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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.4314 | Alberto Sicilia | Alberto Sicilia, Jeferson J. Arenzon, Alan J. Bray, Leticia F.
Cugliandolo | Domain growth morphology in curvature driven two dimensional coarsening | 27 pages, 35 figures | Phys. Rev. E 76, 061116 (2007) | 10.1103/PhysRevE.76.061116 | null | cond-mat.stat-mech | null | We study the distribution of domain areas, areas enclosed by domain
boundaries (''hulls''), and perimeters for curvature-driven two-dimensional
coarsening, employing a combination of exact analysis and numerical studies,
for various initial conditions. We show that the number of hulls per unit area,
$n_h(A,t) dA$, with enclosed area in the interval $(A,A+dA)$, is described, for
a disordered initial condition, by the scaling function $n_h(A,t) = 2c_h/(A +
\lambda_h t)^2$, where $c_h=1/8\pi\sqrt{3} \approx 0.023$ is a universal
constant and $\lambda_h$ is a material parameter. For a critical initial
condition, the same form is obtained, with the same $\lambda_h$ but with $c_h$
replaced by $c_h/2$. For the distribution of domain areas, we argue that the
corresponding scaling function has, for random initial conditions, the form
$n_d(A,t) = 2c_d (\lambda_d t)^{\tau'-2}/(A + \lambda_d t)^{\tau'}$, where
$c_d=c_h + {\cal O}(c_h^2)$, $\lambda_d=\lambda_h + {\cal O}(c_h)$, and $\tau'
= 187/91 \approx 2.055$. For critical initial conditions, one replaces $c_d$ by
$c_d/2$ (possibly with corrections of ${\cal O}(c_h^2)$) and the exponent is
$\tau = 379/187 \approx 2.027$. These results are extended to describe the
number density of the length of hulls and domain walls surrounding connected
clusters of aligned spins. These predictions are supported by extensive
numerical simulations. We also study numerically the geometric properties of
the boundaries and areas.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 19:08:55 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Nov 2007 10:55:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sicilia",
"Alberto",
""
],
[
"Arenzon",
"Jeferson J.",
""
],
[
"Bray",
"Alan J.",
""
],
[
"Cugliandolo",
"Leticia F.",
""
]
] |
0706.4315 | Hans Christianson | Hans Christianson | Cutoff Resolvent Estimates and the Semilinear Schr\"odinger Equation | 8 pages, 1 figure | null | null | null | math.AP | null | This paper shows how abstract resolvent estimates imply local smoothing for
solutions to the Schr\"odinger equation. If the resolvent estimate has a loss
when compared to the optimal, non-trapping estimate, there is a corresponding
loss in regularity in the local smoothing estimate. As an application, we apply
well-known techniques to obtain well-posedness results for the semi-linear
Schr\"odinger equation.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 20:18:32 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 21:37:18 GMT"
}
] | 2007-11-19T00:00:00 | [
[
"Christianson",
"Hans",
""
]
] |
0706.4316 | Bhuvnesh Jain | Mike Jarvis and Bhuvnesh Jain (U Penn) | On Combining Lensing Shear Information from Multiple Filters | 8 pages, no figures, submitted to JCAP | JCAP0801:003,2008 | 10.1088/1475-7516/2008/01/003 | null | astro-ph | null | We consider the possible gain in the measurement of lensing shear from
imaging data in multiple filters. Galaxy shapes may differ significantly across
filters, so that the same galaxy offers multiple samples of the shear. On the
other extreme, if galaxy shapes are identical in different filters, one can
combine them to improve the signal-to-noise and thus increase the effective
number density of faint, high redshift galaxies. We use the GOODS dataset to
test these scenarios by calculating the covariance matrix of galaxy
ellipticities in four visual filters (B,V,i,z). We find that galaxy shapes are
highly correlated, and estimate the gain in galaxy number density by combining
their shapes.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 14:53:28 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Nov 2007 20:06:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jarvis",
"Mike",
"",
"U Penn"
],
[
"Jain",
"Bhuvnesh",
"",
"U Penn"
]
] |
0706.4317 | Steven B. Kraemer | S.B. Kraemer (Catholic University), M. C. Bottorff (Southwestern
University), and D.M. Crenshaw (Georgia State University) | On the Effects of Dissipative Turbulence on the Narrow Emission-Line
Ratios in Seyfert Galaxies | 29 oages, including 10 figures. Accepted for publication in the
Astrophysical Journal | null | 10.1086/521272 | null | astro-ph | null | We present a photoionization model study of the effects of micro-turbulence
and dissipative heating on emission lines for number and column densities,
elemental abundances, and ionizations typical for the narrow emission line
regions (NLRs) of Seyfert galaxies. Earlier studies of NLR spectra generally
found good agreement between the observations and the model predictions for
most strong emission lines, such as [O III] $\lambda$5007, [O II]
$\lambda$3727, [N II] $\lambda$6583, [Ne III] $\lambda$3869, and the H and He
recombination lines. Nevertheless, the strengths of lines from species with
ionization potentials greater than that of He$^{+}$(54.4 eV), e.g. N$^{+4}$ and
Ne$^{+4}$, were often under-predicted. Among the explanations suggested for
these discrepancies were (selectively) enhanced elemental abundances and
contributions from shock heated gas. Interestingly, the NLR lines have widths
of several 100 km s$^{-1}$, well in excess of the thermal broadening. If this
is due to micro-turbulence, and the turbulence dissipates within the
emission-line gas, the gas can be heated in excess of that due to
photoionization. We show that the combined effects of turbulence and
dissipative heating can strongly enhance N V $\lambda$1240 (relative to He II
$\lambda$1640), while the heating alone can boost the strength of [Ne V]
$\lambda$3426. We suggest that this effect is present in the NLR, particularly
within $\sim$ 100 pc of the central engine. Finally, since micro-turbulence
would make clouds robust against instabilities generated during acceleration,
it is not likely to be a coincidence that the radially outflowing emission-line
gas is turbulent.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 20:37:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kraemer",
"S. B.",
"",
"Catholic University"
],
[
"Bottorff",
"M. C.",
"",
"Southwestern\n University"
],
[
"Crenshaw",
"D. M.",
"",
"Georgia State University"
]
] |
0706.4318 | Bruno Casal | B. Casal (for the CDF Collaboration) | CDF Hot Topics | Flavor Physics & CP Violation Conference, Bled, 2007 | ECONF C070512:002,2007 | null | fpcp07_113 | hep-ex | null | We present recent CDF results based on approximately 1 fb$^{-1}$ of $p\bar p$
collisions at $\sqrt s = 1.96$ TeV delivered at Fermilab Tevatron. Results
shown include the observation of the $B_s$ oscillation frequency, the first
observation of bottom baryon $\Sigma_b^{(*)\pm}$ states, updates on $B$ hadrons
lifetimes, and searches for rare decays in the $b\to s\mu^+\mu^-$ transition
and in charmless two-body B decays.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 19:36:38 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jul 2007 15:39:28 GMT"
},
{
"version": "v3",
"created": "Fri, 28 Sep 2007 22:06:11 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Casal",
"B.",
"",
"for the CDF Collaboration"
]
] |
0706.4319 | Gang Cao | G. Cao, V. Durairaj, S. Chikara, L. E. DeLong, S. Parkin, and P.
Schlottmann | Non-Fermi-liquid behavior in nearly ferromagnetic metallic SrIrO3 single
crystals | null | null | 10.1103/PhysRevB.76.100402 | null | cond-mat.str-el | null | We report transport and thermodynamic properties of single-crystal SrIrO3 as
a function of temperature T and applied magnetic field H. We find that SrIrO3
is a non-Fermi-liquid metal near a ferromagnetic instability, as characterized
by the following properties: (1) small ordered moment but no evidence for
long-range order down to 1.7 K; (2) strongly enhanced magnetic susceptibility
that diverges as T or T1/2 at low temperatures, depending on the applied field;
(3) heat capacity C(T,H) ~ -Tlog T that is readily amplified by low applied
fields; (4) a strikingly large Wilson ratio at T< 4K; and (5) a T3/2-dependence
of electrical resistivity over the range 1.7 < T < 120 K. A phase diagram based
on the data implies SrIrO3 is a rare example of a stoichiometric oxide compound
that exhibits non-Fermi-liquid behavior near a quantum critical point (T = 0
and H = 0.23 T).
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 20:51:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cao",
"G.",
""
],
[
"Durairaj",
"V.",
""
],
[
"Chikara",
"S.",
""
],
[
"DeLong",
"L. E.",
""
],
[
"Parkin",
"S.",
""
],
[
"Schlottmann",
"P.",
""
]
] |
0706.4320 | Ihor Lubashevsky | Ihor Lubashevsky, Rudolf Friedrich, Andreas Heuer | Realization of Levy flights as continuous processes | paper of 5 pages with 3 figures with added supplementary materials | null | null | null | cond-mat.stat-mech cond-mat.mtrl-sci | null | On the basis of multivariate Langevin processes we present a realization of
Levy flights as a continuous process. For the simple case of a particle moving
under the influence of friction and a velocity dependent stochastic force we
explicitly derive the generalized Langevin equation and the corresponding
generalized Fokker-Planck equation describing Levy flights. Our procedure is
similar to the treatment of the Kramers-Fokker Planck equation in the
Smoluchowski limit. The proposed approach forms a feasible way of tackling Levy
flights in inhomogeneous media or systems with boundaries what is up to now a
challenging problem.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 20:52:54 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Lubashevsky",
"Ihor",
""
],
[
"Friedrich",
"Rudolf",
""
],
[
"Heuer",
"Andreas",
""
]
] |
0706.4321 | Florencio Garcia-Santamaria | F. Garc\'ia-Santamar\'ia, Erik C. Nelson, and P. V. Braun (University
of Illinois at Urbana-Champaign) | An optical surface resonance may render photonic crystals ineffective | 6 pages, 8 figures, submitted to PRB | Physical Review B 76, 075132 (2007) | 10.1103/PhysRevB.76.075132 | null | cond-mat.mtrl-sci cond-mat.soft | null | In this work we identify and study the presence of extremely intense surface
resonances that frustrate the coupling of photons into a photonic crystal over
crucial energy ranges. The practical utility of photonic crystals demands the
capability to exchange photons with the external medium, therefore, it is
essential to understand the cause of these surface resonances and a route to
their elimination. We demonstrate that by modifying the surface geometry it is
possible to tune the optical response or eliminate the resonances to enable
full exploitation of the photonic crystal.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 21:01:33 GMT"
}
] | 2007-10-03T00:00:00 | [
[
"García-Santamaría",
"F.",
"",
"University\n of Illinois at Urbana-Champaign"
],
[
"Nelson",
"Erik C.",
"",
"University\n of Illinois at Urbana-Champaign"
],
[
"Braun",
"P. V.",
"",
"University\n of Illinois at Urbana-Champaign"
]
] |
0706.4322 | Pedro Facal San Luis | P. Facal San Luis (for the Pierre Auger Collaboration) | Measurement of the UHECR spectrum above 10 EeV at the Pierre Auger
Observatory using showers with zenith angles greater than 60 degrees | To be published in Proceedings of the 30th International Cosmic Ray
Conference (ICRC 2007), Merida, Yucatan, Mexico, 3-11 Jul 2007. 4 pages | null | null | null | astro-ph | null | We report a measurement of the cosmic ray energy spectrum obtained using the
inclined events detected with the Pierre Auger Observatory. Showers with zenith
angles between 60 and 80 degrees recorded in the period between 1 January 2004
and 28 February 2007 are analysed. Showers are first reconstructed in arrival
direction and then fitted to density maps of the muon numbers obtained from 10
EeV simulated proton showers for different arrival directions, in order to
obtain the core position and an overall normalisation factor N19 which is used
as an energy estimator. The parameter N19 is shown to be correlated with the
shower energy measured with the fluorescence technique for a sub-sample of good
quality hybrid showers. This correlation, measured with hybrid events, is then
used to determine the energy of all the showers.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 23:48:34 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Luis",
"P. Facal San",
"",
"for the Pierre Auger Collaboration"
]
] |
0706.4323 | Khalil Djelloul | Khalil Djelloul, Thi-bich-hanh Dao and Thom Fruehwirth | Theory of Finite or Infinite Trees Revisited | null | null | null | null | cs.LO cs.AI | null | We present in this paper a first-order axiomatization of an extended theory
$T$ of finite or infinite trees, built on a signature containing an infinite
set of function symbols and a relation $\fini(t)$ which enables to distinguish
between finite or infinite trees. We show that $T$ has at least one model and
prove its completeness by giving not only a decision procedure, but a full
first-order constraint solver which gives clear and explicit solutions for any
first-order constraint satisfaction problem in $T$. The solver is given in the
form of 16 rewriting rules which transform any first-order constraint $\phi$
into an equivalent disjunction $\phi$ of simple formulas such that $\phi$ is
either the formula $\true$ or the formula $\false$ or a formula having at least
one free variable, being equivalent neither to $\true$ nor to $\false$ and
where the solutions of the free variables are expressed in a clear and explicit
way. The correctness of our rules implies the completeness of $T$. We also
describe an implementation of our algorithm in CHR (Constraint Handling Rules)
and compare the performance with an implementation in C++ and that of a recent
decision procedure for decomposable theories.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 21:18:19 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Djelloul",
"Khalil",
""
],
[
"Dao",
"Thi-bich-hanh",
""
],
[
"Fruehwirth",
"Thom",
""
]
] |
0706.4324 | Karthik Shankar | Karthik Shankar, Bernard. F. Whiting | Conformal coordinates of a constant density star | 13 pages. Figure 1 in page 7 and Figure 2 in page 13 | null | null | null | gr-qc | null | It is well known that the interior of a constant density spherical star is
conformally flat. In this paper we obtain the coordinate system in which the
conformal flatness of the metric manifests itself. In a similar way, we also
construct such coordinates for Robertson Walker metric.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 22:07:23 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Shankar",
"Karthik",
""
],
[
"Whiting",
"Bernard. F.",
""
]
] |
0706.4325 | Tamas Csorgo | T. Csorgo and Sandra S. Padula | Disappearance of Squeezed Back-to-Back Correlations - a new signal of
hadron freeze-out from a supercooled Quark Gluon Plasma | 12 pages, 3 figures. Presented at 2nd Workshop on Particle
Correlation and Femtoscopy (WPCF 2006), Sao Paulo, Brazil, 9-11 Sep 2006.
Brazilian Journal of Physics (2007) in press | Braz.J.Phys.37:949-962,2007 | 10.1590/S0103-97332007000600012 | null | nucl-th | null | We briefly discuss four different possible types of transitions from quark to
hadronic matter and their characteristic signatures in terms of correlations.
We also highlight the effects arising from mass modification of hadrons in hot
and dense hadronic matter, as well as their quantum statistical consequences:
the appearance of squeezed quantum states and the associated experimental
signatures, i.e., the back-to-back correlations of particle - anti-particle
pairs. We briefly review the theoretical results of these squeezed quanta,
generated by in-medium modified masses, starting from the first indication of
the existence of surprising particle - anti-particle correlations, and ending
by considering the effects of chiral dynamics on these correlation patterns. A
prerequisite for such a signature is the experimental verification that these
theoretically predicted back-to-back correlation of particle anti-particle
pairs are, in fact, observable in high energy heavy ion reactions. Therefore,
the experimental observation of back-to-back correlations in high energy heavy
ion reactions would be a unique signature, proving the existence of in-medium
mass modification of hadronic states. On the other hand, their disappearance at
some threshold centrality or collision energy would indicate that the hadron
formation mechanism would have qualitatively changed: asymptotic hadrons above
such a threshold are not formed from medium modified hadrons anymore, but
rather by new degrees of freedom characterizing the medium. Furthermore, the
disappearance of the squeezed BBC could also serve as a signature of a sudden,
non-equilibrium hadronization scenario from a supercooled quark-gluon plasma
phase.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 21:41:54 GMT"
}
] | 2011-08-04T00:00:00 | [
[
"Csorgo",
"T.",
""
],
[
"Padula",
"Sandra S.",
""
]
] |
0706.4326 | Richard Hepworth | Richard A. Hepworth | The age grading and the Chen-Ruan cup product | 11 pages. Example added and minor errors corrected | Bull. London Math. Soc. (2010) 42(5): 868-878 | 10.1112/blms/bdq043 | CPH-SYM-00 | math.AT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the obstruction bundle used to define the cup-product in
Chen-Ruan cohomology is determined by the so-called `age grading' or
`degree-shifting numbers'. Indeed, the obstruction bundle can be directly
computed using the age grading. We obtain a Kunneth Theorem for Chen-Ruan
cohomology as a direct consequence of an elementary property of the age
grading, and explain how several other results - including associativity of the
cup-product - can be proved in a similar way.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 21:50:07 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Oct 2007 11:43:01 GMT"
},
{
"version": "v3",
"created": "Mon, 20 Oct 2008 11:03:19 GMT"
}
] | 2010-09-20T00:00:00 | [
[
"Hepworth",
"Richard A.",
""
]
] |
0706.4327 | Rodrigo Pereira | R. G. Pereira, J. Sirker, J.-S. Caux, R. Hagemans, J. M. Maillet, S.
R. White, I. Affleck | Dynamical structure factor at small q for the XXZ spin-1/2 chain | 67 pages, 25 figures | J. Stat. Mech. (2007) P08022 | 10.1088/1742-5468/2007/08/P08022 | null | cond-mat.str-el | null | We combine Bethe Ansatz and field theory methods to study the longitudinal
dynamical structure factor S^{zz}(q,omega) for the anisotropic spin-1/2 chain
in the gapless regime. Using bosonization, we derive a low energy effective
model, including the leading irrelevant operators (band curvature terms) which
account for boson decay processes. The coupling constants of the effective
model for finite anisotropy and finite magnetic field are determined exactly by
comparison with corrections to thermodynamic quantities calculated by Bethe
Ansatz. We show that a good approximation for the shape of the on-shell peak of
S^{zz}(q,omega) in the interacting case is obtained by rescaling the result for
free fermions by certain coefficients extracted from the effective Hamiltonian.
In particular, the width of the on-shell peak is argued to scale like delta
omega_{q} ~ q^2 and this prediction is shown to agree with the width of the
two-particle continuum at finite fields calculated from the Bethe Ansatz
equations. An exception to the q^2 scaling is found at finite field and large
anisotropy parameter (near the isotropic point). We also present the
calculation of the high-frequency tail of S^{zz}(q,\omega) in the region delta
omega_{q}<< omega-vq << J using finite-order perturbation theory in the band
curvature terms. Both the width of the on-shell peak and the high-frequency
tail are compared with S^{zz}(q,omega) calculated by Bethe Ansatz for finite
chains using determinant expressions for the form factors and excellent
agreement is obtained. Finally, the accuracy of the form factors is checked
against the exact first moment sum rule and the static structure factor
calculated by Density Matrix Renormalization Group (DMRG).
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 23:42:59 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 23:47:34 GMT"
},
{
"version": "v3",
"created": "Fri, 10 Aug 2007 17:42:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pereira",
"R. G.",
""
],
[
"Sirker",
"J.",
""
],
[
"Caux",
"J. -S.",
""
],
[
"Hagemans",
"R.",
""
],
[
"Maillet",
"J. M.",
""
],
[
"White",
"S. R.",
""
],
[
"Affleck",
"I.",
""
]
] |
0706.4328 | Mathieu Segond | M. Segond | QCD factorizations in gamma* gamma* --> rho_L^0 rho_L^0 | Presented at DIS 2007: 15th International Workshop on Deep-Inelastic
Scattering, Munich, Germany, 16-20 Apr 2007, 4 pages, 6 figures, LATEX | null | null | null | hep-ph | null | The exclusive reaction of rho meson pair electroproduction in gamma*gamma*
collisions is a nice place to study various dynamics and factorization
properties in the perturbative sector of QCD. At low energy (quarks dominance),
this process can be considered as a way to explore QCD factorizations involving
generalized distribution amplitudes (GDA) and transition distribution
amplitudes (TDA), and, in the Regge limit of QCD (gluons dominance), it seems
to offer a promising probe of the BFKL resummation effects which could be
studied at the next international linear collider (ILC).
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 13:05:01 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Segond",
"M.",
""
]
] |
0706.4329 | Nikolai V. Mitskievich | Vladimir N. Efremov, Nikolai V. Mitskievich and Alfonso M. Hern\'andez
Magdaleno | BF systems on graph cobordisms as topological cosmology | 44 pages | null | null | null | gr-qc | null | A cosmological model connecting the evolution of universe with a sequence of
topology changes described by a collection of specific graph cobordisms, is
constructed. It is shown that an adequate topological field theory (of BF-type)
can be put into relation to each graph cobordism. The explicit expressions for
transition amplitudes (partition functions) are written in these BF-models and
it is shown that the basic topological invariants of the graph cobordisms
(intersection matrices) play the r{\^o}le of coupling constants between the
formal analogues of electric and magnetic fluxes quantized {\`a} la Dirac, but
with the use of Poicar{\'e}--Lefschetz duality. For a specific graph cobordism,
the diagonal elements and eigenvalues of the intersection matrix reproduce the
hierarchy of dimensionless low-energy coupling constants of the fundamental
interactions acting in the real universe.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 22:02:22 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Efremov",
"Vladimir N.",
""
],
[
"Mitskievich",
"Nikolai V.",
""
],
[
"Magdaleno",
"Alfonso M. Hernández",
""
]
] |
0706.4330 | Debra Shepherd | D. S. Shepherd, M. S. Povich, B. A. Whitney, T. P. Robitaille, D. E.
A. Nurnberger, L. Bronfman, D. P. Stark, R. Indebetouw, M. R. Meade, B. L.
Babler | Molecular Outflows and a Mid-Infrared Census of the Massive
Star-Formation Region Associated with IRAS 18507+0121 | Accepted by ApJ, 46 pages, 12 figures | Astrophys.J.669:464-482,2007 | 10.1086/521331 | null | astro-ph | null | We have observed the central region of the IR-dark cloud filament associated
with IRAS 18507+0121 at millimeter wavelengths in CO(1-0), 13CO(1-0), and
C18O(1-0) line emission and with the Spitzer Space Telescope at mid-IR
wavelengths. Five massive outflows from two cloud cores were discovered. Three
outflows are centered on or near an Ultracompact HII region (G34.4+0.23) while
the remaining two outflows originate from the millimeter core G34.4+0.23 MM.
Modeling of the SEDs of the mid-IR sources identified 31 young stellar objects
in the filament with a combined stellar mass of ~127 +/- 27 Msun. An additional
22 sources were identified as probable cluster members based on the presence of
strong 24 micron emission. The total star formation efficiency in the G34.4
cloud filament is estimated to be ~7% while the massive and intermediate mass
star formation efficiency in the entire cloud filament is estimated to be
roughly 2%. A comparison of the gravitational binding energy with the outflow
kinetic energy suggests that the compact core containing G34.4+0.23 MM is being
destroyed by its molecular outflows whereas the outflows associated with more
massive core surrounding the G34.4 UC HII region are not likely to totally
disrupt the cloud. Additionally, a qualitative evaluation of the region appears
to suggest that stars in this region may have formed in two stages: first lower
mass stars formed and then, a few Myrs later, the more massive stars began to
form.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 22:08:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Shepherd",
"D. S.",
""
],
[
"Povich",
"M. S.",
""
],
[
"Whitney",
"B. A.",
""
],
[
"Robitaille",
"T. P.",
""
],
[
"Nurnberger",
"D. E. A.",
""
],
[
"Bronfman",
"L.",
""
],
[
"Stark",
"D. P.",
""
],
[
"Indebetouw",
"R.",
""
],
[
"Meade",
"M. R.",
""
],
[
"Babler",
"B. L.",
""
]
] |
0706.4331 | Eric Nielsen | Eric L. Nielsen (1), Laird M. Close (1), Beth A. Biller (1), Elena
Masciadri (2), and Rainer Lenzen (3) ((1) Steward Observatory, University of
Arizona, (2) INAF-Osservatorio Astrofisico di Arcetri, Italy, (3)
Max-Planck-Institut fur Astronomie, Hiedelberg, Germany) | Constraints on Extrasolar Planet Populations from VLT NACO/SDI and MMT
SDI and Direct Adaptive Optics Imaging Surveys: Giant Planets are Rare at
Large Separations | 46 pages, 17 figures, accepted to ApJ | null | 10.1086/524344 | null | astro-ph | null | We examine the implications for the distribution of extrasolar planets based
on the null results from two of the largest direct imaging surveys published to
date. Combining the measured contrast curves from 22 of the stars observed with
the VLT NACO adaptive optics system by Masciadri et al. (2005), and 48 of the
stars observed with the VLT NACO SDI and MMT SDI devices by Biller et al.
(2007) (for a total of 60 unique stars; the median star for our survey is a 30
Myr K2 star at 25 pc), we consider what distributions of planet masses and
semi-major axes can be ruled out by these data, based on Monte Carlo
simulations of planet populations. We can set this upper limit with 95%
confidence: the fraction of stars with planets with semi-major axis from 20 to
100 AU, and mass >4 M_Jup, is 20% or less. Also, with a distribution of planet
mass of dN/dM ~ M^-1.16 between 0.5-13 M_Jup, we can rule out a power-law
distribution for semi-major axis (dN/da ~ a^alpha) with index 0 and upper
cut-off of 18 AU, and index -0.5 with an upper cut-off of 48 AU. For the
distribution suggested by Cumming et al. (2007), a power-law of index -0.61, we
can place an upper limit of 75 AU on the semi-major axis distribution. At the
68% confidence level, these upper limits state that fewer than 8% of stars have
a planet of mass >4 M_Jup between 20 and 100 AU, and a power-law distribution
for semi-major axis with index 0, -0.5, and -0.61 cannot have giant planets
beyond 12, 23, and 29 AU, respectively. In general, we find that even null
results from direct imaging surveys are very powerful in constraining the
distributions of giant planets (0.5-13 M_Jup) at large separations, but more
work needs to be done to close the gap between planets that can be detected by
direct imaging, and those to which the radial velocity method is sensitive.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 22:08:04 GMT"
},
{
"version": "v2",
"created": "Sun, 1 Jul 2007 11:23:24 GMT"
},
{
"version": "v3",
"created": "Wed, 10 Oct 2007 01:24:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nielsen",
"Eric L.",
""
],
[
"Close",
"Laird M.",
""
],
[
"Biller",
"Beth A.",
""
],
[
"Masciadri",
"Elena",
""
],
[
"Lenzen",
"Rainer",
""
]
] |
0706.4332 | Igor Ivanov | I. P. Ivanov | Can 2HDM support fermion-stabilized bubbles of false vacuum? | 6 pages, 1 figure | null | null | null | hep-ph | null | The Higgs potential of the two-Higgs-doublet model can have several minima
with different properties. We discuss a possibility that a heavy fermion, if
trapped in a microscopic false vacuum bubble, might become light enough to
prevent the bubble from the collapse.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 22:20:38 GMT"
},
{
"version": "v2",
"created": "Sun, 1 Jul 2007 19:11:53 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Ivanov",
"I. P.",
""
]
] |
0706.4333 | Avner Peleg | Avner Peleg | Energy exchange in fast optical soliton collisions as a random cascade
model | Revised version, 12 pages, 2 figures. Accepted to Phys. Lett. A | null | null | null | nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of a probe soliton propagating in an optical fiber and
exchanging energy in fast collisions with a random sequence of pump solitons.
The energy exchange is induced by Raman scattering or by cubic nonlinear
loss/gain. We show that the equation describing the dynamics of the probe
soliton's amplitude has the same form as the equation for the local space
average of energy dissipation in random cascade models in turbulence. We
characterize the statistics of the probe soliton's amplitude by the \tau_{q}
exponents from multifractal theory and by the Cram\'er function S(x). We find
that the n-th moment of the two-time correlation function and the
bit-error-rate contribution from amplitude decay exhibit power-law behavior as
functions of propagation distance, where the exponents can be expressed in
terms of \tau_{q} or S(x).
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 23:04:21 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Jun 2009 15:25:10 GMT"
}
] | 2009-06-01T00:00:00 | [
[
"Peleg",
"Avner",
""
]
] |
0706.4334 | Khosrow Fazli | Khosrow Fazli | Power Loss for Inhomogeneous Poisson Processes | 20 pages | null | null | null | math.ST stat.TH | null | In this work, based on a realization of an inhomogeneous Poisson process
whose intensity function depends on a real unknown parameter, we consider a
simple hypothesis against a sequence of close (contiguous) alternatives. Under
certain regularity conditions we obtain the power loss of the score test with
respect to the Neyman-Pearson test. The power loss measures the performance of
a second order efficient test by the help of third order asymptotic properties
of the problem under consideration.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 23:21:59 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Fazli",
"Khosrow",
""
]
] |
0706.4335 | Darrick E. Chang | D.E. Chang, A.S. S{\o}rensen, E.A. Demler, and M.D. Lukin | A single-photon transistor using nano-scale surface plasmons | 20 pages, 4 figures | null | 10.1038/nphys708 | null | quant-ph | null | It is well known that light quanta (photons) can interact with each other in
nonlinear media, much like massive particles do, but in practice these
interactions are usually very weak. Here we describe a novel approach to
realize strong nonlinear interactions at the single-photon level. Our method
makes use of recently demonstrated efficient coupling between individual
optical emitters and tightly confined, propagating surface plasmon excitations
on conducting nanowires. We show that this system can act as a nonlinear
two-photon switch for incident photons propagating along the nanowire, which
can be coherently controlled using quantum optical techniques. As a novel
application, we discuss how the interaction can be tailored to create a
single-photon transistor, where the presence or absence of a single incident
photon in a ``gate'' field is sufficient to completely control the propagation
of subsequent ``signal'' photons.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 23:36:55 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Chang",
"D. E.",
""
],
[
"Sørensen",
"A. S.",
""
],
[
"Demler",
"E. A.",
""
],
[
"Lukin",
"M. D.",
""
]
] |
0706.4336 | Doron Chelouche | Doron Chelouche, Brice M\'enard, David V. Bowen, Orly Gnat | On the Connection Between Metal Absorbers and Quasar Nebulae | 15 pages, 13 figures (ApJ submitted) | null | 10.1086/588836 | null | astro-ph | null | We establish a simple model for the distribution of cold gas around L*
galaxies using a large set of observational constraints on the properties of
strong MgII absorber systems. Our analysis suggests that the halos of L*
galaxies are filled with cool gaseous clouds having sizes of order 1kpc and
densities of ~10^{-2} cm^{-3}. We then investigate the physical effects of
cloud irradiation by a quasar and study the resulting spectral signatures. We
show that quasar activity gives rise to (i) extended narrow-line emission on
~100kpc scales and (ii) an anisotropy in the properties of the absorbing gas
arising from the geometry of the quasar radiation field. Provided that quasars
reside in halos several times more massive than those of L* galaxies, our model
predictions appear to be in agreement with observations of narrow emission-line
nebulae around quasars and the recent detections of ~100kpc cold gaseous
envelopes around those objects, suggesting a common origin for these phenomena.
We discuss the implications of our results for understanding absorption
systems, probing quasar environments at high redshifts, and testing the quasar
unification scheme.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 23:37:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chelouche",
"Doron",
""
],
[
"Ménard",
"Brice",
""
],
[
"Bowen",
"David V.",
""
],
[
"Gnat",
"Orly",
""
]
] |
0706.4337 | Thomas Prellberg | E J Janse van Rensburg, T Prellberg, A Rechnitzer | Directed Paths in a Wedge | null | null | 10.1088/1751-8113/40/47/003 | null | cond-mat.soft cond-mat.stat-mech math-ph math.CO math.MP | null | Directed paths have been used extensively in the scientific literature as a
model of a linear polymer. Such paths models in particular the conformational
entropy of a linear polymer and the effects it has on the free energy. These
directed models are simplified versions of the self-avoiding walk, but they do
nevertheless give insight into the phase behaviour of a polymer, and also serve
as a tool to study the effects of conformational degrees of freedom in the
behaviour of a linear polymer. In this paper we examine a directed path model
of a linear polymer in a confining geometry (a wedge). The main focus of our
attention is $c_n$, the number of directed lattice paths of length $n$ steps
which takes steps in the North-East and South-East directions and which is
confined to the wedge $Y=\pm X/p$, where $p$ is an integer. In this paper we
examine the case $p=2$ in detail, and we determine the generating function
using the iterated kernel method. We also examine the asymtotics of $c_n$. In
particular, we show that $$ c_n = [0.67874...]\times 2^{n-1}(1+(-1)^n) +
O((4/3^{3/4})^{n+o(n)}) + o((4/3^{3/4})^n) $$ where we can determine the
constant $0.67874...$ to arbitrary accuracy with little effort.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 23:50:46 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"van Rensburg",
"E J Janse",
""
],
[
"Prellberg",
"T",
""
],
[
"Rechnitzer",
"A",
""
]
] |
0706.4338 | Morgan Sherman | Morgan Sherman | Convergence properties of Donaldson's $T$-iterations on the Riemann
sphere | 17 pages, 2 figures. The version uses a more natural notion of
distance on the space of hermitian metrics, and includes investigations in
the case of $\mathbb{CP}^n$ | null | null | null | math.DG math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper Donaldson defines three operators on a space of Hermitian
metrics on a complex projective manifold: $T, T_{\nu}, T_K.$ Iterations of
these operators converge to balanced metrics, and these themselves approximate
constant scalar curvature metrics. In this paper we investigate the convergence
properties of these iterations by examining the case of the Riemann sphere as
well as higher dimensional $\mathbb{CP}^n$.
| [
{
"version": "v1",
"created": "Thu, 28 Jun 2007 23:58:24 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Aug 2008 01:15:56 GMT"
}
] | 2008-08-25T00:00:00 | [
[
"Sherman",
"Morgan",
""
]
] |
0706.4339 | Xiao-Gang Wen | Bas J. Overbosch, Xiao-Gang Wen | Dynamical and scaling properties of nu=5/2 interferometer | 6 pages. RevTeX4 | null | null | null | cond-mat.mes-hall cond-mat.str-el | null | We calculate the non-linear I-V tunneling curves for a two-point-contact
tunneling junction between two edges of the $\nu={5/2}$ non-abelian fractional
quantum Hall state. The non-linear I-V tunneling curves are calculated for both
cases with and without an $e/4$ non-abelian quasiparticle between the two
contacts. We confirm that, within a dynamical edge theory, the presence of the
$e/4$ quasiparticle between the two contacts destroys the interference between
the two tunneling paths. We also calculate how the interference reappears as
the $e/4$ quasiparticle is moved closer to an edge.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 00:45:13 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Overbosch",
"Bas J.",
""
],
[
"Wen",
"Xiao-Gang",
""
]
] |
0706.4340 | Yunfeng Xiao | Yun-Feng Xiao, Xu-Bo Zou, Wei Jiang, You-Ling Chen, and Guang-Can Guo | Analogue to multiple electromagnetically induced transparency in
all-optical drop-filter systems | 4 pages, 4 figures | PHYSICAL REVIEW A 75, 063833 (2007) | 10.1103/PhysRevA.75.063833 | null | quant-ph | null | We theoretically study a parallel optical configuration which includes N
periodically coupled whispering-gallery-mode resonators. The model shows an
obvious effect which has a direct analogy with the phenomenon of multiple
electromagnetically induced transparency in quantum systems. The numerical
simulations illuminate that the frequency transparency windows are sharp and
highly transparent. We also briefly discuss the experimental feasibility of the
current scheme in two practical systems, microrings and microdisks.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 01:14:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Xiao",
"Yun-Feng",
""
],
[
"Zou",
"Xu-Bo",
""
],
[
"Jiang",
"Wei",
""
],
[
"Chen",
"You-Ling",
""
],
[
"Guo",
"Guang-Can",
""
]
] |
0706.4341 | Taekyun Kim | Taekyun Kim | A note on p-adic q-integrals associated with q-Euler numbers | 5 pages | null | null | null | math.NT | null | In this we give a detailed proof of fermionic p-adic q-measures on Z_p and we
will treat some interesting formulae related q-extension of Euler numbers and
polynomials.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 01:16:46 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Kim",
"Taekyun",
""
]
] |
0706.4342 | Alexei Tsvelik | A. V. Chubukov and A. M. Tsvelik | Spin-liquid model of the sharp resistivity drop in
$La_{1.85}Ba_{0.125}CuO_4$ | 4 pages, 2 figures | null | 10.1103/PhysRevB.76.100509 | null | cond-mat.supr-con | null | We use the phenomenological model proposed in our previous paper [Phys. Rev.
Lett. {\bf 98}, 237001 (2007)] to analyse the magnetic field dependence of the
onset temperature for two-dimensional fluctuating superconductivity $T^{**}
(H)$. We demonstrate that the slope of $T^{**} (H)$ progressively goes down as
$H$ increases, such that the upper critical field progressively increases as
$T$ decreases. The quantitative agreement with the recent measurements of
$T^{**} (H)$ in $La_{1.85}Ba_{0.125}CuO_4$ is achieved for the same parameter
value as was derived in our previous publication from the analysis of the
electron self energy.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 01:27:50 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 17:30:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chubukov",
"A. V.",
""
],
[
"Tsvelik",
"A. M.",
""
]
] |
0706.4343 | Qinghe Yin | Qinghe Yin | Hausdorff Dimension and Hausdorff Measure for Non-integer based
Cantor-type Sets | null | null | null | null | math.DS math.MG | null | We consider digits-deleted sets or Cantor-type sets with $\beta$-expansions.
We calculate the Hausdorff dimension $d$ of these sets and show that $d$ is
continuous with respect to $\beta$. The $d$-dimentional Hausdorff measure of
these sets is finite and positive.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 01:44:49 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Yin",
"Qinghe",
""
]
] |
0706.4344 | Robert Rhoades | Robert C. Rhoades | 2-Selmer Groups and the Birch-Swinnerton-Dyer Conjecture for the
Congruent Number Curve | 14 pages | null | null | null | math.NT | null | We take an approach toward counting the number of n for which the curves E_n:
y^2=x^3-n^2x have 2-Selmer groups of a given size. This question was also
discussed in a pair of Invent. Math. papers by Roger Heath-Brown. We discuss
the connection between computing the size of these Selmer groups and verifying
cases of the Birch and Swinnerton-Dyer Conjecture. The key ingredient for the
asymptotic formulae is the ``independence'' of the Legendre symbol evaluated at
the prime divisors of an integer with exactly k prime factors.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 01:48:26 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Rhoades",
"Robert C.",
""
]
] |
0706.4345 | Thomas Dahm | Thomas Dahm and Kazuo Ueda | NMR relaxation and resistivity from rattling phonons in pyrochlore
superconductors | 4 pages, 4 figures; new version with some minor additional
clarifications; accepted for publication in Phys. Rev. Lett | Phys. Rev. Lett. 99, 187003 (2007) | 10.1103/PhysRevLett.99.187003 | null | cond-mat.supr-con cond-mat.mtrl-sci | null | We calculate the temperature dependence of NMR relaxation rate and electrical
resistivity for coupling to a local, strongly anharmonic phonon mode. We argue
that the two-phonon Raman process is dominating NMR relaxation. Due to the
strong anharmonicity of the phonon an unusual temperature dependence is found
having a low temperature peak and becoming constant towards higher
temperatures. The electrical resistivity is found to vary like T^2 at low
temperatures and following a sqrt{T} behavior at high temperatures. Both
results are in qualitative agreement with recent observations on
beta-pyrochlore oxide superconductors.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 02:22:15 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Sep 2007 10:24:10 GMT"
}
] | 2007-10-30T00:00:00 | [
[
"Dahm",
"Thomas",
""
],
[
"Ueda",
"Kazuo",
""
]
] |
0706.4346 | Zenro Hioki | Zenro Hioki, Takuya Konishi, Kazumasa Ohkuma | Studying possible CP-violating Higgs couplings through top-quark pair
productions at muon colliders | Final version (to appear in JHEP) | JHEP 0707:082,2007 | 10.1088/1126-6708/2007/07/082 | FUT-07-02 | hep-ph hep-ex | null | We study possible anomalous CP-violating Higgs couplings to mu mu-bar and t
t-bar fully model-independent way through top-quark pair productions at muon
colliders. Assuming additional non-standard neutral Higgs bosons, whose
couplings with top-quark and muon are expressed in the most general covariant
form, we carry out analyses of effects which they are expected to produce via
CP-violating asymmetries and also the optimal-observable (OO) procedure under
longitudinal and transverse muon polarizations. We find the measurement of the
asymmetry for longitudinal beam polarization could be useful to catch some
signal of CP violation, and an OO analysis might also be useful if we could
reduce the number of unknown parameters with a help of other experiments and if
the size of the parameters is at least O(1) ~ O(10).
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 02:58:40 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 00:11:16 GMT"
}
] | 2011-01-13T00:00:00 | [
[
"Hioki",
"Zenro",
""
],
[
"Konishi",
"Takuya",
""
],
[
"Ohkuma",
"Kazumasa",
""
]
] |
0706.4347 | Luis Ho | Luis C. Ho (The Observatories of the Carnegie Institution of
Washington) | Bulge and Halo Kinematics Across the Hubble Sequence | 17 pages. To appear in ApJ | null | 10.1086/521270 | null | astro-ph | null | The correlation between the maximum rotational velocity of the disk (v_m) and
the central stellar velocity dispersion of the bulge (sigma) offers insights
into the relationship between the halo and the bulge. We have assembled
integrated H I line widths and central stellar velocity dispersions to study
the v_m-sigma relation for 792 galaxies spanning a broad range of Hubble types.
Contrary to earlier studies based on much smaller samples, we find that the
v_m-sigma relation exhibits significant intrinsic scatter and that its
zeropoint varies systematically with galaxy morphology, bulge-to-disk ratio,
and light concentration, as expected from basic dynamical considerations.
Nucleated but bulgeless late-type spiral galaxies depart significantly from the
v_m-sigma relation. While these results render questionable any attempt to
supplant the bulge with the halo as the fundamental determinant of the central
black hole mass in galaxies, the observed distribution of v_m/sigma, which
depends on both the density profile and kinematic structure of the galaxy,
offers a useful constraint on galaxy formation models. With the aid of a
near-infrared Tully-Fisher relation, we identify a population of otherwise
normal, luminous galaxies that have exceptionally low values of v_m/sigma. We
argue that a significant fraction of the H I gas in these kinematically
anomalous objects is dynamically unrelaxed, having been acquired externally
either through capture from tidal interactions or through cold accretion from
the intergalactic medium.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 03:12:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ho",
"Luis C.",
"",
"The Observatories of the Carnegie Institution of\n Washington"
]
] |
0706.4348 | Per-Gunnar Martinsson | Per-Gunnar Martinsson | A fast direct solver for network matrices | 11 pages, 6 figures | null | null | null | math.NA | null | A fast direct inversion scheme for the large sparse systems of linear
equations resulting from the discretization of elliptic partial differential
equations in two dimensions is given. The scheme is described for the
particular case of a discretization on a uniform square grid, but can be
generalized to more general geometries. For a grid containing $N$ points, the
scheme requires $O(N \log^{2}N)$ arithmetic operations and $O(N \log N)$
storage to compute an approximate inverse. If only a single solve is required,
then the scheme requires only $O(\sqrt{N} \log N)$ storage; the same storage is
sufficient for computing the Dirichlet-to-Neumann operator as well as other
boundary-to-boundary operators. The scheme is illustrated with several
numerical examples. For instance, a matrix of size $10^6 \times 10^6$ is
inverted to seven digits accuracy in four minutes on a 2.8GHz P4 desktop PC.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 03:16:46 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Martinsson",
"Per-Gunnar",
""
]
] |
0706.4349 | Yg Kim | Hiroyuki Abe, Yeong Gyun Kim, Tatsuo Kobayashi, Yasuhiro Shimizu | TeV scale partial mirage unification and neutralino dark matter | null | JHEP0709:107,2007 | 10.1088/1126-6708/2007/09/107 | null | hep-ph | null | We study the TeV scale partial mirage unification scenario, where the gluino
and wino masses are degenerate around a TeV scale, but the bino mass is not
degenerate. This scenario has phenomenologically interesting aspects. First,
because of the degeneracy between the gluino and wino masses, this scenario
does not have the little hierarchy problem, that is, the higgisino mass is
around 150 GeV. The lightest superparticle is a mixture of the bino and
higgsino, and can lead to a right amount of thermal relic density as a dark
matter candidate.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 03:43:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Abe",
"Hiroyuki",
""
],
[
"Kim",
"Yeong Gyun",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Shimizu",
"Yasuhiro",
""
]
] |
0706.4350 | Boris Klain | A. Yu. Kurazhkovskii, N. A. Kurazhkovskaya, and B. I. Klain | On Interdependence of the Paleomagnetic Field Characteristics | 13 pages, 3 figures | null | null | null | physics.geo-ph | null | The behaviour of the geomagnetic field characteristics (mean values of the
paleointensity, amplitude of its variations and reversal frequency) during the
last 170 million years was analyzed. It was found that the mean values of the
paleointensity were in direct relation to amplitude of its variations and in
reverse relation to reversal frequency. The most considerable changes of the
Earth magnetic field characteristics occurred in Early Cretaceous, Middle
Paleogene and Neogene. The analysis of conformity of the reconstructed
characteristics behaviour of a geomagnetic field to an alfa-omega- dynamo model
was made.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:29:13 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Kurazhkovskii",
"A. Yu.",
""
],
[
"Kurazhkovskaya",
"N. A.",
""
],
[
"Klain",
"B. I.",
""
]
] |
0706.4351 | Anna Yuen Lam Wong | K. S. Cheng, D. O. Chernyshov and V. A. Dogiel | Diffuse Gamma-ray Emission from the Galactic Center - A Multiple Energy
Injection Model | 8 pages, 3 figures, accepted by A&A | null | 10.1051/0004-6361:20077538 | null | astro-ph | null | We suggest that the energy source of the observed diffuse gamma-ray emission
from the direction of the Galactic center is the Galactic black hole Sgr A*,
which becomes active when a star is captured at a rate of $\sim 10^{-5} $
yr^{-1}. Subsequently the star is tidally disrupted and its matter is accreted
into the black hole. During the active phase relativistic protons with a
characteristic energy $\sim 6\times 10^{52}$ erg per capture are ejected. Over
90% of these relativistic protons disappear due to proton-proton collisions on
a timescale $\tau_{pp} \sim 10^4$ years in the small central bulge region with
radius $\sim 50$ pc within Sgr A*, where the density is $\ge 10^3$ cm^{-3}. The
gamma-ray intensity, which results from the decay of neutral pions produced by
proton-proton collisions, decreases according to $e^{-t/\tau_{pp}}$, where t is
the time after last stellar capture. Less than 5% of relativistic protons
escaped from the central bulge region can survive and maintain their energy for
>10^7 years due to much lower gas density outside, where the gas density can
drop to $\sim 1$ cm$^{-3}$. They can diffuse to a $\sim 500$ pc region before
disappearing due to proton-proton collisions. The observed diffuse GeV
gamma-rays resulting from the decay of neutral pions produced via collision
between these escaped protons and the gas in this region is expected to be
insensitive to time in the multi-injection model with the characteristic
injection rate of 10^{-5} yr^{-1}. Our model calculated GeV and 511 keV
gamma-ray intensities are consistent with the observed results of EGRET and
INTEGRAL, however, our calculated inflight annihilation rate cannot produce
sufficient intensity to explain the COMPTEL data.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 04:36:54 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 03:00:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cheng",
"K. S.",
""
],
[
"Chernyshov",
"D. O.",
""
],
[
"Dogiel",
"V. A.",
""
]
] |
0706.4352 | Mukul Laad S | M.S. Laad and L. Craco | Orbital Order, Stripe Phases and Mott Transition in a Planar Model for
Manganites | 4 pages, 3 figures | null | null | null | cond-mat.str-el cond-mat.mtrl-sci | null | Understanding orbital ordered (OO) Mott insulating states lies at the heart
of a consistent resolution of the colossal magneto-resistance (CMR) observed in
manganites, where its melting induces a low-$T$ insulator-metal transition for
$0.25 \le x\le 0.45$. Motivated thereby, we study the OO states in a planar
model for bilayer manganites using DMFT and finite-size diagonalisation
methods. We derive the correct OO ground states observed in manganites for
$x=0,{1/2},{2/3},{3/4}$ in exact agreement with observations, including the
charge-orbital-magnetic ordered stripe phases for $x>{1/2}$. These OO states
are {\it exactly} shown to be associated with an ``alloy'' ordering of the
$d_{3x^{2}-r^{2}}/d_{3y^{2}-r^{2}}$ orbitals on each $Mn^{3+}$ site.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 05:16:04 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Laad",
"M. S.",
""
],
[
"Craco",
"L.",
""
]
] |
0706.4353 | Juergen Hausen | Ivan V. Arzhantsev, Juergen Hausen | Geometric Invariant Theory via Cox Rings | 27 pages, minor changes, Example 8.8 replaced, to appear in Journal
of Pure and Applied Algebra | J. Pure Appl. Algebra 213, 154-172 (2009) | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider actions of reductive groups on a varieties with finitely
generated Cox ring, e.g., the classical case of a diagonal action on a product
of projective spaces. Given such an action, we construct via combinatorial data
in the Cox ring all maximal open subsets such that the quotient is
quasiprojective or embeddable into a toric variety. As applications, we obtain
an explicit description of the chamber structure of the linearized ample cone
and several Gelfand-MacPherson type correspondences relating quotients of
reductive groups to quotients of torus actions. Moreover, our approach provides
information on the geometry of many of the resulting quotient spaces.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 13:08:28 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jun 2008 10:28:19 GMT"
}
] | 2008-12-19T00:00:00 | [
[
"Arzhantsev",
"Ivan V.",
""
],
[
"Hausen",
"Juergen",
""
]
] |
0706.4354 | Takao Yamazaki | Michael Spiess, Takao Yamazaki | A counterexample to generalizations of the Milnor-Bloch-Kato conjecture | 13 pages, The previous version was entitled `A counterexample to a
conjecture of Somekawa' | null | null | null | math.KT | null | We construct an example of a torus $T$ over a field $K$ for which the Galois
symbol $K(K; T,T)/n K(K; T,T) \to H^2(K, T[n]\otimes T[n])$ is not injective
for some $n$. Here $K(K; T,T)$ is the Milnor $K$-group attached to $T$
introduced by Somekawa. We show also that the motive $M(T\times T)$ gives a
counterexample to another generalization of the Milnor-Bloch-Kato conjecture
(proposed by Beilinson).
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 06:10:55 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Sep 2007 05:58:57 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Spiess",
"Michael",
""
],
[
"Yamazaki",
"Takao",
""
]
] |
0706.4355 | Arun Kenath Mr | C. Sivaram (1), Kenath Arun (2), Samartha C A (3) ((1) Indian
Institute of Astrophysics, (2) Christ Junior College, (3) Indian Institute of
Science) | Phase Space Constraints on Neutrino Luminosities | 13 pages, 20 equations | Mod.Phys.Lett.A23:1470-1477,2008 | 10.1142/S0217732308027850 | null | astro-ph | null | While the importance of phase space constraints for gravitational clustering
of neutrinos (which are fermions) is well recognized, the explicit use of such
constraints to limit neutrino emission from ultra energetic sources has not
been stressed. Special and general relativistic phase space constraints are
shown to limit neutrino luminosities in compact sources in various situations.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 06:15:19 GMT"
}
] | 2010-03-26T00:00:00 | [
[
"Sivaram",
"C.",
""
],
[
"Arun",
"Kenath",
""
],
[
"A",
"Samartha C",
""
]
] |
0706.4356 | Pekka Alitalo | Pekka Alitalo, Olli Luukkonen, Sergei Tretyakov | A three-dimensional backward-wave network matched with free space | 8 pages, 5 figures | Physics Letters A, vol. 372, pp. 2720-2723, 2008. | 10.1016/j.physleta.2007.12.043 | null | physics.gen-ph physics.optics | null | A backward-wave slab based on a capacitively and inductively loaded
three-dimensional transmission-line network is designed in such a way that
impedance-matching with free space is obtained. To enable field propagation
from free space to the network and vice versa, the use of a transition layer is
proposed. Matching of the designed network with free space and negative
refraction occurring at the slab interfaces are confirmed with full-wave
simulations.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 06:32:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alitalo",
"Pekka",
""
],
[
"Luukkonen",
"Olli",
""
],
[
"Tretyakov",
"Sergei",
""
]
] |
0706.4357 | Ramesh Chandra | S. Singh, R. Chandra, P. K. Rath, P. K. Raina and J. G. Hirsch | Nuclear deformation and the two neutrino double-\beta decay in
^{124,126}Xe,^{128,130}Te, ^{130,132}Ba and ^{150}Nd isotopes | 19 pages | Eur.Phys.J.A33:375-388,2007 | 10.1140/epja/i2007-10481-7 | null | nucl-th | null | The two neutrino double beta decay of $^{124,126}$Xe,$^{128,130}$Te, $
^{130,132}$Ba and $^{150}$Nd isotopes is studied in the Projected
Hartree-Fock-Bogoliubov (PHFB) model. Theoretical 2$\nu $ $\beta^{-}\beta ^{-}$
half-lives of $^{128,130}$Te, and $^{150}$Nd isotopes, and 2$\nu
\beta^{+}\beta^{+}$, 2$\nu $ $\beta^{+}EC$ and 2$\nu $ $ECEC$ for $
^{124,126}$Xe and $^{130,132}$Ba nuclei are presented. Calculated quadrupolar
transition probabilities B(E2: $0^+\to 2^+$), static quadrupole moments and $g$
factors in the parent and daughter nuclei reproduce the experimental
information, validating the reliability of the model wave functions. The
anticorrelation between nuclear deformation and the nuclear transition matrix
element $M_{2\nu} $ is confirmed.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 07:09:41 GMT"
},
{
"version": "v2",
"created": "Sun, 23 Sep 2007 14:21:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Singh",
"S.",
""
],
[
"Chandra",
"R.",
""
],
[
"Rath",
"P. K.",
""
],
[
"Raina",
"P. K.",
""
],
[
"Hirsch",
"J. G.",
""
]
] |
0706.4358 | Fabio Tonoli | Roberto Pignatelli and Fabio Tonoli | On Wahl's proof of $\mu(6)=65$ | 5 pages | null | null | null | math.AG | null | D. Jaffe and D. Ruberman proved in 1997 that a sextic hypersurface in
$\mathbb{P}^3$ has at most 65 nodes (the bound is sharp by Barth's
construction).
Almost at the same time, J. Wahl proposed a much shorter proof of the same
result, by proving that a linear code $V\subset \F^{66}$ with weights in
$\{24,32,40\}$ has dimension $\dim(V)\leq12$.
He claimed that Jaffe-Ruberman's theorem follows as a corollary since the
code associated to a sextic with n nodes has dimension at least $n-53$ and an
incorrect result stated by Casnati and Catanese asserted that the possible
cardinalities of an even set of nodes on a sextic were only 24, 32 and 40.
Recently Catanese and Tonoli showed that the possible cardinalities of an
even set of nodes on a sextic are exactly 24, 32, 40, 56. According to the
above cardinalities, the theorem of Jaffe and Ruberman reduces to the
following:
Let $V\subset \F^{66}$ be a code with weights in $\{24,32,40,56\}$. Then
$\dim(V)\leq12$.
In this short note we give an elementary proof of this theorem using and
integrating Wahl's ideas.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 07:22:30 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Pignatelli",
"Roberto",
""
],
[
"Tonoli",
"Fabio",
""
]
] |
0706.4359 | Lorenzo Luis Salcedo | L.L. Salcedo | Existence of positive representations for complex weights | 9 pages, no figures. To appear in J.Phys.A | J.Phys.A40:9399,2007 | 10.1088/1751-8113/40/31/016 | null | hep-lat math-ph math.MP | null | The necessity of computing integrals with complex weights over manifolds with
a large number of dimensions, e.g., in some field theoretical settings, poses a
problem for the use of Monte Carlo techniques. Here it is shown that very
general complex weight functions P(x) on R^d can be represented by real and
positive weights p(z) on C^d, in the sense that for any observable f, <f(x)>_P
= <f(z)>_p, f(z) being the analytical extension of f(x). The construction is
extended to arbitrary compact Lie groups.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 07:38:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Salcedo",
"L. L.",
""
]
] |
0706.4360 | Shinya Wanajo | Shinya Wanajo | Cold r-Process in Neutrino-Driven Winds | 5 pages, 3 figures, accepted for publication in ApJL | null | 10.1086/521724 | null | astro-ph | null | The r-process in a low temperature environment is explored, in which the
neutron emission by photodisintegration does not play a role (cold r-process).
A semi-analytic neutrino-driven wind model is utilized for this purpose. The
temperature in a supersonically expanding outflow can quickly drop to a few
10^8 K, where the (n, gamma)-(gamma, n) equilibrium is never achieved during
the heavy r-nuclei synthesis. In addition, the neutron capture competes with
the beta-decay owing to the low matter density. Despite such non-standard
physical conditions for the cold r-process, a solar-like r-process abundance
curve can be reproduced. The cold r-process predicts, however, the low lead
production compared to that expected in the traditional r-process conditions,
which can be a possible explanation for the low lead abundances found in a
couple of r-process-rich Galactic halo stars.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 07:54:57 GMT"
},
{
"version": "v2",
"created": "Sat, 21 Jul 2007 01:27:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wanajo",
"Shinya",
""
]
] |
0706.4361 | Enrico Scomparin | NA60 Collaboration, R. Arnaldi, et al | J/psi production in Indium-Indium collisions at 158 GeV/nucleon | 5 pages, 1 table, 4 figures, accepted for publication by PRL | null | null | null | nucl-ex | null | The NA60 experiment studies muon pair production at the CERN SPS. In this
letter we report on a precision measurement of J/psi in In-In collisions. We
have studied the J/psi centrality distribution, and we have compared it with
the one expected if absorption in cold nuclear matter were the only active
suppression mechanism. For collisions involving more than ~80 participant
nucleons, we find that an extra suppression is present. This result is in
qualitative agreement with previous Pb-Pb measurements by the NA50 experiment,
but no theoretical explanation is presently able to coherently describe both
results.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 07:47:54 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"NA60 Collaboration",
"",
""
],
[
"Arnaldi",
"R.",
""
]
] |
0706.4362 | Nicoleta Brinzei | Nicoleta Brinzei | A Special Nonlinear Connection in Second Order Geometry | 13 pages | null | null | null | math.DG math-ph math.MP | null | We show that, for mechanical system with external forces, the equations of
deviations of solution curves of the corresponding Lagrange equations,determine
a nonlinear connection on the second order osculator (second order tangent)
bundle. In particular, Jacobi equations in Finsler and Riemann spaces determine
such a nonlinear connection.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 07:49:42 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Brinzei",
"Nicoleta",
""
]
] |
0706.4363 | Gregory V. Vereshchagin | R. Ruffini, G.V. Vereshchagin, S.-S. Xue | Vacuum polarization and plasma oscillations | to appear in Phys. Lett. A | Phys.Lett.A371:399-405,2007 | 10.1016/j.physleta.2007.06.056 | null | astro-ph physics.plasm-ph | null | We evidence the existence of plasma oscillations of electrons-positron pairs
created by the vacuum polarization in an uniform electric field with E < Ec.
Our general treatment, encompassing also the traditional, well studied case of
E > Ec, shows the existence in both cases of a maximum Lorentz factor acquired
by electrons and positrons and allows determination of the a maximal length of
oscillation. We quantitatively estimate how plasma oscillations reduce the rate
of pair creation and increase the time scale of the pair production. These
results are particularly relevant in view of the experimental progress in
approaching the field strengths E < Ec.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 07:58:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ruffini",
"R.",
""
],
[
"Vereshchagin",
"G. V.",
""
],
[
"Xue",
"S. -S.",
""
]
] |
0706.4364 | Ibragim Alikhanov | I. Alikhanov, O. Grebenyuk | Transverse $\Lambda^0$ polarization in inclusive photoproduction: quark
recombination model | 7 pages, 5 figures | null | null | null | hep-ph | null | Transverse polarization of $\Lambda^0$ hyperons in inclusive photoproduction
at x_F>0 is tackled within the framework of the quark recombination model,
which has been successfully applied to the polarization of different hyperons
in a variety of unpolarized hadron-hadron reactions. The results are compared
with recent experimental data of HERMES.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:04:11 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 13:01:24 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Alikhanov",
"I.",
""
],
[
"Grebenyuk",
"O.",
""
]
] |
0706.4365 | Ying Hu | Ying Hu (IRMAR), Shanjian Tang (School of Mathematical Sciences) | Multi-dimensional BSDE with Oblique Reflection and Optimal Switching | null | null | null | null | math.PR | null | In this paper, we study a multi-dimensional backward stochastic differential
equation (BSDE) with oblique reflection, which is a BSDE reflected on the
boundary of a special unbounded convex domain along an oblique direction, and
which arises naturally in the study of optimal switching problem. The existence
of the adapted solution is obtained by the penalization method, the monotone
convergence, and the a priori estimations. The uniqueness is obtained by a
verification method (the first component of any adapted solution is shown to be
the vector value of a switching problem for BSDEs). As applications, we apply
the above results to solve the optimal switching problem for stochastic
differential equations of functional type, and we give also a probabilistic
interpretation of the viscosity solution to a system of variational
inequalities.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:15:12 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 04:44:13 GMT"
}
] | 2007-07-04T00:00:00 | [
[
"Hu",
"Ying",
"",
"IRMAR"
],
[
"Tang",
"Shanjian",
"",
"School of Mathematical Sciences"
]
] |
0706.4366 | Toru Sekido | Tsuneo Suzuki, Katsuya Ishiguro, Yoshiaki Koma, Toru Sekido | Gauge-independent Abelian mechanism of color confinement in gluodynamics | 4 pages, 6 Postscript figures | Phys.Rev.D77:034502,2008 | 10.1103/PhysRevD.77.034502 | KANAZAWA 07-09 | hep-lat hep-ph hep-th | null | Abelian mechanism of non-Abelian color confinement is observed in a
gauge-independent way by high precision lattice Monte Carlo simulations in
gluodynamics. An Abelian gauge field is extracted with no gauge-fixing. A
static quark-antiquark potential derived from Abelian Polyakov loop correlators
gives us the same string tension as the non-Abelian one. The Hodge
decomposition of the Abelian Polyakov loop correlator to the regular photon and
the singular monopole parts also reveals that only the monopole part is
responsible for the string tension. The investigation of the flux-tube profile
then shows that Abelian electric fields defined in an arbitrary color direction
are squeezed by monopole supercurrents with the same color direction, and the
quantitative features of flux squeezing are consistent with those observed
previously after Abelian projections with gauge fixing. Gauge independence of
Abelian and monopole dominance strongly supports that the mechanism of
non-Abelian color confinement is due to the Abelian dual Meissner effect.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:15:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Suzuki",
"Tsuneo",
""
],
[
"Ishiguro",
"Katsuya",
""
],
[
"Koma",
"Yoshiaki",
""
],
[
"Sekido",
"Toru",
""
]
] |
0706.4367 | Kazuki Ohishi | K. Ohishi, R. H. Heffner, G. D. Morris, E. D. Bauer, M. J. Graf, J.-X.
Zhu, L. A. Morales, J. L. Sarrao, M. J. Fluss, D. E. MacLaughlin, L. Shu, W.
Higemoto, T. U. Ito | Muon spin rotation measurements of the superfluid density in fresh and
aged superconducting PuCoGa$_5$ | 11 pages | null | 10.1103/PhysRevB.76.064504 | null | cond-mat.str-el cond-mat.supr-con | null | We have measured the temperature dependence and magnitude of the superfluid
density $\rho_{\rm s}(T)$ via the magnetic field penetration depth $\lambda(T)$
in PuCoGa$_5$ (nominal critical temperature $T_{c0} = 18.5$ K) using the muon
spin rotation technique in order to investigate the symmetry of the order
parameter, and to study the effects of aging on the superconducting properties
of a radioactive material. The same single crystals were measured after 25 days
($T_c = 18.25$ K) and 400 days ($T_c = 15.0$ K) of aging at room temperature.
The temperature dependence of the superfluid density is well described in both
materials by a model using d-wave gap symmetry. The magnitude of the muon spin
relaxation rate $\sigma$ in the aged sample, $\sigma\propto
1/\lambda^2\propto\rho_s/m^*$, where $m^*$ is the effective mass, is reduced by
about 70% compared to fresh sample. This indicates that the scattering from
self-irradiation induced defects is not in the limit of the conventional
Abrikosov-Gor'kov pair-breaking theory, but rather in the limit of short
coherence length (about 2 nm in PuCoGa$_5$) superconductivity.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:19:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ohishi",
"K.",
""
],
[
"Heffner",
"R. H.",
""
],
[
"Morris",
"G. D.",
""
],
[
"Bauer",
"E. D.",
""
],
[
"Graf",
"M. J.",
""
],
[
"Zhu",
"J. -X.",
""
],
[
"Morales",
"L. A.",
""
],
[
"Sarrao",
"J. L.",
""
],
[
"Fluss",
"M. J.",
""
],
[
"MacLaughlin",
"D. E.",
""
],
[
"Shu",
"L.",
""
],
[
"Higemoto",
"W.",
""
],
[
"Ito",
"T. U.",
""
]
] |
0706.4368 | Carlo Petronio | Carlo Petronio, Damian Heard and Ekaterina Pervova | Combinatorial and geometric methods in topology | This expository paper is the text of a conference given by the author
to a broad audience of mathematicians. An upcoming article will contain more
detailed proofs and an accurate description of the hyperbolic and
non-hyperbolic orientable manifolds obtained by gluing together in pairs the
faces of the octahedron. Appendix by Damian Heard and Ekaterina Pervova | Milan J. Math. 76 (2008), 69-92 | null | null | math.GT | null | Starting from the (apparently) elementary problem of deciding how many
different topological spaces can be obtained by gluing together in pairs the
faces of an octahedron, we will describe the central role played by hyperbolic
geometry within three-dimensional topology. We will also point out the striking
difference with the two-dimensional case, and we will review some of the
results of the combinatorial and computational approach to three-manifolds
developed by different mathematicians over the last several years.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:24:05 GMT"
}
] | 2011-01-18T00:00:00 | [
[
"Petronio",
"Carlo",
""
],
[
"Heard",
"Damian",
""
],
[
"Pervova",
"Ekaterina",
""
]
] |
0706.4369 | Karina Caputi | K.I. Caputi | The role of HST in the study of near- and mid-infrared-selected galaxies | To appear in the proceedings of the 41st ESLAB Symposium "The impact
of HST on European Astronomy". 4 pages, 1 figure | null | 10.1007/978-90-481-3400-7_43 | null | astro-ph | null | Because of their unique quality, Hubble Space Telescope (HST) data have
played an important complementary role in studies of infrared (IR) galaxies
conducted with major facilities, as VLT or Spitzer, and will be as well very
valuable for future telescopes as Herschel and ALMA. I review here some of the
most recent works led by European astronomers on IR galaxies, and discuss the
role that HST has had in the study of different IR galaxy populations. I
particularly focus the analysis on the GOODS fields, where the multiwavelength
data and unique HST coverage have enabled to jointly put constraints on the
evolution of star formation activity and stellar-mass growth with cosmic time.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:38:47 GMT"
}
] | 2023-04-05T00:00:00 | [
[
"Caputi",
"K. I.",
""
]
] |
0706.4370 | Keisuke Hatada | Keisuke Hatada and Jesus Chaboy | Role of the exchange and correlation potential into calculating the
x-ray absorption spectra of half-metallic alloys: the case of Mn and Cu
K-edge XANES in Cu$_2$MnM (M = Al, Sn, In) Heusler alloys | 15 pages, 5 figures | Phys. Rev. B 76, 104411-6 (2007) | 10.1103/PhysRevB.76.104411 | null | cond-mat.mtrl-sci cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work reports a theoretical study of the x-ray absorption near-edge
structure spectra at both the Cu and the Mn K-edge in several Cu$_2$MnM (M= Al,
Sn and In) Heusler alloys. Our results show that {\it ab-initio} single-channel
multiple-scattering calculations are able of reproducing the experimental
spectra. Moreover, an extensive discussion is presented concerning the role of
the final state potential needed to reproduce the experimental data of these
half-metallic alloys. In particular, the effects of the cluster-size and of the
exchange and correlation potential needed in reproducing all the experimental
XANES features are discussed.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:40:07 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 08:47:54 GMT"
},
{
"version": "v3",
"created": "Thu, 29 Sep 2011 09:51:25 GMT"
}
] | 2011-09-30T00:00:00 | [
[
"Hatada",
"Keisuke",
""
],
[
"Chaboy",
"Jesus",
""
]
] |
0706.4371 | Baptiste Meneux | B. Meneux, L. Guzzo, B. Garilli, O. Le Fevre, A. Pollo, J. Blaizot, G.
De Lucia, M. Bolzonella, F. Lamareille, L. Pozzetti, A. Cappi, A. Iovino, C.
Marinoni, H.J. McCracken, S. de la Torre, D. Bottini, V. Le Brun, D.
Maccagni, J.P. Picat, R. Scaramella, M. Scodeggio, L. Tresse, G. Vettolani,
A. Zanichelli, U. Abbas, C. Adami, S. Arnouts, S. Bardelli, A. Bongiorno, S.
Charlot, P. Ciliegi, T. Contini, O. Cucciati, S. Foucaud, P. Franzetti, I.
Gavignaud, O. Ilbert, B. Marano, A. Mazure, R. Merighi, S. Paltani, R. Pello,
M. Radovich, D. Vergani, G. Zamorani, E. Zucca | The VIMOS-VLT Deep Survey. The dependence of clustering on galaxy
stellar mass at z~1 | 13 pages, 10 figures, accepted in A&A | null | 10.1051/0004-6361:20078182 | null | astro-ph | null | Aims: We use the VVDS-Deep first-epoch data to measure the dependence of
galaxy clustering on galaxy stellar mass, at z~0.85.
Methods: We measure the projected correlation function wp(rp) for sub-samples
with 0.5<z<1.2 covering different mass ranges between 10^9 and 10^11 Msun. We
quantify in detail the observational selection biases using 40 mock catalogues
built from the Millennium run and semi-analytic models.
Results: Our simulations indicate that serious incompleteness in mass is
present only for log(M/Msun)<9.5. In the mass range log(M/Msun)=[9.0-9.5], the
photometric selection function of the VVDS misses 2/3rd of the galaxies. The
sample is virtually 100% complete above 10^10 Msun. We present the first direct
evidence for a clear dependence of clustering on the galaxy stellar mass at
z~0.85. The clustering length increases from r0 ~ 2.76 h^-1 Mpc for galaxies
with mass M>10^9 Msun to r0 ~ 4.28 h^-1 Mpc for galaxies more massive than
10^10.5 Msun. At the same time, the slope increases from ~ 1.67 to ~ 2.28.
A comparison of the observed wp(rp) to local measurements by the SDSS shows
that the evolution is faster for objects less massive than ~10^10.5 Msun. This
is interpreted as a higher dependence on redshift of the linear bias b_L for
the more massive objects. While for the most massive galaxies b_L decreases
from 1.5+/-0.2 at z~0.85 to 1.33+/-0.03 at z~0.15, the less massive population
maintains a virtually constant value b_L~1.3. This result is in agreement with
a scenario in which more massive galaxies formed at high redshift in the
highest peaks of the density field, while less massive objects form at later
epochs from the more general population of dark-matter halos.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:40:28 GMT"
},
{
"version": "v2",
"created": "Mon, 12 Nov 2007 16:13:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Meneux",
"B.",
""
],
[
"Guzzo",
"L.",
""
],
[
"Garilli",
"B.",
""
],
[
"Fevre",
"O. Le",
""
],
[
"Pollo",
"A.",
""
],
[
"Blaizot",
"J.",
""
],
[
"De Lucia",
"G.",
""
],
[
"Bolzonella",
"M.",
""
],
[
"Lamareille",
"F.",
""
],
[
"Pozzetti",
"L.",
""
],
[
"Cappi",
"A.",
""
],
[
"Iovino",
"A.",
""
],
[
"Marinoni",
"C.",
""
],
[
"McCracken",
"H. J.",
""
],
[
"de la Torre",
"S.",
""
],
[
"Bottini",
"D.",
""
],
[
"Brun",
"V. Le",
""
],
[
"Maccagni",
"D.",
""
],
[
"Picat",
"J. P.",
""
],
[
"Scaramella",
"R.",
""
],
[
"Scodeggio",
"M.",
""
],
[
"Tresse",
"L.",
""
],
[
"Vettolani",
"G.",
""
],
[
"Zanichelli",
"A.",
""
],
[
"Abbas",
"U.",
""
],
[
"Adami",
"C.",
""
],
[
"Arnouts",
"S.",
""
],
[
"Bardelli",
"S.",
""
],
[
"Bongiorno",
"A.",
""
],
[
"Charlot",
"S.",
""
],
[
"Ciliegi",
"P.",
""
],
[
"Contini",
"T.",
""
],
[
"Cucciati",
"O.",
""
],
[
"Foucaud",
"S.",
""
],
[
"Franzetti",
"P.",
""
],
[
"Gavignaud",
"I.",
""
],
[
"Ilbert",
"O.",
""
],
[
"Marano",
"B.",
""
],
[
"Mazure",
"A.",
""
],
[
"Merighi",
"R.",
""
],
[
"Paltani",
"S.",
""
],
[
"Pello",
"R.",
""
],
[
"Radovich",
"M.",
""
],
[
"Vergani",
"D.",
""
],
[
"Zamorani",
"G.",
""
],
[
"Zucca",
"E.",
""
]
] |
0706.4372 | Dmitri Mogilevtsev | D. Mogilevtsev, A. P. Nisovtsev, S. Kilin, S. B. Cavalcanti, H. S.
Brandi and L. E. Oliveira | Driving-dependent damping of Rabi oscillations in two-level
semiconductor systems | null | null | 10.1103/PhysRevLett.100.017401 | null | quant-ph | null | We propose a mechanism to explain the nature of the damping of Rabi
oscillations with increasing driving-pulse area in localized semiconductor
systems, and have suggested a general approach which describes a coherently
driven two-level system interacting with a dephasing reservoir. Present
calculations show that the non-Markovian character of the reservoir leads to
the dependence of the dephasing rate on the driving-field intensity, as
observed experimentally. Moreover, we have shown that the damping of Rabi
oscillations might occur as a result of different dephasing mechanisms for both
stationary and non-stationary effects due to coupling to the environment.
Present calculated results are found in quite good agreement with available
experimental measurements.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:41:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mogilevtsev",
"D.",
""
],
[
"Nisovtsev",
"A. P.",
""
],
[
"Kilin",
"S.",
""
],
[
"Cavalcanti",
"S. B.",
""
],
[
"Brandi",
"H. S.",
""
],
[
"Oliveira",
"L. E.",
""
]
] |
0706.4373 | Yoshio Koide | Yoshio Koide and Eiichi Takasugi | Neutrino Mixing based on Mass Matrices with a $2 \leftrightarrow 3$
Symmetry | 12 pages, title and conclusions modified | Phys.Rev.D77:016006,2008 | 10.1103/PhysRevD.77.016006 | null | hep-ph | null | Under the assumption that the $2\leftrightarrow 3$ symmetry is broken only
through phases, we give a systematical investigation of possible lepton mass
matrix forms without referring to the explicit parameter values. The two types
of the $2\leftrightarrow 3$ symmetry are investigated: one is that the left-
and right-handed fields $(f_L, f_R)$ obey the symmetry, and another one is that
only $f_L$ obeys the symmetry. In latter case, in spite of no $2\leftrightarrow
3$ symmetry in the Majorana mass matrix $M_R$ for $\nu_R$, the neutrino seesaw
mass matrix still obey the $2\leftrightarrow 3$ symmetry. Possible
phenomenologies are discussed.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:51:56 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Jul 2007 10:20:05 GMT"
},
{
"version": "v3",
"created": "Fri, 19 Oct 2007 01:24:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Koide",
"Yoshio",
""
],
[
"Takasugi",
"Eiichi",
""
]
] |
0706.4374 | Antoine Bret | A. Bret | Filamentation instability in a quantum plasma | To appear in Physics of Plasmas | null | 10.1063/1.2759886 | null | physics.plasm-ph astro-ph physics.space-ph | null | The growth rate of the filamentation instability triggered when a diluted
cold electron beam passes through a cold plasma is evaluated using the quantum
hydrodynamic equations. Compared with a cold fluid model, quantum effects
reduce both the unstable wave vector domain and the maximum growth rate.
Stabilization of large wave vector modes is always achieved, but significant
reduction of the maximum growth rate depends on a dimensionless parameter that
is provided. Although calculations are extended to the relativistic regime,
they are mostly relevant to the non-relativistic one.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:57:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bret",
"A.",
""
]
] |
0706.4375 | Thierry Hamon | Thierry Hamon (LIPN), Adeline Nazarenko (LIPN), Thierry Poibeau
(LIPN), Sophie Aubin (LIPN), Julien Derivi\`ere (LIPN) | A Robust Linguistic Platform for Efficient and Domain specific Web
Content Analysis | null | Proceedings of RIAO 2007 (30/05/2007) | null | null | cs.AI | null | Web semantic access in specific domains calls for specialized search engines
with enhanced semantic querying and indexing capacities, which pertain both to
information retrieval (IR) and to information extraction (IE). A rich
linguistic analysis is required either to identify the relevant semantic units
to index and weight them according to linguistic specific statistical
distribution, or as the basis of an information extraction process. Recent
developments make Natural Language Processing (NLP) techniques reliable enough
to process large collections of documents and to enrich them with semantic
annotations. This paper focuses on the design and the development of a text
processing platform, Ogmios, which has been developed in the ALVIS project. The
Ogmios platform exploits existing NLP modules and resources, which may be tuned
to specific domains and produces linguistically annotated documents. We show
how the three constraints of genericity, domain semantic awareness and
performance can be handled all together.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 08:58:02 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Hamon",
"Thierry",
"",
"LIPN"
],
[
"Nazarenko",
"Adeline",
"",
"LIPN"
],
[
"Poibeau",
"Thierry",
"",
"LIPN"
],
[
"Aubin",
"Sophie",
"",
"LIPN"
],
[
"Derivière",
"Julien",
"",
"LIPN"
]
] |
0706.4376 | Pekka Alitalo | Pekka Alitalo, Olli Luukkonen, Liisi Jylh\"a, Jukka Venermo, Sergei
Tretyakov | Transmission-line networks cloaking objects from electromagnetic fields | 17 pages | IEEE Transactions on Antennas and Propagation, vol. 56, no. 2, pp.
416 - 424, 2008. | 10.1109/TAP.2007.915469 | null | physics.class-ph | null | We consider a novel method of cloaking objects from the surrounding
electromagnetic fields in the microwave region. The method is based on
transmission-line networks that simulate the wave propagation in the medium
surrounding the cloaked object. The electromagnetic fields from the surrounding
medium are coupled into the transmission-line network that guides the waves
through the cloak thus leaving the cloaked object undetected. The cloaked
object can be an array or interconnected mesh of small inclusions that fit
inside the transmission-line network.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 09:33:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alitalo",
"Pekka",
""
],
[
"Luukkonen",
"Olli",
""
],
[
"Jylhä",
"Liisi",
""
],
[
"Venermo",
"Jukka",
""
],
[
"Tretyakov",
"Sergei",
""
]
] |
0706.4377 | Dimitrios Gouliermis | Dimitrios A. Gouliermis, Thomas Henning, Wolfgang Brandner, Andrew E.
Dolphin, Michael Rosa, Bernhard Brandl | Discovery of the Pre-Main Sequence Population of the Stellar Association
LH 95 in the Large Magellanic Cloud with Hubble Space Telescope ACS
Observations | Accepted for Publication in ApJ Letters - 4 Pages ApJ paper format -
3 figures in low-resolution/grayscale | null | 10.1086/521224 | null | astro-ph | null | We report the discovery of an extraordinary number of pre-main sequence (PMS)
stars in the vicinity of the stellar association LH 95 in the Large Magellanic
Cloud (LMC). Using the {\em Advanced Camera for Surveys} on-board the {\em
Hubble} Space Telescope in wide-field mode we obtained deep high-resolution
imaging of the main body of the association and of a nearby representative LMC
background field. These observations allowed us to construct the
color-magnitude diagram (CMD) of the association in unprecedented detail, and
to decontaminate the CMD for the average LMC stellar population. The most
significant result is the direct detection of a substantial population of PMS
stars and their clustering properties with respect to the distribution of the
higher mass members of the association. Although LH 95 represents a rather
modest star forming region, our photometry, with a detection limit $V$ \lsim 28
mag, reveals in its vicinity more than 2,500 PMS stars with masses down to
$\sim 0.3$ M{\solar}. Our observations offer, thus, a new perspective of a
typical LMC association: The stellar content of LH 95 is found to extend from
bright OB stars to faint red PMS stars, suggesting a fully populated Initial
Mass Function (IMF) from the massive blue giants down to the sub-solar mass
regime.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 09:12:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gouliermis",
"Dimitrios A.",
""
],
[
"Henning",
"Thomas",
""
],
[
"Brandner",
"Wolfgang",
""
],
[
"Dolphin",
"Andrew E.",
""
],
[
"Rosa",
"Michael",
""
],
[
"Brandl",
"Bernhard",
""
]
] |
0706.4378 | Brihaye Yves | Y. Brihaye, E. Radu | Magnetic solutions in AdS$_5$ and trace anomalies | 8 pages, 2 figures | Phys.Lett.B658:164-169,2008 | 10.1016/j.physletb.2007.09.075 | null | hep-th | null | We discuss black hole and black string solutions in d=5 Einstein-Yang-Mills
theory with negative cosmological constant, proposing a method to compute their
mass and action. The magnetic gauge field of these configurations does not
vanish at infinity. We argue that this implies a nonvanishing trace for the
stress tensor of the dual d=4 theory.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 09:20:31 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 06:49:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brihaye",
"Y.",
""
],
[
"Radu",
"E.",
""
]
] |
0706.4379 | George Harry Hitching | George H. Hitching | Quartic equations and 2-division on elliptic curves | 20 pages | null | null | null | math.AG | null | Let K be a field of characteristic different from 2 and C an elliptic curve
over K given by a Weierstrass equation. To divide an element of the group C by
2, one must solve a certain quartic equation. We characterise the quartics
arising from this procedure and find how far the quartic determines the curve
and the point. We find the quartics coming from 2-division of 2- and 3-torsion
points, and generalise this correspondence to singular plane cubics. We use
these results to study the question of which degree 4 maps of curves can be
realised as duplication of a multisection on an elliptic surface.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 09:46:35 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Hitching",
"George H.",
""
]
] |
0706.4380 | Thorsten Renk | Thorsten Renk, Kari J. Eskola | Prospects of Jet Tomography Using Hard Processes inside a Soft Medium | 10 pages, 7 figures, talk given at the workshop 'High p_T physics at
the LHC', University of Jyvaskyla, Jyvaskyla, Finland, 23-27 March, 2007 | PoSLHC07:032,2007 | null | null | hep-ph | null | The term 'tomography' is commonly applied to the idea of studying properties
of a medium by the modifications this medium induces to a known probe
propagating through it. In the context of ultrarelativistic heavy-ion
collisions, rare high transverse momentum (p_T) processes taking place
alongside soft bulk-matter production can be viewed as a tomographic probe as
long as the energy scales are such that the modification of high p_T processes
can be dominantly ascribed to interactions with the medium during the
propagation of partons. Various high p_T observables have been suggested for
tomography, among them hard single hadron suppression, dihadron correlations
and gamma-hadron correlations. In this paper, we present a model study of a
number of different observables within the same calculational framework to
assess the sensitivity of the observables to different properties of the medium
and discuss the prospects of obtaining tomographic information.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 10:13:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Renk",
"Thorsten",
""
],
[
"Eskola",
"Kari J.",
""
]
] |
0706.4381 | Xuguang Huang | Xuguang Huang, Qun Wang and Pengfei Zhuang | Neutrino Emission From Direct Urca Processes in Pion Condensed Quark
Matter | 12 pages,6 figures, published version | Phys.Rev.D76:094008,2007 | 10.1103/PhysRevD.76.094008 | null | hep-ph astro-ph nucl-th | null | We study neutrino emission from direct Urca processes in pion condensed quark
matter. In compact stars with high baryon density, the emission is dominated by
the gapless modes of the pion condensation which leads to an enhanced
emissivity. While for massless quarks the enhancement is not remarkable, the
emissivity is significantly larger and the cooling of the condensed matter is
considerably faster than that in normal quark matter when the mass difference
between $u$- and $d$-quarks is sizable.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 10:10:47 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 10:12:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Huang",
"Xuguang",
""
],
[
"Wang",
"Qun",
""
],
[
"Zhuang",
"Pengfei",
""
]
] |
0706.4382 | Collaboration Secretariat Opal | The OPAL collaboration, et al | Inclusive Jet Production in Photon-Photon Collisions at sqrt(s_ee) from
189 to 209 GeV | 17 pages, 4 figures, Submitted to Phys. Letts. B | Phys.Lett.B658:185-192,2008 | 10.1016/j.physletb.2007.08.096 | CERN-PH-EP/2007-016 | hep-ex | null | Inclusive jet production (e+e- -> e+e- +jet+X) is studied in collisions of
quasi-real photons radiated by the LEP beams at e+e- centre-of-mass energies
sqrt see from 189 to 209 GeV. Jets are reconstructed using the kp jet
algorithm. The inclusive differential cross-section is measured as a function
of the jet transverse momentum, ptjet, in the range 5 <ptjet < 40 GeV for
pseudo-rapidities, etaj, in the range -1.5 < etaj < 1.5. The results are
compared to predictions of perturbative QCD in next-to-leading order in the
strong coupling constant.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 10:12:23 GMT"
}
] | 2010-04-21T00:00:00 | [
[
"The OPAL collaboration",
"",
""
]
] |
0706.4383 | Cyril Pitrou | Cyril Pitrou | Gauge invariant Boltzmann equation and the fluid limit | 36 pages | Class.Quant.Grav.24:6127-6158,2007 | 10.1088/0264-9381/24/24/001 | null | gr-qc astro-ph | null | This article investigates the collisionless Boltzmann equation up to second
order in the cosmological perturbations. It describes the gauge dependence of
the distribution function and the construction of a gauge invariant
distribution function and brightness, and then derives the gauge invariant
fluid limit.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 18:17:24 GMT"
},
{
"version": "v2",
"created": "Tue, 27 Nov 2007 15:13:08 GMT"
},
{
"version": "v3",
"created": "Thu, 1 May 2008 09:36:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pitrou",
"Cyril",
""
]
] |
0706.4384 | Dibyendu Roy | N. Kumar | Resistance without resistors: An anomaly | 6 pages, 4 figures | null | null | null | cond-mat.dis-nn cond-mat.mes-hall | null | The elementary 2-terminal network consisting of a resistively ($R-$) shunted
inductance ($L$) in series with a capacitatively ($C-$) shunted resistance
($R$) with $R = \sqrt{L/C}$, is known for its non-dispersive dissipative
response, $i.e.,$ with the input impedance $Z_0(\omega) = R$, independent of
the frequency ($\omega$). In this communication we examine the properties of a
novel equivalent network derived iteratively from this 2-terminal network by
replacing everywhere the elemental resistive part $R$ with the whole 2-terminal
network. This replacement suggests a recursion $Z_{n+1}(\omega) =
f(Z_n(\omega))$, with the recursive function $f(z) = (i\omega Lz/i\omega L + z)
+ (z/1+i\omega Cz)$. The recursive map has two fixed points -- an unstable
fixed point $Z_u^\star = 0$, and a stable fixed point $Z_s^\star = R$. Thus,
resistances at the boundary terminating the infinitely iterated network can now
be made arbitrarily small without changing the input impedance $Z_\infty (=
R)$. This, therefore, leads to realizing in the limit $n\to\infty$ an
effectively dissipative network comprising essentially non-dissipative reactive
elements ($L$ and $C$) only. Hence the oxymoron -- resistance without
resistors! This is best viewed as a classical anomaly akin to the one
encountered in turbulence. Possible application as a formal decoherence device
-- the {\it fake channel} -- is briefly discussed for its quantum analogue.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 10:31:10 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Kumar",
"N.",
""
]
] |
0706.4385 | Steven Watterson | Steven Watterson | The chiral and flavour projection of Dirac-Kahler fermions in the
geometric discretization | v2: 17 pages, Latex. 5 images eps. Added references, reformatted and
clarification of some points | Int.J.Geom.Meth.Mod.Phys.05:345-362,2008 | 10.1142/S0219887808002825 | null | hep-lat | null | It is shown that an exact chiral symmetry can be described for Dirac-Kahler
fermions using the two complexes of the geometric discretization. This
principle is extended to describe exact flavour projection and it is shown that
this necessitates the introduction of a new operator and two new structures of
complex. To describe simultaneous chiral and flavour projection, eight
complexes are needed in all and it is shown that projection leaves a single
flavour of chiral field on each.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 10:34:31 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Aug 2007 18:18:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Watterson",
"Steven",
""
]
] |
0706.4386 | Masamichi Miyama | Masamichi J. Miyama and Shin-ichi Sasa | The order-disorder transition in colloidal suspensions under shear flow | 11 pages, 10 figures, v.2: We have made some small improvements on
presentations | J. Phys.: Condens. Matter 20 (2008) 035104 (6pp). | 10.1088/0953-8984/20/03/035104 | null | cond-mat.stat-mech cond-mat.soft | null | We study the order-disorder transition in colloidal suspensions under shear
flow by performing Brownian dynamics simulations. We characterize the
transition in terms of a statistical property of time-dependent maximum value
of the structure factor. We find that its power spectrum exhibits the power-law
behaviour only in the ordered phase. The power-law exponent is approximately -2
at frequencies greater than the magnitude of the shear rate, while the power
spectrum exhibits the $1 / f$-type fluctuations in the lower frequency regime.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 10:35:30 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 09:28:28 GMT"
}
] | 2008-05-14T00:00:00 | [
[
"Miyama",
"Masamichi J.",
""
],
[
"Sasa",
"Shin-ichi",
""
]
] |
0706.4387 | Gergely G\'abor Barnaf\"oldi | G.G. Barnafoldi, P. Levai, B.A. Cole, G. Fai, G. Papp | Particle Ratios at High p_T at LHC Energies | 2 pages, 1 figure, Presented at "Heavy Ion Collisions at the LHC Last
Call for Predictions" | null | null | null | hep-ph | null | Hadron production has been calculated in a pQCD improved parton model for pp,
dA and heavy ion collisions. We applied KKP and AKK fragmentation functions.
Our jet fragmentation study shows, that hadron ratios at high p_T depend on
quark contribution mostly and less on the gluonic one. This finding can be seen
in jet-energy loss calculations, also. We display the suppression pattern on
different hadron ratios in PbPb collisions at LHC energies.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 10:49:45 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Barnafoldi",
"G. G.",
""
],
[
"Levai",
"P.",
""
],
[
"Cole",
"B. A.",
""
],
[
"Fai",
"G.",
""
],
[
"Papp",
"G.",
""
]
] |
0706.4388 | Andrew J. Norton | A.J.Norton (1) and K.Mukai (2) ((1) The Open University (2) NASA/GSFC
and University of Maryland) | A precessing accretion disc in the intermediate polar XY Ari? | Accepted for publication in Astronomy & Astrophysics | null | 10.1051/0004-6361:20077761 | null | astro-ph | null | XY Ari is the only intermediate polar to show deep X-ray eclipses of its
white dwarf. Previously published observations with Ginga and Chandra have also
revealed a broad X-ray orbital modulation, roughly antiphased with the eclipse,
and presumed to be due to absorption in an extended structure near the edge of
an accretion disc. The X-ray pulse profile is generally seen to be
double-peaked, although a single-peaked pulse was seen by RXTE during an
outburst in 1996.We intended to investigate the cause of the broad orbital
modulation in XY Ari to better understand the accretion flow in this system and
other intermediate polars. We observed XY Ari with RXTE and analysed previously
unpublished archival observations of the system made with ASCA and XMM-Newton.
These observations comprise six separate visits and span about ten years. The
various X-ray observations show that the broad orbital modulation varies in
phase and significance, then ultimately disappears entirely in the last few
years. In addition, the X-ray pulse profile shows variations in depth and
shape, and in the recent RXTE observations displays no evidence for changes in
hardness ratio. The observed changes indicates that both the pulse profile and
the orbital modulation are solely due to geometrical effects at the time of the
RXTE observations, rather than phase-dependent variations in photoelectric
absorption as seen previously. We suggest that this is evidence for a
precessing, tilted accretion disc in this system. The precession of the disc
moves structures out of our line of sight both at its outer edge (changing the
orbital modulation) and at its inner edge where the accretion curtains are
anchored (changing the pulse profile).
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:42:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Norton",
"A. J.",
""
],
[
"Mukai",
"K.",
""
]
] |
0706.4389 | Sergei Sinegovsky | A.A.Kochanov, A.D.Panov, T.S.Sinegovskaya and S.I.Sinegovsky | Calculation of the atmospheric muon flux motivated by the ATIC-2
experiment | Submitted to 30th ICRC, 3-11 July 2007, Merida, Mexico | null | null | null | astro-ph hep-ex | null | We calculate the cosmic ray muon flux at ground level using directly the
primary cosmic ray spectrum and composition measured in the ATIC-2 balloon
experiment. In order to extend the calculations to high energies, up to 100
TeV, we use the data of the GAMMA experiment as well as Zatsepin and Sokolskaya
model. This model, supported by the ATIC-2 data, comprises contributions to the
cosmic ray flux of three classes of astrophysical sources - the shocks from
exploding stars, nova and supernova of different types. The muon flux
computation is based on the method for solution of atmospheric hadron cascade
equations in which rising total inelastic cross-sections of hadron-nuclear
interactions as well as non-power-law character of the primary cosmic ray
spectrum are taken into account. The calculated muon spectrum agrees well with
measurements of L3+Cosmic and BESS-TeV, CAPRICE, Frejus, MACRO, LVD as well as
other experiments.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:50:24 GMT"
}
] | 2011-09-16T00:00:00 | [
[
"Kochanov",
"A. A.",
""
],
[
"Panov",
"A. D.",
""
],
[
"Sinegovskaya",
"T. S.",
""
],
[
"Sinegovsky",
"S. I.",
""
]
] |
0706.4390 | Ildefonso Castro | Ildefonso Castro, Francisco Torralbo and Francisco Urbano | On Hamiltonian stationary Lagrangian spheres in non-Einstein Kaehler
surfaces | 14 pages, 1 figure | Math. Z. 271 (2012), 257-270 | null | null | math.DG | null | Hamiltonian stationary Lagrangian spheres in Kaehler-Einstein surfaces are
minimal. We prove that in the family of non-Einstein Kaehler surfaces given by
the product $\Sigma_1\times\Sigma_2$ of two complete orientable Riemannian
surfaces of different constant Gauss curvatures, there is only a (non minimal)
Hamiltonian stationary Lagrangian sphere. This example is defined when the
surfaces $\Sigma_1$ and $ \Sigma_2$ are spheres.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:21:20 GMT"
}
] | 2012-12-04T00:00:00 | [
[
"Castro",
"Ildefonso",
""
],
[
"Torralbo",
"Francisco",
""
],
[
"Urbano",
"Francisco",
""
]
] |
0706.4391 | Christopher Laumann | C. Laumann, A. Scardicchio, and S.L. Sondhi | Cavity method for quantum spin glasses on the Bethe lattice | 27 pages, 9 figures | Phys. Rev. B 78, 134424 (2008) | 10.1103/PhysRevB.78.134424 | null | cond-mat.stat-mech cond-mat.dis-nn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a generalization of the cavity method to quantum spin glasses on
fixed connectivity lattices. Our work is motivated by the recent refinements of
the classical technique and its potential application to quantum computational
problems. We numerically solve for the phase structure of a connectivity $q=3$
transverse field Ising model on a Bethe lattice with $\pm J$ couplings, and
investigate the distribution of various classical and quantum observables.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:32:34 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Sep 2008 15:16:25 GMT"
}
] | 2009-10-19T00:00:00 | [
[
"Laumann",
"C.",
""
],
[
"Scardicchio",
"A.",
""
],
[
"Sondhi",
"S. L.",
""
]
] |
0706.4392 | Ivanov Dmitry | D.Yu. Ivanov and A. Papa | Vector Meson production from NLL BFKL | 4 pages; talk at 15th International Workshop on Deep Inelastic
Scattering and Related Subjects (DIS 2007), Munich, Germany, 16-20 Apr 2007 | null | null | null | hep-ph | null | The amplitude for the forward electroproduction of two light vector mesons
can be written completely within perturbative QCD in the Regge limit with
next-to-leading accuracy, thus providing the first example of a physical
application of the BFKL approach at the next-to-leading order. We study in the
case of equal photon virtualities the main systematic effects, by considering a
different representation of the amplitude and different optimization methods of
the perturbative series.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:32:49 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Ivanov",
"D. Yu.",
""
],
[
"Papa",
"A.",
""
]
] |
0706.4393 | Nina Shevchenko | N. V. Shevchenko, A. Gal, J. Mare\v{s}, J. R\'evai | $\bar{K}NN$ quasi-bound state and the $\bar{K}N$ interaction:
coupled-channel Faddeev calculations of the $\bar{K}NN - \pi \Sigma N$ system | 22 pages, 7 figures, 4 tables; minor corrections, accepted for
publication in Phys. Rev. C | Phys.Rev.C76:044004,2007 | 10.1103/PhysRevC.76.044004 | null | nucl-th | null | Coupled-channel three-body calculations of an $I=1/2$, $J^{\pi}=0^-$
$\bar{K}NN$ quasi-bound state in the $\bar{K}NN - \pi \Sigma N$ system were
performed and the dependence of the resulting three-body energy on the two-body
$\bar{K}N - \pi \Sigma$ interaction was investigated. Earlier results of
binding energy $B_{K^-pp} \sim 50 -70$ MeV and width $\Gamma_{K^-pp} \sim 100$
MeV are confirmed [N.V. Shevchenko {\it et al.}, Phys. Rev. Lett. {\bf 98},
082301 (2007)]. It is shown that a suitably constructed energy-independent
complex $\bar{K}N$ potential gives a considerably shallower and narrower
three-body quasi-bound state than the full coupled-channel calculation.
Comparison with other calculations is made.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:36:07 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Sep 2007 14:36:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Shevchenko",
"N. V.",
""
],
[
"Gal",
"A.",
""
],
[
"Mareš",
"J.",
""
],
[
"Révai",
"J.",
""
]
] |
0706.4394 | Luc Pronzato | Radoslav Harman, Luc Pronzato (I3S) | Improvements on removing non-optimal support points in D-optimum design
algorithms | 5 pages Statistics and Probability letters available online at:
http://www.elsevier.com/locate/stapro | Statistics & Probability Letters / Statistics and probability
Letters 77 (2007) 90-94 | null | null | math.ST stat.TH | null | We improve the inequality used in Pronzato [2003. Removing non-optimal
support points in D-optimum design algorithms. Statist. Probab. Lett. 63,
223-228] to remove points from the design space during the search for a
$D$-optimum design. Let $\xi$ be any design on a compact space $\mathcal{X}
\subset \mathbb{R}^m$ with a nonsingular information matrix, and let
$m+\epsilon$ be the maximum of the variance function $d(\xi,\mathbf{x})$ over
all $\mathbf{x} \in \mathcal{X}$. We prove that any support point
$\mathbf{x}_{*}$ of a $D$-optimum design on $\mathcal{X}$ must satisfy the
inequality $d(\xi,\mathbf{x}_{*}) \geq
m(1+\epsilon/2-\sqrt{\epsilon(4+\epsilon-4/m)}/2)$. We show that this new lower
bound on $d(\xi,\mathbf{x}_{*})$ is, in a sense, the best possible, and how it
can be used to accelerate algorithms for $D$-optimum design.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:50:29 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Harman",
"Radoslav",
"",
"I3S"
],
[
"Pronzato",
"Luc",
"",
"I3S"
]
] |
0706.4395 | Andreas Str\"ombergsson | Jens Marklof and Andreas Str\"ombergsson | The distribution of free path lengths in the periodic Lorentz gas and
related lattice point problems | Corrected typos, added an index of notation | Annals of Mathematics 172 (2010) 1949-2033 | null | null | math.DS math-ph math.MP math.NT | null | The periodic Lorentz gas describes the dynamics of a point particle in a
periodic array of spherical scatterers, and is one of the fundamental models
for chaotic diffusion. In the present paper we investigate the Boltzmann-Grad
limit, where the radius of each scatterer tends to zero, and prove the
existence of a limiting distribution for the free path length of the periodic
Lorentz gas. We also discuss related problems, such as the statistical
distribution of directions of lattice points that are visible from a fixed
position.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:25:17 GMT"
},
{
"version": "v2",
"created": "Mon, 31 Mar 2008 19:19:40 GMT"
}
] | 2015-09-07T00:00:00 | [
[
"Marklof",
"Jens",
""
],
[
"Strömbergsson",
"Andreas",
""
]
] |
0706.4396 | Thierry Rabilloud | Mireille Chevallet (BBSI), Sylvie Luche, Thierry Rabilloud (BBSI) | Silver staining of proteins in polyacrylamide gels | null | Nat Protoc 1, 4 (2006) 1852-8 | 10.1038/nprot.2006.288 | null | q-bio.GN | null | Silver staining is used to detect proteins after electrophoretic separation
on polyacrylamide gels. It combines excellent sensitivity (in the low nanogram
range) with the use of very simple and cheap equipment and chemicals. It is
compatible with downstream processing, such as mass spectrometry analysis after
protein digestion. The sequential phases of silver staining are protein
fixation, then sensitization, then silver impregnation and finally image
development. Several variants of silver staining are described here, which can
be completed in a time range from 2 h to 1 d after the end of the
electrophoretic separation. Once completed, the stain is stable for several
weeks.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:54:51 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Chevallet",
"Mireille",
"",
"BBSI"
],
[
"Luche",
"Sylvie",
"",
"BBSI"
],
[
"Rabilloud",
"Thierry",
"",
"BBSI"
]
] |
0706.4397 | Martin Horvat | Martin Horvat, Mirko Degli Esposti | Egorov property in perturbed cat map | 12 pages, 7 figures | null | 10.1088/1751-8113/40/32/004 | null | quant-ph | null | We study the time evolution of the quantum-classical correspondence (QCC) for
the well known model of quantised perturbed cat maps on the torus in the very
specific regime of semi-classically small perturbations. The quality of the QCC
is measured by the overlap of classical phase-space density and corresponding
Wigner function of the quantum system called quantum-classical fidelity (QCF).
In the analysed regime the QCF strongly deviates from the known general
behaviour in particular it decays faster then exponential. Here we study and
explain the observed behavior of the QCF and the apparent violation of the QCC
principle.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 11:59:32 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jul 2007 16:37:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Horvat",
"Martin",
""
],
[
"Esposti",
"Mirko Degli",
""
]
] |
0706.4398 | Naoyuki Tateiwa | Naoyuki Tateiwa, Yoshinori Haga, Tatsuma D. Matsuda, Shugo Ikeda,
Etsuji Yamamoto, Yusuke Okuda, Yuichiro Miyauchi, Rikio Settai and Yoshichika
Onuki | Strong-Coupling Superconductivity of CeIrSi$_3$ with the
Non-centrosymmetric Crystal Structure | This paper will be published in J. Phys. Soc. Jpn. on the August
issue of 2007 | null | 10.1143/JPSJ.76.083706 | null | cond-mat.str-el | null | We studied the pressure-induced superconductor CeIrSi$_3$ with the
non-centrosymmetric tetragonal structure under high pressure. The electrical
resistivity and ac heat capacity were measured in the same run for the same
sample. The critical pressure was determined to be $P_{\rm c}$ = 2.25 GPa,
where the antiferromagnetic state disappears. The heat capacity $C_{\rm ac}$
shows both antiferromagnetic and superconducting transitions at pressures close
to $P_{\rm c}$. On the other hand, the superconducting region is extended to
high pressures of up to about 3.5 GPa, with the maximum transition temperature
$T_{\rm sc}$ = 1.6 K around $2.5-2.7$ GPa. At 2.58 GPa, a large heat capacity
anomaly was observed at $T_{\rm sc}$ = 1.59 K. The jump of the heat capacity in
the form of ${\Delta}{C_{\rm ac}}/C_{\rm ac}(T_{\rm sc})$ is 5.7 $\pm$ 0.1.
This is the largest observed value among previously reported superconductors,
indicating the strong-coupling superconductivity. The electronic specific heat
coefficient at $T_{\rm sc}$ is, however, approximately unchanged as a function
of pressure, even at $P_{\rm c}$.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:06:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tateiwa",
"Naoyuki",
""
],
[
"Haga",
"Yoshinori",
""
],
[
"Matsuda",
"Tatsuma D.",
""
],
[
"Ikeda",
"Shugo",
""
],
[
"Yamamoto",
"Etsuji",
""
],
[
"Okuda",
"Yusuke",
""
],
[
"Miyauchi",
"Yuichiro",
""
],
[
"Settai",
"Rikio",
""
],
[
"Onuki",
"Yoshichika",
""
]
] |
0706.4399 | Elena Ferraro | E. Ferraro, A. Napoli, A. Messina | A criterion for entanglement in two two-level systems | 4 pages, Submitted to Physical Review Letters | J. Phys. A: Math. Theor. 40 (2007) F935-F941 | null | null | quant-ph | null | We prove a necessary and sufficient condition for the occurrence of
entanglement in two two-level systems, simple enough to be of experimental
interest. Our results are illustrated in the context of a spin star system
analyzing the exact entanglement evolution of the central couple of spins.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:15:11 GMT"
}
] | 2007-10-09T00:00:00 | [
[
"Ferraro",
"E.",
""
],
[
"Napoli",
"A.",
""
],
[
"Messina",
"A.",
""
]
] |
0706.4400 | Petar Grujic Mr | V. Djokovic and P. Grujic | Albert Einstein - a Pious Atheist | 21 pages, 0 figures, | null | null | null | physics.hist-ph physics.gen-ph | null | We consider Einstein's attitude with regard to religion both from
sociological and epistemological points of view. An attempt to put it into a
wider socio-historical perspective has been made, with the emphasis on his
ethnic and religious background. The great scientist was neither anatheist nor
a believer in the orthodox sense and the closest labels one might apply would
be pantheism/cosmism (ontological view) and agnosticism (epistemological view).
His ideas on the divine could be considered as a continuation of a line that
can be traced back to Philo of Alexandria, who himself followed the Greek
Stoics and Neoplatonists and especially Baruch Spinoza. Einstein's scientific
(or rational) and religious (or intuitive) thinking was deeply rooted in the
Hellenic culture.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:15:47 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Djokovic",
"V.",
""
],
[
"Grujic",
"P.",
""
]
] |
0706.4401 | Hans Fogedby | Hans C. Fogedby and Ralf Metzler | Dynamics of DNA-breathing: Weak noise analysis, finite time singularity,
and mapping onto the quantum Coulomb problem | 12 pages, 10 figures, revtex | Phys. Rev. E 76, 061915 (2007) | 10.1103/PhysRevE.76.061915 | null | cond-mat.stat-mech cond-mat.soft | null | We study the dynamics of denaturation bubbles in double-stranded DNA on the
basis of the Poland-Scheraga model. We show that long time distributions for
the survival of DNA bubbles and the size autocorrelation function can be
derived from an asymptotic weak noise approach. In particular, below the
melting temperature the bubble closure corresponds to a noisy finite time
singularity. We demonstrate that the associated Fokker-Planck equation is
equivalent to a quantum Coulomb problem. Below the melting temperature the
bubble lifetime is associated with the continuum of scattering states of the
repulsive Coulomb potential; at the melting temperature the Coulomb potential
vanishes and the underlying first exit dynamics exhibits a long time power law
tail; above the melting temperature, corresponding to an attractive Coulomb
potential, the long time dynamics is controlled by the lowest bound state.
Correlations and finite size effects are discussed.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:16:52 GMT"
}
] | 2008-06-02T00:00:00 | [
[
"Fogedby",
"Hans C.",
""
],
[
"Metzler",
"Ralf",
""
]
] |
0706.4402 | Ludovico Carbone | L. Carbone, A. Cavalleri, G. Ciani, R. Dolesi, M. Hueller, D.
Tombolato, S. Vitale, and W. J. Weber | Thermal gradient-induced forces on geodetic reference masses for LISA | 21 pages, 16 figures, submitted to Physical Review D | Phys.Rev.D76:102003,2007 | 10.1103/PhysRevD.76.102003 | null | gr-qc | null | The low frequency sensitivity of space-borne gravitational wave observatories
will depend critically on the geodetic purity of the trajectories of orbiting
test masses. Fluctuations in the temperature difference across the enclosure
surrounding the free-falling test mass can produce noisy forces through several
processes, including the radiometric effect, radiation pressure, and
outgassing. We present here a detailed experimental investigation of thermal
gradient-induced forces for the LISA gravitational wave mission and the LISA
Pathfinder, employing high resolution torsion pendulum measurements of the
torque on a LISA-like test mass suspended inside a prototype of the LISA
gravitational reference sensor that will surround the test mass in orbit. The
measurement campaign, accompanied by numerical simulations of the radiometric
and radiation pressure effects, allows a more accurate and representative
characterization of thermal-gradient forces in the specific geometry and
environment relevant to LISA free-fall. The pressure dependence of the measured
torques allows clear identification of the radiometric effect, in quantitative
agreement with the model developed. In the limit of zero gas pressure, the
measurements are most likely dominated by outgassing, but at a low level that
does not threaten the LISA sensitivity goals.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 13:29:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Carbone",
"L.",
""
],
[
"Cavalleri",
"A.",
""
],
[
"Ciani",
"G.",
""
],
[
"Dolesi",
"R.",
""
],
[
"Hueller",
"M.",
""
],
[
"Tombolato",
"D.",
""
],
[
"Vitale",
"S.",
""
],
[
"Weber",
"W. J.",
""
]
] |
0706.4403 | Bertrand Eynard | Bertrand Eynard (SPhT) | Recursion between Mumford volumes of moduli spaces | Latex, 18 pages | null | null | SPHT-T07/104 | math.AG hep-th math-ph math.MP | null | We propose a new proof, as well as a generalization of Mirzakhani's recursion
for volumes of moduli spaces. We interpret those recursion relations in terms
of expectation values in Kontsevich's integral, i.e. we relate them to a Ribbon
graph decomposition of Riemann surfaces. We find a generalization of
Mirzakhani's recursions to measures containing all higher Mumford's kappa
classes, and not only kappa1 as in the Weil-Petersson case.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:46:44 GMT"
}
] | 2007-07-10T00:00:00 | [
[
"Eynard",
"Bertrand",
"",
"SPhT"
]
] |
0706.4404 | Bakmaev Sabir | E.A. Kuraev, S. Bakmaev, V. Bytev, E. Kokoulina | Muon multiplicity at high energy proton-nuclei collisions | 8pages | null | null | null | hep-ph | null | Estimation of multiplicity of muons and pions production at high energy
proton-nuclei collisions is given. Both QED and QCD contributions are
considered for peripheral kinematics of muon pair and $\sigma$-meson
production, keeping in mind it's final conversion to muons. An attempt to
explain the excess of positive charged muons compared to negative one in cosmic
muon showers is given.
We derive the dependence of cross-section of $n$ pairs as a function of $n$
at large n as $d^n(n!n^2)^{-1}$.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:47:22 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Kuraev",
"E. A.",
""
],
[
"Bakmaev",
"S.",
""
],
[
"Bytev",
"V.",
""
],
[
"Kokoulina",
"E.",
""
]
] |
0706.4405 | Jan Meinderts Swart | Anja Sturm and Jan M. Swart | Tightness of voter model interfaces | Corrected a serious error in Lemma 3. Some additional insignificant
corrections. 9 pages | null | null | null | math.PR | null | Consider a long-range, one-dimensional voter model started with all zeroes on
the negative integers and all ones on the positive integers. If the process
obtained by identifying states that are translations of each other is
positively recurrent, then it is said that the voter model exhibits interface
tightness. In 1995, Cox and Durrett proved that one-dimensional voter models
exhibit interface tightness if their infection rates have a finite third
moment. Recently, Belhaouari, Mountford, and Valle have improved this by
showing that a finite second moment suffices. The present paper gives a new
short proof of this fact. We also prove interface tightness for a long range
swapping voter model, which has a mixture of long range voter model and
exclusion process dynamics.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:54:57 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jul 2007 08:59:14 GMT"
}
] | 2007-07-11T00:00:00 | [
[
"Sturm",
"Anja",
""
],
[
"Swart",
"Jan M.",
""
]
] |
0706.4406 | Ramin Golestanian | Jonathan R. Howse, Richard A.L. Jones, Anthony J. Ryan, Tim Gough,
Reza Vafabakhsh, and Ramin Golestanian | Self-motile colloidal particles: from directed propulsion to random walk | This is an experimental paper, due to appear in Phys. Rev. Lett.
(2007) | null | 10.1103/PhysRevLett.99.048102 | null | cond-mat.soft cond-mat.stat-mech | null | The motion of an artificial micro-scale swimmer that uses a chemical reaction
catalyzed on its own surface to achieve autonomous propulsion is fully
characterized experimentally. It is shown that at short times, it has a
substantial component of directed motion, with a velocity that depends on the
concentration of fuel molecules. At longer times, the motion reverts to a
random walk with a substantially enhanced diffusion coefficient. Our results
suggest strategies for designing artificial chemotactic systems.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 12:56:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Howse",
"Jonathan R.",
""
],
[
"Jones",
"Richard A. L.",
""
],
[
"Ryan",
"Anthony J.",
""
],
[
"Gough",
"Tim",
""
],
[
"Vafabakhsh",
"Reza",
""
],
[
"Golestanian",
"Ramin",
""
]
] |
0706.4407 | Diederik Roest | Ulf Gran, George Papadopoulos, Diederik Roest | Supersymmetric heterotic string backgrounds | 12 pages, v2: gauge theory applications are stressed and references
added | Phys.Lett.B656:119-126,2007 | 10.1016/j.physletb.2007.09.024 | null | hep-th | null | We present the main features of the solution of the gravitino and dilatino
Killing spinor equations derived in hep-th/0510176 and hep-th/0703143 which
have led to the classification of geometric types of all type I backgrounds. We
then apply these results to the supersymmetric backgrounds of the heterotic
string. In particular, we solve the gaugino Killing spinor equation together
with the other two Killing spinor equations of the theory. We also use our
results to classify all supersymmetry conditions of ten-dimensional gauge
theory.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 13:07:16 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 12:56:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gran",
"Ulf",
""
],
[
"Papadopoulos",
"George",
""
],
[
"Roest",
"Diederik",
""
]
] |
0706.4408 | Martin Weigel | Martin Weigel | Genetic embedded matching approach to ground states in continuous-spin
systems | 17 pages, 12 figures, 1 table | Phys. Rev. E 76, 066706 (2007) | 10.1103/PhysRevE.76.066706 | null | cond-mat.dis-nn cond-mat.stat-mech | null | Due to an extremely rugged structure of the free energy landscape, the
determination of spin-glass ground states is among the hardest known
optimization problems, found to be NP-hard in the most general case. Owing to
the specific structure of local (free) energy minima, general-purpose
optimization strategies perform relatively poorly on these problems, and a
number of specially tailored optimization techniques have been developed in
particular for the Ising spin glass and similar discrete systems. Here, an
efficient optimization heuristic for the much less discussed case of continuous
spins is introduced, based on the combination of an embedding of Ising spins
into the continuous rotators and an appropriate variant of a genetic algorithm.
Statistical techniques for insuring high reliability in finding (numerically)
exact ground states are discussed, and the method is benchmarked against the
simulated annealing approach.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 13:07:24 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2007 09:20:55 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Weigel",
"Martin",
""
]
] |
0706.4409 | Robert Vertesi | R. Vertesi (for the PHENIX Collaboration) | THERMINATOR simulations and PHENIX images of a heavy tail of particle
emission in 200 GeV Au+Au collisions | To appear in the proceedings of 23rd Winter Workshop on Nuclear
Dynamics, Big Sky, Montana, 11-18 Feb 2007 | null | null | null | nucl-th | null | Correlation between emitted particles from a thermalized medium carry
important information about the space-time extent and the dynamics of the
particle emitting source. Pion emission source functions S(r) have been
measured in PHENIX using an imaging technique, and it has been found that it
contains a heavy (power-law) tail. It leads us to the assumption that there is
a halo of secondary pions, surrounding the core system that undergoes the
hydrodynamical evolution. THERMINATOR, a Monte Carlo event generator designed
for studies in relativistic heavy-ion collisions is used to model and
investigate the influence of resonance decays on the tail of particle emission
source. It lacks the implementation of rescattering, which, as we have learnt
from previous Hadron Rescattering Code simulations, is a possible explanation
of the power-law tail. Our studies also have shown that none of the pion
sources alone are responsible for the tail: either the resonance decays or
rescattering or a combination of these effects is a possible cause of the heavy
tail.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 13:28:12 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Vertesi",
"R.",
"",
"for the PHENIX Collaboration"
]
] |
0706.4410 | Spiros Evangelou | Yue Yin and S. N. Evangelou | Environment-Mediated Quantum State Transfer | 6 pages and 5 figures | null | 10.1088/1751-8113/41/8/085306 | null | quant-ph | null | We propose a scheme for quantum state transfer(QST) between two qubits which
is based on their individual interaction with a common boson environment. The
corresponding single mode spin-boson Hamiltonian is solved by mapping it onto a
wave propagation problem in a semi-infinite ladder and the fidelity is
obtained. High fidelity occurs when the qubits are equally coupled to the boson
while the fidelity becomes smaller for nonsymmetric couplings. The complete
phase diagram for such an arbitrary QST mediated by bosons is discussed.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 13:37:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yin",
"Yue",
""
],
[
"Evangelou",
"S. N.",
""
]
] |
0706.4411 | Andrej Zlatos | Alexander Kiselev, Roman Shterenberg, Andrej Zlatos | Relaxation Enhancement by Time-Periodic Flows | 11 pp | null | null | null | math.AP math.FA math.SP | null | We study enhancement of diffusive mixing by fast incompressible time-periodic
flows. The class of relaxation-enhancing flows that are especially efficient in
speeding up mixing has been introduced in [2]. The relaxation-enhancing
property of a flow has been shown to be intimately related to the properties of
the dynamical system it generates. In particular, time-independent flows $u$
such that the operator $u \cdot \nabla$ has sufficiently smooth eigenfunctions
are not relaxation-enhancing. Here we extend results of [2] to time-periodic
flows $u(x,t)$ and in particular show that there exist flows such that for each
fixed time the flow is Hamiltonian, but the resulting time-dependent flow is
relaxation-enhancing. Thus we confirm the physical intuition that time
dependence of a flow may aid mixing. We also provide an extension of our
results to the case of a nonlinear diffusion model. The proofs are based on a
general criterion for the decay of a semigroup generated by an operator of the
form $\Gamma+iAL(t)$ with a negative unbounded self-adjoint operator $\Gamma$,
a time-periodic self-adjoint operator-valued function $L(t)$, and a parameter
$A>>1$.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 13:43:08 GMT"
}
] | 2007-07-02T00:00:00 | [
[
"Kiselev",
"Alexander",
""
],
[
"Shterenberg",
"Roman",
""
],
[
"Zlatos",
"Andrej",
""
]
] |
0706.4412 | Wim van Dam | Wim van Dam, G. Mauro D'Ariano, Artur Ekert, Chiara Macchiavello,
Michele Mosca | Optimal phase estimation in quantum networks | 9 pages, 2 figures; this is an extended version of
arXiv:quant-ph/0609160. v2: minor corrections in references | Journal of Physics A: Mathematical and Theoretical, Volume 40,
pages 7971-7984 (2007) | 10.1088/1751-8113/40/28/S07 | null | quant-ph | null | We address the problem of estimating the phase phi given N copies of the
phase rotation u(phi) within an array of quantum operations in finite
dimensions. We first consider the special case where the array consists of an
arbitrary input state followed by any arrangement of the N phase rotations, and
ending with a POVM. We optimise the POVM for a given input state and fixed
arrangement. Then we also optimise the input state for some specific cost
functions. In all cases, the optimal POVM is equivalent to a quantum Fourier
transform in an appropriate basis. Examples and applications are given.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 18:58:11 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Aug 2007 00:45:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"van Dam",
"Wim",
""
],
[
"D'Ariano",
"G. Mauro",
""
],
[
"Ekert",
"Artur",
""
],
[
"Macchiavello",
"Chiara",
""
],
[
"Mosca",
"Michele",
""
]
] |
0706.4413 | Mayeul Arminjon | Mayeul Arminjon | Quantum wave equations in curved space-time from wave mechanics | 3 pages in 12pt LaTeX. Text of a talk given at the conference
"Symmetry and Perturbation Theory", 2-9 June 2007, Otranto (Italy). Submitted
to the Proceedings (G. Gaeta and Raff. Vitolo, eds, World Scientific) | null | 10.1142/9789812776174_0031 | null | gr-qc | null | Alternative versions of the Klein-Gordon and Dirac equations in a curved
spacetime are got by applying directly the classical-quantum correspondence.
| [
{
"version": "v1",
"created": "Fri, 29 Jun 2007 14:00:36 GMT"
}
] | 2016-11-23T00:00:00 | [
[
"Arminjon",
"Mayeul",
""
]
] |
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