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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0704.1701 | Ming-chang Kang Professor | Ming-chang Kang and Shou-Jen Hu | Noether's problem for some p-groups | null | null | null | null | math.AC math.RA | null | Let K be any field and G be a finite group. Noether's problem asks whether
the fixed field is rational (=purely transcendental) over K. We will prove that
if G is a non-abelian p-group of order p^n containing a cyclic subgroup of
index p and K is any field containing a primitive p^{n-2}-th root of unity,
then K(G) is rational over K.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 05:39:45 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kang",
"Ming-chang",
""
],
[
"Hu",
"Shou-Jen",
""
]
] |
0704.1702 | Meng Chen | Jungkai A. Chen, Meng Chen | The canonical volume of threefolds of general type with $\chi<1$ | 16 pages, Updated version, To appear in Journal of LMS | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the canonical volume $K^3\geq {1/30}$ for all projective
3-folds of general type with $\chi(\mathcal{O})\leq 0$. This bound is sharp.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 06:36:15 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jun 2008 12:48:11 GMT"
},
{
"version": "v3",
"created": "Fri, 27 Jun 2008 04:46:33 GMT"
}
] | 2008-06-27T00:00:00 | [
[
"Chen",
"Jungkai A.",
""
],
[
"Chen",
"Meng",
""
]
] |
0704.1703 | Troy Porter | T. A. Porter, I. V. Moskalenko, and A. W. Strong | Very High Energy Gamma Rays from Supernova Remnants and Constraints on
the Galactic Interstellar Radiation Field | To appear in the proceedings of the 1st GLAST Symposium | AIPConf.Proc.921:411-412,2007 | 10.1063/1.2757377 | SLAC-PUB-12466 | astro-ph | null | The large-scale Galactic interstellar radiation field (ISRF) is the result of
stellar emission and dust re-processing of starlight. Where the energy density
of the ISRF is high (e.g., the Galactic Centre), the dominant gamma-ray
emission in individual supernova remnants (SNRs), such as G0.9+0.1, may come
from inverse Compton (IC) scattering of the ISRF. Several models of the ISRF
exist. The most recent one, which has been calculated by us, predicts a
significantly higher ISRF than the well-used model of Mathis, Mezger, and
Panagia. However,comparison with data is limited to local observations. Based
on our current estimate of the ISRF we predict the gamma-ray emission in the
SNRs G0.9+0.1 and RXJ1713, and pair-production absorption features above 20 TeV
in the spectra of G0.9+0.1, J1713-381, and J1634-472. We discuss how GLAST,
along with current and future very high energy instruments, may be able to
provide upper bounds on the large-scale ISRF.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:30:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Porter",
"T. A.",
""
],
[
"Moskalenko",
"I. V.",
""
],
[
"Strong",
"A. W.",
""
]
] |
0704.1704 | Tigran Sedrakyan | T. A. Sedrakyan and M. E. Raikh | Magneto-oscillations due to electron-electron interactions in the ac
conductivity of a 2D electron gas | 4+ pages, 3 figures | Phys. Rev. Lett. 100, 086808 (2008) | 10.1103/PhysRevLett.100.086808 | null | cond-mat.mes-hall | null | Electron-electron interactions give rise to the correction,
\delta\sigma^{int}(\omega), to the ac magnetoconductivity, \sigma(\omega), of a
clean 2D electron gas that is periodic in \omega_c^{-1}, where \omega_c is the
cyclotron frequency. Unlike conventional harmonics of the cyclotron resonance,
which are periodic with \omega, this correction is periodic with \omega^{3/2}.
Oscillations in \delta\sigma^{int}(\omega) develop at low magnetic fields,
\omega_c\ll\omega, when the conventional harmonics are suppressed by the
disorder. Their origin is a {\em double} backscattering of an electron from the
impurity-induced Friedel oscillations. During the time \sim\omega^{-1} between
the two backscattering events the electron travels only a {\em small portion}
of the Larmour circle.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:20:20 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 23:20:04 GMT"
}
] | 2008-03-05T00:00:00 | [
[
"Sedrakyan",
"T. A.",
""
],
[
"Raikh",
"M. E.",
""
]
] |
0704.1705 | S. E. Korshunov | I.V. Kolokolov and S.E. Korshunov | Optimal fluctuation approach to a directed polymer in a random medium | 4 pages, no figures | Phys. Rev. B 75, 140201 (2007) | 10.1103/PhysRevB.75.140201 | null | cond-mat.dis-nn cond-mat.stat-mech | null | A modification of the optimal fluctuation approach is applied to study the
tails of the free energy distribution function P(F) for an elastic string in
quenched disorder both in the regions of the universal behavior of P(F) and in
the regions of large fluctuations, where the behavior of P(F) is non-universal.
The difference between the two regimes is shown to consist in whether it is
necessary or not to take into account the renormalization of parameters by the
fluctuations of disorder in the vicinity of the optimal fluctuation.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:24:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kolokolov",
"I. V.",
""
],
[
"Korshunov",
"S. E.",
""
]
] |
0704.1706 | Nick van Eijndhoven | N. van Eijndhoven, O. Fadiran and G. Japaridze | Implementation of a Gauss convoluted Pandel PDF for track reconstruction
in Neutrino Telescopes | 9 pages, 4 figures Revision 1 : extended content 12 pages, 4 figures
Accepted for publication in Astroparticle Physics | Astropart.Phys.28:456-462,2007 | 10.1016/j.astropartphys.2007.09.001 | null | astro-ph | null | A probability distribution function is presented which provides a realistic
description of the detection of scattered photons. The resulting probabilities
can be described analytically by means of a superposition of several special
functions. These exact expressions can be evaluated numerically only for small
distances and limited time residuals, due to computer accuracy limitations. In
this report we provide approximations for the exact expressions in different
regions of the distance-time residual space, defined by the detector geometry
and the space-time scale of an event. These approximations can be evaluated
numerically with a relative error with respect to the exact expression at the
boundaries of less than 0.001.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:26:14 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 09:20:16 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"van Eijndhoven",
"N.",
""
],
[
"Fadiran",
"O.",
""
],
[
"Japaridze",
"G.",
""
]
] |
0704.1707 | Linda Buisman | Linda Buisman and Rajeev Gor\'e | A Cut-free Sequent Calculus for Bi-Intuitionistic Logic: Extended
Version | null | null | null | null | cs.LO | null | Bi-intuitionistic logic is the extension of intuitionistic logic with a
connective dual to implication. Bi-intuitionistic logic was introduced by
Rauszer as a Hilbert calculus with algebraic and Kripke semantics. But her
subsequent ``cut-free'' sequent calculus for BiInt has recently been shown by
Uustalu to fail cut-elimination. We present a new cut-free sequent calculus for
BiInt, and prove it sound and complete with respect to its Kripke semantics.
Ensuring completeness is complicated by the interaction between implication and
its dual, similarly to future and past modalities in tense logic. Our calculus
handles this interaction using extended sequents which pass information from
premises to conclusions using variables instantiated at the leaves of failed
derivation trees. Our simple termination argument allows our calculus to be
used for automated deduction, although this is not its main purpose.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:29:31 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Apr 2007 03:11:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Buisman",
"Linda",
""
],
[
"Goré",
"Rajeev",
""
]
] |
0704.1708 | Qiuping A. Wang | Qiuping A. Wang (ISMANS) | From virtual work principle to least action principle for stochastic
dynamics | 13 pages | null | null | null | cond-mat.stat-mech | null | After the justification of the maximum entropy principle for equilibrium
mechanical system from the principle of virtual work, i.e., the virtual work of
microscopic forces on the elements of a mechanical system vanishes in
thermodynamic equilibrium, we present in this paper an application of the same
principle to dynamical systems out of equilibrium. The aim of this work is to
justify a least action principle and the concurrent maximum path entropy
principle for nonequilibrium thermodynamic systems.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:30:52 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Apr 2007 10:36:27 GMT"
},
{
"version": "v3",
"created": "Sun, 9 Dec 2007 08:30:44 GMT"
}
] | 2007-12-09T00:00:00 | [
[
"Wang",
"Qiuping A.",
"",
"ISMANS"
]
] |
0704.1709 | Marie Cottrell | Marie Cottrell (SAMOS, Matisse), Smail Ibbou (SAMOS, Matisse), Patrick
Letr\'emy (SAMOS, Matisse) | Traitement Des Donnees Manquantes Au Moyen De L'Algorithme De Kohonen | null | Actes de la dixi\`eme conf\'erence ACSEG 2003 (Nantes) (2003)
201-217 | null | null | stat.AP cs.NE | null | Nous montrons comment il est possible d'utiliser l'algorithme d'auto
organisation de Kohonen pour traiter des donn\'ees avec valeurs manquantes et
estimer ces derni\`eres. Apr\`es un rappel m\'ethodologique, nous illustrons
notre propos \`a partir de trois applications \`a des donn\'ees r\'eelles.
-----
We show how it is possible to use the Kohonen self-organizing algorithm to
deal with data which contain missing values and to estimate them. After a
methodological recall, we illustrate our purpose from three real databases
applications.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:33:15 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cottrell",
"Marie",
"",
"SAMOS, Matisse"
],
[
"Ibbou",
"Smail",
"",
"SAMOS, Matisse"
],
[
"Letrémy",
"Patrick",
"",
"SAMOS, Matisse"
]
] |
0704.1710 | Kazuya Mitsutani | Kazuya Mitsutani, Masakiyo Kitazawa, Teiji Kunihiro, Yukio Nemoto | Further Analysis of Excitations of Quarks at Finite Temperature -- Mass
Effect and Pole Structure -- | 6pages, 5 figures. Poster presentation at the 19th International
Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (QM2006) held in
Shanghai, China on November 14-20, 2006 | Int.J.Mod.Phys.E16:2263-2268,2007 | 10.1142/S0218301307007787 | YITP-07-19 | hep-ph | null | We calculate the spectral function of the massive quark at finite temperature
(T) using a Yukawa model and show that the peak in the negative energy region
among the three-peaks found in a previous work for the massless quark is
largely suppressed. To explore the underlying mechanism of this behavior, we
also investigate the pole structure of the retarded Green function of the
quark. We will show the result only for the massless quark. We find the
residues of the poles corresponding the three-peaks are all comparable at
$T\sim m_b$. We also show that the multi-peak structure of the quark spectra is
well described in the pole approximation which indicates that the quasi-paricle
picture is valid in this $T$ region.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:43:05 GMT"
}
] | 2010-11-26T00:00:00 | [
[
"Mitsutani",
"Kazuya",
""
],
[
"Kitazawa",
"Masakiyo",
""
],
[
"Kunihiro",
"Teiji",
""
],
[
"Nemoto",
"Yukio",
""
]
] |
0704.1711 | Marie Cottrell | Patrick Letr\'emy (SAMOS, CES), Marie Cottrell (SAMOS, CES), Patrice
Gaubert (SAMOS, CES), Joseph Rynkiewicz (SAMOS, CES) | Dynamical Equilibrium, trajectories study in an economical system. The
case of the labor market | accepted to the WSOM 2007 Conference (Bielefield) | null | null | null | stat.AP | null | The paper deals with the study of labor market dynamics, and aims to
characterize its equilibriums and possible trajectories. The theoretical
background is the theory of the segmented labor market. The main idea is that
this theory is well adapted to interpret the observed trajectories, due to the
heterogeneity of the work situations.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:49:11 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 10:23:34 GMT"
}
] | 2007-07-09T00:00:00 | [
[
"Letrémy",
"Patrick",
"",
"SAMOS, CES"
],
[
"Cottrell",
"Marie",
"",
"SAMOS, CES"
],
[
"Gaubert",
"Patrice",
"",
"SAMOS, CES"
],
[
"Rynkiewicz",
"Joseph",
"",
"SAMOS, CES"
]
] |
0704.1712 | Ayumu Sugita | Ayumu Sugita | Borromean Entanglement Revisited | Proceedings of the International Workshop on "Knot Theory for
Scientic Objects" held in Osaka (Japan), March 8-10, 2006. 10 pages, 5
figures | null | null | null | quant-ph | null | An interesting analogy between quantum entangled states and topological links
was suggested by Aravind. In particular, he emphasized a connection between the
Greenberger-Horne-Zeilinger (GHZ) state and the Borromean rings. However, he
made the connection in a way that depends on the choice of measurement basis.
We reconsider it in a basis-independent way by using the reduced density
matrix.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:53:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sugita",
"Ayumu",
""
]
] |
0704.1713 | Shuji Deguchi | S. Deguchi, T. Fujii, Y. Ita, H. Imai, H. Izumiura, O. Kameya, N.
Matsunaga, A. Miyazaki, A. Mizutani, Y. Nakada, J. Nakashima, A. Winnberg | An SiO Maser Search off the Galactic Plane | PASJ No.3 (June 25, 2007 issue in press) | null | 10.1093/pasj/59.3.559 | NRO report No.651 | astro-ph | null | We have searched for the SiO J=1--0 v= 1 and 2 maser lines at ~ 43 GHz in 277
2MASS/MSX/IRAS sources off the Galactic plane (|b|> 3 deg), which resulted in
119 (112 new) detections. Among the new detections, are two very faint objects
with MSX 12 micron flux densities below 2 Jy. These are likely to be O-rich
AGB-stars associated with dwarf-galaxy tidal tails. The sample also includes
medium bright MSX objects at moderately high Galactic latitudes (3 deg<|b|<5
deg) and in the IRAS gap at higher latitudes. A signature of a warp of the
inner Galactic disk is found for a disk subsample. This warp appears relatively
strongly in the area of 0<l<45 deg and 3<|b|<5 deg. We also found a group of
stars that does not follow to the Galactic rotation. This feature appears in
the Galactic disk at l~ 27 deg, and extends more than 15 deg in Galactic
latitude, like a stream of tidal debris from a dwarf galaxy.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:57:04 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Deguchi",
"S.",
""
],
[
"Fujii",
"T.",
""
],
[
"Ita",
"Y.",
""
],
[
"Imai",
"H.",
""
],
[
"Izumiura",
"H.",
""
],
[
"Kameya",
"O.",
""
],
[
"Matsunaga",
"N.",
""
],
[
"Miyazaki",
"A.",
""
],
[
"Mizutani",
"A.",
""
],
[
"Nakada",
"Y.",
""
],
[
"Nakashima",
"J.",
""
],
[
"Winnberg",
"A.",
""
]
] |
0704.1714 | Boris Petukhov | B. V. Petukhov | Dislocation Dynamics in a Crystal Lattice (Peierls-Nabarro) Relief | 39 pages, 15 figures | null | null | null | nlin.PS | null | The theory of the dislocation motion in the periodic potential relief of the
crystal lattice (the Peierls-Nabarro barriers) is reviewed. On the basis of the
kink mechanism the temperature dependence of the flow stress is described for a
wide class of materials. The theory of quantum mechanical dislocation
tunnelling through the Peierls-Nabarro barriers is extended and compared with
experimental data on the plasticity of alkali halides, BCC and HCP metals at
low temperatures. The behavior of the flow stress at the range of athermic
anomalies is modeled by changing the mechanism of the dislocation motion from
the thermally activated hopping over the barriers to the quantum tunnelling
through them. Some results of previous calculations are represented in a more
explicit convenient for applications form. The pronounced effect of the
switching between the normal and the superconducting states on the flow stress
of metals is explained on the basis of the change in the dissipative properties
of the electron subsystem affecting the dislocation motion.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 07:58:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Petukhov",
"B. V.",
""
]
] |
0704.1715 | Leonid Ksenofontov | E.G.Berezhko, H.J.Voelk | Spectrum of cosmic rays, produced in supernova remnants | 4 pages with emulateapj, 3 figures, accepted for publication in the
Astrophysical Journal Letters | null | 10.1086/518737 | null | astro-ph | null | Nonlinear kinetic theory of cosmic ray (CR) acceleration in supernova
remnants is employed to calculate CR spectra. The magnetic field in SNRs is
assumed to be significantly amplified by the efficiently accelerating nuclear
CR component. It is shown that the calculated CR spectra agree in a
satisfactory way with the existing measurements up to the energy $10^{17}$ eV.
The power law spectrum of protons extends up to the energy $3\times 10^{15}$ eV
with a subsequent exponential cutoff. It gives a natural explanation for the
observed knee in the Galactic CR spectrum. The maximum energy of the
accelerated nuclei is proportional to their charge number $Z$. Therefore the
break in the Galactic CR spectrum is the result of the contribution of
progressively heavier species in the overall CR spectrum so that at $10^{17}$
eV the CR spectrum is dominated by iron group nuclei. It is shown that this
component plus a suitably chosen extragalactic CR component can give a
consistent description for the entire Galactic CR spectrum.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 09:26:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Berezhko",
"E. G.",
""
],
[
"Voelk",
"H. J.",
""
]
] |
0704.1716 | Paluba Waldemar | Waldemar Paluba | One-parameter families of functions in the Pick class | null | null | null | null | math.DS | null | In the one-parameter family of power-law maps of the form
$f_a(x)=-|x|^{\alpha}+a,$ $\alpha >1,$ we give examples of mutually related
dynamically determined quantities, depending on the parameter $a$, such that
one is a Pick function of the following one. These Pick functions are
extendable by reflection through the $(1,+\infty)$ half-axis and have
completely monotone derivatives there.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 08:23:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Paluba",
"Waldemar",
""
]
] |
0704.1717 | Gerhard Roehrle | J. Matthew Douglass and Gerhard Roehrle | The homology of the Steinberg variety and Weyl group coinvariants | 17 pages, to appear in Documenta Math | null | null | null | math.RT math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let G be a complex, connected, reductive algebraic group with Weyl group W
and Steinberg variety Z. We show that the graded Borel-Moore homology of Z is
isomorphic to the smash product of the coinvariant algebra of W and the group
algebra of W.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 08:31:09 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Sep 2008 10:43:19 GMT"
},
{
"version": "v3",
"created": "Fri, 31 Jul 2009 17:01:51 GMT"
}
] | 2009-07-31T00:00:00 | [
[
"Douglass",
"J. Matthew",
""
],
[
"Roehrle",
"Gerhard",
""
]
] |
0704.1718 | Anjan Kumar Chandra | Anjan Kumar Chandra, Subinay Dasgupta | Spin-spin Correlation in Some Excited States of Transverse Ising Model | 5 pages, 1 figure | J. Phys. A: Math. Theor. 40 (2007) 5231-5239 | 10.1088/1751-8113/40/20/001 | null | cond-mat.stat-mech | null | We consider the transverse Ising model in one dimension with
nearest-neighbour interaction and calculate exactly the longitudinal spin-spin
correlation for a class of excited states. These states are known to play an
important role in the perturbative treatment of one-dimensional transverse
Ising model with frustrated second-neighbour interaction. To calculate the
correlation, we follow the earlier procedure of Wu, use Szego's theorem and
also use Fisher-Hartwig conjecture. The result is that the correlation decays
algebraically with distance ($n$) as $1/\surd n$ and is oscillatory or
non-oscillatory depending on the magnitude of the transverse field.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 08:38:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chandra",
"Anjan Kumar",
""
],
[
"Dasgupta",
"Subinay",
""
]
] |
0704.1719 | Paolo Nason | Michelangelo L. Mangano and Paolo Nason | Radiative quarkonium decays and the NMSSM Higgs interpretation of the
HyperCP Sigma+ --> p mu+mu- events | 6 pages, no figures | Mod.Phys.Lett.A22:1373-1380,2007 | 10.1142/S0217732307023729 | Bicocca-FT-07-6, CERN-PH-TH/2007-062 | hep-ph | null | We study the potential of radiative decays of the Upsilon(1S) and of the phi
mesons to search for a light pseudoscalar Higgs boson, proposed as a possible
interpretation of Sigma+ --> p mu+mu- events observed by the HyperCP
collaboration at Fermilab. We conclude that the detection of this signal should
certainly be possible with the current CLEO Upsilon(1S) data, and is within the
reach of KLOE in at least part of the range of couplings suggested by the
HyperCP findings.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 08:48:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mangano",
"Michelangelo L.",
""
],
[
"Nason",
"Paolo",
""
]
] |
0704.1720 | Mikko Laine | M. Laine | A resummed perturbative estimate for the quarkonium spectral function in
hot QCD | 16 pages. v2: misprint fixed, minor additions | JHEP 0705:028,2007 | 10.1088/1126-6708/2007/05/028 | null | hep-ph hep-lat | null | By making use of the finite-temperature real-time static potential that was
introduced and computed to leading non-trivial order in Hard Thermal Loop
resummed perturbation theory in recent work, and solving numerically a
Schr\"odinger-type equation, we estimate the quarkonium (in practice,
bottomonium) contribution to the spectral function of the electromagnetic
current in hot QCD. The spectral function shows a single resonance peak which
becomes wider and then disappears as the temperature is increased beyond 450
MeV or so. This behaviour can be compared with recently attempted lattice
reconstructions of the same quantity, based on the ``maximum entropy method'',
which generically show several peaks. We also specify the dependence of our
results on the spatial momentum of the electromagnetic current, as well as on
the baryon chemical potential characterising the hot QCD plasma.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 18:26:59 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2007 13:24:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Laine",
"M.",
""
]
] |
0704.1721 | Terunuma Sachiko | Masako Bando, Yoko Fukase, Jonathan Shock, Akio Sugamoto, Sachiko
Terunuma | An Exotic Approach to Hadron Physics | 8 pages, 5 figures, to appear in the proceedings for YKIS06 | Prog.Theor.Phys.Suppl.168:223-230,2007 | 10.1143/PTPS.168.223 | null | hep-ph | null | An exotic approach to hadrons is discussed. It is based on the recently
developed open-closed string duality explicitly conjectured as the AdS/CFT
correspondence. Mesons as well as pentaquarks are studied in this approach.
Spins are introduced as distribution functions over the string, and a second
quantization method of string theory is examined and used to estimate the mass
and decay width of various hadrons. This approach provides a way to understand
the structure of flavor by a configuration of probe branes.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 08:46:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bando",
"Masako",
""
],
[
"Fukase",
"Yoko",
""
],
[
"Shock",
"Jonathan",
""
],
[
"Sugamoto",
"Akio",
""
],
[
"Terunuma",
"Sachiko",
""
]
] |
0704.1722 | Hiroshi Watanabe | Hiroshi Watanabe and Masao Ogata | Fermi Surface Reconstruction without Breakdown of Kondo Screening at
Quantum Critical Point | 4 pages, 3 figures, submitted to Physical Review Letters | Phys. Rev. Lett. 99, 136401 (2007) | 10.1103/PhysRevLett.99.136401 | null | cond-mat.str-el | null | Motivated by recent Hall-effect experiment in YbRh$_2$Si$_2$, we study ground
state properties of a Kondo lattice model in a two-dimensional square lattice
using variational Monte Carlo method. We show that there are two types of phase
transition, antiferromagnetic transition and topological one (Fermi surface
reconstruction). In a wide region of parameters, these two transitions occur
simultaneously without the breakdown of Kondo screening, accompanied by a
discontinuous change of the Hall coefficient. This result is consistent with
the experiment and gives a novel theoretical picture for the quantum critical
point in heavy fermion systems.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 08:59:39 GMT"
}
] | 2007-09-26T00:00:00 | [
[
"Watanabe",
"Hiroshi",
""
],
[
"Ogata",
"Masao",
""
]
] |
0704.1723 | Andres Asensio Ramos | A. Asensio Ramos (1), J. Trujillo Bueno (1,2) ((1) IAC, (2) CSIC) | A User-Friendly Code to Diagnose Chromospheric Plasmas | 8 pages, 3 figures, proceedings of "Physics of Chromospheric Plasmas"
(Coimbra), ASP 368, 163 (2007) | null | null | null | astro-ph | null | The physical interpretation of spectropolarimetric observations of lines of
neutral helium, such as those of the 10830 A multiplet, represents an excellent
opportunity for investigating the magnetism of plasma structures in the solar
chromosphere. Here we present a powerful forward modeling and inversion code
that permits either to calculate the emergent intensity and polarization for
any given magnetic field vector or to infer the dynamical and magnetic
properties from the observed Stokes profiles. This diagnostic tool is based on
the quantum theory of spectral line polarization, which self-consistently
accounts for the Hanle and Zeeman effects in the most general case of the
incomplete Paschen-Back effect regime. We also take into account radiative
transfer effects. An efficient numerical scheme based on global optimization
methods has been applied. Our Stokes inversion code permits a fast and reliable
determination of the global minimum.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 09:21:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ramos",
"A. Asensio",
"",
"IAC"
],
[
"Bueno",
"J. Trujillo",
"",
"IAC",
"CSIC"
]
] |
0704.1724 | Marco Ruggieri | M. Ruggieri | Inhomogeneous color superconductivity and the cooling of compact stars | 4 pages, 1 figure, uses aiproc style. Talk given at "Quark
confinement and the hadron spectrum", Ponta Delgada, Acores, Portugal, 2-7
September 2006 | AIPConf.Proc.892:495-498,2007 | 10.1063/1.2714452 | null | hep-ph | null | In this talk I discuss the inhomogeneous (LOFF) color superconductive phases
of Quantum Chromodynamics (QCD). In particular, I show the effect of a core of
LOFF phase on the cooling of a compact star.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 09:28:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ruggieri",
"M.",
""
]
] |
0704.1725 | Pulak Ranjan Giri | Pulak Ranjan Giri | Scaling anomaly in cosmic string background | 4 pages,1 figure | Eur.Phys.J.C56:147-151,2008 | 10.1140/epjc/s10052-008-0635-1 | SINP/TNP/2007/05 | hep-th gr-qc | null | We show that the classical scale symmetry of a particle moving in cosmic
string background is broken upon inequivalent quantization of the classical
system, leading to anomaly. The consequence of this anomaly is the formation of
single bound state in the coupling interval \gamma\in(-1,1). The inequivalent
quantization is characterized by a 1-parameter family of self-adjoint extension
parameter \omega. It has been conjectured that the formation of loosely bound
state in cosmic string background may lead to the so called anomalous
scattering cross section for the particles, which is usually seen in molecular
physics.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 09:38:06 GMT"
},
{
"version": "v2",
"created": "Sat, 14 Apr 2007 08:33:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Giri",
"Pulak Ranjan",
""
]
] |
0704.1726 | Agung Budiyono | Agung Budiyono | On de Broglie's quantum particle as the soliton solution of linear
Schr\"odinger equation | 14 pages, content changed | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a class of soliton solution of {\it linear} Schr\"odinger equation
without external potential. The quantum probability density generates its own
boundary inside which there is internal vibration whose wave number is
determined by the velocity of the particle as firstly conjectured by de
Broglie. Assuming resonance of the internal vibration will lead to quantization
of particle's momentum in term of wave number of the envelope quantum
probability density. We further show that the linearity of the Schr\"odinger
equation allows us to have non-interacting many solitons solution through
superposition, each describing a particle with equal mass.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 09:43:46 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Aug 2009 05:56:55 GMT"
}
] | 2009-08-19T00:00:00 | [
[
"Budiyono",
"Agung",
""
]
] |
0704.1727 | Gustavo Niz | Gustavo Niz and Neil Turok | Stringy corrections to a time-dependent background solution of string
and M-Theory | 22 pages, 4 figures | Phys.Rev.D75:126004,2007 | 10.1103/PhysRevD.75.126004 | Phys.Rev.D75:126004,2007. | hep-th | null | We consider one of the simplest time-dependent backgrounds in M-theory,
describing the shrinking away of the M-theory dimension with the other spatial
dimensions static. As the M-theory dimension becomes small, the situation
becomes well-described by string theory in a singular cosmological background
where the string coupling tends to zero but the $\alpha'$-corrections become
large, near the cosmic singularity. We compute these $\alpha'$-corrections,
both for the background and for linearized perturbations, in heterotic string
theory, and show they may be reproduced by a map from eleven-dimensional
M-theory.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 09:46:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Niz",
"Gustavo",
""
],
[
"Turok",
"Neil",
""
]
] |
0704.1728 | S. Mignemi | S. Mignemi | Doubly Special Relativity and Finsler geometry | 8 pages, plain TeX | Phys.Rev.D76:047702,2007 | 10.1103/PhysRevD.76.047702 | null | gr-qc | null | We discuss the recent proposal of implementing Doubly Special Relativity in
configuration space by means of Finsler geometry. Although this formalism leads
to a consistent description of the dynamics of a particle, it does not seem to
give a complete description of the physics. In particular, the Finsler line
element is not invariant under the deformed Lorentz transformations of Doubly
Special Relativity. We study in detail some simple applications of the
formalism.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 09:51:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mignemi",
"S.",
""
]
] |
0704.1729 | Silvia Piranomonte Miss | S. Piranomonte, M. Perri, P. Giommi, H. Landt, P. Padovani | The Sedentary Survey of Extreme High Energy Peaked BL Lacs III. Results
from Optical Spectroscopy | 23 pages, accepted by A&A | null | 10.1051/0004-6361:20077086 | null | astro-ph | null | The multi-frequency Sedentary Survey is a flux limited, statistically
well-defined sample of highly X-ray dominated BL Lacertae objects (HBLs) which
includes 150 sources. In this paper, the third of the series, we report the
results of a dedicated optical spectroscopy campaign that, together with
results from other independent optical follow up programs, led to the
spectroscopic identification of all sources in the sample. We carried out a
systematic spectroscopic campaign for the observation of all unidentified
objects of the sample using the ESO 3.6m, the KPNO 4m, and the TNG optical
telescopes. We present new identifications and optical spectra for 76 sources,
50 of which are new BL Lac objects, 18 are sources previously referred as BL
Lacs but for which no redshift information was available, and 8 are broad
emission lines AGNs. We find that the multi-frequency selection technique used
to build the survey is highly efficient (about 90%) in selecting BL Lacs
objects. We present positional and spectroscopic information for all confirmed
BL Lac objects. Our data allowed us to determined 36 redshifts out of the 50
new BL Lacs and 5 new redshifts for the previously known objects. The redshift
distribution of the complete sample is presented and compared with that of
other BL Lacs samples. For 26 sources without recognizable absorption features,
we calculated lower limits to the redshift using a method based on simulated
optical spectra with different ratios between jet and galaxy emission. For a
subsample of 38 object with high-quality spectra, we find a correlation between
the optical spectral slope, the 1.4 GHz radio luminosity, and the Ca H&K break
value, indicating that for powerful/beamed sources the optical light is
dominated by the non-thermal emission from the jet.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 10:36:26 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Apr 2007 15:56:26 GMT"
},
{
"version": "v3",
"created": "Fri, 4 May 2007 15:25:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Piranomonte",
"S.",
""
],
[
"Perri",
"M.",
""
],
[
"Giommi",
"P.",
""
],
[
"Landt",
"H.",
""
],
[
"Padovani",
"P.",
""
]
] |
0704.1730 | Carlo H\"am\"al\"ainen | Nicholas J. Cavenagh, Ales Drapal, and Carlo Hamalainen | Latin bitrades derived from groups | 23 pages | null | null | null | math.CO | null | A latin bitrade is a pair of partial latin squares which are disjoint, occupy
the same set of non-empty cells, and whose corresponding rows and columns
contain the same set of entries. Dr\'apal (\cite{Dr9}) showed that a latin
bitrade is equivalent to three derangements whose product is the identity and
whose cycles pairwise have at most one point in common. By letting a group act
on itself by right translation, we show how some latin bitrades may be derived
from groups without specifying an independent group action. Properties of latin
trades such as homogeneousness, minimality (via thinness) and orthogonality may
also be encoded succinctly within the group structure. We apply the
construction to some well-known groups, constructing previously unknown latin
bitrades. In particular, we show the existence of minimal, $k$-homogeneous
latin trades for each odd $k\geq 3$. In some cases these are the smallest known
such examples.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 10:36:30 GMT"
},
{
"version": "v2",
"created": "Sat, 8 Mar 2008 10:09:24 GMT"
}
] | 2008-03-08T00:00:00 | [
[
"Cavenagh",
"Nicholas J.",
""
],
[
"Drapal",
"Ales",
""
],
[
"Hamalainen",
"Carlo",
""
]
] |
0704.1731 | Pedro Gonzalez-Diaz | Pedro F Gonzalez-Diaz and Prado Martin-Moruno (IMAFF, CSIC) | Wormholes in the accelerating universe | 2 pages, LaTex, to appear in the Proceedings of the 11th Marcel
Grossmann Conference, 2006 | null | 10.1142/9789812834300_0358 | IMAFF-RCA-05-07 | astro-ph | null | We discuss different arguments that have been raised against the viability of
the big trip process, reaching the conclusions that this process can actually
occur by accretion of phantom energy onto the wormholes and that it is stable
and might occur in the global context of a multiverse model. We finally argue
that the big trip does not contradict any holographic bounds on entropy and
information.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 10:38:21 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Gonzalez-Diaz",
"Pedro F",
"",
"IMAFF, CSIC"
],
[
"Martin-Moruno",
"Prado",
"",
"IMAFF, CSIC"
]
] |
0704.1732 | Sergey Bastrukov | S. Bastrukov, H-K. Chang, S. Misicu, I. Molodtsova, D. Podgainy | Spheroidal and torsional modes of quasistatic shear oscillations in the
solid globe models of nuclear physics and pulsar astrophysics | 34 pages; 6 figures; Int.J.Mod.Phys.A.2007.Vol.22.N19.pp3261-3291 | Int.J.Mod.Phys.A22:3261-3291,2007 | 10.1142/S0217751X07036634 | null | astro-ph | null | The past three decades of investigation on nuclear physics and pulsar
astrophysics have seen gradual recognition that elastodynamic approach to the
continuum mechanics of nuclear matter provides proper account of macroscopic
motions of degenerate Fermi-matter constituting interior of the nuclear
material objects, the densest of all known today. This paper focuses on one
theoretical issue of this development which is concerned with oscillatory
behavior of a viscoelastic solid globe in the regime of quasistatic,
force-free, non-compressional oscillations less investigated in the literature
compared to oscillations in the regime of standing shear waves. We show that in
this case the problem of computing frequency and lifetime of spheroidal and
torsional modes of non-radial shear vibrations damped by viscosity can be
unambiguously resolved by working from the energy balance equation and taking
advantage of the Rayleigh's variational method. The efficiency of this method
is demonstrated by solid globe models of nuclear physics and pulsar
astrophysics dealing with oscillations of a spherical mass of a viscoelastic
Fermi-solid with homogeneous and non-homogeneous profiles of the bulk density,
the shear modulus, and the shear viscosity.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:12:11 GMT"
},
{
"version": "v2",
"created": "Sun, 15 Apr 2007 02:32:15 GMT"
},
{
"version": "v3",
"created": "Fri, 27 Apr 2007 04:51:09 GMT"
},
{
"version": "v4",
"created": "Mon, 16 Jul 2007 13:15:32 GMT"
},
{
"version": "v5",
"created": "Wed, 15 Aug 2007 08:02:46 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bastrukov",
"S.",
""
],
[
"Chang",
"H-K.",
""
],
[
"Misicu",
"S.",
""
],
[
"Molodtsova",
"I.",
""
],
[
"Podgainy",
"D.",
""
]
] |
0704.1733 | Orfeu Bertolami | Orfeu Bertolami, Christian G. Boehmer, Tiberiu Harko, Francisco S.N.
Lobo | Extra force in $f(R)$ modified theories of gravity | Revtex4 file, 5 pages. Version to appear in Physical Review D | Phys.Rev.D75:104016,2007 | 10.1103/PhysRevD.75.104016 | null | gr-qc astro-ph hep-th | null | The equation of motion for test particles in $f(R)$ modified theories of
gravity is derived. By considering an explicit coupling between an arbitrary
function of the scalar curvature, $R$, and the Lagrangian density of matter, it
is shown that an extra force arises. This extra force is orthogonal to the
four-velocity and the corresponding acceleration law is obtained in the weak
field limit. Connections with MOND and with the Pioneer anomaly are further
discussed.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:49:59 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 12:03:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Boehmer",
"Christian G.",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] |
0704.1734 | Alan Coley | A.A. Coley | Averaging and Cosmological Observations | 9 pages | null | null | null | gr-qc astro-ph hep-th | null | The gravitational field equations on cosmological scales are obtained by
averaging the Einstein field equations of general relativity. By assuming
spatial homogeneity and isotropy on the largest scales, the local
inhomogeneities affect the dynamics though correction (backreaction) terms,
which can lead to behaviour qualitatively and quantitatively different from the
Friedmann-Lema\^{i}tre-Robertson-Walker models. The effects of averaging on
cosmological observations are discussed. It is argued that, based on estimates
from observational data, the backreaction (and, in particular, the averaged
spatial curvature) can have a very significant dynamical effect on the
evolution of the Universe and must be taken into account in observational
cosmology.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 17:36:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Coley",
"A. A.",
""
]
] |
0704.1735 | Peter Blair Blakie | P. B. Blakie, E. Toth, M. J. Davis | Calorimetry of Bose-Einstein condensates | 6 pages, 1 figure. Updated to published version | J. Phys. B: At. Mol. Opt. Phys. 40, 3273 (2007) | 10.1088/0953-4075/40/16/008 | null | cond-mat.other | null | We outline a practical scheme for measuring the thermodynamic properties of a
Bose-Einstein condensate as a function of internal energy. We propose using
Bragg scattering and controlled trap manipulations to impart a precise amount
of energy to a near zero temperature condensate. After thermalisation the
temperature can be measured using standard techniques to determine the state
equation $T(U,N,\omega)$. Our analysis accounts for interaction effects and the
excitation of constants of motion which restrict the energy available for
thermalisation.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:25:00 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Aug 2007 23:14:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Blakie",
"P. B.",
""
],
[
"Toth",
"E.",
""
],
[
"Davis",
"M. J.",
""
]
] |
0704.1736 | Elham Kashefi | Anne Broadbent and Elham Kashefi | Parallelizing Quantum Circuits | 34 pages, 14 figures; depth complexity, measurement-based quantum
computing and parallel computing | Theoretical Computer Science, Volume 410, Issue 26, 2009 | 10.1016/j.tcs.2008.12.046 | null | quant-ph | null | We present a novel automated technique for parallelizing quantum circuits via
forward and backward translation to measurement-based quantum computing
patterns and analyze the trade off in terms of depth and space complexity. As a
result we distinguish a class of polynomial depth circuits that can be
parallelized to logarithmic depth while adding only polynomial many auxiliary
qubits. In particular, we provide for the first time a full characterization of
patterns with flow of arbitrary depth, based on the notion of influencing paths
and a simple rewriting system on the angles of the measurement. Our method
leads to insightful knowledge for constructing parallel circuits and as
applications, we demonstrate several constant and logarithmic depth circuits.
Furthermore, we prove a logarithmic separation in terms of quantum depth
between the quantum circuit model and the measurement-based model.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 18:39:53 GMT"
}
] | 2012-02-22T00:00:00 | [
[
"Broadbent",
"Anne",
""
],
[
"Kashefi",
"Elham",
""
]
] |
0704.1737 | Denis Vasilyev | Denis V. Vasilyev, Ivan V. Sokolov, and Eugene S. Polzik | Quantum memory for images - a quantum hologram | 5 pages, 3 figures | Phys. Rev. A 77, 020302(R) (2008) | 10.1103/PhysRevA.77.020302 | null | quant-ph | null | Matter-light quantum interface and quantum memory for light are important
ingredients of quantum information protocols, such as quantum networks,
distributed quantum computation, etc. In this Letter we present a spatially
multimode scheme for quantum memory for light, which we call a quantum
hologram. Our approach uses a multi-atom ensemble which has been shown to be
efficient for a single spatial mode quantum memory. Due to the multi-atom
nature of the ensemble it is capable of storing many spatial modes, a feature
critical for the present proposal. A quantum hologram has a higher storage
capacity compared to a classical hologram, and is capable of storing quantum
features of an image, such as multimode superposition and entangled quantum
states, something that a standard hologram is unable to achieve. Due to optical
parallelism, the information capacity of the quantum hologram will obviously
exceed that of a single-mode scheme.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:33:16 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Sep 2007 10:43:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Vasilyev",
"Denis V.",
""
],
[
"Sokolov",
"Ivan V.",
""
],
[
"Polzik",
"Eugene S.",
""
]
] |
0704.1738 | Marco Patriarca | A. Chakraborti, M. Patriarca, and M.S. Santhanam | Financial time-series analysis: A brief overview | 16 pages, 7 figures, submitted for publication in the Proceedings
Volume of the International Workshop "Econophys-Kolkata III", Saha Institute
of Nuclear Physics, March 12-15, 2007 | null | 10.1007/978-88-470-0665-2_4 | null | q-fin.ST physics.soc-ph | null | Prices of commodities or assets produce what is called time-series. Different
kinds of financial time-series have been recorded and studied for decades.
Nowadays, all transactions on a financial market are recorded, leading to a
huge amount of data available, either for free in the Internet or commercially.
Financial time-series analysis is of great interest to practitioners as well as
to theoreticians, for making inferences and predictions. Furthermore, the
stochastic uncertainties inherent in financial time-series and the theory
needed to deal with them make the subject especially interesting not only to
economists, but also to statisticians and physicists. While it would be a
formidable task to make an exhaustive review on the topic, with this review we
try to give a flavor of some of its aspects.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:34:10 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Chakraborti",
"A.",
""
],
[
"Patriarca",
"M.",
""
],
[
"Santhanam",
"M. S.",
""
]
] |
0704.1739 | Celine Roucairol | Marco Hien, Celine Roucairol | Integral representations for solutions of exponential Gauss-Manin
systems | 16 pages | null | null | null | math.AG | null | Let f,g be two algebraically independent regular functions from the smooth
affine complex variety U to the affine line. The associated exponential
Gauss-Manin systems on the affine line are defined to be the cohomology sheaves
of the direct image of the exponential differential system $\mathcal{O}_U e^g $
with respect to f. We prove that its holomorphic solutions admit
representations in terms of period integrals over topological chains with
possibly closed support and with rapid decay condition.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:36:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hien",
"Marco",
""
],
[
"Roucairol",
"Celine",
""
]
] |
0704.1740 | Mikhail Rogal | S. Moch and M. Rogal | Charged current deep-inelastic scattering at three loops | 29 pages, 6 figures | Nucl.Phys.B782:51-78,2007 | 10.1016/j.nuclphysb.2007.05.008 | DESY 07-002, SFB/CPP-07-01 | hep-ph | null | We derive for deep-inelastic neutrino-proton scattering in the combination nu
P - nubar P the perturbative QCD corrections to three loops for the charged
current structure functions F_2, F_L and F_3. In leading twist approximation we
calculate the first five odd-integer Mellin moments in the case of F_2 and F_L
and the first five even-integer moments in the case of F_3. As a new result we
obtain the coefficient functions to O(alpha_s^3) while the corresponding
anomalous dimensions agree with known results in the literature.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:11:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Moch",
"S.",
""
],
[
"Rogal",
"M.",
""
]
] |
0704.1741 | Peter Jonker | P.G. Jonker, J.J.M. in 't Zand, M. Mendez, M. van der Klis | Detection of a 1258 Hz high-amplitude kilohertz quasi-periodic
oscillation in the ultra-compact X-ray binary 1A 1246-588 | 4 pages, 3 figures, accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.378:1187-1190,2007 | 10.1111/j.1365-2966.2007.11854.x | null | astro-ph | null | We have observed the ultra-compact low-mass X-ray binary (LMXB) 1A 1246-588
with the Rossi X-ray Timing Explorer (RXTE). In this manuscript we report the
discovery of a kilohertz quasi-periodic oscillation (QPO) in 1A 1246-588. The
kilohertz QPO was only detected when the source was in a soft high-flux state
reminiscent of the lower banana branch in atoll sources. Only one kilohertz QPO
peak is detected at a relatively high frequency of 1258+-2 Hz and at a single
trial significance of more than 7 sigma. Kilohertz QPOs with a higher frequency
have only been found on two occasions in 4U 0614+09. Furthermore, the frequency
is higher than that found for the lower kilohertz QPO in any source, strongly
suggesting that the QPO is the upper of the kilohertz QPO pair often found in
LMXBs. The full-width at half maximum is 25+-4 Hz, making the coherence the
highest found for an upper kilohertz QPO. From a distance estimate of ~6 kpc
from a radius expansion burst we derive that 1A 1246-588 is at a persistent
flux of ~0.2-0.3 per cent of the Eddington flux, hence 1A 1246-588 is one of
the weakest LMXBs for which a kilohertz QPO has been detected. The
root-mean-square (rms) amplitude in the 5-60 keV band is 27+-3 per cent, this
is the highest for any kilohertz QPO source so far, in line with the general
anti-correlation between source luminosity and rms amplitude of the kilohertz
QPO peak identified before. Using the X-ray spectral information we produce a
colour-colour diagram. The source behaviour in this diagram provides further
evidence for the atoll nature of the source.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:42:31 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Jonker",
"P. G.",
""
],
[
"Zand",
"J. J. M. in 't",
""
],
[
"Mendez",
"M.",
""
],
[
"van der Klis",
"M.",
""
]
] |
0704.1742 | Tomas Dohnal | Tomas Dohnal and Dmitry Pelinovsky | Surface gap solitons at a nonlinearity interface | 23 pages, 6 figures, 3 tables corrections in v.2: sign error in the
energy functional on p.3; discussion of the symmetries of Bloch functions on
p. 5-6 corrected; derivative symbol missing in (3.5) and in the formula for
\mu below (3.6) | null | 10.1137/060676751 | null | nlin.PS physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate existence of waves localized at the interface of two nonlinear
periodic media with different coefficients of the cubic nonlinearity via the
one-dimensional Gross--Pitaevsky equation. We call these waves the surface gap
solitons (SGS). In the case of smooth symmetric periodic potentials, we study
analytically bifurcations of SGS's from standard gap solitons and determine
numerically the maximal jump of the nonlinearity coefficient allowing for the
SGS existence. We show that the maximal jump vanishes near the thresholds of
bifurcations of gap solitons. In the case of continuous potentials with a jump
in the first derivative at the interface, we develop a homotopy method of
continuation of SGS families from the solution obtained via gluing of parts of
the standard gap solitons and study existence of SGS's in the photonic band
gaps. We explain the termination of the SGS families in the interior points of
the band gaps from the bifurcation of linear bound states in the continuous
non-smooth potentials.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:55:45 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Apr 2009 16:29:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dohnal",
"Tomas",
""
],
[
"Pelinovsky",
"Dmitry",
""
]
] |
0704.1743 | Osamu Nakamura | Masataka Fukugita, Osamu Nakamura, Sadanori Okamura, Naoki Yasuda,
John C. Barentine, Jon Brinkmann, James E. Gunn, Mike Harvanek, Takashi
Ichikawa, Robert H. Lupton, Donald P. Schneider, Michael A. Strauss, Donald
G. York | A Catalogue of Morphologically Classified Galaxies from the Sloan
Digital Sky Survey: North Equatorial Region | Accepted for publication in Astronomical Journal. Table 2 available
at http://www.icrr.u-tokyo.ac.jp/~fukugita/MCGpaper/table2.txt | Astron.J.134:579-593,2007 | 10.1086/518962 | null | astro-ph | null | We present a catalogue of morphologically classified bright galaxies in the
north equatorial stripe (230 deg$^2$) derived from the Third Data Release of
the Sloan Digital Sky Survey (SDSS). Morphological classification is performed
by visual inspection of images in the $g$ band. The catalogue contains 2253
galaxies complete to a magnitude limit of $r=16$ after Galactic extinction
correction, selected from 2658 objects that are judged as extended in the
photometric catalogue in the same magnitude limit. 1866 galaxies in our
catalogue have spectroscopic information. A brief statistical analysis is
presented for the frequency of morphological types and mean colours in the
catalogue. A visual inspection of the images reveals that the rate of
interacting galaxies in the local Universe is approximately 1.5% in the
$r\le16$ sample. A verification is made for the photometric catalogue generated
by the SDSS, especially as to its bright end completeness.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:45:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fukugita",
"Masataka",
""
],
[
"Nakamura",
"Osamu",
""
],
[
"Okamura",
"Sadanori",
""
],
[
"Yasuda",
"Naoki",
""
],
[
"Barentine",
"John C.",
""
],
[
"Brinkmann",
"Jon",
""
],
[
"Gunn",
"James E.",
""
],
[
"Harvanek",
"Mike",
""
],
[
"Ichikawa",
"Takashi",
""
],
[
"Lupton",
"Robert H.",
""
],
[
"Schneider",
"Donald P.",
""
],
[
"Strauss",
"Michael A.",
""
],
[
"York",
"Donald G.",
""
]
] |
0704.1744 | Sergio Colafrancesco | P. Giommi, M. Capalbi, E. Cavazzuti, S. Colafrancesco, S. Cutini, D.
Gasparrini, E. Massaro, P. Padovani, M. Perri, S. Puccetti | Blazar surveys with WMAP and Swift | 3 pages, 3 figures, to appear in Proc. of the 1st GLAST Symposium,
Feb 5-8, 2007, Stanford, AIP, Eds. S. Ritz, P. F. Michelson, and C. Meegan | AIP Conf.Proc.921:32-36,2007 | 10.1063/1.2757262 | null | astro-ph | null | We present the preliminary results from two new surveys of blazars that have
direct implications on the GLAST detection of extragalactic sources from two
different perspectives: microwave selection and a combined deep X-ray/radio
selection. The first one is a 41 GHz flux-limited sample extracted from the
WMAP 3-yr catalog of microwave point sources. This is a statistically well
defined sample of about 200 blazars and radio galaxies, most of which are
expected to be detected by GLAST. The second one is a new deep survey of
Blazars selected among the radio sources that are spatially coincident with
serendipitous sources detected in deep X-ray images (0.3-10 keV) centered on
the Gamma Ray Bursts (GRB) discovered by the Swift satellite. This sample is
particularly interesting from a statistical viewpoint since a) it is unbiased
as GRBs explode at random positions in the sky, b) it is very deep in the X-ray
band (\fx \simgt $10^{-15}$ \ergs) with a position accuracy of a few
arc-seconds, c) it will cover a fairly large (20-30 square deg.) area of sky,
d) it includes all blazars with radio flux (1.4 GHz) larger than 10 mJy, making
it approximately two orders of magnitude deeper than the WMAP sample and about
one order of magnitude deeper than the deepest existing complete samples of
radio selected blazars, and e) it can be used to estimate the amount of
unresolved GLAST high latitude gamma-ray background and its anisotropy
spectrum.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 11:57:14 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Giommi",
"P.",
""
],
[
"Capalbi",
"M.",
""
],
[
"Cavazzuti",
"E.",
""
],
[
"Colafrancesco",
"S.",
""
],
[
"Cutini",
"S.",
""
],
[
"Gasparrini",
"D.",
""
],
[
"Massaro",
"E.",
""
],
[
"Padovani",
"P.",
""
],
[
"Perri",
"M.",
""
],
[
"Puccetti",
"S.",
""
]
] |
0704.1745 | V. Gogohia | V. Gogokhia | I. The mass gap and solution of the quark confinement problem in QCD | no tables, no figures, 14 pages | null | null | null | hep-ph hep-th | null | Using the previously derived confining gluon propagator, the corresponding
system of equations determining the quark propagator is derived. The system of
equations consists of the Schwinger-Dyson equation for the quark propagator
itself, which includes the zero momentum transfer quark-gluon vertex. It is
complemented by the Slavnov-Taylor identity for this vertex. The quark equation
depends explicitly on the mass gap, determining the scale of the truly
nonperturbative dynamics in the QCD ground state. The obtained system of
equations is manifestly gauge-invariant, i.e., does not depend explicitly on
the gauge-fixing parameter. It is also free from all the types of the
perturbative contributions ("contaminations"), which may appear at the
fundamental quark-gluon level.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:01:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gogokhia",
"V.",
""
]
] |
0704.1746 | Parthasarathi Mitra | Bhramar Chatterjee, A. Ghosh and P. Mitra | Tunnelling from black holes and tunnelling into white holes | REVTeX, 6 pages; changed interpretation for white hole spacetimes; to
appear in PLB | Phys.Lett.B661:307-311,2008 | 10.1016/j.physletb.2008.02.034 | null | hep-th gr-qc | null | Hawking radiation is nowadays being understood as tunnelling through black
hole horizons. Here, the extension of the Hamilton-Jacobi approach to
tunnelling for non-rotating and rotating black holes in different non-singular
coordinate systems not only confirms this quantum emission from black holes but
also reveals the new phenomenon of absorption into white holes by quantum
mechanical tunnelling. The role of a boundary condition of total absorption or
emission is also clarified.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:06:44 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Apr 2007 11:45:19 GMT"
},
{
"version": "v3",
"created": "Thu, 17 May 2007 09:07:14 GMT"
},
{
"version": "v4",
"created": "Wed, 20 Feb 2008 05:02:07 GMT"
}
] | 2010-04-29T00:00:00 | [
[
"Chatterjee",
"Bhramar",
""
],
[
"Ghosh",
"A.",
""
],
[
"Mitra",
"P.",
""
]
] |
0704.1747 | Iskander Aliev | Iskander Aliev and Chris Smyth | Solving algebraic equations in roots of unity | Since the last submission we became aware of several important
results in the area. The paper is now changed according to the current state
of the art | null | null | null | math.NT math.AG | null | This paper is devoted to finding solutions of polynomial equations in roots
of unity. It was conjectured by S. Lang and proved by M. Laurent that all such
solutions can be described in terms of a finite number of parametric families
called maximal torsion cosets. We obtain new explicit upper bounds for the
number of maximal torsion cosets on an algebraic subvariety of the complex
algebraic $n$-torus ${\mathbb G}_{\rm m}^n$. In contrast to earlier works that
give the bounds of polynomial growth in the maximum total degree of defining
polynomials, the proofs of our results are constructive. This allows us to
obtain a new algorithm for determining maximal torsion cosets on an algebraic
subvariety of ${\mathbb G}_{\rm m}^n$.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:22:43 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Apr 2007 14:30:54 GMT"
},
{
"version": "v3",
"created": "Fri, 1 Feb 2008 13:21:30 GMT"
}
] | 2008-02-01T00:00:00 | [
[
"Aliev",
"Iskander",
""
],
[
"Smyth",
"Chris",
""
]
] |
0704.1748 | Frank Schweitzer | Markus M. Geipel | Self-Organization applied to Dynamic Network Layout | Text revision and figures improved in v.2. See http://www.sg.ethz.ch
for more info and examples | International Journal of Modern Physics C vol. 18, no. 10 (2007),
pp. 1537-1549 | 10.1142/S0129183107011558 | null | physics.comp-ph cs.DS nlin.AO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As networks and their structure have become a major field of research, a
strong demand for network visualization has emerged. We address this challenge
by formalizing the well established spring layout in terms of dynamic
equations. We thus open up the design space for new algorithms. Drawing from
the knowledge of systems design, we derive a layout algorithm that remedies
several drawbacks of the original spring layout. This new algorithm relies on
the balancing of two antagonistic forces. We thus call it {\em arf} for
"attractive and repulsive forces". It is, as we claim, particularly suited for
a dynamic layout of smaller networks ($n < 10^3$). We back this claim with
several application examples from on going complex systems research.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:45:28 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Apr 2007 13:21:55 GMT"
},
{
"version": "v3",
"created": "Sun, 7 Sep 2008 12:46:19 GMT"
},
{
"version": "v4",
"created": "Mon, 24 Nov 2008 18:35:59 GMT"
},
{
"version": "v5",
"created": "Tue, 20 Jan 2009 14:58:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Geipel",
"Markus M.",
""
]
] |
0704.1749 | Steffen Mieske | S. Mieske, M. Rejkuba, S. Bagnulo, C. Izzo, G. Marconi | VIMOS total transmission profiles for broad-band filters | 5 pages, 3 figures, to appear in the proceedings of the ESO
instrument calibration workshop 2007, Springer Verlag series "ESO
Astrophysics Symposia", eds. F. Kerber & A. Kaufer | null | 10.1007/978-3-540-76963-7_7 | null | astro-ph | null | VIMOS is a wide-field imager and spectrograph mounted on UT3 at the
VLT, whose FOV consists of four 7'x8' quadrants. Here we present the
measurements of total transmission profiles -- i.e. the throughput of telescope
+ instrument -- for the broad band filters U, B, V, R, I, and z for each of its
four quadrants. Those measurements can also be downloaded from the public VIMOS
web-page. The transmission profiles are compared with previous estimates from
the VIMOS consortium.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:36:42 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Mieske",
"S.",
""
],
[
"Rejkuba",
"M.",
""
],
[
"Bagnulo",
"S.",
""
],
[
"Izzo",
"C.",
""
],
[
"Marconi",
"G.",
""
]
] |
0704.1750 | Ekaterina Evstigneeva | E.A. Evstigneeva, M.J. Drinkwater, R. Jurek, P. Firth, J.B. Jones,
M.D. Gregg, S. Phillipps | Searches for Ultra-Compact Dwarf Galaxies in Galaxy Groups | 8 pages, 2 figures, accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.378:1036-1042,2007 | 10.1111/j.1365-2966.2007.11856.x | null | astro-ph | null | We present the results of a search for ultra-compact dwarf galaxies (UCDs) in
six different galaxy groups: Dorado, NGC1400, NGC0681, NGC4038, NGC4697 and
NGC5084. We searched in the apparent magnitude range 17.5 < b_j < 20.5 (except
NGC5084: 19.2 < b_j < 21.0). We found 1 definite plus 2 possible UCD candidates
in the Dorado group and 2 possible UCD candidates in the NGC1400 group. No UCDs
were found in the other groups. We compared these results with predicted
luminosities of UCDs in the groups according to the hypothesis that UCDs are
globular clusters formed in galaxies. The theoretical predictions broadly agree
with the observational results, but deeper surveys are needed to fully test the
predictions.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:38:45 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Evstigneeva",
"E. A.",
""
],
[
"Drinkwater",
"M. J.",
""
],
[
"Jurek",
"R.",
""
],
[
"Firth",
"P.",
""
],
[
"Jones",
"J. B.",
""
],
[
"Gregg",
"M. D.",
""
],
[
"Phillipps",
"S.",
""
]
] |
0704.1751 | Olivier Rioul | Olivier Rioul | Information Theoretic Proofs of Entropy Power Inequalities | submitted for publication in the IEEE Transactions on Information
Theory, revised version | null | 10.1109/TIT.2010.2090193 | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While most useful information theoretic inequalities can be deduced from the
basic properties of entropy or mutual information, up to now Shannon's entropy
power inequality (EPI) is an exception: Existing information theoretic proofs
of the EPI hinge on representations of differential entropy using either Fisher
information or minimum mean-square error (MMSE), which are derived from de
Bruijn's identity. In this paper, we first present an unified view of these
proofs, showing that they share two essential ingredients: 1) a data processing
argument applied to a covariance-preserving linear transformation; 2) an
integration over a path of a continuous Gaussian perturbation. Using these
ingredients, we develop a new and brief proof of the EPI through a mutual
information inequality, which replaces Stam and Blachman's Fisher information
inequality (FII) and an inequality for MMSE by Guo, Shamai and Verd\'u used in
earlier proofs. The result has the advantage of being very simple in that it
relies only on the basic properties of mutual information. These ideas are then
generalized to various extended versions of the EPI: Zamir and Feder's
generalized EPI for linear transformations of the random variables, Takano and
Johnson's EPI for dependent variables, Liu and Viswanath's
covariance-constrained EPI, and Costa's concavity inequality for the entropy
power.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:42:07 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Aug 2010 10:41:34 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Rioul",
"Olivier",
""
]
] |
0704.1752 | Galina L. Klimchitskaya | E.V. Blagov, G.L. Klimchitskaya, V.M. Mostepanenko | Van der Waals interaction between a microparticle and a single-wall
carbon nanotube | 16 pages, 5 figures, to appear in Physical Review B | Phys. Rev. B, v.75, N23, 235413-(1-8), 2007 | 10.1103/PhysRevB.75.235413 | null | cond-mat.mtrl-sci quant-ph | null | The Lifshitz-type formulas describing the free energy and the force of the
van der Waals interaction between an atom (molecule) and a single-wall carbon
nanotube are obtained. The single-wall nanotube is considered as a cylindrical
sheet carrying a two-dimensional free electron gas with appropriate boundary
conditions on the electromagnetic field. The obtained formulas are used to
calculate the van der Waals free energy and force between a hydrogen atom
(molecule) and single-wall carbon nanotubes of different radia. Comparison
studies of the van der Waals interaction of hydrogen atoms with single- and
multi-wall carbon nanotubes show that depending on atom-nanotube separation
distance the idealization of graphite dielectric permittivity is already
applicable to nanotubes with only two or three walls.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:54:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Blagov",
"E. V.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] |
0704.1753 | Buisseret Fabien Mr | F. Buisseret, C. Semay | Relativistic corrections for two- and three-body flux tube model | 10 pages; v2 accepted for publication (minor changes) | Phys.Rev.D76:017501,2007 | 10.1103/PhysRevD.76.017501 | null | hep-ph | null | We generalize the relativistic flux tube model for arbitrary two- or
three-body systems. The spin-independent and spin-dependent contributions of
the flux tube to the total Hamiltonian are computed in perturbation. In
particular, we show that the spin-dependent part exhibits a universal
spin-orbit form: It does not depend on the nature of the confined particles.
The general equations we present, being well-defined for light particles, can
thus be applied to usual as well as exotic hadrons such as hybrid mesons and
glueballs.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:56:52 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 14:41:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Buisseret",
"F.",
""
],
[
"Semay",
"C.",
""
]
] |
0704.1754 | Amir Kalev | A. Kalev and I. Hen | The No-Broadcasting Theorem and its Classical Counterpart | 4 pages | null | 10.1103/PhysRevLett.100.210502 | null | quant-ph | null | Although it is widely accepted that `no-broadcasting' -- the nonclonability
of quantum information -- is a fundamental principle of quantum mechanics, an
impossibility theorem for the broadcasting of general density matrices has not
yet been formulated. In this paper, we present a general proof for the
no-broadcasting theorem, which applies to arbitrary density matrices. The proof
relies on entropic considerations, and as such can also be directly linked to
its classical counterpart, which applies to probabilistic distributions of
statistical ensembles.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 12:59:53 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Nov 2007 15:14:25 GMT"
},
{
"version": "v3",
"created": "Fri, 2 May 2008 15:49:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kalev",
"A.",
""
],
[
"Hen",
"I.",
""
]
] |
0704.1755 | Lingaraj Sahu | Debashish Goswami and Lingaraj Sahu | Quantum random walks and vanishing of the second Hochschild cohomology | null | null | 10.1007/s11005-008-0233-z | null | math.OA | null | Given a conditionally completely positive map $\mathcal L$ on a unital
$\ast$-algebra $\A$, we find an interesting connection between the second
Hochschild cohomology of $\A$ with coefficients in the bimodule $E_{\mathcal
L}=\B^a(\A \oplus M)$ of adjointable maps, where $M$ is the GNS bimodule of
$\mathcal L$, and the possibility of constructing a quantum random walk (in the
sense of \cite{AP,LP,L,KBS}) corresponding to $\mathcal L$.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 13:00:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Goswami",
"Debashish",
""
],
[
"Sahu",
"Lingaraj",
""
]
] |
0704.1756 | Jose M. Martin-Garcia | Jose M. Martin-Garcia, Renato Portugal, Leon R. U. Manssur | The Invar Tensor Package | Accepted in Computer Physics Communications. Package can be
downloaded from http://metric.iem.csic.es/Martin-Garcia/xAct/Invar/
(Mathematica version) or http://www.lncc.br/~portugal/Invar.html (Maple
version) | Comp. Phys. Commun. 177 (2007) 640-648 | 10.1016/j.cpc.2007.05.015 | null | cs.SC gr-qc hep-th | null | The Invar package is introduced, a fast manipulator of generic scalar
polynomial expressions formed from the Riemann tensor of a four-dimensional
metric-compatible connection. The package can maximally simplify any polynomial
containing tensor products of up to seven Riemann tensors within seconds. It
has been implemented both in Mathematica and Maple algebraic systems.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 13:03:59 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Martin-Garcia",
"Jose M.",
""
],
[
"Portugal",
"Renato",
""
],
[
"Manssur",
"Leon R. U.",
""
]
] |
0704.1757 | Andrea Macrina | Andrea Macrina | Towards a Gauge Invariant Scattering Theory of Cylindrical Gravitational
Waves | MSc Thesis, University of Bern (2002) | null | null | null | gr-qc | null | In this account we investigate an asymptotically flat space-time geometry. In
particular, we focus on a pure gravity model with cylindrical symmetry where no
matter fields are included. The Einstein-Rosen metric is introduced and the
corresponding Einstein equations are solved. By use of the ADM formalism, we
derive the observables of the cylindrical gravitational waves. We conclude with
an analysis of the algebra of the observables of the Einstein-Rosen waves.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 13:25:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Macrina",
"Andrea",
""
]
] |
0704.1758 | George Poulipoulis | G. N. Throumoulopoulos, H. Tasso and G. Poulipoulis | On axisymmetric MHD equilibria with incompressible flows under side
conditions | 19 pages, 1 table, 6 figures | null | null | null | physics.plasm-ph | null | Axisymmetric equilibria with incompressible flows of arbitrary direction are
studied in the framework of magnetohydrodynamics under a variety of physically
relevant side conditions. To this end a set of pertinent non-linear ODEs are
transformed to quasilinear ones and the respective initial value problem is
solved numerically with appropriately determined initial values near the
magnetic axis. Several equilibria are then constructed surface by surface. The
non field aligned flow results in novel configurations with a single magnetic
axis, toroidal shell configurations in which the plasma is confined within a
couple of magnetic surfaces and double shell-like configurations. In addition,
the flow affects the elongation and triangularity of the magnetic surfaces.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 13:25:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Throumoulopoulos",
"G. N.",
""
],
[
"Tasso",
"H.",
""
],
[
"Poulipoulis",
"G.",
""
]
] |
0704.1759 | Corina Calinescu | Corina Calinescu, James Lepowsky, Antun Milas | Vertex-algebraic structure of the principal subspaces of certain
A_1^(1)-modules, I: level one case | 20 pages. To appear in International J. of Math | Int.J.Math.19:71-92,2008 | 10.1142/S0129167X08004571 | null | math.QA hep-th math.RT | null | This is the first in a series of papers in which we study vertex-algebraic
structure of Feigin-Stoyanovsky's principal subspaces associated to standard
modules for both untwisted and twisted affine Lie algebras. A key idea is to
prove suitable presentations of principal subspaces, without using bases or
even ``small'' spanning sets of these spaces. In this paper we prove
presentations of the principal subspaces of the basic A_1^(1)-modules. These
convenient presentations were previously used in work of
Capparelli-Lepowsky-Milas for the purpose of obtaining the classical
Rogers-Ramanujan recursion for the graded dimensions of the principal
subspaces.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 13:30:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Calinescu",
"Corina",
""
],
[
"Lepowsky",
"James",
""
],
[
"Milas",
"Antun",
""
]
] |
0704.1760 | Pieter van Dokkum | Pieter van Dokkum, Ryan Quadri | Galaxy Evolution and Environment | To appear in the proceedings of the Cosmic Frontiers conference
(Durham, UK). 8 pages, 5 figures | null | null | null | astro-ph | null | The properties of galaxies are strongly correlated with their environment,
with red galaxies dominating galaxy clusters and blue galaxies dominating the
general field. However, not all field galaxies are young: studies of the
colors, line strengths, and M/L ratios of massive early-type galaxies at
0<z<1.3 show that the most massive galaxies do not seem to care about their
surroundings, and have very similar ages irrespective of their environment.
There is good evidence that the growth of these galaxies does continue longer
in the field than in clusters, via (nearly) dissipationless mergers of already
old galaxies. These results are consistent with predictions of recent galaxy
formation models, which incorporate AGN feedback to suppress star formation in
the most massive halos. Systematic studies of the relation of galaxies with
their environment beyond z=1 are difficult, and still somewhat contradictory.
Intriguingly both the DEEP2 and VVDS surveys find that the color-density
relation disappears at z~1.3, unfortunately just at the point where both
surveys become highly incomplete. On the other hand, clustering studies at
z~2.5 have shown that red galaxies cluster more strongly than blue galaxies,
implying that the color-density relation was already in place at that redshift.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:44:07 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"van Dokkum",
"Pieter",
""
],
[
"Quadri",
"Ryan",
""
]
] |
0704.1761 | Eric R. Sharpe | R. Donagi, E. Sharpe | GLSM's for partial flag manifolds | 57 pp, LaTeX; v3: refs added, material on weighted Grassmannians
added | J.Geom.Phys.58:1662-1692,2008 | 10.1016/j.geomphys.2008.07.010 | null | hep-th | null | In this paper we outline some aspects of nonabelian gauged linear sigma
models. First, we review how partial flag manifolds (generalizing
Grassmannians) are described physically by nonabelian gauged linear sigma
models, paying attention to realizations of tangent bundles and other aspects
pertinent to (0,2) models. Second, we review constructions of Calabi-Yau
complete intersections within such flag manifolds, and properties of the gauged
linear sigma models. We discuss a number of examples of nonabelian GLSM's in
which the Kahler phases are not birational, and in which at least one phase is
realized in some fashion other than as a complete intersection, extending
previous work of Hori-Tong. We also review an example of an abelian GLSM
exhibiting the same phenomenon. We tentatively identify the mathematical
relationship between such non-birational phases, as examples of Kuznetsov's
homological projective duality. Finally, we discuss linear sigma model moduli
spaces in these gauged linear sigma models. We argue that the moduli spaces
being realized physically by these GLSM's are precisely Quot and hyperquot
schemes, as one would expect mathematically.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:06:31 GMT"
},
{
"version": "v2",
"created": "Sat, 14 Apr 2007 02:15:29 GMT"
},
{
"version": "v3",
"created": "Thu, 30 Aug 2007 23:56:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Donagi",
"R.",
""
],
[
"Sharpe",
"E.",
""
]
] |
0704.1762 | Sean Brittain | E. L. Gibb (1), K. A. Van Brunt (1), S. D. Brittain (2), T. W. Rettig
(3) ((1) University of Missouri - St. Louis, (2) Clemson University, (3)
University of Notre Dame) | Warm HCN, C2H2, and CO in the disk of GV Tau | 23 pages, 6 figures, accepted by ApJ | Astrophys.J.660:1572-1579,2007 | 10.1086/513502 | null | astro-ph | null | We present the first high-resolution, ground-based observations of HCN and
C2H2 toward the T Tauri binary star system GV Tau. We detected strong
absorption due to HCN nu_3 and weak C2H2 (nu_3 and nu_2 + (nu_4 + nu_5)^0_+)
absorption toward the primary (GV Tau S) but not the infrared companion. We
also report CO column densities and rotational temperatures, and present
abundances relative to CO of HCN/CO ~0.6% and C2H2/CO ~1.2% and an upper limit
for CH4/CO < 0.37% toward GV Tau S. Neither HCN nor C2H2 were detected toward
the infrared companion and results suggest that abundances may differ between
the two sources.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:14:52 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Gibb",
"E. L.",
""
],
[
"Van Brunt",
"K. A.",
""
],
[
"Brittain",
"S. D.",
""
],
[
"Rettig",
"T. W.",
""
]
] |
0704.1763 | Ilia Solov'yov | Ilia A. Solov'yov, Walter Greiner | Towards understanding of birds magnetoreceptor mechanism | 10 pages, 4 figures | null | null | null | physics.bio-ph | null | In the present letter we suggest a new theoretical model for a quantitative
description of the magnetoreception mechanism in birds. The considered
mechanism involves two types of iron minerals (magnetite and maghemite) which
were found in subcellular compartments within sensory dendrites of the upper
beak of several bird species. The analysis of forces acting between the iron
particles shows that the orientation of the external geomagnetic field can
significantly change the probability of the mechanosensitive ion channels
opening and closing. The performed theoretical analysis shows that the
suggested magnetoreceptor system might be a sensitive biological magnetometer
providing an essential part of the magnetic map for navigation.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:21:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Solov'yov",
"Ilia A.",
""
],
[
"Greiner",
"Walter",
""
]
] |
0704.1764 | Scott Guthery Dr. | Scott B. Guthery | Another Riemann-Farey Computation | 6 pages, 2 figures | null | null | null | math.GM | null | Another approach to constructing an upper bound for the Riemann-Farey sum is
described.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:28:42 GMT"
},
{
"version": "v2",
"created": "Tue, 15 May 2007 19:53:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Guthery",
"Scott B.",
""
]
] |
0704.1765 | Anna Sajina | Anna Sajina (1), Lin Yan (1), Lee Armus (1), Phil Choi (2), Dario
Fadda (3), George Helou (1), Henrik Spoon (4)((1)Spitzer Science Center, (2)
Pomona College, (3) Herschel Science Center, (4) Cornell) | Spitzer Mid-Infrared Spectroscopy of Infrared Luminous Galaxies at z~2
II: Diagnostics | 60 pages, 15 figures, accepted for publication in ApJ | Astrophys.J.664:713-737,2007 | 10.1086/519446 | null | astro-ph | null | We present mid-IR spectral decomposition of a sample of 48 Spitzer-selected
ULIRGs spanning z~1-3 and likely L_IR~10^12-10^13Lsun. Our study aims at
quantifying the star-formation and AGN processes in these sources which recent
results suggest have evolved strongly between the observed epoch and today. To
do this, we study the mid-IR contribution of PAH emission, continuum, and
extinction. About 3/4 of our sample are continuum- (i.e. AGN) dominated
sources, but ~60% of these show PAH emission, suggesting the presence of
star-formation activity. These sources have redder mid-IR colors than typical
optically-selected quasars. About 25% of our sample have strong PAH emission,
but none are likely to be pure starbursts as reflected in their relatively high
5um hot dust continua. However, their steep 30um-to-14um slopes suggest that
star-formation might dominate the total infrared luminosity. Six of our z~2
sources have EW6.2>~0.3um and L_14um>~10^12Lsun (implying L_IR>~10^13Lsun). At
these luminosities, such high EW6.2 ULIRGs do not exist in the local Universe.
We find a median optical depth at 9.7um of <tau_9.7>=1.4. This is consistent
with local IRAS-selected ULIRGs, but differs from early results on
SCUBA-selected z~2 ULIRGs. Similar to local ULIRGs about 25% of our sample show
extreme obscuration (tau_9.7>~3) suggesting buried nuclei. In general, we find
that our sources are similar to local ULIRGs, but are an order of magnitude
more luminous. It is not clear whether our z~2 ULIRGs are simply scaled-up
versions of local ULIRGs, or subject to fundamentally different physical
processes.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:36:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Sajina",
"Anna",
""
],
[
"Yan",
"Lin",
""
],
[
"Armus",
"Lee",
""
],
[
"Choi",
"Phil",
""
],
[
"Fadda",
"Dario",
""
],
[
"Helou",
"George",
""
],
[
"Spoon",
"Henrik",
""
]
] |
0704.1766 | Oscar Esquivel | O. Esquivel, B. Fuchs | Jeans instability of a galactic disk embedded in a live dark halo | 3 pages, 1 figure, accepted by Astron. Astrophys | null | 10.1051/0004-6361:20077372 | null | astro-ph | null | We investigate the Jeans instability of a galactic disk embedded in a
dynamically responsive dark halo. It is shown that the disk-halo system becomes
nominally Jeans unstable. On small scales the instability is suppressed, if the
Toomre stability index Q_T is higher than a certain threshold, but on large
scales the Jeans instability sets invariably in. However, using a simple
self-consistent disk-halo model it is demonstrated that this occurs on scales
which are much larger than the system so that this is indeed only a nominal
effect. From a practical point of view the Jeans instability of galactic disks
is not affected by a live dark halo.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:37:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Esquivel",
"O.",
""
],
[
"Fuchs",
"B.",
""
]
] |
0704.1767 | Markus Mugrauer | M. Mugrauer, A. Seifahrt, R. Neuhaeuser | The multiplicity of planet host stars - New low-mass companions to
planet host stars | MNRAS accepted, 8 pages, 6 figures, and 1 table | Mon.Not.Roy.Astron.Soc.378:1328-1334,2007 | 10.1111/j.1365-2966.2007.11858.x | null | astro-ph | null | We present new results from our ongoing multiplicity study of exoplanet host
stars, carried out with the infrared camera SofI at ESO-NTT. We have identified
new low mass companions to the planet host stars HD101930 and HD65216.
HD101930AB is a wide binary systems composed of the planet host star HD101930A
and its companion HD101930B which is a M0 to M1 dwarf with a mass of about
0.7Msun separated from the primary by ~73arcsec (2200AU projected separation).
HD65216 forms a hierarchical triple system, with a projected separation of
253AU (angular separation of about 7arcsec) between the planet host star
HD65216A and its close binary companion HD65216BC, whose two components are
separated by only ~0.17arcsec (6AU of projected separation). Two VLT-NACO
images separated by 3 years confirm that this system is co-moving to the planet
host star. The infrared photometry of HD65216B and C is consistent with a M7 to
M8 (0.089Msun), and a L2 to L3 dwarf (0.078Msun), respectively, both close to
the sub-stellar limit. An infrared spectrum with VLT-ISAAC of the pair
HD65216BC, even though not resolved spatially, confirms this late spectral
type. Furthermore, we present H- and K-band ISAAC infrared spectra of HD16141B,
the recently detected co-moving companion of the planet host star HD16141A. The
infrared spectroscopy as well as the apparent infrared photometry of HD16141B
are both fully consistent with a M2 to M3 dwarf located at the distance of the
planet host star.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:19:57 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Mugrauer",
"M.",
""
],
[
"Seifahrt",
"A.",
""
],
[
"Neuhaeuser",
"R.",
""
]
] |
0704.1768 | Enrique ter Horst A | Henryk Gzyl, German Molina, Enrique ter Horst | Assessment and Propagation of Input Uncertainty in Tree-based Option
Pricing Models | 39 pages, 21 figures | null | null | null | cs.CE cs.GT | null | This paper aims to provide a practical example on the assessment and
propagation of input uncertainty for option pricing when using tree-based
methods. Input uncertainty is propagated into output uncertainty, reflecting
that option prices are as unknown as the inputs they are based on. Option
pricing formulas are tools whose validity is conditional not only on how close
the model represents reality, but also on the quality of the inputs they use,
and those inputs are usually not observable. We provide three alternative
frameworks to calibrate option pricing tree models, propagating parameter
uncertainty into the resulting option prices. We finally compare our methods
with classical calibration-based results assuming that there is no options
market established. These methods can be applied to pricing of instruments for
which there is not an options market, as well as a methodological tool to
account for parameter and model uncertainty in theoretical option pricing.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:48:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gzyl",
"Henryk",
""
],
[
"Molina",
"German",
""
],
[
"ter Horst",
"Enrique",
""
]
] |
0704.1769 | Ralf Metzler | Michael A. Lomholt, Irwin M. Zaid, Ralf Metzler | Subdiffusion and weak ergodicity breaking in the presence of a reactive
boundary | 4 pages, 1 figure, REVTeX4, accepted to Phys Rev Lett, some typos
corrected | Phys. Rev. Lett. 98, 200603 (2007) | 10.1103/PhysRevLett.98.200603 | null | cond-mat.stat-mech cond-mat.soft | null | We derive the boundary condition for a subdiffusive particle interacting with
a reactive boundary with finite reaction rate. Molecular crowding conditions,
that are found to cause subdiffusion of larger molecules in biological cells,
are shown to effect long-tailed distributions with identical exponent for both
the unbinding times from the boundary to the bulk and the rebinding times from
the bulk. This causes a weak ergodicity breaking: typically, an individual
particle either stays bound or remains in the bulk for very long times. We
discuss why this may be beneficial for in vivo gene regulation by DNA-binding
proteins, whose typical concentrations are nanomolar
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:56:57 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 13:27:03 GMT"
}
] | 2008-06-02T00:00:00 | [
[
"Lomholt",
"Michael A.",
""
],
[
"Zaid",
"Irwin M.",
""
],
[
"Metzler",
"Ralf",
""
]
] |
0704.1770 | Laura V. Sales | L. V. Sales, J. F. Navarro, M. G. Abadi and M. Steinmetz | Satellites of Simulated Galaxies: survival, merging, and their relation
to the dark and stellar halos | 13 pages, 11 figures, MNRAS in press. Accepted version with minor
changes. Version with high resolution figures available at:
http://www.astro.uvic.ca/~lsales/SatPapers/SatPapers.html | Mon.Not.Roy.Astron.Soc.379:1464-1474,2007 | 10.1111/j.1365-2966.2007.12024.x | null | astro-ph | null | We study the population of satellite galaxies formed in a suite of
N-body/gasdynamical simulations of galaxy formation in a LCDM universe. We find
little spatial or kinematic bias between the dark matter and the satellite
population. The velocity dispersion of the satellites is a good indicator of
the virial velocity of the halo: \sigma_{sat}/V_{vir}=0.9 +/- 0.2. Applied to
the Milky Way and M31 this gives V_{vir}^{MW}=109 +/- 22$ km/s and
V_{vir}^{M31} = 138 +/- 35 km/s, respectively, substantially lower than the
rotation speed of their disk components. The detailed kinematics of simulated
satellites and dark matter are also in good agreement. By contrast, the stellar
halo of the simulated galaxies is kinematically and spatially distinct from the
population of surviving satellites. This is because the survival of a satellite
depends on mass and on time of accretion; surviving satellites are biased
toward low-mass systems that have been recently accreted by the galaxy. Our
results support recent proposals for the origin of the systematic differences
between stars in the Galactic halo and in Galactic satellites: the elusive
``building blocks'' of the Milky Way stellar halo were on average more massive,
and were accreted (and disrupted) earlier than the population of dwarfs that
has survived self-bound until the present.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:56:44 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 16:02:05 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Sales",
"L. V.",
""
],
[
"Navarro",
"J. F.",
""
],
[
"Abadi",
"M. G.",
""
],
[
"Steinmetz",
"M.",
""
]
] |
0704.1771 | Vasily E. Tarasov | Vasily E. Tarasov, George M. Zaslavsky | Fractional Generalization of Kac Integral | 16 pages, LaTeX | Communications in Nonlinear Science and Numerical Simulation.
Vol.13. No.2. (2008) 248-258 | 10.1016/j.cnsns.2007.04.020 | null | math-ph cond-mat.other math.MP nlin.CD physics.class-ph | null | Generalization of the Kac integral and Kac method for paths measure based on
the Levy distribution has been used to derive fractional diffusion equation.
Application to nonlinear fractional Ginzburg-Landau equation is discussed.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 14:58:46 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 14:32:36 GMT"
}
] | 2015-03-12T00:00:00 | [
[
"Tarasov",
"Vasily E.",
""
],
[
"Zaslavsky",
"George M.",
""
]
] |
0704.1772 | Anisa Bajkova | Vadim V. Bobylev, and Anisa T. Bajkova | Analysis of the Velocity Field of F and G Dwarfs in the Solar
Neighborhood as a Function of Age | 13 pages, 6 figures, 3 tables | Astron.Rep.51:327-381,2007 | 10.1134/S1063772907050034 | null | astro-ph | null | The space velocities from the catalog of Nordstrom et al. (2004) are used to
trace variations of a number of kinematic parameters of single F and G dwarfs
as a function of their age. The vertex deviation of disk stars increases from
7+- 1 to 15+-2 degrees as the mean age decreases from 4.3 to 1.5 Gyr. The
two-dimensional velocity distributions in the UV, UW, and VW planes are
analyzed. The evolution of the main peaks in the velocity distributions can be
followed to an average age of approximately 9 Gyr. We find that: (1) in the
distributions of the UV velocity components, stars of different types are
concentrated toward several stable peaks (the Hyades, Pleiades, and Sirius
Cluster), suggesting that the stars belonging to these formations did not form
simultaneously; (2) the peak associated with the Hyades Cluster dominates in
all age intervals; and (3) the Hyades peak is strongest for stars with an
average age of 1.5 Gyr, suggesting that this peak contains a considerable
fraction of stars from the Hyades cluster. The age dependences of the kinematic
parameters exhibit a break near 4.5 Gyr, which can be explained as an effect of
the different contributions of stars of the thin and thick disks. The Stromberg
relation yields a solar LSR velocity of V_{\odot LSR} = (8.7, 6.2, 7.2)+- (0.5,
2.2, 0.8) km/s.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:03:23 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bobylev",
"Vadim V.",
""
],
[
"Bajkova",
"Anisa T.",
""
]
] |
0704.1773 | Laura V. Sales | L. V. Sales, J. F. Navarro, M. G. Abadi and M. Steinmetz | Cosmic M\'enage \`a Trois: The Origin of Satellite Galaxies On Extreme
Orbits | 10 pages, 6 figures, MNRAS in press. Accepted version with minor
changes. Version with high resolution figures available at:
http://www.astro.uvic.ca/~lsales/SatPapers/SatPapers.html | Mon.Not.Roy.Astron.Soc.379:1475-1483,2007 | 10.1111/j.1365-2966.2007.12026.x | null | astro-ph | null | We examine the orbits of satellite galaxies identified in a suite of
N-body/gasdynamical simulations of the formation of $L_*$ galaxies in a LCDM
universe. Most satellites follow conventional orbits; after turning around,
they accrete into their host halo and settle on orbits whose apocentric radii
are steadily eroded by dynamical friction. However, a number of outliers are
also present, we find that ~1/3 of satellites identified at $z=0$ are on
unorthodox orbits, with apocenters that exceed their turnaround radii. This
population of satellites on extreme orbits consists typically of the faint
member of a satellite pair that has been ejected onto a highly-energetic orbit
during its first approach to the primary. Since the concurrent accretion of
multiple satellite systems is a defining feature of hierarchical models of
galaxy formation, we speculate that this three-body ejection mechanism may be
the origin of (i) some of the newly discovered high-speed satellites around M31
(such as Andromeda XIV); (ii) some of the distant fast-receding Local Group
members, such as Leo I; and (iii) the oddly isolated dwarf spheroidals Cetus
and Tucana in the outskirts of the Local Group. Our results suggest that care
must be exercised when using the orbits of the most weakly bound satellites to
place constraints on the total mass of the Local Group.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:06:16 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 15:07:52 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Sales",
"L. V.",
""
],
[
"Navarro",
"J. F.",
""
],
[
"Abadi",
"M. G.",
""
],
[
"Steinmetz",
"M.",
""
]
] |
0704.1774 | Francesco Pederiva | S. Gandolfi, F. Pederiva, S. Fantoni, K.E. Schmidt | Auxiliary Field Diffusion Monte Carlo calculation of nuclei with A<40
with tensor interactions | 4 pages, no figures | Phys.Rev.Lett.99:022507,2007 | 10.1103/PhysRevLett.99.022507 | null | nucl-th | null | We calculate the ground-state energy of 4He, 8He, 16O, and 40Ca using the
auxiliary field diffusion Monte Carlo method in the fixed phase approximation
and the Argonne v6' interaction which includes a tensor force. Comparison of
our light nuclei results to those of Green's function Monte Carlo calculations
shows the accuracy of our method for both open and closed shell nuclei. We also
apply it to 16O and 40Ca to show that quantum Monte Carlo methods are now
applicable to larger nuclei.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:06:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gandolfi",
"S.",
""
],
[
"Pederiva",
"F.",
""
],
[
"Fantoni",
"S.",
""
],
[
"Schmidt",
"K. E.",
""
]
] |
0704.1775 | Lam Yu | Lam H. Yu, Christopher D. Zangmeister, James G. Kushmerick | Origin of Discrepancies in Inelastic Electron Tunneling Spectra of
Molecular Junctions | 4 pages, 4 figures accepted for publication in Physical Review
Letters | null | 10.1103/PhysRevLett.98.206803 | null | cond-mat.mes-hall cond-mat.other | null | We report inelastic electron tunneling spectroscopy (IETS) of multilayer
molecular junctions with and without incorporated metal nano-particles. The
incorporation of metal nanoparticles into our devices leads to enhanced IET
intensity and a modified line-shape for some vibrational modes. The enhancement
and line-shape modification are both the result of a low lying hybrid metal
nanoparticle-molecule electronic level. These observations explain the apparent
discrepancy between earlier IETS measurements of alkane thiolate junctions by
Kushmerick \emph{et al.} [Nano Lett. \textbf{4}, 639 (2004)] and Wang \emph{et
al.} [Nano Lett. \textbf{4}, 643 (2004)].
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:11:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yu",
"Lam H.",
""
],
[
"Zangmeister",
"Christopher D.",
""
],
[
"Kushmerick",
"James G.",
""
]
] |
0704.1776 | Joerg Junkersfeld | H. van Pee, O. Bartholomy, V. Crede (for the CB-ELSA Collaboration) | Photoproduction of pi0-mesons off protons from the Delta(1232) region to
E(gamma) = 3 GeV | 17 pages, 17 figures | Eur.Phys.J.A31:61-77,2007 | 10.1140/epja/i2006-10160-3 | null | nucl-ex | null | Photoproduction of pi0 mesons was studied with the Crystal-Barrel detector at
ELSA for incident energies from 300 MeV to 3 GeV. Differential cross sections d
sigma /d Omega, d sigma/d t, and the total cross section are presented. For
E(gamma) < 3 GeV, the angular distributions agree well with the SAID
parametrization. At photon energies above 1.5 GeV, a strong forward peaking
indicates t-channel exchange to be the dominant process. The rapid variations
of the cross section with energy and angle indicate production of resonances.
An interpretation of the data within the Bonn-Gatchina partial wave analysis is
briefly discussed.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:12:37 GMT"
}
] | 2019-08-14T00:00:00 | [
[
"van Pee",
"H.",
"",
"for the CB-ELSA Collaboration"
],
[
"Bartholomy",
"O.",
"",
"for the CB-ELSA Collaboration"
],
[
"Crede",
"V.",
"",
"for the CB-ELSA Collaboration"
]
] |
0704.1777 | Hyun-Chul Kim | H.-Ch. Kim, Gh.-S. Yang, and K. Goeke | Magnetic and axial-vector transitions of the baryon antidecuplet | 8 pages, 5 figures, Talk given at the Yukawa International Seminar
(YKIS) 2006, "New frontiers in QCD", Kyoto, Japan, 20 Nov. - 8 Dec. 2006 | Prog.Theor.Phys.Suppl.168:62-69,2007 | 10.1143/PTPS.168.62 | PNU-NTG-03/2007 | hep-ph | null | We report the recent results of the magnetic transitions and axial-vector
transitions of the baryon antidecuplet within the framework of the chiral
quark-soliton model. The dynamical model parameters are fixed by experimental
data for the magnetic moments of the baryon octet, for the hyperon semileptonic
decay constants, and for the singlet axial-vector constant. The transition
magnetic moments $\mu_{\Lambda\Sigma}$ and $\mu_{N\Delta}$ are well reproduced
and other octet-decuplet and octet-antidecuplet transitions are predicted. In
particular, the present calculation of $\mu_{\Sigma\Sigma^*}$ is found to be
below the upper bound $0.82\mu_N$ that the SELEX collaboration measured very
recently. The results explains consistently the recent findings of a new $N^*$
resonance from the GRAAL and Tohoku LNS group. We also obtain the transition
axial-vector constants for the $\Theta^+\to KN$ from which the decay width of
the $\Theta^{+}$ pentaquark baryon is determined as a function of the
pion-nucleon sigma term $\Sigma_{\pi N}$. We investigate the dependence of the
decay width of the $\Theta^{+}$ on the $g_{A}^{(0)}$, with the $g_{A}^{(0)}$
varied within the range of the experimental uncertainty. We show that a small
decay width of the $\Theta^{+}\to KN$, i.e. $\Gamma_{\Theta KN} \leq 1$ MeV, is
compatible with the values of all known semileptonic decays with the generally
accepted value of $g_{A}^{(0)} \approx 0.3$ for the proton.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:12:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"H. -Ch.",
""
],
[
"Yang",
"Gh. -S.",
""
],
[
"Goeke",
"K.",
""
]
] |
0704.1778 | Jonathon Peterson | Jonathon Peterson, Ofer Zeitouni | Quenched limits for transient, zero speed one-dimensional random walk in
random environment | Published in at http://dx.doi.org/10.1214/08-AOP399 the Annals of
Probability (http://www.imstat.org/aop/) by the Institute of Mathematical
Statistics (http://www.imstat.org) | Annals of Probability 2009, Vol. 37, No. 1, 143-188 | 10.1214/08-AOP399 | IMS-AOP-AOP399 | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a nearest-neighbor, one dimensional random walk
$\{X_n\}_{n\geq0}$ in a random i.i.d. environment, in the regime where the walk
is transient but with zero speed, so that $X_n$ is of order $n^s$ for some
$s<1$. Under the quenched law (i.e., conditioned on the environment), we show
that no limit laws are possible: There exist sequences $\{n_k\}$ and $\{x_k\}$
depending on the environment only, such that $X_{n_k}-x_k=o(\log n_k)^2$ (a
localized regime). On the other hand, there exist sequences $\{t_m\}$ and
$\{s_m\}$ depending on the environment only, such that $\log s_m/\log t_m\to
s<1$ and $P_{\omega}(X_{t_m}/s_m\leq x)\to1/2$ for all $x>0$ and $\to0$ for
$x\leq0$ (a spread out regime).
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:12:46 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Feb 2011 12:02:32 GMT"
}
] | 2011-02-24T00:00:00 | [
[
"Peterson",
"Jonathon",
""
],
[
"Zeitouni",
"Ofer",
""
]
] |
0704.1779 | Simonetta Abenda | S. Abenda, T. Grava | Reciprocal transformations and flat metrics on Hurwitz spaces | 25 pages | J. Phys. A: Math. Theor. 40 (2007) 10769-10790 | 10.1088/1751-8113/40/35/004 | null | nlin.SI math-ph math.MP | null | We consider hydrodynamic systems which possess a local Hamiltonian structure
of Dubrovin-Novikov type. To such a system there are also associated an
infinite number of nonlocal Hamiltonian structures. We give necessary and
sufficient conditions so that, after a nonlinear transformation of the
independent variables, the reciprocal system still possesses a local
Hamiltonian structure of Dubrovin-Novikov type. We show that, under our
hypotheses, bi-hamiltonicity is preserved by the reciprocal transformation.
Finally we apply such results to reciprocal systems of genus g Whitham-KdV
modulation equations.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:15:01 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 18:13:02 GMT"
}
] | 2009-02-26T00:00:00 | [
[
"Abenda",
"S.",
""
],
[
"Grava",
"T.",
""
]
] |
0704.1780 | Amornrat Aungwerojwit | A. Aungwerojwit, B. T. Gaensicke, P. Rodriguez-Gil, H.-J. Hagen, O.
Giannakis, C. Papadimitriou, C. Allende Prieto and D. Engels | HS1857+5144: A hot and young pre-cataclysmic variable | accepted for publication in A&A, 10 pages, 9 figures | null | 10.1051/0004-6361:20077276 | null | astro-ph | null | We report the discovery of a new white dwarf/M dwarf binary, HS1857+5144,
identified in the Hamburg Quasar Survey (HQS). Time-resolved optical
spectroscopy and photometry were carried out to determine the properties of
this new cataclysmic variable progenitor pre-CV). The light curves of
HS1857+5144 display a sinusoidal variation with a period of Porb=383.52 min and
peak-to-peak amplitudes of 0.7 mag and 1.1 mag in the B-band and R-band,
respectively. The large amplitude of the brightness variation results from a
reflection effect on the heated inner hemisphere of the companion star,
suggesting a very high temperature of the white dwarf. Our radial velocity
study confirms the photometric period as the orbital period of the system. A
model atmosphere fit to the spectrum of the white dwarf obtained at minimum
light provides limits to its mass and temperature of Mwd=~0.6-1.0 Msun and
Twd=~70000-100000 K, respectively. The detection of HeII 4686 absorption
classifies the primary star of HS1857+5144 as a DAO white dwarf. Combining the
results from our spectroscopy and photometry, we estimate the mass of the
companion star and the binary inclination to be Msec=~0.15-0.30 Msun and
i=~45-55 deg, respectively. We classify HS1857+5144 as one of the youngest
pre-CV known to date. The cooling age of the white dwarf suggests that the
present system has just emerged from a common envelope phase ~10^5 yr ago.
HS1857+5144 will start mass transfer within or below the 2-3h period gap.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:17:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aungwerojwit",
"A.",
""
],
[
"Gaensicke",
"B. T.",
""
],
[
"Rodriguez-Gil",
"P.",
""
],
[
"Hagen",
"H. -J.",
""
],
[
"Giannakis",
"O.",
""
],
[
"Papadimitriou",
"C.",
""
],
[
"Prieto",
"C. Allende",
""
],
[
"Engels",
"D.",
""
]
] |
0704.1781 | Angela Bonaccorso | G. Blanchon (INFN and Physics Department, Pisa), A. Bonaccorso (INFN
and Physics Department, Pisa), D.M. Brink (Oxford University), N. Vinh Mau
(IPN, Orsay) | $^{10}$Li spectrum from $^{11}$Li fragmentation | 15 pages, 4 figures, 3 tables. Accepted for publication in
Nucl.Phys.A | Nucl.Phys.A791:303-312,2007 | 10.1016/j.nuclphysa.2007.04.014 | null | nucl-th nucl-ex | null | A recently developed time dependent model for the excitation of a nucleon
from a bound state to a continuum resonant state in the system n+core is
applied to the study of the population of the low energy continuum of the
unbound $^{10}$Li system obtained from $^{11}$Li fragmentation. Comparison of
the model results to new data from the GSI laboratory suggests that the
reaction mechanism is dominated by final state effects rather than by the
sudden process, but for the population of the l=0 virtual state, in which case
the two mechanisms give almost identical results. There is also, for the first
time, a clear evidence for the population of a d$_{5/2}$ resonance in
$^{10}$Li.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:31:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Blanchon",
"G.",
"",
"INFN and Physics Department, Pisa"
],
[
"Bonaccorso",
"A.",
"",
"INFN\n and Physics Department, Pisa"
],
[
"Brink",
"D. M.",
"",
"Oxford University"
],
[
"Mau",
"N. Vinh",
"",
"IPN, Orsay"
]
] |
0704.1782 | Yossi Farjoun | Richard Ehrenborg and Yossi Farjoun | Asymptotics of the Euler number of bipartite graphs | 13 pages, 6 figure, submitted to JCTB | Advances in Applied Mathematics 44 (2010) 155--167 | 10.1016/j.aam.2009.05.002 | null | math.CO math.NA | null | We define the Euler number of a bipartite graph on $n$ vertices to be the
number of labelings of the vertices with $1,2,...,n$ such that the vertices
alternate in being local maxima and local minima. We reformulate the problem of
computing the Euler number of certain subgraphs of the Cartesian product of a
graph $G$ with the path $P_m$ in terms of self adjoint operators. The
asymptotic expansion of the Euler number is given in terms of the eigenvalues
of the associated operator. For two classes of graphs, the comb graphs and the
Cartesian product $P_2 \Box P_m$, we numerically solve the eigenvalue problem.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:34:43 GMT"
}
] | 2010-02-22T00:00:00 | [
[
"Ehrenborg",
"Richard",
""
],
[
"Farjoun",
"Yossi",
""
]
] |
0704.1783 | Francesco Santini | Stefano Bistarelli, Ugo Montanari, Francesca Rossi, Francesco Santini | Unicast and Multicast Qos Routing with Soft Constraint Logic Programming | 45 pages | null | null | null | cs.LO cs.AI cs.NI | null | We present a formal model to represent and solve the unicast/multicast
routing problem in networks with Quality of Service (QoS) requirements. To
attain this, first we translate the network adapting it to a weighted graph
(unicast) or and-or graph (multicast), where the weight on a connector
corresponds to the multidimensional cost of sending a packet on the related
network link: each component of the weights vector represents a different QoS
metric value (e.g. bandwidth, cost, delay, packet loss). The second step
consists in writing this graph as a program in Soft Constraint Logic
Programming (SCLP): the engine of this framework is then able to find the best
paths/trees by optimizing their costs and solving the constraints imposed on
them (e.g. delay < 40msec), thus finding a solution to QoS routing problems.
Moreover, c-semiring structures are a convenient tool to model QoS metrics. At
last, we provide an implementation of the framework over scale-free networks
and we suggest how the performance can be improved.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:53:44 GMT"
},
{
"version": "v2",
"created": "Sun, 29 Apr 2007 15:40:10 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Apr 2008 17:25:06 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Bistarelli",
"Stefano",
""
],
[
"Montanari",
"Ugo",
""
],
[
"Rossi",
"Francesca",
""
],
[
"Santini",
"Francesco",
""
]
] |
0704.1784 | Sergio Fabi | S.Fabi, B.Harms, G.Karatheodoris | Zero point energy on extra dimension: Noncommutative Torus | RevTeX4 | Phys.Rev.D76:065010,2007 | 10.1103/PhysRevD.76.065010 | null | hep-th | null | In this paper we calculate the zero point energy density experienced by
observers on M^4 due to a massless scalar field defined throughout M^4 x T^2_F,
where T^2_F are fuzzy extra dimensions. Using the Green's function approach we
calculate the energy density for the commutative torus and the fuzzy torus. We
calculate then the energy density for the fuzzy torus using the Hamiltonian
approach. Agreement is shown between Green's function and Hamiltonian
approaches.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:45:03 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Apr 2007 14:51:36 GMT"
},
{
"version": "v3",
"created": "Wed, 25 Apr 2007 16:40:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fabi",
"S.",
""
],
[
"Harms",
"B.",
""
],
[
"Karatheodoris",
"G.",
""
]
] |
0704.1785 | Alexei Larionov | A.B. Larionov, O. Buss, K. Gallmeister and U. Mosel | Three-body collisions in Boltzmann-Uehling-Uhlenbeck theory | 26 pages, 9 figures, figures added, discussion extended, results not
changed, version accepted in Phys. Rev. C | Phys.Rev.C76:044909,2007 | 10.1103/PhysRevC.76.044909 | null | nucl-th | null | Aiming at a microscopic description of heavy ion collisions in the beam
energy region of about 10 A GeV, we extend the Giessen
Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model by including a relativistic
mean field, in-medium baryon-baryon cross sections and three-body collisions.
The model is then compared with experimental data for central Au+Au collisions
at 2-10 A GeV and central Pb+Pb collisions at 30 and 40 A GeV on the proton
rapidity spectra, the midrapidity yields of $\pi^+$, $K^\pm$ and
$(\Lambda+\Sigma^0)$, and the transverse mass spectra of $\pi^\pm$ and $K^\pm$.
The three-body collisions increase the inverse slope parameters of the hadron
$m_\perp$-spectra to a good agreement with the data.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:51:33 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Sep 2007 08:11:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Larionov",
"A. B.",
""
],
[
"Buss",
"O.",
""
],
[
"Gallmeister",
"K.",
""
],
[
"Mosel",
"U.",
""
]
] |
0704.1786 | Stefan Popescu | Stefan Popescu and Bernhard Rothenstein | Learning more from the Lorentz transformations | very interesting new approach to Lorenz transformations | null | null | null | physics.gen-ph | null | Admitting the validity of Lorentz transformations for the space as time
coordinates of the same event we derive their differential form in order to
underline the correct prerequisites for the application of time and length
contraction or dilation effects. Furthermore we quantify the simultaneity error
occurring in the relativity theory. Having done this, we analyse the root cause
of these effects and identify it with a finite phase velocity associated with
the moving frame. We define this phase velocity by analogy to the de Broglie
wave associated with a moving particle. Based on this construct we demonstrate
that the phase of the de Broglie waves further extended for stationary
particles is a relativistic invariant being the same for all corresponding
observers. Also the phase of the electromagnetic waves transporting energy at
light speed is a relativistic invariant. Therefore the universe and its matter
/ energy may be seen as a superposition of waves propagating such that their
phase is the same for all corresponding observers. The wave phase may replace
the time as an invariant and universal reference.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 15:56:39 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 15:20:29 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Popescu",
"Stefan",
""
],
[
"Rothenstein",
"Bernhard",
""
]
] |
0704.1787 | Roi Baer | Roi Baer | On the Mapping of Time-Dependent Densities onto Potentials in Quantum
Mechanics | null | null | 10.1063/1.2822124 | null | cond-mat.other cond-mat.dis-nn | null | The mapping of time-dependent densities on potentials in quantum mechanics is
critically examined. The issue is of significance ever since Runge and Gross
(Phys. Rev. Lett. 52, 997 (1984)) established the uniqueness of the mapping,
forming a theoretical basis for time-dependent density functional theory. We
argue that besides existence (so called v-representability) and uniqueness
there is an important question of stability and chaos. Studying a 2-level
system we find innocent, almost constant densities that cannot be constructed
from any potential (non-existence). We further show via a Lyapunov analysis
that the mapping of densities on potentials has chaotic regions in this case.
In real space the situation is more subtle. V-representability is formally
assured but the mapping is often chaotic making the actual construction of the
potential almost impossible. The chaotic nature of the mapping, studied for the
first time here, has serious consequences regarding the possibility of using
TDDFT in real-time settings.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 17:56:09 GMT"
},
{
"version": "v2",
"created": "Sat, 28 Apr 2007 08:01:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Baer",
"Roi",
""
]
] |
0704.1788 | Bipin singh Koranga | Bipin Singh Koranga and S. Uma Sankar (Indian Institute of Technology
Bombay) | New Jarlskog determinant from Physics above the GUT Scal | 11 pages and 2 figures | Electron.J.Theor.Phys.6:229,2009 | null | null | hep-ph | null | We study the Planck scale effects on Jarlskog determinant. Quantum
gravitational (Planck scale) effects lead to an effective SU(2)_{L}\times U(1)
invariant dimension-5 Lagrangian involving neutrino and Higgs fields, which
gives rise to additional terms in neutrino mass matrix on electroweak symmetry
breaking. We assume that gravitational interaction is flavor blind and compute
the Jarlskog determinant due to the Planck scale effects. In the case of
neutrino sector, the strength of CP violation is measured by Jarlskog
determinant. In this paper, we assume CP violation arise from Planck scale
effects. We applied our approach to study Jarlskog determinant due to the
Planck scale effects.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:03:45 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Koranga",
"Bipin Singh",
"",
"Indian Institute of Technology\n Bombay"
],
[
"Sankar",
"S. Uma",
"",
"Indian Institute of Technology\n Bombay"
]
] |
0704.1789 | Kevin Ford | Kevin Ford | Generalized Smirnov statistics and the distribution of prime factors | 10 pages. Minor corrections; increase in the range of variables in
the theorems and corollary. To appear in Functiones et Approximatio
Commentarii Mathematici | Funct. Approx. Comm. Math. XXXVII.I (2007), 119-129. | null | null | math.NT math.PR | null | We apply recent bounds of the author (math.PR/0609224) for generalized
Smirnov statistics to the distribution of integers whose prime factors satisfy
certain systems of inequalities.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:10:30 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Jun 2007 07:16:12 GMT"
}
] | 2008-01-09T00:00:00 | [
[
"Ford",
"Kevin",
""
]
] |
0704.1790 | Nino Boccara | Nino Boccara | Models of Opinion Formation: Influence of Opinion Leaders | 20 pages, 9 figures | null | 10.1142/S0129183108011954 | null | nlin.AO | null | This paper studies the evolution of the distribution of opinions in a
population of individuals in which there exist two distinct subgroups of
highly-committed, well-connected opinion leaders endowed with a strong
convincing power. Each individual, located at a vertex of a directed graph, is
characterized by her name, the list of people she is interacting with, her
level of awareness, and her opinion. Various temporal evolutions according to
different local rules are compared in order to find under which conditions the
formation of strongly polarized subgroups, each adopting the opinion of one of
the two groups of opinion leaders, is favored.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:06:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Boccara",
"Nino",
""
]
] |
0704.1791 | Dennis Sivers Dr. | Dennis Sivers | Chiral Mechanisms Leading to Orbital Quantum Structures in the Nucleon | 28 pages, no figures | null | null | null | hep-ph | null | Color confinement and chiral symmetry specify some important territory for
the study of hadronic physics. Any hadron can be defined as a color-singlet
composite system of qurks and gluons, the fundamental fields of qcd, while the
landscape of the hadronic spectrum is dominated by the fact that two quark
flavors, u and d, are characterized by masses small compared to the fundamental
scale of this theory. Measurements sensitive to the orbital angular momenta of
the color constituents of the nucleon display the interplay of chiral dynamics
and confinement in a unique manner. This pageant can be explored by an
evaluation, within the context of the Georgi-Manohar chiral quark model, of the
normalization of the orbital structure functions and the normalization of the
Boer-Mulders functions for different quark flavors. The resolution structures
in the chiral quark model represent an evaluation of Collins functions for a
confined system defined by the quantum numbers of the nucleon in the
constituent quark model. The orbital structure functions for antiquarks can
also be specified within the basic framework of this approach while the
normalization of the gluon orbital structure function requires some additional
assumptions.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:10:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sivers",
"Dennis",
""
]
] |
0704.1792 | Charles Creffield | C.E. Creffield | Quantum control and entanglement using periodic driving fields | 4 pages, 4 eps figures. V2: minor changes, this version to be
published in PRL | Phys. Rev. Lett. 99, 110501 (2007). | 10.1103/PhysRevLett.99.110501 | null | cond-mat.other | null | We propose a scheme for producing directed motion in a lattice system by
applying a periodic driving potential. By controlling the dynamics by means of
the effect known as coherent destruction of tunneling, we demonstrate a novel
ratchet-like effect that enables particles to be coherently manipulated and
steered without requiring local control. Entanglement between particles can
also be controllably generated, which points to the attractive possibility of
using these technique for quantum information processing.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:33:50 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Aug 2007 13:43:54 GMT"
}
] | 2007-09-13T00:00:00 | [
[
"Creffield",
"C. E.",
""
]
] |
0704.1793 | Misha Katsnelson | A. Fasolino, J. H. Los and M. I. Katsnelson | Intrinsic ripples in graphene | 14 pages, 6 figures | Nature Materials 6, 858-861 (2007) | 10.1038/nmat2011 | null | cond-mat.mtrl-sci cond-mat.mes-hall | null | The stability of two-dimensional (2D) layers and membranes is subject of a
long standing theoretical debate. According to the so called Mermin-Wagner
theorem, long wavelength fluctuations destroy the long-range order for 2D
crystals. Similarly, 2D membranes embedded in a 3D space have a tendency to be
crumpled. These dangerous fluctuations can, however, be suppressed by
anharmonic coupling between bending and stretching modes making that a
two-dimensional membrane can exist but should present strong height
fluctuations. The discovery of graphene, the first truly 2D crystal and the
recent experimental observation of ripples in freely hanging graphene makes
these issues especially important. Beside the academic interest, understanding
the mechanisms of stability of graphene is crucial for understanding electronic
transport in this material that is attracting so much interest for its unusual
Dirac spectrum and electronic properties. Here we address the nature of these
height fluctuations by means of straightforward atomistic Monte Carlo
simulations based on a very accurate many-body interatomic potential for
carbon. We find that ripples spontaneously appear due to thermal fluctuations
with a size distribution peaked around 70 \AA which is compatible with
experimental findings (50-100 \AA) but not with the current understanding of
stability of flexible membranes. This unexpected result seems to be due to the
multiplicity of chemical bonding in carbon.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:38:30 GMT"
}
] | 2011-01-14T00:00:00 | [
[
"Fasolino",
"A.",
""
],
[
"Los",
"J. H.",
""
],
[
"Katsnelson",
"M. I.",
""
]
] |
0704.1794 | Bachtold | An. Gruneis, M.J. Esplandiu, D. Garcia-Sanchez, and A. Bachtold | Counting and manipulating single electrons using a carbon nanotube
transistor | 4 figures | Nano Lett. 7, 3766 (2007) | null | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | We report on the electric measurements of an individual Au nanoparticle with
an ultra-high contact resistance of about $10^{19} \Omega$. The high-impedance
measurements have been carried out by counting the electrons that are
transferred onto the particle. In order to do this, a carbon nanotube is used
as the electrode for the supply of electrons but also as the detector of the
charge transfer. Measurements using single-electron detection allow us to
determine the separation between the electron states in the Au nanoparticle,
which is about 4 meV, consistent with the charging energy of the particle.
Single-electron detection with nanotubes offers great promise for the study of
electron transfer in highly resistive molecular systems.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:40:25 GMT"
}
] | 2008-03-12T00:00:00 | [
[
"Gruneis",
"An.",
""
],
[
"Esplandiu",
"M. J.",
""
],
[
"Garcia-Sanchez",
"D.",
""
],
[
"Bachtold",
"A.",
""
]
] |
0704.1795 | Frederic Chapoton | Fr\'ed\'eric Chapoton (ICJ) | Le module dendriforme sur le groupe cyclique | 12 pages | null | null | null | math.QA | null | The structure of anticyclic operad on the Dendriform operad defines in
particular a matrix of finite order acting on the vector space spanned by
planar binary trees. We compute its characteristic polynomial and propose a
(compatible) conjecture for the characteristic polynomial of the Coxeter
transformation for the Tamari lattice, which is mostly a square root of this
matrix.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 16:58:28 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chapoton",
"Frédéric",
"",
"ICJ"
]
] |
0704.1796 | Ying Hu | Ying Hu (IRMAR), Jin Ma (Department of Mathematics), Shige Peng
(Institute of Mathematics), Song Yao (Department of Mathematics) | Representation Theorems for Quadratic ${\cal F}$-Consistent Nonlinear
Expectations | null | null | null | null | math.PR | null | In this paper we extend the notion of ``filtration-consistent nonlinear
expectation" (or "${\cal F}$-consistent nonlinear expectation") to the case
when it is allowed to be dominated by a $g$-expectation that may have a
quadratic growth. We show that for such a nonlinear expectation many
fundamental properties of a martingale can still make sense, including the
Doob-Meyer type decomposition theorem and the optional sampling theorem. More
importantly, we show that any quadratic ${\cal F}$-consistent nonlinear
expectation with a certain domination property must be a quadratic
$g$-expectation. The main contribution of this paper is the finding of the
domination condition to replace the one used in all the previous works, which
is no longer valid in the quadratic case. We also show that the representation
generator must be deterministic, continuous, and actually must be of the simple
form.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 17:03:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hu",
"Ying",
"",
"IRMAR"
],
[
"Ma",
"Jin",
"",
"Department of Mathematics"
],
[
"Peng",
"Shige",
"",
"Institute of Mathematics"
],
[
"Yao",
"Song",
"",
"Department of Mathematics"
]
] |
0704.1797 | Philippe Vergne | Kazuyuki Yagi (LaMCoS), Philippe Vergne (LaMCoS) | Film Thickness Changes in EHD Sliding Contacts Lubricated by a Fatty
Alcohol | null | Tribology Online 1, 1 (31/08/2006) 5-8 | null | null | physics.class-ph | null | This paper describes the appearance of abnormal film thickness features
formed in elastohydrodynamic contacts lubricated by a fatty alcohol.
Experiments were conducted by varying the slide to roll ratio between a steel
ball and a glass disk in a ball-on-disk type device. Lauric alcohol was used as
lubricant and film thickness was measured in the contact area by optical
interferometry. Experimental results showed that the film thickness
distributions under pure rolling conditions remained classical whereas the film
shape changed when the slide to roll ratio was increased. The thickness in the
central contact area increased and in the same time inlet and exit film
thicknesses were modified. In addition, the film shapes observed when the ball
surface was moving faster than the disk one and those obtained in the opposite
case were different, i.e. when opposite signs but equal absolute values of the
slide to roll ratio were applied.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 17:04:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Yagi",
"Kazuyuki",
"",
"LaMCoS"
],
[
"Vergne",
"Philippe",
"",
"LaMCoS"
]
] |
0704.1798 | Philippe Vergne | Scott Bair, Philippe Vergne (LaMCoS), Michel Querry (LaMCoS) | A unified shear-thinning treatment of both film thickness and traction
in EHD | null | Tribology Letters 18, 2 (01/02/2005) 145-152 | null | null | physics.class-ph | null | A conclusive demonstration has been provided that the nature of the
shear-thinning, that affects both film thickness and traction in EHL contacts,
follows the ordinary power-law rule that has been described by many empirical
models of which Carreau is but one example. This was accomplished by accurate
measurements in viscometers of the shear response of a PAO that possesses a
very low critical stress for shear-thinning and accurate measurements
in-contact of film thickness and traction under conditions which accentuate the
shear-thinning effect. The in-contact central film thickness and traction were
entirely predictable from the rheological properties obtained from viscometers
using simple calculations. These data should be invaluable to researchers
endeavoring to accurately simulate Hertz zone behavior since the shear-thinning
rheology is extensively characterized and accurate in-contact data are
available to test. In addition, a new model has been introduced that may be
useful for the rheological characterization of mixtures.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 17:04:56 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bair",
"Scott",
"",
"LaMCoS"
],
[
"Vergne",
"Philippe",
"",
"LaMCoS"
],
[
"Querry",
"Michel",
"",
"LaMCoS"
]
] |
0704.1799 | Philippe Vergne | Philippe Vergne (LaMCoS) | Super Low Traction under EHD and Mixed Lubrication Regimes | null | Superlubricity, Elsevier BV (Ed.) (31/03/2007) 429-445 | null | null | physics.class-ph | null | After the pioneered experimental works on superlubricity by Martin et al. on
MoS2 [1], Hirano et al. on tungsten and silicon [2] and the further
confirmation by Dienwiebel et al. on graphite [3], many groups around the word
investigated the occurrence of near frictionless sliding contacts. This large
mobilization of tribologists, material sciences specialists and physicists has
lead to emerging solutions involving new materials and coatings, the most
promising being carbon based like graphite, diamond, carbon composites or
diamond-like-carbons. Some of them are currently used in practical
applications. The situation is different especially in EHL: the highest
friction coefficients are close to 10% when traction fluids are involved, i.e.
fluids that have especially designed to transmit the highest friction, and they
vary within 3-6% for the rest of lubricants. The range of variation is
consequently very narrow and these typical values are really low compared to
those obtained in dry contacts: as a consequence the gain expected from a super
low traction regime in lubrication will be probably more limited, especially in
the case of experiments conducted at the meso or macro scales. This weak
perspective could be one explanation on the relatively low number of articles
in recent literature dealing with lubricated superlubricity in the above
conditions.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 17:05:21 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Vergne",
"Philippe",
"",
"LaMCoS"
]
] |
0704.1800 | MariaConcepcion Gonzalez-Garcia | M.C. Gonzalez-Garcia and Michele Maltoni | Phenomenology with Massive Neutrinos | 204 pages, 57 figures. All results updated with the new MINOS,
KamLAND and Borexino data. Three new sections added: nu magnetic moment, nu
decay, two sterile nu's. Many sections and bibliography expanded. Analysis
fully updated as of Fall 2007; for more recent results check
http://dark.ft.uam.es/~maltoni/neutrino/ | Phys.Rept.460:1-129,2008 | 10.1016/j.physrep.2007.12.004 | YITP-SB-07-14, UB-ECM-PF 07/08, IFT-UAM/CSIC-07-51 | hep-ph astro-ph hep-ex | null | The current status and some perspectives of the phenomenology of massive
neutrinos is reviewed. We start with the phenomenology of neutrino oscillations
in vacuum and in matter. We summarize the results of neutrino experiments using
solar, atmospheric, reactor and accelerator neutrino beams. We update the
leptonic parameters derived from the three-neutrino oscillation interpretation
of this data. We describe the method and present results on our understanding
of the solar and atmospheric neutrino fluxes by direct extraction from the
corresponding neutrino event rates. We present some tests of different forms of
new physics which induce new sources of leptonic flavor transitions in vacuum
and in matter which can be performed with the present neutrino data. The aim
and potential of future neutrino experiments and facilities to further advance
in these fronts is also briefly summarized. Last, the implications of the LSND
observations are discussed, and the status of extended models which could
accommodate all flavor-mixing signals is presented in the light of the recent
results from MiniBooNE.
| [
{
"version": "v1",
"created": "Fri, 13 Apr 2007 19:09:13 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Oct 2007 13:11:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Maltoni",
"Michele",
""
]
] |
Subsets and Splits