tserkovnyak | Spin Injection in Quantum Wells with Spatially Dependent Rashba
Interaction | 7 pages, 1 figure | null | 10.1088/1367-2630/9/9/345 | null | cond-mat.mes-hall | null | We consider Rashba spin-orbit effects on spin transport driven by an electric
field in semiconductor quantum wells. We derive spin diffusion equations that
are valid when the mean free path and the Rashba spin-orbit interaction vary on
length scales larger than the mean free path in the weak spin-orbit coupling
limit. From these general diffusion equations, we derive boundary conditions
between regions of different spin-orbit couplings. We show that spin injection
is feasible when the electric field is perpendicular to the boundary between
two regions. When the electric field is parallel to the boundary, spin
injection only occurs when the mean free path changes within the boundary, in
agreement with the recent work by Tserkovnyak et al. [cond-mat/0610190].
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 02:07:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brataas",
"Arne",
""
],
[
"Mal'shukov",
"A. G.",
""
],
[
"Tserkovnyak",
"Yaroslav",
""
]
] |
0708.0598 | Matthew McCool Dr | Matthew McCool | An Application of Chromatic Prototypes | This paper has been withdrawn | null | null | null | cs.HC cs.MM | null | This paper has been withdrawn.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 02:38:19 GMT"
},
{
"version": "v2",
"created": "Sun, 3 Feb 2008 19:41:44 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"McCool",
"Matthew",
""
]
] |
0708.0599 | David Harrington | J. R. Kuhn, S. V. Berdyugina, D. M. Fluri, D. M. Harrington and J.O.
Stenflo | A New Mechanism for Polarizing Light from Obscured Stars | Submitted to ApJ Letters | null | 10.1086/522425 | IfA-07-128 | astro-ph | null | Recent spectropolarimetric observations of Herbig AeBe stellar systems show
linear polarization variability with wavelength and epoch near their obscured
H-alpha emission. Surprisingly, this polarization is not coincident with the
H-alpha emission peak but is variable near the absorptive part of the line
profile. With a new and novel model we show here that this is evidence of
optical pumping - anisotropy of the incident radiation that leads to a linear
polarization-dependent optical depth within the intervening hydrogen wind or
disk cloud. This effect can yield a larger polarization signal than scattering
polarization in these systems.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 02:41:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kuhn",
"J. R.",
""
],
[
"Berdyugina",
"S. V.",
""
],
[
"Fluri",
"D. M.",
""
],
[
"Harrington",
"D. M.",
""
],
[
"Stenflo",
"J. O.",
""
]
] |
0708.0600 | Michael Lee | Michael J. Lee | Complementary algorithms for graphs and percolation | 5 pages, 3 figures, poster version presented at statphys23 (2007) | null | 10.1103/PhysRevE.76.027702 | null | cs.DS | null | A pair of complementary algorithms are presented. One of the pair is a fast
method for connecting graphs with an edge. The other is a fast method for
removing edges from a graph. Both algorithms employ the same tree based graph
representation and so, in concert, can arbitrarily modify any graph. Since the
clusters of a percolation model may be described as simple connected graphs, an
efficient Monte Carlo scheme can be constructed that uses the algorithms to
sweep the occupation probability back and forth between two turning points.
This approach concentrates computational sampling time within a region of
interest. A high precision value of pc = 0.59274603(9) was thus obtained, by
Mersenne twister, for the two dimensional square site percolation threshold.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 02:56:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lee",
"Michael J.",
""
]
] |
0708.0601 | David Harrington | D. M. Harrington and J. R. Kuhn | Spectropolarimetry of the H-alpha line in Herbig Ae/Be stars | Accepted for publication in ApJ Letters | null | 10.1086/521999 | IfA-07-130 | astro-ph | null | Using the HiVIS spectropolarimeter built for the Haleakala 3.7m AEOS
telescope, we have obtained a large number of high precision spectropolarimetrc
observations (284) of Herbig AeBe stars collected over 53 nights totaling more
than 300 hours of observing. Our sample of five HAeBe stars: AB Aurigae,
MWC480, MWC120, MWC158 and HD58647, all show systematic variations in the
linear polarization amplitude and direction as a function of time and
wavelength near the H-alpha line. In all our stars, the H-alpha line profiles
show evidence of an intervening disk or outflowing wind, evidenced by strong
emission with an absorptive component. The linear polarization varies by 0.2%
to 1.5% with the change typically centered in the absorptive part of the line
profile. These observations are inconsistent with a simple disk-scattering
model or a depolarization model which produce polarization changes centered on
the emmissive core. We speculate that polarized absorption via optical pumping
of the intervening gas may be the cause.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 02:56:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Harrington",
"D. M.",
""
],
[
"Kuhn",
"J. R.",
""
]
] |
0708.0602 | Urjit A. Yajnik | Urjit A. Yajnik | Gauged B-L unification and cosmology | 6 pages. Talk given at IWTHEP 2007, IIT Roorkee | AIPConf.Proc.939:79-84,2007 | 10.1063/1.2803790 | null | hep-ph | null | We discuss some cosmological implications of low energy gauged B-L symmetry
with and without supersymmetry. Generic possibility of leptogenesis from a
domain wall driven first order phase transition is shown to be a characteristic
of such models.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 03:25:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yajnik",
"Urjit A.",
""
]
] |
0708.0603 | L.T. Handoko | Z. Akbar, Slamet, B. I. Ajinagoro, G.I. Ohara, I. Firmansyah, B.
Hermanto and L.T. Handoko | Public Cluster : parallel machine with multi-block approach | 4 pages, Proceeding of the International Conference on Electrical
Engineering and Informatics 2007 | null | null | FISIKALIPI-07002 | cs.DC cs.CY | null | We introduce a new approach to enable an open and public parallel machine
which is accessible for multi users with multi jobs belong to different blocks
running at the same time. The concept is required especially for parallel
machines which are dedicated for public use as implemented at the LIPI Public
Cluster. We have deployed the simplest technique by running multi daemons of
parallel processing engine with different configuration files specified for
each user assigned to access the system, and also developed an integrated
system to fully control and monitor the whole system over web. A brief
performance analysis is also given for Message Parsing Interface (MPI) engine.
It is shown that the proposed approach is quite reliable and affect the whole
performances only slightly.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 05:18:21 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Akbar",
"Z.",
""
],
[
"Slamet",
"",
""
],
[
"Ajinagoro",
"B. I.",
""
],
[
"Ohara",
"G. I.",
""
],
[
"Firmansyah",
"I.",
""
],
[
"Hermanto",
"B.",
""
],
[
"Handoko",
"L. T.",
""
]
] |
0708.0604 | L.T. Handoko | T.B. Waluyo and L.T. Handoko | Introducing OPTO : Portal for Optical Communities in Indonesia | 3 pages, Proceeding of the 2nd International Conf. on Optics and
Laser Applications 2007 | null | null | FISIKALIPI-07006 | cs.CY | null | Since January 1, 2005 we have launched "OPTO" Portal, a website dedicated to
optical communities in Indonesia. The address of this portal is
http://www.opto.lipi.go.id and is self-supporting managed and not for
commercial purposes. Our aims in launching this portal are to benefit Internet
facility in increasing the communities' scientific activity; to provide an
online reference in Indonesian language for optics-based science and technology
subjects; as well as to pioneer the communities' online activities with real
impacts and benefits for our society. We will describe in the paper the
features of this portal that can be utilized by all individuals or members of
optical communities to store and share information and to build networks or
partnership as well. We realized that this portal is still not popular and most
of our aims are still not reached. This conference should be a good place for
all of us to collaborate to properly utilize this portal for the advantages to
the optical communities in Indonesia and our society at large.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 05:16:10 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Waluyo",
"T. B.",
""
],
[
"Handoko",
"L. T.",
""
]
] |
0708.0605 | L.T. Handoko | Z. Akbar, Slamet, B. I. Ajinagoro, G.I. Ohara, I. Firmansyah, B.
Hermanto and L.T. Handoko | Open and Free Cluster for Public | 4 pages, Proceeding of the International Conference on Rural
Information and Communication Technology 2007 | null | null | FISIKALIPI-07003 | cs.DC cs.CY | null | We introduce the LIPI Public Cluster, the first parallel machine facility
fully open for public and for free in Indonesia and surrounding countries. In
this paper, we focus on explaining our globally new concept on open cluster,
and how to realize and manage it to meet the users needs. We show that after 2
years trial running and several upgradings, the Public Cluster performs well
and is able to fulfil all requirements as expected.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 05:17:34 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Akbar",
"Z.",
""
],
[
"Slamet",
"",
""
],
[
"Ajinagoro",
"B. I.",
""
],
[
"Ohara",
"G. I.",
""
],
[
"Firmansyah",
"I.",
""
],
[
"Hermanto",
"B.",
""
],
[
"Handoko",
"L. T.",
""
]
] |
0708.0606 | Takahiro Omi | Takahiro Omi and Shigeru Shinomoto | Reverberating activity in a neural network with distributed signal
transmission delays | 8pages, 9figures | PHYSICAL REVIEW E 76, 051908 (2007) | 10.1103/PhysRevE.76.051908 | null | cond-mat.dis-nn | null | It is known that an identical delay in all transmission lines can destabilize
macroscopic stationarity of a neural network, causing oscillation or chaos. We
analyze the collective dynamics of a network whose intra-transmission delays
are distributed in time. Here, a neuron is modeled as a discrete-time threshold
element that responds in an all-or-nothing manner to a linear sum of signals
that arrive after delays assigned to individual transmission lines. Even though
transmission delays are distributed in time, a whole network exhibits a single
collective oscillation with a period close to the average transmission delay.
The collective oscillation can not only be a simple alternation of the
consecutive firing and resting, but also nontrivially sequenced series of
firing and resting, reverberating in a certain period of time. Moreover, the
system dynamics can be made quasiperiodic or chaotic by changing the
distribution of delays.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 09:32:01 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Omi",
"Takahiro",
""
],
[
"Shinomoto",
"Shigeru",
""
]
] |
0708.0607 | L.T. Handoko | I. Firmansyah, B. Hermanto, Hadiyanto and L.T. Handoko | Real-time control and monitoring system for LIPI's Public Cluster | 4 pages, Proceeding of the International Conference on
Instrumentation, Communication and Information Technology 2007 | null | null | FISIKALIPI-07004 | cs.DC cs.RO | null | We have developed a monitoring and control system for LIPI's Public Cluster.
The system consists of microcontrollers and full web-based user interfaces for
daily operation. It is argued that, due to its special natures, the cluster
requires fully dedicated and self developed control and monitoring system. We
discuss the implementation of using parallel port and dedicated
micro-controller for this purpose. We also show that integrating such systems
enables an autonomous control system based on the real time monitoring, for
instance an autonomous power supply control based on the actual temperature,
etc.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 05:16:43 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Firmansyah",
"I.",
""
],
[
"Hermanto",
"B.",
""
],
[
"Hadiyanto",
"",
""
],
[
"Handoko",
"L. T.",
""
]
] |
0708.0608 | L.T. Handoko | Z. Akbar and L.T. Handoko | Resource Allocation in Public Cluster with Extended Optimization
Algorithm | 4 pages, Proceeding of the International Conference on
Instrumentation, Communication and Information Technology 2007 | null | null | FISIKALIPI-07005 | cs.DC | null | We introduce an optimization algorithm for resource allocation in the LIPI
Public Cluster to optimize its usage according to incoming requests from users.
The tool is an extended and modified genetic algorithm developed to match
specific natures of public cluster. We present a detail analysis of
optimization, and compare the results with the exact calculation. We show that
it would be very useful and could realize an automatic decision making system
for public clusters.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 05:15:05 GMT"
},
{
"version": "v2",
"created": "Thu, 9 Aug 2007 00:36:19 GMT"
}
] | 2007-08-09T00:00:00 | [
[
"Akbar",
"Z.",
""
],
[
"Handoko",
"L. T.",
""
]
] |
0708.0609 | Christopher Herzog | C. P. Herzog, A. Vuorinen | Spinning Dragging Strings | 25 pages, 4 figures; v2 refs added; v3 to appear in JHEP, clarifying
comments | JHEP0710:087,2007 | 10.1088/1126-6708/2007/10/087 | null | hep-th | null | We use the AdS/CFT correspondence to compute the drag force experienced by a
heavy quark moving through a maximally supersymmetric SU(N) super Yang-Mills
plasma at nonzero temperature and R-charge chemical potential and at large 't
Hooft coupling. We resolve a discrepancy in the literature between two earlier
studies of such quarks. In addition, we consider small fluctuations of the
spinning strings dual to these probe quarks and find no evidence of
instabilities. We make some comments about suitable D7-brane boundary
conditions for the dual strings.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:49:40 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Aug 2007 04:05:06 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Oct 2007 15:48:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Herzog",
"C. P.",
""
],
[
"Vuorinen",
"A.",
""
]
] |
0708.0610 | Yvan Castin | Mattia Jona-Lasinio (LKB - Lhomond, LENS), Ludovic Pricoupenko
(LPTMC), Yvan Castin (LKB - Lhomond) | Three fully polarized fermions close to a p-wave Feshbach resonance | 31 pages, 12 figures | Physical Review A: Atomic, Molecular and Optical Physics 77 (2008)
043611 | 10.1103/PhysRevA.77.043611 | null | cond-mat.other | null | We study the three-body problem for three atomic fermions, in the same spin
state, experiencing a resonant interaction in the p-wave channel via a Feshbach
resonance represented by a two-channel model. The rate of inelastic processes
due to recombination to deeply bound dimers is then estimated from the
three-body solution using a simple prescription. We obtain numerical and
analytical predictions for most of the experimentally relevant quantities that
can be extracted from the three-body solution: the existence of weakly bound
trimers and their lifetime, the low-energy elastic and inelastic scattering
properties of an atom on a weakly bound dimer (including the atom-dimer
scattering length and scattering volume), and the recombination rates for three
colliding atoms towards weakly bound and deeply bound dimers. The effect of
"background" non-resonant interactions in the open channel of the two-channel
model is also calculated and allows to determine which three-body quantities
are `universal' and which on the contrary depend on the details of the model.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 05:57:57 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Apr 2008 08:31:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jona-Lasinio",
"Mattia",
"",
"LKB - Lhomond, LENS"
],
[
"Pricoupenko",
"Ludovic",
"",
"LPTMC"
],
[
"Castin",
"Yvan",
"",
"LKB - Lhomond"
]
] |
0708.0611 | Tobias Kippenberg Jan | P. Del Haye, A. Schliesser, O. Arcizet, T. Wilkins, R. Holzwarth, T.J.
Kippenberg | Optical frequency comb generation from a monolithic microresonator | Manuscript and Supplementary Information | Nature 450, 1214-1217, 2007 | 10.1038/nature06401 | null | physics.optics physics.atm-clus | null | Optical frequency combs provide equidistant frequency markers in the
infrared, visible and ultra-violet and can link an unknown optical frequency to
a radio or microwave frequency reference. Since their inception frequency combs
have triggered major advances in optical frequency metrology and precision
measurements and in applications such as broadband laser-based gas sensing8 and
molecular fingerprinting. Early work generated frequency combs by intra-cavity
phase modulation while to date frequency combs are generated utilizing the
comb-like mode structure of mode-locked lasers, whose repetition rate and
carrier envelope phase can be stabilized. Here, we report an entirely novel
approach in which equally spaced frequency markers are generated from a
continuous wave (CW) pump laser of a known frequency interacting with the modes
of a monolithic high-Q microresonator13 via the Kerr nonlinearity. The
intrinsically broadband nature of parametric gain enables the generation of
discrete comb modes over a 500 nm wide span (ca. 70 THz) around 1550 nm without
relying on any external spectral broadening. Optical-heterodyne-based
measurements reveal that cascaded parametric interactions give rise to an
optical frequency comb, overcoming passive cavity dispersion. The uniformity of
the mode spacing has been verified to within a relative experimental precision
of 7.3*10(-18).
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 07:16:33 GMT"
}
] | 2014-05-28T00:00:00 | [
[
"Del Haye",
"P.",
""
],
[
"Schliesser",
"A.",
""
],
[
"Arcizet",
"O.",
""
],
[
"Wilkins",
"T.",
""
],
[
"Holzwarth",
"R.",
""
],
[
"Kippenberg",
"T. J.",
""
]
] |
0708.0612 | Yong Chen | Yong Chen, Shao-Meng Qin, Lianchun Yu, and Shengli Zhang | Emergence of synchronization induced by the interplay between two
prisoner's dilemma games with volunteering in small-world networks | 6 pages, 4 figures | Phys. Rev. E 77, 032103 (2008) | 10.1103/PhysRevE.77.032103 | null | physics.soc-ph | null | We studied synchronization between prisoner's dilemma games with voluntary
participation in two Newman-Watts small-world networks. It was found that there
are three kinds of synchronization: partial phase synchronization, total phase
synchronization and complete synchronization, for varied coupling factors.
Besides, two games can reach complete synchronization for the large enough
coupling factor. We also discussed the effect of coupling factor on the
amplitude of oscillation of $cooperator$ density.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 07:27:31 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Mar 2008 01:01:44 GMT"
}
] | 2008-03-26T00:00:00 | [
[
"Chen",
"Yong",
""
],
[
"Qin",
"Shao-Meng",
""
],
[
"Yu",
"Lianchun",
""
],
[
"Zhang",
"Shengli",
""
]
] |
0708.0613 | Devendra Ojha K | D.K. Ojha, A. Tej, M. Schultheis, A. Omont, F. Schuller | High mass-loss AGB stars detected by MSX in the "intermediate" and
"outer" Galactic bulge | 18 pages, 18 figures: Accepted for the publication in MNRAS; Full
resolution figures available at
http://www.tifr.res.in/~ojha/bulge_mass-loss.ps | null | null | null | astro-ph | null | We present a study of MSX point sources in the Galactic bulge (|l| < 3 deg, 1
deg < |b| < 5 deg), observed at A, C, D and E-band (8 to 21 micron), with a
total area ~ 48 deg^2. We discuss the nature of the MSX sources (mostly AGB
stars), their luminosities, the interstellar extinction, the mass-loss rate
distribution and the total mass-loss rate in the bulge. The MIR data of MSX
point sources have been combined with the NIR (J, H and Ks) data of 2MASS
survey. The cross-identification was restricted to Ks-band detected sources
with Ks <= 11 mag. However, for those bright MSX D-band sources ([D] < 4.0
mag), which do not satisfy this criteria, we have set no Ks-band magnitude cut
off. The relation between Mdot and (Ks-[15])0 was used to derive the mass-loss
rate of each MSX source in the bulge fields. Except for very few post-AGB
stars, PNe and OH/IR stars, a large fraction of the detected sources at 15
micron (MSX D-band) are AGB stars well above the RGB tip. A number of them show
an excess in ([A]-[D])0 and (Ks-[D])0 colours, characteristic of mass-loss.
These colours, especially (Ks-[D])0, enable estimation of the mass-loss rates
(Mdot) of the sources in the bulge fields which range from 10^{-7} to 10^{-4}
Msun/yr. Taking into consideration the completeness of the mass-loss rate bins,
we find that the contribution to the integrated mass-loss is probably dominated
by mass-loss rates larger than 3x10^{-7} Msun/yr and is about 1.96 x 10^{-4}
Msun/yr/deg^2 in the "intermediate" and "outer" bulge fields of sources with
mass-loss rates, Mdot > 3x10^{-7} Msun/yr. The corresponding integrated
mass-loss rate per unit stellar mass is 0.48x10^{-11} yr^{-1}. Apart from this,
the various MIR and NIR CC and CM diagrams are discussed in the paper to study
the nature of the stellar population in the MSX bulge fields.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 07:50:26 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Ojha",
"D. K.",
""
],
[
"Tej",
"A.",
""
],
[
"Schultheis",
"M.",
""
],
[
"Omont",
"A.",
""
],
[
"Schuller",
"F.",
""
]
] |
0708.0614 | Lancelot F. James | Lancelot F. James | New Dirichlet Mean Identities | Section 5 has been added | null | null | null | math.PR math.ST stat.TH | null | An important line of research is the investigation of the laws of random
variables known as Dirichlet means as discussed in Cifarelli and
Regazzini(1990). However there is not much information on inter-relationships
between different Dirichlet means. Here we introduce two distributional
operations, which consist of multiplying a mean functional by an independent
beta random variable and an operation involving an exponential change of
measure. These operations identify relationships between different means and
their densities. This allows one to use the often considerable analytic work to
obtain results for one Dirichlet mean to obtain results for an entire family of
otherwise seemingly unrelated Dirichlet means. Additionally, it allows one to
obtain explicit densities for the related class of random variables that have
generalized gamma convolution distributions, and the finite-dimensional
distribution of their associated L\'evy processes. This has implications in,
for instance, the explicit description of Bayesian nonparametric prior and
posterior models, and more generally in a variety of applications in
probability and statistics involving Levy processes.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 08:11:31 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Aug 2007 06:08:58 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"James",
"Lancelot F.",
""
]
] |
0708.0615 | Milorad Stupar MS | M. Stupar, Q. A. Parker, M. D. Filipovic, D. J. Frew, I. Bojicic, B.
Aschenbach | Multi-wavelength study of a new Galactic SNR G332.5-5.6 | 14 pages, 18 figures. Accepted for publishing in the MNRAS | null | 10.1111/j.1365-2966.2007.12296.x | null | astro-ph | null | We present compelling evidence for confirmation of a Galactic supernova
remnant (SNR) candidate, G332.5-5.6, based initially on identification of new,
filamentary, optical emission line nebulosity seen in the arcsecond resolution
images from the AAO/UKST HAlpha survey. The extant radio observations and X-ray
data which we have independently re-reduced, together with new optical
spectroscopy of the large-scale fragmented nebulosity, confirms the
identification. Optical spectra, taken across five different, widely separated
nebula regions of the remnant as seen on the HAlpha images, show average ratios
of [NII]/HAlpha =2.42, [SII]/HAlpha = 2.10, and [SII] 6717/6731 = 1.23, as well
as strong [OI] 6300, 6364A and [OII] 3727A emission. These ratios are firmly
within those typical of SNRs. Here, we also present the radio-continuum
detection of the SNR at 20/13cm from observations with the Australia Telescope
Compact Array (ATCA). Radio emission is also seen at 4850 MHz, in the PMN
survey (Griffith and Wright 1993) and at 843 MHz from the SUMSS survey (Bock,
Large and Sadler 1999). We estimate an angular diameter of ~30 arcmin and
obtain an average radio spectral index of alpha = -0.6 +- 0.1 which indicates
the non-thermal nature of G332.5-5.6. Fresh analysis of existing ROSAT X-ray
data in the vicinity also confirms the existence of the SNR. The distance to
G332.5-5.6 has been independently estimated by Reynoso and Green (2007) as 3.4
kpc based on measurements of the HI lambda21 cm line seen in absorption against
the continuum emission. Our cruder estimates via assumptions on the height of
the dust layer (3.1 kpc) and using the Sigma-D relation (4 kpc) are in good
agreement.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 08:16:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stupar",
"M.",
""
],
[
"Parker",
"Q. A.",
""
],
[
"Filipovic",
"M. D.",
""
],
[
"Frew",
"D. J.",
""
],
[
"Bojicic",
"I.",
""
],
[
"Aschenbach",
"B.",
""
]
] |
0708.0616 | Jacopo De Simoi | Jacopo De Simoi, Stefano Marmi | Potts models on hierarchical lattices and Renormalization Group dynamics | 21 pages, 7 figures; v3 revised, some issues corrected | null | null | null | cond-mat.stat-mech math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the generator of the renormalization group of Potts models on
hierarchical lattices can be represented by a rational map acting on a
finite-dimensional product of complex projective spaces. In this framework we
can also consider models with an applied external magnetic field and
multiple-spin interactions. We use recent results regarding iteration of
rational maps in several complex variables to show that, for some class of
hierarchical lattices, Lee-Yang and Fisher zeros belong to the unstable set of
the renormalization map.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 08:41:06 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Nov 2007 18:13:42 GMT"
},
{
"version": "v3",
"created": "Sun, 3 Aug 2008 19:30:21 GMT"
}
] | 2008-08-03T00:00:00 | [
[
"De Simoi",
"Jacopo",
""
],
[
"Marmi",
"Stefano",
""
]
] |
0708.0617 | Gabriele Ghisellini | G. Ghisellini (1), L. Foschini (2), F. Tavecchio (1), E. Pian (3) ((1)
INAF-Oss. Astr. Brera, (2) INAF-IASF/Bologna, (3)INAF-Oss. Astr.Trieste) | On the July 2007 flare of the blazar 3C 454.3 | 5 pages, 3 figures, MNRAS (Letters) in press (minor revision) | null | 10.1111/j.1745-3933.2007.00397.x | null | astro-ph | null | In July 2007, the blazar 3C 454.3 underwent a flare in the optical, reaching
R~13 on July 19. Then the optical flux decreased by one magnitude, being R~14
when the source was detected by the gamma-ray satellite AGILE, that observed
the source on July 24-30. At the same time, the Swift satellite performed a
series of snapshots. We can construct the simultaneous spectral energy
distribution using optical, UV, X-ray and gamma-ray data. These shows that an
increased gamma-ray flux is accompanied by a weaker optical/X-ray flux with
respect to the flare observed in the Spring 2005 by INTEGRAL and Swift. This
confirms earlier suggestions about the behaviour of the jet of 3C 454.3.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 08:44:42 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Sep 2007 08:55:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ghisellini",
"G.",
""
],
[
"Foschini",
"L.",
""
],
[
"Tavecchio",
"F.",
""
],
[
"Pian",
"E.",
""
]
] |
0708.0618 | Lancelot F. James | Lancelot F. James | Lamperti-type laws | Published in at http://dx.doi.org/10.1214/09-AAP660 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2010, Vol. 20, No. 4, 1303-1340 | 10.1214/09-AAP660 | IMS-AAP-AAP660 | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores various distributional aspects of random variables
defined as the ratio of two independent positive random variables where one
variable has an $\alpha$-stable law, for $0<\alpha<1$, and the other variable
has the law defined by polynomially tilting the density of an $\alpha$-stable
random variable by a factor $\theta>-\alpha$. When $\theta=0$, these variables
equate with the ratio investigated by Lamperti [Trans. Amer. Math. Soc. 88
(1958) 380--387] which, remarkably, was shown to have a simple density. This
variable arises in a variety of areas and gains importance from a close
connection to the stable laws. This rationale, and connection to the
$\operatorname {PD}(\alpha,\theta)$ distribution, motivates the investigations
of its generalizations which we refer to as Lamperti-type laws. We identify and
exploit links to random variables that commonly appear in a variety of
applications. Namely Linnik, generalized Pareto and $z$-distributions. In each
case we obtain new results that are of potential interest. As some highlights,
we then use these results to (i) obtain integral representations and other
identities for a class of generalized Mittag--Leffler functions, (ii) identify
explicitly the L\'{e}vy density of the semigroup of stable continuous state
branching processes (CSBP) and hence corresponding limiting distributions
derived in Slack and in Zolotarev [Z. Wahrsch. Verw. Gebiete 9 (1968) 139--145,
Teor. Veroyatn. Primen. 2 (1957) 256--266], which are related to the recent
work by Berestycki, Berestycki and Schweinsberg, and Bertoin and LeGall [Ann.
Inst. H. Poincar\'{e} Probab. Statist. 44 (2008) 214--238, Illinois J. Math. 50
(2006) 147--181] on beta coalescents. (iii) We obtain explicit results for the
occupation time of generalized Bessel bridges and some interesting stochastic
equations for $\operatorname {PD}(\alpha,\theta)$-bridges. In particular we
obtain the best known results for the density of the time spent positive of a
Bessel bridge of dimension $2-2\alpha$.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 09:17:40 GMT"
},
{
"version": "v2",
"created": "Sun, 4 May 2008 04:26:44 GMT"
},
{
"version": "v3",
"created": "Mon, 31 Aug 2009 00:08:22 GMT"
},
{
"version": "v4",
"created": "Thu, 21 Oct 2010 10:56:51 GMT"
}
] | 2010-10-22T00:00:00 | [
[
"James",
"Lancelot F.",
""
]
] |
0708.0619 | Lancelot F. James | Man-Wai Ho, Lancelot F. James, and John W. Lau | Gibbs Partitions (EPPF's) Derived From a Stable Subordinator are Fox H
and Meijer G Transforms | null | null | null | null | math.PR | null | This paper derives explicit results for the infinite Gibbs partitions
generated by the jumps of an $\alpha-$stable subordinator, derived in Pitman
\cite{Pit02, Pit06}. We first show that for general $\alpha$ the conditional
EPPF can be represented as ratios of Fox-$H$ functions, and in the case of
rational $\alpha,$ Meijer-G functions. Furthermore the results show that the
resulting unconditional EPPF's, can be expressed in terms of H and G transforms
indexed by a function h. Hence when h is itself a H or G function the EPPF is
also an H or G function. An implication, in the case of rational $\alpha,$ is
that one can compute explicitly thousands of EPPF's derived from possibly
exotic special functions. This would also apply to all $\alpha$ except that
computations for general Fox functions are not yet available. However, moving
away from special functions, we demonstrate how results from probability theory
may be used to obtain calculations. We show that a forward recursion can be
applied that only requires calculation of the simplest components. Additionally
we identify general classes of EPPF's where explicit calculations can be
carried out using distribution theory.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 11:34:13 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 10:24:12 GMT"
}
] | 2007-08-29T00:00:00 | [
[
"Ho",
"Man-Wai",
""
],
[
"James",
"Lancelot F.",
""
],
[
"Lau",
"John W.",
""
]
] |
0708.0620 | Fatimah Shojai | F. Shojai, and S. Molladavoudi | Quantum cosmology with varying speed of light and Bohmian trajectories | null | Gen.Rel.Grav.39:795-813,2007 | 10.1007/s10714-007-0421-7 | null | gr-qc | null | The classical trajectories for FLRW universe with varying speed of light are
obtained for the cases in which the cosmological constant depends or not depend
on the velocity of light. The theory is then quantized and the corresponding
WDW equation is solved. It is shown that the method of causal interpretation of
Bohm can be applied successfully to the theory. Finally the Bohmian
trajectories are obtained and compared with the classical ones.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 11:00:05 GMT"
}
] | 2010-01-25T00:00:00 | [
[
"Shojai",
"F.",
""
],
[
"Molladavoudi",
"S.",
""
]
] |
0708.0621 | Fatimah Shojai | Ali Shojai, and Fatimah Shojai | Causal loop quantum cosmology in momentum space | 21 pages, 2 figures. To appear in Int. J. Mod. Phys. D, 2008 | Int.J.Mod.Phys.D18:83-93,2009 | 10.1142/S0218271809014339 | null | gr-qc | null | We shall show that it is possible to make a causal interpretation of loop
quantum cosmology using the momentum as the dynamical variable. We shall show
that one can derive Bohmian trajectories. For a sample cosmological solution
with cosmological constant, the trajectory is plotted.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 11:04:03 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Apr 2008 03:02:00 GMT"
}
] | 2009-03-24T00:00:00 | [
[
"Shojai",
"Ali",
""
],
[
"Shojai",
"Fatimah",
""
]
] |
0708.0622 | Carsten Denker | A. P. Verdoni (1), C. Denker (1,2), J. R. Varsik (3), S. Shumko (3),
J. Nenow (3), and R. Coulter (3) ((1) New Jersey Institute of Technology,
Newark, U.S.A., (2) Astrophysikalisches Institut Potsdam, Germany, and (3)
Big Bear Solar Observatory, Big Bear City, U.S.A.) | The Thermal Environment of the Fiber Glass Dome for the New Solar
Telescope at Big Bear Solar Observatory | 12 pages, 11 figures, submitted to SPIE Optics+Photonics, San Diego,
U.S.A., 26-30 August 2007, Conference: Solar Physics and Space Weather
Instrumentation II, Proceedings of SPIE Volume 6689, Paper #29 | null | 10.1117/12.734948 | null | astro-ph | null | The New Solar Telescope (NST) is a 1.6-meter off-axis Gregory-type telescope
with an equatorial mount and an open optical support structure. To mitigate the
temperature fluctuations along the exposed optical path, the effects of
local/dome-related seeing have to be minimized. To accomplish this, NST will be
housed in a 5/8-sphere fiberglass dome that is outfitted with 14 active vents
evenly spaced around its perimeter. The 14 vents house louvers that open and
close independently of one another to regulate and direct the passage of air
through the dome. In January 2006, 16 thermal probes were installed throughout
the dome and the temperature distribution was measured. The measurements
confirmed the existence of a strong thermal gradient on the order of 5 degree
Celsius inside the dome. In December 2006, a second set of temperature
measurements were made using different louver configurations. In this study, we
present the results of these measurements along with their integration into the
thermal control system (ThCS) and the overall telescope control system (TCS).
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 11:29:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Verdoni",
"A. P.",
""
],
[
"Denker",
"C.",
""
],
[
"Varsik",
"J. R.",
""
],
[
"Shumko",
"S.",
""
],
[
"Nenow",
"J.",
""
],
[
"Coulter",
"R.",
""
]
] |
0708.0623 | Roland Bastardis | Roland Bastardis, Coen de Graaf, Nathalie Guihery | Ab initio study of the CE magnetic phase in half-doped manganites:
Purely magnetic versus double exchange description | null | null | 10.1103/PhysRevB.77.054426 | null | cond-mat.str-el | null | The leading electronic interactions governing the local physics of the CE
phase of half-doped manganites are extracted from correlated ab initio
calculations performed on an embedded cluster. The electronic structure of the
low-energy states is dominated by double exchange configurations and
O-2$p_{\sigma}$ to Mn-3d charge transfer configurations. The model spectra of
both a purely magnetic non-symmetric Heisenberg Hamiltonian involving a
magnetic oxygen and two non-symmetric double exchange models are compared to
the \textit{ab initio} one. While a satisfactory agreement between the
Heisenberg spectrum and the calculated one is obtained, the best description is
provided by a double exchange model involving excited non-Hund atomic states.
This refined model not only perfectly reproduces the spectrum of the embedded
cluster in the crystal geometry, but also gives a full description of the local
double-well potential energy curve of the ground state (resulting from the
interaction of the charge localized electronic configurations) and the local
potential energy curves of all excited states ruled by the double exchange
mechanism.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 11:39:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bastardis",
"Roland",
""
],
[
"de Graaf",
"Coen",
""
],
[
"Guihery",
"Nathalie",
""
]
] |
0708.0624 | Matthias Brust R. | Christian Hutter, Matthias R. Brust, Steffen Rothkugel | ADS-Directory Services for Mobile Ad-Hoc Networks Based on an
Information Market Model | 9 pages, in the 1st International Workshop on Ubiquitous Computing
(IWUC-2004) held in conjunction with the 6th International Conference on
Enterprise Information Systems (ICEIS 2004) | null | null | null | cs.NI cs.DC | null | Ubiquitous computing based on small mobile devices using wireless
communication links is becoming very attractive. The computational power and
storage capacities provided allow the execution of sophisticated applications.
Due to the fact that sharing of information is a central problem for
distributed applications, the development of self organizing middleware
services providing high level interfaces for information managing is essential.
ADS is a directory service for mobile ad-hoc networks dealing with local and
nearby information as well as providing access to distant information. The
approach discussed throughout this paper is based upon the concept of
information markets.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 13:21:55 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Hutter",
"Christian",
""
],
[
"Brust",
"Matthias R.",
""
],
[
"Rothkugel",
"Steffen",
""
]
] |
0708.0625 | Ning Bo Zhao | Ning Bo Zhao, An Min Wang | Hybrid protocol of remote implementations of quantum operations | 9 pages, 1 figure | null | 10.1103/PhysRevA.76.062317 | null | quant-ph | null | We propose a protocol of remote implementations of quantum operations by
hybridizing bidirectional quantum state teleportation's (BQST) and Wang's one.
The protocol is available for remote implemetations of quantum operations in
the restricted sets specified in Sec. III. We also give the proof of the
protocol and point out its optimization. As an extension, this hybrid protocol
can be reduced to BQST and Wang protocols.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 12:14:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhao",
"Ning Bo",
""
],
[
"Wang",
"An Min",
""
]
] |
0708.0626 | Alexei Moiseev | T.A. Lozinskaya (1), A.V. Moiseev (2) ((1) Sternberg Astronomical
Institute, Russia, (2) Special Astrophysical Observatory, Russia) | A synchrotron superbubble in the IC 10 Galaxy: a hypernova remnant? | 4 pages, 3 EPS figures, Accepted to MNRAS (in Letters) | null | 10.1111/j.1745-3933.2007.00359.x | null | astro-ph | null | The nature of the synchrotron superbubble in the IC 10 galaxy is discussed
using the results of our investigation of its ionized gas structure,
kinematics, and emission spectrum from observations made with the 6-m telescope
of the Special Astrophysical Observatory of the Russian Academy of Sciences,
and based on our analysis of the radio emission of the region. The hypernova
explosion is shown to be a more plausible mechanism of the formation of the
synchrotron superbubble compared with the earlier proposed model of multiple
supernova explosions. A compact remnant of this hypernova may be identified
with the well known X-ray binary X-1 -- an accreting black hole.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 12:24:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lozinskaya",
"T. A.",
""
],
[
"Moiseev",
"A. V.",
""
]
] |
0708.0627 | Matthias Brust R. | Matthias R. Brust, Daniel Goergen, Christian Hutter, Steffen Rothkugel | ADS as Information Management Service in an M-Learning Environment | 8th International Conference on Knowledge-Based Intelligent
Information & Engineering Systems (KES2004) | null | null | null | cs.NI cs.DC | null | Leveraging the potential power of even small handheld devices able to
communicate wirelessly requires dedicated support. In particular, collaborative
applications need sophisticated assistance in terms of querying and exchanging
different kinds of data. Using a concrete example from the domain of mobile
learning, the general need for information dissemination is motivated.
Subsequently, and driven by infrastructural conditions, realization strategies
of an appropriate middleware service are discussed.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 13:32:07 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Brust",
"Matthias R.",
""
],
[
"Goergen",
"Daniel",
""
],
[
"Hutter",
"Christian",
""
],
[
"Rothkugel",
"Steffen",
""
]
] |
0708.0628 | Jonathan R. Gair | Jonathan R Gair, Chao Li, Ilya Mandel | Observable Properties of Orbits in Exact Bumpy Spacetimes | 42 pages, 20 figures, accepted by Phys. Rev. D, v2 has minor changes
to make it consistent with published version | Phys.Rev.D77:024035,2008 | 10.1103/PhysRevD.77.024035 | null | gr-qc | null | We explore the properties of test-particle orbits in "bumpy" spacetimes -
stationary, reflection-symmetric, asymptotically flat solutions of Einstein
equations that have a non-Kerr (anomalous) higher-order multipole-moment
structure but can be tuned arbitrarily close to the Kerr metric. Future
detectors should observe gravitational waves generated during inspirals of
compact objects into supermassive central bodies. If the central body deviates
from the Kerr metric, this will manifest itself in the emitted waves. Here, we
explore some of the features of orbits in non-Kerr spacetimes that might lead
to observable signatures. As a basis for this analysis, we use a family of
exact solutions proposed by Manko & Novikov which deviate from the Kerr metric
in the quadrupole and higher moments, but we also compare our results to other
work in the literature. We examine isolating integrals of the orbits and find
that the majority of geodesic orbits have an approximate fourth constant of the
motion (in addition to the energy, angular momentum and rest mass) and the
resulting orbits are tri-periodic to high precision. We also find that this
fourth integral can be lost for certain orbits in some oblately deformed
Manko-Novikov spacetimes. However, compact objects will probably not end up on
these chaotic orbits in nature. We compute the location of the innermost stable
circular orbit (ISCO) and find that the behavior of orbtis near the ISCO can be
qualitatively different depending on whether the ISCO is determined by the
onset of an instability in the radial or vertical direction. Finally, we
compute periapsis and orbital-plane precessions for nearly circular and nearly
equatorial orbits in both the strong and weak field, and discuss weak-field
precessions for eccentric equatorial orbits.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 13:48:04 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Jan 2008 12:26:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gair",
"Jonathan R",
""
],
[
"Li",
"Chao",
""
],
[
"Mandel",
"Ilya",
""
]
] |
0708.0629 | Alberto Supanitsky Mr | A. D. Supanitsky (1), J. C. D'Olivo (1), and G. A. Medina-Tanco (1)
((1) Departamento de F\'isica de Altas Energ\'as, Instituto de Ciencias
Nucleares, Universidad Nacional Aut\'onoma de M\'exico, M\'exico.) | Analytical description of the Day-Night neutrino asymmetry | 4 pages and 4 figures. Contribution to the 30th International Cosmic
Ray Conference, Merida, Mexico, July 2007 | null | null | null | astro-ph | null | We present a new treatment of the Earth matter effects on the neutrino
oscillations that is valid for an arbitrary density profile. When applied to
the the study of the day-night effect on the solar neutrino flux it renders us
a simple analytical expression, which is more accurate than those derived by
using the perturbation theory and can be extended to higher energies.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 13:54:37 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Sep 2007 20:23:25 GMT"
}
] | 2007-09-06T00:00:00 | [
[
"Supanitsky",
"A. D.",
""
],
[
"D'Olivo",
"J. C.",
""
],
[
"Medina-Tanco",
"G. A.",
""
]
] |
0708.0630 | Ivan Losev | Ivan V. Losev | Lifting central invariants of quantized Hamiltonian actions | v1 9 pages, v2 final version 10 pages | Moscow Math. J., 9(2009), N2, 359-369 | null | null | math.QA math.SG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let G be a connected reductive group over an algebraically closed field K of
characteristic 0, X an affine symplectic variety equipped with a Hamiltonian
action of G. Further, let * be a G-invariant Fedosov star-product on X such
that the Hamiltonian action is quantized. We establish an isomorphism between
the center of the associative algebra K[X][[h]]^G and the algebra of formal
power series with coefficients in the Poisson center of K[X]^G.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 13:58:19 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Sep 2009 01:30:26 GMT"
}
] | 2009-09-14T00:00:00 | [
[
"Losev",
"Ivan V.",
""
]
] |
0708.0631 | Yue Yu | Yue Yu, Ziqiang Wang | An exactly soluble model with tunable p-wave paired fermion ground
states | 6 pages, 2 figures, published version | Europhys. Lett. 84, 57002 (2008) | 10.1209/0295-5075/84/57002 | null | cond-mat.str-el cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the work of Kitaev, we construct an exactly soluble
spin-$\frac{1}2$ model on honeycomb lattice whose ground states are identical
to $\Delta_{1x}p_x+\Delta_{1y}p_y+i(\Delta_{2x}p_x+\Delta_{2y}p_y)$-wave paired
fermions on square lattice, with tunable paring order parameters. We derive a
universal phase diagram for this general p-wave theory which contains a gapped
A phase and a topologically non-trivial B phase. We show that the gapless
condition in the B phase is governed by a generalized inversion (G-inversion)
symmetry under $p_x\leftrightarrow {\Delta_{1y}\over \Delta_{1x}} p_y$. The
G-inversion symmetric gapless B phase near the phase boundaries is described by
1+1-dimensional gapless Majorana fermions in the asymptotic long wave length
limit, i.e. the $c=1/2$ conformal field theory. The gapped B phase has
G-inversion symmetry breaking and is the weak pairing phase described by the
Moore-Read Pfaffian. We show that in the gapped B phase, vortex pair
excitations are separated from the ground state by a finite energy gap.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 14:49:24 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Sep 2007 01:51:45 GMT"
},
{
"version": "v3",
"created": "Fri, 16 Jan 2009 03:26:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yu",
"Yue",
""
],
[
"Wang",
"Ziqiang",
""
]
] |
0708.0632 | Mikhail Shifman | M. Shifman | Some Theoretical Developments in SUSY | 20 pages. Plenary Talk at the 15th International Conference on
Supersymmetry and the Unification of Fundamental Interactions SUSY 07,
Karlsruhe, Germany, July 26 - August 1, 2007. Submitted for the SUSY07
proceedings | null | null | FTPI-MINN-07/24, UMN-TH-2613/07 | hep-th hep-ph | null | I review theoretical developments of the last year or so in nonperturbative
supersymmetry. Topics: (i) Metastable vacua at strong coupling; (ii)
Non-Abelian flux tubes, confined monopoles; (iii) One step beyond Seiberg's
duality; (iv) Planar equivalence; (v) Multileg/multiloop amplitudes; (vi) N=
(2,0) sigma model on the string worldsheet.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 15:16:52 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Shifman",
"M.",
""
]
] |
0708.0633 | Alexander Lenz | Alexander Lenz | Form factors of baryons within the framework of light-cone sum rules | Talk presented at QCD@work 2007 in Martina Franca, Italy; 7 pages, 10
figures | AIPConf.Proc.964:77-83,2007 | 10.1063/1.2823884 | null | hep-ph | null | We present the application of the method of light-cone sum rules to the
determination of baryonic form factors at intermediate momentum transfer. After
reviewing the current status of this field we give some outlook on possible
future projects.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 15:22:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lenz",
"Alexander",
""
]
] |
0708.0634 | Stefan Papadima | Barbu Berceanu, Stefan Papadima | Universal representations of braid and braid-permutation groups | 19 pages, references added | J. Knot Theory Ramif. 18 (2009), no.7, 999-1019 | null | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Drinfel'd used associators to construct families of universal representations
of braid groups. We consider semi-associators (i.e., we drop the pentagonal
axiom and impose a normalization in degree one). We show that the process may
be reversed, to obtain semi-associators from universal representations of
3-braids. We view braid groups as subgroups of braid-permutation groups. We
construct a family of universal representations of braid-permutation groups,
without using associators. All representations in the family are faithful,
defined over $\bbQ$ by simple explicit formulae. We show that they give
universal Vassiliev-type invariants for braid-permutation groups.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 15:40:33 GMT"
},
{
"version": "v2",
"created": "Sat, 24 Oct 2009 14:46:15 GMT"
}
] | 2009-10-24T00:00:00 | [
[
"Berceanu",
"Barbu",
""
],
[
"Papadima",
"Stefan",
""
]
] |
0708.0635 | Chris Stucchio | O. Costin, J.L. Lebowitz, C. Stucchio and S. Tanveer | Exact Results for Ionization of Model Atomic Systems | null | null | null | null | physics.atom-ph | null | We present rigorous results for quantum systems with both bound and continuum
states subjected to an arbitrary strength time-periodic field. We prove that
the wave function takes the form of a sum of time-periodic resonant states with
complex quasi-energies and dispersive part of the the solution given by a power
series in t^{-1/2}. Generally, the imaginary part of each resonance is
negative, leading to ionization of the atom, but we also give examples where
the ionization rate is zero implying the existence of a time-periodic Floquet
bound state. The complex quasi-energy has a convergent perturbation expansion
for small field strengths.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 16:24:49 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Costin",
"O.",
""
],
[
"Lebowitz",
"J. L.",
""
],
[
"Stucchio",
"C.",
""
],
[
"Tanveer",
"S.",
""
]
] |
0708.0636 | Joaquin Diaz-Alonso | Joaquin Diaz-Alonso, Diego Rubiera-Garcia | Generalized gauge field theories with non-topological soliton solutions | 6 pages, revtex4 | Phys.Lett.B657:257-262,2007 | 10.1016/j.physletb.2007.08.093 | null | hep-th | null | We perform a systematic analysis of the conditions under which
\textit{generalized} gauge field theories of compact semisimple Lie groups
exhibit electrostatic spherically symmetric non-topological soliton solutions
in three space dimensions. By the term \textit{generalized}, we mean that the
dynamics of the concerned fields is governed by lagrangian densities which are
general functions of the quadratic field invariants, leading to physically
consistent models. The analysis defines exhaustively the class of this kind of
lagrangian models supporting those soliton solutions and leads to methods for
their explicit determination. The necessary and sufficient conditions for the
linear stability of the finite-energy solutions against charge-preserving
perturbations are established, going beyond the usual Derrick-like criteria,
which only provides necessary conditions.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 16:37:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Diaz-Alonso",
"Joaquin",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] |
0708.0637 | Nicholas Young | A. A. Abouhajar, M. C. White and N. J. Young | A Schwarz lemma for a domain related to mu-synthesis | 33 pages, 1 figure, This version (v3) contains a correction of
inaccuracies in Theorems 2.2 and 2.4. Three of the eleven equivalent
conditions we gave for membership of the tetrablock were incorrect. The error
does not affect any of the rest of the paper | Journal of Geometric Analysis, Vol. 17, No. 4, December 2007,
pages 717-750 | null | null | math.CV math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a Schwarz lemma for a domain E in 3-dimensional complex space that
arises in connection with a problem in H infinity control theory. We describe a
class of automorphisms of E and determine the distinguished boundary of E. We
obtain a type of Schwarz-Pick lemma for a two by two mu-synthesis problem.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 17:04:51 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 16:49:33 GMT"
},
{
"version": "v3",
"created": "Tue, 12 Mar 2013 18:18:18 GMT"
}
] | 2013-03-13T00:00:00 | [
[
"Abouhajar",
"A. A.",
""
],
[
"White",
"M. C.",
""
],
[
"Young",
"N. J.",
""
]
] |
0708.0638 | Christian Klein | T. Grava, C. Klein | Numerical study of a multiscale expansion of the Korteweg de Vries
equation and Painlev\'e-II equation | 20 pages, 14 figures | Proc. Roy. Soc. A (2008) 464, 733-757 | 10.1098/rspa.2007.0249 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Cauchy problem for the Korteweg de Vries (KdV) equation with small
dispersion of order $\e^2$, $\e\ll 1$, is characterized by the appearance of a
zone of rapid modulated oscillations. These oscillations are approximately
described by the elliptic solution of KdV where the amplitude, wave-number and
frequency are not constant but evolve according to the Whitham equations.
Whereas the difference between the KdV and the asymptotic solution decreases as
$\epsilon$ in the interior of the Whitham oscillatory zone, it is known to be
only of order $\epsilon^{1/3}$ near the leading edge of this zone. To obtain a
more accurate description near the leading edge of the oscillatory zone we
present a multiscale expansion of the solution of KdV in terms of the
Hastings-McLeod solution of the Painlev\'e-II equation. We show numerically
that the resulting multiscale solution approximates the KdV solution, in the
small dispersion limit, to the order $\epsilon^{2/3}$.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 17:33:29 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 10:01:24 GMT"
},
{
"version": "v3",
"created": "Mon, 19 Nov 2007 20:04:00 GMT"
},
{
"version": "v4",
"created": "Wed, 20 Aug 2008 16:14:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Grava",
"T.",
""
],
[
"Klein",
"C.",
""
]
] |
0708.0639 | Levani Chotorlishvili | L. Chotorlishvili, K. Nickoladze, G. Mchedlishvili | Paul Trap and the Problem of Quantum Stability | null | null | null | null | nlin.CD | null | This work is devoted to the investigation of possibility of controlling of
ions motion inside Paul trap. It has been shown that by proper selection of the
parameters of controlling electric fields, stable localization of ions inside
Paul trap is possible. Quantum consideration of this problem is reduced to the
investigation of the Mathieu-Schrodinger equation. It has been shown that
quantum consideration is appreciably different from classical one that leads to
stronger limitations of the values of the parameters of stable motion.
Connection between the problem under study and the possibility of experimental
observation of quantum chaos has been shown.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 17:38:05 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Chotorlishvili",
"L.",
""
],
[
"Nickoladze",
"K.",
""
],
[
"Mchedlishvili",
"G.",
""
]
] |
0708.0640 | Michael P. Tuite | Geoffrey Mason, Michael P. Tuite and Alexander Zuevsky | Torus n-Point Functions for $\mathbb{R}$-graded Vertex Operator
Superalgebras and Continuous Fermion Orbifolds | 50 pages | null | 10.1007/s00220-008-0510-9 | null | math.QA hep-th | null | We consider genus one n-point functions for a vertex operator superalgebra
with a real grading. We compute all n-point functions for rank one and rank two
fermion vertex operator superalgebras. In the rank two fermion case, we obtain
all orbifold n-point functions for a twisted module associated with a
continuous automorphism generated by a Heisenberg bosonic state. The modular
properties of these orbifold n-point functions are given and we describe a
generalization of Fay's trisecant identity for elliptic functions.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 17:53:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mason",
"Geoffrey",
""
],
[
"Tuite",
"Michael P.",
""
],
[
"Zuevsky",
"Alexander",
""
]
] |
0708.0641 | J. T. Londergan | J.T. Londergan and A.P. Szczepaniak | What is Measured in Hard Exclusive Electroproduction? | 6 pages, 2 figures | null | null | null | hep-ph | null | We examine the relation between amplitudes measured in exclusive
lepto-production and the quark content of the nucleon. We show that in the
limit of high energy and small t, the natural interpretation of amplitudes
measured in these hard exclusive processes is in terms of the quark content of
the meson cloud and not the target itself. In this regime, Regge amplitudes
will make a significant contribution to these exclusive amplitudes. This leads
to violation of QCD scaling.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 18:24:39 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Londergan",
"J. T.",
""
],
[
"Szczepaniak",
"A. P.",
""
]
] |
0708.0642 | Ludmila Joukovskaya | L. Joukovskaya | Iterative method for solving nonlinear integral equations describing
rolling solutions in String Theory | 11 pages, 2 figures | Theor.Math.Phys.146:335-342,2006; Teor.Mat.Fiz.146:402-409,2006 | null | null | math-ph hep-th math.MP | null | We consider a nonlinear integral equation with infinitely many derivatives
that appears when a system of interacting open and closed strings is
investigated if the nonlocality in the closed string sector is neglected. We
investigate the properties of this equation, construct an iterative method for
solving it, and prove that the method converges.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 18:40:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Joukovskaya",
"L.",
""
]
] |
0708.0643 | Andrey Leznov | A. N. Leznov | Kepler problem in deformed (quantum) four-dimensional space in non
relativistic limit with Galilei group of motion | 8 pages,no figures | null | null | null | math-ph math.MP | null | It is shown that Kepler problem in deformed (quantum) four-dimensional space
in non relativistic limit is integrable in quadratures. In non relativistic
limit group of motion of quantum space coincide with Galilei one.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 19:00:37 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"Leznov",
"A. N.",
""
]
] |
0708.0644 | Daniel A. Lidar | Sharif D. Kunikeev and Daniel A. Lidar (USC) | The Spin Density Matrix I: General Theory and Exact Master Equations | 14 pages, no figures | Phys. Rev. B 77, 045319 (2008) | 10.1103/PhysRevB.77.045319 | null | cond-mat.str-el physics.chem-ph quant-ph | null | We consider a scenario where interacting electrons confined in quantum dots
(QDs) are either too close to be resolved, or we do not wish to apply
measurements that resolve them. Then the physical observable is an electron
spin only (one cannot unambiguously ascribe a spin to a QD) and the system
state is fully described by the spin-density matrix. Accounting for the spatial
degrees of freedom, we examine to what extent a Hamiltonian description of the
spin-only degrees of freedom is valid. We show that as long as there is no
coupling between singlet and triplet states this is indeed the case, but when
there is such a coupling there are open systems effects, i.e., the dynamics is
non-unitary even without interaction with a true bath. Our primary focus is an
investigation of non-unitary effects, based on exact master equations we derive
for the spin-density matrix in the Lindblad and time-convolutionless (TCL)
forms, and the implications for quantum computation. In particular, we
demonstrate that the Heisenberg interaction does not affect the unitary part
(apart from a Lamb shift) but does affect the non-unitary contributions to time
evolution of the spin-density matrix. In a sequel paper we present a detailed
analysis of an example system of two quantum dots, including spin-orbit
effects.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 19:33:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kunikeev",
"Sharif D.",
"",
"USC"
],
[
"Lidar",
"Daniel A.",
"",
"USC"
]
] |
0708.0645 | Michael McGuigan | Michael McGuigan | Riemann Hypothesis, Matrix/Gravity Correspondence and FZZT Brane
Partition Functions | 17 pages, 2 figures, 1 table | null | null | null | math-ph hep-th math.MP | null | We investigate the physical interpretation of the Riemann zeta function as a
FZZT brane partition function associated with a matrix/gravity correspondence.
The Hilbert-Polya operator in this interpretation is the master matrix of the
large N matrix model. Using a related function $\Xi(z)$ we develop an analogy
between this function and the Airy function Ai(z) of the Gaussian matrix model.
The analogy gives an intuitive physical reason why the zeros lie on a critical
line. Using a Fourier transform of the $\Xi(z)$ function we identify a
Kontsevich integrand. Generalizing this integrand to $n \times n$ matrices we
develop a Kontsevich matrix model which describes n FZZT branes. The Kontsevich
model associated with the $\Xi(z)$ function is given by a superposition of
Liouville type matrix models that have been used to describe matrix model
instantons.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 18:57:16 GMT"
}
] | 2007-08-07T00:00:00 | [
[
"McGuigan",
"Michael",
""
]
] |
0708.0646 | J. E. Hirsch | J. E. Hirsch | Does the h-index have predictive power? | Sect. V added on combining h and N_c, with new Fig. 11. Other minor
changes. To be published in PNAS | Proc.Nat.Acad.Sci. vol. 104, 19193 (2007) | 10.1073/pnas.0707962104 | null | physics.soc-ph cond-mat.stat-mech hep-th | null | Bibliometric measures of individual scientific achievement are of particular
interest if they can be used to predict future achievement. Here we report
results of an empirical study of the predictive power of the h-index compared
to other indicators. Our findings indicate that the h-index is better than
other indicators considered (total citation count, citations per paper, and
total paper count) in predicting future scientific achievement. We discuss
reasons for the superiority of the h-index.
| [
{
"version": "v1",
"created": "Mon, 6 Aug 2007 07:44:50 GMT"
},
{
"version": "v2",
"created": "Sun, 14 Oct 2007 00:49:47 GMT"
}
] | 2008-03-02T00:00:00 | [
[
"Hirsch",
"J. E.",
""
]
] |
0708.0647 | Douglas Gingrich Mr. | Douglas M. Gingrich and Kevin Martell | Microcanonical treatment of black hole decay at the Large Hadron
Collider | small additions and clarifications, format for J. Phys. G | J. Phys. G: Nucl. Part. Phys. 35 (2008) 035001 | 10.1088/0954-3899/35/3/035001 | null | hep-ph | null | This study of corrections to the canonical picture of black hole decay in
large extra dimensions examines the effects of back-reaction corrected and
microcanonical emission at the LHC. We provide statistical interpretations of
the different multiparticle number densities in terms of black hole decay to
standard model particles. Provided new heavy particles of mass near the
fundamental Planck scale are not discovered, differences between these
corrections and thermal decay will be insignificant at the LHC.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 21:23:35 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Sep 2007 16:32:20 GMT"
},
{
"version": "v3",
"created": "Mon, 24 Dec 2007 03:58:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gingrich",
"Douglas M.",
""
],
[
"Martell",
"Kevin",
""
]
] |
0708.0648 | Zhu Han | Jianwei Huang, Zhu Han, Mung Chiang, and H. Vincent Poor | Auction-Based Distributed Resource Allocation for Cooperation
Transmission in Wireless Networks | To appear in the Proceedings of the IEEE IEEE Global Communications
Conference (GLOBECOM), Washington, DC, November 26 - 30, 2007 | null | 10.1109/GLOCOM.2007.912 | null | cs.IT math.IT | null | Cooperative transmission can greatly improve communication system performance
by taking advantage of the broadcast nature of wireless channels. Most previous
work on resource allocation for cooperation transmission is based on
centralized control. In this paper, we propose two share auction mechanisms,
the SNR auction and the power auction, to distributively coordinate the
resource allocation among users. We prove the existence, uniqueness and
effectiveness of the auction results. In particular, the SNR auction leads to a
fair resource allocation among users, and the power auction achieves a solution
that is close to the efficient allocation.
| [
{
"version": "v1",
"created": "Sat, 4 Aug 2007 21:33:18 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Huang",
"Jianwei",
""
],
[
"Han",
"Zhu",
""
],
[
"Chiang",
"Mung",
""
],
[
"Poor",
"H. Vincent",
""
]
] |
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