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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.3298 | Aranya Bhattacherjee Dr. | Aranya B Bhattacherjee | Bogoliubov spectrum of a cigar shaped Fermi superfluid in an optical
lattice at the BEC-BCS crossover | To appear in Journal of Physics B 2007 | Journal of physics B, vol. 40, 4453 (2007) | 10.1088/0953-4075/40/23/005 | null | cond-mat.stat-mech | null | We study the Bogoliubov spectrum of an elongated Fermi superfluid confined in
an one-dimensional superfluid along the Bose-Einstein-condensate
(BEC)-Bardeen-Cooper-Schrieffer (BCS) crossover. We derive analytic expressions
for the sound velocity, effective mass and the Bogoliubov excitation spectrum
of the axial quasiparticles long the crossover based on the hydrodynamic
theory. Our investigation reveal interesting signatures of BEC-BCS crossover in
an optical lattice which deserve experimental investigation.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 07:25:19 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jul 2007 14:57:54 GMT"
},
{
"version": "v3",
"created": "Mon, 22 Oct 2007 09:47:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bhattacherjee",
"Aranya B",
""
]
] |
0705.3299 | Dr. Kalobaran Maiti | Ravi Shankar Singh, V.R.R. Medicherla, and Kalobaran Maiti | Role of long range ferromagnetic order in the electronic structure of
Sr$_{1-x}$Ca$_x$RuO$_3$ | 2 Figure | null | null | null | cond-mat.str-el | null | We investigate the role of long range ferromagnetic order in the electronic
structure of Sr$_{1-x}$Ca$_x$RuO$_3$ using high resolution photoemission
spectroscopy. SrRuO$_3$ is a ferromagnetic metal but isostructural,
isoelectronic CaRuO$_3$ is an enhanced paramagnet. Surface spectra of CaRuO$_3$
exhibit temperature induced modifications. This is not significant in other
compositions. This may be attributed to the structural changes observed in
previous studies. Interestingly, the bulk spectra reveal unusual spectral
changes exhibiting large decrease in the coherent feature intensity
corresponding to only ferromagnetic samples, although the Ru moment is very
similar in all the compositions.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 07:36:34 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Singh",
"Ravi Shankar",
""
],
[
"Medicherla",
"V. R. R.",
""
],
[
"Maiti",
"Kalobaran",
""
]
] |
0705.3300 | Kazuyuki Omukai | K. Omukai (NAOJ) | Observational Characteristics of the First Protostellar Cores | To appear in PASJ vol.59 | null | 10.1093/pasj/59.3.589 | null | astro-ph | null | First protostellar cores are young stellar objects in the earliest
evolutionary stage. They are hydrostatic objects formed soon after the central
portions of star-forming cores become optically thick to dust emission. We
consider their characteristics in the emitted radiation, and discuss their
evolution with increasing mass of the cores. Particular attention is paid to
detailed radiative and chemical processes in the postshock relaxation layer
located at the surface of the core, where the majority of radiation is emitted.
Most of the radiation is originally emitted in the dust continuum in
mid-infrared wavelength (~10-30 micron), which reprocessed to far-infrared with
~100-200 micron. Although some fraction (~0.1) of the radiation energy is
emitted in the H2O lines at the accretion shock, most is absorbed and reemitted
in the dust continuum in the envelope. The H2O lines account for at most ~1/100
of the observed luminosity. If a cavity is present in the envelope due to
outflow or rotation, the dust and H2O line emission in the mid-infrared
wavelength from the shock can be observed directly, or as a reflection nebula.
Among forthcoming observational facillities, SPICA is the most suitable for
detecting either direct or processed radiation from first-core objects.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 07:31:18 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Omukai",
"K.",
"",
"NAOJ"
]
] |
0705.3301 | Frederic Robert | Hans-Christoph Grunau and Fr\'ed\'eric Robert | Positivity and almost positivity of biharmonic Green's functions under
Dirichlet boundary conditions | Updated version. To appear in "Archive for Rational Mechanics and
Analysis" | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general, for higher order elliptic equations and boundary value problems
like the biharmonic equation and the linear clamped plate boundary value
problem neither a maximum principle nor a comparison principle or --
equivalently -- a positivity preserving property is available. The problem is
rather involved since the clamped boundary conditions prevent the boundary
value problem {from} being reasonably written as a system of second order
boundary value problems.
It is shown that, on the other hand, for bounded smooth domains $\Omega
\subset\mathbb{R}^n$, the negative part of the corresponding Green's function
is "small" when compared with its singular positive part, provided $n\ge 3$.
Moreover, the biharmonic Green's function in balls $B\subset\mathbb{R}^n$
under Dirichlet (i.e. clamped) boundary conditions is known explicitly and is
positive. It has been known for some time that positivity is preserved under
small regular perturbations of the domain, if $n=2$. In the present paper, such
a stability result is proved for $n\ge 3$. Keywords: Biharmonic Green's
functions, positivity, almost positivity, blow-up procedure.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 07:37:50 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Mar 2008 22:52:24 GMT"
},
{
"version": "v3",
"created": "Thu, 15 Jan 2009 16:31:33 GMT"
},
{
"version": "v4",
"created": "Fri, 27 Feb 2009 10:01:43 GMT"
}
] | 2009-02-27T00:00:00 | [
[
"Grunau",
"Hans-Christoph",
""
],
[
"Robert",
"Frédéric",
""
]
] |
0705.3302 | Thomas Amthor | Thomas Amthor, Markus Reetz-Lamour, Christian Giese, and Matthias
Weidem\"uller | Modeling many-particle mechanical effects of an interacting Rydberg gas | null | null | 10.1103/PhysRevA.76.054702 | null | physics.atom-ph | null | In a recent work [Phys. Rev. Lett. 98, 023004 (2007)] we have investigated
the influence of attractive van der Waals interaction on the pair distribution
and Penning ionization dynamics of ultracold Rydberg gases. Here we extend this
description to atoms initially prepared in Rydberg states exhibiting repulsive
interaction. We present calculations based on a Monte Carlo algorithm to
simulate the dynamics of many atoms under the influence of both repulsive and
attractive longrange interatomic forces. Redistribution to nearby states
induced by black body radiation is taken into account, changing the effective
interaction potentials. The model agrees with experimental observations, where
the ionization rate is found to increase when the excitation laser is
blue-detuned from the atomic resonance.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 08:28:48 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Aug 2007 12:06:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Amthor",
"Thomas",
""
],
[
"Reetz-Lamour",
"Markus",
""
],
[
"Giese",
"Christian",
""
],
[
"Weidemüller",
"Matthias",
""
]
] |
0705.3303 | Julian Oberdisse | Julian Oberdisse (LCVN) | Adsorption and grafting on colloidal interfaces studied by scattering
techniques | null | Current Opinion in Colloid and Interface Science 12 (19/12/2006)
3-8 | 10.1016/j.cocis.2006.11.001 | null | cond-mat.soft | null | The adsorption of polymer and surfactant molecules onto colloidal particles
or droplets in solution can be characterized non-destructively by scattering
techniques. In a first part, the general framework of Dynamic Light Scattering,
Small Angle Neutron and X-ray Scattering for the determination of the structure
of adsorbed layers, and namely of the density profile, is presented. We then
review recent studies of layers of the model polymer poly(ethylene oxide), as
homopolymer or part of a block copolymer. In this field, scattering with
contrast variation has been shown to be a powerful tool to obtain a detailed
description of the layer structure. Adsorption of chemically more complex
systems, including polyelectrolytes, polymer complexes, grafted chains and
biomacromolecules are also discussed in this review, as well as surfactant
adsorption.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 08:29:10 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Oberdisse",
"Julian",
"",
"LCVN"
]
] |
0705.3304 | Pinaki Roy | T. Jana and P. Roy | Higher order intertwining approach to quasinormal modes | null | null | 10.1088/1751-8113/40/22/007 | null | gr-qc | null | Using higher order intertwining operators we obtain new exactly solvable
potentials admitting quasinormal mode (QNMs) solutions of the Klein-Gordon
equation. It is also shown that different potentials exhibiting QNMs can be
related through nonlinear supersymmetry.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 08:33:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jana",
"T.",
""
],
[
"Roy",
"P.",
""
]
] |
0705.3305 | Wouter Kager | Wouter Kager | Diffusion constants and martingales for senile random walks | 17 pages, LaTeX; the proof of Proposition 2.3 has been simplified,
and an error in the proof of Theorem 2.4 has been corrected | null | null | EURANDOM Report 2007-028 | math.PR | null | We derive diffusion constants and martingales for senile random walks with
the help of a time-change. We provide direct computations of the diffusion
constants for the time-changed walks. Alternatively, the values of these
constants can be derived from martingales associated with the time-changed
walks. Using an inverse time-change, the diffusion constants for senile random
walks are then obtained via these martingales. When the walks are diffusive,
weak convergence to Brownian motion can be shown using a martingale functional
limit theorem.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 08:47:19 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 11:34:26 GMT"
}
] | 2007-11-19T00:00:00 | [
[
"Kager",
"Wouter",
""
]
] |
0705.3306 | Vladimir Zhukovsky | O.G.Kharlanov and V.Ch.Zhukovsky | CPT and Lorentz violation effects in hydrogen-like atoms | 13 pages, 1 figure; (5.14) is corrected to conform to the
normalization convention for Laguerre polynomials adopted at present; minor
grammatical changes | J.Math.Phys.48:092302,2007 | 10.1063/1.2785123 | null | hep-th | null | Within the framework of Lorentz-violating extended electrodynamics, the Dirac
equation for a bound electron in an external electromagnetic field is
considered assuming the interaction with a CPT-odd axial vector background
$b_\mu$. The quasi-relativistic Hamiltonian is obtained using a $1/c$-series
expansion. Relativistic Dirac eigenstates in a spherically-symmetric potential
are found accurate up to the second order in $b_0$. $b_0$-induced CPT-odd
corrections to the electromagnetic dipole moment operators of a bound electron
are calculated that contribute to the anapole moment of the atomic orbital and
may cause a specific asymmetry of the angular distribution of the radiation of
a hydrogen atom.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 08:52:47 GMT"
},
{
"version": "v2",
"created": "Mon, 28 May 2007 13:24:46 GMT"
},
{
"version": "v3",
"created": "Mon, 22 Oct 2007 11:09:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kharlanov",
"O. G.",
""
],
[
"Zhukovsky",
"V. Ch.",
""
]
] |
0705.3307 | Gerhard Baur | G. Baur, S. Typel | Coulomb dissociation, a tool for nuclear astrophysics | 6 pages, contribution to Nuclear Physics in Astrophysics III, 26-31
March 2007, Dresden, Germany, typos corrected, accepted for publication in
J.Phys. G | J.Phys.G35:014003,2008; J.Phys.G35:014028,2008 | 10.1088/0954-3899/35/1/014003 10.1088/0954-3899/35/1/014028 | null | nucl-th nucl-ex | null | A short status report on Coulomb dissociation, an indirect method for nuclear
astrophysics is given. An analytically solvable approach to study
electromagnetic excitation in ^{11}Be, the archetype of a halo nucleus, is
proposed.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 08:52:48 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 07:56:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Baur",
"G.",
""
],
[
"Typel",
"S.",
""
]
] |
0705.3308 | Marten Wegkamp | Florentina Bunea, Alexandre Tsybakov, Marten Wegkamp | Sparsity oracle inequalities for the Lasso | Published at http://dx.doi.org/10.1214/07-EJS008 in the Electronic
Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Electronic Journal of Statistics 2007, Vol. 1, 169-194 | 10.1214/07-EJS008 | IMS-EJS-EJS_2007_8 | math.ST stat.TH | null | This paper studies oracle properties of $\ell_1$-penalized least squares in
nonparametric regression setting with random design. We show that the penalized
least squares estimator satisfies sparsity oracle inequalities, i.e., bounds in
terms of the number of non-zero components of the oracle vector. The results
are valid even when the dimension of the model is (much) larger than the sample
size and the regression matrix is not positive definite. They can be applied to
high-dimensional linear regression, to nonparametric adaptive regression
estimation and to the problem of aggregation of arbitrary estimators.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 08:53:38 GMT"
}
] | 2007-08-03T00:00:00 | [
[
"Bunea",
"Florentina",
""
],
[
"Tsybakov",
"Alexandre",
""
],
[
"Wegkamp",
"Marten",
""
]
] |
0705.3309 | Ryosuke Kadono | R. Kadono, S. Kuroiwa, J. Akimitsu, A. Koda, K. Ohishi, W. Higemoto,
S. Otani | Microscopic properties of vortex state in YB6 probed by muon spin
rotation | 10 pages, 9 figures | Phys. Rev. B 76, 094501 (2007). | 10.1103/PhysRevB.76.094501 | null | cond-mat.supr-con | null | Local magnetic field distribution B(r) in the mixed state of a boride
superconductor, YB6, is studied by muon spin rotation (muSR). A comparative
analysis using the modified London model and Ginzburg-Landau (GL) model
indicates that the GL model exhibits better agreement with muSR data at higher
fields, thereby demonstrating the importance of reproducing the field profile
near the vortex cores when the intervortex distance becomes closer to the GL
coherence length. The temperature and field dependence of magnetic penetration
depth ($\lambda$) does not show any hint of nonlocal effect nor of low-lying
quasiparticle excitation. This suggests that the strong coupling of electrons
to the rattling motion of Y ions in the boron cage suggested by bulk
measurements gives rise to a conventional superconductivity with isotropic
s-wave pairing. Taking account of the present result, a review is provided for
probing the anisotropy of superconducting order parameters by the slope of
$\lambda$ against field.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 08:54:58 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 00:34:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kadono",
"R.",
""
],
[
"Kuroiwa",
"S.",
""
],
[
"Akimitsu",
"J.",
""
],
[
"Koda",
"A.",
""
],
[
"Ohishi",
"K.",
""
],
[
"Higemoto",
"W.",
""
],
[
"Otani",
"S.",
""
]
] |
0705.3310 | Germano D'Abramo | Germano D'Abramo, Barbara D'Abramo | Probabilita` e Paradosso (Probability and Paradox) | Plain LaTeX, 9 pages, one figure. Text in Italian | Il Giornale di Fisica, VOL. XLV, N.4, Ott.-Dic. 2004 | 10.1393/gdf/i2004-10019-1 | null | math.HO | null | In this paper we present three simple applications of probability and
highlight and discuss their paradoxical flavour.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:01:54 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"D'Abramo",
"Germano",
""
],
[
"D'Abramo",
"Barbara",
""
]
] |
0705.3311 | Joseph Parker | J. D. Parker (1), M. J. Athanas (1), P. D. Barnes (1), S. Bart (2), B.
Bassalleck (3), R. Chrien (2), G. Diebold (1), G. B. Franklin (1), K.
Johnston (4), P. Pile (2), B. Quinn (1), F. Rozon (1), R. Sawafta (2), R. A.
Schumacher (1), R. Stearns (5), I. Sukaton (1), R. Sutter (2), J. J.
Szymanski (6), V. J. Zeps (1) ((1) Carnegie Mellon University, Pittsburgh,
USA, (2) Brookhaven National Laboratory, Upton, USA, (3) University of New
Mexico, Albuquerque, USA, (4) University of Houston, Houston, USA, (5) Vassar
College, Poughkeepsie, USA, (6) Indiana University Cyclotron Facility,
Bloomington, USA) | Weak decays of 4He-Lambda | 15 pages, 11 figures, published in PRC, revised content to match
published version | Phys.Rev.C76:035501,2007; Erratum-ibid.C75:039904,2007 | 10.1103/PhysRevC.76.035501 10.1103/PhysRevC.75.039904 | null | nucl-ex | null | We measured the lifetime and the mesonic and non-mesonic decay rates of the
4He-Lambda hypernucleus. The hypernuclei were created using a 750 MeV/c
momentum K- beam on a liquid 4He target by the reaction 4He(K-,pi-)4He-Lambda.
The 4He-Lambda lifetime was directly measured using protons from Lambda p -> n
p non-mesonic decay (also referred to as proton-stimulated decay) and was found
to have a value of tau = 245 +/- 24 ps. The mesonic decay rates were determined
from the observed numbers of pi-'s and pi0's as Gamma_pi-/Gamma_tot = 0.270 +/-
0.024 and Gamma_pi0/Gamma_tot = 0.564 +/- 0.036, respectively, and the values
of the proton- and neutron-stimulated decay rates were extracted as
Gamma_p/Gamma_tot = 0.169 +/- 0.019 and Gamma_n/Gamma_tot <= 0.032 (95% CL),
respectively. The effects of final-state interactions and possible 3-body
Lambda N N decay contributions were studied in the context of a simple model of
nucleon-stimulated decay. Nucleon-nucleon coincidence events were observed and
were used in the determination of the non-mesonic branching fractions. The
implications of the results of this analysis were considered for the empirical
Delta I = 1/2 rule and the decay rates of the 4H-Lambda hypernucleus.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:57:29 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Sep 2007 09:42:31 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Parker",
"J. D.",
""
],
[
"Athanas",
"M. J.",
""
],
[
"Barnes",
"P. D.",
""
],
[
"Bart",
"S.",
""
],
[
"Bassalleck",
"B.",
""
],
[
"Chrien",
"R.",
""
],
[
"Diebold",
"G.",
""
],
[
"Franklin",
"G. B.",
""
],
[
"Johnston",
"K.",
""
],
[
"Pile",
"P.",
""
],
[
"Quinn",
"B.",
""
],
[
"Rozon",
"F.",
""
],
[
"Sawafta",
"R.",
""
],
[
"Schumacher",
"R. A.",
""
],
[
"Stearns",
"R.",
""
],
[
"Sukaton",
"I.",
""
],
[
"Sutter",
"R.",
""
],
[
"Szymanski",
"J. J.",
""
],
[
"Zeps",
"V. J.",
""
]
] |
0705.3312 | Jesko Sirker | J.Sirker, R. G. Pereira, J.-S. Caux, R. Hagemans, J. M. Maillet, S. R.
White, I. Affleck | Boson decay and the dynamical structure factor for the XXZ chain at
finite magnetic field | 2 pages, 2 figures, proceedings SCES '07, Houston | Physica B 403, 1520 (2008) | 10.1016/j.physb.2007.10.304 | null | cond-mat.str-el | null | We study the longitudinal dynamical structure factor $S^{zz}(q,\omega)$ for
the anisotropic spin-1/2 (XXZ) chain at finite magnetic field using
bosonization. The leading irrelevant operators in the effective bosonic model
stemming from band curvature describe boson decay processes and lead to a
high-frequency tail and a finite width $\gamma_q$ of the on-shell peak for
$S^{zz}(q,\omega)$. We use the Bethe ansatz to show that $\gamma_q\sim q^2$ for
$q\ll 1$ and to calculate the amplitudes of the leading irrelevant operators in
the effective field theory.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:10:12 GMT"
}
] | 2008-03-03T00:00:00 | [
[
"Sirker",
"J.",
""
],
[
"Pereira",
"R. G.",
""
],
[
"Caux",
"J. -S.",
""
],
[
"Hagemans",
"R.",
""
],
[
"Maillet",
"J. M.",
""
],
[
"White",
"S. R.",
""
],
[
"Affleck",
"I.",
""
]
] |
0705.3313 | Sarita Vig | S. Vig (1), L. Testi (1,2), M. Walmsley (1), S. Molinari (3), S. Carey
(4), A. Noriega-Crespo (4) ((1) Osservatorio Astrofisico di Arcetri, Firenze,
Italy, (2) ESO, Garching, Germany, (3) Istituto di Fisica dello Spazio
Interplanetario, Roma, Italy (4) Spitzer Science Center, Caltech, USA) | IRAS 18511+0146: a proto Herbig Ae/Be cluster? | Accepted by the Astronomy and Astrophysics (23 Pages, 5 Tables, 12
Figures) | null | 10.1051/0004-6361:20077583 | null | astro-ph | null | Context: The evolution of a young protocluster depends on the relative
spatial distributions and dynamics of both stars and gas. Aims: We study the
distribution and properties of the gas and stars surrounding the luminous (10^4
L_sun) protocluster IRAS 18511+0146. Methods: IRAS 18511+0146 and the cluster
associated with it has been investigated using the sub-millimetre (JCMT-SCUBA),
infrared (Spitzer-MIPSGAL, Spitzer-GLIMPSE, Palomar) and radio (VLA) continuum
data. Cluster simulations have been carried out in order to understand the
properties of clusters as well as to compare with the observations. Results:
The central most obscured part of the protocluster coincident with the compact
sub-millimetre source found with SCUBA is responsible for at least 2/3 of the
total luminosity. A number of cluster members have been identified which are
bright in mid infrared and show rising (near to mid infrared) spectral energy
distributions suggesting that these are very young stellar sources. In the mid
infrared 8.0 micron image, a number of filamentary structures and clumps are
detected in the vicinity of IRAS 18511+0146. Conclusions: Based on the
luminosity and cluster size as well as on the evolutionary stages of the
cluster members, IRAS 18511+0146 is likely to be protocluster with the most
massive object being a precursor to a Herbig type star.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:11:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Vig",
"S.",
""
],
[
"Testi",
"L.",
""
],
[
"Walmsley",
"M.",
""
],
[
"Molinari",
"S.",
""
],
[
"Carey",
"S.",
""
],
[
"Noriega-Crespo",
"A.",
""
]
] |
0705.3314 | Michael R. Pennington | M. R. Pennington | Location, correlation, radiation: where is the $\sigma$, what is its
structure and what is its coupling to photons? | 18 pages, 11 figures. To be published in Modern Physics Letters A A
number of references updated and three sentences changed in the text to
reflect these | Mod.Phys.Lett.A22:1439-1458,2007 | 10.1142/S0217732307024188 | null | hep-ph | null | Scalar mesons are a key expression of the infrared regime of QCD. The
lightest of these is the $\sigma$. Now that its pole in the complex energy
plane has been precisely located, we can ask whether this state is transiently
${\bar q}q$ or ${\bar {qq}} qq$ or a multi-meson molecule or largely glue? The
two photon decay of the $\sigma$ can, in principle, discriminate between these
possibilities. We review here how the $\gamma\gamma\to\pi^+\pi^-$, $\pi^0\pi^0$
cross-sections can be accurately computed. The result not only agrees with
experiment, but definitively fixes the radiative coupling of the $\sigma$. This
equates to a two photon width of $(4.1 \pm 0.3)$ keV, which accords with the
simple non-relativistic quark model expectation for a ${\bar u}u, {\bar d}d$
scalar. Nevertheless, robust predictions from relativistic strong coupling QCD
are required for each of the possible compositions before we can be sure which
one really delivers the determined $\gamma\gamma$ coupling.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:45:40 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 11:22:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pennington",
"M. R.",
""
]
] |
0705.3315 | Krzysztof Sacha | Bruno Eckhardt, Jakub S. Prauzner-Bechcicki, Krzysztof Sacha, and
Jakub Zakrzewski | Suppression of correlated electron escape in double ionization in strong
laser fields | 4 pages, 2 figures | Phys. Rev. A 77, 015402 (2008). | 10.1103/PhysRevA.77.015402 | null | physics.atom-ph quant-ph | null | The effect of the Pauli exclusion principle on double ionization of He atoms
by strong, linearly polarized laser pulses is analyzed. We show that correlated
electron escape, with electron momenta symmetric with respect to the field
polarization axis, is suppressed if atoms are initially prepared in the
metastable state 3S. The effect is a consequence of selection rules for the
transition to the appropriate outgoing two-electron states. We illustrate the
suppression in numerical calculations of electron and ion momentum
distributions within a reduced dimensionality model.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:22:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Eckhardt",
"Bruno",
""
],
[
"Prauzner-Bechcicki",
"Jakub S.",
""
],
[
"Sacha",
"Krzysztof",
""
],
[
"Zakrzewski",
"Jakub",
""
]
] |
0705.3316 | Stephane Le Roux | St\'ephane Le Roux (LIP) | Acyclicity of Preferences, Nash Equilibria, and Subgame Perfect
Equilibria: a Formal and Constructive Equivalence | null | null | null | null | cs.DM cs.GT cs.LO | null | In 1953, Kuhn showed that every sequential game has a Nash equilibrium by
showing that a procedure, named ``backward induction'' in game theory, yields a
Nash equilibrium. It actually yields Nash equilibria that define a proper
subclass of Nash equilibria. In 1965, Selten named this proper subclass subgame
perfect equilibria. In game theory, payoffs are rewards usually granted at the
end of a game. Although traditional game theory mainly focuses on real-valued
payoffs that are implicitly ordered by the usual total order over the reals,
works of Simon or Blackwell already involved partially ordered payoffs. This
paper generalises the notion of sequential game by replacing real-valued payoff
functions with abstract atomic objects, called outcomes, and by replacing the
usual total order over the reals with arbitrary binary relations over outcomes,
called preferences. This introduces a general abstract formalism where Nash
equilibrium, subgame perfect equilibrium, and ``backward induction'' can still
be defined. This paper proves that the following three propositions are
equivalent: 1) Preferences over the outcomes are acyclic. 2) Every sequential
game has a Nash equilibrium. 3) Every sequential game has a subgame perfect
equilibrium. The result is fully computer-certified using Coq. Beside the
additional guarantee of correctness, the activity of formalisation using Coq
also helps clearly identify the useful definitions and the main articulations
of the proof.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:30:08 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Roux",
"Stéphane Le",
"",
"LIP"
]
] |
0705.3317 | Hiroshi Noguchi | Hiroshi Noguchi and Gerhard Gompper | Transport coefficients of dissipative particle dynamics with finite time
step | 6 pages, 4 figures | Europhys. Lett. 79, 36002 (2007). | 10.1209/0295-5075/79/36002 | null | cond-mat.soft | null | The viscosity and self-diffusion constant of a mesoscale hydrodynamic method,
dissipative particle dynamics (DPD), are investigated. The viscosity of DPD
with finite time step, including the Lowe-Anderson thermostat, is derived
analytically for the ideal-gas equation of state and phenomenologically for
systems with soft repulsive potentials. The results agree well with numerical
data. The scaling of the local relative velocity in molecular dynamics
simulations is shown to be useful to obtain faster diffusion than for the DPD
thermostat.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:32:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Noguchi",
"Hiroshi",
""
],
[
"Gompper",
"Gerhard",
""
]
] |
0705.3318 | J\"org B\"unemann | Joerg Buenemann, Katalin Javorne-Radnoczi, Patrik Fazekas, Florian
Gebhard | Orbital order in degenerate Hubbard models : A variational study | final version | J. Phys.: Condens. Matter 19, 326217 (2007) | 10.1088/0953-8984/19/32/326217 | null | cond-mat.str-el | null | We use the Gutzwiller variational many-body theory to investigate the
stability of orbitally ordered states in a two-band Hubbard-model without spin
degrees of freedom. Our results differ significantly from earlier Hartree-Fock
calculations for this model. The Hartree-Fock phase diagram displays a large
variety of orbital orders. In contrast, in the Gutzwiller approach orbital
order only appears for densities in a narrow region around half filling.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:47:07 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Sep 2007 15:30:07 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Buenemann",
"Joerg",
""
],
[
"Javorne-Radnoczi",
"Katalin",
""
],
[
"Fazekas",
"Patrik",
""
],
[
"Gebhard",
"Florian",
""
]
] |
0705.3319 | Jorgen Vitting Andersen | Jorgen Vitting Andersen | Detecting anchoring in financial markets | 5 pages, 3 figures | null | null | null | q-fin.TR physics.soc-ph | null | Anchoring is a term used in psychology to describe the common human tendency
to rely too heavily (anchor) on one piece of information when making decisions.
A trading algorithm inspired by biological motors, introduced by L.
Gil\cite{Gil}, is suggested as a testing ground for anchoring in financial
markets. An exact solution of the algorithm is presented for arbitrary price
distributions. Furthermore the algorithm is extended to cover the case of a
market neutral portfolio, revealing additional evidence that anchoring is
involved in the decision making of market participants. The exposure of
arbitrage possibilities created by anchoring gives yet another illustration on
the difficulty proving market efficiency by only considering lower order
correlations in past price time series
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:50:37 GMT"
}
] | 2008-12-10T00:00:00 | [
[
"Andersen",
"Jorgen Vitting",
""
]
] |
0705.3320 | Dietmar Klemm | Dietmar Klemm and Giovanni Tagliabue | The CFT dual of AdS gravity with torsion | 17 pages, uses JHEP3.cls. References added, minor errors corrected | Class.Quant.Grav.25:035011,2008 | 10.1088/0264-9381/25/3/035011 | IFUM-894-FT | hep-th gr-qc | null | We consider the Mielke-Baekler model of three-dimensional AdS gravity with
torsion, which has gravitational and translational Chern-Simons terms in
addition to the usual Einstein-Hilbert action with cosmological constant. It is
shown that the topological nature of the model leads to a finite
Fefferman-Graham expansion. We derive the holographic stress tensor and the
associated Ward identities and show that, due to the asymmetry of the left- and
right-moving central charges, a Lorentz anomaly appears in the dual conformal
field theory. Both the consistent and the covariant Weyl and Lorentz anomaly
are determined, and the Wess-Zumino consistency conditions for the former are
verified. Moreover we consider the most general solution with flat boundary
geometry, which describes left-and right-moving gravitational waves on AdS_3
with torsion, and shew that in this case the holographic energy-momentum tensor
is given by the wave profiles. The anomalous transformation laws of the wave
profiles under diffeomorphisms preserving the asymptotic form of the bulk
solution yield the central charges of the dual CFT and confirm the results that
appeared earlier on in the literature. We finally comment on some points
concerning the microstate counting for the Riemann-Cartan black hole.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:42:21 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Jul 2007 09:50:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Klemm",
"Dietmar",
""
],
[
"Tagliabue",
"Giovanni",
""
]
] |
0705.3321 | Benedetta Ferrario | B. Ferrario | Invariant measures for a stochastic Kuramoto-Sivashinky equation | 25 pages; changed Section 6.3 | Stochastic Analysis and Applications 26 no.2 (2008), 379-407 | null | null | math.PR math.AP | null | For the 1-dimensional Kuramoto-Sivashinsky equation with random forcing term,
existence and uniqueness of solutions is proved. Then, the Markovian semigroup
is well defined; its properties are analyzed, in order to provide sufficient
conditions for existence and uniqueness of invariant measures for this
stochastic equation. Finally, regularity results are presented.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 09:55:52 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Jun 2007 08:00:46 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Ferrario",
"B.",
""
]
] |
0705.3322 | Hidenori Fukaya | JLQCD and TWQCD collaboration: H. Fukaya, S. Aoki, T.W. Chiu, S.
Hashimoto, T. Kaneko, H. Matsufuru, J. Noaki, K. Ogawa, T. Onogi and N.
Yamada | Two-flavor lattice QCD in the epsilon-regime and chiral Random Matrix
Theory | 28pages, 12figures, accepted version | Phys.Rev.D76:054503,2007 | 10.1103/PhysRevD.76.054503 | RIKEN-TH-98, UTHEP-545, KEK-CP-194, YITP-07-27, NTUTH-07-505D | hep-lat | null | The low-lying eigenvalue spectrum of the QCD Dirac operator in the
epsilon-regime is expected to match with that of chiral Random Matrix Theory
(ChRMT). We study this correspondence for the case including sea quarks by
performing two-flavor QCD simulations on the lattice. Using the overlap fermion
formulation, which preserves exact chiral symmetry at finite lattice spacings,
we push the sea quark mass down to \sim 3 MeV on a 16^3\times 32 lattice at a
lattice spacing a \simeq 0.11 fm. We compare the low-lying eigenvalue
distributions and find a good agreement with the analytical predictions of
ChRMT. By matching the lowest-lying eigenvalue we extract the chiral
condensate, \Sigma(2 GeV)[MSbar] = [251(7)(11) MeV]^3, where errors represent
statistical and higher order effects in the epsilon expansion. We also
calculate the eigenvalue distributions on the lattices with heavier sea quarks
at two lattice spacings. Although the epsilon expansion is not applied for
those sea quarks, we find a reasonable agreement of the Dirac operator spectrum
with ChRMT. The value of Sigma, after extrapolating to the chiral limit, is
consistent with the estimate in the epsilon-regime.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:07:37 GMT"
},
{
"version": "v2",
"created": "Sun, 28 Oct 2007 21:19:57 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"JLQCD",
"",
""
],
[
"collaboration",
"TWQCD",
""
],
[
":",
"",
""
],
[
"Fukaya",
"H.",
""
],
[
"Aoki",
"S.",
""
],
[
"Chiu",
"T. W.",
""
],
[
"Hashimoto",
"S.",
""
],
[
"Kaneko",
"T.",
""
],
[
"Matsufuru",
"H.",
""
],
[
"Noaki",
"J.",
""
],
[
"Ogawa",
"K.",
""
],
[
"Onogi",
"T.",
""
],
[
"Yamada",
"N.",
""
]
] |
0705.3323 | William Percival | Will J. Percival, Shaun Cole, Daniel J. Eisenstein, Robert C. Nichol,
John A. Peacock, Adrian C. Pope, Alexander S. Szalay | Measuring the Baryon Acoustic Oscillation scale using the SDSS and
2dFGRS | 14 pages, 13 figures, MNRAS accepted | Mon.Not.Roy.Astron.Soc.381:1053-1066,2007 | 10.1111/j.1365-2966.2007.12268.x | null | astro-ph | null | We introduce a method to constrain general cosmological models using Baryon
Acoustic Oscillation (BAO) distance measurements from galaxy samples covering
different redshift ranges, and apply this method to analyse samples drawn from
the SDSS and 2dFGRS. BAO are detected in the clustering of the combined 2dFGRS
and SDSS main galaxy samples, and measure the distance--redshift relation at
z=0.2. BAO in the clustering of the SDSS luminous red galaxies measure the
distance--redshift relation at z=0.35. The observed scale of the BAO calculated
from these samples and from the combined sample are jointly analysed using
estimates of the correlated errors, to constrain the form of the distance
measure D_V(z)=[(1+z)^2D_A^2cz/H(z)]^(1/3). Here D_A is the angular diameter
distance, and H(z) is the Hubble parameter. This gives
r_s/D_V(0.2)=0.1980+/-0.0058 and r_s/D_V(0.35)=0.1094+/-0.0033 (1sigma errors),
with correlation coefficient of 0.39, where r_s is the comoving sound horizon
scale at recombination. Matching the BAO to have the same measured scale at all
redshifts then gives D_V(0.35)/D_V(0.2)=1.812+/-0.060. The recovered ratio is
roughly consistent with that predicted by the higher redshift SNLS supernovae
data for Lambda cosmologies, but does require slightly stronger cosmological
acceleration at low redshift. If we force the cosmological model to be flat
with constant w, then we find Om_m=0.249+/-0.018 and w=-1.004+/-0.089 after
combining with the SNLS data, and including the WMAP measurement of the
apparent acoustic horizon angle in the CMB.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:10:21 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Oct 2007 10:47:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Percival",
"Will J.",
""
],
[
"Cole",
"Shaun",
""
],
[
"Eisenstein",
"Daniel J.",
""
],
[
"Nichol",
"Robert C.",
""
],
[
"Peacock",
"John A.",
""
],
[
"Pope",
"Adrian C.",
""
],
[
"Szalay",
"Alexander S.",
""
]
] |
0705.3324 | Amir H. Fatollahi | Amir H. Fatollahi | Coordinate/Field Affinity: A Proposal For Confinement | 8 pages, no figs., LaTeX | null | null | null | hep-th hep-lat hep-ph math-ph math.MP | null | It is argued that demanding for similar characters between the coordinates of
space-time and the fields would sound that non-Abelian gauge theories might be
formulated most naturally based on fields depending on matrix coordinates.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:11:47 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Fatollahi",
"Amir H.",
""
]
] |
0705.3325 | Ivo Labbe | I. Labbe (1), M. Franx (2), G. Rudnick (3), N. Forster Schreiber (4),
P. van Dokkum (5), A. Moorwood (6), H.-W. Rix (7), H. Rottgering (2), I.
Trujillo (7), P. van der Werf (2), ((1) Carnegie Observatories, (2) Leiden
Observatory, (3) NOAO, (4) MPE, (5) Yale, (6) ESO, (7) MPIA) | The Color Magnitude Distribution of Field Galaxies to z~3: the evolution
and modeling of the blue sequence | 29 pages, 24 figures, in emulateapj style. Abstract is abridged. Some
postscript figures are compressed. accepted for publication in ApJ (scheduled
for August 20, 2007, v665n 2 issue) | null | 10.1086/519436 | null | astro-ph | null | Using deep NIR VLT/ISAAC and optical HST/WFPC2 imaging in the fields of the
HDFS and MS1054-03, we study the rest-frame UV-to-optical colors and magnitudes
of galaxies to z~3. While there is no evidence for a red sequence at z~3, there
does appear to be a well-defined color-magnitude relation (CMR) for blue
galaxies at all redshifts, with more luminous galaxies having redder U-V
colors. The slope of the blue CMR is independent of redshift d(U-V)/dMV = -0.09
(0.01) and can be explained by a correlation of dust-reddening with luminosity.
The average color at fixed luminosity reddens strongly \Delta(U-V) = 0.75 from
z~3 to z=0, much of which can be attributed to aging of the stars. The color
scatter of the blue sequence is relatively small sigma(U-V) = 0.25 (0.03) and
constant to z~3, but notably asymmetrical with a sharp blue ridge and a wing
towards redder colors. We explore sets of star formation histories to study the
constraints placed by the shape of the scatter at z=2-3. One particular set of
models, episodic star formation, reproduces the detailed properties very well.
For a two-state model with high and low star formation, the duty cycle is
constrained to be > 40% and the contrast between the states must be a factor >
5 (or a scatter in log(SFR) of > 0.35 dex around the mean). However, episodic
models do not explain the observed tail of very red galaxies, primarily Distant
Red Galaxies (DRGs), which may have ceased star formation altogether or are
more heavily obscured. Finally, the relative number density of red, luminous MV
< -20.5 galaxies increases by a factor of ~ 6 from z = 2.7 to z = 0.5, as does
their contribution to the total rest-frame V-band luminosity density. We are
likely viewing the progressive formation of red, passively evolving galaxies.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:34:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Labbe",
"I.",
""
],
[
"Franx",
"M.",
""
],
[
"Rudnick",
"G.",
""
],
[
"Schreiber",
"N. Forster",
""
],
[
"van Dokkum",
"P.",
""
],
[
"Moorwood",
"A.",
""
],
[
"Rix",
"H. -W.",
""
],
[
"Rottgering",
"H.",
""
],
[
"Trujillo",
"I.",
""
],
[
"van der Werf",
"P.",
""
]
] |
0705.3326 | Ludger Harnau | S. Kondrat, L. Harnau, and S. Dietrich | Critical adsorption on non-spherical colloidal particles | 9 pages, 7 figures | J. Chem. Phys. 126, 174902, (2007) | 10.1063/1.2723070 | null | cond-mat.soft | null | We consider a non-spherical colloidal particle immersed in a fluid close to
its critical point. The temperature dependence of the corresponding order
parameter profile is calculated explicitly. We perform a systematic expansion
of the order parameter profile in powers of the local curvatures of the surface
of the colloidal particle. This curvature expansion reduces to the short
distance expansion of the order parameter profile in the case that the solvent
is at the critical composition.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:34:49 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 10:32:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kondrat",
"S.",
""
],
[
"Harnau",
"L.",
""
],
[
"Dietrich",
"S.",
""
]
] |
0705.3327 | Dr. Kalobaran Maiti | Kalobaran Maiti, V.R.R. Medicherla, Swapnil Patil, and Ravi Shankar
Singh | Revelation of the role of impurities and conduction electron density in
the high resolution photoemission study of ferromagnetic hexaborides | 4 figures | null | 10.1103/PhysRevLett.99.266401 | null | cond-mat.mtrl-sci | null | We investigate the temperature evolution of the electronic structure of
ferromagnetic CaB$_6$ using ultra-high resolution photoemission spectroscopy;
electronic structure of paramagnetic LaB$_6$ is used as a reference. High
resolution spectra of CaB$_6$ reveal finite density of states at the Fermi
level, $\epsilon_F$ at all the temperatures and evidence of impurity induced
localized features in the vicinity of $\epsilon_F$, which are absent in the
spectra of LaB$_6$. Analysis of the high resolution spectra suggests that
disorder in B-sublattice inducing partial localization in the mobile electrons
and low electron density at $\epsilon_F$ is important to achieve ferromagnetism
in these systems.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:36:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maiti",
"Kalobaran",
""
],
[
"Medicherla",
"V. R. R.",
""
],
[
"Patil",
"Swapnil",
""
],
[
"Singh",
"Ravi Shankar",
""
]
] |
0705.3328 | J\"orn Dunkel | David Cubero, Jes\'us Casado-Pascual, J\"orn Dunkel, Peter Talkner and
Peter H\"anggi | Thermal equilibrium and statistical thermometers in special relativity | version accepted for publication (5 pages), part of the introduction
modified, new figures, additional references | Phys. Rev. Lett. 99:170601 (2007) | 10.1103/PhysRevLett.99.170601 | null | cond-mat.stat-mech astro-ph hep-th | null | There is an intense debate in the recent literature about the correct
generalization of Maxwell's velocity distribution in special relativity. The
most frequently discussed candidate distributions include the Juettner function
as well as modifications thereof. Here, we report results from fully
relativistic one-dimensional (1D) molecular dynamics (MD) simulations that
resolve the ambiguity. The numerical evidence unequivocally favors the Juettner
distribution. Moreover, our simulations illustrate that the concept of 'thermal
equilibrium' extends naturally to special relativity only if a many-particle
system is spatially confined. They make evident that 'temperature' can be
statistically defined and measured in an observer frame independent way.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:37:57 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 14:08:31 GMT"
}
] | 2008-07-08T00:00:00 | [
[
"Cubero",
"David",
""
],
[
"Casado-Pascual",
"Jesús",
""
],
[
"Dunkel",
"Jörn",
""
],
[
"Talkner",
"Peter",
""
],
[
"Hänggi",
"Peter",
""
]
] |
0705.3329 | Ludger Harnau | S. Bolisetty, C. Airaud, Y. Xu, A. H. E. Mueller, L. Harnau, S.
Rosenfeldt, P. Lindner, and M. Ballauff | Softening of the stiffness of bottlebrush polymers by mutual interaction | 4 pages, 4 figures | Journal-ref: Phys. Rev. E 75, 040803(R), (2007) | 10.1103/PhysRevE.75.040803 | null | cond-mat.soft | null | We study bottlebrush macromolecules in a good solvent by small-angle neutron
scattering (SANS), static light scattering (SLS), and dynamic light scattering
(DLS). These polymers consist of a linear backbone to which long side chains
are chemically grafted. The backbone contains about 1600 monomer units (weight
average) and every second monomer unit carries side-chains with ca. 60 monomer
units. The SLS- and SANS data extrapolated to infinite dilution lead to the
form factor of the polymer that can be described in terms of a worm-like chain
with a contour length of 380 nm and a persistence length of 17.5 nm. An
analysis of the DLS data confirm these model parameters. The scattering
intensities taken at finite concentration can be modeled using the polymer
reference interaction site model. It reveals a softening of the bottlebrush
polymers caused by their mutual interaction. We demonstrate that the
persistence decreases from 17.5 nm down to 5 nm upon increasing the
concentration from dilute solution to the highest concentration 40.59 g/l under
consideration. The observed softening of the chains is comparable to the
theoretically predicted decrease of the electrostatic persistence length of
linear polyelectrolyte chains at finite concentrations.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:39:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bolisetty",
"S.",
""
],
[
"Airaud",
"C.",
""
],
[
"Xu",
"Y.",
""
],
[
"Mueller",
"A. H. E.",
""
],
[
"Harnau",
"L.",
""
],
[
"Rosenfeldt",
"S.",
""
],
[
"Lindner",
"P.",
""
],
[
"Ballauff",
"M.",
""
]
] |
0705.3330 | Kiwoon Choi | Kiwoon Choi | SUSY Breaking at the Tip of Throat and Mirage Mediation | 13 pages, few typos are corrected, to appear at the proceedings of
From Strings To LHC, Jan. 2007, Goa, India | PoSstringsLHC:022,2006 | null | null | hep-th hep-ph | null | We discuss some features of supersymmetry breaking induced by a
brane-localized source which is stabilized at the IR end of warped throat, and
also the resulting mirage mediation pattern of soft terms of the visible fields
which are localized in the bulk space corresponding to the UV end of throat.
Such supersymmetry breaking scheme can be naturally realized in KKLT-type
string compactification, and predicts highly distinctive pattern of low energy
superparticle masses which might be tested at the LHC.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:41:50 GMT"
},
{
"version": "v2",
"created": "Sun, 27 May 2007 23:33:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Choi",
"Kiwoon",
""
]
] |
0705.3331 | Ludger Harnau | L. Harnau, S. Rosenfeldt, and M. Ballauff | Structure factor and thermodynamics of rigid dendrimers in solution | 7 pages, 5 figures, submitted | null | 10.1063/1.2750339 | null | cond-mat.soft | null | The ''polymer reference interaction site model'' (PRISM) integral equation
theory is used to determine the structure factor of rigid dendrimers in
solution. The theory is quite successful in reproducing experimental structure
factors for various dendrimer concentrations. In addition, the structure factor
at vanishing scattering vector is calculated via the compressibility equation
using scaled particle theory and fundamental measure theory. The results as
predicted by both theories are systematically smaller than the experimental and
PRISM data for platelike dendrimers.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:43:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Harnau",
"L.",
""
],
[
"Rosenfeldt",
"S.",
""
],
[
"Ballauff",
"M.",
""
]
] |
0705.3332 | Mauro Iodice | M.Iodice, F.Cusanno, A.Acha, P.Ambrozewicz, K.A.Aniol, P.Baturin,
P.Y.Bertin, H.Benaoum, K.I.Blomqvist, W.U.Boeglin, H.Breuer, P.Brindza,
P.Bydzovsky, A.Camsonne, C.C.Chang, J.-P.Chen, Seonho Choi, E.A.Chudakov,
E.Cisbani, S.Colilli, L.Coman, B.J.Craver, G.DeCataldo, C.W.deJager, R.DeLeo,
A.P.Deur, C.Ferdi, R.J.Feuerbach, E.Folts, R.Fratoni, S.Frullani,
F.Garibaldi, O.Gayou, F.Giulani, J.Gomez, M.Gricia, J.O.Hansen, D.Hayes,
D.W.Higinbotham, T.K.Holmstrom, C.E.Hyde, H.F.Ibrahim, X.Jiang, L.J.Kaufman,
K.Kino, B.Kross, L.Lagamba, J.J.LeRose, R.A.Lindgren, M.Lucentini,
D.J.Margaziotis, P.Markowitz, S.Marrone, Z.E.Meziani, K.McCormick,
R.W.Michaels, D.J.Millener, T.Miyoshi, B.Moffit, P.A.Monaghan, M.Moteabbed,
C.MunozCamacho, S.Nanda, E.Nappi, V.V.Nelyubin, B.E.Norum, Y.Okasyasu,
K.D.Paschke, C.F.Perdrisat, E.Piasetzky, V.A.Punjabi, Y.Qiang, B.Raue,
P.E.Reimer, J.Reinhold, B.Reitz, R.E.Roche, V.M.Rodriguez, A.Saha,
F.Santavenere, A.J.Sarty, J.Segal, A.Shahinyan, J.Singh, S.Sirca, R.Snyder,
P.H.Solvignon, M.Sotona, R.Subedi, V.A.Sulkosky, T.Suzuki, H.Ueno, P.E.Ulmer,
G.M.Urciuoli, P.Veneroni, E.Voutier, B.B.Wojtsekhowski, X.Zheng, C.Zorn | High Resolution Spectroscopy of 12B_Lambda by Electroproduction | Paper submitted to Physical Review Letters | Phys.Rev.Lett.99:052501,2007 | 10.1103/PhysRevLett.99.052501 | null | nucl-ex | null | An experiment measuring electroproduction of hypernuclei has been performed
in Hall A at Jefferson Lab on a $^{12}$C target. In order to increase counting
rates and provide unambiguous kaon identification two superconducting septum
magnets and a Ring Imaging CHerenkov detector (RICH) were added to the Hall A
standard equipment. An unprecedented energy resolution of less than 700 keV
FWHM has been achieved. Thus, the observed \lam{12}{B} spectrum shows for the
first time identifiable strength in the core-excited region between the
ground-state {\it s}-wave $\Lambda$ peak and the 11 MeV {\it p}-wave $\Lambda$
peak.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:25:11 GMT"
}
] | 2009-03-19T00:00:00 | [
[
"Iodice",
"M.",
""
],
[
"Cusanno",
"F.",
""
],
[
"Acha",
"A.",
""
],
[
"Ambrozewicz",
"P.",
""
],
[
"Aniol",
"K. A.",
""
],
[
"Baturin",
"P.",
""
],
[
"Bertin",
"P. Y.",
""
],
[
"Benaoum",
"H.",
""
],
[
"Blomqvist",
"K. I.",
""
],
[
"Boeglin",
"W. U.",
""
],
[
"Breuer",
"H.",
""
],
[
"Brindza",
"P.",
""
],
[
"Bydzovsky",
"P.",
""
],
[
"Camsonne",
"A.",
""
],
[
"Chang",
"C. C.",
""
],
[
"Chen",
"J. -P.",
""
],
[
"Choi",
"Seonho",
""
],
[
"Chudakov",
"E. A.",
""
],
[
"Cisbani",
"E.",
""
],
[
"Colilli",
"S.",
""
],
[
"Coman",
"L.",
""
],
[
"Craver",
"B. J.",
""
],
[
"DeCataldo",
"G.",
""
],
[
"deJager",
"C. W.",
""
],
[
"DeLeo",
"R.",
""
],
[
"Deur",
"A. P.",
""
],
[
"Ferdi",
"C.",
""
],
[
"Feuerbach",
"R. J.",
""
],
[
"Folts",
"E.",
""
],
[
"Fratoni",
"R.",
""
],
[
"Frullani",
"S.",
""
],
[
"Garibaldi",
"F.",
""
],
[
"Gayou",
"O.",
""
],
[
"Giulani",
"F.",
""
],
[
"Gomez",
"J.",
""
],
[
"Gricia",
"M.",
""
],
[
"Hansen",
"J. O.",
""
],
[
"Hayes",
"D.",
""
],
[
"Higinbotham",
"D. W.",
""
],
[
"Holmstrom",
"T. K.",
""
],
[
"Hyde",
"C. E.",
""
],
[
"Ibrahim",
"H. F.",
""
],
[
"Jiang",
"X.",
""
],
[
"Kaufman",
"L. J.",
""
],
[
"Kino",
"K.",
""
],
[
"Kross",
"B.",
""
],
[
"Lagamba",
"L.",
""
],
[
"LeRose",
"J. J.",
""
],
[
"Lindgren",
"R. A.",
""
],
[
"Lucentini",
"M.",
""
],
[
"Margaziotis",
"D. J.",
""
],
[
"Markowitz",
"P.",
""
],
[
"Marrone",
"S.",
""
],
[
"Meziani",
"Z. E.",
""
],
[
"McCormick",
"K.",
""
],
[
"Michaels",
"R. W.",
""
],
[
"Millener",
"D. J.",
""
],
[
"Miyoshi",
"T.",
""
],
[
"Moffit",
"B.",
""
],
[
"Monaghan",
"P. A.",
""
],
[
"Moteabbed",
"M.",
""
],
[
"MunozCamacho",
"C.",
""
],
[
"Nanda",
"S.",
""
],
[
"Nappi",
"E.",
""
],
[
"Nelyubin",
"V. V.",
""
],
[
"Norum",
"B. E.",
""
],
[
"Okasyasu",
"Y.",
""
],
[
"Paschke",
"K. D.",
""
],
[
"Perdrisat",
"C. F.",
""
],
[
"Piasetzky",
"E.",
""
],
[
"Punjabi",
"V. A.",
""
],
[
"Qiang",
"Y.",
""
],
[
"Raue",
"B.",
""
],
[
"Reimer",
"P. E.",
""
],
[
"Reinhold",
"J.",
""
],
[
"Reitz",
"B.",
""
],
[
"Roche",
"R. E.",
""
],
[
"Rodriguez",
"V. M.",
""
],
[
"Saha",
"A.",
""
],
[
"Santavenere",
"F.",
""
],
[
"Sarty",
"A. J.",
""
],
[
"Segal",
"J.",
""
],
[
"Shahinyan",
"A.",
""
],
[
"Singh",
"J.",
""
],
[
"Sirca",
"S.",
""
],
[
"Snyder",
"R.",
""
],
[
"Solvignon",
"P. H.",
""
],
[
"Sotona",
"M.",
""
],
[
"Subedi",
"R.",
""
],
[
"Sulkosky",
"V. A.",
""
],
[
"Suzuki",
"T.",
""
],
[
"Ueno",
"H.",
""
],
[
"Ulmer",
"P. E.",
""
],
[
"Urciuoli",
"G. M.",
""
],
[
"Veneroni",
"P.",
""
],
[
"Voutier",
"E.",
""
],
[
"Wojtsekhowski",
"B. B.",
""
],
[
"Zheng",
"X.",
""
],
[
"Zorn",
"C.",
""
]
] |
0705.3333 | Peter Nyman | Peter Nyman | Simulation of Quantum Algorithms with a Symbolic Programming Language | null | null | null | null | quant-ph | null | This study examines the simulation of quantum algorithms on a classical
computer. The program code implemented on a classical computer will be a
straight connection between the mathematical formulation of quantum mechanics
and computational methods. The computational language will include formulations
such as quantum state, superposition and quantum operator.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 10:54:52 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 14:01:36 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Nyman",
"Peter",
""
]
] |
0705.3334 | Konstantinos Dimopoulos | Konstantinos Dimopoulos | Supergravity inspired Vector Curvaton | 16 pages, 1 figure, RevTeX | Phys.Rev.D76:063506,2007 | 10.1103/PhysRevD.76.063506 | null | hep-ph astro-ph hep-th | null | It is investigated whether a massive Abelian vector field, whose gauge
kinetic function is growing during inflation, can be responsible for the
generation of the curvature perturbation in the Universe. Particle production
is studied and it is shown that the vector field can obtain a scale invariant
superhorizon spectrum of perturbations with a reasonable choice of kinetic
function. After inflation the vector field begins coherent oscillations, during
which it corresponds to pressureless isotropic matter. When the vector field
dominates the Universe its perturbations give rise to the observed curvature
perturbation following the curvaton scenario. It is found that this is possible
if, after the end of inflation, the mass of the vector field increases at a
phase transition at temperature of order 1 TeV or lower. Inhomogeneous
reheating, whereby the vector field modulates the decay rate of the inflaton,
is also studied.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:00:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dimopoulos",
"Konstantinos",
""
]
] |
0705.3335 | Ricardo Carrera R. | Ricardo Carrera (1), Carme Gallart (1), Elena Pancino (2), Robert Zinn
(3) ((1)Instituto de Astrofisica de Canarias, Spain, (2) Osservatorio
Astronomico di Bologna, Italy, (3) Deparment of Astronomy, Yale University,
USA) | The Infrared Ca II triplet as metallicity indicator | 52 pages, 16 figures, accepted for publication in Astronomical
Journal | Astron.J.134:1298-1314,2007 | 10.1086/520803 | null | astro-ph | null | From observations of almost 500 RGB stars in 29 Galactic open and globular
clusters, we have investigated the behaviour of the infrared Ca II triplet
(8498, 8542 and 8662 \AA) in the age range 13$\leq$Age/Gyr$\leq$0.25 and the
metallicity range $-2.2\leq$ [Fe/H] $\leq$+0.47. These are the widest ranges of
ages and metallicities in which the behaviour of the Ca II triplet lines has
been investigated in a homogeneous way. We report the first empirical study of
the variation of the CaII triplet lines strength, for given metallicities, with
respect to luminosity. We find that the sequence defined by each cluster in the
Luminosity-$\Sigma$Ca plane is not exactly linear. However, when only stars in
a small magnitude interval are observed, the sequences can be considered as
linear. We have studied the the Ca II triplet lines on three metallicities
scales. While a linear correlation between the reduced equivalent width ($W'_V$
or $W'_I$) versus metallicity is found in the \citet{cg97} and \citet{ki03}
scales, a second order term needs to be added when the \citet{zw84} scale is
adopted. We investigate the role of age from the wide range of ages covered by
our sample. We find that age has a weak influence on the final relationship.
Finally, the relationship derived here is used to estimate the metallicities of
three poorly studied open clusters: Berkeley 39, Trumpler 5 and Collinder 110.
For the latter, the metallicity derived here is the first spectroscopic
estimate available.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:01:46 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Carrera",
"Ricardo",
""
],
[
"Gallart",
"Carme",
""
],
[
"Pancino",
"Elena",
""
],
[
"Zinn",
"Robert",
""
]
] |
0705.3336 | Katy Lancaster | Katy Lancaster, Mark Birkinshaw, Marcin P. Gawronski, Ian Browne,
Roman Feiler, Andrzej Kus, Stuart Lowe, Eugeniusz Pazderski and Peter
Wilkinson | Preliminary Sunyaev Zel'dovich Observations of Galaxy Clusters with
OCRA-p | 9 pages, 2 figures. Accepted by MNRAS, online early | Mon.Not.Roy.Astron.Soc.378:673-680,2007 | 10.1111/j.1365-2966.2007.11808.x | null | astro-ph | null | We present 30 GHz Sunyaev Zel'dovich (SZ) observations of a sample of four
galaxy clusters with a prototype of the One Centimetre Receiver Array (OCRA-p)
which is mounted on the Torun 32-m telescope. The clusters (Cl0016+16,
MS0451.6-0305, MS1054.4-0321 and Abell 2218) are popular SZ targets and serve
as commissioning observations. All four are detected with clear significance
(4-6 sigma) and values for the central temperature decrements are in good
agreement with measurements reported in the literature. We believe that
systematic effects are successfully suppressed by our observing strategy. The
relatively short integration times required to obtain these results demonstrate
the power of OCRA-p and its successors for future SZ studies.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:02:23 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Lancaster",
"Katy",
""
],
[
"Birkinshaw",
"Mark",
""
],
[
"Gawronski",
"Marcin P.",
""
],
[
"Browne",
"Ian",
""
],
[
"Feiler",
"Roman",
""
],
[
"Kus",
"Andrzej",
""
],
[
"Lowe",
"Stuart",
""
],
[
"Pazderski",
"Eugeniusz",
""
],
[
"Wilkinson",
"Peter",
""
]
] |
0705.3337 | Makoto Ozawa | Makoto Ozawa | Ascending number of knots and links | 11 pages, 30 figures | null | null | null | math.GT | null | We introduce a new numerical invariant of knots and links from the descending
diagrams. It is considered to live between the unknotting number and the bridge
number.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:04:57 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Ozawa",
"Makoto",
""
]
] |
0705.3338 | Dominik Riechers | Dominik A. Riechers (1), Fabian Walter (1), Pierre Cox (2),
Christopher L. Carilli (3), Axel Weiss (4), Frank Bertoldi (5), Roberto Neri
(2) ((1)-MPIA Heidelberg, Germany; (2)-IRAM Grenoble, France; (3)-NRAO
Socorro, USA; (4)-MPIfR Bonn, Germany; (5)-AIfA Bonn, Germany) | Detection of Emission from the CN Radical in the Cloverleaf Quasar at
z=2.56 | 6 pages, 5 figures, 1 table, to appear in ApJ (accepted May 23, 2007) | Astrophys.J.666:778-783,2007 | 10.1086/520335 | null | astro-ph | null | We report the detection of CN(N=3-2) emission towards the Cloverleaf quasar
(z=2.56) based on observations with the IRAM Plateau de Bure Interferometer.
This is the first clear detection of emission from this radical at high
redshift. CN emission is a tracer of dense molecular hydrogen gas (n(H2) > 10^4
cm^{-3}) within star-forming molecular clouds, in particular in regions where
the clouds are affected by UV radiation. The HCN/CN intensity ratio can be used
as a diagnostic for the relative importance of photodissociation regions (PDRs)
in a source, and as a sensitive probe of optical depth, the radiation field,
and photochemical processes. We derive a lensing-corrected CN(N=3-2) line
luminosity of L'(CN(3-2) = (4.5 +/- 0.5) x 10^9 K km/s pc^2. The ratio between
CN luminosity and far-infrared luminosity falls within the scatter of the same
relationship found for low-z (ultra-) luminous infrared galaxies. Combining our
new results with CO(J=3-2) and HCN(J=1-0) measurements from the literature and
assuming thermal excitation for all transitions, we find a CO/CN luminosity
ratio of 9.3 +/- 1.9 and a HCN/CN luminosity ratio of 0.95 +/- 0.15. However,
we find that the CN(N=3-2) line is likely only subthermally excited, implying
that those ratios may only provide upper limits for the intrinsic 1-0 line
luminosity ratios. We conclude that, in combination with other molecular gas
tracers like CO, HCN, and HCO+, CN is an important probe of the physical
conditions and chemical composition of dense molecular environments at high
redshift.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:18:26 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Riechers",
"Dominik A.",
""
],
[
"Walter",
"Fabian",
""
],
[
"Cox",
"Pierre",
""
],
[
"Carilli",
"Christopher L.",
""
],
[
"Weiss",
"Axel",
""
],
[
"Bertoldi",
"Frank",
""
],
[
"Neri",
"Roberto",
""
]
] |
0705.3339 | Alessandro Ferretti | A. Ferretti (1), R. Arnaldi (1), R. Averbeck (8), K. Banicz (4), J.
Castor (3), B. Chaurand (6), C. Cical\`o (9), A. Colla (1,2), P. Cortese (1),
S. Damjanovic (4,2), A. David (2), A. De Falco (9), A. Devaux (3), A. Drees
(8), L. Ducroux (10), H. En'yo (7), M. Floris (9), A. F\"orster (2), P. Force
(3), N. Guettet (2), A. Guichard (10), H. Gulkanyan (11), J.M. Heuser (7), M.
Keil (2), L. Kluberg (6), C. Louren\c{c}o (2), J. Lozano (5), F. Manso (3),
P. Martins (5), A. Masoni (9), A. Neves (5), H. Ohnishi (7), C. Oppedisano
(1), P. Parracho (5), P. Pillot (10), G. Puddu (9), E. Radermacher (2), P.
Ramalhete (5), P. Rosinsky (2), E. Scomparin (1), J. Seixas (5), S. Serci
(9), R. Shahoyan (5), P. Sonderegger (5), H.J. Specht (4), R. Tieulent (10),
G. Usai (9), R. Veenhof (2) and H. W\"ohri (9) ((1)Univ. di Torino and INFN,
Torino, Italy. (2)CERN, Geneva, Switzerland. (3)LPC, Univ. Blaise Pascal and
CNRS-IN2P3, Clermont-Ferrand, France. (4)Univ. Heidelberg, Heidelberg,
Germany. (5)IST-CFTP, Lisbon, Portugal. (6)LLR, Ecole Polytechnique and
CNRS-IN2P3, Palaiseau, France. (7)RIKEN, Wako, Saitama, Japan. (8)SUNY, Stony
Brook, NY, USA. (9)Univ. di Cagliari and INFN, Cagliari, Italy. (10)IPN-Lyon,
Univ. Claude Bernard Lyon-I and CNRS-IN2P3, Lyon, France. (11)YerPhI,
Yerevan, Armenia.) | Highlights from the NA60 experiment | 4 pages, 6 figures, proceeding for the Rencontres de Moriond - QCD
and Hadronic interactions - La Thuile (Italy), March 17-24 2007 | null | null | null | nucl-ex | null | The NA60 experiment is a fixed-target experiment at the CERN SPS. It has
measured the dimuon yield in Indium--Indium collisions with an In beam of 158
AGeV/c and in p-A collisions with a proton beam of 400 and 158 AGeV/c. The
results allow to address three important physics topics, namely the study of
the rho spectral function in nuclear collisions, the clarification of the
origin of the dimuon excess measured by NA50 in the intermediate mass range,
and the J/psi suppression pattern in a collision system different from Pb-Pb.
An overview of these results will be given in this paper.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:16:14 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Ferretti",
"A.",
""
],
[
"Arnaldi",
"R.",
""
],
[
"Averbeck",
"R.",
""
],
[
"Banicz",
"K.",
""
],
[
"Castor",
"J.",
""
],
[
"Chaurand",
"B.",
""
],
[
"Cicalò",
"C.",
""
],
[
"Colla",
"A.",
""
],
[
"Cortese",
"P.",
""
],
[
"Damjanovic",
"S.",
""
],
[
"David",
"A.",
""
],
[
"De Falco",
"A.",
""
],
[
"Devaux",
"A.",
""
],
[
"Drees",
"A.",
""
],
[
"Ducroux",
"L.",
""
],
[
"En'yo",
"H.",
""
],
[
"Floris",
"M.",
""
],
[
"Förster",
"A.",
""
],
[
"Force",
"P.",
""
],
[
"Guettet",
"N.",
""
],
[
"Guichard",
"A.",
""
],
[
"Gulkanyan",
"H.",
""
],
[
"Heuser",
"J. M.",
""
],
[
"Keil",
"M.",
""
],
[
"Kluberg",
"L.",
""
],
[
"Lourenço",
"C.",
""
],
[
"Lozano",
"J.",
""
],
[
"Manso",
"F.",
""
],
[
"Martins",
"P.",
""
],
[
"Masoni",
"A.",
""
],
[
"Neves",
"A.",
""
],
[
"Ohnishi",
"H.",
""
],
[
"Oppedisano",
"C.",
""
],
[
"Parracho",
"P.",
""
],
[
"Pillot",
"P.",
""
],
[
"Puddu",
"G.",
""
],
[
"Radermacher",
"E.",
""
],
[
"Ramalhete",
"P.",
""
],
[
"Rosinsky",
"P.",
""
],
[
"Scomparin",
"E.",
""
],
[
"Seixas",
"J.",
""
],
[
"Serci",
"S.",
""
],
[
"Shahoyan",
"R.",
""
],
[
"Sonderegger",
"P.",
""
],
[
"Specht",
"H. J.",
""
],
[
"Tieulent",
"R.",
""
],
[
"Usai",
"G.",
""
],
[
"Veenhof",
"R.",
""
],
[
"Wöhri",
"H.",
""
]
] |
0705.3340 | Stefan Hollands | Stefan Hollands | Renormalized Quantum Yang-Mills Fields in Curved Spacetime | Latex 144pp, no figures, review style presentation; v2: equations
corrected, details in proof of Ward-identity added, discussion of state
space, refs. added; v3: typos corrected, details added in renormalization
section, one subsection removed; v4 BRST-invariant state, typos corrected,
background field discussion clarified, hyperref feature added | Rev.Math.Phys.20:1033-1172,2008 | 10.1142/S0129055X08003420 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a proof that quantum Yang-Mills theory can be consistently defined
as a renormalized, perturbative quantum field theory on an arbitrary globally
hyperbolic curved, Lorentzian spacetime. To this end, we construct the
non-commutative algebra of observables, in the sense of formal power series, as
well as a space of corresponding quantum states. The algebra contains all gauge
invariant, renormalized, interacting quantum field operators (polynomials in
the field strength and its derivatives), and all their relations such as
commutation relations or operator product expansion. It can be viewed as a
deformation quantization of the Poisson algebra of classical Yang-Mills theory
equipped with the Peierls bracket. The algebra is constructed as the cohomology
of an auxiliary algebra describing a gauge fixed theory with ghosts and
anti-fields. A key technical difficulty is to establish a suitable hierarchy of
Ward identities at the renormalized level that ensure conservation of the
interacting BRST-current, and that the interacting BRST-charge is nilpotent.
The algebra of physical interacting field observables is obtained as the
cohomology of this charge. As a consequence of our constructions, we can prove
that the operator product expansion closes on the space of gauge invariant
operators. Similarly, the renormalization group flow is proved not to leave the
space of gauge invariant operators.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:33:38 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 13:03:52 GMT"
},
{
"version": "v3",
"created": "Thu, 28 Feb 2008 16:27:04 GMT"
},
{
"version": "v4",
"created": "Wed, 14 Mar 2018 07:47:21 GMT"
}
] | 2018-03-15T00:00:00 | [
[
"Hollands",
"Stefan",
""
]
] |
0705.3341 | Rajiv Bhat | Rajiv Bhat, M. Kraemer, J. Cooper, M. J. Holland | Hall effects in Bose-Einstein condensates in a rotating optical lattice | 11 pages, 13 figures | null | 10.1103/PhysRevA.76.043601 | null | cond-mat.mes-hall cond-mat.other | null | Using the Kubo formalism, we demonstrate fractional quantum Hall features in
a rotating Bose-Einstein condensate in a co-rotating two-dimensional optical
lattice. The co-rotating lattice and trap potential allow for an effective
magnetic field and compensation of the centrifugal potential. Fractional
quantum Hall features are seen for the single-particle system and for few
strongly interacting many-particle systems.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 19:22:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bhat",
"Rajiv",
""
],
[
"Kraemer",
"M.",
""
],
[
"Cooper",
"J.",
""
],
[
"Holland",
"M. J.",
""
]
] |
0705.3342 | Nadine Guillotin-Plantard | Nadine Guillotin-Plantard (ICJ), Arnaud Le Ny (LM-Orsay) | A functional limit theorem for a 2D-random walk with dependent marginals | null | null | null | null | math.PR | null | We prove a non-standard functional limit theorem for a two dimensional simple
random walk on some randomly oriented lattices. This random walk, already known
to be transient, has different horizontal and vertical fluctuations leading to
different normalizations in the functional limit theorem, with a non-Gaussian
horizontal behavior. We also prove that the horizontal and vertical components
are not asymptotically independent.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:27:56 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Guillotin-Plantard",
"Nadine",
"",
"ICJ"
],
[
"Ny",
"Arnaud Le",
"",
"LM-Orsay"
]
] |
0705.3343 | David Coeurjolly | David Coeurjolly (LIRIS), Annick Montanvert (GIPSA-lab) | Optimal Separable Algorithms to Compute the Reverse Euclidean Distance
Transformation and Discrete Medial Axis in Arbitrary Dimension | null | IEEE Transactions on Pattern Analysis and Machine Intelligence 29,
3 (01/03/2007) 437-448 | 10.1109/TPAMI.2007.54 | null | cs.CG | null | In binary images, the distance transformation (DT) and the geometrical
skeleton extraction are classic tools for shape analysis. In this paper, we
present time optimal algorithms to solve the reverse Euclidean distance
transformation and the reversible medial axis extraction problems for
$d$-dimensional images. We also present a $d$-dimensional medial axis filtering
process that allows us to control the quality of the reconstructed shape.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:29:52 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Coeurjolly",
"David",
"",
"LIRIS"
],
[
"Montanvert",
"Annick",
"",
"GIPSA-lab"
]
] |
0705.3344 | Marco Lops | Ezio Biglieri, Marco Lops | Multiuser detection in a dynamic environment Part I: User identification
and data detection | To be published on IEEE Transactions on Information Theory | null | 10.1109/TIT.2007.903115 | null | cs.IT math.IT | null | In random-access communication systems, the number of active users varies
with time, and has considerable bearing on receiver's performance. Thus,
techniques aimed at identifying not only the information transmitted, but also
that number, play a central role in those systems. An example of application of
these techniques can be found in multiuser detection (MUD). In typical MUD
analyses, receivers are based on the assumption that the number of active users
is constant and known at the receiver, and coincides with the maximum number of
users entitled to access the system. This assumption is often overly
pessimistic, since many users might be inactive at any given time, and
detection under the assumption of a number of users larger than the real one
may impair performance.
The main goal of this paper is to introduce a general approach to the problem
of identifying active users and estimating their parameters and data in a
random-access system where users are continuously entering and leaving the
system. The tool whose use we advocate is Random-Set Theory: applying this, we
derive optimum receivers in an environment where the set of transmitters
comprises an unknown number of elements. In addition, we can derive
Bayesian-filter equations which describe the evolution with time of the a
posteriori probability density of the unknown user parameters, and use this
density to derive optimum detectors. In this paper we restrict ourselves to
interferer identification and data detection, while in a companion paper we
shall examine the more complex problem of estimating users' parameters.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:31:41 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Biglieri",
"Ezio",
""
],
[
"Lops",
"Marco",
""
]
] |
0705.3345 | Pawel Majewski Dr | N. J. Spooner | Direct Dark Matter Searches | Submitted to JPSJ, 20 pages, 5 figures | J.Phys.Soc.Jap.76:111016,2007 | 10.1143/JPSJ.76.111016 | null | astro-ph | null | For many working in particle physics and cosmology successful discovery and
characterisation of the new particles that most likely explain the non-baryonic
cold dark matter, known to comprise the majority of matter in the Universe,
would be the most significant advance in physics for a century. Reviewed here
is the current status of direct searches for such particles, in particular the
so-called Weakly Interacting Massive Particles (WIMPs), together with a brief
overview of the possible future direction of the field extrapolated from recent
advances. Current best limits are at or below 10-7 pb for spin-independent
neutralino coupling, sufficient that experiments are already probing SUSY
models. However, new detectors with tonne-scale mass and/or capability to
correlate signal events to our motion through the Galaxy will likely be needed
to determine finally whether WIMPs exist.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:34:16 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Spooner",
"N. J.",
""
]
] |
0705.3346 | Alexandra Anishchanka | A. Anishchanka, A.F. Volkov, K.B. Efetov | Collective Modes in Two-band Superconductors | 13 pages, 5 figures; replotted figures and added references,
submitted to Phys. Rev. B | Review B 76, 104504 (2007) | null | null | cond-mat.supr-con | null | We analyze collective modes in two-band superconductors in the dirty limit.
It is shown that these modes exist at all temperatures $T$ below $T_{c}$
provided the frequency of the modes is higher than the inelastic scattering
rate and lower than the energy gaps $\Delta_{a,b}$. At low temperatures these
modes are related to counterphase oscillations of the condensate currents in
each band. The spectrum of the collective oscillations is similar to the
spectrum of the Josephson ''plasma'' modes in a tunnel Josephson junction but
the velocity of the mode propagation in the case under consideration is much
lower. At higher temperatures ($\Delta_{b}<T<T_{c}$) the spectrum consists of
two branches. One of them is gapless (sound-like) and the second one has a
threshhold that depends on coupling between the bands. We formulate the
conditions under which both types of collective modes can exist. The spectrum
of the collective modes can be determined by measuring the I-V characteristics
of a Josephson junction in a way as it was done by Carlson and Goldman.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:36:44 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jul 2007 14:11:49 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Anishchanka",
"A.",
""
],
[
"Volkov",
"A. F.",
""
],
[
"Efetov",
"K. B.",
""
]
] |
0705.3347 | Steffen Froehlich | Steffen Froehlich, Frank Mueller | On critical normal sections for two-dimensional immersions in R^n and a
Riemann-Hilbert problem | null | null | null | null | math.DG math.AP | null | For orthonormal normal sections of two-dimensional immersions in R^4 we
define torsion coefficients and a functional for the total torsion. We discuss
normal sections which are critical for this functional. In particular, a global
estimate for the torsion coefficients of a critical normal section in terms of
the curvature of the normal bundle is provided.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:40:54 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Froehlich",
"Steffen",
""
],
[
"Mueller",
"Frank",
""
]
] |
0705.3348 | Sebastian Bustingorry | Sebastian Bustingorry, Leticia F. Cugliandolo, Jos\'e Luis Iguain | Out-of-equilibrium relaxation of the Edwards-Wilkinson elastic line | 33 pages, 16 figs | J. Stat. Mech. (2007) P09008 | 10.1088/1742-5468/2007/09/P09008 | null | cond-mat.stat-mech | null | We study the non-equilibrium relaxation of an elastic line described by the
Edwards-Wilkinson equation. Although this model is the simplest representation
of interface dynamics, we highlight that many (not though all) important
aspects of the non-equilibrium relaxation of elastic manifolds are already
present in such quadratic and clean systems. We analyze in detail the aging
behaviour of several two-times averaged and fluctuating observables taking into
account finite-size effects and the crossover to the stationary and equilibrium
regimes. We start by investigating the structure factor and extracting from its
decay a growing correlation length. We present the full two-times and size
dependence of the interface roughness and we generalize the Family-Vicsek
scaling form to non-equilibrium situations. We compute the incoherent cattering
function and we compare it to the one measured in other glassy systems. We
analyse the response functions, the violation of the fluctuation-dissipation
theorem in the aging regime, and its crossover to the equilibrium relation in
the stationary regime. Finally, we study the out-of-equilibrium fluctuations of
the previously studied two-times functions and we characterize the scaling
properties of their probability distribution functions. Our results allow us to
obtain new insights into other glassy problems such as the aging behavior in
colloidal glasses and vortex glasses.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:45:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bustingorry",
"Sebastian",
""
],
[
"Cugliandolo",
"Leticia F.",
""
],
[
"Iguain",
"José Luis",
""
]
] |
0705.3349 | Konrad Sch\"obel | Konrad Sch\"obel | Moduli Spaces of PU(2)-Instantons on Minimal Class VII Surfaces with
b_2=1 | 23 pages, 4 figures | Annales de l'Institut Fourier, 58 (2008), no. 5, 1691-1722 | 10.5802/aif.2395 | null | math.DG math.AG math.CV | null | We describe explicitly the moduli spaces $M^{pst}_g(S,E)$ of polystable
holomorphic structures $E$ with $\det E\cong K$ on a rank 2 vector bundle $E$
with $c_1(E)=c_1(K)$ and $c_2(E)=0$ for all minimal class VII surfaces $S$ with
$b_2(S)=1$ and with respect to all possible Gauduchon metrics $g$. These
surfaces $S$ are non-elliptic and non-Kaehler complex surfaces and have
recently been completely classified. When $S$ is a half or parabolic Inoue
surface, $M^{pst}_g(S,E)$ is always a compact one-dimensional complex disc.
When $S$ is an Enoki surface, one obtains a complex disc with finitely many
transverse self-intersections whose number becomes arbitrarily large when $g$
varies in the space of Gauduchon metrics. $M^{pst}_g(S,E)$ can be identified
with a moduli space of PU(2)-instantons. The moduli spaces of simple bundles of
the above type leads to interesting examples of non-Hausdorff singular
one-dimensional complex spaces.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:48:03 GMT"
}
] | 2013-11-14T00:00:00 | [
[
"Schöbel",
"Konrad",
""
]
] |
0705.3350 | Jorge Casares | J. Casares, P. Bonifacio, J. I. Gonzalez Hernandez, P. Molaro, M.
Zoccali | The isotopic 6Li/7Li ratio in Cen X-4 and the origin of Li in X-ray
binaries | 9 pages, 8 figures, 5 tables, accepted for publication in A&A | null | 10.1051/0004-6361:20066875 | null | astro-ph | null | Context: Cool stars, companions to compact objects, are known to show Li
abundances which are high compared to field stars of the same spectral type,
which are heavily Li depleted. This may be due either to Li production or Li
preservation in these systems. Aims: To measure the lithium isotopic ratio in
the companion star of the neutron star X-ray binary Cen X-4. Method: We use
UVES spectra obtained in years 2000 and 2004 around the orbital quadratures.
The spectra are analysed with spectrum synthesis techniques and the errors
estimated with Monte Carlo simulations. Results: We measure A(Li)=2.87+-0.20
and 6Li/7Li = 0.12+0.08-0.05 at 68% confidence level. We also present updated
system parameters with a refined determination of the orbital period and
component masses i.e. 1.14+-0.45 Msun and 0.23+-0.10 Msun for the neutron star
and companion, respectively. Conclusions: In our view the low level of 6Li
favours Li preservation scenarios, although Li production mechanisms cannot be
ruled out. In the case of preservation, no Li is freshly created in the binary,
but the tidally-locked companion has preserved its original Li by some
mechanism, possibly inhibited destruction due to its fast rotation.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:54:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Casares",
"J.",
""
],
[
"Bonifacio",
"P.",
""
],
[
"Hernandez",
"J. I. Gonzalez",
""
],
[
"Molaro",
"P.",
""
],
[
"Zoccali",
"M.",
""
]
] |
0705.3351 | Rubin Pavel | N. Kristoffel, P. Rubin | Behaviour of superconductivity energetic characteristics in
electron-doped cuprates. A simple model | 10 pages, 3 figures | null | 10.1016/j.physleta.2007.08.035 | null | cond-mat.supr-con | null | A simple model to describe the energetic phase diagram of electron-doped
cuprate superconductor is developed. Interband pairing operates between the UHB
and the defect states created by doping and supplied by both extincting HB-s.
Two defect subbands correspond to the ($\pi, 0$) and ($\pi /2,\pi /2$) momentum
regions. Extended doping quenches the bare normal state gaps (pseudogaps).
Maximal transition temperature corresponds to overlapping bands ensemble
intersected by the chemical potential. Illustrative results for $T_c$, pseudo-
and superconducting gaps are calculated on the whole doping scale. Major
characteristics features on the phase diagram are reproduced. Anticipated
manifestation of gaps doping dynamics is discussed.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 11:56:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kristoffel",
"N.",
""
],
[
"Rubin",
"P.",
""
]
] |
0705.3352 | Pekka Ikonen | Pekka Ikonen, Elena Saenz, Ramon Gonzalo, Constantin Simovski, and
Sergei Tretyakov | Mesoscopic effective material parameters for thin layers modeled as
single and double grids of interacting loaded wires | 36 pages, 23 figures | Metamaterials, vol. 1, no. 2, pp. 89-105, 2007. | 10.1016/j.metmat.2007.09.003 | null | physics.class-ph | null | As an example of thin composite layers we consider single and double grids of
periodically arranged interacting wires loaded with a certain distributed
reactive impedance. Currents induced to the wires by a normally incident plane
wave are rigorously calculated and the corresponding dipole moment densities
are determined. Using this data and the averaged fields we assign mesoscopic
material parameters for the proposed grid structures. These parameters depend
on the number of grids, and measure the averaged induced polarizations. It is
demonstrated that properly loaded double grids possess polarization response
that over some frequency range can be described by assigning negative values
for the mesoscopic parameters. Discussion is conducted on the physical
meaningfulness to assign such material parameters for thin composite slabs. The
results predicted by the proposed method for the double-grid structures are
compared with the results obtained using the commonly adopted S-parameter
retrieval procedure.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:01:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ikonen",
"Pekka",
""
],
[
"Saenz",
"Elena",
""
],
[
"Gonzalo",
"Ramon",
""
],
[
"Simovski",
"Constantin",
""
],
[
"Tretyakov",
"Sergei",
""
]
] |
0705.3353 | Jerome Wenger | Jerome Wenger, Benoit Cluzel, Jose Dintinger, Nicolas Bonod,
Anne-Laure Fehrembach, Evgeny Popov, Pierre-Francois Lenne, Thomas W.
Ebbesen, and Herve Rigneault | Radiative and non-radiative photokinetics alteration inside a single
metallic nanometric aperture | Accepted for publication in J. Phys. Chem. C | null | null | null | quant-ph | null | We resolve the photokinetic rates enhancement of Rhodamine 6G molecules
diffusing in a water-glycerol mixture within a single nanometric aperture
milled in an opaque aluminium film. Combining fluorescence correlation
spectroscopy and lifetime measurements, we report the relative influence of
excitation, radiative and non-radiative decay in the fluorescence process,
giving a detailed description of the physics behind the overall 15 fold
enhancement of the average fluorescence rate per molecule. This procedure is
broadly adaptable to a wide range of nanostructures.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:11:21 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Wenger",
"Jerome",
""
],
[
"Cluzel",
"Benoit",
""
],
[
"Dintinger",
"Jose",
""
],
[
"Bonod",
"Nicolas",
""
],
[
"Fehrembach",
"Anne-Laure",
""
],
[
"Popov",
"Evgeny",
""
],
[
"Lenne",
"Pierre-Francois",
""
],
[
"Ebbesen",
"Thomas W.",
""
],
[
"Rigneault",
"Herve",
""
]
] |
0705.3354 | Pierre-Eymeric Janolin | Pierre-Eymeric Janolin, Bernard Fraisse, Francoise Le Marrec and
Brahim Dkhil | Partial decoupling between strain and polarization in mono-oriented
Pb(Zr0.2Ti0.8)O3 thin film | 11 pages, 3 figures | null | 10.1063/1.2742313 | null | cond-mat.mtrl-sci | null | The structural evolution of epitaxial mono-oriented (i.e. with the c-axis
perpendicular to the interface) ferroelectric Pb(Zr0.2,Ti0.8)O3 thin film has
been investigated, using high resolution, temperature dependent, X-ray
diffraction. The full set of lattice parameters was obtained, it allowed to
estimate the variation of the polarization as a function of temperature,
underlying the difference between the polarization-induced tetragonality and
the elastic one. The temperature evolution of the misfit strain has been
calculated and found to be in good agreement with the theoretical
temperature-misfit strain phase diagram
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:24:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Janolin",
"Pierre-Eymeric",
""
],
[
"Fraisse",
"Bernard",
""
],
[
"Marrec",
"Francoise Le",
""
],
[
"Dkhil",
"Brahim",
""
]
] |
0705.3355 | Olivier Villain | Olivier Villain (IMPMC), Georges Calas (IMPMC), Laurence Galoisy
(IMPMC), Laurent Cormier (IMPMC), Jean-Louis Hazemann | XANES determination of chromium oxidation states in glasses: comparison
with optical absorption spectroscopy | null | null | null | null | cond-mat.mtrl-sci | null | The oxidation state of chromium in glasses melted in an air atmosphere with
and without refining agents was investigated by Cr K-edge X-ray Absorption
Near-Edge Structure (XANES) and optical absorption spectroscopy. A good
agreement in the relative proportion of Cr(III) and Cr(VI) is obtained between
both methods. We show that the chemical dependence of the absorption
coefficient of Cr(III) is less important in XANES than in optical absorption
spectroscopy. The comparison of glasses melted under different conditions
provides an indirect assessment of the molar extinction coefficient of Cr(VI)
in glasses.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:19:13 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Villain",
"Olivier",
"",
"IMPMC"
],
[
"Calas",
"Georges",
"",
"IMPMC"
],
[
"Galoisy",
"Laurence",
"",
"IMPMC"
],
[
"Cormier",
"Laurent",
"",
"IMPMC"
],
[
"Hazemann",
"Jean-Louis",
""
]
] |
0705.3356 | Seyyed Masih Ayat | Seyed Masih Ayat | The Skolem-Bang Theorems in Ordered Fields with an $IP$ | 28 pages | null | null | null | math.LO | null | This paper is concerned with the extent to which the Skolem-Bang theorems in
Diophantine approximations generalise from the standard setting of $<R,Z>$ to
structures of the form $<F,I>$, where $F$ is an ordered field and $I$ is an
integer part of $F$. We show that some of these theorems are hold
unconditionally in general case (ordered fields with an integer part). The
remainder results are based on Dirichlet's and Kronecker's theorems. Finally we
extend Dirichlet's theorem to ordered fields with $IE_1$ integer part.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:19:14 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Ayat",
"Seyed Masih",
""
]
] |
0705.3357 | Alain Pham Ngoc Dinh | Alain Pham Ngoc Dinh (MAPMO), Pham Hoang Quan, Dang Duc Trong | A nonlinearly ill-posed problem of reconstructing the temperature from
interior data | 24 pages | Numerical Functional Analysis and Optimization / Numerical
Functional Analysis and Optimization An International Journal 29, 3-4 (2008)
445-469 | null | null | math.AP | null | We consider the problem of reconstructing, from the interior data $u(x,1)$, a
function $u$ satisfying a nonlinear elliptic equation $$ \Delta u =
f(x,y,u(x,y)), x \in \RR, y > 0. $$
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:19:50 GMT"
}
] | 2009-11-11T00:00:00 | [
[
"Dinh",
"Alain Pham Ngoc",
"",
"MAPMO"
],
[
"Quan",
"Pham Hoang",
""
],
[
"Trong",
"Dang Duc",
""
]
] |
0705.3358 | Kouichi Takemura | Kouichi Takemura | Integral representation of solutions to Fuchsian system and Heun's
equation | 21 pages | null | 10.1016/j.jmaa.2007.11.015 | null | math.CA math-ph math.MP nlin.SI | null | We obtain integral representations of solutions to special cases of the
Fuchsian system of differential equations and Heun's differential equation. In
particular, we calculate the monodromy of solutions to the Fuchsian equation
that corresponds to Picard's solution of the sixth Painlev\'e equation, and to
Heun's equation.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:23:50 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 05:54:50 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Takemura",
"Kouichi",
""
]
] |
0705.3359 | Dimitrios Gouliermis | Dimitrios A. Gouliermis, Sascha P. Quanz, Thomas Henning | Clustered Star Formation in the Small Magellanic Cloud. A Spitzer/IRAC
View of the Star-Forming Region NGC 602/N 90 | Accepted fro Publication in ApJ. 8 pages, 6 figures, 3 color figures
submitted as JPG | Astrophys.J.665:306-314,2007 | 10.1086/519308 | null | astro-ph | null | We present Spitzer/IRAC photometry on the star-forming HII region N 90,
related to the young stellar association NGC 602 in the Small Magellanic Cloud.
Our photometry revealed bright mid-infrared sources, which we classify with the
use of a scheme based on templates and models of red sources in the Milky Way,
and criteria recently developed from the Spitzer Survey of the SMC for the
selection of candidate Young Stellar Objects (YSOs). We detected 57 sources in
all four IRAC channels in a 6.2' x 4.8' field-of-view centered on N 90; 22 of
these sources are classified as candidate YSOs. We compare the locations of
these objects with the position of optical sources recently found in the same
region with high-resolution HST/ACS imaging of NGC 602, and we find that 17
candidate YSOs have one or more optical counterparts. All of these optical
sources are identified as pre-main sequence stars, indicating, thus, ongoing
clustered star formation events in the region. The positions of the detected
YSOs and their related PMS clusters give a clear picture of the current star
formation in N 90, according to which the young stellar association
photo-ionizes the surrounding interstellar medium, revealing the HII nebula,
and triggering sequential star formation events mainly along the eastern and
southern rims of the formed cavity of the parental molecular cloud.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:26:46 GMT"
}
] | 2010-05-12T00:00:00 | [
[
"Gouliermis",
"Dimitrios A.",
""
],
[
"Quanz",
"Sascha P.",
""
],
[
"Henning",
"Thomas",
""
]
] |
0705.3360 | Kyriakos Sgarbas | Kyriakos N. Sgarbas | The Road to Quantum Artificial Intelligence | 9 pages. Presented at PCI-2007: 11th Panhellenic Conference in
Informatics, 18-20 May 2007, Patras, Greece | In: T.S.Papatheodorou, D.N.Christodoulakis and N.N.Karanikolas
(eds), "Current Trends in Informatics", Vol.A, pp.469-477, New Technologies
Publications, Athens, 2007 (SET 978-960-89784-0-9) | null | null | cs.AI | null | This paper overviews the basic principles and recent advances in the emerging
field of Quantum Computation (QC), highlighting its potential application to
Artificial Intelligence (AI). The paper provides a very brief introduction to
basic QC issues like quantum registers, quantum gates and quantum algorithms
and then it presents references, ideas and research guidelines on how QC can be
used to deal with some basic AI problems, such as search and pattern matching,
as soon as quantum computers become widely available.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:31:47 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Sgarbas",
"Kyriakos N.",
""
]
] |
0705.3361 | Takeshi Mizushima | T. Mizushima, M. Ichioka, K. Machida | Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC
Crossover Regime | 16 pages, 13 figures, replaced by the version to appear in J. Phys.
Soc. Jpn | J. Phys. Soc. Jpn. 76, 104006 (2007) | 10.1143/JPSJ.76.104006 | null | cond-mat.supr-con | null | We theoretically investigate the ground state of trapped neutral fermions
with population imbalance in the BCS-BEC crossover regime. On the basis of the
single-channel Hamiltonian, we perform full numerical calculations of the
Bogoliubov-de Gennes equation coupled with the regularized gap and number
equations. The zero-temperature phase diagram in the crossover regime is
presented, where the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing state
governs the weak-coupling BCS region of a resonance. It is found that the FFLO
oscillation vanishes in the BEC side, in which the system under population
imbalance turns into a phase separation (PS) between locally binding superfluid
and fully polarized spin domains. We also demonstrate numerical calculations
with a large particle number O(10^5), comparable to that observed in recent
experiments. The resulting density profile on a resonance yields the PS, which
is in good agreement with the recent experiments, while the FFLO modulation
exists in the pairing field. It is also proposed that the most favorable
location for the detection of the FFLO oscillation is in the vicinity of the
critical population imbalance in the weak coupling BCS regime, where the
oscillation periodicity becomes much larger than the interparticle spacing.
Finally, we analyze the radio-frequency (RF) spectroscopy in the imbalanced
system. The clear difference in the RF spectroscopy between BCS and BEC sides
reveals the structure of the pairing field and local ``magnetization''.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:33:37 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 12:11:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mizushima",
"T.",
""
],
[
"Ichioka",
"M.",
""
],
[
"Machida",
"K.",
""
]
] |
0705.3362 | Hao Wu | Hao Wu | Convergence to Equilibrium for the Cahn-Hilliard Equation with Wentzell
Boundary Condition | 25 pages | Asymptotic Analysis, 54(1&2) (2007), 71?C92. | null | null | math.AP | null | In this paper we consider the Cahn-Hilliard equation endowed with Wentzell
boundary condition which is a model of phase separation in a binary mixture
contained in a bounded domain with permeable wall. Under the assumption that
the nonlinearity is analytic with respect to unknown dependent function, we
prove the convergence of a global solution to an equilibrium as time goes to
infinity by means of a suitable \L ojasiewicz-Simon type inequality with
boundary term. Estimates of convergence rate are also provided.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:34:02 GMT"
}
] | 2008-04-14T00:00:00 | [
[
"Wu",
"Hao",
""
]
] |
0705.3363 | G P Procopio | Alessandro Fabbri, Giovanni Paolo Procopio | The Holographic Interpretation of Hawking Radiation | 10 pages, 1 figure, Honorable Mention in the Gravity Research
Foundation Essay Competition 2007 | Int.J.Mod.Phys.D17:2433-2438,2009 | 10.1142/S0218271808014102 | DAMTP-2007-45 | gr-qc hep-th | null | Holography gives us a tool to view the Hawking effect from a new, classical
perspective. In the context of Randall-Sundrum braneworld models, we show that
the basic features of four-dimensional evaporating solutions are nicely
translated into classical five-dimensional language. This includes the dual
bulk description of particles tunneling through the horizon.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:48:04 GMT"
}
] | 2009-03-20T00:00:00 | [
[
"Fabbri",
"Alessandro",
""
],
[
"Procopio",
"Giovanni Paolo",
""
]
] |
0705.3364 | Azita Mayeli | Azita Mayeli | Mexican Hat Wavelet on the Heisenberg Group | 8 pages, no figures | null | null | null | math.FA math.GR | null | In this article wavelets (admissible vectors) on the Heisenberg group are
studied from the point of view of Calderon's formula. Further we shall show
that for the class of Schwartz functions the Calderon admissibility condition
is equivalent to the usual admissibility property which will be introduced in
this work. Furthermore motivated by a well-known example on the real line, the
Mexican-Hat wavelet, we demonstrate the existence and construction of an
analogous wavelet on the Heisenberg Lie group with 2 vanishing moments, which
together with all of its derivatives has Gaussian decay.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:46:49 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Mayeli",
"Azita",
""
]
] |
0705.3365 | Serhiy Zhuk M. | Serhiy Zhuk | On Some Properties of Linear Mapping Induced by Linear Descriptor
Differential Equation | Reported at int.conf.MAA-2007,Odessa, Ukraine
(http://maa2007.onu.edu.ua/), submitted to Nonlinear Oscillations
(http://www.springerlink.com/content/108782/), 8 pages | null | null | null | math.CA math.OC | null | In this paper we introduce linear mapping D from WnF\subset Ln into Lm\times
Rm, induced by linear differential equation d/dt
Fx(t)-C(t)x(t)=f(t),Fx(t_0)=f_0. We prove that D is closed dense defined
mapping for any m\times n-matrix F. Also adjoint mapping D* is constructed and
its domain WmF is described. Some kind of so-called "integration by parts"
formula for vectors from WnF, WmF is suggested. We obtain a necessary and
sufficient condition for existence of generalized solution of equation
Dx=(f,f_0). Also we find a sufficient criterion for closureness of the R(D) in
Lm\times Rm which is formulated in terms of transparent conditions for blocks
of matrix C(t). Some examples are supplied to illustrate obtained results.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:50:30 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Zhuk",
"Serhiy",
""
]
] |
0705.3366 | George Gratzer | G. Gr\"atzer and E. Knapp | Notes on planar semimodular lattices. I. Construction | 13 pages with 9 diagrams | null | null | null | math.GM | null | We construct all planar semimodular lattices in three simple steps from the
direct product of two chains.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 21:35:28 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Grätzer",
"G.",
""
],
[
"Knapp",
"E.",
""
]
] |
0705.3367 | Attilio Cucchieri | A. Cucchieri, T. Mendes, O. Oliveira and P. J. Silva | Just how different are SU(2) and SU(3) Landau-gauge propagators in the
IR regime? | 5 pages, 1 table, 4 figures; modified title, abstract and text; added
references; to appear in Phys. Rev. D; | Phys.Rev.D76:114507,2007 | 10.1103/PhysRevD.76.114507 | null | hep-lat | null | The infrared behavior of gluon and ghost propagators in Yang-Mills theories
is of central importance for understanding quark and gluon confinement in QCD.
While simulations of pure SU(3) gauge theory correspond to the physical case in
the limit of infinite quark mass, the SU(2) case (i.e. pure two-color QCD) is
usually employed as a simplification, in the hope that qualitative features be
the same as for the SU(3) case. Here we carry out the first comparative study
of lattice (Landau) propagators for these two gauge groups. Our data were
especially produced with equivalent lattice parameters in order to allow a
careful comparison of the two cases. We find very good agreement between SU(2)
ans SU(3) propagators, showing that in the IR limit the equivalence of the two
cases is quantitative, at least down to about 1 GeV. Our results suggest that
the infrared behavior of these propagators is independent of the gauge group
SU(N_c), as predicted by Schwinger-Dyson equations.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 17:17:39 GMT"
},
{
"version": "v2",
"created": "Sun, 4 Nov 2007 08:25:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cucchieri",
"A.",
""
],
[
"Mendes",
"T.",
""
],
[
"Oliveira",
"O.",
""
],
[
"Silva",
"P. J.",
""
]
] |
0705.3368 | Dmitry Shirokov | Dmitry Shirokov | A classification of Lie algebras of pseudounitary groups in the
techniques of Clifford algebras | 18 pages | AACA, 20:2, 2010, 411-425 | 10.1007/s00006-009-0177-0 | null | math-ph math.MP | null | In this paper we present new formulas, which represent commutators and
anticommutators of Clifford algebra elements as sums of elements of different
ranks. Using these formulas we consider subalgebras of Lie algebras of
pseudounitary groups. Our main techniques are Clifford algebras. We have find
12 types of subalgebras of Lie algebras of pseudounitary groups.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:36:07 GMT"
}
] | 2016-08-29T00:00:00 | [
[
"Shirokov",
"Dmitry",
""
]
] |
0705.3369 | Andreas Gustavsson | Andreas Gustavsson | Closed non-abelian strings | 27 pages | Nucl.Phys.B814:53-75,2009 | 10.1016/j.nuclphysb.2009.01.015 | null | hep-th | null | With the aim of finding a framework for describing $(2,0)$ theory, we propose
a non-abelian gerbe with surface holonomies that can parallel transport closed
strings only.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:23:45 GMT"
},
{
"version": "v2",
"created": "Sat, 25 Aug 2007 18:25:05 GMT"
}
] | 2009-03-24T00:00:00 | [
[
"Gustavsson",
"Andreas",
""
]
] |
0705.3370 | Ivan Yu. Tyukin | Ivan Tyukin, Danil Prokhorov, Cees van Leeuwen | Adaptive classification of temporal signals in fixed-weights recurrent
neural networks: an existence proof | 22 pages | null | null | null | math.OC math.DS | null | We address the important theoretical question why a recurrent neural network
with fixed weights can adaptively classify time-varied signals in the presence
of additive noise and parametric perturbations. We provide a mathematical proof
assuming that unknown parameters are allowed to enter the signal nonlinearly
and the noise amplitude is sufficiently small.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:30:40 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Tyukin",
"Ivan",
""
],
[
"Prokhorov",
"Danil",
""
],
[
"van Leeuwen",
"Cees",
""
]
] |
0705.3371 | Betty Abelev | Betty I. Abelev (for the STAR Collaboration) | Multi-strange baryon correlations at RHIC | 8 pages, 4 figures | null | null | null | nucl-ex | null | Multi-strange baryon azimuthal correlations were observed in d+Au and Au+Au
data taken by the STAR detector at RHIC. We extract the same-side per-trigger
yields for a variety of strange particle species and trigger pt, but do not
observe any species dependence. We also report the observation of an elongation
in the Delta-eta; direction of the Xi correlation peak, the ridge. Comparing
the same-side yields in d+Au and Au+Au data, we conclude that the same-side
yield of the azimuthal-only Xi correlations is greatly enhanced by the ridge
yield. We also report the first observation of a strong same-side peak in the
Omega baryon triggered azimuthal correlations.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:58:18 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Abelev",
"Betty I.",
"",
"for the STAR Collaboration"
]
] |
0705.3372 | Alexander Schmidt | Alexander Schmidt | Rings of integers of type $K(\pi,1)$ | final version, to appear in documenta mathematica | null | null | null | math.NT | null | We investigate the Galois group $G_S(p)$ of the maximal $p$-extension
unramified outside a finite $S$ of primes of a number field in the (tame) case,
when no prime dividing $p$ is in $S$. We show that the cohomology of $G_S(p)$
is 'often' isomorphic to the etale cohomology of the scheme $\Spec(\O_k \sm
S)$, in particular, $G_S(p)$ is of cohomological dimension~2 then.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:34:35 GMT"
},
{
"version": "v2",
"created": "Wed, 14 Nov 2007 04:18:05 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Schmidt",
"Alexander",
""
]
] |
0705.3373 | Anirban Banerjee | Anirban Banerjee and J\"urgen Jost | Laplacian Spectrum and Protein-Protein Interaction Networks | 7 pages, 3 figures | null | null | null | q-bio.QM physics.data-an q-bio.PE | null | From the spectral plot of the (normalized) graph Laplacian, the essential
qualitative properties of a network can be simultaneously deduced. Given a
class of empirical networks, reconstruction schemes for elucidating the
evolutionary dynamics leading to those particular data can then be developed.
This method is exemplified for protein-protein interaction networks. Traces of
their evolutionary history of duplication and divergence processes are
identified. In particular, we can identify typical specific features that
robustly distinguish protein-protein interaction networks from other classes of
networks, in spite of possible statistical fluctuations of the underlying data.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:34:45 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Banerjee",
"Anirban",
""
],
[
"Jost",
"Jürgen",
""
]
] |
0705.3374 | Latha Venkataraman | Jordan R. Quinn, Frank W. Foss Jr., Latha Venkataraman, Mark S.
Hybertsen, and Ronald Breslow | Single-Molecule Junction Conductance through Diaminoacenes | 2 pages, 3 figures | JACS 2007, 129, 6714-6715 | 10.1021/ja0715804 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | The study of electron transport through single molecules is essential to the
development of molecular electronics. Indeed, trends in electronic conductance
through organic nanowires have emerged with the increasing reliability of
electron transport measurements at the single-molecule level. Experimental and
theoretical work has shown that tunneling distance, HOMO-LUMO gap and molecular
conformation influence electron transport in both saturated and pi-conjugated
nanowires. However, there is relatively little experimental data on electron
transport through fused aromatic rings. Here we show using diaminoacenes that
conductivity depends not only on the number of fused aromatic rings in the
molecule, which defines the molecular HOMO-LUMO gap, but also on the position
of the amino groups on the rings. Specifically, we find that conductance is
highest with minimal disruption of aromaticity in fused aromatic nanowires.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:40:03 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Quinn",
"Jordan R.",
""
],
[
"Foss",
"Frank W.",
"Jr."
],
[
"Venkataraman",
"Latha",
""
],
[
"Hybertsen",
"Mark S.",
""
],
[
"Breslow",
"Ronald",
""
]
] |
0705.3375 | Antonio De Felice | Antonio De Felice, Mark Hindmarsh | Unsuccessful cosmology with Modified Gravity Models | 16 pages, uses RevTeX | JCAP 0706:028,2007 | 10.1088/1475-7516/2007/06/028 | null | astro-ph gr-qc hep-th | null | A class of Modified Gravity Models, consisting of inverse powers of linear
combination of quadratic curvature invariants, is studied in the full parameter
space. We find that singularity-free cosmological solutions, interpolating
between an almost-Friedmann universe at Big Bang Nucleosynthesis and an
accelerating universe today, exist only in a restricted parameter space.
Furthermore, for all parameters of the models, there is an unstable scalar mode
of the gravitational field. Therefore we conclude that this class of Modified
Gravity Models is not viable.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:43:06 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 15:12:56 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"De Felice",
"Antonio",
""
],
[
"Hindmarsh",
"Mark",
""
]
] |
0705.3376 | Michael G. Moore | Y. P. Huang and M. G. Moore | Gaussian number-squeezed states for sub-shot-noise interferometery in
double-well Bose-Einstein condensates | Withdrawn | null | null | null | quant-ph cond-mat.other | null | This paper has been withdrawn. It is based on numerical results limited by
computing resources to N=3000 atoms. Using a newly understood geometric method
we find that the observed scaling with N saturates at around N=7000 or even
higher. In light of this new finding we withdraw the paper and will submit a
revised manuscript reflecting our new understanding.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:51:46 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 20:35:27 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Huang",
"Y. P.",
""
],
[
"Moore",
"M. G.",
""
]
] |
0705.3377 | Daniela Calzetti | D. Calzetti (1,2), R. C. Kennicutt (3), C. W. Engelbracht (4), C.
Leitherer (2), B. T. Draine (5), L. Kewley (6), J. Moustakas (7), M. Sosey
(2), D.A. Dale (8), K. D. Gordon (4), G.X. Helou (9), D.J. Hollenbach (10),
L. Armus (9), G. Bendo (11), C. Bot (9), B. Buckalew (9), T. Jarrett (9), A.
Li (12), M. Meyer (2), E.J. Murphy (13), M. Prescott (4), M. W. Regan (2), G.
H. Rieke (4), H. Roussel (14), K. Sheth (9), J. D. T. Smith (4), M. D.
Thornley (15), F. Walter (14) ((1) Dept. of Astronomy, University of
Massachusetts; (2) Space Telescope Science Institute; (3) Institute of
Astronomy, Cambridge University; (4) Steward Observatory, University of
Arizona; (5) Princeton University Observatory; (6) Institute for Astronomy,
University of Hawaii; (7) Dept. of Physics, New York University; (8) Dept. of
Physics and Astronomy, University of Wyoming; (9) Spitzer Science Center,
Caltech; (10) NASA/Ames Research Center; (11) Astrophysics Group, Imperial
College; (12) Dept. of Physics and Astronomy, University of Missouri; (13)
Dept. of Astronomy, Yale University; (14) Max Planck Institut fur Astronomie,
Heidelberg; (15) Dept. of Physics and Astronomy, Bucknell University) | The Calibration of Mid-Infrared Star Formation Rate Indicators | 67 pages, 15 figures, accepted for publication on the Astrophysical
Journal; replacement contains: correction to equation 8; important tweaks to
equation 9; various typos corrected | Astrophys.J.666:870-895,2007 | 10.1086/520082 | null | astro-ph | null | With the goal of investigating the degree to which the mid-infrared emission
traces the star formation rate (SFR), we analyze Spitzer 8 um and 24 um data of
star-forming regions in a sample of 33 nearby galaxies with available
HST/NICMOS images in the Paschen-alpha (1.8756 um) emission line. The galaxies
are drawn from the Spitzer Infrared Nearby Galaxies Survey (SINGS) sample, and
cover a range of morphologies and a factor ~10 in oxygen abundance. Published
data on local low-metallicity starburst galaxies and Luminous Infrared Galaxies
are also included in the analysis. Both the stellar-continuum-subtracted 8 um
emission and the 24 um emission correlate with the extinction-corrected
Pa-alpha line emission, although neither relationship is linear. Simple models
of stellar populations and dust extinction and emission are able to reproduce
the observed non-linear trend of the 24 um emission versus number of ionizing
photons, including the modest deficiency of 24 um emission in the low
metallicity regions, which results from a combination of decreasing dust
opacity and dust temperature at low luminosities. Conversely, the trend of the
8 um emission as a function of the number of ionizing photons is not well
reproduced by the same models. The 8 um emission is contributed, in larger
measure than the 24 um emission, by dust heated by non-ionizing stellar
populations, in agreement with previous findings. Two SFR calibrations, one
using the 24 um emission and the other using a combination of the 24 um and
H-alpha luminosities (Kennicutt et al. 2007), are presented. No calibration is
presented for the 8 um emission, because of its significant dependence on both
metallicity and environment. The calibrations presented here should be directly
applicable to systems dominated by on-going star formation.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 16:33:30 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jul 2007 21:04:59 GMT"
}
] | 2010-04-06T00:00:00 | [
[
"Calzetti",
"D.",
""
],
[
"Kennicutt",
"R. C.",
""
],
[
"Engelbracht",
"C. W.",
""
],
[
"Leitherer",
"C.",
""
],
[
"Draine",
"B. T.",
""
],
[
"Kewley",
"L.",
""
],
[
"Moustakas",
"J.",
""
],
[
"Sosey",
"M.",
""
],
[
"Dale",
"D. A.",
""
],
[
"Gordon",
"K. D.",
""
],
[
"Helou",
"G. X.",
""
],
[
"Hollenbach",
"D. J.",
""
],
[
"Armus",
"L.",
""
],
[
"Bendo",
"G.",
""
],
[
"Bot",
"C.",
""
],
[
"Buckalew",
"B.",
""
],
[
"Jarrett",
"T.",
""
],
[
"Li",
"A.",
""
],
[
"Meyer",
"M.",
""
],
[
"Murphy",
"E. J.",
""
],
[
"Prescott",
"M.",
""
],
[
"Regan",
"M. W.",
""
],
[
"Rieke",
"G. H.",
""
],
[
"Roussel",
"H.",
""
],
[
"Sheth",
"K.",
""
],
[
"Smith",
"J. D. T.",
""
],
[
"Thornley",
"M. D.",
""
],
[
"Walter",
"F.",
""
]
] |
0705.3378 | Han Geurdes | J.F. Geurdes | Bell's Theorem refuted with a Kolmogorovian counterexample | 12 pages 0 figures | Int J Theoretical Phys, Grp Theor & Nonl Optics 12(3), p215-228,
2008 (NOVA) | null | null | physics.gen-ph | null | The statistics behind Bell's inequality is demonstrated to allow a
Kolmogorovian (i.e. classical) model of probabilities that recovers the quantum
covariance.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:44:10 GMT"
}
] | 2008-11-24T00:00:00 | [
[
"Geurdes",
"J. F.",
""
]
] |
0705.3379 | Pietro Bolli | Luca Olmi and Pietro Bolli | Ray-tracing and physical-optics analysis of the aperture efficiency in a
radio telescope | 34 pages, 7 figures | null | 10.1364/AO.46.004092 | null | physics.optics physics.ins-det | null | The performance of telescope systems working at microwave or visible/IR
wavelengths is typically described in terms of different parameters according
to the wavelength range. Most commercial ray tracing packages have been
specifically designed for use with visible/IR systems and thus, though very
flexible and sophisticated, do not provide the appropriate parameters to fully
describe microwave antennas, and thus to compare with specifications. In this
work we demonstrate that the Strehl ratio is equal to the phase efficiency when
the apodization factor is taken into account. The phase efficiency is the most
critical contribution to the aperture efficiency of an antenna, and the most
difficult parameter to optimize during the telescope design. The equivalence
between the Strehl ratio and the phase efficiency gives the designer/user of
the telescope the opportunity to use the faster commercial ray-tracing software
to optimize the design. We also discuss the results of several tests performed
to check the validity of this relationship that we carried out using a
ray-tracing software, ZEMAX and a full Physical Optics software, GRASP9.3,
applied to three different telescope designs that span a factor of $\simeq 10
in terms of D/lambda. The maximum measured discrepancy between phase efficiency
and Strehl ratio varies between $\simeq 0.4 and 1.9 up to an offset angle of
>40 beams, depending on the optical configuration, but it is always less than
0.5 where the Strehl ratio is >0.95.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:53:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Olmi",
"Luca",
""
],
[
"Bolli",
"Pietro",
""
]
] |
0705.3380 | Jose M. M. Senovilla | Marc Mars, Jos\'e M. M. Senovilla, Ra\"ul Vera | Lorentzian and signature changing branes | 23 pages, 2 figures | Phys.Rev.D76:044029,2007 | 10.1103/PhysRevD.76.044029 | null | hep-th gr-qc | null | General hypersurface layers are considered in order to describe brane-worlds
and shell cosmologies. No restriction is placed on the causal character of the
hypersurface which may thus have internal changes of signature. Strengthening
the results in our previous letter [1], we confirm that a good, regular and
consistent description of signature change is achieved in these brane/shells
scenarios, while keeping the hypersurface and the bulk completely regular. Our
formalism allows for a unified description of the traditional timelike
branes/shells together with the signature-changing, or pure null, ones. This
allows for a detailed comparison of the results in both situations. An
application to the case of hypersurface layers in static bulks is presented,
leading to the general Robertson-Walker geometry on the layer --with a possible
signature change. Explicit examples on anti de Sitter bulks are then studied.
The permitted behaviours in different settings ($Z_{2}$-mirror branes,
asymmetric shells, signature-changing branes) are analysed in detail. We show
in particular that (i) in asymmetric shells there is an upper bound for the
energy density, and (ii) that the energy density within the brane vanishes when
approaching a change of signature. The description of a signature change as a
`singularity' seen from within the brane is considered. We also find new
relations between the fundamental constants in the brane/shell, its tension,
and the cosmological and gravitational constants of the bulk, independently of
the existence or not of a change of signature.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:54:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mars",
"Marc",
""
],
[
"Senovilla",
"José M. M.",
""
],
[
"Vera",
"Raül",
""
]
] |
0705.3381 | Philippe Caillol | P. Caillol and M. Ruderman | Absolute and convective instabilities in an inviscid compressible mixing
layer | 5 pages, 6 figures, accepted by Astronomical Notes (Astron.
Nachrichten) | null | 10.1002/asna.200710785 | null | astro-ph | null | We consider the stability of a compressible shear flow separating two streams
of different speeds and temperatures. The velocity and temperature profiles in
this mixing layer are hyperbolic tangents.
The normal mode analysis of the flow stability reduces to an eigenvalue
problem for the pressure perturbation. We briefly describe the numerical method
that we used to solve this problem. Then, we introduce the notions of the
absolute and convective instabilities and examine the effects of Mach number,
and the velocity and temperature ratios of each stream on the transition
between convective and absolute instabilities. Finally, we discuss the
implication of the results presented in this paper for the heliopause
stability.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 13:58:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Caillol",
"P.",
""
],
[
"Ruderman",
"M.",
""
]
] |
0705.3382 | Yuly Billig | Yuly Billig, Karl-Hermann Neeb | On the cohomology of vector fields on parallelizable manifolds | null | null | null | null | math.RT math.RA | null | In the present paper we determine for each parallelizable smooth compact
manifold $M$ the cohomology spaces $H^2(V_M,\bar\Omega^p_M)$ of the Lie algebra
$V_M$ of smooth vector fields on $M$ with values in the module $\bar\Omega^p_M
= \Omega^p_M/d\Omega^{p-1}_M$. The case of $p=1$ is of particular interest
since the gauge algebra $C^\infty (M,k)$ has the universal central extension
with center $\bar\Omega^1_M$, generalizing affine Kac-Moody algebras. The
second cohomology $H^2(V_M, \bar\Omega^1_M)$ classifies twists of the
semidirect product of $V_M$ with the universal central extension $C^\infty
(M,k) \oplus \bar\Omega^1_M$.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:00:34 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Billig",
"Yuly",
""
],
[
"Neeb",
"Karl-Hermann",
""
]
] |
0705.3383 | Viviane Baladi | V. Baladi and D. Smania | Linear response formula for piecewise expanding unimodal maps | We added Theorem 7.1 which shows that the horizontality condition is
necessary. The paper "Smooth deformations..." containing Thm 2.8 is now
available on the arxiv; see also Corrigendum arXiv:1205.5468 (to appear
Nonlinearity 2012) | Nonlinearity, 21 (2008) 677-711 | 10.1088/0951-7715/21/4/003 | null | math.DS | null | The average R(t) of a smooth function with respect to the SRB measure of a
smooth one-parameter family f_t of piecewise expanding interval maps is not
always Lipschitz. We prove that if f_t is tangent to the topological class of
f_0, then R(t) is differentiable at zero, and the derivative coincides with the
resummation previously proposed by the first named author of the (a priori
divergent) series given by Ruelle's conjecture.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:03:57 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Sep 2007 12:25:32 GMT"
},
{
"version": "v3",
"created": "Fri, 19 Oct 2007 15:52:32 GMT"
}
] | 2012-05-28T00:00:00 | [
[
"Baladi",
"V.",
""
],
[
"Smania",
"D.",
""
]
] |
0705.3384 | Sebastien Forget | Sebastien Chenais (LPL), Sebastien Forget (LPL), Laurent Philippet
(LPL), Marie-Claude Castex (LPL) | Enhanced generation of VUV radiation by four-wave mixing in mercury
using pulsed laser vaporization | null | null | 10.1007/s00340-007-2782-8 | null | physics.optics | null | The efficiency of a coherent VUV source at 125 nm, based on 2-photon resonant
four-wave mixing in mercury vapor, has been enhanced by up to 2 orders of
magnitude. This enhancement was obtained by locally heating a liquid Hg surface
with a pulsed excimer laser, resulting in a high density vapor plume in which
the nonlinear interaction occurred. Energies up to 5 μJ (1 kW peak power)
have been achieved while keeping the overall Hg cell at room temperature,
avoiding the use of a complex heat pipe. We have observed a strong saturation
of the VUV yield when peak power densities of the fundamental beams exceed the
GW/cm2 range, as well as a large intensity-dependant broadening (up to ~30
cm-1) of the two-photon resonance. The source has potential applications for
high resolution interference lithography and photochemistry.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:04:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chenais",
"Sebastien",
"",
"LPL"
],
[
"Forget",
"Sebastien",
"",
"LPL"
],
[
"Philippet",
"Laurent",
"",
"LPL"
],
[
"Castex",
"Marie-Claude",
"",
"LPL"
]
] |
0705.3385 | Hans-Werner Hammer | M.A. Belushkin, H.-W. Hammer, U.-G. Mei{\ss}ner | Model-independent extraction of two-photon effects in elastic
electron-proton scattering | 7 pages, 2 figures | Phys.Lett.B658:138-142,2008 | 10.1016/j.physletb.2007.10.031 | HISKP-TH-07/14, FZJ-TH-2007-16 | hep-ph nucl-th | null | We address the discrepancy between the Rosenbluth and polarization transfer
data for the electromagnetic form factors of the nucleon. Assuming that the
effect of two-photon corrections on the polarization transfer data is
negligible, we obtain a model-independent estimate of the two-photon correction
Delta^(2\gamma). We analyze the polarization transfer data and the cross
section data separately using dispersion relations. A central value as well as
an error estimate for Delta^(2\gamma) is then obtained from a comparison of the
two analyses. The resulting values for Delta^(2\gamma) are in good agreement
with direct calculations available in the literature.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:48:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Belushkin",
"M. A.",
""
],
[
"Hammer",
"H. -W.",
""
],
[
"Meißner",
"U. -G.",
""
]
] |
0705.3386 | Frederic Haglund | Fr\'ed\'eric Haglund (LM-Orsay) | Isometries of CAT(0) cube complexes are semi-simple | null | null | null | null | math.GR | null | We show that an automorphism of an arbitrary CAT(0) cube complex either has a
fixed point or preserves some combinatorial axis. It follows that when a group
contains a distorted cyclic subgroup, it admits no proper action on a discrete
space with walls.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:21:22 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Haglund",
"Frédéric",
"",
"LM-Orsay"
]
] |
0705.3387 | Ulf Saalmann | Ionut Georgescu, Ulf Saalmann and Jan M. Rost | Clusters under strong VUV pulses: A quantum-classical hybrid-description
incorporating plasma effects | 8 pages, 9 figures | Phys. Rev. A 76 (2007) 043203 | 10.1103/PhysRevA.76.043203 | null | physics.atm-clus | null | The quantum-classical hybrid-description of rare-gas clusters interacting
with intense light pulses which we have developed is described in detail. Much
emphasis is put on the treatment of screening electrons in the cluster which
set the time scale for the evolution of the system and form the link between
electrons strongly bound to ions and quasi-free plasma electrons in the
cluster. As an example we discuss the dynamics of an Ar147 cluster exposed to a
short VUV laser pulse of 20eV photon energy.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:42:56 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Georgescu",
"Ionut",
""
],
[
"Saalmann",
"Ulf",
""
],
[
"Rost",
"Jan M.",
""
]
] |
0705.3388 | Rong-Gen Cai | Rong-Gen Cai, Jonathan P. Shock | Holographic Confinement/Deconfinement Phase Transitions of AdS/QCD in
Curved Spaces | Latex, 16pages, v2: minor chnages and a few references added, to
appear in JHEP | JHEP 0708:095,2007 | 10.1088/1126-6708/2007/08/095 | null | hep-th gr-qc hep-ph | null | Recently Herzog has shown that deconfinement of AdS/QCD can be realized, in
the hard-wall model where the small radius region is removed in the
asymptotically AdS space, via a first order Hawking-Page phase transition
between a low temperature phase given by a pure AdS geometry and a high
temperature phase given by the AdS black hole in Poincare coordinates. In this
paper we first extend Herzog's work to the hard wall AdS/QCD model in curved
spaces by studying the thermodynamics of AdS black holes with spherical or
negative constant curvature horizon, dual to a non-supersymmetric Yang-Mills
theory on a sphere or hyperboloid respectively. For the spherical horizon case,
we find that the temperature of the phase transition increases by introducing
an infrared cutoff, compared to the case without the cutoff; For the hyperbolic
horizon case, there is a gap for the infrared cutoff, below which the
Hawking-Page phase transition does not occur. We also discuss charged AdS black
holes in the grand canonical ensemble, corresponding to a Yang-Mills theory at
finite chemical potential, and find that there is always a gap for the infrared
cutoff due to the existence of a minimal horizon for the charged AdS black
holes with any horizon topology.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:26:09 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Aug 2007 00:49:08 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Shock",
"Jonathan P.",
""
]
] |
0705.3389 | Ulf Saalmann | Ionut Georgescu, Ulf Saalmann and Jan M. Rost | Attosecond resolved charging of clusters | 4 pages, 3 figures | Phys. Rev. Lett. 99 (2007) 183002 | 10.1103/PhysRevLett.99.183002 | null | physics.atm-clus | null | Attosecond laser pulses open the door to resolve microscopic electron
dynamics in time. Experiments performed include the decay of a core hole, the
time-resolved measurement of photo ionization and electron tunneling. The
processes investigated share the coherent character of the dynamics involving
very few, ideally one active electron. Here, we introduce a scheme to probe
dissipative multi-electron motion in time. In this context attosecond probing
enables one to obtain information which is lost at later times and cannot be
retrieved by conventional methods in the energy domain due to the incoherent
nature of the dynamics. As a specific example we will discuss the charging of a
rare-gas cluster during a strong femtosecond pulse with attosecond pulses. The
example illustrates the proposed use of attosecond pulses and suggests an
experimental resolution of a controversy about the mechanism of energy
absorption by rare-gas clusters in strong vacuum-ultraviolet (VUV) pulses.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:37:03 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Georgescu",
"Ionut",
""
],
[
"Saalmann",
"Ulf",
""
],
[
"Rost",
"Jan M.",
""
]
] |
0705.3390 | Vadim Shurygin | Vadim V. Shurygin Jr | Product preserving bundle functors on multifibered and multifoliate
manifolds | 16 pages | Lobachevskii Journal of Mathematics, Vol.26, 2007, pp.107-123 | null | null | math.DG | null | We show that the set of the equivalence classes of multifoliate structures is
in one-to-one correspondence with the set of equivalence classes of finite
complete projective systems of vector space epimorphisms. After that we give
the complete description of all product preserving bundle functors on the
categories of multifibered and multifoliate manifolds.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:37:30 GMT"
}
] | 2012-11-28T00:00:00 | [
[
"Shurygin",
"Vadim V.",
"Jr"
]
] |
0705.3391 | Matthias Kleinmann | M. Kleinmann, H. Kampermann, Ph. Raynal, and D. Bruss | Commutator Relations Reveal Solvable Structures in Unambiguous State
Discrimination | 5 pages, discussion of related work added | J. Phys. A: Math. Theor. 40 (2007) F871-F878 | 10.1088/1751-8113/40/36/F04 | null | quant-ph | null | We present a criterion, based on three commutator relations, that allows to
decide whether two self-adjoint matrices with non-overlapping support are
simultaneously unitarily similar to quasidiagonal matrices, i.e., whether they
can be simultaneously brought into a diagonal structure with 2x2-dimensional
blocks. Application of this criterion to unambiguous state discrimination
provides a systematic test whether the given problem is reducible to a solvable
structure. As an example, we discuss unambiguous state comparison.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:38:59 GMT"
},
{
"version": "v2",
"created": "Thu, 31 May 2007 16:02:16 GMT"
}
] | 2007-08-22T00:00:00 | [
[
"Kleinmann",
"M.",
""
],
[
"Kampermann",
"H.",
""
],
[
"Raynal",
"Ph.",
""
],
[
"Bruss",
"D.",
""
]
] |
0705.3392 | Lei Wang | Lei Wang, Wenyu Wang, Jin Min Yang, Huanjun Zhang | Higgs-pair Production in Littlest Higgs Model with T-parity | 11 pages, 3 figs | Phys.Rev.D76:017702,2007 | 10.1103/PhysRevD.76.017702 | null | hep-ph | null | The Higgs-pair production process at the CERN Large Hadron Collider (LHC),
which will provide a way to test the Higgs boson self-coupling, may be
sensitive to new physics. In the framework of the littlest Higgs model with
T-parity, such Higgs-pair production can proceed through additional loop
diagrams and thus the production rate can be quite different from the Standard
Model (SM) prediction. Our calculations show that, due to the loop
contributions of both T-even and T-odd quarks predicted in this model, the
production rate can be significantly enhanced relative to the SM prediction and
also can be larger than the production rate in the minimal supersymmetric
model. Also, we find that the T-odd quark contributions, which were ignored in
a previous study, are equally important compared with the T-even quark
contributions.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:39:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wang",
"Lei",
""
],
[
"Wang",
"Wenyu",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Huanjun",
""
]
] |
0705.3393 | Alvaro de Souza Dutra | Alvaro de Souza Dutra and A. C. Amaro de Faria Jr. (UNESP/Campus de
Guaratingueta-DFQ) | Vacuumless kinks systems from vacuum ones, an example | 11 pages, 4 figures | Phys.Rev.D72:087701,2005 | 10.1103/PhysRevD.72.087701 | null | hep-th | null | Some years ago, Cho and Vilenkin, introduced a model which presents
topological solutions, despite not having degenerate vacua as is usually
expected. Here we present a new model with topological defects, connecting
degenerate vacua but which in a certain limit recovers precisely the one
proposed originally by Cho and Vilenkin. In other words, we found a kind of
parent model for the so called vacuumless model. Then the idea is extended to a
model recently introduced by Bazeia et al. Finally, we trace some comments the
case of the Liouville model.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:39:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dutra",
"Alvaro de Souza",
"",
"UNESP/Campus de\n Guaratingueta-DFQ"
],
[
"Faria",
"A. C. Amaro de",
"Jr.",
"UNESP/Campus de\n Guaratingueta-DFQ"
]
] |
0705.3394 | Arjen van der Wel | A. van der Wel, M. Franx, G.D. Illingworth, P.G. van Dokkum | Low Star Formation Rates for z=1 Early-Type Galaxies in the Very Deep
GOODS-MIPS Imaging: Implications for their Optical/Near-Infrared Spectral
Energy Distributions | Accepted for publication in ApJ, 8 pages, 4 figures, 1 table | Astrophys.J.666:863-869,2007 | 10.1086/520055 | null | astro-ph | null | We measure the obscured star formation in z~1 early-type galaxies. This
constrains the influence of star formation on their optical/near-IR colors,
which, we found, are redder than predicted by the model by Bruzual & Charlot
(2003). From deep ACS imaging we construct a sample of 95 morphologically
selected early-type galaxies in the HDF-N and CDF-S with spectroscopic
redshifts in the range 0.85<z<1.15. We measure their 24 micron fluxes from the
deep GOODS-MIPS imaging and derive the IR luminosities and star formation
rates. The fraction of galaxies with >2 sigma detections (~25 muJy} is
17(-4,+9)%. Of the 15 galaxies with significant detections at least six have an
AGN. Stacking the MIPS images of the galaxies without significant detections
and adding the detected galaxies without AGN we find an upper limit on the mean
star formation rate (SFR) of 5.2+/-3.0 Msol yr^-1, and on the mean specific SFR
of 4.6+/-2.2 * 10^-11 yr^-1. Under the assumption that the average SFR will
decline at the same rate as the cosmic average, the in situ growth in stellar
mass of the early-type galaxy population is less than 14+/-7% between z=1 and
the present. We show that the typically low IR luminosity and SFR imply that
the effect of obscured star formation (or AGN) on their rest-frame
optical/near-IR SEDs is negligible for ~90% of the galaxies in our sample.
Hence, their optical/near-IR colors are most likely dominated by evolved
stellar populations. This implies that the colors predicted by the Bruzual &
Charlot (2003) model for stellar populations with ages similar to those of z~1
early-type galaxies (~1-3 Gyr) are most likely too blue, and that stellar
masses of evolved, high-redshift galaxies can be overestimated by up to a
factor of ~2.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 14:53:36 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"van der Wel",
"A.",
""
],
[
"Franx",
"M.",
""
],
[
"Illingworth",
"G. D.",
""
],
[
"van Dokkum",
"P. G.",
""
]
] |
0705.3395 | Anastasios Avgoustidis | A. Avgoustidis, E.P.S. Shellard | Velocity-Dependent Models for Non-Abelian/Entangled String Networks | 44 pages, 15 figures; v2: Discussion on energy conservation and
non-elasticity added (section IIIA1), bibliography expanded, published
version; v3: typos in string density equations corrected (cf erratum) | Phys.Rev.D78:103510,2008; Erratum-ibid.D80:129907,2009 | 10.1103/PhysRevD.78.103510 10.1103/PhysRevD.80.129907 | UB-ECM-PF-07-11, DAMTP-2007-46 | astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop velocity-dependent models describing the evolution of string
networks that involve several types of interacting strings, each with a
different tension. These incorporate the formation of Y-type junctions with
links stretching between colliding strings, while always ensuring energy
conservation. These models can be used to describe network evolution for
non-abelian strings as well as cosmic superstrings. The application to $Z_{N}$
strings in which interactions are topologically constrained, demonstrates that
a scaling regime is generally reached which involves a hierarchy of string
densities with the lightest most abundant. We also study hybrid networks of
cosmic superstrings, where energetic considerations are more important in
determining interaction outcomes. We again find that networks tend towards
scaling, with the three lightest network components being dominant and having
comparable number densities, while the heavier string states are suppressed. A
more quantitative analysis depends on the precise calculation of the string
interaction matrix using the underlying string or field theory. Nevertheless,
these results provide further evidence that the presence of junctions in a
string network does not obstruct scaling.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 15:18:55 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Nov 2008 17:19:40 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Dec 2009 21:04:31 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Avgoustidis",
"A.",
""
],
[
"Shellard",
"E. P. S.",
""
]
] |
0705.3396 | James Dale | James Dale, Barbara Ercolano, Cathie Clarke | A new algorithm for modelling photoionising radiation in smoothed
particle hydrodynamics | 10 pages, 7 figures, submitted to MNRAS | null | 10.1111/j.1365-2966.2007.12486.x | null | astro-ph | null | We present a new fast algorithm which allows the simulation of ionising
radiation emitted from point sources to be included in high-resolution
three-dimensional smoothed particle hydrodynamics simulations of star cluster
formation. We employ a Str\"omgren volume technique in which we use the
densities of particles near the line-of-sight between the source and a given
target particle to locate the ionisation front in the direction of the target.
Along with one--dimensional tests, we present fully three--dimensional
comparisons of our code with the three--dimensional Monte-Carlo radiative
transfer code, MOCASSIN, and show that we achieve good agreement, even in the
case of highly complex density fields.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 15:24:13 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Dale",
"James",
""
],
[
"Ercolano",
"Barbara",
""
],
[
"Clarke",
"Cathie",
""
]
] |
0705.3397 | Gianpasquale Martelli | Gianpasquale Martelli | Beyond the PI Controllers in First-Order Time-Delay Systems | AMS-LaTeX version 2.20. 12 pages with 6 figures | null | null | null | math.OC | null | In this paper the following three control systems for first-order time-delay
plants are studied and compared: the feedback proportional-integral controller
(PI), the Smith Predictor (SP) and a proposed variable structure consisting of
two blocks. This structure acts as an open-loop proportional controller, after
a setpoint change, and as a closed-loop integrating controller, when the error
enters in a preset band. A chart, provided with the borderlines of the
stability zone and with the curves of two design parameters, is implemented for
each controller. The first parameter is the overshoot of the controlled
variable, evaluated during a step change of the setpoint and made equal to a
preset value. The second parameter, only for the PI and SP controllers, is the
integral of the squared error (ISE), which must have the minimum allowable
value. The ISE is also assumed as comparison index and the proposed controller
appears as the best.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 15:31:11 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Martelli",
"Gianpasquale",
""
]
] |
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