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list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.0298 | Krisztina Eva Gabanyi | K. E. Gabanyi (1,2), N. Marchili (3), T. P. Krichbaum (3), S. Britzen
(3), L. Fuhrmann (3), A. Witzel (3), J. A. Zensus (3), P. Muller (3), X. Liu
(4), H. G. Song (4), J. L. Han (5), X. H. Sun (5) ((1) Hungarian Academy of
Sciences, Research Group for Physical Geodesy and Geodynamics, (2) FOMI,
Satellite Geodetic Observatory, Budapest, Hungary (3) Max-Planck-Institut fur
Radioastronomie, (4) Urumqi Observatory, the National Astronomical
Observatories, the Chinese Academy of Sciences, (5) National Astronomical
Observatories, Chinese Academy of Sciences) | J1128+592: a highly variable IDV source | 5 pages, to be appear in the Astronomische Nachrichten as part of the
conference proceeding of the N+N+N 2007 Workshop for Young Researcher | null | 10.1002/asna.200710818 | null | astro-ph | null | Short time-scale radio variations of compact extragalactic radio quasars and
blazars known as IntraDay Variability (IDV) can be explained in at least some
sources as a propagation effect; the variations are interpreted as
scintillation of radio waves in the turbulent interstellar medium of the Milky
Way. One of the most convincing observational arguments in favor of a
propagation-induced variability scenario is the observed annual modulation in
the characteristic time scale of the variation due to the Earth's orbital
motion. So far there are only two sources known with a well-constrained
seasonal cycle. Annual modulation has been proposed for a few other less
well-documented objects. However, for some other IDV sources source-intrinsic
structural variations which cause drastic changes in the variability time scale
were also suggested. J1128+592 is a recently discovered, highly variable IDV
source. Previous, densely time-sampled flux-density measurements with the
Effelsberg 100-m radio telescope (Germany) and the Urumqi 25-m radio telescope
(China), strongly indicate an annual modulation of the time scale. The most
recent 4 observations in 2006/7, however, do not fit well to the annual
modulation model proposed before. In this paper, we investigate a possible
explanation of this discrepancy.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:42:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gabanyi",
"K. E.",
""
],
[
"Marchili",
"N.",
""
],
[
"Krichbaum",
"T. P.",
""
],
[
"Britzen",
"S.",
""
],
[
"Fuhrmann",
"L.",
""
],
[
"Witzel",
"A.",
""
],
[
"Zensus",
"J. A.",
""
],
[
"Muller",
"P.",
""
],
[
"Liu",
"X.",
""
],
[
"Song",
"H. G.",
""
],
[
"Han",
"J. L.",
""
],
[
"Sun",
"X. H.",
""
]
] |
0705.0299 | Vladimir Matic Milan | V. M. Matic, N. Dj. Lazarov and I. M. Bradaric | Charge transfer mechanism and Tc(x) dependence in Y0.8(Ca)0.2Ba2Cu3O6+x | Four pages of text, 2 figures, corrected typing error in abstract:
Y2+ and Ca3+ replaced by Y3+ and Ca2+. Thw word "each" added in page 3, line
4. Accepted in Superconductor Science and Technology, on 07.Apr.2008, after
having been considerably revised | Supercond. Sci. Technol. 21 (2008) 075012 | 10.1088/0953-2048/21/7/075012 | null | cond-mat.supr-con | null | We propose a model for charge transfer mechanism in Y0.8(Ca)0.2Ba2Cu3O6+x to
count hole doping of CuO2 planes and x dependence of critical transition
temperature T_c. It is assumed the total number of doped holes in the planes is
sum of holes that are introduced through two separate channels: substitution of
Y3+ by Ca2+ and from CuO chains that are longer than a minimal (critical)
length l_min needed for charge transfer to take place. The T_c(x) dependence is
obtained by combining calculated x dependence of doping, p(x), and universal
T_c versus p relation. Although calculated T_c(x) dependences for l_min=3 and
l_min=4 both remarkably correlate to the experimental T_c(x), we argue that the
value l_min=4 gives a reasonable overall agreement.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:46:07 GMT"
},
{
"version": "v2",
"created": "Wed, 2 May 2007 22:11:03 GMT"
},
{
"version": "v3",
"created": "Sun, 6 May 2007 20:38:12 GMT"
},
{
"version": "v4",
"created": "Sat, 19 May 2007 13:11:14 GMT"
},
{
"version": "v5",
"created": "Wed, 9 Apr 2008 00:15:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Matic",
"V. M.",
""
],
[
"Lazarov",
"N. Dj.",
""
],
[
"Bradaric",
"I. M.",
""
]
] |
0705.0300 | Jailson Alcaniz | F.I.M. Pereira, R. SIlva, J.S. Alcaniz | Nonextensive effects on the relativistic nuclear equation of state | 6 pages, 8 figures, LaTeX | Phys.Rev.C76:015201,2007 | 10.1103/PhysRevC.76.015201 | null | nucl-th astro-ph cond-mat.stat-mech | null | The Walecka many-body field theory is investigated in the context of quantum
nonextensive statistical mechanics, characterized by a dimensionless parameter
$q$. We consider nuclear matter described statistically by a power-law
distribution which generalizes the standard Fermi-Dirac distribution ($q = 1$).
We show that the scalar and vector meson fields become more intense due to the
nonextensive effects ($q \neq 1$). From a numerical treatment, we also show
that as the nonextensive parameter $q$ increases, the nucleon effective mass
diminishes and the equation of state becomes stiffer. Finally, the usual
Maxwell construction seems not to be necessary for isotherms with temperatures
in the range 14 Mev$<k_BT<$20 MeV.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 14:56:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pereira",
"F. I. M.",
""
],
[
"SIlva",
"R.",
""
],
[
"Alcaniz",
"J. S.",
""
]
] |
0705.0301 | Stephen King | R.Howl and S.F.King | Planck Scale Unification in a Supersymmetric Standard Model | Minor corrections. 12 pages, 2 figures | Phys.Lett.B652:331-337,2007 | 10.1016/j.physletb.2007.07.035 | SHEP-07-15 | hep-ph | null | We show how gauge coupling unification near the Planck scale $M_P\sim
10^{19}$ GeV can be achieved in the framework of supersymmetry, facilitating a
full unification of all forces with gravity. Below the conventional GUT scale
$M_{GUT}\sim 10^{16}$ GeV physics is described by a Supersymmetric Standard
Model whose particle content is that of three complete $\mathbf{27}$
representations of the gauge group $E_6$. Above the conventional GUT scale the
gauge group corresponds to a left-right symmetric Supersymmetric Pati-Salam
model, which may be regarded as a ``surrogate SUSY GUT'' with all the nice
features of SO(10) but without proton decay or doublet-triplet splitting
problems. At the TeV scale the extra exotic states may be discovered at the
LHC, providing an observable footprint of an underlying $E_6$ gauge group
broken at the Planck scale. Assuming an additional low energy $U(1)_X$ gauge
group, identified as a non-trivial combination of diagonal $E_6$ generators,
the $\mu$ problem of the MSSM can be resolved.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:09:43 GMT"
},
{
"version": "v2",
"created": "Tue, 29 May 2007 16:15:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Howl",
"R.",
""
],
[
"King",
"S. F.",
""
]
] |
0705.0302 | Andreas Leopold Knutsen | Andreas Leopold Knutsen | On two conjectures for curves on $K3$ surfaces | 11 pages | null | null | null | math.AG | null | We prove that the gonality among the smooth curves in a complete linear
system on a $K3$ surface is constant except for the Donagi-Morrison example.
This was proved by Ciliberto and Pareschi under the additional condition that
the linear system is ample.
As a consequence we prove that exceptional curves on $K3$ surfaces satisfy
the Eisenbud-Lange-Martens-Schreyer conjecture and explicitly describe such
curves. They turn out to be natural extensions of the
Eisenbud-Lange-Martens-Schreyer examples of exceptional curves on $K3$
surfaces.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:13:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Knutsen",
"Andreas Leopold",
""
]
] |
0705.0303 | Luis Fernando Alday | Luis F. Alday and Juan Maldacena | Gluon scattering amplitudes at strong coupling | 28 pages, harvmac, v4: minor changes | JHEP 0706:064,2007 | 10.1088/1126-6708/2007/06/064 | null | hep-th | null | We describe how to compute planar gluon scattering amplitudes at strong
coupling in N=4 super Yang Mills by using the gauge/string duality. The
computation boils down to finding a certain classical string configuration
whose boundary conditions are determined by the gluon momenta. The results are
infrared divergent. We introduce the gravity version of dimensional
regularization to define finite quantities. The leading and subleading IR
divergencies are characterized by two functions of the coupling that we compute
at strong coupling. We compute also the full finite form for the four point
amplitude and we find agreement with a recent ansatz by Bern, Dixon and
Smirnov.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:44:54 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 22:16:42 GMT"
},
{
"version": "v3",
"created": "Tue, 5 Jun 2007 23:25:34 GMT"
},
{
"version": "v4",
"created": "Mon, 8 Oct 2007 19:31:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alday",
"Luis F.",
""
],
[
"Maldacena",
"Juan",
""
]
] |
0705.0304 | Nathalie Villa | Martin Paegelow (GEODE), Nathalie Villa (GRIMM), Laurence Cornez
(GEODE), Fr\'ed\'eric Ferraty (GRIMM), Louis Ferr\'e (GRIMM), Pascal Sarda
(GRIMM) | Mod\'elisations prospectives de l'occupation du sol. Le cas d'une
montagne m\'editerran\'eenne | 19 pages | CyberGeo: European Journal of Geography 295 (06/12/2004) 15 pages | null | null | stat.AP stat.ME | null | The authors apply three methods of prospective modelling to high resolution
georeferenced land cover data in a Mediterranean mountain area: GIS approach,
non linear parametric model and neuronal network. Land cover prediction to the
latest known date is used to validate the models. In the frame of
spatial-temporal dynamics in open systems results are encouraging and
comparable. Correct prediction scores are about 73 %. The results analysis
focuses on geographic location, land cover categories and parametric distance
to reality of the residues. Crossing the three models show the high degree of
convergence and a relative similitude of the results obtained by the two
statistic approaches compared to the GIS supervised model. Steps under work are
the application of the models to other test areas and the identification of
respective advantages to develop an integrated model.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:12:51 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 07:28:53 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Paegelow",
"Martin",
"",
"GEODE"
],
[
"Villa",
"Nathalie",
"",
"GRIMM"
],
[
"Cornez",
"Laurence",
"",
"GEODE"
],
[
"Ferraty",
"Frédéric",
"",
"GRIMM"
],
[
"Ferré",
"Louis",
"",
"GRIMM"
],
[
"Sarda",
"Pascal",
"",
"GRIMM"
]
] |
0705.0305 | Omer Blaes | Julian H. Krolik, Shigenobu Hirose, and Omer Blaes | Thermodynamics of an Accretion Disk Annulus with Comparable Radiation
and Gas Pressure | ApJ, in press | Astrophys.J.664:1045-1056,2007 | 10.1086/519515 | null | astro-ph | null | We explore the thermodynamic and global structural properties of a local
patch of an accretion disk whose parameters were chosen so that radiation
pressure and gas pressure would be comparable in magnitude. Heating, radiative
transport, and cooling are computed self-consistently with the structure by
solving the equations of radiation MHD in the shearing-box approximation. Using
a fully 3-d and energy-conserving code, we compute the structure and energy
balance of this disk segment over a span of more than forty cooling times. As
is also true when gas pressure dominates, the disk's upper atmosphere is
magnetically-supported. However, unlike the gas-dominated case, no steady-state
is reached; instead, the total (i.e., radiation plus gas) energy content
fluctuates by factors of 3--4 over timescales of several tens of orbits, with
no secular trend. Because the radiation pressure varies much more than the gas
pressure, the ratio of radiation pressure to gas pressure varies over the
approximate range 0.5--2. The volume-integrated dissipation rate generally
increases with increasing total energy, but the mean trend is somewhat slower
than linear, and the instantaneous dissipation rate is often a factor of two
larger or smaller than the mean for that total energy level. Locally, the
dissipation rate per unit volume scales approximately in proportion to the
current density; the time-average dissipation rate per unit mass is
proportional to m^{-1/2}, where m is the horizontally-averaged mass column
density to the nearer of the top or bottom surface. As in our earlier study of
a gas-dominated shearing-box, we find that energy transport is completely
dominated by radiative diffusion, with Poynting flux carrying less than 1% of
the energy lost from the box.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:15:08 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Krolik",
"Julian H.",
""
],
[
"Hirose",
"Shigenobu",
""
],
[
"Blaes",
"Omer",
""
]
] |
0705.0306 | Andrew Haas | D0 Collaboration, V. Abazov, et al | Search for stopped gluinos from p-pbar collisions at sqrt(s)=1.96 TeV | Accepted to Phys. Rev. Lett | Phys.Rev.Lett.99:131801,2007 | 10.1103/PhysRevLett.99.131801 | FERMILAB-PUB-07-100-E | hep-ex | null | Long-lived, heavy particles are predicted in a number of models beyond the
standard model of particle physics. We present the first direct search for such
particles' decays, occurring up to 100 hours after their production and not
synchronized with an accelerator bunch crossing. We apply the analysis to the
gluino (~g), predicted in split supersymmetry, which after hadronization can
become charged and lose enough momentum through ionization to come to rest in
dense particle detectors. Approximately 410 pb^-1 of p-pbar collisions at 1.96
TeV collected with the D0 detector during Run II of the Fermilab Tevatron
collider are analyzed in search of such ``stopped gluinos'' decaying into a
gluon and a neutralino (~X_0), reconstructed as a jet and missing energy. No
excess is observed above background, and limits are placed on the (gluino cross
section) x (probability to stop) x BR(~g -> g ~X_0) as a function of the gluino
and ~X_0 masses, for gluino lifetimes from 30 $\mu$s -- 100 hours.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:02:06 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 21:28:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"D0 Collaboration",
"",
""
],
[
"Abazov",
"V.",
""
]
] |
0705.0307 | Yasunari Kurita | Yasunari Kurita, Hideki Ishihara | Mass and Free energy in Thermodynamics of Squashed Kaluza-Klein Black
Holes | 11 pages, discussion extended | Class.Quant.Grav.24:4525-4532,2007 | 10.1088/0264-9381/24/17/016 | OCU-PHYS-265, AP-GR-41 | hep-th gr-qc | null | The Abbott-Deser mass, the Hamiltonian and the Komar mass of the
5-dimensional Kaluza-Klein black hole with squashed horizons take different
values. Introducing a new couple of thermodynamic variables for the Komar mass,
we show that each mass can be interpreted as a thermodynamic potential with its
own natural variables, i.e. all masses are related to each other by the
Legendre transformations. It is found that the new variables and the
gravitational tension represent the squashing of the outer horizon.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:34:36 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 08:46:14 GMT"
},
{
"version": "v3",
"created": "Wed, 1 Aug 2007 04:18:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kurita",
"Yasunari",
""
],
[
"Ishihara",
"Hideki",
""
]
] |
0705.0308 | Alexander Smirnov D. | A.D. Smirnov | Mass limits for scalar and gauge leptoquarks from $ K_L^0 \to e^{\mp}
\mu^{\pm}, B^0 \to e^{\mp} \tau^{\pm} $ decays | 9 pages, 2 figures. To be published in Mod. Phys. Lett. A | Mod.Phys.Lett.A22:2353-2363,2007 | 10.1142/S0217732307024401 | YARU_HE_ 07/01 | hep-ph | null | The contributions of scalar and gauge leptoquarks into widths of $K^0_L \to
e^{\mp} \mu^{\pm}$, $B^0 \to e^{\mp} \tau^{\pm}$ decays are calculated in the
models with the vectorlike and chiral four color symmetry and with the Higgs
mechanism of the quark-lepton mass splitting. From the current data on $K^0_L$
and $B^0$ decays the mass limits for scalar and chiral leptoquarks and the
updated vector leptoquark mass limits are obtained. It is shown that unlike the
gauge leptoquarks the scalar leptoquark mass limits are weak, of order or below
their direct mass limits. The search for such scalar leptoquarks at LHC and the
further search for leptonic decays $ B^0 \to l^+_i l^-_j $ are of interest.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:23:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Smirnov",
"A. D.",
""
]
] |
0705.0309 | Sorin Codoban | F. Popescu, C. \c{S}en, E. Dagotto and A. Moreo | The Crossover from Impurity to Valence Band in Diluted Magnetic
Semiconductors: The Role of the Coulomb Attraction by Acceptor | 8 pages, 4 Postscript figures, RevTex4 | null | 10.1103/PhysRevB.76.085206 | null | cond-mat.mtrl-sci | null | The crossover between an impurity band (IB) and a valence band (VB) regime as
a function of the magnetic impurity concentration in models for diluted
magnetic semiconductors (DMS) is studied systematically by taking into
consideration the Coulomb attraction between the carriers and the magnetic
impurities. The density of states and the ferromagnetic transition temperature
of a Spin-Fermion model applied to DMS are evaluated using Dynamical Mean-Field
Theory (DMFT) and Monte Carlo (MC) calculations. It is shown that the addition
of a square-well-like attractive potential can generate an IB at small enough
Mn doping $x$ for values of the $p-d$ exchange $J$ that are not strong enough
to generate one by themselves. We observe that the IB merges with the VB when
$x >= x_c$ where $x_c$ is a function of $J$ and the Coulomb attraction strength
$V$. Using MC calculations, we demonstrate that the range of the Coulomb
attraction plays an important role. While the on-site attraction, that has been
used in previous numerical simulations, effectively renormalizes $J$ for all
values of $x$, an unphysical result, a nearest-neighbor range attraction
renormalizes $J$ only at very low dopings, i.e., until the bound holes wave
functions start to overlap. Thus, our results indicate that the Coulomb
attraction can be neglected to study Mn doped GaSb, GaAs, and GaP in the
relevant doping regimes, but it should be included in the case of Mn doped GaN
that is expected to be in the IB regime.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:29:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Popescu",
"F.",
""
],
[
"Şen",
"C.",
""
],
[
"Dagotto",
"E.",
""
],
[
"Moreo",
"A.",
""
]
] |
0705.0310 | Renaud Le Gac | E. Aslanides, J.-P. Cachemiche, J. Cogan, B. Dinkespiler, S. Favard,
P.-Y. Duval, R. Le Gac, O. Leroy, P.-L. Liotard, F. Marin, M. Menouni, A.
Roche, A. Tsaregorodtsev | The Level-0 Muon Trigger for the LHCb Experiment | 33 pages, 16 figures, submitted to NIM A | Nucl.Instrum.Meth.A579:989-1004,2007 | 10.1016/j.nima.2007.06.022 | null | physics.ins-det | null | A very compact architecture has been developed for the first level Muon
Trigger of the LHCb experiment that processes 40 millions of proton-proton
collisions per second. For each collision, it receives 3.2 kBytes of data and
it finds straight tracks within a 1.2 microseconds latency. The trigger
implementation is massively parallel, pipelined and fully synchronous with the
LHC clock. It relies on 248 high density Field Programable Gate arrays and on
the massive use of multigigabit serial link transceivers embedded inside FPGAs.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:36:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aslanides",
"E.",
""
],
[
"Cachemiche",
"J. -P.",
""
],
[
"Cogan",
"J.",
""
],
[
"Dinkespiler",
"B.",
""
],
[
"Favard",
"S.",
""
],
[
"Duval",
"P. -Y.",
""
],
[
"Gac",
"R. Le",
""
],
[
"Leroy",
"O.",
""
],
[
"Liotard",
"P. -L.",
""
],
[
"Marin",
"F.",
""
],
[
"Menouni",
"M.",
""
],
[
"Roche",
"A.",
""
],
[
"Tsaregorodtsev",
"A.",
""
]
] |
0705.0311 | Vadas Gintautas | Vadas Gintautas, Glenn Foster, and Alfred W. Hubler | Resonant forcing of select degrees of freedom of multidimensional
chaotic map dynamics | 11 pages, 3 figures | J. Stat. Phys. 130, 617, (2008) | 10.1007/s10955-007-9444-4 | null | physics.class-ph nlin.CD physics.gen-ph | null | We study resonances of multidimensional chaotic map dynamics. We use the
calculus of variations to determine the additive forcing function that induces
the largest response, that is, the greatest deviation from the unperturbed
dynamics. We include the additional constraint that only select degrees of
freedom be forced, corresponding to a very general class of problems in which
not all of the degrees of freedom in an experimental system are accessible to
forcing. We find that certain Lagrange multipliers take on a fundamental
physical role as the efficiency of the forcing function and the effective
forcing experienced by the degrees of freedom which are not forced directly.
Furthermore, we find that the product of the displacement of nearby
trajectories and the effective total forcing function is a conserved quantity.
We demonstrate the efficacy of this methodology with several examples.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 17:07:37 GMT"
}
] | 2008-07-31T00:00:00 | [
[
"Gintautas",
"Vadas",
""
],
[
"Foster",
"Glenn",
""
],
[
"Hubler",
"Alfred W.",
""
]
] |
0705.0312 | Antoine Browaeys | J. Beugnon, C. Tuchendler, H. Marion, A. Gaetan, Y. Miroshnychenko,
Y.R.P. Sortais, A.M. Lance, M.P.A. Jones, G. Messin, A. Browaeys, P. Grangier | Two-dimensional transport and transfer of a single atomic qubit in
optical tweezers | 4 pages, 4 figures | Nature Physics, vol. 3, p. 696 (2007) | 10.1038/nphys698 | null | quant-ph | null | Quantum computers have the capability of out-performing their classical
counterparts for certain computational problems. Several scalable quantum
computing architectures have been proposed. An attractive architecture is a
large set of physically independant qubits, arranged in three spatial regions
where (i) the initialized qubits are stored in a register, (ii) two qubits are
brought together to realize a gate, and (iii) the readout of the qubits is
performed. For a neutral atom-based architecture, a natural way to connect
these regions is to use optical tweezers to move qubits within the system. In
this letter we demonstrate the coherent transport of a qubit, encoded on an
atom trapped in a sub-micron tweezer, over a distance typical of the separation
between atoms in an array of optical traps. Furthermore, we transfer a qubit
between two tweezers, and show that this manipulation also preserves the
coherence of the qubit.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:55:24 GMT"
}
] | 2010-06-09T00:00:00 | [
[
"Beugnon",
"J.",
""
],
[
"Tuchendler",
"C.",
""
],
[
"Marion",
"H.",
""
],
[
"Gaetan",
"A.",
""
],
[
"Miroshnychenko",
"Y.",
""
],
[
"Sortais",
"Y. R. P.",
""
],
[
"Lance",
"A. M.",
""
],
[
"Jones",
"M. P. A.",
""
],
[
"Messin",
"G.",
""
],
[
"Browaeys",
"A.",
""
],
[
"Grangier",
"P.",
""
]
] |
0705.0313 | Gasper Tkacik | Gasper Tkacik, Curtis G Callan Jr, William Bialek | Information flow and optimization in transcriptional control | 5 pages, 4 figures | Proc Natl Acad Sci USA 105 (2008): 12265-12270 | 10.1073/pnas.0806077105 | null | q-bio.MN | null | In the simplest view of transcriptional regulation, the expression of a gene
is turned on or off by changes in the concentration of a transcription factor
(TF). We use recent data on noise levels in gene expression to show that it
should be possible to transmit much more than just one regulatory bit.
Realizing this optimal information capacity would require that the dynamic
range of TF concentrations used by the cell, the input/output relation of the
regulatory module, and the noise levels of binding and transcription satisfy
certain matching relations. This parameter-free prediction is in good agreement
with recent experiments on the Bicoid/Hunchback system in the early Drosophila
embryo, and this system achieves ~90% of its theoretical maximum information
transmission.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:44:44 GMT"
}
] | 2013-08-01T00:00:00 | [
[
"Tkacik",
"Gasper",
""
],
[
"Callan",
"Curtis G",
"Jr"
],
[
"Bialek",
"William",
""
]
] |
0705.0314 | Omer Blaes | Omer Blaes, Shigenobu Hirose, Julian H. Krolik | Surface Structure in an Accretion Disk Annulus with Comparable Radiation
and Gas Pressure | ApJ, in press | Astrophys.J.664:1057-1071,2007 | 10.1086/519516 | null | astro-ph | null | We have employed a 3-d energy-conserving radiation MHD code to simulate the
vertical structure and thermodynamics of a shearing box whose parameters were
chosen so that the radiation and gas pressures would be comparable. The upper
layers of this disk segment are magnetically-dominated, creating conditions
appropriate for both photon bubble and Parker instabilities. We find little
evidence for photon bubbles, even though the simulation has enough spatial
resolution to see them and their predicted growth rates are high. On the other
hand, there is strong evidence for Parker instabilities, and they appear to
dominate the evolution of the magnetically supported surface layers. The disk
photosphere is complex, with large density inhomogeneities at both the
scattering and effective (thermalization) photospheres of the evolving
horizontally-averaged structure. Both the dominant magnetic support and the
inhomogeneities are likely to have strong effects on the spectrum and
polarization of thermal photons emerging from the disk atmosphere. The
inhomogeneities are also large enough to affect models of reflection spectra
from the atmospheres of accretion disks.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:53:28 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Blaes",
"Omer",
""
],
[
"Hirose",
"Shigenobu",
""
],
[
"Krolik",
"Julian H.",
""
]
] |
0705.0315 | Omid Amini | Omid Amini, Frederic Havet, Florian Huc, Stephan Thomasse | WDM and Directed Star Arboricity | 18 pages, 2 figures. Final version | Combinatorics, Probability and Computing, Volume 19, Issue 02,
March 2010, pp 161-182 | null | null | cs.NI math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A digraph is $m$-labelled if every arc is labelled by an integer in $\{1,
\dots,m\}$. Motivated by wavelength assignment for multicasts in optical
networks, we introduce and study $n$-fibre colourings of labelled digraphs.
These are colourings of the arcs of $D$ such that at each vertex $v$, and for
each colour $\alpha$, $in(v,\alpha)+out(v,\alpha)\leq n$ with $in(v,\alpha)$
the number of arcs coloured $\alpha$ entering $v$ and $out(v,\alpha)$ the
number of labels $l$ such that there is at least one arc of label $l$ leaving
$v$ and coloured with $\alpha$. The problem is to find the minimum number of
colours $\lambda_n(D)$ such that the $m$-labelled digraph $D$ has an $n$-fibre
colouring. In the particular case when $D$ is $1$-labelled, $\lambda_1(D)$ is
called the directed star arboricity of $D$, and is denoted by $dst(D)$. We
first show that $dst(D)\leq 2\Delta^-(D)+1$, and conjecture that if
$\Delta^-(D)\geq 2$, then $dst(D)\leq 2\Delta^-(D)$. We also prove that for a
subcubic digraph $D$, then $dst(D)\leq 3$, and that if $\Delta^+(D),
\Delta^-(D)\leq 2$, then $dst(D)\leq 4$. Finally, we study
$\lambda_n(m,k)=\max\{\lambda_n(D) \tq D \mbox{is $m$-labelled} \et
\Delta^-(D)\leq k\}$. We show that if $m\geq n$, then $\ds
\left\lceil\frac{m}{n}\left\lceil \frac{k}{n}\right\rceil + \frac{k}{n}
\right\rceil\leq \lambda_n(m,k) \leq\left\lceil\frac{m}{n}\left\lceil
\frac{k}{n}\right\rceil + \frac{k}{n} \right\rceil + C \frac{m^2\log k}{n}$ for
some constant $C$. We conjecture that the lower bound should be the right value
of $\lambda_n(m,k)$.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:54:55 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 08:38:06 GMT"
},
{
"version": "v3",
"created": "Thu, 15 Jul 2010 01:05:23 GMT"
}
] | 2010-07-16T00:00:00 | [
[
"Amini",
"Omid",
""
],
[
"Havet",
"Frederic",
""
],
[
"Huc",
"Florian",
""
],
[
"Thomasse",
"Stephan",
""
]
] |
0705.0316 | David J Fernandez C | David J. Fernandez C, Veronique Hussin, Oscar Rosas-Ortiz | Coherent states for Hamiltonians generated by supersymmetry | LaTeX file, 26 pages, 3 eps figures | J. Phys A: Math. Teor. 40 (2007) 6491-6511 | 10.1088/1751-8113/40/24/015 | null | quant-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coherent states are derived for one-dimensional systems generated by
supersymmetry from an initial Hamiltonian with a purely discrete spectrum for
which the levels depend analytically on their subindex. It is shown that the
algebra of the initial system is inherited by its SUSY partners in the subspace
associated to the isospectral part or the spectrum. The technique is applied to
the harmonic oscillator, infinite well and trigonometric Poeschl-Teller
potentials.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:56:26 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2012 15:36:42 GMT"
}
] | 2023-04-13T00:00:00 | [
[
"C",
"David J. Fernandez",
""
],
[
"Hussin",
"Veronique",
""
],
[
"Rosas-Ortiz",
"Oscar",
""
]
] |
0705.0317 | Wellington G. Dantas | W.G. Dantas, M.J. de Oliveira and J.F. Stilck | Revisiting the one-dimensional diffusive contact process | null | null | 10.1088/1742-5468/2007/08/P08009 | null | cond-mat.stat-mech | null | In this work we study the one-dimensional contact process with diffusion
using two different approaches to research the critical properties of this
model: the supercritical series expansions and finite-size exact solutions.
With special emphasis we look to the multicritical point and its crossover
exponent that characterizes the passage between DP and mean-field critical
properties. This crossover occurs in the limit of infinite diffusion rate and
our results pointed $\phi=4$ as the better estimate for the crossover exponent
in agreement with computational simulations.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 15:56:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dantas",
"W. G.",
""
],
[
"de Oliveira",
"M. J.",
""
],
[
"Stilck",
"J. F.",
""
]
] |
0705.0318 | Yuan Xu | Pencho Petrushev and Yuan Xu | Decomposition of spaces of distributions induced by Hermite expansions | 34 pages | null | null | null | math.CA math.FA | null | Decomposition systems with rapidly decaying elements (needlets) based on
Hermite functions are introduced and explored. It is proved that the
Triebel-Lizorkin and Besov spaces on $\R^d$ induced by Hermite expansions can
be characterized in terms of the needlet coefficients. It is also shown that
the Hermite Triebel-Lizorkin and Besov spaces are, in general, different from
the respective classical spaces.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:02:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Petrushev",
"Pencho",
""
],
[
"Xu",
"Yuan",
""
]
] |
0705.0319 | Salvatore Capozziello | A. Capolupo, S. Capozziello, G. Vitiello | Dark energy, cosmological constant and neutrino mixing | 10 pages, 2 figures | Int.J.Mod.Phys.A23:4979-4990,2009 | 10.1142/S0217751X08042857 | null | hep-th gr-qc | null | The today estimated value of dark energy can be achieved by the vacuum
condensate induced by neutrino mixing phenomenon. Such a tiny value is
recovered for a cut-off of the order of Planck scale and it is linked to the
sub eV neutrino mass scale. Contributions to dark energy from auxiliary fields
or mechanisms are not necessary in this approach.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:06:21 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Capolupo",
"A.",
""
],
[
"Capozziello",
"S.",
""
],
[
"Vitiello",
"G.",
""
]
] |
0705.0320 | Vladimir Shiltsev | Vladimir Shiltsev, Yuri Alexahin, Vsevolod Kamerdzhiev, Gennady
Kuznetsov, Xiao-Long Zhang, Kip Bishofberger | Experimental Demonstration of Compensation of Beam-Beam Effects by
Electron Lenses | submitted to Physical Review Letters, April 2, 2007. submitted to
Physical Review Letters, April 2, 2007 | Phys. Rev. Lett. 99, 244801 (2007) | 10.1103/PhysRevLett.99.244801 | null | physics.acc-ph | null | We report the first experimental demonstration of compensation of beam-beam
interaction effects in high-energy particle collider by using space-charge
forces of a low-energy electron beam. In our experiments, an electron lens, a
novel instrument developed for the beam-beam compensation, was set on a 980-GeV
proton bunch in the Tevatron proton-antiproton collider. The proton bunch
losses due to its interaction with antiproton beam were reduced by a factor of
2 when the electron lens was operating. We describe the principle of electron
lens operation and present experimental results.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:07:13 GMT"
}
] | 2015-06-17T00:00:00 | [
[
"Shiltsev",
"Vladimir",
""
],
[
"Alexahin",
"Yuri",
""
],
[
"Kamerdzhiev",
"Vsevolod",
""
],
[
"Kuznetsov",
"Gennady",
""
],
[
"Zhang",
"Xiao-Long",
""
],
[
"Bishofberger",
"Kip",
""
]
] |
0705.0321 | Niklas Beisert | N. Beisert, T. McLoughlin, R. Roiban | The Four-Loop Dressing Phase of N=4 SYM | 19 pages, v2: referenced added | Phys.Rev.D76:046002,2007 | 10.1103/PhysRevD.76.046002 | AEI-2007-026, PUTP-2233 | hep-th | null | We compute the dilatation generator in the su(2) sector of planar N=4 super
Yang-Mills theory at four-loops. We use the known world-sheet scattering matrix
to constrain the structure of the generator. The remaining few coefficients can
be computed directly from Feynman diagrams. This allows us to confirm previous
conjectures for the leading contribution to the dressing phase which is
proportional to zeta(3).
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:18:47 GMT"
},
{
"version": "v2",
"created": "Fri, 18 May 2007 19:37:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Beisert",
"N.",
""
],
[
"McLoughlin",
"T.",
""
],
[
"Roiban",
"R.",
""
]
] |
0705.0322 | Jacob Dunningham | Jacob Dunningham and Vlatko Vedral | Nonlocality of a single particle | 4 pages, 3 figures | null | 10.1103/PhysRevLett.99.180404 | null | quant-ph | null | There has been a great deal of debate surrounding the issue of whether it is
possible for a single photon to exhibit nonlocality. A number of schemes have
been proposed that claim to demonstrate this effect, but each has been met with
significant opposition. The objections hinge largely on the fact that these
schemes use unobservable initial states and so, it is claimed, they do not
represent experiments that could actually be performed. Here we show how it is
possible to overcome these objections by presenting an experimentally feasible
scheme that uses realistic initial states. Furthermore, all the techniques
required for photons are equally applicable to atoms. It should, therefore,
also be possible to use this scheme to verify the nonlocality of a single
massive particle.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:22:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dunningham",
"Jacob",
""
],
[
"Vedral",
"Vlatko",
""
]
] |
0705.0323 | Thomas Speck | V. Blickle, T. Speck, U. Seifert, C. Bechinger | Characterizing Potentials by a Generalized Boltzmann Factor | null | Phys. Rev. E 75, 060101 (2007) | 10.1103/PhysRevE.75.060101 | null | cond-mat.soft cond-mat.stat-mech | null | Based on the concept of a nonequilibrium steady state, we present a novel
method to experimentally determine energy landscapes acting on colloidal
systems. By measuring the stationary probability distribution and the current
in the system, we explore potential landscapes with barriers up to several
hundred $\kT$. As an illustration, we use this approach to measure the
effective diffusion coefficient of a colloidal particle moving in a tilted
potential.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:23:49 GMT"
}
] | 2007-06-20T00:00:00 | [
[
"Blickle",
"V.",
""
],
[
"Speck",
"T.",
""
],
[
"Seifert",
"U.",
""
],
[
"Bechinger",
"C.",
""
]
] |
0705.0324 | Thomas Speck | T. Speck, V. Blickle, C. Bechinger, U. Seifert | Distribution of Entropy Production for a Colloidal Particle in a
Nonequilibrium Steady State | null | Europhys. Lett. 79, 30002 (2007) | 10.1209/0295-5075/79/30002 | null | cond-mat.stat-mech | null | For a colloidal particle driven by a constant force across a periodic
potential, we investigate the distribution of entropy production both
experimentally and theoretically. For short trajectories, the fluctuation
theorem holds experimentally. The mean entropy production rate shows two
regimes as a function of the applied force. Theoretically, both mean and
variance of the pronounced non-Gaussian distribution can be obtained from a
differential equation in good agreement with the experimental data.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:29:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Speck",
"T.",
""
],
[
"Blickle",
"V.",
""
],
[
"Bechinger",
"C.",
""
],
[
"Seifert",
"U.",
""
]
] |
0705.0325 | Nikolaos Fountoulakis | N. Fountoulakis, D. K\"uhn, D. Osthus | The order of the largest complete minor in a random graph | 14 pages | null | null | null | math.CO math.PR | null | Let ccl(G) denote the order of the largest complete minor in a graph G (also
called the contraction clique number) and let G(n,p) denote a random graph on n
vertices with edge probability p. Bollobas, Catlin and Erdos asymptotically
determined ccl(G (n,p)) when p is a constant. Luczak, Pittel and Wierman gave
bounds on ccl(G(n,p)) when p is very close to 1/n, i.e. inside the phase
transition. Extending the results of Bollobas, Catlin and Erdos, we determine
ccl(G(n,p)) quite tightly, for p>C/n where C is a large constant. If p=C/n, for
an arbitrary constant C>1, then we show that asymptotically almost surely ccl(G
(n,p)) is of order square-root of n. This answers a question of Krivelevich and
Sudakov.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:35:45 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Fountoulakis",
"N.",
""
],
[
"Kühn",
"D.",
""
],
[
"Osthus",
"D.",
""
]
] |
0705.0326 | Lei Ying | Lei Ying and R. Srikant | Optimal Delay-Throughput Trade-offs in Mobile Ad-Hoc Networks: Hybrid
Random Walk and One-Dimensional Mobility Models | 13 pages | null | null | null | cs.NI cs.IT math.IT | null | Optimal delay-throughput trade-offs for two-dimensional i.i.d mobility models
have been established in [23], where we showed that the optimal trade-offs can
be achieved using rate-less codes when the required delay guarantees are
sufficient large. In this paper, we extend the results to other mobility models
including two-dimensional hybrid random walk model, one-dimensional i.i.d.
mobility model and one-dimensional hybrid random walk model. We consider both
fast mobiles and slow mobiles, and establish the optimal delay-throughput
trade-offs under some conditions. Joint coding-scheduling algorithms are also
proposed to achieve the optimal trade-offs.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:43:30 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Ying",
"Lei",
""
],
[
"Srikant",
"R.",
""
]
] |
0705.0327 | Ernest Ma | Ernest Ma (UC Riverside) | Non-Abelian Discrete Flavor Symmetries | 12pages, no figure, one correction | null | null | UCRHEP-T31 (June 2007) | hep-ph | null | This is an incomplete survey of some non-Abelian discrete symmetries which
have been used recently in attempts to understand the flavor structure of
leptons and quarks. To support such symmetries, new scalar particles are
required. In some models, they are very massive, in which case there may not be
much of a trace of their existence at the TeV scale. In other models, they are
themselves at the TeV scale, in which case there is a reasonable chance for
them to be revealed at the LHC (Large Hadron Collider) at CERN.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:47:03 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 17:52:42 GMT"
},
{
"version": "v3",
"created": "Tue, 19 Jun 2007 16:00:38 GMT"
},
{
"version": "v4",
"created": "Thu, 26 Jul 2007 19:07:14 GMT"
}
] | 2007-07-26T00:00:00 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
0705.0328 | Charles J. Lada | E.D. Aguti, C.J. Lada, E.A. Bergin, J.F. Alves, M. Birkinshaw | The Dynamical State fo the Starless Dense Core FeSt 1-457: A Pulsating
Globule? | to appear in ApJ vol 665 20 August 2007; | Astrophys.J.665:457-465,2007 | 10.1086/519272 | null | astro-ph | null | High resolution molecular line observations of CS, HCO+, C18O and N2H+ were
obtained toward the starless globule FeSt 1-457 in order to investigate its
kinematics and chemistry. The HCO+ and CS spectra show clear self-reversed and
asymmetric profiles across the face of the globule. The sense of the observed
asymmetry is indicative of the global presence of expansion motions in the
outer layers of the globule. These motions appear to be subsonic and
significantly below the escape velocity of the globule. Comparison of our
observations with near-infrared extinction data indicate that the globule is
gravitationally bound. Taken together these considerations lead us to suggest
that the observed expansion has its origin in an oscillatory motion of the
outer layers of the globule which itself is likely in a quasi-stable state near
hydrostatic equilibrium. Analysis of the observed linewidths of CO and N2H+
confirm that thermal pressure is the dominant component of the cloud's internal
support. A simple calculation suggests that the dominant mode of pulsation
would be an l = 2 mode with a period of 0.3 Myr. Deformation of the globule due
to the large amplitude l = 2 oscillation may be responsible for the
double-peaked structure of the core detected in high resolution extinction
maps. Detailed comparison of the molecular-line observations and extinction
data provides evidence for significant depletion of C18O and perhaps HCO+ while
N2H+ may be undepleted to a cloud depth of about 40 magnitudes of visual
extinction.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:50:30 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Aguti",
"E. D.",
""
],
[
"Lada",
"C. J.",
""
],
[
"Bergin",
"E. A.",
""
],
[
"Alves",
"J. F.",
""
],
[
"Birkinshaw",
"M.",
""
]
] |
0705.0329 | Claudia Simolo | M. Baldicchi, A. V. Nesterenko, G. M. Prosperi, D. V. Shirkov and C.
Simolo | Bound state approach to the QCD coupling at low energy scales | Revised version, to appear on Physical Review Letters. 7 pages, 2
figures, Revtex | Phys.Rev.Lett.99:242001,2007 | 10.1103/PhysRevLett.99.242001 | null | hep-ph | null | We exploit theoretical results on the meson spectrum within the framework of
a Bethe-Salpeter (BS) formalism adjusted for QCD, in order to extract an
``experimental'' coupling \alpha_s^{exp}(Q^2) below 1 GeV by comparison with
the data. Our results for \alpha_s^{exp}(Q^2) exhibit a good agreement with the
infrared safe Analytic Perturbation Theory (APT) coupling from 1 GeV down to
200 MeV. As a main result, we claim that the combined BS-APT theoretical scheme
provides us with a rather satisfactory correlated understanding of very high
and low energy phenomena.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 16:55:46 GMT"
},
{
"version": "v2",
"created": "Thu, 22 Nov 2007 13:24:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Baldicchi",
"M.",
""
],
[
"Nesterenko",
"A. V.",
""
],
[
"Prosperi",
"G. M.",
""
],
[
"Shirkov",
"D. V.",
""
],
[
"Simolo",
"C.",
""
]
] |
0705.0330 | Charles J. Lada | E.D. Aguti, C.J. Lada, E.A. Bergin, J.F. Alves, M. Birkinshaw | The Dynamical State of the Starless Dense Core FeSt 1-457: A Pulsating
Globule? | to appear in ApJ vol 665 20 August 2007; | null | 10.1086/519272 | null | astro-ph | null | High resolution molecular line observations of CS, HCO+, C18O and N2H+ were
obtained toward the starless globule FeSt 1-457 in order to investigate its
kinematics and chemistry. The HCO+ and CS spectra show clear self-reversed and
asymmetric profiles across the face of the globule. The sense of the observed
asymmetry is indicative of the global presence of expansion motions in the
outer layers of the globule. These motions appear to be subsonic and
significantly below the escape velocity of the globule. Comparison of our
observations with near-infrared extinction data indicate that the globule is
gravitationally bound. Taken together these considerations lead us to suggest
that the observed expansion has its origin in an oscillatory motion of the
outer layers of the globule which itself is likely in a quasi-stable state near
hydrostatic equilibrium. Analysis of the observed linewidths of CO and N2H+
confirm that thermal pressure is the dominant component of the cloud's internal
support. A simple calculation suggests that the dominant mode of pulsation
would be an l = 2 mode with a period of 0.3 Myr. Deformation of the globule due
to the large amplitude l = 2 oscillation may be responsible for the
double-peaked structure of the core detected in high resolution extinction
maps. Detailed comparison of the molecular-line observations and extinction
data provides evidence for significant depletion of C18O and perhaps HCO+ while
N2H+ may be undepleted to a cloud depth of about 40 magnitudes of visual
extinction.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 17:03:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aguti",
"E. D.",
""
],
[
"Lada",
"C. J.",
""
],
[
"Bergin",
"E. A.",
""
],
[
"Alves",
"J. F.",
""
],
[
"Birkinshaw",
"M.",
""
]
] |
0705.0331 | Jose Ricardo Marinelli | P. Alberto, S. S. Avancini, M. Fiolhais and J. R. Marinelli | Center-of-Mass Correction in a Relativistic Hartree Approximation
Including the Meson Degrees of Freedom | 19 pages, accepted for publication in Phys. Rev. C | Phys.Rev.C75:054324,2007 | 10.1103/PhysRevC.75.054324 | null | nucl-th | null | The Peierls-Yoccoz projection method is used to study the motion of a
relativistic system of nucleons interacting with sigma and omega mesons. The
nuclear system is described in a mean-field Hartree approach, including
explicitly the meson contribution and the formalism is applied to some selected
N=Z spherical nuclei. The center-of-mass motion correction makes the system too
much bounded, but we show that an appropriate refitting of the model brings the
radii and binding energies close to the experimental values.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 17:04:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Alberto",
"P.",
""
],
[
"Avancini",
"S. S.",
""
],
[
"Fiolhais",
"M.",
""
],
[
"Marinelli",
"J. R.",
""
]
] |
0705.0332 | Yun Wang | Laura Mersini-Houghton, Yun Wang, Pia Mukherjee, and Ervin Kafexhiu | Nontrivial Geometries: Bounds on the Curvature of the Universe | 7 pages, 8 figures. Submitted | Astropart.Phys.29:167-173,2008 | 10.1016/j.astropartphys.2007.12.006 | null | astro-ph gr-qc hep-ph hep-th | null | Probing the geometry of the universe is one of the most important endevours
in cosmology. Current observational data from the Cosmic Microwave Background
anisotropy (CMB), galaxy surveys and type Ia supernovae (SNe Ia) strongly
constrain the curvature of the universe to be close to zero for a universe
dominated by a cosmological constant or dark energy with a constant equation of
state. Here we investigate the role of cosmic priors on deriving these tight
bounds on geometry, by considering a landscape motivated scenario with an
oscillating curvature term. We perform a likelihood analysis of current data
under such a model of non-trivial geometry and find that the uncertainties on
curvature, and correspondingly on parameters of the matter and dark energy
sectors, are larger. Future dark energy experiments together with CMB data from
experiments like Planck could dramatically improve our ability to constrain
cosmic curvature under such models enabling us to probe possible imprints of
quantum gravity.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 17:16:46 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Mersini-Houghton",
"Laura",
""
],
[
"Wang",
"Yun",
""
],
[
"Mukherjee",
"Pia",
""
],
[
"Kafexhiu",
"Ervin",
""
]
] |
0705.0333 | Luk\'a\v{s} Vok\v{r}\'inek | Luk\'a\v{s} Vok\v{r}\'inek | A generalization of Vassiliev's h-principle | 91 pages; PhD thesis, University of Aberdeen, 2006 | null | null | null | math.AT math.DG | null | This thesis consists of two parts which share only a slight overlap.
The first part is concerned with the study of ideals in the ring
$C^\infty(M,R)$ of smooth functions on a compact smooth manifold M or more
generally submodules of a finitely generated $C^\infty(M,R)$-module V. We
define a topology on the space of all submodules of V of a fixed finite
codimension d. Its main property is that it is compact Hausdorff and, in the
case of ideals in the ring itself, it contains as a subspace the configuration
space of d distinct unordered points in M and therefore gives a
"compactification" of this configuration space. We present a concrete
description of this space for low codimensions.
The main focus is then put on the second part which is concerned with a
generalization of Vassiliev's h-principle. This principle in its simplest form
asserts that the jet prolongation map $j^r:C^\infty(M,E)\to\Gamma(J^r(M,E))$,
defined on the space of smooth maps from a compact manifold M to a Euclidean
space E and with target the space of smooth sections of the jet bundle
$J^r(M,E)$, is a cohomology isomorphism when restricted to certain
"nonsingular" subsets (these are defined in terms of a certain subset
$R\subseteq J^r(M,E)$). Our generalization then puts this theorem in a more
general setting of topological $C^\infty(M,R)$-modules. As a reward we get a
strengthening of this result asserting that all the homotopy fibres have zero
homology.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:02:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Vokřínek",
"Lukáš",
""
]
] |
0705.0334 | Daniel Daigle | Daniel Daigle | Affine surfaces with trivial Makar-Limanov invariant | 12 pages. See also http://aix1.uottawa.ca/~ddaigle/index.html | null | null | null | math.AG math.AC | null | We study the class of 2-dimensional affine k-domains R satisfying ML(R) = k,
where k is an arbitrary field of characteristic zero. In particular, we obtain
the following result:
Let R be a localization of a polynomial ring in finitely many variables over
a field of characteristic zero. If ML(R) = K for some field K included in R and
such that R has transcendence degree 2 over K, then R is K-isomorphic to
K[X,Y,Z]/(XY-P(Z)) for some nonconstant polynomial P(Z) in K[Z].
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 17:29:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Daigle",
"Daniel",
""
]
] |
0705.0335 | Miguel Pruneda J. | J. M. Pruneda, V. Ferrari, P. B. Littlewood, N. A. Spaldin, E. Artacho | Ferrodistortive instability at the (001) surface of half-metallic
manganites | 4 pages, 2 figures | null | 10.1103/PhysRevLett.99.226101 | null | cond-mat.mtrl-sci | null | We present the structure of the fully relaxed (001) surface of the
half-metallic manganite La0.7Sr0.3MnO3, calculated using density functional
theory within the generalized gradient approximation (GGA). Two relevant
ferroelastic order parameters are identified and characterized: The tilting of
the oxygen octahedra, which is present in the bulk phase, oscillates and
decreases towards the surface, and an additional ferrodistortive Mn
off-centering, triggered by the surface, decays monotonically into the bulk.
The narrow d-like energy band that is characteristic of unrelaxed manganite
surfaces is shifted down in energy by these structural distortions, retaining
its uppermost layer localization. The magnitude of the zero-temperature
magnetization is unchanged from its bulk value, but the effective spin-spin
interactions are reduced at the surface.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:07:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pruneda",
"J. M.",
""
],
[
"Ferrari",
"V.",
""
],
[
"Littlewood",
"P. B.",
""
],
[
"Spaldin",
"N. A.",
""
],
[
"Artacho",
"E.",
""
]
] |
0705.0336 | Lambert Alff | Y. Krockenberger (1,2), K. Mogare (2), M. Reehuis (2,3), M. Tovar (3),
M. Jansen (2), G. Vaitheeswaran (2,4), V. Kanchana (2,4), F. Bultmark (5), A.
Delin (4), F. Wilhelm (6), A. Rogalev (6), A. Winkler (1), and L. Alff (1)
((1) Institute of Materials Science, TU Darmstadt, (2) MPI for Solid State
Research, Stuttgart, (3) HMI Berlin, (4) KTH Stockholm, (5) University of
Uppsala, (6) ESRF Grenoble) | Sr2CrOsO6: Endpoint of a spin polarized metal-insulator transition by 5d
band filling | including corrected table 1 | Phys. Rev. B 75, 020404(R) (2007) | 10.1103/PhysRevB.75.179901 | null | cond-mat.str-el cond-mat.mtrl-sci | null | In the search for new spintronic materials with high spin-polarization at
room-temperature, we have synthesized an osmium based double perovskite with a
Curie-temperature of 725 K. Our combined experimental results confirm the
existence of a sizable induced magnetic moment at the Os site, supported by
band-structure calculations in agreement with a proposed kinetic energy driven
mechanism of ferrimagnetism in these compounds. The intriguing property of
Sr2CrOsO6 is that it is at the endpoint of a metal-insulator transition due to
5d band filling, and at the same time ferrimagnetism and high-spin polarization
is preserved.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 17:51:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Krockenberger",
"Y.",
""
],
[
"Mogare",
"K.",
""
],
[
"Reehuis",
"M.",
""
],
[
"Tovar",
"M.",
""
],
[
"Jansen",
"M.",
""
],
[
"Vaitheeswaran",
"G.",
""
],
[
"Kanchana",
"V.",
""
],
[
"Bultmark",
"F.",
""
],
[
"Delin",
"A.",
""
],
[
"Wilhelm",
"F.",
""
],
[
"Rogalev",
"A.",
""
],
[
"Winkler",
"A.",
""
],
[
"Alff",
"L.",
""
]
] |
0705.0337 | Pablo Echenique | Pablo Echenique and J. L. Alonso | A mathematical and computational review of Hartree-Fock SCF methods in
Quantum Chemistry | 64 pages, 3 figures, tMPH2e.cls style file, doublesp, mathbbol and
subeqn packages | Molecular Physics 105 (2007) 3057-3098 | 10.1080/00268970701757875 | null | physics.chem-ph cond-mat.other physics.comp-ph | null | We present here a review of the fundamental topics of Hartree-Fock theory in
Quantum Chemistry. From the molecular Hamiltonian, using and discussing the
Born-Oppenheimer approximation, we arrive to the Hartree and Hartree-Fock
equations for the electronic problem. Special emphasis is placed in the most
relevant mathematical aspects of the theoretical derivation of the final
equations, as well as in the results regarding the existence and uniqueness of
their solutions. All Hartree-Fock versions with different spin restrictions are
systematically extracted from the general case, thus providing a unifying
framework. Then, the discretization of the one-electron orbitals space is
reviewed and the Roothaan-Hall formalism introduced. This leads to a exposition
of the basic underlying concepts related to the construction and selection of
Gaussian basis sets, focusing in algorithmic efficiency issues. Finally, we
close the review with a section in which the most relevant modern developments
(specially those related to the design of linear-scaling methods) are commented
and linked to the issues discussed. The whole work is intentionally
introductory and rather self-contained, so that it may be useful for non
experts that aim to use quantum chemical methods in interdisciplinary
applications. Moreover, much material that is found scattered in the literature
has been put together here to facilitate comprehension and to serve as a handy
reference.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:00:29 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 11:22:04 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Dec 2007 12:41:57 GMT"
}
] | 2008-11-25T00:00:00 | [
[
"Echenique",
"Pablo",
""
],
[
"Alonso",
"J. L.",
""
]
] |
0705.0338 | David Damanik | David Damanik (Rice), Mark Embree (Rice), Anton Gorodetski (Caltech),
and Serguei Tcheremchantsev (Universite d'Orleans) | The Fractal Dimension of the Spectrum of the Fibonacci Hamiltonian | 23 pages | Commun. Math. Phys. 280 (2008), 499-516 | 10.1007/s00220-008-0451-3 | null | math-ph math.MP math.SP | null | We study the spectrum of the Fibonacci Hamiltonian and prove upper and lower
bounds for its fractal dimension in the large coupling regime. These bounds
show that as $\lambda \to \infty$, $\dim (\sigma(H_\lambda)) \cdot \log
\lambda$ converges to an explicit constant ($\approx 0.88137$). We also discuss
consequences of these results for the rate of propagation of a wavepacket that
evolves according to Schr\"odinger dynamics generated by the Fibonacci
Hamiltonian.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:02:36 GMT"
}
] | 2014-12-30T00:00:00 | [
[
"Damanik",
"David",
"",
"Rice"
],
[
"Embree",
"Mark",
"",
"Rice"
],
[
"Gorodetski",
"Anton",
"",
"Caltech"
],
[
"Tcheremchantsev",
"Serguei",
"",
"Universite d'Orleans"
]
] |
0705.0339 | George Parzen | George Parzen | Theory of the friction force using electron cooling as an intrabeam
scattering process | 12 pages | null | null | C-A/AP/#261, November 2006 | physics.acc-ph | null | Using the results found previously for the cooling rates of the emittances,
due to collisions between the electrons and the ions, a result is found for the
friction force acting on the ions. It is shown that the friction force found
here when used to track the ion bunch will give the same emittance cooling
rates as those found using the intrabeam scattering theory for electron cooling
>.For the case of the uniform in space electron bunch distribution, the
friction force found here agrees with the friction force result found with the
usual theory of electron cooling.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:05:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Parzen",
"George",
""
]
] |
0705.0340 | Alexei Yu. Karlovich | Alexei Yu. Karlovich, Lech Maligranda | On the interpolation constant for subadditive operators in Orlicz spaces | null | null | null | null | math.FA math.CA | null | Let $1\le p<q\le\infty$ and let $T$ be a subadditive operator acting on
$L^p$ and $L^q$. We prove that $T$ is bounded on the Orlicz space
$L^\phi$, where $\phi^{-1}(u)=u^{1/p}\rho(u^{1/q-1/p})$ for some concave
function $\rho$ and \[ \|T\|_{L^\phi\to L^\phi}\le C\max\{\|T\|_{L^p\to
L^p},\|T\|_{L^q\to L^q}\}. \] The interpolation constant $C$, in general, is
less than 4 and, in many cases, we can give much better estimates for $C$. In
particular, if $p=1$ and $q=\infty$, then the classical Orlicz interpolation
theorem holds for subadditive operators with the interpolation constant C=1.
These results generalize our results for linear operators obtained in
\cite{KM01}.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:25:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Karlovich",
"Alexei Yu.",
""
],
[
"Maligranda",
"Lech",
""
]
] |
0705.0341 | Kristofer Coward | Kristofer T. Coward, George A. Elliott, Cristian Ivanescu | The Cuntz semigroup as an invariant for C*-algebras | 42 pages, submitted to J. Reine Agnew. Math | null | null | null | math.OA | null | A category is described to which the Cuntz semigroup belongs and as a functor
into which it preserves inductive limits.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:27:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Coward",
"Kristofer T.",
""
],
[
"Elliott",
"George A.",
""
],
[
"Ivanescu",
"Cristian",
""
]
] |
0705.0342 | Steven R. Blusk | S. R. Blusk | Y(5S): What has been learned and what can be learned | Proceedings of The 11th Conference on B Physics at Hadron Machines
(Beauty 2006), September 25-29, 2006, Keble College, Oxford. To appear in
Nucl. Phys. (Proc. Suppl.) 5 pages, 4 figures | null | 10.1016/j.nuclphysbps.2007.05.048 | null | hep-ex | null | We present recent measurements of B and B^0_s production using data collected
on the Y(5S) resonance at CLEO and Belle. We also briefly discuss what can be
learned using sufficiently larger data samples in the future.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:33:30 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Blusk",
"S. R.",
""
]
] |
0705.0343 | Emiliano Sefusatti | Emiliano Sefusatti, Eiichiro Komatsu | The bispectrum of galaxies from high-redshift galaxy surveys: primordial
non-Gaussianity and non-linear galaxy bias | 16 pages, 8 figures | Phys.Rev.D76:083004,2007 | 10.1103/PhysRevD.76.083004 | FERMILAB-PUB-07-107-A | astro-ph | null | The greatest challenge in the interpretation of galaxy clustering data from
any surveys is galaxy bias. Using a simple Fisher matrix analysis, we show that
the bispectrum provides an excellent determination of linear and non-linear
bias parameters of intermediate and high-z galaxies, when all measurable
triangle configurations down to mildly non-linear scales, where perturbation
theory is still valid, are included. The bispectrum is also a powerful probe of
primordial non-Gaussianity. The planned galaxy surveys at z>2 should yield
constraints on non-Gaussian parameters, f_{NL}^{loc.} and f_{NL}^{eq.}, that
are comparable to, or even better than, those from CMB experiments. We study
how these constraints improve with volume, redshift range, as well as the
number density of galaxies. Finally, we show that a halo occupation
distribution may be used to improve these constraints further by lifting
degeneracies between gravity, bias, and primordial non-Gaussianity.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:02:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sefusatti",
"Emiliano",
""
],
[
"Komatsu",
"Eiichiro",
""
]
] |
0705.0344 | Jonathan Pridham | J. P. Pridham | Unifying derived deformation theories | 55 pages; v4 split in two - other half is now arXiv:0908.1963; v5
final version, to appear in Adv. Math; v6 incorporates contents of a
subsequent corrigendum concerning geometric weak equivalences; v7 corrects an
error in Lemma 4.44 found by Andrey Lazarev | Adv. Math. 224 (2010), no.3, 772-826 | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a framework for derived deformation theory, valid in all
characteristics. This gives a model category reconciling local and global
approaches to derived moduli theory. In characteristic 0, we use this to show
that the homotopy categories of DGLAs and SHLAs (L infinity algebras)
considered by Kontsevich, Hinich and Manetti are equivalent, and are compatible
with the derived stacks of Toen--Vezzosi and Lurie. Another application is that
the cohomology groups associated to any classical deformation problem (in any
characteristic) admit the same operations as Andre--Quillen cohomology.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:51:37 GMT"
},
{
"version": "v2",
"created": "Sun, 1 Jul 2007 11:18:24 GMT"
},
{
"version": "v3",
"created": "Tue, 20 May 2008 18:03:01 GMT"
},
{
"version": "v4",
"created": "Thu, 13 Aug 2009 19:50:09 GMT"
},
{
"version": "v5",
"created": "Thu, 10 Dec 2009 18:42:22 GMT"
},
{
"version": "v6",
"created": "Fri, 29 Apr 2011 11:39:34 GMT"
},
{
"version": "v7",
"created": "Thu, 5 Sep 2019 21:11:49 GMT"
}
] | 2019-09-09T00:00:00 | [
[
"Pridham",
"J. P.",
""
]
] |
0705.0345 | Samoil Bilenky M. | S. M. Bilenky, F. von Feilitzsch and W. Potzel | Recoilless resonant neutrino experiment and origin of neutrino
oscillations | The report at the Workshop on Next Generation Nucleon Decay and
Neutrino Detectors, NNN06, September 21-23, 2006, University of Washington,
Seattle, USA | AIPConf.Proc.944:119-129,2007 | 10.1063/1.2818539 | null | hep-ph | null | We demonstrate that an experiment with recoilless resonant emission and
absorption of tritium antineutrinos could have an important impact on our
understanding of the origin of neutrino oscillations.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:12:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bilenky",
"S. M.",
""
],
[
"von Feilitzsch",
"F.",
""
],
[
"Potzel",
"W.",
""
]
] |
0705.0346 | Gerald Teschl | Spyridon Kamvissis and Gerald Teschl | Stability of the periodic Toda lattice under short range perturbations | 38 pages, 1 figure. This version combines both the original version
and arXiv:0805.3847 | J. Math. Phys. 53, 073706 (2012) | 10.1063/1.4731768 | null | nlin.SI math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the stability of the periodic Toda lattice (and slightly more
generally of the algebro-geometric finite-gap lattice) under a short range
perturbation. We prove that the perturbed lattice asymptotically approaches a
modulated lattice.
More precisely, let $g$ be the genus of the hyperelliptic curve associated
with the unperturbed solution. We show that, apart from the phenomenon of the
solitons travelling on the quasi-periodic background, the $n/t$-pane contains
$g+2$ areas where the perturbed solution is close to a finite-gap solution in
the same isospectral torus. In between there are $g+1$ regions where the
perturbed solution is asymptotically close to a modulated lattice which
undergoes a continuous phase transition (in the Jacobian variety) and which
interpolates between these isospectral solutions. In the special case of the
free lattice ($g=0$) the isospectral torus consists of just one point and we
recover the known result.
Both the solutions in the isospectral torus and the phase transition are
explicitly characterized in terms of Abelian integrals on the underlying
hyperelliptic curve.
Our method relies on the equivalence of the inverse spectral problem to a
matrix Riemann--Hilbert problem defined on the hyperelliptic curve and
generalizes the so-called nonlinear stationary phase/steepest descent method
for Riemann--Hilbert problem deformations to Riemann surfaces.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 18:57:00 GMT"
},
{
"version": "v2",
"created": "Thu, 29 May 2008 12:45:36 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Nov 2008 22:48:28 GMT"
},
{
"version": "v4",
"created": "Tue, 19 Jan 2010 09:40:09 GMT"
},
{
"version": "v5",
"created": "Tue, 25 May 2010 10:56:17 GMT"
},
{
"version": "v6",
"created": "Sat, 8 Dec 2012 20:15:53 GMT"
}
] | 2015-03-13T00:00:00 | [
[
"Kamvissis",
"Spyridon",
""
],
[
"Teschl",
"Gerald",
""
]
] |
0705.0347 | Robert Cherng | R. W. Cherng, Gil Refael, Eugene Demler | Superfluidity and magnetism in multicomponent ultracold fermions | 4 pages, 3 figures | Phys. Rev. Lett. 99, 130406 (2007) | 10.1103/PhysRevLett.99.130406 | null | cond-mat.supr-con cond-mat.str-el | null | We study the interplay between superfluidity and magnetism in a
multicomponent gas of ultracold fermions. Ward-Takahashi identities constrain
possible mean-field states describing order parameters for both pairing and
magnetization. The structure of global phase diagrams arises from competition
among these states as functions of anisotropies in chemical potential, density,
or interactions. They exhibit first and second order phase transition as well
as multicritical points, metastability regions, and phase separation. We
comment on experimental signatures in ultracold atoms.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:23:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cherng",
"R. W.",
""
],
[
"Refael",
"Gil",
""
],
[
"Demler",
"Eugene",
""
]
] |
0705.0348 | R. de la Madrid | R. de la Madrid | Reply to Comment arXiv:0704.3529v1 | 6-page reply to Comment arXiv:0704.3529v1. Such Comment was submitted
to J. Phys. A, but it won't be published. To avoid open-ended discussions,
the present author will not reply to more comments on this issue, unless they
are accepted by a peer-reviewed journal | null | null | null | quant-ph math-ph math.MP | null | In this reply, we show that the author of the Comment arXiv:0704.3529v1
inadvertently provides additional arguments against the use of Hardy functions
as test functions for the Gamow states.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:48:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"de la Madrid",
"R.",
""
]
] |
0705.0349 | Oleg Tarasov B. | O. B. Tarasov, T. Baumann, A. M. Amthor, D. Bazin, C. M. Folden III,
A. Gade, T. N. Ginter, M. Hausmann, M. Matos, D. J. Morrissey, A. Nettleton,
M. Portillo, A. Schiller, B. M. Sherrill, A. Stolz, and M. Thoennessen | New isotope 44Si and systematics of the production cross sections of the
most neutron-rich nuclei | 12 pages, 4 figures, 1 table; corrected figures 1, 3 & 4, corrected
typos, updated bibliography | Phys.Rev.C75:064613,2007 | 10.1103/PhysRevC.75.064613 | null | nucl-ex | null | The results of measurements of the production of neutron-rich nuclei by the
fragmentation of a 48Ca beam at 142 MeV/u are presented. Evidence was found for
the production of a new isotope that is the most neutron-rich silicon nuclide,
44Si, in a net neutron pick-up process. A simple systematic framework was found
to describe the production cross sections based on thermal evaporation from
excited prefragments that allows extrapolation to other weak reaction products.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:31:23 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Jun 2007 21:01:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tarasov",
"O. B.",
""
],
[
"Baumann",
"T.",
""
],
[
"Amthor",
"A. M.",
""
],
[
"Bazin",
"D.",
""
],
[
"Folden",
"C. M.",
"III"
],
[
"Gade",
"A.",
""
],
[
"Ginter",
"T. N.",
""
],
[
"Hausmann",
"M.",
""
],
[
"Matos",
"M.",
""
],
[
"Morrissey",
"D. J.",
""
],
[
"Nettleton",
"A.",
""
],
[
"Portillo",
"M.",
""
],
[
"Schiller",
"A.",
""
],
[
"Sherrill",
"B. M.",
""
],
[
"Stolz",
"A.",
""
],
[
"Thoennessen",
"M.",
""
]
] |
0705.0350 | Ruslan Sharipov | Ruslan Sharipov | Algorithms for laying points optimally on a plane and a circle | AmSTeX, 6 pages, amsppt style | null | null | null | cs.CG math.OC | null | Two averaging algorithms are considered which are intended for choosing an
optimal plane and an optimal circle approximating a group of points in
three-dimensional Euclidean space.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:41:44 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sharipov",
"Ruslan",
""
]
] |
0705.0351 | Nikodem Poplawski | Nikodem J. Poplawski | A unified, purely affine theory of gravitation and electromagnetism | 7 pages; extended analysis and discussion | null | null | null | gr-qc math-ph math.MP | null | In the purely affine formulation of gravity, the gravitational field is
represented by the symmetric part of the Ricci tensor of the affine connection.
The classical electromagnetic field can be represented in this formulation by
the second Ricci tensor of the connection. Such a construction is dynamically
equivalent to the sourceless Einstein-Maxwell equations. We generalize this
construction to the case with sources, represented by the derivative of the
affine Lagrangian density with respect to the connection. We show that the
Maxwell equations with sources emerge for the simplest affine Lagrangian for
matter, while the Einstein and Lorentz equations arise if mass has
electromagnetic origin. We also show that the Maxwell equations replace the
unphysical constraint imposed by the projective invariance of purely affine
Lagrangians that depend explicitly on the connection.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:49:28 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 18:21:36 GMT"
},
{
"version": "v3",
"created": "Tue, 22 May 2007 14:52:36 GMT"
},
{
"version": "v4",
"created": "Thu, 12 Jul 2007 01:36:00 GMT"
}
] | 2007-07-12T00:00:00 | [
[
"Poplawski",
"Nikodem J.",
""
]
] |
0705.0352 | Chi-kwan Chan | Martin E. Pessah (1,3,4), Chi-kwan Chan (2,4), and Dimitrios Psaltis
(4,3) ((1) Institute for Advanced Study, (2) ITC, Center for Astrophysics,
(3) Astronomy Department, University of Arizona, (4) Physics Department,
University of Arizona) | Angular Momentum Transport in Accretion Disks: Scaling Laws in
MRI-driven Turbulence | Accepted for publication in ApJ Letters. Two color figures.
References added | null | 10.1086/522585 | null | astro-ph | null | We present a scaling law that predicts the values of the stresses obtained in
numerical simulations of saturated MRI-driven turbulence in non-stratified
shearing boxes. It relates the turbulent stresses to the strength of the
vertical magnetic field, the sound speed, the vertical size of the box, and the
numerical resolution and predicts accurately the results of 35 numerical
simulations performed for a wide variety of physical conditions. We use our
result to show that the saturated stresses in simulations with zero net
magnetic flux depend linearly on the numerical resolution and would become
negligible if the resolution were set equal to the natural dissipation scale in
astrophysical disks. We conclude that, in order for MRI-driven turbulent
angular momentum transport to be able to account for the large value of the
effective alpha viscosity inferred observationally, the disk must be threaded
by a significant vertical magnetic field and the turbulent magnetic energy must
be in near equipartition with the thermal energy. This result has important
implications for the spectra of accretion disks and their stability.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:00:02 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Aug 2007 15:48:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pessah",
"Martin E.",
""
],
[
"Chan",
"Chi-kwan",
""
],
[
"Psaltis",
"Dimitrios",
""
]
] |
0705.0353 | Jo\~ao Gama Oliveira | J. A. Almendral, J. G. Oliveira, L. L\'opez, M. A. F. Sanju\'an, and
J. F. F. Mendes | The interplay of university and industry through the FP5 network | 21 pages (including Appendix), 8 figures. Published online at
http://stacks.iop.org/1367-2630/9/183 | New J. of Phys. 9 (2007) 183 | 10.1088/1367-2630/9/6/183 | null | physics.soc-ph cond-mat.stat-mech physics.data-an | null | To improve the quality of life in a modern society it is essential to reduce
the distance between basic research and applications, whose crucial roles in
shaping today's society prompt us to seek their understanding. Existing studies
on this subject, however, have neglected the network character of the
interaction between university and industry. Here we use state-of-the-art
network theory methods to analyze this interplay in the so-called Framework
Programme--an initiative which sets out the priorities for the European Union's
research and technological development. In particular we study in the 5th
Framework Programme (FP5) the role played by companies and scientific
institutions and how they contribute to enhance the relationship between
research and industry. Our approach provides quantitative evidence that while
firms are size hierarchically organized, universities and research
organizations keep the network from falling into pieces, paving the way for an
effective knowledge transfer.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:50:55 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 10:20:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Almendral",
"J. A.",
""
],
[
"Oliveira",
"J. G.",
""
],
[
"López",
"L.",
""
],
[
"Sanjuán",
"M. A. F.",
""
],
[
"Mendes",
"J. F. F.",
""
]
] |
0705.0354 | Christian Wagner | Christian Wagner, Volker M\"uller and Matthias Steinmetz | Constraining dark energy via baryon acoustic oscillations in the
(an)isotropic light-cone power spectrum | 12 pages, 15 figures. Matches version published by A&A. Expanded
significantly compared to the previous version | Astron.Astrophys.487:63-74,2008 | 10.1051/0004-6361:20077688 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The measurement of the scale of the baryon acoustic oscillations (BAO) in the
galaxy power spectrum as a function of redshift is a promising method to
constrain the equation-of-state parameter of the dark energy w. To measure the
scale of the BAO precisely, a substantial volume of space must be surveyed. We
test whether light-cone effects are important and whether the scaling relations
used to compensate for an incorrect reference cosmology are in this case
sufficiently accurate. We investigate the degeneracies in the cosmological
parameters and the benefits of using the two-dimensional anisotropic power
spectrum. Finally, we estimate the uncertainty with which w can be measured by
proposed surveys at redshifts of about z=3 and z=1, respectively.
In the simulated survey we find that light-cone effects are small and that
the simple scaling relations used to correct for the cosmological distortion
work fairly well even for large survey volumes. The analysis of the
two-dimensional anisotropic power spectra enables an independent determination
to be made of the apparent scale of the BAO, perpendicular and parallel to the
line of sight. This is essential for two-parameter w-models, such as the
redshift-dependent dark energy model w=w_0+(1-a)w_a. Using Planck priors for
the matter and baryon density and Delta(H_0)=5% for the Hubble constant, we
estimate that the BAO measurements of future surveys around z=3 and z=1 will be
able to constrain, independently of other cosmological probes, a constant w to
~ 12% and ~ 11% (68% c.l.), respectively.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 19:58:54 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Oct 2008 16:41:29 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Wagner",
"Christian",
""
],
[
"Müller",
"Volker",
""
],
[
"Steinmetz",
"Matthias",
""
]
] |
0705.0355 | Maxim A. Voronkov | M. A. Voronkov, K. J. Brooks, A. M. Sobolev, S. P. Ellingsen, A. B.
Ostrovskii, J. L. Caswell | The Australia Telescope campaign to study southern class I methanol
masers | 2 pages, 1 figure (composed from 3 files), to appear in proceedings
of IAU Symposium 242 "Astrophysical masers and their environment" (eds. J.
Chapman and W. Baan) | null | 10.1017/S1743921307012902 | null | astro-ph | null | The Australia Telescope Compact Array (ATCA) and the Mopra facility have been
used to search for new southern class I methanol masers at 9.9, 25 (J=5) and
104 GHz, which are thought to trace more energetic conditions in the interface
regions of molecular outflows, than the widespread class I masers at 44 and 95
GHz. One source shows a clear outflow association.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 23:06:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Voronkov",
"M. A.",
""
],
[
"Brooks",
"K. J.",
""
],
[
"Sobolev",
"A. M.",
""
],
[
"Ellingsen",
"S. P.",
""
],
[
"Ostrovskii",
"A. B.",
""
],
[
"Caswell",
"J. L.",
""
]
] |
0705.0356 | Eric B. Ford | Eric B. Ford, Matthew J. Holman (Harvard-Smithsonian Center for
Astrophysics) | Using Transit Timing Observations to Search for Trojans of Transiting
Extrasolar Planets | submitted to ApJL, 12 pages, 2 figures | ApJL, Vol. 664, L51-L54 (2007) | 10.1086/520579 | null | astro-ph | null | Theoretical studies predict that Trojans are likely a frequent byproduct of
planet formation and evolution. We examine the sensitivity of transit timing
observations for detecting Trojan companions to transiting extrasolar planets.
We demonstrate that this method offers the potential to detect terrestrial-mass
Trojans using existing ground-based observatories. We compare the transit
timing variation (TTV) method with other techniques for detecting extrasolar
Trojans and outline the future prospects for this method.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 02:25:33 GMT"
}
] | 2007-07-23T00:00:00 | [
[
"Ford",
"Eric B.",
"",
"Harvard-Smithsonian Center for\n Astrophysics"
],
[
"Holman",
"Matthew J.",
"",
"Harvard-Smithsonian Center for\n Astrophysics"
]
] |
0705.0357 | Joshua Peek | J. E. G. Peek, M. E. Putman, Jesper Sommer-Larsen | Ongoing Galactic Accretion: Simulations and Observations of Condensed
Gas in Hot Halos | 10 pages, 6 figures, ApJ Accepted. Some changes to technique | null | 10.1086/524374 | null | astro-ph | null | Ongoing accretion onto galactic disks has been recently theorized to progress
via the unstable cooling of the baryonic halo into condensed clouds. These
clouds have been identified as analogous to the High-Velocity Clouds (HVCs)
observed in HI in our Galaxy. Here we compare the distribution of HVCs observed
around our own Galaxy and extra-planar gas around the Andromeda galaxy to these
possible HVC analogs in a simulation of galaxy formation that naturally
generates these condensed clouds. We find a very good correspondence between
these observations and the simulation, in terms of number, angular size,
velocity distribution, overall flux and flux distribution of the clouds. We
show that condensed cloud accretion only accounts for ~ 0.2 M_solar / year of
the current overall Galactic accretion in the simulations. We also find that
the simulated halo clouds accelerate and become more massive as they fall
toward the disk. The parameter space of the simulated clouds is consistent with
all of the observed HVC complexes that have distance constraints, except the
Magellanic Stream which is known to have a different origin. We also find that
nearly half of these simulated halo clouds would be indistinguishable from
lower-velocity gas and that this effect is strongest further from the disk of
the galaxy, thus indicating a possible missing population of HVCs. These
results indicate that the majority of HVCs are consistent with being infalling,
condensed clouds that are a remnant of Galaxy formation.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:01:22 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 06:01:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Peek",
"J. E. G.",
""
],
[
"Putman",
"M. E.",
""
],
[
"Sommer-Larsen",
"Jesper",
""
]
] |
0705.0358 | Henk Hoekstra | Henk Hoekstra | Comparison of weak lensing masses and X-ray properties of galaxy
clusters | 16 pages, 8 figures. Revised version submitted to MNRAS (after minor
corrections suggested by referee) | Mon.Not.Roy.Astron.Soc.379:317-330,2007 | 10.1111/j.1365-2966.2007.11951.x | null | astro-ph | null | We present measurements of the masses of 20 X-ray luminous clusters of
galaxies at intermediate redshifts, determined from a weak lensing analysis of
deep archival R-band data obtained using the Canada-France-Hawaii-Telescope.
Compared to previous work, our analysis accounts for a number of effects that
are typically ignored, but can lead to small biases, or incorrect error
estimates. We derive masses that are essentially model independent and find
that they agree well with measurements of the velocity dispersion of cluster
galaxies and with the results of X-ray studies. Assuming a power law between
the lensing mass and the X-ray temperature, M_2500 T^alpha, we find a best fit
slope of alpha=1.34^{+0.30}_{-0.28}. This slope agrees with self-similar
cluster models and studies based on X-ray data alone. For a cluster with a
temperature of kT=5keV we obtain a mass M_{2500}=(1.4+-0.2)\times
10^{14}h^{-1}Msun in fair agreement with recent Chandra and XMM studies.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:05:55 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hoekstra",
"Henk",
""
]
] |
0705.0359 | Konstantinos Tassis | Konstantinos Tassis (University of Chicago) | The Shapes of Molecular Cloud Cores in Orion | 5 pages, 3 figures, accepted for publication in MNRAS Letters | Mon.Not.Roy.Astron.Soc.Lett.379:L50-L54,2007 | 10.1111/j.1745-3933.2007.00332.x | null | astro-ph | null | We investigate the intrinsic shapes of starless cores in the Orion GMC, using
the prestellar core sample of Nutter and Ward-Thompson (2007), which is based
on submillimeter SCUBA data. We employ a maximum-likelihood method to
reconstruct the intrinsic distribution of ellipsoid axial ratios from the axial
ratios of projected plane-of-the-sky core ellipses. We find that, independently
of the details of the assumed functional form of the distribution, there is a
strong preference for oblate cores of finite thickness. Cores with varying
finite degrees of triaxiality are a better fit than purely axisymmetric cores
although cores close to axisymmetry are not excluded by the data. The incidence
of prolate starless cores in Orion is found to be very infrequent. We also test
the consistency of the observed data with a uniform distribution of intrinsic
shapes, which is similar to those found in gravoturbulent fragmentation
simulations. This distribution is excluded at the 0.1% level. These findings
have important implications for theories of core formation within molecular
clouds.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:01:46 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Tassis",
"Konstantinos",
"",
"University of Chicago"
]
] |
0705.0360 | Michael Stone | Smitha Vishveshwara, Michael Stone, Diptiman Sen | Correlators and fractional statistics in the quantum Hall bulk | 4 pages, 3 figures, RevTeX | Phys. Rev. Lett. 99, 190401 (2007) | 10.1103/PhysRevLett.99.190401 | null | cond-mat.mes-hall | null | We derive single-particle and two-particle correlators of anyons in the
presence of a magnetic field in the lowest Landau level. We show that the
two-particle correlator exhibits signatures of fractional statistics which can
distinguish anyons from their fermionic and bosonic counterparts. These
signatures include the zeroes of the two-particle correlator and its exclusion
behavior. We find that the single-particle correlator in finite geometries
carries valuable information relevant to experiments in which quasiparticles on
the edge of a quantum Hall system tunnel through its bulk.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:11:35 GMT"
}
] | 2012-01-20T00:00:00 | [
[
"Vishveshwara",
"Smitha",
""
],
[
"Stone",
"Michael",
""
],
[
"Sen",
"Diptiman",
""
]
] |
0705.0361 | Ildar Gabitov | Natalia M. Litchinitser, Ildar R. Gabitov, Andrei I. Maimistov | Optical Bistability in Nonlinear Optical Coupler with Negative Index
Channel | null | null | 10.1103/PhysRevLett.99.113902 | null | physics.optics | null | We discuss a novel kind of nonlinear coupler with one channel filled with a
negative index material (NIM). The opposite directionality of the phase
velocity and the energy flow in the NIM channel facilitates an effective
feedback mechanism that leads to optical bistability and gap soliton formation.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:14:45 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 21:19:36 GMT"
},
{
"version": "v3",
"created": "Sat, 5 May 2007 04:51:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Litchinitser",
"Natalia M.",
""
],
[
"Gabitov",
"Ildar R.",
""
],
[
"Maimistov",
"Andrei I.",
""
]
] |
0705.0362 | Adel Bilal | Adel Bilal | (Non) Gauge Invariance of Wilsonian Effective Actions in
(Supersymmetric) Gauge Theories : A Critical Discussion | 39 pages, 3 figures; several comments in sect. 2.6 and references are
added | Annals Phys.323:2311-2348,2008 | 10.1016/j.aop.2008.01.002 | LPTENS-07/18 | hep-th | null | We give a detailed critical discussion of the properties of Wilsonian
effective actions, defined by integrating out all modes above a given scale
$\mu$. In particular, we provide a precise and relatively convenient
prescription how to implement the infrared cutoff $\mu$ in any loop integral
that is manifestly Lorentz invariant and also preserves global linear
symmetries such as e.g. supersymmetry. We discuss the issue of gauge invariance
of effective actions in general and in particular when using background field
gauge. Our prescription for the IR cutoff (as any such prescription) breaks the
gauge symmetry. Using our prescription, we have explicitly computed, at one
loop, many terms of the Wilsonian effective action for general gauge theories,
involving bosonic and fermionic matter fields of arbitrary masses and in
arbitrary representations, exhibiting the non-gauge invariant (as well as the
gauge invariant) terms. However, for supersymmetric gauge theories all
non-gauge invariant terms cancel within each supermultiplet. This is strong
evidence that in supersymmetric gauge theories this indeed defines a Lorentz,
susy and gauge invariant Wilsonian effective action. As a byproduct, we obtain
the explicit one-loop Wilsonian couplings for all higher-derivative terms $F
D^{2n}F$ in the effective action of arbitrary supersymmetric gauge theories.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:20:26 GMT"
},
{
"version": "v2",
"created": "Tue, 15 May 2007 09:39:18 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Bilal",
"Adel",
""
]
] |
0705.0363 | Mohsen Nejad-Asghar | M. Nejad-Asghar | Formation of Fluctuations in the Molecular Slab via Isobaric Thermal
Instability | 21 pages, 6 figures, 1 table, accepted by MNRAS | Mon.Not.Roy.Astron.Soc.379:222-228,2007 | 10.1111/j.1365-2966.2007.11933.x | null | astro-ph | null | The frictional heating by ion-neutral drift is calculated and its effect on
isobaric thermal instability is carried out. Ambipolar drift heating of
one-dimensional self-gravitating magnetized molecular slab is used under the
assumptions of quasi-magnetohydrostatic and local ionization equilibrium. We
see that ambipolar drift heating is inversely proportional to density and its
value in some regions of the slab can be significantly larger than the average
heating rates of cosmic rays and turbulent motions. The results show that the
isobaric thermal instability can occur in some regions of the slab; therefore
it may produce the slab fragmentation and formation of the AU-scale
condensations.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:22:19 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Nejad-Asghar",
"M.",
""
]
] |
0705.0364 | Arthur Gubeskys | Arthur Gubeskys and Boris A. Malomed | Symmetric and asymmetric solitons in linearly coupled Bose-Einstein
condensates trapped in optical lattices | 21 pages + 24 figs, accepted to Phys. Rev. A | null | 10.1103/PhysRevA.75.063602 | null | nlin.PS | null | We study spontaneous symmetry breaking in a system of two parallel
quasi-one-dimensional traps, equipped with optical lattices (OLs) and filled
with a Bose-Einstein condensate (BEC). The cores are linearly coupled by
tunneling. Analysis of the corresponding system of linearly coupled
Gross-Pitaevskii equations (GPEs) reveals that spectral bandgaps of the single
GPE split into subgaps. Symmetry breaking in two-component BEC solitons is
studied in cases of the attractive (AA) and repulsive (RR) nonlinearity in both
traps; the mixed situation, with repulsion in one trap and attraction in the
other (RA), is considered too. In all the cases, stable asymmetric solitons are
found, bifurcating from symmetric or antisymmetric ones (and destabilizing
them), in the AA and RR systems, respectively. In either case, bi-stability is
predicted, with a nonbifurcating stable branch, either antisymmetric or
symmetric, coexisting with asymmetric ones. Solitons destabilized by the
bifurcation tend to rearrange themselves into their stable asymmetric
counterparts. The impact of a phase mismatch, between the OLs in the two cores
is also studied. Also considered is a related model, for a binary BEC in a
single-core trap with the OL, assuming that the two species (representing
different spin states of the same atom) are coupled by linear interconversion.
In that case, the symmetry-breaking bifurcations in the AA and RR models switch
their character, if the inter-species nonlinear interaction becomes stronger
than the intra-species nonlinearity.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:23:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gubeskys",
"Arthur",
""
],
[
"Malomed",
"Boris A.",
""
]
] |
0705.0365 | Vivien Zapf | V. S. Zapf, V. F. Correa, P. Sengupta, C. D. Batista, M. Tsukamoto, N.
Kawashima, P. Egan, C. Pantea, A. Migliori, J. B. Betts, M. Jaime, A.
Paduan-Filho | Using magnetostriction to measure the spin-spin correlation function and
magnetoelastic coupling in the quantum magnet NiCl$_2$-4SC(NH$_2$)$_2$ | null | null | null | null | cond-mat.str-el cond-mat.mtrl-sci | null | We report a method for determining the spatial dependence of the magnetic
exchange coupling, $dJ/dr$, from magnetostriction measurements of a quantum
magnet. The organic Ni $S = 1$ system NiCl$_2$-4SC(NH$_2$)$_2$ exhibits lattice
distortions in response to field-induced canted antiferromagnetism between
$H_{c1} = 2.1$ T and $H_{c2} = 12.6$ T. We are able to model the
magnetostriction in terms of uniaxial stress on the sample created by magnetic
interactions between neighboring Ni atoms along the c-axis. The uniaxial strain
is equal to $(1/E)dJ_c/dx_c < S_{\bf r} \cdot S_{{\bf r}+ {\bf e}_c} >$, where
$E$, $J_c$, $x_c$ and ${\bf e}_c$ are the Young's modulus, the nearest neighbor
(NN) exchange coupling, the variable lattice parameter, and the relative vector
between NN sites along the c-axis. We present magnetostriction data taken at 25
mK together with Quantum Monte Carlo calculations of the NN spin-spin
correlation function that are in excellent agreement with each other. We have
also measured Young's modulus using resonant ultrasound, and we can thus
extract $dJ_c/dx_c = 2.5$ K/$\AA$, yielding a total change in $J_c$ between
$H_{c1}$ and $H_{c2}$ of 5.5 mK or 0.25% in response to an 0.022% change in
length of the sample.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:23:15 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Zapf",
"V. S.",
""
],
[
"Correa",
"V. F.",
""
],
[
"Sengupta",
"P.",
""
],
[
"Batista",
"C. D.",
""
],
[
"Tsukamoto",
"M.",
""
],
[
"Kawashima",
"N.",
""
],
[
"Egan",
"P.",
""
],
[
"Pantea",
"C.",
""
],
[
"Migliori",
"A.",
""
],
[
"Betts",
"J. B.",
""
],
[
"Jaime",
"M.",
""
],
[
"Paduan-Filho",
"A.",
""
]
] |
0705.0366 | Beno\^it Gr\'emaud | B. Gremaud, D. Delande, C.A. Muller, and C. Miniatura | Comment on ``Intensity correlations and mesoscopic fluctuations of
diffusing photons in cold atoms'' | 1 page. Comment submitted to PRL | null | 10.1103/PhysRevLett.100.199301 | null | cond-mat.mes-hall physics.atom-ph quant-ph | null | In a recent Letter (Phys. Rev. Lett. \textbf{98}, 083601 (2007),
arXiv:cond-mat/0610804), O. Assaf and E. Akkermans claim that the angular
correlations of the light intensity scattered by a cloud of cold atoms with
internal degeneracy (Zeeman sublevels) of the ground state overcome the usual
Rayleigh law. More precisely, they found that they become exponentially large
with the size of the sample. In what follows, we will explain why their results
are wrong and, in contrary, why the internal degeneracy leads to lower
intensity correlations.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:29:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gremaud",
"B.",
""
],
[
"Delande",
"D.",
""
],
[
"Muller",
"C. A.",
""
],
[
"Miniatura",
"C.",
""
]
] |
0705.0367 | Alexander Conley | A. Conley, R. G. Carlberg, J. Guy, D. A. Howell, S. Jha, A. G. Riess,
M. Sullivan | Is there Evidence for a Hubble bubble? The Nature of Type Ia Supernova
Colors and Dust in External Galaxies | Further information and data at
http://qold.astro.utoronto.ca/conley/bubble/ Accepted for publication in ApJL | Astrophys.J.664:L13-L16,2007 | 10.1086/520625 | null | astro-ph | null | We examine recent evidence from the luminosity-redshift relation of Type Ia
Supernovae (SNe Ia) for the $\sim 3 \sigma$ detection of a ``Hubble bubble'' --
a departure of the local value of the Hubble constant from its globally
averaged value \citep{Jha:07}. By comparing the MLCS2k2 fits used in that study
to the results from other light-curve fitters applied to the same data, we
demonstrate that this is related to the interpretation of SN color excesses
(after correction for a light-curve shape-color relation) and the presence of a
color gradient across the local sample. If the slope of the linear relation
($\beta$) between SN color excess and luminosity is fit empirically, then the
bubble disappears. If, on the other hand, the color excess arises purely from
Milky Way-like dust, then SN data clearly favors a Hubble bubble. We
demonstrate that SN data give $\beta \simeq 2$, instead of the $\beta \simeq 4$
one would expect from purely Milky-Way-like dust. This suggests that either SN
intrinsic colors are more complicated than can be described with a single
light-curve shape parameter, or that dust around SN is unusual. Disentangling
these possibilities is both a challenge and an opportunity for large-survey SN
Ia cosmology.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:30:36 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 20:28:46 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Conley",
"A.",
""
],
[
"Carlberg",
"R. G.",
""
],
[
"Guy",
"J.",
""
],
[
"Howell",
"D. A.",
""
],
[
"Jha",
"S.",
""
],
[
"Riess",
"A. G.",
""
],
[
"Sullivan",
"M.",
""
]
] |
0705.0368 | Lifan Wang | Lifan Wang | Cosmic Streaming Field at Low Redshift | ApJ, submitted (Figures reformated to fit the pages, a new table is
added) | null | null | null | astro-ph | null | We study the expansion of the nearby Universe using a sample of Type Ia
supernovae at redshifts below 0.08. These supernovae allow peculiar velocities
to be measured at unprecedented precision. We have investigated in detail the
possibility of a varying Hubble constant with redshift and found no evidence of
a monopole term for the nearby Universe. A large scale streaming motion is
found at an amplitude of about $340^{63}_{-71}$ km/sec, aligned in the
direction of $(l_0, b_0) = (312^{\rm o}.0^{13.5}_{-7.4}, 25^{\rm
o}.7^{8.0}_{-9.2})$, which is close to the direction of the center of Shapley
supercluster of galaxies. The large scale streaming motion is best fit by a
function involving a strong bipolar term. The streaming velocity field extends
from the lowest redshift ($\sim 0.007$) to beyond 0.025 and likely out to even
higher redshifts. The velocity field at redshift below 0.01 can be equally well
described by a dipole field or by the same bipolar streaming velocity field
that reaches out to beyond $z \sim 0.025$. We are also able to deduce a robust
estimate of the random velocity component of the peculiar velocity field.
Within the volume of redshift below 0.01 (weighted average redshift of $\sim$
0.067), this thermal component is found to be about 270 km/sec. After
correcting this smooth streaming motion, we are able to significantly improve
the Hubble expansion fits of these supernovae. The CMAGIC method gives a
dramatic decrease of $\chi^2$ from 90 to 63 for 69 degrees of freedom, and
yields a residual scatter of only 0.12 magnitude; the maximum light method
gives also a moderate improvement.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 19:44:34 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 18:22:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Wang",
"Lifan",
""
]
] |
0705.0369 | Vlad Gheorghiu | Vlad Gheorghiu, and Robert B. Griffiths | Entanglement transformations using separable operations | Replaced with the published version. Any comments are welcome | Phys. Rev. A 76, 032310 (2007) | 10.1103/PhysRevA.76.032310 | null | quant-ph | null | We study conditions for the deterministic transformation
$\ket{\psi}\longrightarrow\ket{\phi}$ of a bipartite entangled state by a
separable operation. If the separable operation is a local operation with
classical communication (LOCC), Nielsen's majorization theorem provides
necessary and sufficient conditions. For the general case we derive a necessary
condition in terms of products of Schmidt coefficients, which is equivalent to
the Nielsen condition when either of the two factor spaces is of dimension 2,
but is otherwise weaker. One implication is that no separable operation can
reverse a deterministic map produced by another separable operation, if one
excludes the case where the Schmidt coefficients of $\ket{\psi}$ and are the
same as those of $\ket{\phi}$. The question of sufficient conditions in the
general separable case remains open. When the Schmidt coefficients of
$\ket{\psi}$ are the same as those of $\ket{\phi}$, we show that the Kraus
operators of the separable transformation restricted to the supports of
$\ket{\psi}$ on the factor spaces are proportional to unitaries. When that
proportionality holds and the factor spaces have equal dimension, we find
conditions for the deterministic transformation of a collection of several full
Schmidt rank pure states $\ket{\psi_j}$ to pure states $\ket{\phi_j}$.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:35:22 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Sep 2007 00:27:33 GMT"
}
] | 2007-09-19T00:00:00 | [
[
"Gheorghiu",
"Vlad",
""
],
[
"Griffiths",
"Robert B.",
""
]
] |
0705.0370 | Alejandro Romanelli | A. Romanelli, R. Siri, V. Micenmacher | Sub-ballistic behavior in quantum systems with L\'evy noise | 4 pages, 4 figures | Phys. Rev. E 76, 037202 (2007) | 10.1103/PhysRevE.76.037202 | null | quant-ph | null | We investigate the quantum walk and the quantum kicked rotor in resonance
subjected to noise with a L\'evy waiting time distribution. We find that both
systems have a sub-ballistic wave function spreading as shown by a power-law
tail of the standard deviation.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:42:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Romanelli",
"A.",
""
],
[
"Siri",
"R.",
""
],
[
"Micenmacher",
"V.",
""
]
] |
0705.0371 | Dmitry Garanin | C. Calero, E. M. Chudnovsky, and D. A. Garanin | Magneto-elastic waves in crystals of magnetic molecules | 8 PR pages, 3 figures | null | 10.1103/PhysRevB.76.094419 | null | cond-mat.stat-mech cond-mat.mtrl-sci | null | We study magneto-elastic effects in crystals of magnetic molecules. Coupled
equations of motion for spins and sound are derived and the possibility of
strong resonant magneto-acoustic coupling is demonstrated. Dispersion laws for
interacting linear sound and spin excitations are obtained for bulk and surface
acoustic waves. We show that ultrasound can generate inverse population of spin
levels. Alternatively, the decay of the inverse population of spin levels can
generate ultrasound. Possibility of solitary waves of the magnetization
accompanied by the elastic twists is demonstrated.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:45:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Calero",
"C.",
""
],
[
"Chudnovsky",
"E. M.",
""
],
[
"Garanin",
"D. A.",
""
]
] |
0705.0372 | Vladimir Vovk | Vladimir Vovk | Merging of opinions in game-theoretic probability | 26 pages | null | null | null | math.PR | null | This paper gives game-theoretic versions of several results on "merging of
opinions" obtained in measure-theoretic probability and algorithmic randomness
theory. An advantage of the game-theoretic versions over the measure-theoretic
results is that they are pointwise, their advantage over the algorithmic
randomness results is that they are non-asymptotic, but the most important
advantage over both is that they are very constructive, giving explicit and
efficient strategies for players in a game of prediction.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:48:49 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Vovk",
"Vladimir",
""
]
] |
0705.0373 | Aninda Sinha | Aninda Sinha, Julian Sonner | Black Hole Giants | 28 pages; minor typos, factors of 2 corrected in section 4.1, version
to appear in JHEP | JHEP 0708:006,2007 | 10.1088/1126-6708/2007/08/006 | DAMTP-2007-36 | hep-th | null | We investigate giant and dual giant type BPS configurations in the
near-horizon geometry of a certain 1/16-BPS AdS_5 black hole. By quantising the
space of solutions we count the dual giant configurations and compare with the
black hole entropy. This suggests a missing degeneracy factor which we argue
comes from an angular momentum quantum number. From the D-brane world volume
this arises from BPS electromagnetic waves. We study these waves in the context
of giants and dual giants in the black hole near-horizon geometry. We further
demonstrate that turning on waves on the world-volume of 1/8-BPS dual giants in
AdS_5 x S^5 leads to 1/16-BPS states with an additional angular momentum
quantum number.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:51:13 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 15:26:00 GMT"
},
{
"version": "v3",
"created": "Tue, 21 Aug 2007 09:33:43 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Sinha",
"Aninda",
""
],
[
"Sonner",
"Julian",
""
]
] |
0705.0374 | Razvan Radulescu M.D. | Razvan T. Radulescu, Angelika Jahn, Daniela Hellmann and Gregor
Weirich | Immunohistochemical pitfalls in the demonstration of insulin-degrading
enzyme in normal and neoplastic human tissues | 17 pages, 6 figures | null | null | null | q-bio.TO q-bio.QM | null | Previously, we have identified the cytoplasmic zinc metalloprotease
insulin-degrading enzyme(IDE) in human tissues by an immunohistochemical method
involving no antigen retrieval (AR) by pressure cooking to avoid artifacts by
endogenous biotin exposure and a detection kit based on the labeled
streptavidin biotin (LSAB) method. Thereby, we also employed 3% hydrogen
peroxide(H2O2) for the inhibition of endogenous peroxidase activity and
incubated the tissue sections with the biotinylated secondary antibody at room
temperature (RT). We now add the immunohistochemical details that had led us to
this optimized procedure as they also bear a more general relevance when
demonstrating intracellular tissue antigens. Our most important result is that
endogenous peroxidase inhibition by 0.3% H2O2 coincided with an apparently
positive IDE staining in an investigated breast cancer specimen whereas
combining a block by 3% H2O2 with an incubation of the biotinylated secondary
antibody at RT, yet not at 37 degrees Celsius, revealed this specimen as almost
entirely IDE-negative. Our present data caution against three different
immunohistochemical pitfalls that might cause falsely positive results and
artifacts when using an LSAB- and peroxidase-based detection method: pressure
cooking for AR, insufficient quenching of endogenous peroxidases and heating of
tissue sections while incubating with biotinylated secondary antibodies.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 20:56:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Radulescu",
"Razvan T.",
""
],
[
"Jahn",
"Angelika",
""
],
[
"Hellmann",
"Daniela",
""
],
[
"Weirich",
"Gregor",
""
]
] |
0705.0375 | Enrique Solano | C. E. Lopez, J. C. Retamal, and E. Solano | Selective Control of the Symmetric Dicke Subspace in Trapped Ions | 5 pages and 1 figure. New version with minor changes and added
references. Accepted in Physical Review A | Phys. Rev. A 76, 033413 (2007) | 10.1103/PhysRevA.76.033413 | null | quant-ph | null | We propose a method of manipulating selectively the symmetric Dicke subspace
in the internal degrees of freedom of N trapped ions. We show that the direct
access to ionic-motional subspaces, based on a suitable tuning of
motion-dependent AC Stark shifts, induces a two-level dynamics involving
previously selected ionic Dicke states. In this manner, it is possible to
produce, sequentially and unitarily, ionic Dicke states with increasing
excitation number. Moreover, we propose a probabilistic technique to produce
directly any ionic Dicke state assuming suitable initial conditions.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 16:36:52 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 19:42:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lopez",
"C. E.",
""
],
[
"Retamal",
"J. C.",
""
],
[
"Solano",
"E.",
""
]
] |
0705.0376 | Oscar Rosas-Ortiz | Oscar Rosas-Ortiz | On the Dirac-Infeld-Plebanski delta function | LaTeX file, 15 pages no figures | null | 10.1142/9789812772732_0031 | null | quant-ph hep-th physics.hist-ph | null | The present work is a brief review of the progressive search of improper
delta-functions which are of interest in Quantum Mechanics and in the problem
of motion in General Relativity Theory.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 21:19:15 GMT"
}
] | 2018-08-08T00:00:00 | [
[
"Rosas-Ortiz",
"Oscar",
""
]
] |
0705.0377 | Rudolf Tange | Rudolf Tange | The symplectic ideal and a double centraliser theorem | null | null | 10.1112/jlms/jdm108 | null | math.AC math.RT | null | We interpret a result of S. Oehms as a statement about the symplectic ideal.
We use this result to prove a double centraliser theorem for the symplectic
group acting on \bigoplus_{r=0}^s\otimes^rV, where V is the natural module for
the symplectic group. This result was obtained in characteristic zero by H.
Weyl. Furthermore we use this to extend to arbitrary connected reductive groups
G with simply connected derived group the earlier result of the author that the
algebra K[G]^g of infinitesimal invariants in the algebra of regular functions
on G is a unique factorisation domain.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 21:33:41 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Tange",
"Rudolf",
""
]
] |
0705.0378 | Haidong Yuan | Haidong Yuan, Steffen J. Glaser, N. Khaneja | Geodesics for Efficient Creation and Propagation of Order along Ising
Spin Chains | null | null | 10.1103/PhysRevA.76.012316 | null | quant-ph | null | Experiments in coherent nuclear and electron magnetic resonance, and optical
spectroscopy correspond to control of quantum mechanical ensembles, guiding
them from initial to final target states by unitary transformations. The
control inputs (pulse sequences) that accomplish these unitary transformations
should take as little time as possible so as to minimize the effects of
relaxation and decoherence and to optimize the sensitivity of the experiments.
Here we give efficient syntheses of various unitary transformations on Ising
spin chains of arbitrary length. The efficient realization of the unitary
transformations presented here is obtained by computing geodesics on a sphere
under a special metric. We show that contrary to the conventional belief, it is
possible to propagate a spin order along an Ising spin chain with coupling
strength J (in units of Hz), significantly faster than 1/(2J) per step. The
methods presented here are expected to be useful for immediate and future
applications involving control of spin dynamics in coherent spectroscopy and
quantum information processing.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 21:36:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yuan",
"Haidong",
""
],
[
"Glaser",
"Steffen J.",
""
],
[
"Khaneja",
"N.",
""
]
] |
0705.0379 | Mikhail Shifman | S. Bolognesi, M. Shifman | Supersymmetric Q Solitons of Arbitrary Genus | 54 pages, 20 figures; v. 2: reference added; v.3:references added,
title changed. Final version accpted for publication in PRD | Phys.Rev.D76:125024,2007 | 10.1103/PhysRevD.76.125024 | FTPI-MINN-07/16, UMN-TH-2603/07 | hep-th | null | We construct "Flying Saucer" solitons in supersymmetric N=2 gauge theory
which is known to support BPS domain walls with a U(1) gauge field localized on
its worldvolume. We demonstrate that this model supports exotic particle-like
solitons whose topology is largely arbitrary: closed orientable surfaces in
three-dimensional space which can have arbitrary genus. In particular, we focus
on Q tori. Q tori and similar solitons of higher genera are obtained by folding
the domain wall into an appropriate surface. Nontrivial cycles on the domain
wall worldvolume (handles) are stabilized by crossed electric and magnetic
fields inside the folded domain wall. Three distinct frameworks are used to
prove the existence of these Flying Saucer solitons and study their properties:
the worldvolume description (including the Dirac-Born-Infeld action), the bulk
theory description in the sigma-model limit, and the bulk theory description in
the thin-edge approximation. In the sigma-model framework the Q torus is shown
to be related to the Hopf Skyrmion studied previously.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 21:37:52 GMT"
},
{
"version": "v2",
"created": "Wed, 9 May 2007 20:09:30 GMT"
},
{
"version": "v3",
"created": "Mon, 29 Oct 2007 21:31:32 GMT"
}
] | 2010-05-27T00:00:00 | [
[
"Bolognesi",
"S.",
""
],
[
"Shifman",
"M.",
""
]
] |
0705.0380 | Elise Furlan | E. Furlan (1), B. Sargent (2), N. Calvet (3), W. J. Forrest (2), P.
D'Alessio (4), L. Hartmann (3), D. M. Watson (2), J. D. Green (2), J. Najita
(5), C. H. Chen (5) ((1) NAI/UCLA, Los Angeles, CA, (2) University of
Rochester, Rochester, NY, (3) University of Michigan, Ann Arbor, MI, (4)
UNAM, Morelia, Mexico, (5) NOAO, Tucson, AZ) | HD 98800: A 10-Myr-Old Transition Disk | 10 pages, 8 figures | Astrophys.J.664:1176-1184,2007 | 10.1086/519301 | null | astro-ph | null | We present the mid-infrared spectrum, obtained with the Spitzer Infrared
Spectrograph (IRS), of HD 98800, a quadruple star system located in the
10-Myr-old TW Hydrae association. It has a known mid-infrared excess that
arises from a circumbinary disk around the B components of the system. The IRS
spectrum confirms that the disk around HD 98800 B displays no excess emission
below about 5.5 micron, implying an optically thick disk wall at 5.9 AU and an
inner, cleared-out region; however, some optically thin dust, consisting mainly
of 3-micron-sized silicate dust grains, orbits the binary in a ring between 1.5
and 2 AU. The peculiar structure and apparent lack of gas in the HD 98800 B
disk suggests that this system is likely already at the debris disks stage,
with a tidally truncated circumbinary disk of larger dust particles and an
inner, second-generation dust ring, possibly held up by the resonances of a
planet. The unusually large infrared excess can be explained by gravitational
perturbations of the Aa+Ab pair puffing up the outer dust ring and causing
frequent collisions among the larger particles.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 21:43:54 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Furlan",
"E.",
""
],
[
"Sargent",
"B.",
""
],
[
"Calvet",
"N.",
""
],
[
"Forrest",
"W. J.",
""
],
[
"D'Alessio",
"P.",
""
],
[
"Hartmann",
"L.",
""
],
[
"Watson",
"D. M.",
""
],
[
"Green",
"J. D.",
""
],
[
"Najita",
"J.",
""
],
[
"Chen",
"C. H.",
""
]
] |
0705.0381 | William Krekelberg | William P. Krekelberg, Jeetain Mittal, Venkat Ganesan, Thomas M.
Truskett | How short-range attractions impact the structural order,
self-diffusivity, and viscosity of a fluid | 9 pages, 9 figures Submitted to The Journal of Chemical Physics | W. P. Krekelberg, J. Mittal, V. Ganesan, and T. M. Truskett,
Journal of Chemical Physics 127, 044502-1 - 044502-8 (2007). | 10.1063/1.2753154 | null | cond-mat.soft | null | We present molecular simulation data for viscosity, self-diffusivity, and the
local structural ordering of (i) a hard-sphere fluid and (ii) a square-well
fluid with short-range attractions. The latter fluid exhibits a region of
dynamic anomalies in its phase diagram, where its mobility increases upon
isochoric cooling, which is found to be a subset of a larger region of
structural anomalies, in which its pair correlations strengthen upon isochoric
heating. This "cascade of anomalies" qualitatively resembles that found in
recent simulations of liquid water. The results for the hard-sphere and
square-well systems also show that the breakdown of the Stokes-Einstein
relation upon supercooling occurs for conditions where viscosity and
self-diffusivity develop different couplings to the degree of pairwise
structural ordering of the liquid. We discuss how these couplings reflect
dynamic heterogeneities. Finally, we note that the simulation data suggests how
repulsive and attractive glasses may generally be characterized by two distinct
levels of short-range structural order.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 22:11:40 GMT"
}
] | 2007-09-06T00:00:00 | [
[
"Krekelberg",
"William P.",
""
],
[
"Mittal",
"Jeetain",
""
],
[
"Ganesan",
"Venkat",
""
],
[
"Truskett",
"Thomas M.",
""
]
] |
0705.0382 | Peter Steinberg | P. Steinberg (for the ATLAS Collaboration) | Heavy Ion Physics at the LHC with the ATLAS Detector | 9 pages, 8 figures, submitted to the Proceedings of Quark Matter
2006, Shanghai, China, November 14-20, 2006 | J.Phys.G34:S527-534,2007 | 10.1088/0954-3899/34/8/S43 | null | nucl-ex | null | The ATLAS detector at CERN will provide a high-resolution
longitudinally-segmented calorimeter and precision tracking for the upcoming
study of heavy ion collisions at the LHC (sqrt(s_NN)=5520 GeV). The calorimeter
covers |eta|<5 with both electromagnetic and hadronic sections, while the inner
detector spectrometer covers |eta|<2.5. ATLAS will study a full range of
observables necessary to characterize the hot and dense matter formed at the
LHC. Global measurements (particle multiplicities, collective flow) will
provide access into its thermodynamic and hydrodynamic properties. Measuring
complete jets out to 100's of GeV will allow detailed studies of energy loss
and its effect on jets. Quarkonia will provide a handle on deconfinement
mechanisms. ATLAS will also study the structure of the nucleon and nucleus
using forward physics probes and ultraperipheral collisions, both enabled by
segmented Zero Degree Calorimeters.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 22:14:13 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Steinberg",
"P.",
"",
"for the ATLAS Collaboration"
]
] |
0705.0383 | Alexander Velytsky | E.T. Tomboulis, A. Velytsky | String tension and removal of lattice coarsening effects in Monte Carlo
Renormalization Group | 10 pages, 3 figures, 3 tables | Int.J.Mod.Phys.A23:803-812,2008 | 10.1142/S0217751X0803958X | null | hep-lat | null | We study the computation of the static quark potential under decimations in
the Monte Carlo Renormalization Group (MCRG). Employing a multi-representation
plaquette action, we find that fine-tuning the decimation prescription so that
the MCRG equilibrium self-consistency condition is satisfied produces dramatic
improvement at large distances. In particular, lattice coarsening (change of
effective lattice spacing on action-generated lattices after decimation) is
nearly eliminated. Failure to correctly tune the decimation, on the other hand,
produces large coarsening effects, of order 50% or more, consistent with those
seen in previous studies. We also study rotational invariance restoration at
short distances, where no particular improvement is seen for this action.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 22:18:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tomboulis",
"E. T.",
""
],
[
"Velytsky",
"A.",
""
]
] |
0705.0384 | David Blaschke | D. Blaschke, M. Buballa, A.E. Radzhabov, M.K. Volkov | Effects of mesonic correlations in the QCD phase transition | 11 pages, 4 figures; version accepted for publication in Yad. Fiz.,
text extended, 1 figure added | Yad.Fiz.71:2012-2018,2008; Phys.Atom.Nucl.71:1981-1987,2008 | 10.1134/S1063778808110161 | null | hep-ph nucl-th | null | The finite temperature phase transition of strongly interacting matter is
studied within a nonlocal chiral quark model of the NJL type coupled to a
Polyakov loop. In contrast to previous investigations which were restricted to
the mean-field approximation, mesonic correlations are included by evaluating
the quark-antiquark ring sum. For physical pion masses, we find that the pions
dominate the pressure below the phase transition, whereas above T_c the
pressure is well described by the mean-field approximation result. For large
pion masses, as realized in lattice simulations, the meson effects are
suppressed.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 19:13:39 GMT"
},
{
"version": "v2",
"created": "Fri, 11 May 2007 14:54:41 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Mar 2008 11:34:49 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Blaschke",
"D.",
""
],
[
"Buballa",
"M.",
""
],
[
"Radzhabov",
"A. E.",
""
],
[
"Volkov",
"M. K.",
""
]
] |
0705.0385 | Wenwu Tian | W. W. Tian, D. A. Leahy, Q. D. Wang | Radio and X-ray images of SNR G18.8+0.3 interacting with molecular
clouds | 8 pages, 6 figures, two tables, accepted by A&A | null | 10.1051/0004-6361:20077527 | null | astro-ph | null | New HI images from the VLA Galactic Plane Survey (VGPS) show clear absorption
features associated with the supernova remnant (SNR) G18.8+0.3. High-resolution
$^{13}$CO images reveal that molecular clouds overlap the radio filaments of
G18.8+0.3. The $^{13}$CO emission spectrum over the full velocity range in the
direction of G18.8+0.3 shows two molecular components with high
brightness-temperatureand three molecular components with low
brightness-temperature, all with respective HI absorption. This implies that
these clouds are in front of G18.8+0.3. In the HI images, the highest velocity
absorption feature seen against the continuum image of G18.8+0.3 is at 129 km
s$^{-1}$, which corresponds to the tangent point in this direction. This yields
a lower distance limit of 6.9 kpc for G18.8+0.3. Absence of absorption at
negative velocities gives an upper distance limit of 15 kpc. The broadened
profile at 20$\pm$5 km s$^{-1}$ in the $^{13}$CO emission spectra is a strong
indicator of a possible SNR/CO cloud interaction. Thus, G18.8+0.3 is likely to
be at the distance of about 12 kpc. The upper mass limit and mean density of
the giant CO cloud at 20$\pm$5 km s$^{-1}$ are \sim 6 \times 10^{5} M_{\odot}
and \sim 2 \times 10^{2} cm^{-3}. We find an atomic hydrogen column density in
front of G18.8+0.3 of $N_{HI}$ \sim 2 \times 10^{22} cm^{-2}. The ROSAT PSPC
observations show a diffuse X-ray enhancement apparently associated with part
of the radio shell of G18.8+0.3. Assuming an association, the unabsorbed flux
is 2.2 \times10^{-12} erg cm^{-2} s^{-1}, suggesting an intrinsic luminosity of
3.6 \times 10^{34} erg s^{-1} for G18.8+0.3.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 22:26:17 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Jun 2007 17:04:05 GMT"
},
{
"version": "v3",
"created": "Tue, 14 Aug 2007 23:25:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tian",
"W. W.",
""
],
[
"Leahy",
"D. A.",
""
],
[
"Wang",
"Q. D.",
""
]
] |
0705.0386 | Dario Patane' | D. Patan\'e, R. Fazio, L. Amico | Bound entanglement in the XY model | 7 pages, 3 figures; some typos corrected, references added | New J. Phys. 9 (2007) 322 | 10.1088/1367-2630/9/9/322 | null | quant-ph cond-mat.stat-mech | null | We study the multi-spin entanglement for the 1D anisotropic XY model
concentrating on the simplest case of three-spin entanglement. As compared to
the pairwise entanglement, three-party quantum correlations have a longer range
and they are more robust on increasing the temperature.
We find regions of the phase diagram of the system where bound entanglement
occurs, both at zero and finite temperature. Bound entanglement in the ground
state can be obtained by tuning the magnetic field. Thermal bound entanglement
emerges naturally due to the effect of temperature on the free ground state
entanglement.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 22:34:48 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 09:37:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Patané",
"D.",
""
],
[
"Fazio",
"R.",
""
],
[
"Amico",
"L.",
""
]
] |
0705.0387 | Nicolas Tejos | Nicolas Tejos, Sebastian Lopez, Jason X. Prochaska, Hsiao-Wen Chen,
Miroslava Dessauges-Zavadsky | On the Incidence of C IV Absorbers Along the Sightlines to Gamma-Ray
Bursts | Accepted version (for publication in ApJ), results unchanged, 18
pages, 3 tables, 5 figures | null | 10.1086/523088 | null | astro-ph | null | We report on the statistics of strong (W_r > 0.15 A) C IV absorbers at
z=1.5-3.5 toward high-redshift gamma-ray bursts (GRBs). In contrast with a
recent survey for strong Mg II absorption systems at z < 2, we find that the
number of C IV absorbers per unit redshift dN/dz does not show a significant
deviation from previous surveys using quasi-stellar objects (QSOs) as
background sources. We find that the number density of C IV toward GRBs is
dN/dz(z~1.5)= 2.2 +2.8/-1.4, dN/dz(z~2.5)= 2.3 +1.8/-1.1 and dN/dz(z~3.5)= 1.1
+2.6/-0.9. These numbers are consistent with previous C IV surveys using QSO
spectra. Binning the entire dataset, we set a 95% c.l. upper limit to the
excess of C IV absorbers along GRB sightlines at twice the incidence observed
along QSO sightlines. Furthermore, the distribution of equivalent widths of the
GRB and QSO samples are consistent with being drawn from the same parent
population. Although the results for Mg II and C IV absorbers along GRB
sightlines appear to contradict one another, we note that the surveys are
nearly disjoint: the C IV survey corresponds to higher redshift and more highly
ionized gas than the Mg II survey. Nevertheless, analysis on larger statistical
samples may constrain properties of the galaxies hosting these metals (e.g.
mass, dust content) and/or the coherence-length of the gas giving rise to the
metal-line absorption.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 22:39:39 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Sep 2007 19:35:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tejos",
"Nicolas",
""
],
[
"Lopez",
"Sebastian",
""
],
[
"Prochaska",
"Jason X.",
""
],
[
"Chen",
"Hsiao-Wen",
""
],
[
"Dessauges-Zavadsky",
"Miroslava",
""
]
] |
0705.0388 | Christopher Search | Marko Zivkovic, Markku Jaaskelainen, Christopher P. Search, and Ivana
Djuric | Sagnac Rotational Phase Shifts in a Mesoscopic Electron Interferometer
with Spin-Orbit Interactions | null | null | 10.1103/PhysRevB.77.115306 | null | cond-mat.mes-hall | null | The Sagnac effect is an important phase coherent effect in optical and atom
interferometers where rotations of the interferometer with respect to an
inertial reference frame result in a shift in the interference pattern
proportional to the rotation rate. Here we analyze for the first time the
Sagnac effect in a mesoscopic semiconductor electron interferometer. We include
in our analysis Rashba spin-orbit interactions in the ring. Our results
indicate that spin-orbit interactions increase the rotation induced phase
shift. We discuss the potential experimental observability of the Sagnac phase
shift in such mesoscopic systems.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 22:58:46 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Dec 2007 01:24:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zivkovic",
"Marko",
""
],
[
"Jaaskelainen",
"Markku",
""
],
[
"Search",
"Christopher P.",
""
],
[
"Djuric",
"Ivana",
""
]
] |
0705.0389 | Michael Courtney | Michael Courtney, Amy Courtney | The Truth About Ballistic Coefficients | related to forensic science (shooting event reconstructions) | null | null | null | physics.pop-ph | null | The ballistic coefficient of a bullet describes how it slows in flight due to
air resistance. This article presents experimental determinations of ballistic
coefficients showing that the majority of bullets tested have their previously
published ballistic coefficients exaggerated from 5-25% by the bullet
manufacturers. These exaggerated ballistic coefficients lead to inaccurate
predictions of long range bullet drop, retained energy and wind drift.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 23:30:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Courtney",
"Michael",
""
],
[
"Courtney",
"Amy",
""
]
] |
0705.0390 | Arturas Vailionis | Arturas Vailionis, Wolter Siemons, and Gertjan Koster | Strain-induced single-domain growth of epitaxial SrRuO3 layers on
SrTiO3: a high-temperature x-ray diffraction study | 5 pages, 3 figures | null | 10.1063/1.2771087 | null | cond-mat.mtrl-sci | null | Temperature dependent structural phase transitions of SrRuO3 thin films
epitaxially grown on SrTiO3(001) single crystal substrates have been studied
using high-resolution x-ray diffraction. In contrast to bulk SrRuO3, coherently
strained epitaxial layers do not display cubic symmetry up to ~730 oC and
remain tetragonal. Such behavior is believed to be induced by compressive
strain between the SrRuO3 layer and SrTiO3 substrate due to lattice mismatch.
The tetragonal symmetry during growth explains the single domain growth on
miscut SrTiO3 substrates with step edges running along the [100] or [010]
direction.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 23:31:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Vailionis",
"Arturas",
""
],
[
"Siemons",
"Wolter",
""
],
[
"Koster",
"Gertjan",
""
]
] |
0705.0391 | Michael Courtney | Michael Courtney, Amy Courtney | An Acoustic Method for Determining Ballistic Coefficients | Related to forensic science (shooting event reconstruction) | null | null | null | physics.pop-ph | null | This paper presents a method for using a PC soundcard, microphone and a
chronograph to determine bullet BC with an accuracy of 6%. This is useful when
a second chronograph is unavailable or when the projectile accuracy is
insufficient to use a far chronograph.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 23:41:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Courtney",
"Michael",
""
],
[
"Courtney",
"Amy",
""
]
] |
0705.0392 | Gregory Grason | Gregory M. Grason, Robijn F. Bruinsma | Chirality and Equilibrium Biopolymer Bundles | 4 pages; 2 figures | null | 10.1103/PhysRevLett.99.098101 | null | cond-mat.soft cond-mat.mtrl-sci | null | We use continuum theory to show that chirality is a key thermodynamic control
parameter for the aggregation of biopolymers: chirality produces a stable
disperse phase of hexagonal bundles under moderately poor solvent conditions,
as has been observed in {\it in-vitro} studies of F-actin [O. Pelletier {\it et
al.}, Phys. Rev. Lett. {\bf 91}, 148102 (2003)]. The large characteristic
radius of these chiral bundles is not determined by a mysterious long-range
molecular interaction but by in-plane shear elastic stresses generated by the
interplay between a chiral torque and an unusual, but universal, non-linear
gauge term in the strain tensor of ordered chains that is imposed by rotational
invariance.
| [
{
"version": "v1",
"created": "Wed, 2 May 2007 23:46:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Grason",
"Gregory M.",
""
],
[
"Bruinsma",
"Robijn F.",
""
]
] |
0705.0393 | Meera Parish | Jingshi Hu, Meera M. Parish, T. F. Rosenbaum | Non-saturating magnetoresistance of inhomogeneous conductors: comparison
of experiment and simulation | 10 pages, 7 figures | Phys. Rev. B 75, 214203 (2007) | 10.1103/PhysRevB.75.214203 | null | cond-mat.dis-nn | null | The silver chalcogenides provide a striking example of the benefits of
imperfection. Nanothreads of excess silver cause distortions in the current
flow that yield a linear and non-saturating transverse magnetoresistance (MR).
Associated with the large and positive MR is a negative longitudinal MR. The
longitudinal MR only occurs in the three-dimensional limit and thereby permits
the determination of a characteristic length scale set by the spatial
inhomogeneity. We find that this fundamental inhomogeneity length can be as
large as ten microns. Systematic measurements of the diagonal and off-diagonal
components of the resistivity tensor in various sample geometries show clear
evidence of the distorted current paths posited in theoretical simulations. We
use a random resistor network model to fit the linear MR, and expand it from
two to three dimensions to depict current distortions in the third (thickness)
dimension. When compared directly to experiments on Ag$_{2\pm\delta}$Se and
Ag$_{2\pm\delta}$Te, in magnetic fields up to 55 T, the model identifies
conductivity fluctuations due to macroscopic inhomogeneities as the underlying
physical mechanism. It also accounts reasonably quantitatively for the various
components of the resistivity tensor observed in the experiments.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 00:08:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hu",
"Jingshi",
""
],
[
"Parish",
"Meera M.",
""
],
[
"Rosenbaum",
"T. F.",
""
]
] |
0705.0394 | V. Parameswaran Nair | Abhishek Agarwal, Dimitra Karabali and V.P. Nair | Yang-Mills Theory in 2+1 Dimensions: Coupling of Matter Fields and
String-breaking Effects | 31 pages, 1 figure, minor comments, references added, final version
to appear in Nucl.Phys.B | Nucl.Phys.B790:216-239,2008 | 10.1016/j.nuclphysb.2007.09.007 | CCNY-HEP 07/4 | hep-th | null | We explore further the Hamiltonian formulation of Yang-Mills theory in 2+1
dimensions in terms of gauge-invariant matrix variables. Coupling to scalar
matter fields is discussed in terms of gauge-invariant fields. We analyze how
the screening of adjoint (and other screenable) representations can arise in
this formalism. A Schrodinger equation is then derived for the gluelump states
which are the daughter states when an adjoint string breaks. A variational
solution of this Schrodinger equation leads to an analytic estimate of the
string-breaking energy which is within 8.8% of the latest lattice estimates.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 00:38:03 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 00:21:30 GMT"
},
{
"version": "v3",
"created": "Fri, 12 Oct 2007 21:26:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Agarwal",
"Abhishek",
""
],
[
"Karabali",
"Dimitra",
""
],
[
"Nair",
"V. P.",
""
]
] |
0705.0395 | Yimu Yin | Yimu Yin | On logical characterization of henselianity | Minor corrections | null | null | null | math.LO | null | We give some sufficient conditions under which any valued field that admits
quantifier elimination in the Macintyre language is henselian. Then, without
extra assumptions, we prove that if a valued field of characteristic $(0,0)$
has a $\Z$-group as its value group and admits quantifier elimination in the
main sort of the Denef-Pas style language $\mathcal{L}_{RRP}$ then it is
henselian. In fact the proof of this suggests that a quite large class of
Denef-Pas style languages is natural with respect to henselianity.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 01:24:33 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 17:13:09 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Yin",
"Yimu",
""
]
] |
0705.0396 | Shinji Tsujikawa | Luca Amendola, Shinji Tsujikawa | Phantom crossing, equation-of-state singularities, and local gravity
constraints in f(R) models | 8 pages, 3 figures, version to appear in Physics Letters B | Phys.Lett.B660:125-132,2008 | 10.1016/j.physletb.2007.12.041 | null | astro-ph gr-qc hep-ph hep-th | null | We identify the class of f(R) dark energy models which have a viable
cosmology, i.e. a matter dominated epoch followed by a late-time acceleration.
The deviation from a LambdaCDM model (f=R-Lambda) is quantified by the function
m=Rf_{,RR}/f_{,R}. The matter epoch corresponds to m(r=-1) simeq +0 (where
r=-Rf_{,R}/f) while the accelerated attractor exists in the region 0<m<1. We
find that the equation of state w_DE of all such ``viable'' f(R) models
exhibits two features: w_DE diverges at some redshift z_{c} and crosses the
cosmological constant boundary (``phantom crossing'') at a redshift z_{b}
smaller than z_{c}. Using the observational data of Supernova Ia and Cosmic
Microwave Background, we obtain the constraint m<O(0.1) and we find that the
phantom crossing could occur at z_{b}>1, i.e. within reach of observations. If
we add local gravity constraints, the bound on m becomes very stringent, with m
several orders of magnitude smaller than unity in the region whose density is
much larger than the present cosmological density. The representative models
that satisfy both cosmological and local gravity constraints take the
asymptotic form m(r)=C(-r-1)^p with p>1 as r approaches -1.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 01:07:47 GMT"
},
{
"version": "v2",
"created": "Fri, 11 May 2007 10:33:09 GMT"
},
{
"version": "v3",
"created": "Wed, 26 Dec 2007 04:55:47 GMT"
}
] | 2010-04-28T00:00:00 | [
[
"Amendola",
"Luca",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] |
0705.0397 | Burkhard Kampfer | M. Bluhm, B. Kampfer, R. Schulze, D. Seipt, U. Heinz | A Family of Equations of State Based on Lattice QCD: Impact on Flow in
Ultrarelativistic Heavy-Ion Collisions | null | Phys.Rev.C76:034901,2007 | 10.1103/PhysRevC.76.034901 | null | hep-ph | null | We construct a family of equations of state within a quasiparticle model by
relating pressure, energy density, baryon density and susceptibilities adjusted
to first-principles lattice QCD calculations. The relation between pressure and
energy density from lattice QCD is surprisingly insensitive to details of the
simulations. Effects from different lattice actions, quark masses and lattice
spacings used in the simulations show up mostly in the quark-hadron phase
transition region which we bridge over by a set of interpolations to a hadron
resonance gas equation of state. Within our optimized quasiparticle model we
then examine the equation of state along isentropic expansion trajectories at
small net baryon densities, as relevant for experiments and hydrodynamic
simulations at RHIC and LHC energies. We illustrate its impact on azimuthal
flow anisotropies and transverse momentum spectra of various hadron species.
| [
{
"version": "v1",
"created": "Thu, 3 May 2007 18:54:34 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 17:55:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bluhm",
"M.",
""
],
[
"Kampfer",
"B.",
""
],
[
"Schulze",
"R.",
""
],
[
"Seipt",
"D.",
""
],
[
"Heinz",
"U.",
""
]
] |
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