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list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.0514 | Johannes Walcher | Katrin Becker, Melanie Becker, Johannes Walcher | Runaway in the Landscape | 26 pages | Phys.Rev.D76:106002,2007 | 10.1103/PhysRevD.76.106002 | null | hep-th | null | We consider flux compactifications of type IIB string theory on the mirror of
a rigid Calabi-Yau. In special cases, these models are dual to the type IIA
flux vacua with runaway direction in flux space. We show that new weak coupling
AdS solutions can be found for large complex structure, while Minkowski
solutions with all moduli stabilized are confined to be at strong coupling. The
existence of these solutions, as found in a previous work, is nevertheless
guaranteed by a non-renormalization theorem of the type IIB flux
superpotential. Based on our results, we are led to the conjecture that
supersymmetric runaway directions in flux space are always accompanied by a
spectrum of moduli masses reaching down to the AdS scale. This could be
violated in a non-supersymmetric situation.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 15:01:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Becker",
"Katrin",
""
],
[
"Becker",
"Melanie",
""
],
[
"Walcher",
"Johannes",
""
]
] |
0706.0515 | Andrew Mshar | Andrew C. Mshar, Jane C. Charlton, Ryan S. Lynch, Chris Churchill,
Tae-Sun Kim | The Kinematic Evolution of Strong MgII Absorbers | Accepted to the Astrophysical Journal | null | 10.1086/520792 | null | astro-ph | null | We consider the evolution of strong (W_r(2796) > 0.3A) MgII absorbers, most
of which are closely related to luminous galaxies. Using 20 high resolution
quasar spectra from the VLT/UVES public archive, we examine 33 strong MgII
absorbers in the redshift range 0.3 < z < 2.5. We compare and supplement this
sample with 23 strong MgII absorbers at 0.4 < z < 1.4 observed previously with
HIRES/Keck. We find that neither equivalent width nor kinematic spread (the
optical depth weighted second moment of velocity) of MgII2796 evolve. However,
the kinematic spread is sensitive to the highest velocity component, and
therefore not as sensitive to additional weak components at intermediate
velocities relative to the profile center. The fraction of absorbing pixels
within the full velocity range of the system does show a trend of decreasing
with decreasing redshift. Most high redshift systems (14/20) exhibit absorption
over the entire system velocity range, which differs from the result for low
redshift systems (18/36) at the 95% level. This leads to a smaller number of
separate subsystems for high redshift systems because weak absorping components
tend to connect the stronger regions of absorption. We hypothesize that low
redshift MgII profiles are more likely to represent well formed galaxies, many
of which have kinematics consistent with a disk/halo structure. High redshift
MgII profiles are more likely to show evidence of complex protogalactic
structures, with multiple accretion or outflow events. Although these results
are derived from measurements of gas kinematics, they are consistent with
hierarchical galaxy formation evidenced by deep galaxy surveys.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:00:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mshar",
"Andrew C.",
""
],
[
"Charlton",
"Jane C.",
""
],
[
"Lynch",
"Ryan S.",
""
],
[
"Churchill",
"Chris",
""
],
[
"Kim",
"Tae-Sun",
""
]
] |
0706.0516 | Joshua Simon | Joshua D. Simon (Caltech) and Marla Geha (HIA/DAO) | The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the
Missing Satellite Problem | 22 pages, 15 figures (12 in color), 6 tables, minor revisions in
response to referee report. Accepted for publication in ApJ | Astrophys.J.670:313-331,2007 | 10.1086/521816 | null | astro-ph | null | We present Keck/DEIMOS spectroscopy of stars in 8 of the newly discovered
ultra-faint dwarf galaxies around the Milky Way. We measure the velocity
dispersions of Canes Venatici I and II, Ursa Major I and II, Coma Berenices,
Hercules, Leo IV and Leo T from the velocities of 18 - 214 stars in each galaxy
and find dispersions ranging from 3.3 to 7.6 km/s. The 6 galaxies with absolute
magnitudes M_V < -4 are highly dark matter-dominated, with mass-to-light ratios
approaching 1000. The measured velocity dispersions are inversely correlated
with their luminosities, indicating that a minimum mass for luminous galactic
systems may not yet have been reached. We also measure the metallicities of the
observed stars and find that the 6 brightest of the ultra-faint dwarfs extend
the luminosity-metallicity relationship followed by brighter dwarfs by 2 orders
of magnitude in luminosity; several of these objects have mean metallicities as
low as [Fe/H] = -2.3 and therefore represent some of the most metal-poor known
stellar systems. We detect metallicity spreads of up to 0.5 dex in several
objects, suggesting multiple star formation epochs. Having established the
masses of the ultra-faint dwarfs, we re-examine the missing satellite problem.
After correcting for the sky coverage of the SDSS, we find that the ultra-faint
dwarfs substantially alleviate the discrepancy between the predicted and
observed numbers of satellites around the Milky Way, but there are still a
factor of ~4 too few dwarf galaxies over a significant range of masses. We show
that if galaxy formation in low-mass dark matter halos is strongly suppressed
after reionization, the simulated circular velocity function of CDM subhalos
can be brought into approximate agreement with the observed circular velocity
function of Milky Way satellite galaxies. [slightly abridged]
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:23:02 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 04:58:37 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Simon",
"Joshua D.",
"",
"Caltech"
],
[
"Geha",
"Marla",
"",
"HIA/DAO"
]
] |
0706.0517 | Luis Anchordoqui | Luis A. Anchordoqui, John F. Beacom, Yousaf M. Butt, Haim Goldberg,
Sergio Palomares-Ruiz, Thomas J. Weiler, and Justin Wesolowski | TeV gamma-rays from photo-disintegration/de-excitation of nuclei in
Westerlund 2 | To be published in Proceedings of the 30th International Cosmic Ray
Conference, July 3 - 11, 2007, Merida, Yucatan, Mexico | null | null | null | astro-ph | null | TeV gamma-rays can result from the photo-de-excitation of PeV cosmic ray
nuclei after their parents have undergone photo-disintegration in an
environment of ultraviolet photons. This process is proposed as a candidate
explanation of the recently discovered HESS source at the edge of Westerlund 2.
The UV background is provided by Lyman-alpha emission within the rich O and B
stellar environment. The HESS flux results if there is efficient acceleration
at the source of lower energy nuclei. The requirement that the Lorentz-boosted
ultraviolet photons reach the Giant Dipole resonant energy (~ 20 MeV) implies a
strong suppression of the gamma-ray spectrum compared to an E_\gamma^{-2}
behavior at energies below about 1 TeV. This suppression is not apparent in the
lowest-energy Westerlund 2 datum, but will be probed by the upcoming GLAST
mission.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 01:00:35 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Beacom",
"John F.",
""
],
[
"Butt",
"Yousaf M.",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Palomares-Ruiz",
"Sergio",
""
],
[
"Weiler",
"Thomas J.",
""
],
[
"Wesolowski",
"Justin",
""
]
] |
0706.0518 | Andrew Wetzel | Andrew R. Wetzel, A.E. Schulz, Daniel E. Holz, Michael S. Warren | Close Pairs as Proxies for Galaxy Cluster Mergers | 12 pages, 9 figures; Accepted for publication in ApJ. Significant
additions to text and two figures changed. Added new findings on the
universality of pair mergers and added analysis of the effect of FoF linking
length on halo mergers | null | 10.1086/589731 | null | astro-ph | null | Galaxy cluster merger statistics are an important component in understanding
the formation of large-scale structure. Unfortunately, it is difficult to study
merger properties and evolution directly because the identification of cluster
mergers in observations is problematic. We use large N-body simulations to
study the statistical properties of massive halo mergers, specifically
investigating the utility of close halo pairs as proxies for mergers. We
examine the relationship between pairs and mergers for a wide range of merger
timescales, halo masses, and redshifts (0<z<1). We also quantify the utility of
pairs in measuring merger bias. While pairs at very small separations will
reliably merge, these constitute a small fraction of the total merger
population. Thus, pairs do not provide a reliable direct proxy to the total
merger population. We do find an intriguing universality in the relation
between close pairs and mergers, which in principle could allow for an estimate
of the statistical merger rate from the pair fraction within a scaled
separation, but including the effects of redshift space distortions strongly
degrades this relation. We find similar behavior for galaxy-mass halos, making
our results applicable to field galaxy mergers at high redshift. We investigate
how the halo merger rate can be statistically described by the halo mass
function via the merger kernel (coagulation), finding an interesting
environmental dependence of merging: halos within the mass resolution of our
simulations merge less efficiently in overdense environments. Specifically,
halo pairs with separations less than a few Mpc/h are more likely to merge in
underdense environments; at larger separations, pairs are more likely to merge
in overdense environments.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:01:15 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Apr 2008 20:30:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wetzel",
"Andrew R.",
""
],
[
"Schulz",
"A. E.",
""
],
[
"Holz",
"Daniel E.",
""
],
[
"Warren",
"Michael S.",
""
]
] |
0706.0519 | Tommaso Treu | Tommaso Treu (1), Jong-Hak Woo (1), Matthew A. Malkan (2), Roger D.
Blandford (3) ((1) UCSB; (2) UCLA; (3) Stanford) | Cosmic Evolution of Black Holes and Spheroids. II: Scaling Relations at
z=0.36 | 17 pages, 10 figures; accepted for publication in the Astrophysical
Journal | Astrophys.J.667:117-130,2007 | 10.1086/520633 | null | astro-ph | null | We combine Hubble Space Telescope images of a sample of 20 Seyfert galaxies
at z=0.36 with spectroscopic information from the Keck Telescope to determine
the black hole mass - spheroid luminosity relation (M-L), the Fundamental Plane
(FP) of the host galaxies and the M-sigma relation. Assuming pure luminosity
evolution, we find that the host spheroids had smaller luminosity and stellar
velocity dispersion than today for a fixed M. The offsets correspond to Delta
log L_B,0=0.40+-0.11+-0.15 (Delta log M = 0.51+-0.14+-0.19) and Delta log sigma
= 0.13+-0.03+-0.05 (Delta log M = 0.54+-0.12+-0.21), respectively for the M-L
and M-sigma relation. A detailed analysis of known systematic errors and
selection effects shows that they cannot account for the observed offset. The
data are inconsistent with pure luminosity evolution and the existence of
universal and tight scaling relations. To obey the three local scaling
relations by z=0 the distant spheroids have to grow their stellar mass by
approximately 60% (\Delta log M_sph=0.20+-0.14) in the next 4 billion years.
The measured evolution can be expressed as M/ M_sph ~ (1+z)^{1.5+-1.0}. Based
on the disturbed morphologies of a fraction of the sample (6/20) we suggest
collisional mergers with disk-dominated systems as evolutionary mechanism.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:06:41 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Treu",
"Tommaso",
"",
"UCSB;"
],
[
"Woo",
"Jong-Hak",
"",
"UCSB;"
],
[
"Malkan",
"Matthew A.",
"",
"UCLA;"
],
[
"Blandford",
"Roger D.",
"",
"Stanford"
]
] |
0706.0520 | Martin White | Charlie Conroy, Shirley Ho and Martin White | Constraints on the merging timescale of luminous red galaxies, or, where
do all the halos go? | 8 pages, 4 figures, final version, to appear in MNRAS | Mon.Not.Roy.Astron.Soc.379:1491-1497,2007 | 10.1111/j.1365-2966.2007.12033.x | null | astro-ph | null | In the LCDM cosmology dark matter halos grow primarily through the accretion
of smaller halos. Much of the mass in a halo of 10^14Msun comes in through
accretion of ~10^13Msun halos. If each such halo hosted one luminous red galaxy
(LRG) then the accretion of so many halos is at odds with the observed number
of LRGs in clusters unless these accreted LRGs merge or disrupt on relatively
short timescales (~2Gyr). These timescales are consistent with classical
dynamical friction arguments, and imply that 2-3 LRGs have merged or disrupted
within each halo more massive than 10^14Msun by z=0. The total amount of
stellar mass brought into these massive halos by z=0 is consistent with
observations once the intracluster light (ICL) is included. If disrupted LRGs
build up the ICL, then the hierarchical growth of massive halos implies that a
substantial amount of ICL should also surround satellite LRGs, as suggested by
recent observations of the Virgo cluster. Finally, we point out that these
results are entirely consistent with a non-evolving clustering strength and
halo occupation distribution, and note that observations of the latter in fact
support the hypothesis that merging/disruption of massive galaxies does indeed
take place at late times.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:02:55 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 13:05:23 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Conroy",
"Charlie",
""
],
[
"Ho",
"Shirley",
""
],
[
"White",
"Martin",
""
]
] |
0706.0521 | Andrew Haynes | Andrew L. Haynes (1), Clare E. Parnell (1) ((1) University of St
Andrews) | A trilinear method for finding null points in a 3D vector space | 12 pages, 4 figures, submitted to Physics of Plasmas | null | 10.1063/1.2756751 | null | astro-ph | null | Null points are important locations in vector fields, such as a magnetic
field. A new technique (a trilinear method for finding null points) is
presented for finding null points over a large grid of points, such as those
derived from a numerical experiment. The method was designed so that the null
points found would agree with any fieldlines traced using the commonly used
trilinear interpolation. It is split into three parts: reduction, analysis and
positioning, which, when combined, provide an efficient means of locating null
points to a user-defined sub-grid accuracy. We compare the results of the
trilinear method with that of a method based on the Poincare index, and discuss
the accuracy and limitations of both methods.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:12:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Haynes",
"Andrew L.",
""
],
[
"Parnell",
"Clare E.",
""
]
] |
0706.0522 | Roman Lutchyn | R. M. Lutchyn and L. I. Glazman | Energy relaxation of superconducting charge qubit via Andreev processes | 6 pages, 4 figures (accepted to Phys. Rev. B) | Phys. Rev. B 76, 104507 (2007) | 10.1103/PhysRevB.76.104507 | null | cond-mat.supr-con cond-mat.mes-hall | null | We study fundamental limitations on the energy relaxation rate of a
superconducting charge qubit with a large-gap Cooper-pair box, $\Delta_b >
\Delta_r$. At a sufficiently large mismatch between the gap energies in the box
$\Delta_b$ and in the reservoir $\Delta_r$,"quasiparticle poisoning" becomes
ineffective even in the presence of nonequilibrium quasiparticles in the
reservoir. The qubit relaxation still may occur due to higher-order (Andreev)
processes. In this paper we evaluate the qubit energy relaxation rate due to
Andreev processes.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:03:36 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Aug 2007 23:32:48 GMT"
}
] | 2007-09-12T00:00:00 | [
[
"Lutchyn",
"R. M.",
""
],
[
"Glazman",
"L. I.",
""
]
] |
0706.0523 | Ranjit Jhala | Ranjit Jhala, Kenneth L. McMillan | Interpolant-Based Transition Relation Approximation | Conference Version at CAV 2005. 17 Pages, 9 Figures | Logical Methods in Computer Science, Volume 3, Issue 4 (November
1, 2007) lmcs:1152 | 10.2168/LMCS-3(4:1)2007 | null | cs.LO cs.PL cs.SE | null | In predicate abstraction, exact image computation is problematic, requiring
in the worst case an exponential number of calls to a decision procedure. For
this reason, software model checkers typically use a weak approximation of the
image. This can result in a failure to prove a property, even given an adequate
set of predicates. We present an interpolant-based method for strengthening the
abstract transition relation in case of such failures. This approach guarantees
convergence given an adequate set of predicates, without requiring an exact
image computation. We show empirically that the method converges more rapidly
than an earlier method based on counterexample analysis.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:07:54 GMT"
},
{
"version": "v2",
"created": "Thu, 1 Nov 2007 17:00:23 GMT"
}
] | 2015-07-01T00:00:00 | [
[
"Jhala",
"Ranjit",
""
],
[
"McMillan",
"Kenneth L.",
""
]
] |
0706.0524 | Sangwook Park | Sangwook Park (Penn State), Patrick O. Slane (CfA), John P. Hughes
(Rutgers), Koji Mori (Miyazaki), David N. Burrows, and Gordon P. Garmire
(Penn State) | Chandra X-Ray Study of Galactic Supernova Remnant G299.2-2.9 | 16 pages (AASTex emulator style), 3 Tables, 10 Figures (including 1
color: Figure 1), Accepted by ApJ | Astrophys.J.665:1173-1181,2007 | 10.1086/520105 | null | astro-ph | null | We report on observations of the Galactic supernova remnant (SNR)
G299.2$-$2.9 with the {\it Chandra X-Ray Observatory}. The high resolution
images with {\it Chandra} resolve the X-ray-bright knots, shell, and diffuse
emission extending beyond the bright shell. Interior to the X-ray shell is
faint diffuse emission occupying the central regions of the SNR.
Spatially-resolved spectroscopy indicates a large foreground absorption
($N_{\rm H}$ $\sim$ 3.5 $\times$ 10$^{21}$ cm$^{-2}$), which supports a
relatively distant location ($d$ $\sim$ 5 kpc) for the SNR. The blast wave is
encountering a highly inhomogeneous ambient medium with the densities ranging
over more than an order of magnitude ($n_0$ $\sim$ 0.1 $-$ 4 cm$^{-3}$).
Assuming the distance of $d$ $\sim$ 5 kpc, we derive a Sedov age of $\tau$
$\sim$ 4500 yr and an explosion energy of $E_0$ $\sim$ 1.6 $\times$ 10$^{50}$
ergs. The ambient density structure and the overall morphology suggest that
G299.2$-$2.9 may be a limb-brightened partial shell extending to $\sim$7 pc
radius surrounded by fainter emission extending beyond that to a radius of
$\sim$9 pc. This suggests the SNR exploded in a region of space where there is
a density gradient whose direction lies roughly along the line of sight. The
faint central region shows strong line emission from heavy elements of Si and
Fe, which is caused by the presence of the overabundant stellar ejecta there.
We find no evidence for stellar ejecta enriched in light elements of O and Ne.
The observed abundance structure of the metal-rich ejecta supports a Type Ia
origin for G299.2$-$2.9.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:08:07 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Park",
"Sangwook",
"",
"Penn State"
],
[
"Slane",
"Patrick O.",
"",
"CfA"
],
[
"Hughes",
"John P.",
"",
"Rutgers"
],
[
"Mori",
"Koji",
"",
"Miyazaki"
],
[
"Burrows",
"David N.",
"",
"Penn State"
],
[
"Garmire",
"Gordon P.",
"",
"Penn State"
]
] |
0706.0525 | Luk Arnaut PhD | L. R. Arnaut | Nonstationary random acoustic and electromagnetic fields as wave
diffusion processes | 54 pages, 8 figures, to appear in J. Phys. A: Math. Theor | null | 10.1088/1751-8113/40/27/022 | null | physics.class-ph physics.optics | null | We investigate the effects of relatively rapid variations of the boundaries
of an overmoded cavity on the stochastic properties of its interior acoustic or
electromagnetic field. For quasi-static variations, this field can be
represented as an ideal incoherent and statistically homogeneous isotropic
random scalar or vector field, respectively. A physical model is constructed
showing that the field dynamics can be characterized as a generalized diffusion
process. The Langevin--It\^{o} and Fokker--Planck equations are derived and
their associated statistics and distributions for the complex analytic field,
its magnitude and energy density are computed. The energy diffusion parameter
is found to be proportional to the square of the ratio of the standard
deviation of the source field to the characteristic time constant of the
dynamic process, but is independent of the initial energy density, to first
order. The energy drift vanishes in the asymptotic limit. The time-energy
probability distribution is in general not separable, as a result of
nonstationarity. A general solution of the Fokker--Planck equation is obtained
in integral form, together with explicit closed-form solutions for several
asymptotic cases. The findings extend known results on statistics and
distributions of quasi-stationary ideal random fields (pure diffusions), which
are retrieved as special cases.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:09:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Arnaut",
"L. R.",
""
]
] |
0706.0526 | Geraldine Servant | Genevieve Belanger, Alexander Pukhov and Geraldine Servant | Dirac Neutrino Dark Matter | 35 pages, 25 figures; v2: JCAP version; presentation and plots
improved, results unchanged | JCAP 0801:009,2008 | 10.1088/1475-7516/2008/01/009 | LAPTH-1184-07, CERN-PH-TH/2007-083 | hep-ph astro-ph | null | We investigate the possibility that dark matter is made of heavy Dirac
neutrinos with mass in the range [O(1) GeV- a few TeV] and with suppressed but
non-zero coupling to the Standard Model Z as well as a coupling to an
additional Z' gauge boson. The first part of this paper provides a
model-independent analysis for the relic density and direct detection in terms
of four main parameters: the mass, the couplings to the Z, to the Z' and to the
Higgs. These WIMP candidates arise naturally as Kaluza-Klein states in
extra-dimensional models with extended electroweak gauge group SU(2)_L* SU(2)_R
* U(1). They can be stable because of Kaluza-Klein parity or of other discrete
symmetries related to baryon number for instance, or even, in the low mass and
low coupling limits, just because of a phase-space-suppressed decay width. An
interesting aspect of warped models is that the extra Z' typically couples only
to the third generation, thus avoiding the usual experimental constraints. In
the second part of the paper, we illustrate the situation in details in a
warped GUT model.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:15:54 GMT"
},
{
"version": "v2",
"created": "Sun, 16 Dec 2007 21:30:02 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Belanger",
"Genevieve",
""
],
[
"Pukhov",
"Alexander",
""
],
[
"Servant",
"Geraldine",
""
]
] |
0706.0527 | Christy Tremonti | Christy A. Tremonti (1), John Moustakas (2) and Aleksandar M.
Diamond-Stanic (1) ((1) Steward Observatory, (2) New York University) | The Discovery of 1000 km/s Outflows in Massive Post-starburst Galaxies
at z=0.6 | 5 pages, 2 figures, accepted to ApJ Letters | null | 10.1086/520083 | null | astro-ph | null | Numerical simulations suggest that active galactic nuclei (AGNs) play an
important role in the formation of early-type galaxies by expelling gas and
dust in powerful galactic winds and quenching star formation. However, the
existence of AGN feedback capable of halting galaxy-wide star formation has yet
to be observationally confirmed. To investigate this question, we have obtained
spectra of 14 post-starburst galaxies at z~0.6 to search for evidence of
galactic winds. In 10/14 galaxies we detect Mg II 2796,2803 absorption lines
which are blueshifted by 490 - 2020 km/s with respect to the stars. The median
blueshift is 1140 km/s. We hypothesize that the outflowing gas represents a
fossil galactic wind launched near the peak of the galaxy's activity, a few 100
Myr ago. The velocities we measure are intermediate between those of luminous
starbursts and broad absorption line quasars, which suggests that feedback from
an AGN may have played a role in expelling cool gas and shutting down star
formation.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:36:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tremonti",
"Christy A.",
"",
"Steward Observatory"
],
[
"Moustakas",
"John",
"",
"New York University"
],
[
"Diamond-Stanic",
"Aleksandar M.",
"",
"Steward Observatory"
]
] |
0706.0528 | Julien Laurat | J. Laurat, K. S. Choi, H. Deng, C. W. Chou, H. J. Kimble | Heralded Entanglement between Atomic Ensembles: Preparation,
Decoherence, and Scaling | 4 pages | Phys. Rev. Lett. 99, 180504 (2007) | 10.1103/PhysRevLett.99.180504 | null | quant-ph | null | Heralded entanglement between collective excitations in two atomic ensembles
is probabilistically generated, stored, and converted to single photon fields.
By way of the concurrence, quantitative characterizations are reported for the
scaling behavior of entanglement with excitation probability and for the
temporal dynamics of various correlations resulting in the decay of
entanglement. A lower bound of the concurrence for the collective atomic state
of 0.9\pm 0.3 is inferred. The decay of entanglement as a function of storage
time is also observed, and related to the local dynamics.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:24:21 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Sep 2007 19:27:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Laurat",
"J.",
""
],
[
"Choi",
"K. S.",
""
],
[
"Deng",
"H.",
""
],
[
"Chou",
"C. W.",
""
],
[
"Kimble",
"H. J.",
""
]
] |
0706.0529 | Yaroslaw Bazaliy | Ya. B. Bazaliy | Generation of microwave radiation in planar spin-transfer devices | null | Phys. Rev. B 76, 140402(R) (2007) | 10.1103/PhysRevB.76.140402 | null | cond-mat.mtrl-sci | null | Current induced precession states in spin-transfer devices are studied in the
case of large easy plane anisotropy (present in most experimental setups). It
is shown that the effective one-dimensional planar description provides a
simple qualitative understanding of the emergence and evolution of such states.
Switching boundaries are found analytically for the collinear device and the
spin-flip transistor. The latter can generate microwave oscillations at zero
external magnetic field without either special functional form of spin-transfer
torque, or ``field-like'' terms, if Gilbert constant corresponds to the
overdamped planar regime.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:35:36 GMT"
}
] | 2007-10-30T00:00:00 | [
[
"Bazaliy",
"Ya. B.",
""
]
] |
0706.0530 | Giuseppe Galletta | G. Galletta, M. D'Alessandro, G. Bertoloni, G. Fanti, E. Dainese, M.
Pelizzo, F. Ferri, D. Pavarin, C. Bettanini, G. Bianchini and S. Debei | LISA: Mars and the limits of life | 4 pages, 3 figures. Mem. SAIt, in press | null | null | null | astro-ph | null | We describe the results of the first tests made on LISA, a simulator of
planetary environments designed and built in Padua, dedicated to the study of
the limit of bacterial life on the planet Mars. Tests on the cryogenic circuit,
on the UV illumination and on bacterial coltures at room temperature that shall
be used as references are described.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 14:34:37 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Galletta",
"G.",
""
],
[
"D'Alessandro",
"M.",
""
],
[
"Bertoloni",
"G.",
""
],
[
"Fanti",
"G.",
""
],
[
"Dainese",
"E.",
""
],
[
"Pelizzo",
"M.",
""
],
[
"Ferri",
"F.",
""
],
[
"Pavarin",
"D.",
""
],
[
"Bettanini",
"C.",
""
],
[
"Bianchini",
"G.",
""
],
[
"Debei",
"S.",
""
]
] |
0706.0531 | John Rognes | Nils A. Baas, Bjorn Ian Dundas, Birgit Richter and John Rognes | Ring completion of rig categories | There was a mathematical error in arXiv:0706.0531v2: the map T in the
purported proof of Lemma 3.7(2) is not well defined. Version 4 has been
edited for notational consistency | Journal f\"ur die reine und angewandte Mathematik 674 (2013) 43-80 | 10.1515/crelle.2012.024 | null | math.KT math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We offer a solution to the long-standing problem of group completing within
the context of rig categories (also known as bimonoidal categories). Given a
rig category R we construct a natural additive group completion R' that retains
the multiplicative structure, hence has become a ring category. If we start
with a commutative rig category R (also known as a symmetric bimonoidal
category), the additive group completion R' will be a commutative ring
category. In an accompanying paper we show how this can be used to prove the
conjecture from [BDR] that the algebraic K-theory of the connective topological
K-theory spectrum ku is equivalent to the algebraic K-theory of the rig
category V of complex vector spaces.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:51:05 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Dec 2007 15:03:14 GMT"
},
{
"version": "v3",
"created": "Wed, 9 Sep 2009 16:33:32 GMT"
},
{
"version": "v4",
"created": "Wed, 25 Aug 2010 13:48:33 GMT"
}
] | 2022-06-22T00:00:00 | [
[
"Baas",
"Nils A.",
""
],
[
"Dundas",
"Bjorn Ian",
""
],
[
"Richter",
"Birgit",
""
],
[
"Rognes",
"John",
""
]
] |
0706.0532 | Washington Chagas-Filho | W. Chagas-Filho | 2T Physics, Scale Invariance and Topological Vector Fields | Accepted for publication in International Journal of Theoretical
Physics | null | 10.1007/s10773-007-9598-5 | null | hep-th | null | We construct, in classical two-time physics, the necessary structure for the
most general configuration space formulation of quantum mechanics containing
gravity in d+2 dimensions. This structure is composed of a symmetric Riemannian
metric tensor and of a vector field that defines a section of a flat U(1)
bundle over space-time. This construction is possible because of the existence
of a finite local scale invariance of the Hamiltonian and because two-time
physics contains, at the classical level, a local generalization of the
discrete duality symmetry between position and momentum that underlies the
structure of quantum mechanics.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:40:20 GMT"
},
{
"version": "v2",
"created": "Thu, 16 Aug 2007 19:35:11 GMT"
},
{
"version": "v3",
"created": "Thu, 22 Nov 2007 10:30:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chagas-Filho",
"W.",
""
]
] |
0706.0533 | Ann-Cecilie Larsen | A.C. Larsen, M. Guttormsen, R. Chankova, T. Loennroth, S. Messelt, F.
Ingebretsen, J. Rekstad, A. Schiller, S. Siem, N.U.H. Syed, and A. Voinov | Nuclear level densities and gamma-ray strength functions in 44,45Sc | 21 pages, 13 figures. Published version | Phys.Rev.C76:044303,2007 | 10.1103/PhysRevC.76.044303 | null | nucl-ex | null | The scandium isotopes 44,45Sc have been studied with the 45Sc(3He,alpha
gamma)44Sc and 45Sc(3He,3He' gamma)45Sc reactions, respectively. The nuclear
level densities and gamma-ray strength functions have been extracted using the
Oslo method. The experimental level densities are compared to calculated level
densities obtained from a microscopic model based on BCS quasiparticles within
the Nilsson level scheme. This model also gives information about the parity
distribution and the number of broken Cooper pairs as a function of excitation
energy. The experimental gamma-ray strength functions are compared to
theoretical models of the E1, M1, and E2 strength, and to data from (gamma,n)
and (gamma,p) experiments. The strength functions show an enhancement at low
gamma energies that cannot be explained by the present, standard models.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:48:34 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Aug 2007 10:44:58 GMT"
},
{
"version": "v3",
"created": "Tue, 22 Jan 2008 20:12:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Larsen",
"A. C.",
""
],
[
"Guttormsen",
"M.",
""
],
[
"Chankova",
"R.",
""
],
[
"Loennroth",
"T.",
""
],
[
"Messelt",
"S.",
""
],
[
"Ingebretsen",
"F.",
""
],
[
"Rekstad",
"J.",
""
],
[
"Schiller",
"A.",
""
],
[
"Siem",
"S.",
""
],
[
"Syed",
"N. U. H.",
""
],
[
"Voinov",
"A.",
""
]
] |
0706.0534 | Shuheng Zhou | Shuheng Zhou, John Lafferty, Larry Wasserman | Compressed Regression | 59 pages, 5 figure, Submitted for review | IEEE Transactions on Information Theory, Volume 55, No.2, pp
846--866, 2009 | null | null | stat.ML cs.IT math.IT | null | Recent research has studied the role of sparsity in high dimensional
regression and signal reconstruction, establishing theoretical limits for
recovering sparse models from sparse data. This line of work shows that
$\ell_1$-regularized least squares regression can accurately estimate a sparse
linear model from $n$ noisy examples in $p$ dimensions, even if $p$ is much
larger than $n$. In this paper we study a variant of this problem where the
original $n$ input variables are compressed by a random linear transformation
to $m \ll n$ examples in $p$ dimensions, and establish conditions under which a
sparse linear model can be successfully recovered from the compressed data. A
primary motivation for this compression procedure is to anonymize the data and
preserve privacy by revealing little information about the original data. We
characterize the number of random projections that are required for
$\ell_1$-regularized compressed regression to identify the nonzero coefficients
in the true model with probability approaching one, a property called
``sparsistence.'' In addition, we show that $\ell_1$-regularized compressed
regression asymptotically predicts as well as an oracle linear model, a
property called ``persistence.'' Finally, we characterize the privacy
properties of the compression procedure in information-theoretic terms,
establishing upper bounds on the mutual information between the compressed and
uncompressed data that decay to zero.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:42:54 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Jan 2008 06:33:58 GMT"
}
] | 2012-01-11T00:00:00 | [
[
"Zhou",
"Shuheng",
""
],
[
"Lafferty",
"John",
""
],
[
"Wasserman",
"Larry",
""
]
] |
0706.0535 | Thayne Currie | Thayne Currie (1), Scott J. Kenyon (1), George Rieke (2), Zoltan Balog
(2), and Benjamin C. Bromley (3) ((1) Harvard-Smithsonian Center for
Astrophysics, (2) Steward Observatory/University of Arizona, (3) Dept. of
Physics, University of Utah) | Terrestrial Zone Debris Disk Candidates in h and chi Persei | 5 pages, 3 figures, Matched to published version, Astrophysical
Journal Letters, in press: 2007, ApJL, 663, 105 | Astrophys. J. Lett. 663 (2007) 105 | 10.1086/520509 | null | astro-ph | null | We analyze 8 sources with strong mid-infrared excesses in the 13 Myr-old
double cluster h and chi Persei. New optical spectra and broadband SEDs (0.36-8
mu_m) are consistent with cluster membership. We show that material with T ~
300-400 K and Ld/Lstar ~ 10^-4-10^-3 produces the excesses in these sources.
Optically-thick blackbody disk models - including those with large inner holes
- do not match the observed SEDs. The SEDs of optically-thin debris disks
produced from terrestrial planet formation calculations match the observations
well. Thus, some h and chi Persei stars may have debris from terrestrial zone
planet formation.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:50:15 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 19:55:52 GMT"
}
] | 2007-06-28T00:00:00 | [
[
"Currie",
"Thayne",
""
],
[
"Kenyon",
"Scott J.",
""
],
[
"Rieke",
"George",
""
],
[
"Balog",
"Zoltan",
""
],
[
"Bromley",
"Benjamin C.",
""
]
] |
0706.0536 | David Rainwater | Johan Alwall, Tilman Plehn and Dave Rainwater | Same-Sign Charginos and Majorana Neutralinos at the LHC | 14 pages, 2 tables, 7 embedded figs., to appear in PRD; typos
corrected, references added and updated | Phys.Rev.D76:055006,2007 | 10.1103/PhysRevD.76.055006 | null | hep-ph | null | We demonstrate the possibility of studying weakly interacting new particles
in weak boson fusion, using the example of supersymmetric same-sign charginos.
This signal could establish the existence of Majorana neutralinos and give
access to their electroweak couplings. It can be observed over (supersymmetric)
QCD backgrounds provided the charginos are light and not too close to the
squark mass. We finally show how same-sign fermion production can be
distinguished from same-sign scalars or vectors arising in other models of new
physics.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 16:09:10 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Sep 2007 16:57:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Alwall",
"Johan",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Rainwater",
"Dave",
""
]
] |
0706.0537 | Scott Edward Pratt | Selemon Bekele, Fabio Braghin, Zbigniew Chajecki, Paul Chung, John G.
Cramer, Tamas Csorgo, Hans Eggers, Sean Gavin, Frederique Grassi, Yogiro
Hama, Adam Kisiel, Che-Ming Ko, Tomoi Koide, Gastao Krein, Roy Lacey, Richard
Lednicky, Michael A. Lisa, Wesley Metzger, Dariusz Miskowiec, Kenji Morita,
Sandra S. Padula, Scott Pratt, Wei-Liang Qian, Vladislav Simak, Yuri
Sinyukov, Michal Sumbera, Bernardo M. Tavares, Giuseppe Verde, Detlef
Zschiesche | Status and Promise of Particle Interferometry in Heavy-Ion Collisions | HBT Community White Paper drafted during WPCF 2006 in Sao Paulo,
Brazil (typos corrected) | null | 10.1590/S0103-97332007000600002 | null | nucl-ex | null | After five years of running at RHIC, and on the eve of the LHC heavy-ion
program, we highlight the status of femtoscopic measurements. We emphasize the
role interferometry plays in addressing fundamental questions about the state
of matter created in such collisions, and present an enumerated list of
measurements, analyses and calculations that are needed to advance the field in
the coming years.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:58:37 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 18:31:20 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Bekele",
"Selemon",
""
],
[
"Braghin",
"Fabio",
""
],
[
"Chajecki",
"Zbigniew",
""
],
[
"Chung",
"Paul",
""
],
[
"Cramer",
"John G.",
""
],
[
"Csorgo",
"Tamas",
""
],
[
"Eggers",
"Hans",
""
],
[
"Gavin",
"Sean",
""
],
[
"Grassi",
"Frederique",
""
],
[
"Hama",
"Yogiro",
""
],
[
"Kisiel",
"Adam",
""
],
[
"Ko",
"Che-Ming",
""
],
[
"Koide",
"Tomoi",
""
],
[
"Krein",
"Gastao",
""
],
[
"Lacey",
"Roy",
""
],
[
"Lednicky",
"Richard",
""
],
[
"Lisa",
"Michael A.",
""
],
[
"Metzger",
"Wesley",
""
],
[
"Miskowiec",
"Dariusz",
""
],
[
"Morita",
"Kenji",
""
],
[
"Padula",
"Sandra S.",
""
],
[
"Pratt",
"Scott",
""
],
[
"Qian",
"Wei-Liang",
""
],
[
"Simak",
"Vladislav",
""
],
[
"Sinyukov",
"Yuri",
""
],
[
"Sumbera",
"Michal",
""
],
[
"Tavares",
"Bernardo M.",
""
],
[
"Verde",
"Giuseppe",
""
],
[
"Zschiesche",
"Detlef",
""
]
] |
0706.0538 | Maury Goodman | Philip Schreiner and Maury Goodman (for the MINOS collaboration) | Interpretation of the atmospheric muon charge ratio in MINOS | Contribution to the 30th International Cosmic Ray Conference, Merida
Mexico 2007 | null | null | null | hep-ex astro-ph | null | MINOS is the first large magnetic detector deep underground and is the first
to measure the muon charge ratio with high statistics in the region near 1
TeV.\cite{bib:adamson} An approximate formula for the muon charge ratio can be
expressed in terms of $\epsilon_\pi$ = 115 GeV, $\epsilon_K$ = 850 GeV and
$\ec$. The implications for K production in the atmosphere will be discussed.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:05:01 GMT"
}
] | 2007-06-07T00:00:00 | [
[
"Schreiner",
"Philip",
"",
"for the MINOS collaboration"
],
[
"Goodman",
"Maury",
"",
"for the MINOS collaboration"
]
] |
0706.0539 | Maury Goodman | Maury Goodman (for the MINOS collaboration) | The Maximum Detectable Momentum for cosmic ray muons in the MINOS far
detector | Contribution to the 30th International Cosmic Ray Conference, Merida
Mexico 2007 | null | null | null | physics.ins-det | null | A magnetic detector such as MINOS which is measuring the sign of muons has to
deal with issues of bending, which depend on the magnetic field configuration,
and multiple scattering, which depends on the amount of material which is
traversed. Above some momentum which depends on these factors, the momentum
cannot be resolved. Issues related to measurement of the muon charge ratio in
MINOS are discussed.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:07:48 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Goodman",
"Maury",
"",
"for the MINOS collaboration"
]
] |
0706.0540 | Peter Fierlinger | P. Fierlinger, R. DeVoe, B. Flatt, G. Gratta, M. Green, S. Kolkowitz,
F. Leport, M. Montero Diez, R. Neilson, K. O'Sullivan, A. Pocar, J. Wodin | A microfabricated sensor for thin dielectric layers | null | null | 10.1063/1.2906402 | null | physics.gen-ph physics.atom-ph | null | We describe a sensor for the measurement of thin dielectric layers capable of
operation in a variety of environments. The sensor is obtained by
microfabricating a capacitor with interleaved aluminum fingers, exposed to the
dielectric to be measured. In particular, the device can measure thin layers of
solid frozen from a liquid or gaseous medium. Sensitivity to single atomic
layers is achievable in many configurations and, by utilizing fast, high
sensitivity capacitance read out in a feedback system onto environmental
parameters, coatings of few layers can be dynamically maintained. We discuss
the design, read out and calibration of several versions of the device
optimized in different ways. We specifically dwell on the case in which
atomically thin solid xenon layers are grown and stabilized, in cryogenic
conditions, from a liquid xenon bath.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:20:00 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Mar 2008 20:50:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fierlinger",
"P.",
""
],
[
"DeVoe",
"R.",
""
],
[
"Flatt",
"B.",
""
],
[
"Gratta",
"G.",
""
],
[
"Green",
"M.",
""
],
[
"Kolkowitz",
"S.",
""
],
[
"Leport",
"F.",
""
],
[
"Diez",
"M. Montero",
""
],
[
"Neilson",
"R.",
""
],
[
"O'Sullivan",
"K.",
""
],
[
"Pocar",
"A.",
""
],
[
"Wodin",
"J.",
""
]
] |
0706.0541 | Ronald van Luijk | Adam Logan, Ronald van Luijk | Nontrivial elements of Sha explained through K3 surfaces | 37 pages | null | null | null | math.AG math.NT | null | In this paper we present a new method to show that a principal homogeneous
space of the Jacobian of a curve of genus two is nontrivial. The idea is to
exhibit a Brauer-Manin obstruction to the existence of rational points on a
quotient of this principal homogeneous space. In an explicit example we apply
the method to show that a specific curve has infinitely many quadratic twists
whose Jacobians have nontrivial Tate-Shafarevich group.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:20:04 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Logan",
"Adam",
""
],
[
"van Luijk",
"Ronald",
""
]
] |
0706.0542 | Russel J. White | R. J. White (1), J. M. Gabor (2), L. A. Hillenbrand (3) ((1)
University of Alabama in Huntsville, (2) Universtiy of Arizona, (3) Caltech) | High-Dispersion Optical Spectra of Nearby Stars Younger Than The Sun | 1 electronic table; published in the Astronomical Journal | Astron.J.133:2524,2007 | 10.1086/514336 | null | astro-ph | null | We present high-dispersion (R~16,000) optical (3900-8700 A) spectra of 390
stars obtained with the Palomar 60 inch telescope. The majority of stars
observed are part of the Spitzer Legacy Science Program "The Formation and
Evolution of Planetary Systems." Through detailed analysis we determine stellar
properties for this sample, including radial and rotational velocities, Li I
6708 and Ha equivalent widths, the chromospheric activity index R'_HK, and
temperature- and gravity-sensitive line ratios. Several spectroscopic binaries
are also identified. From our tabulations, we illustrate basic age- and
rotation-related correlations among measured indices. One novel result is that
Ca II chromospheric emission appears to saturate at vsini values above ~30
km/s, similar to the well established saturation of X-rays that originate in
the spatially separate coronal regions.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:44:48 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"White",
"R. J.",
""
],
[
"Gabor",
"J. M.",
""
],
[
"Hillenbrand",
"L. A.",
""
]
] |
0706.0543 | Nate Bastian | N. Bastian (1), I. Konstantopoulos (1), L.J. Smith (1,2), G. Trancho
(3,4), M. S. Westmoquette (1), J.S. Gallagher III (5) ((1) University College
London, (2) STScI, (3) Gemini Observatory, (4) Universidad de La Laguna, (5)
UW-Madison) | A detailed study of the enigmatic cluster M82F | 12 pages, 7 figures, accepted MNRAS | Mon.Not.Roy.Astron.Soc.379:1333-1342,2007 | 10.1111/j.1365-2966.2007.12061.x | null | astro-ph | null | We present a detailed study of the stellar cluster M82F, using multi-band
high resolution HST imaging and deep ground based optical slit and integral
field spectroscopy. Using the imaging we create colour maps of the cluster and
surrounding region in order to search for substructure. We find a large amount
of substructure, which we interpret as the result of differential extinction
across the projected face of the cluster. With this interpretation, we are able
to construct a spatially resolved extinction map across the cluster which is
used to derive the intrinsic flux distribution. Fitting cluster profiles (King
and EFF) to the intrinsic images we find that the cluster is 15-30% larger than
previous estimates, and that no strong evidence of mass segregation in this
cluster exists. Using the optical spectra, we find that the age of M82F is
60-80 Myr and from its velocity conclude that the cluster is not physically
associated with a large HII region that it is projected upon, both in agreement
with previous studies. The reconstructed integral field maps show that that
majority of the line emission comes from a nearby HII region. The spatial
dependence of the line widths (implying the presence of multiple
components)measured corresponds to the extinction map derived from photometry,
indicating that the gas/dust clouds responsible for the extinction are also
partially ionised. Even with the wealth of observations presented here, we do
not find a conclusive solution to the problem of the high light-to-mass ratio
previously found for this cluster and its possible top-heavy stellar IMF.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:28:54 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bastian",
"N.",
""
],
[
"Konstantopoulos",
"I.",
""
],
[
"Smith",
"L. J.",
""
],
[
"Trancho",
"G.",
""
],
[
"Westmoquette",
"M. S.",
""
],
[
"Gallagher",
"J. S.",
"III"
]
] |
0706.0544 | Jason Metcalfe | Jeremy Marzuola, Jason Metcalfe, and Daniel Tataru | Strichartz estimates and local smoothing estimates for asymptotically
flat Schr\"odinger equations | 48 pages | null | null | null | math.AP | null | In this article we study global-in-time Strichartz estimates for the
Schr\"odinger evolution corresponding to long-range perturbations of the
Euclidean Laplacian. This is a natural continuation of a recent article of the
third author, where it is proved that local smoothing estimates imply
Strichartz estimates. In the aforementioned paper, the third author proved the
local smoothing estimates for small perturbations of the Laplacian. Here we
consider the case of large perturbations in three increasingly favorable
scenarios: (i) without non-trapping assumptions we prove estimates outside a
compact set modulo a lower order spatially localized error term, (ii) with
non-trapping assumptions we prove global estimates modulo a lower order
spatially localized error term, and (iii) for time independent operators with
no resonance or eigenvalue at the bottom of the spectrum we prove global
estimates for the projection onto the continuous spectrum.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:31:12 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Marzuola",
"Jeremy",
""
],
[
"Metcalfe",
"Jason",
""
],
[
"Tataru",
"Daniel",
""
]
] |
0706.0545 | Assaf Naor | James R. Lee, Assaf Naor, Yuval Peres | Trees and Markov convexity | null | null | null | null | math.MG math.FA | null | We show that an infinite weighted tree admits a bi-Lipschitz embedding into
Hilbert space if and only if it does not contain arbitrarily large complete
binary trees with uniformly bounded distortion. We also introduce a new metric
invariant called Markov convexity, and show how it can be used to compute the
Euclidean distortion of any metric tree up to universal factors.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:45:35 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Lee",
"James R.",
""
],
[
"Naor",
"Assaf",
""
],
[
"Peres",
"Yuval",
""
]
] |
0706.0546 | Ribamar Reis | Emille E. O. Ishida, Ribamar R. R. Reis, Alan V. Toribio and Ioav Waga | When did cosmic acceleration start? How fast was the transition? | 7 pages, 3 figures. Replaced to match the published version | Astropart.Phys.28:547-552,2008 | 10.1016/j.astropartphys.2007.10.004 | null | astro-ph | null | Cosmic acceleration is investigated through a kink-like expression for the
deceleration parameter (q). The new parametrization depends on the initial
(q_i) and final (q_f) values of q, on the redshift of the transition from
deceleration to acceleration (z_{t}) and the width of such transition (\tau).
We show that although supernovae (SN) observations (Gold182 and SNLS data
samples) indicate, at high confidence, that a transition occurred in the past
(z_{t}>0) they do not, by themselves, impose strong constraints on the maximum
value of z_{t}. However, when we combine SN with the measurements of the ratio
between the comoving distance to the last scattering surface and the
SDSS+2dfGRS BAO distance scale (S_{k}/D_{v}) we obtain, at 95.4% confidence
level, z_{t}=0.84+{0.17}-{0.13} and \tau =0.51-{0.17}+{0.23} for
(S_{k}/D_{v}+Gold182), and z_{t}=0.88-{0.10}+{0.12} and \tau
=0.35-{0.10}+{0.12} for (S_{k}/D_{v} + SNLS), assuming q_i=0.5 and q_f=-1. We
also analyze the general case, q_f\in(-\infty,0) finding the constraints that
the combined tests (S_{k}/D_{v} + SNLS) impose on the present value of the
deceleration parameter (q_0).
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:43:07 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 14:22:35 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Jun 2007 21:11:15 GMT"
},
{
"version": "v4",
"created": "Fri, 3 Aug 2007 19:33:38 GMT"
},
{
"version": "v5",
"created": "Thu, 27 Dec 2007 12:20:40 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ishida",
"Emille E. O.",
""
],
[
"Reis",
"Ribamar R. R.",
""
],
[
"Toribio",
"Alan V.",
""
],
[
"Waga",
"Ioav",
""
]
] |
0706.0547 | Rodger Thompson Prof. | Rodger I. Thompson, Daniel Eisenstein, Xiaohui Fan, Marcia Rieke and
Robert C. Kennicutt | Evidence for a Z < 8 Origin of the Source Subtracted Near Infrared
Background | Accepted for publication in the Astrophysical Journal | Astrophys.J.666:658-662,2007 | 10.1086/520634 | null | astro-ph | null | This letter extends our previous fluctuation analysis of the near infrared
background at 1.6 microns to the 1.1 micron (F110W) image of the Hubble Ultra
Deep field. When all detectable sources are removed the ratio of fluctuation
power in the two images is consistent with the ratio expected for faint, z<8,
sources, and is inconsistent with the expected ratio for galaxies with z>8. We
also use numerically redshifted model galaxy spectral energy distributions for
50 and 10 million year old galaxies to predict the expected fluctuation power
at 3.6 microns and 4.5 microns to compare with recent Spitzer observations. The
predicted fluctuation power for galaxies at z = 0-12 matches the observed
Spitzer fluctuation power while the predicted power for z>13 galaxies is much
higher than the observed values. As was found in the 1.6 micron (F160W)
analysis the fluctuation power in the source subtracted F110W image is two
orders of magnitude below the power in the image with all sources present. This
leads to the conclusion that the 0.8--1.8 micron near infrared background is
due to resolved galaxies in the redshift range z<8, with the majority of power
in the redshift range of 0.5--1.5.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 21:47:18 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Thompson",
"Rodger I.",
""
],
[
"Eisenstein",
"Daniel",
""
],
[
"Fan",
"Xiaohui",
""
],
[
"Rieke",
"Marcia",
""
],
[
"Kennicutt",
"Robert C.",
""
]
] |
0706.0548 | Vladimir Nikiforov | Vladimir Nikiforov | More spectral bounds on the clique and independence numbers | This paper has been withdrawn by the author due to a crucial mistake | null | null | null | math.CO | null | We give some new bounds for the clique and independence numbers of a graph in
terms of its eigenvalues.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 22:00:02 GMT"
},
{
"version": "v2",
"created": "Sun, 29 Jan 2017 17:03:11 GMT"
}
] | 2017-01-31T00:00:00 | [
[
"Nikiforov",
"Vladimir",
""
]
] |
0706.0549 | David Joyner | David Joyner | A primer on computational group homology and cohomology | 40+ pages. To appear in conference for the 60th birthday of Tont
Gaglione | null | null | null | math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These are expanded lecture notes of a series of expository talks surveying
basic aspects of group cohomology and homology. They were written for someone
who has had a first course in graduate algebra but no background in cohomology.
You should know the definition of a (left) module over a (non-commutative)
ring, what $\zzz[G]$ is (where $G$ is a group written multiplicatively and
$\zzz$ denotes the integers), and some ring theory and group theory. However,
an attempt has been made to (a) keep the presentation as simple as possible,
(b) either provide an explicit reference of proof of everything.
Several computer algebra packages are used to illustrate the computations,
though for various reasons we have focused on the free, open source packages
such as GAP and SAGE.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 22:02:16 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Jun 2009 11:54:39 GMT"
}
] | 2009-06-10T00:00:00 | [
[
"Joyner",
"David",
""
]
] |
0706.0550 | Javier Parcet | Marius Junge, Javier Parcet | Operator space Lp embedding theory I | This is the most accessible part of our paper Operator space
embedding of Lq into Lp, 28 pages. 28 pages | null | null | null | math.OA math.PR | null | Given any $1 < q \le 2$, we use new free probability techniques to construct
a completely isomorphic embedding of $\ell_q$ (equipped with its natural
operator space structure) into the predual of a sufficiently large QWEP von
Neumann algebra.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 22:02:32 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Junge",
"Marius",
""
],
[
"Parcet",
"Javier",
""
]
] |
0706.0551 | Miguel Pi\~nar | Juan J. Moreno-Balcazar, Teresa E. Perez, Miguel A. Pinar | A generating function for non-standard orthogonal polynomials involving
differences: the Meixner case | 14 pages | null | null | null | math.CA | null | In this paper we deal with a family of non--standard polynomials orthogonal
with respect to an inner product involving differences. This type of inner
product is the so--called $\Delta$--Sobolev inner product. Concretely, we
consider the case in which both measures appearing in the inner product
correspond to the Pascal distribution (the orthogonal polynomials associated to
this distribution are known as Meixner polynomials). The aim of this work is to
obtain a generating function for the $\Delta$--Meixner--Sobolev orthogonal
polynomials and, by using a limit process, recover a generating function for
Laguerre--Sobolev orthogonal polynomials.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 22:27:23 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Moreno-Balcazar",
"Juan J.",
""
],
[
"Perez",
"Teresa E.",
""
],
[
"Pinar",
"Miguel A.",
""
]
] |
0706.0552 | Robert Finkel | Robert W. Finkel | Molecular Energy Relations From Chemical Kinetics | 4 pages | null | null | null | physics.chem-ph | null | Since molecular energy transformations are responsible for chemical reaction
rates at the most fundamental level, chemical kinetics should provide some
information about molecular energies. This is the premise and objective of this
note. We describe a Hamiltonian formulation for kinetic rate equations where
the concentrations are the generalized coordinates and the conjugate momenta
are simply related to individual average molecular energies. Simple examples
are presented and the resulting energy relations naturally include
non-equilibrium reactions. An analysis predicts the reasonable outcome that
thermal agitation of a composite molecule increases its rate of dissociation.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 22:42:47 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 23:07:02 GMT"
}
] | 2007-06-07T00:00:00 | [
[
"Finkel",
"Robert W.",
""
]
] |
0706.0553 | Heidi Fearn Prof | Heidi Fearn | Can Light Signals Travel Faster than c in Nontrivial Vacuua in Flat
space-time? Relativistic Causality II | 12 pages no figures | LaserPhys.17:695-699,2007 | 10.1134/S1054660X07050155 | null | quant-ph | null | In this paper we show that the Scharnhorst effect (Vacuum with boundaries or
a Casimir type vacuum) cannot be used to generate signals showing measurable
faster-than-c speeds. Furthermore, we aim to show that the Scharnhorst effect
would violate special relativity, by allowing for a variable speed of light in
vacuum, unless one can specify a small invariant length scale. This invariant
length scale would be agreed upon by all inertial observers. We hypothesize the
approximate scale of the invariant length.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 22:56:02 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fearn",
"Heidi",
""
]
] |
0706.0554 | Maury Goodman | Juergen Reichenbacher | Differences in $dE/dX$ for $\mu+$ and $\mu-$ and its Effect on the
Underground Charge Ratio | Contribution to the 30th International Cosmic Ray Conference, Merida
Mexico, 2007 (v2: appending DOE contract number) | null | null | null | hep-ph | null | Theoretical calculations predict a small fractional difference in energy loss
for $\mu^+$ and $\mu^-$ of the order of $0.15 %$ at high energies. This is
predominantly due to a $z^3$ term in an extended ionization $dE/dX$ relation,
in analogy to the Barkas effect at low energies around the Bethe-Bloch maximum.
The atmospheric muon energy spectrum is steeply falling off with approximately
$E^{-3.7}$ and thus the small difference in $dE/dX$ between $\mu^+$ and $\mu^-$
at high energies results in an amplified charge asymmetry of about $0.6 %$ many
thousand meters water equivalent deep underground.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:00:50 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 03:44:58 GMT"
}
] | 2007-06-22T00:00:00 | [
[
"Reichenbacher",
"Juergen",
""
]
] |
0706.0555 | Rajendra Zope | Rajendra R. Zope, Tunna Baruah, and Mark R. Pederson (UTEP and NRL) | Polarizabilities of Intermediate Sized Lithium Clusters From
Density-Functional Theory | JCMSE style, 4 figures | null | null | null | cond-mat.mtrl-sci physics.atm-clus | null | We present a detailed investigation of static dipole polarizability of
lithium clusters containing up to 22 atoms. We first build a database of
lithium clusters by optimizing several candidate structures for the ground
state geometry for each size. The full polarizability tensor is determined for
about 5-6 isomers of each cluster size using the finite-field method. All
calculations are performed using large Gaussian basis sets, and within the
generalized gradient approximation to the density functional theory, as
implemented in the NRLMOL suite of codes. The average polarizability per atom
varies from 11 to 9 Angstrom^3, within the 8-22 size range and show smoother
decrease with increase in cluster size than the experimental values. While the
average polarizability exhibits a relatively weak dependence on cluster
conformation, significant changes in the degree of anisotropy of the
polarizability tensor are observed. Interestingly, in addition to the expected
even odd (0 and 1 $\mu_B$) magnetic states, our results show several cases
where clusters with an odd number of Li atoms exhibit elevated spin states
(e.g. 3 $\mu_B$).
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:07:30 GMT"
},
{
"version": "v2",
"created": "Mon, 12 Nov 2007 22:32:45 GMT"
}
] | 2007-11-13T00:00:00 | [
[
"Zope",
"Rajendra R.",
"",
"UTEP and NRL"
],
[
"Baruah",
"Tunna",
"",
"UTEP and NRL"
],
[
"Pederson",
"Mark R.",
"",
"UTEP and NRL"
]
] |
0706.0556 | Matthew Hastings | M. B. Hastings | Random Unitaries Give Quantum Expanders | 14 pages, 1 figure | Phys. Rev. A 76, 032315 (2007). | 10.1103/PhysRevA.76.032315 | null | quant-ph cond-mat.str-el | null | We show that randomly choosing the matrices in a completely positive map from
the unitary group gives a quantum expander. We consider Hermitian and
non-Hermitian cases, and we provide asymptotically tight bounds in the
Hermitian case on the typical value of the second largest eigenvalue. The key
idea is the use of Schwinger-Dyson equations from lattice gauge theory to
efficiently compute averages over the unitary group.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 17:13:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hastings",
"M. B.",
""
]
] |
0706.0557 | Matja\v{z} \v{Z}eljko | Du\v{s}an Repov\v{s}, Witold Rosicki, Andreas Zastrow, Matja\v{z}
\v{Z}eljko | Embeddability of multiple cones | Some minor corrections were made | Topol. Appl. 155:11 (2008), 1201-1206. | 10.1016/j.topol.2008.02.007 | null | math.GT | null | The main result of this paper is that if $X$ is a Peano continuum such that
its $n$-th cone $C^n(X)$ embeds into $\RR^{n+2}$ then $X$ embeds into $S^2$.
This solves a problem proposed by W. Rosicki.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:36:17 GMT"
},
{
"version": "v2",
"created": "Sat, 29 Mar 2008 09:11:12 GMT"
}
] | 2008-05-14T00:00:00 | [
[
"Repovš",
"Dušan",
""
],
[
"Rosicki",
"Witold",
""
],
[
"Zastrow",
"Andreas",
""
],
[
"Željko",
"Matjaž",
""
]
] |
0706.0558 | Sumner Starrfield | S. Starrfield, C. Iliadis, W. R. Hix, F. X. Timmes, W. M. Sparks | The Effects of Changes in Reaction Rates on Simulations of Nova
Explosions | 9 pages, 2 figures, as it appeared in the Proceedings of the Tours
2006 Symposium on Nuclear Physics | AIP Conf.Proc.891:364-372,2007 | 10.1063/1.2713538 | null | astro-ph | null | Classical novae participate in the cycle of Galactic chemical evolution in
which grains and metal enriched gas in their ejecta, supplementing those of
supernovae, AGB stars, and Wolf-Rayet stars, are a source of heavy elements for
the ISM. Once in the diffuse gas, this material is mixed with the existing
gases and then incorporated into young stars and planetary systems during star
formation. Infrared observations have confirmed the presence of carbon, SiC,
hydrocarbons, and oxygen-rich silicate grains in nova ejecta, suggesting that
some fraction of the pre-solar grains identified in meteoritic material come
from novae. The mean mass returned by a nova outburst to the ISM probably
exceeds ~2 x 10^{-4} Solar Masses. Using the observed nova rate of 35 per year
in our Galaxy, it follows that novae introduce more than ~7 x 10^{-3} Solar
Masses per year of processed matter into the ISM. Novae are expected to be the
major source of 15N and 17O in the Galaxy and to contribute to the abundances
of other isotopes in this atomic mass range. Here, we report on how changes in
the nuclear reaction rates affect the properties of the outburst and alter the
predictions of the contributions of novae to Galactic chemical evolution. We
also discuss the necessity of including the pep reaction in studies of
thermonuclear runaways in material accreted onto white dwarfs.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:38:20 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Starrfield",
"S.",
""
],
[
"Iliadis",
"C.",
""
],
[
"Hix",
"W. R.",
""
],
[
"Timmes",
"F. X.",
""
],
[
"Sparks",
"W. M.",
""
]
] |
0706.0559 | Gavin E. Crooks | Gavin E. Crooks | Measuring thermodynamic length | 4 pages; Typos corrected | Phys. Rev. Lett. 99 100602 (2007) | 10.1103/PhysRevLett.99.100602 | LBNL-62740 | cond-mat.stat-mech | null | Thermodynamic length is a metric distance between equilibrium thermodynamic
states. Among other interesting properties, this metric asymptotically bounds
the dissipation induced by a finite time transformation of a thermodynamic
system. It is also connected to the Jensen-Shannon divergence, Fisher
information and Rao's entropy differential metric. Therefore, thermodynamic
length is of central interest in understanding matter out-of-equilibrium. In
this paper, we will consider how to define thermodynamic length for a small
system described by equilibrium statistical mechanics and how to measure
thermodynamic length within a computer simulation. Surprisingly, Bennett's
classic acceptance ratio method for measuring free energy differences also
measures thermodynamic length.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:34:57 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Sep 2007 22:30:20 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Crooks",
"Gavin E.",
""
]
] |
0706.0560 | Fabricio Cabral | Fabricio Bandeira Cabral | Queues with heterogeneous servers and uninformed customers: who works
the most? | null | null | null | null | math.PR | null | In this paper, we consider systems that can be modelled by $M \mid M \mid n$
queues with heterogeneous servers and non informed customers. Considering any
two servers: we show that the probability that the fastest server is busy is
smaller than the probability that the slowest server is busy. Moreover, we show
that the effective rate of service done by the fastest server is larger than
effective rate of service done by the slowest server.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:41:19 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Cabral",
"Fabricio Bandeira",
""
]
] |
0706.0561 | Yuji Urata | Yuji Urata, Kui-Yun Huang, Ping-Hung Kuo, Wing-Huen Ip, Yulei Qiu,
Keisuke Masuno, Makoto Tashiro, Keichi Abe, Kaori Onda, Natsuki Kodaka,
Makoto Kuwahara, Toru Tamagawa, Fumihiko Usui, Kunihito Ioka, Yi-Hsi Lee,
Jianyan Wei, Jinsong Deng, Weikang Zheng, and Kazuo Makishima | A multi band study of the optically dark GRB 051028 | 5page, 5 figures, 1 table, accepted for publication in PASJ Letter.
PASJ style | null | 10.1093/pasj/59.4.L29 | null | astro-ph | null | Observations were made of the optical afterglow of GRB 051028 with the Lulin
observatory's 1.0 m telescope and the WIDGET robotic telescope system. R band
photometric data points were obtained on 2005 October 28 (UT), or 0.095-0.180
days after the burst. There is a possible plateau in the optical light curve
around 0.1 days after the burst; the light curve resembles optically bright
afterglows (e.g. GRB 041006, GRB 050319, GRB060605) in shape of the light curve
but not in brightness. The brightness of the GRB 051028 afterglow is 3
magnitudes fainter than that of one of the dark events, GRB 020124. Optically
dark GRBs have been attributed to dust extinction within the host galaxy or
high redshift. However, the spectrum analysis of the X-rays implies that there
is no significant absorption by the host galaxy. Furthermore, according to the
model theoretical calculation of the Ly$\alpha$ absorption to find the limit of
GRB 051028's redshift, the expected $R$ band absorption is not high enough to
explain the darkness of the afterglow. While the present results disfavor
either the high-redshift hypothesis or the high extinction scenario for
optically dark bursts, they are consistent with the possibility that the
brightness of the optical afterglow, intrinsically dark.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:49:12 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Urata",
"Yuji",
""
],
[
"Huang",
"Kui-Yun",
""
],
[
"Kuo",
"Ping-Hung",
""
],
[
"Ip",
"Wing-Huen",
""
],
[
"Qiu",
"Yulei",
""
],
[
"Masuno",
"Keisuke",
""
],
[
"Tashiro",
"Makoto",
""
],
[
"Abe",
"Keichi",
""
],
[
"Onda",
"Kaori",
""
],
[
"Kodaka",
"Natsuki",
""
],
[
"Kuwahara",
"Makoto",
""
],
[
"Tamagawa",
"Toru",
""
],
[
"Usui",
"Fumihiko",
""
],
[
"Ioka",
"Kunihito",
""
],
[
"Lee",
"Yi-Hsi",
""
],
[
"Wei",
"Jianyan",
""
],
[
"Deng",
"Jinsong",
""
],
[
"Zheng",
"Weikang",
""
],
[
"Makishima",
"Kazuo",
""
]
] |
0706.0562 | Ernesto S. Loscar | Ernesto S. Loscar, R. A. Borzi, Ezequiel V. Albano | Interplay between thermal percolation and jamming upon dimer adsorption
on binary alloys | 20 pages, 10 figures | Phys. Rev. E 74, 051601 (2006) | 10.1103/PhysRevE.74.051601 | null | cond-mat.stat-mech | null | Using Monte Carlo simulations we study jamming and percolation processes upon
the random sequential adsorption of dimers on binary alloys with different
degrees of structural order. We obtain the equimolar mixtures used as
substrates by applying the isomorphism between an alloy and the Ising model
(conserved order parameter). The annealing temperature $T$ of the mixture then
is a continuous parameter that characterizes the different sets of substrates,
shaping the deposition process. As the alloy undergoes an order-disorder phase
transition at the Onsager critical temperature ($T_{c}$), the jamming and
percolating properties of the dimers deposited over the substrate are subjected
to non-trivial changes. These are reflected in a density-temperature phase
diagram with three well-defined regions. We find that for $T < T^* = 1.22
T_{c}$ the occurrence of jamming prevents the onset of percolating clusters,
while percolation is possible for $T > T^{*}$. Particular attention is focused
close to $T^{*}$, where the interplay between jamming and percolation restricts
fluctuations, forcing exponents seemingly different from the standard
percolation universality class. By analogy with a thermal transition, we study
the onset of percolation by using the {\it temperature} (in this case, the
substrate annealing temperature) as a control parameter. By proposing thermal
scaling Ansatzes we analyze the behavior of the percolation threshold and its
thermally induced fluctuations. Also, the fractal dimension of the percolating
cluster is determined. Based on these measurements and the excellent data
collapsing, we conclude that the universality class of standard percolation is
preserved for all temperatures.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:52:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Loscar",
"Ernesto S.",
""
],
[
"Borzi",
"R. A.",
""
],
[
"Albano",
"Ezequiel V.",
""
]
] |
0706.0563 | Lucas Cieza | Lucas Cieza, Deborah L. Padgett, Karl R. Stapelfeldt, Jean-Charles
Augereau, Paul Harvey, Neal J. Evans, II, Bruno Merin, David Koerner, Anneila
Sargent, Ewine F. van Dishoeck, Lori Allen, Geoffrey Blake, Timothy Brooke,
Nicholas Chapman, Tracy Huard, Shih-Ping Lai, Lee Mundy, Philip C. Myers,
William Spiesman, Zahed Wahhaj | The Spitzer c2d Survey of Weak-line T Tauri Stars II: New Constraints on
the Timescale for Planet Building | 54 pages, 13 figures, Accepted by ApJ | Astrophys.J.667:308-328,2007 | 10.1086/520698 | null | astro-ph | null | One of the central goals of the Spitzer Legacy Project ``From Molecular Cores
to Planet-forming Disks'' (c2d) is to determine the frequency of remnant
circumstellar disks around weak-line T Tauri stars (wTTs) and to study the
properties and evolutionary status of these disks. Here we present a census of
disks for a sample of over 230 spectroscopically identified wTTs located in the
c2d IRAC (3.6, 4.5, 4.8, and 8.0 um) and MIPS (24 um) maps of the Ophiuchus,
Lupus, and Perseus Molecular Clouds. We find that ~20% of the wTTs in a
magnitude limited subsample have noticeable IR-excesses at IRAC wavelengths
indicating the presence of a circumstellar disk. The disk frequencies we find
in these 3 regions are ~3-6 times larger than that recently found for a sample
of 83 relatively isolated wTTs located, for the most part, outside the highest
extinction regions covered by the c2d IRAC and MIPS maps. The disk fractions we
find are more consistent with those obtained in recent Spitzer studies of wTTs
in young clusters such as IC 348 and Tr 37. From their location in the H-R
diagram, we find that, in our sample, the wTTs with excesses are among the
younger part of the age distribution. Still, up to ~50% of the apparently
youngest stars in the sample show no evidence of IR excess, suggesting that the
circumstellar disks of a sizable fraction of pre-main-sequence stars dissipate
in a timescale of ~1 Myr. We also find that none of the stars in our sample
apparently older than ~10 Myrs have detectable circumstellar disks at
wavelengths < 24 um. Also, we find that the wTTs disks in our sample exhibit a
wide range of properties (SED morphology, inner radius, L_DISK/L*, etc) which
bridge the gaps observed between the cTTs and the debris disk regimes.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 23:55:50 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Cieza",
"Lucas",
""
],
[
"Padgett",
"Deborah L.",
""
],
[
"Stapelfeldt",
"Karl R.",
""
],
[
"Augereau",
"Jean-Charles",
""
],
[
"Harvey",
"Paul",
""
],
[
"Evans",
"Neal J.",
""
],
[
"II",
"",
""
],
[
"Merin",
"Bruno",
""
],
[
"Koerner",
"David",
""
],
[
"Sargent",
"Anneila",
""
],
[
"van Dishoeck",
"Ewine F.",
""
],
[
"Allen",
"Lori",
""
],
[
"Blake",
"Geoffrey",
""
],
[
"Brooke",
"Timothy",
""
],
[
"Chapman",
"Nicholas",
""
],
[
"Huard",
"Tracy",
""
],
[
"Lai",
"Shih-Ping",
""
],
[
"Mundy",
"Lee",
""
],
[
"Myers",
"Philip C.",
""
],
[
"Spiesman",
"William",
""
],
[
"Wahhaj",
"Zahed",
""
]
] |
0706.0564 | Josephine Yu | Bernd Sturmfels and Josephine Yu | Tropical Implicitization and Mixed Fiber Polytopes | 21 pages, 2 figures; Typo fixed in Theorem 5.2 | Software for algebraic geometry, 111--131, IMA Vol. Math. Appl.,
148, Springer, New York, 2008 | null | null | cs.SC math.AG math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The software TrIm offers implementations of tropical implicitization and
tropical elimination, as developed by Tevelev and the authors. Given a
polynomial map with generic coefficients, TrIm computes the tropical variety of
the image. When the image is a hypersurface, the output is the Newton polytope
of the defining polynomial. TrIm can thus be used to compute mixed fiber
polytopes, including secondary polytopes.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 00:53:37 GMT"
},
{
"version": "v2",
"created": "Sun, 20 Jun 2010 22:57:11 GMT"
}
] | 2010-06-22T00:00:00 | [
[
"Sturmfels",
"Bernd",
""
],
[
"Yu",
"Josephine",
""
]
] |
0706.0565 | Jianguo Cao | Jianguo Cao, Bo Dai and Jiaqiang Mei | An extension of Perelman's soul theorem for singular spaces | Update graphs, using the new trapezoid comparison theorem and new
angular excess estimates to prove the main theorem | null | null | null | math.DG math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study open complete metric spaces with non-negative
curvature. Among other things, we establish an extension of Perelman's soul
theorem for possibly singular spaces: "Let X be a complete, non-compact, finite
dimensional Alexandrov space with non-negative curvature. Suppose that X has no
boundary and has positive curvature on a non-empty open subset. Then X must be
a contractible space". The proof of this result uses the detailed analysis of
concavity of distance functions and Busemann functions on singular spaces with
non-negative curvature. We will introduce a family of angular excess functions
to measure convexity and extrinsic curvature of convex hypersurfaces in
singular spaces. We also derive a new comparison for trapezoids in
non-negatively curved spaces, which led to desired convexity estimates for the
proof of our new soul theorem.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 01:37:04 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 13:30:03 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Dec 2007 15:51:34 GMT"
},
{
"version": "v4",
"created": "Wed, 13 Jan 2010 15:38:17 GMT"
},
{
"version": "v5",
"created": "Mon, 29 Mar 2010 19:47:51 GMT"
},
{
"version": "v6",
"created": "Wed, 9 Jun 2010 09:37:11 GMT"
}
] | 2010-06-10T00:00:00 | [
[
"Cao",
"Jianguo",
""
],
[
"Dai",
"Bo",
""
],
[
"Mei",
"Jiaqiang",
""
]
] |
0706.0566 | Bjorn Poonen | Alexandru Buium, Bjorn Poonen | Relations among modular points on elliptic curves | 48 pages | Duke Math. J. 147 (2009), no. 1, 181-191; Compos. Math. 145
(2009), no. 3, 566-602 | 10.1215/00127094-2009-010 | null | math.NT | null | Given a correspondence between a modular curve and an elliptic curve A we
study the group of relations among the CM points of A. In particular we prove
that the intersection of any finite rank subgroup of A with the set of CM
points of A is finite. We also prove a local version of this global result with
an effective bound valid also for certain infinite rank subgroups. We deduce
the local result from a ``reciprocity'' theorem for CL (canonical lift) points
on A. Furthermore we prove similar global and local results for intersections
between subgroups of A and isogeny classes in A. Finally we prove Shimura curve
analogues and, in some cases, higher-dimensional versions of these results.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 01:45:21 GMT"
}
] | 2017-04-03T00:00:00 | [
[
"Buium",
"Alexandru",
""
],
[
"Poonen",
"Bjorn",
""
]
] |
0706.0567 | Keiji Takano | Shin-ichi Kato and Keiji Takano | Subrepresentation Theorem for p-adic Symmetric Spaces | 34 pages; added references | null | null | null | math.RT math.NT | null | The notion of relative cuspidality for distinguished representations attached
to $p$-adic symmetric spaces is introduced. A characterization of relative
cuspidality in terms of Jacquet modules is given and a generalization of
Jacquet's subrepresentation theorem to the relative case (symmetric space case)
is established.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 01:53:58 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 11:12:10 GMT"
}
] | 2007-06-18T00:00:00 | [
[
"Kato",
"Shin-ichi",
""
],
[
"Takano",
"Keiji",
""
]
] |
0706.0568 | Xue-Bing Wu | Bing-Xiao Xu and Xue-Bing Wu (PKU) | A feedback compression star formation model and the black hole - bulge
relations | 13 pages, accepted for publication in ApJ | Astrophys.J.667:92-96,2007 | 10.1086/520107 | null | astro-ph | null | We present a "feedback compression" model to describe the galactic spheroid
formation and its relation with the central nuclear activity. We suggest that
the star formation itself can serve as the "positive feedback" in some
extremely dense region to trigger the starburst. The star formation rate as
well as the related stellar feedback-induced turbulence will be maximized under
the regulation of the background dark halo's gravity. There is also stellar
feedback acting inward to confine and obscure the central black hole (BH) till
the BH grows sufficiently large to satisfy a balance condition between the
accretion disk wind and the inward stellar feedback. The extremely vigorous
star formation activity, the BH - bulge relations, the maximum velocity
dispersion as well as the maximum BH mass are investigated based on such
scenario, and are found to be consistent with observations.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 01:58:05 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Xu",
"Bing-Xiao",
"",
"PKU"
],
[
"Wu",
"Xue-Bing",
"",
"PKU"
]
] |
0706.0569 | Jean Turner | Sara C. Beck (Tel Aviv), Jean L. Turner (UCLA), Jenna Kloosterman
(Berkeley) | The Extraordinary Infrared Spectrum of NGC 1222 (Mkn 603) | accepted, Astronomical Journal. 29 pp, 4 figures. In replacement
version an acknowledgment to NRAO is added | Astron.J.134:1237-1244,2007 | 10.1086/520642 | null | astro-ph | null | The infrared spectra of starburst galaxies are dominated by the
low-excitation lines of [NeII] and [SIII], and the stellar populations deduced
from these spectra appear to lack stars larger than about 35 Msun. The only
exceptions to this result until now were low metallicity dwarf galaxies. We
report our analysis of the mid-infrared spectra obtained with IRS on Spitzer of
the starburst galaxy NGC 1222 (Mkn 603). NGC 1222 is a large spheroidal galaxy
with a starburst nucleus that is a compact radio and infrared source, and its
infrared emission is dominated by the [NeIII] line. This is the first starburst
of solar or near-solar metallicity, known to us, which is dominated by the
high-excitation lines and which is a likely host of high mass stars. We model
the emission with several different assumptions as to the spatial distibution
of the high- and low-excitation lines and find that the upper mass cutoff in
this galaxy is 40-100 Msun.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 02:12:10 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 21:19:59 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Beck",
"Sara C.",
"",
"Tel Aviv"
],
[
"Turner",
"Jean L.",
"",
"UCLA"
],
[
"Kloosterman",
"Jenna",
"",
"Berkeley"
]
] |
0706.0570 | Jean-Luc Marichal | Jean-Luc Marichal | Weighted lattice polynomials | Revised version (minor changes) | Discrete Mathematics 309 (4) (2009) 814-820 | null | null | math.RA math.CO | null | We define the concept of weighted lattice polynomial functions as lattice
polynomial functions constructed from both variables and parameters. We provide
equivalent forms of these functions in an arbitrary bounded distributive
lattice. We also show that these functions include the class of discrete Sugeno
integrals and that they are characterized by a median based decomposition
formula.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 02:17:50 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Jan 2008 12:34:18 GMT"
}
] | 2009-02-23T00:00:00 | [
[
"Marichal",
"Jean-Luc",
""
]
] |
0706.0571 | David Adams | D.A. Adams, R.K.P Zia, B. Schmittmann | Power Spectra of the Total Occupancy in the Totally Asymmetric Simple
Exclusion Process | 4 pages, 4 figures | Phys. Rev. Lett. 99, 020601 (2007) | 10.1103/PhysRevLett.99.020601 | null | cond-mat.stat-mech | null | As a solvable and broadly applicable model system, the totally asymmetric
exclusion process enjoys iconic status in the theory of non-equilibrium phase
transitions. Here, we focus on the time dependence of the total number of
particles on a 1-dimensional open lattice, and its power spectrum. Using both
Monte Carlo simulations and analytic methods, we explore its behavior in
different characteristic regimes. In the maximal current phase and on the
coexistence line (between high/low density phases), the power spectrum displays
algebraic decay, with exponents -1.62 and -2.00, respectively. Deep within the
high/low density phases, we find pronounced \emph{oscillations}, which damp
into power laws. This behavior can be understood in terms of driven biased
diffusion with conserved noise in the bulk.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 02:42:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Adams",
"D. A.",
""
],
[
"Zia",
"R. K. P",
""
],
[
"Schmittmann",
"B.",
""
]
] |
0706.0572 | Yi-Fu Cai | Yi-Fu Cai, Yi Wang | Is Noncommutative Eternal Inflation Possible? | 14 pages, 2 figures, accepted by JCAP | JCAP 0706:022,2007 | 10.1088/1475-7516/2007/06/022 | null | hep-th astro-ph gr-qc | null | We investigate the condition for eternal inflation to take place in the
noncommutative spacetime. We find that the possibility for eternal inflation's
happening is greatly suppressed in this case. If eternal inflation cannot
happen in the low energy region where the noncommutativity is very weak (the UV
region), it will never happen during the whole inflationary history. Based on
these conclusions, we argue that an initial condition for eternal inflation is
available from the property of spacetime noncommutativity.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 02:42:54 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 10:45:11 GMT"
}
] | 2010-10-27T00:00:00 | [
[
"Cai",
"Yi-Fu",
""
],
[
"Wang",
"Yi",
""
]
] |
0706.0573 | Zihua Weng | Zihua Weng | Compounding Fields and Their Quantum Equations in the Curved Spaces | 17 pages | null | null | null | physics.gen-ph | null | Based on the concept of curved spacetime in Einsteinian General Relativity,
the field theories and their quantum theories in the curved octonion spaces etc
are discussed. The research results discover the close relationships of the
curved spacetimes with the field theories and quantum theories. In the field
theories of curved spacetimes, the curvatures have direct effect on field
strength and field source etc. While the curvatures have direct impact on wave
functions and quantum equations etc in the quantum theories of curved
spacetimes. The research results discover that some abnormal phenomena of field
source particles could be explained by the field theories or quantum theories
in the curved spacetimes.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 02:54:00 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Sep 2007 11:23:46 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Weng",
"Zihua",
""
]
] |
0706.0574 | Han Ju Lee | Sung Guen Kim, Han Ju Lee | Norm and Numerical Peak Holomorphic Functions on Banach Spaces | null | null | null | null | math.FA | null | We introduce the notion of numerical (strong) peak function and investigate
the denseness of the norm and numerical peak functions on complex Banach
spaces. Let $A_b(B_X:X)$ be the Banach space of all bounded continuous
functions $f$ on the unit ball $B_X$ of a Banach space $X$ and their
restrictions $f|_{B_X^\circ}$ to the open unit ball are holomorphic. In finite
dimensional spaces, we show that the intersection of the set of all norm peak
functions and the set of all numerical peak functions is a dense $G_\delta$
subset of $A_b(B_X:X)$. We also prove that if $X$ is a smooth Banach space with
the Radon-Nikod\'ym property, then the set of all numerical strong peak
functions is dense in $A_b(B_X:X)$. In particular, when $X=L_p(\mu)$
$(1<p<\infty)$ or $X=\ell_1$, it is shown that the intersection of the set of
all norm strong peak functions and the set of all numerical strong peak
functions is a dense $G_\delta$ subset of $A_b(B_X:X)$.
In the meanwhile, we study the properties of the numerical radius of an
holomorphic function and the numerical index of subspaces of $A_b(B_X:X)$. As
an application, the existence and properties of numerical boundary of
$A_b(B_X:X)$ are studied. Finally, the numerical peak function in $A_b(B_X:X)$
is characterized when $X=\ell_\infty^n$ and some negative results on the
denseness of numerical (strong) peak holomorphic functions are given.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 04:07:18 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Kim",
"Sung Guen",
""
],
[
"Lee",
"Han Ju",
""
]
] |
0706.0575 | Marcelo J. Reboucas | A. Bernui, B. Mota, M.J. Reboucas, R. Tavakol | A note on the large-angle anisotropies in the WMAP cut-sky maps | 10 pages, 3 figeres. We performed a similar analysis of
arXiv:astro-ph/0511666 by considering the LILC map with a Kp2 sky cut, and
find that the presence of a significant axis of asymmetry is robust with
respect to this masking procedure | Int.J.Mod.Phys.D16:411-420,2007 | 10.1142/S0218271807010195 | null | astro-ph gr-qc hep-th | null | Recent analyses of the WMAP data seem to indicate the possible presence of
large-angle anisotropy in the Universe. If confirmed, these can have important
consequences for our understanding of the Universe. A number of attempts have
recently been made to establish the reality and nature of such anisotropies in
the CMB data. Among these is a directional indicator recently proposed by the
authors. A distinctive feature of this indicator is that it can be used to
generate a sky map of the large-scale anisotropies of the CMB maps. Applying
this indicator to full-sky temperature maps we found a statistically
significant preferred direction. The full-sky maps used in these analyses are
known to have residual foreground contamination as well as complicated noise
properties. Thus, here we performed the same analysis for a map where regions
with high foreground contamination were removed. We find that the main feature
of the full-sky analysis, namely the presence of a significant axis of
asymmetry, is robust with respect to this masking procedure. Other subtler
anomalies of the full-sky are on the other hand no longer present.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 03:52:25 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bernui",
"A.",
""
],
[
"Mota",
"B.",
""
],
[
"Reboucas",
"M. J.",
""
],
[
"Tavakol",
"R.",
""
]
] |
0706.0576 | Lester Fox Machado | L. Fox Machado, E. Michel, F. Perez Hernandez, J.H. Pena, Z.P. Li, M.
Chevreton, J.A. Belmonte, M. Alvarez, L. Parrao, M.-A. Dupret, S. Pau, A.
Fernandez, J.P. Michel, R. Michel, A. Pani | Multi-site observations of Delta Scuti stars 7 Aql and 8 Aql (a new
Delta Scuti variable): The twelfth STEPHI campaign in 2003 | 8 pages, 7 fugures, 5 tables, accepted for publication in
Astronomical Journal | Astron.J.134:860-866,2007 | 10.1086/520062 | null | astro-ph | null | We present an analysis of the pulsation behaviour of the Delta Scuti stars 7
Aql (HD 174532) and 8 Aql (HD 174589) -- a new variable star -- observed in the
framework of STEPHI XII campaign during 2003 June--July. 183 hours of high
precision photometry were acquired by using four-channel photometers at three
sites on three continents during 21 days. The light curves and amplitude
spectra were obtained following a classical scheme of multi-channel photometry.
Observations in different filters were also obtained and analyzed. Six and
three frequencies have been unambiguously detected above a 99% confidence level
in the range 0.090 mHz--0.300 mHz and 0.100 mHz-- 0.145 mHz in 7 Aql and 8 Aql
respectively. A comparison of observed and theoretical frequencies shows that 7
Aql and 8 Aql may oscillate with p modes of low radial orders, typical among
Delta Scuti stars. In terms of radial oscillations the range of 8 Aql goes from
n=1 to n=3 while for 7 Aql the range spans from n=4 to n=7. Non-radial
oscillations have to be present in both stars as well. The expected range of
excited modes according to a non adiabatic analysis goes from n=1 to n=6 in
both stars.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 04:01:42 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Machado",
"L. Fox",
""
],
[
"Michel",
"E.",
""
],
[
"Hernandez",
"F. Perez",
""
],
[
"Pena",
"J. H.",
""
],
[
"Li",
"Z. P.",
""
],
[
"Chevreton",
"M.",
""
],
[
"Belmonte",
"J. A.",
""
],
[
"Alvarez",
"M.",
""
],
[
"Parrao",
"L.",
""
],
[
"Dupret",
"M. -A.",
""
],
[
"Pau",
"S.",
""
],
[
"Fernandez",
"A.",
""
],
[
"Michel",
"J. P.",
""
],
[
"Michel",
"R.",
""
],
[
"Pani",
"A.",
""
]
] |
0706.0577 | Minoru Nohara | T. Shibayama, M. Nohara, H. Aruga Katori, Y. Okamoto, Z. Hiroi, and H.
Takagi | Superconductivity in Rh$_2$Ga$_9$ and Ir$_2$Ga$_9$ without Inversion
Symmetry | to appear in J. Phys. Soc. Jpn. Vol. 76, No. 7 (2007) | null | 10.1143/JPSJ.76.073708 | null | cond-mat.supr-con | null | Superconductivity with $T_{\rm c}$ $\simeq$ 2 K was discovered in the
intermetallic binary compounds Rh$_2$Ga$_9$ and Ir$_2$Ga$_9$. This is the first
observation of superconductivity in the Rh-Ga and Ir-Ga binary systems. Both
compounds crystallize in a distorted Co$_2$Al$_9$-type structure (monoclinic,
space group: $Pc$), which lacks spatial inversion symmetry. Specific heat
measurements revealed that both compounds are weak-coupling BCS superconductors
having an isotropic superconducting gap. Measurements in magnetic fields
indicated type-I superconductivity with a critical field $H_{\rm c}(0)$
$\simeq$ 130 Oe for Rh$_2$Ga$_9$ and type-II superconductivity with an upper
critical field $H_{\rm c2}(0)$ $\simeq$ 250 Oe for Ir$_2$Ga$_9$.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 04:14:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shibayama",
"T.",
""
],
[
"Nohara",
"M.",
""
],
[
"Katori",
"H. Aruga",
""
],
[
"Okamoto",
"Y.",
""
],
[
"Hiroi",
"Z.",
""
],
[
"Takagi",
"H.",
""
]
] |
0706.0578 | Susan Margulies | J.A. De Loera, J. Lee, S. Margulies, S. Onn | Expressing Combinatorial Optimization Problems by Systems of Polynomial
Equations and the Nullstellensatz | null | null | null | null | math.CO math.AG | null | Systems of polynomial equations over the complex or real numbers can be used
to model combinatorial problems. In this way, a combinatorial problem is
feasible (e.g. a graph is 3-colorable, hamiltonian, etc.) if and only if a
related system of polynomial equations has a solution. In the first part of
this paper, we construct new polynomial encodings for the problems of finding
in a graph its longest cycle, the largest planar subgraph, the edge-chromatic
number, or the largest k-colorable subgraph.
For an infeasible polynomial system, the (complex) Hilbert Nullstellensatz
gives a certificate that the associated combinatorial problem is infeasible.
Thus, unless P = NP, there must exist an infinite sequence of infeasible
instances of each hard combinatorial problem for which the minimum degree of a
Hilbert Nullstellensatz certificate of the associated polynomial system grows.
We show that the minimum-degree of a Nullstellensatz certificate for the
non-existence of a stable set of size greater than the stability number of the
graph is the stability number of the graph. Moreover, such a certificate
contains at least one term per stable set of G. In contrast, for non-3-
colorability, we found only graphs with Nullstellensatz certificates of degree
four.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 04:28:18 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"De Loera",
"J. A.",
""
],
[
"Lee",
"J.",
""
],
[
"Margulies",
"S.",
""
],
[
"Onn",
"S.",
""
]
] |
0706.0579 | Feng-Wen An | Feng-Wen An | Affine Structures on a Ringed Space and Schemes | Final version. 22 pages. to appear in Chinese Ann of Math, Series B | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we will first introduce the notion of affine structures on a
ringed space and then obtain several properties. Affine structures on a ringed
space, arising mainly from complex analytical spaces of algebraic schemes over
number fields, behave like differential structures on a smooth manifold.
As one does for differential manifolds, we will use pseudogroups of affine
transformations to define affine atlases on a ringed space. An atlas on a space
is said to be an affine structure if it is maximal. An affine structure is
admissible if there is a sheaf on the underlying space such that they are
coincide on all affine charts, which are in deed affine open sets of a scheme.
In a rigour manner, a scheme is defined to be a ringed space with a specified
affine structure if the affine structures are in action in some special cases
such as analytical spaces of algebraic schemes. Particularly, by the whole of
affine structures on a space, we will obtain respectively necessary and
sufficient conditions that two spaces are homeomorphic and that two schemes are
isomorphic, which are the two main theorems of the paper. It follows that the
whole of affine structures on a space and a scheme, as local data, encode and
reflect the global properties of the space and the scheme, respectively.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 05:29:40 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Apr 2008 17:14:20 GMT"
},
{
"version": "v3",
"created": "Tue, 13 Jul 2010 09:46:59 GMT"
},
{
"version": "v4",
"created": "Wed, 14 Jul 2010 00:20:31 GMT"
}
] | 2010-07-15T00:00:00 | [
[
"An",
"Feng-Wen",
""
]
] |
0706.0580 | Yoo Chung | Yoo Chung | Efficient Batch Update of Unique Identifiers in a Distributed Hash Table
for Resources in a Mobile Host | To be presented at the 2010 International Workshop on Cloud
Computing, Applications and Technologies | null | 10.1109/ISPA.2010.73 | null | cs.NI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Resources in a distributed system can be identified using identifiers based
on random numbers. When using a distributed hash table to resolve such
identifiers to network locations, the straightforward approach is to store the
network location directly in the hash table entry associated with an
identifier. When a mobile host contains a large number of resources, this
requires that all of the associated hash table entries must be updated when its
network address changes.
We propose an alternative approach where we store a host identifier in the
entry associated with a resource identifier and the actual network address of
the host in a separate host entry. This can drastically reduce the time
required for updating the distributed hash table when a mobile host changes its
network address. We also investigate under which circumstances our approach
should or should not be used. We evaluate and confirm the usefulness of our
approach with experiments run on top of OpenDHT.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 05:28:54 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Jun 2010 02:51:05 GMT"
}
] | 2011-04-07T00:00:00 | [
[
"Chung",
"Yoo",
""
]
] |
0706.0581 | Ko Honda | Vincent Colin and Ko Honda | Stabilizing the monodromy of an open book decomposition | 10 pages, 2 figures | null | null | null | math.GT | null | We prove that any mapping class on a compact oriented surface with nonempty
boundary can be made pseudo-Anosov and right-veering after a sequence of
positive stabilizations.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 05:18:55 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Colin",
"Vincent",
""
],
[
"Honda",
"Ko",
""
]
] |
0706.0582 | Jayeeta Chowdhury | Jayeeta Chowdhury, S. N. Karmakar and Bibhas Bhattacharyya | Ground state phase diagram and magnetoconductance of a one-dimensional
Hubbard superlattice at half-filling | 10 pages, 13 figures. to be published in Phys. Rev. B, vol. 75, Issue
23 (tentative) | null | 10.1103/PhysRevB.75.235117 | null | cond-mat.str-el | null | We have studied a one dimensional Hubbard superlattice with different Coulomb
correlations at alternating sites for a half-filled band. Mean field
calculations based on the Hartree-Fock approximation together with a real space
renormalization group technique were used to study the ground state of the
system. The phase diagrams obtained in these approaches agree with each other
from the weak to the intermediate coupling regime. The mean field results show
very quick convergence with system size. The renormalization group results
indicate a spatial modulation of local moments that was identified in some
previous work. Also we have studied the magnetoconductance of such
superlattices which reveals several interesting points.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 05:27:51 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 05:43:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chowdhury",
"Jayeeta",
""
],
[
"Karmakar",
"S. N.",
""
],
[
"Bhattacharyya",
"Bibhas",
""
]
] |
0706.0583 | Zahid Mahmood H | Zahid Hasan Mahmood, A.P. Shah, Abdul Kadir, M. R. Gokhale, Sandip
Ghosh, Arnab Bhattacharya and B. M. Arora | Determination of InN-GaN heterostructure band offsets from internal
photoemission measurements | 10 pages, 3 figures | null | null | null | cond-mat.mtrl-sci cond-mat.other | null | Band discontinuities at the InN-GaN heterointerface are experimentally
determined from internal photoemission spectroscopy measurements on n+ InN on
GaN epilayers. The photocurrent shows two threshold energies, one at 1.624 eV
and the other at 2.527 eV. From these we obtain the valence band offset 0.85 eV
and the conduction band offset 1.82 eV.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 05:30:31 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Mahmood",
"Zahid Hasan",
""
],
[
"Shah",
"A. P.",
""
],
[
"Kadir",
"Abdul",
""
],
[
"Gokhale",
"M. R.",
""
],
[
"Ghosh",
"Sandip",
""
],
[
"Bhattacharya",
"Arnab",
""
],
[
"Arora",
"B. M.",
""
]
] |
0706.0584 | Nicholas Parker | I. Corro, N. G. Parker and A. M. Martin | Rotation of an atomic Bose-Einstein condensate with and without a
quantized vortex | 15 pages, 8 figures | J. Phys. B: At. Mol. Opt. Phys. 40 (2007) 3615-3628 | 10.1088/0953-4075/40/18/004 | null | cond-mat.other | null | We theoretically examine the rotation of an atomic Bose-Einstein condensate
in an elliptical trap, both in the absence and presence of a quantized vortex.
Two methods of introducing the rotating potential are considered -
adiabatically increasing the rotation frequency at fixed ellipticity, and
adiabatically increasing the trap ellipticity at fixed rotation frequency.
Extensive simulations of the Gross-Pitaevskii equation are employed to map out
the points where the condensate becomes unstable and ultimately forms a vortex
lattice. We highlight the key features of having a quantized vortex in the
initial condensate. In particular, we find that the presence of the vortex
causes the instabilities to shift to lower or higher rotation frequencies,
depending on the direction of the vortex relative to the trap rotation.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 05:34:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Corro",
"I.",
""
],
[
"Parker",
"N. G.",
""
],
[
"Martin",
"A. M.",
""
]
] |
0706.0585 | Zhendong Zhao | Zhendong Zhao, Lei Yuan, Yuxuan Wang, Forrest Sheng Bao, Shunyi Zhang
Yanfei Sun | A Novel Model of Working Set Selection for SMO Decomposition Methods | 8 pages, 12 figures, it was submitted to IEEE International
conference of Tools on Artificial Intelligence | null | 10.1109/ICTAI.2007.99 | null | cs.LG cs.AI | null | In the process of training Support Vector Machines (SVMs) by decomposition
methods, working set selection is an important technique, and some exciting
schemes were employed into this field. To improve working set selection, we
propose a new model for working set selection in sequential minimal
optimization (SMO) decomposition methods. In this model, it selects B as
working set without reselection. Some properties are given by simple proof, and
experiments demonstrate that the proposed method is in general faster than
existing methods.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 05:55:07 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Zhao",
"Zhendong",
""
],
[
"Yuan",
"Lei",
""
],
[
"Wang",
"Yuxuan",
""
],
[
"Bao",
"Forrest Sheng",
""
],
[
"Sun",
"Shunyi Zhang Yanfei",
""
]
] |
0706.0586 | Woonyoung So | W. Y. So, T. Udagawa, K. S. Kim, S. W. Hong, B. T. Kim | Extended Optical Model Analyses of Elastic Scattering and Fusion Cross
Section Data for the 7Li+208Pb System at Near-Coulomb-Barrier Energies using
the Folding Potential | 7 figures, submitted to PRC | Phys.Rev.C76:024613,2007 | 10.1103/PhysRevC.76.024613 | null | nucl-th | null | Simultaneous $\chi^{2}$ analyses previously made for elastic scattering and
fusion cross section data for the $^{6}$Li+$^{208}$Pb system is extended to the
$^{7}$Li+$^{208}$Pb system at near-Coulomb-barrier energies based on the
extended optical model approach, in which the polarization potential is
decomposed into direct reaction (DR) and fusion parts. Use is made of the
double folding potential as a bare potential. It is found that the experimental
elastic scattering and fusion data are well reproduced without introducing any
normalization factor for the double folding potential and that both the DR and
fusion parts of the polarization potential determined from the $\chi^{2}$
analyses satisfy separately the dispersion relation. Further, we find that the
real part of the fusion portion of the polarization potential is attractive
while that of the DR part is repulsive except at energies far below the Coulomb
barrier energy. A comparison is made of the present results with those obtained
from the Continuum Discretized Coupled Channel (CDCC) calculations and a
previous study based on the conventional optical model with a double folding
potential. We also compare the present results for the $^7$Li+$^{208}$Pb system
with the analysis previously made for the $^{6}$Li+$^{208}$Pb system.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 05:56:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"So",
"W. Y.",
""
],
[
"Udagawa",
"T.",
""
],
[
"Kim",
"K. S.",
""
],
[
"Hong",
"S. W.",
""
],
[
"Kim",
"B. T.",
""
]
] |
0706.0587 | Paul Edmon | P. P. Edmon, T. W. Jones, H. Kang | Time Evolution of Cosmic Ray MHD Shocks and Their Emissions | 4 page, 2 figures, To appear in the Proceedings of the 30th ICRC,
Merida, Mexico | null | null | null | astro-ph | null | We present results of time evolution of oblique MHD plane shocks including
diffusive cosmic ray acceleration with backreaction on the plasma flows. The
simulations include self-consistent effects of finite Alfven wave propagation
and dissipation. From the computed cosmic ray particle phase space
distributions we calculate expected leptonic and hadronic emissions resulting
from interactions between the cosmic rays, magnetic fields, the thermal
particle population and relevant astrophysical photon fields.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 20:00:12 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 15:00:36 GMT"
},
{
"version": "v3",
"created": "Wed, 13 Jun 2007 19:35:49 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Edmon",
"P. P.",
""
],
[
"Jones",
"T. W.",
""
],
[
"Kang",
"H.",
""
]
] |
0706.0588 | Jesus I?arrea | Jesus Inarrea | Hall magnetoresistivity response under Microwave excitation revisited | 3 pages, 2 figures | Applied Physics Letters 90, 172118, (2007) | 10.1063/1.2734506 | null | cond-mat.mes-hall | null | We theoretically analyzed the microwave-induced modification of the Hall
magnetoresistivity in high mobility two-dimensional electron systems. These
systems present diagonal magnetoresistivity oscillations and zero-resistance
states when are subjected to microwave radiation. The most surprising
modification of the Hall magnetoresistivity is a periodic reduction which
correlates with a periodic increase in the diagonal resistivity. We present a
model that explains the experimental results considering that radiation affects
directly only the diagonal resistivity and the observed Hall resistivity
changes are coming from the tensor relationship between both of them.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 07:05:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Inarrea",
"Jesus",
""
]
] |
0706.0589 | Cai-Dian Lu | Cai-Dian Lu | QCD in hadronic B decays | 7 pages, with 1 figure, proceedings of the International Conference
On Nonperturbative Quantum Field Theory: Lattice And Beyond, 18-20 Dec 2004,
Guangzhou, Canton, China | Mod.Phys.Lett.A22:615-621,2007 | 10.1142/S0217732307023201 | null | hep-ph | null | The perturbative QCD approach is based on $k_T$ factorization, including the
Sudakov form factors so that to avoid the endpoint singularity. In this
approach, we calculate the charmless B decays like $B\to \pi\pi$ decays etc. to
produce the right number of branching ratios and also CP asymmetry parameters.
For final states with at least one charmed meson, like $B\to D\pi$ decays, our
results also agree with the experiments.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 07:05:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lu",
"Cai-Dian",
""
]
] |
0706.0590 | Alexander Olshanskiy | A. Yu. Olshanskii | On products of T-ideals in free algebras and free group algebras | 7 pages | null | null | null | math.RA math.RT | null | Let F be a field and A a free associative F-algebra or a group algebra of a
free group with an infinite set X of generators. We find a necessary and
sufficient condition for the inclusion I' into I, where I=I_1...I_k and
I'=I'_1...I'_l are any products of T-ideals in A. A canonical reformulation in
terms of products of group representation varieties answers a question posed in
1986
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 07:41:35 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Olshanskii",
"A. Yu.",
""
]
] |
0706.0591 | Francisco Navarro-Lerida | Francisco Navarro-Lerida | Perturbative Charged Rotating 5D Einstein-Maxwell Black Holes | RevTeX style, 4 pages, 5 figures | Gen.Rel.Grav.42:2891-2900,2010 | 10.1007/s10714-010-1033-1 | null | hep-th | null | We present perturbative charged rotating 5D Einstein-Maxwell black holes with
spherical horizon topology. The electric charge Q is the perturbative
parameter, the perturbations being performed up to 4th order. The expressions
for the relevant physical properties of these black holes are given. The
gyromagnetic ratio g, in particular, is explicitly shown to be non-constant in
higher order, and thus to deviate from its lowest order value, g=3. Comparison
of the perturbative analytical solutions with their non-perturbative numerical
counterparts shows remarkable agreement.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 07:13:08 GMT"
}
] | 2010-11-09T00:00:00 | [
[
"Navarro-Lerida",
"Francisco",
""
]
] |
0706.0592 | Luis Martinez | L. Martinez Alonso and E. Medina | Semiclassical expansions in the Toda hierarchy and the hermitian matrix
model | 22 pages | null | 10.1088/1751-8113/40/47/013 | null | nlin.SI | null | An iterative algorithm for determining a class of solutions of the
dispersionful 2-Toda hierarchy characterized by string equations is developed.
This class includes the solution which underlies the large N-limit of the
Hermitian matrix model in the one-cut case. It is also shown how the double
scaling limit can be naturally formulated in this scheme
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 07:29:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alonso",
"L. Martinez",
""
],
[
"Medina",
"E.",
""
]
] |
0706.0593 | Vicente Munoz | Vicente Mu\~noz | Hodge polynomials of the moduli spaces of rank 3 pairs | 23 pages, no figures. v2: sign in formula of Theorem 1.2 corrected.
arXiv admin note: text overlap with arXiv:math/0701642, arXiv:math/0606676 | Geometriae Dedicata, 2008, vol. 136, pp. 17-46 | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $X$ be a smooth projective curve of genus $g\geq 2$ over the complex
numbers. A holomorphic triple $(E_1,E_2,\phi)$ on $X$ consists of two
holomorphic vector bundles $E_1$ and $E_2$ over $X$ and a holomorphic map
$\phi:E_2 \to E_1$. There is a concept of stability for triples which depends
on a real parameter $\sigma$. In this paper, we determine the Hodge polynomials
of the moduli spaces of $\sigma$-stable triples with $\rk(E_1)=3$,
$\rk(E_2)=1$, using the theory of mixed Hodge structures. This gives in
particular the Poincar\'e polynomials of these moduli spaces. As a byproduct,
we recover the Hodge polynomial of the moduli space of odd degree rank 3 stable
vector bundles.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 07:40:04 GMT"
},
{
"version": "v2",
"created": "Sun, 16 Sep 2012 11:32:44 GMT"
}
] | 2012-09-18T00:00:00 | [
[
"Muñoz",
"Vicente",
""
]
] |
0706.0594 | Jean-Francois Pinton | Yoann Gasteuil (Phys-ENS), Woodrow Shew (Phys-ENS), Mathieu Gibert
(Phys-ENS), Francesca Chilla (Phys-ENS), Bernard Castaing (Phys-ENS),
Jean-Fran\c{c}ois Pinton (Phys-ENS) | Lagrangian temperature, velocity and local heat flux measurement in
Rayleigh-Benard convection | 4 pages | PRL 99, 234302 (2007) | 10.1103/PhysRevLett.99.234302 | null | physics.flu-dyn | null | We have developed a small, neutrally buoyant, wireless temperature sensor.
Using a camera for optical tracking, we obtain simultaneous measurements of
position and temperature of the sensor as it is carried along by the flow in
Rayleigh-B\'enard convection, at $Ra \sim 10^{10}$. We report on statistics of
temperature, velocity, and heat transport in turbulent thermal convection. The
motion of the sensor particle exhibits dynamics close to that of Lagrangian
tracers in hydrodynamic turbulence. We also quantify heat transport in plumes,
revealing self-similarity and extreme variations from plume to plume.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 07:45:29 GMT"
}
] | 2011-12-06T00:00:00 | [
[
"Gasteuil",
"Yoann",
"",
"Phys-ENS"
],
[
"Shew",
"Woodrow",
"",
"Phys-ENS"
],
[
"Gibert",
"Mathieu",
"",
"Phys-ENS"
],
[
"Chilla",
"Francesca",
"",
"Phys-ENS"
],
[
"Castaing",
"Bernard",
"",
"Phys-ENS"
],
[
"Pinton",
"Jean-François",
"",
"Phys-ENS"
]
] |
0706.0595 | Christoph Stephan A. | Christoph A. Stephan | Almost-Commutative Geometries Beyond the Standard Model II: New Colours | Revised version for publication in J.Phys.A with corrected Higgs
masses | J.Phys.A40:9941,2007 | 10.1088/1751-8113/40/32/017 | null | hep-th | null | We will present an extension of the standard model of particle physics in its
almost-commutative formulation. This extension is guided by the minimal
approach to almost-commutative geometries employed in [13], although the model
presented here is not minimal itself.
The corresponding almost-commutative geometry leads to a Yang-Mills-Higgs
model which consists of the standard model and two new fermions of opposite
electro-magnetic charge which may possess a new colour like gauge group. As a
new phenomenon, grand unification is no longer required by the spectral action.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:02:58 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jul 2007 14:27:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Stephan",
"Christoph A.",
""
]
] |
0706.0596 | Dremin | I.M. Dremin | Cherenkov gluons (predictions and proposals) | 19 pages, 4 figures, Appendix added | Int.J.Mod.Phys.A22:3087-3104,2007 | 10.1142/S0217751X07036920 | null | hep-ph nucl-th | null | The coherent hadron production analogous to Cherenkov radiation of photons
gives rise to the ring-like events. Being projected on the ring diameter they
produce the two-bump structure recently observed for the away-side jets at
RHIC. The position of the peaks and their height determine such properties of
the hadronic medium as its nuclear refractive index, the parton density, the
free path length and the energy loss of Cherenkov gluons. Cherenkov gluons may
be responsible for the asymmetry of dilepton mass spectra near rho-meson
observed in experiment. Beside comparatively low energy gluons observed at
RHIC, there could be high energy gluons at LHC, related to the high energy
region of positive real part of the forward scattering amplitude and possessing
different characteristics. This would allow to scan (x, Q^2)-plane determining
the parton densities in its various regions.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:05:02 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Jun 2007 08:40:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dremin",
"I. M.",
""
]
] |
0706.0597 | Elena Zemlyanaya Dr | K.V.Lukyanov, E.V.Zemlyanaya, I.N.Kuchtina, V.K.Lukyanov, Z.Metawei,
K.M.Hanna | Microscopic Approach in Inelastic Heavy-Ions Scattering with Excitation
of Nuclear Collective States | 9 pages, 4 figures, 1 table | null | null | null | nucl-th | null | In the density distribution of a deformed target-nucleus, the spherical
$\lambda = 0$ and the deformed $\lambda = 2$ parts were considered. On this
basis, the corresponding potential parts $U_0$ and $U^{(2)}_{int}$ of a double
-folding microscopic nucleus-nucleus optical potential are obtained. Then, for
these potentials and by using the coupled-channel technique (ECIS), the elastic
and inelastic amplitudes are calculated for $^{17}O$ heavy ion scattering on
$2^{+}$ collective excited state of various target nuclei. Besides, the same
cross-sections are calculated in the frame of an adiabatic approach of the
eikonal approximation, where the inelastic amplitude is the linear function of
$U^{(2)}_{int}$. Both the obtained results are compared with the experimental
data, and also discuss their efficiency in predicting the deformation
parameters of nuclei.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:10:37 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 07:04:39 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Lukyanov",
"K. V.",
""
],
[
"Zemlyanaya",
"E. V.",
""
],
[
"Kuchtina",
"I. N.",
""
],
[
"Lukyanov",
"V. K.",
""
],
[
"Metawei",
"Z.",
""
],
[
"Hanna",
"K. M.",
""
]
] |
0706.0598 | Peter Kuchment | Mark Agranovsky and Peter Kuchment | Uniqueness of reconstruction and an inversion procedure for
thermoacoustic and photoacoustic tomography | null | P. Kuchment and M. Agranovsky, Uniqueness of reconstruction and an
inversion procedure for thermoacoustic and photoacoustic tomography, Inverse
Problems 23 (2007) 2089-2102. | 10.1088/0266-5611/23/5/016 | null | math.NA math-ph math.AP math.MP | null | The paper contains a simple approach to reconstruction in Thermoacoustic and
Photoacoustic Tomography. The technique works for any geometry of point
detectors placement and for variable sound speed satisfying a non-trapping
condition. A uniqueness of reconstruction result is also obtained.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:24:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Agranovsky",
"Mark",
""
],
[
"Kuchment",
"Peter",
""
]
] |
0706.0599 | Yoav Moriah | Martin Lustig and Yoav Moriah | High distance Heegaard splittings via fat train tracks | 25 pages no figures. to appear in Proceedings of "Knots Groups and
3-manifolds" Marseilles France 2006 | null | null | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define "fat" train tracks and use them to give a combinatorial criterion
for the Hempel distance of Heegaard splittings for closed orientable
3-manifolds. We apply this criterion to 3-manifolds obtained from surgery on
knots in the three sphere.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:30:51 GMT"
},
{
"version": "v2",
"created": "Sun, 6 Jul 2008 12:49:07 GMT"
}
] | 2008-07-06T00:00:00 | [
[
"Lustig",
"Martin",
""
],
[
"Moriah",
"Yoav",
""
]
] |
0706.0600 | Binoy Talukdar None | Debabrata Pal, Sk. Golam Ali and B. Talukdar | Embedded soliton solutions : A variational study | 4 pages, 2 figures | null | null | null | nlin.SI | null | We use a variational method to construct soliton solutions for systems
characterized by opposing dispersion and competing nonlinearities at
fundamental and second harmonics. We show that both ordinary and embedded
solitons tend to gain energy when the second harmonic field becomes weaker than
the first harmonic field.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:34:53 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Pal",
"Debabrata",
""
],
[
"Ali",
"Sk. Golam",
""
],
[
"Talukdar",
"B.",
""
]
] |
0706.0601 | Mauro Antezza Mr | Mauro Antezza, Franco Dalfovo, Lev P. Pitaevskii, Sandro Stringari | Dark solitons in a superfluid Fermi gas | 5 pages, 3 figures | Phys. Rev. A 76, 043610 (2007) | 10.1103/PhysRevA.76.043610 | null | cond-mat.stat-mech cond-mat.supr-con | null | We investigate the behavior of dark solitons in a superfluid Fermi gas along
the BCS-BEC crossover by solving the Bogoliubov - de Gennes equations and
looking for real and odd solutions for the order parameter. We show that in the
resonance unitary region, where the scattering length is large, the density
profile of the soliton has a deep minimum, differently from what happens in the
BCS regime. The superfluid gap is found to be significantly quenched by the
presence of the soliton due to the occurrence of Andreev fermionic bound states
localized near the nodal plane of the order parameter.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:36:00 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Oct 2007 08:55:06 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Antezza",
"Mauro",
""
],
[
"Dalfovo",
"Franco",
""
],
[
"Pitaevskii",
"Lev P.",
""
],
[
"Stringari",
"Sandro",
""
]
] |
0706.0602 | Paolo Calvani | A. Nucara (1), P. Maselli (1), M. Del Bufalo (1), M. Cestelli Guidi
(2), J. Garcia (3), P. Orgiani (4), L. Maritato (4), and P. Calvani (1) ((1)
CNR-INFM and Universita' La Sapienza, Roma, Italy (2) LNF-INFN, Frascati,
Italy (3) Universidad de Zaragoza, Spain (4) CNR-INFM and Universita' di
Salerno, Italy) | Effect of Mn substitution by Ga on the optical properties of a metallic
manganite | 8 pages including 7 figures | Phys. Rev. B 77, 064431 (2008) | 10.1103/PhysRevB.77.064431 | null | cond-mat.str-el | null | In a metallic manganite like La(2/3)Sr(1/3)MnO(3), the substitution of Mn(+3)
by Ga(+3) dilutes the ferromagnetic order and locally cancels the Jahn-Teller
distortion, without heavily affecting the crystal structure. One can thus
follow the changes in the charge dynamics induced by Ga, until the
ferro-metallic manganite is turned into an insulator. Here this phenomenon is
studied in detail through the infrared reflectivity of five samples of
La(2/3)Sr(1/3)Mn(1-x)Ga(x)O(3), with x increasing from 0 to 0.30 and for 50 < T
< 320 K. A simple model which links the measured optical parameters to the
magnetization M(x, T) well describes the behavior of the plasma frequency, the
scattering rate, and the mid-infrared absorption along the metal-to-insulator
transition.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:39:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nucara",
"A.",
""
],
[
"Maselli",
"P.",
""
],
[
"Del Bufalo",
"M.",
""
],
[
"Guidi",
"M. Cestelli",
""
],
[
"Garcia",
"J.",
""
],
[
"Orgiani",
"P.",
""
],
[
"Maritato",
"L.",
""
],
[
"Calvani",
"P.",
""
]
] |
0706.0603 | Sergey Solodukhin N. | G. W. Gibbons and S. N. Solodukhin | The Geometry of Large Causal Diamonds and the No Hair Property of
Asymptotically de-Sitter Spacetimes | 13 pages, 2 figures, Latex; references added | Phys.Lett.B652:103-110,2007 | 10.1016/j.physletb.2007.06.073 | null | hep-th astro-ph gr-qc math.DG | null | In a previous paper we obtained formulae for the volume of a causal diamond
or Alexandrov open set $I^+(p) \cap I^-(q)$ whose duration $\tau(p,q) $ is
short compared with the curvature scale. In the present paper we obtain
asymptotic formulae valid when the point $q$ recedes to the future boundary
${\cal I}^+$ of an asymptotically de-Sitter spacetime. The volume (at fixed
$\tau$) remains finite in this limit and is given by the universal formula
$V(\tau) = {4\over 3}\pi (2\ln \cosh{\tau\over 2}-\tanh^2{\tau\over 2})$ plus
corrections (given by a series in $e^{-t_q}$) which begin at order $e^{-4t_q}$.
The coefficents of the corrections depend on the geometry of ${\cal I}^+$. This
behaviour is shown to be consistent with the no-hair property of cosmological
event horizons and with calculations of de-Sitter quasinormal modes in the
literature.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:52:14 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2007 09:55:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gibbons",
"G. W.",
""
],
[
"Solodukhin",
"S. N.",
""
]
] |
0706.0604 | Wilberd van der Kallen | Vasudevan Srinivas and Wilberd van der Kallen | Finite Schur filtration dimension for modules over an algebra with Schur
filtration | 22 pages; final version | Transformation Groups, Vol. 14, No. 3, 2009, pp. 695-711 | 10.1007/S00031-009-9054-0 | null | math.RT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let G be GL_N or SL_N as reductive linear algebraic group over a field k of
positive characteristic p. We prove several results that were previously
established only when N < 6 or p > 2^N. Let G act rationally on a finitely
generated commutative k-algebra A. Assume that A as a G-module has a good
filtration or a Schur filtration. Let M be a noetherian A-module with
compatible G action. Then M has finite good/Schur filtration dimension, so that
there are at most finitely many nonzero H^i(G,M). Moreover these H^i(G,M) are
noetherian modules over the ring of invariants A^G. Our main tool is a
resolution involving Schur functors of the ideal of the diagonal in a product
of Grassmannians.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:54:27 GMT"
},
{
"version": "v2",
"created": "Thu, 15 May 2008 12:29:19 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Nov 2008 15:40:59 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Srinivas",
"Vasudevan",
""
],
[
"van der Kallen",
"Wilberd",
""
]
] |
0706.0605 | Shintaro Ishiwata | Shintaro Ishiwata, Wataru Kobayashi, Ichiro Terasaki, Kenichi Kato,
Masaki Takata | Structure-Property Relationship in the Ordered-Perovskite- Related Oxide
Sr3.12Er0.88Co4O10.5 | to be published in Phys. Rev. B Rapid Communication | Phys. Rev. B 75, 220406(R) (2007) | 10.1103/PhysRevB.75.220406 | null | cond-mat.str-el cond-mat.mtrl-sci | null | Synchrotron X-ray diffraction patterns were measured and analyzed for a
polycrystalline sample of the room-temperature ferromagnet Sr3.12Er0.88Co4O10.5
from 300 to 650 K, from which two structural phase transitions were found to
occur successively. The higher-temperature transition at 509 K is driven by
ordering of the oxygen vacancies, which is closely related to the metallic
state at high temperatures. The lower-temperature transition at 360 K is of
first order, at which the ferromagnetic state suddenly appears with exhibiting
a jump in magnetization and resistivity. Based on the refined structure,
possible spin and orbital models for the magnetic order are proposed.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 08:57:42 GMT"
},
{
"version": "v2",
"created": "Sat, 23 Jun 2007 12:26:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ishiwata",
"Shintaro",
""
],
[
"Kobayashi",
"Wataru",
""
],
[
"Terasaki",
"Ichiro",
""
],
[
"Kato",
"Kenichi",
""
],
[
"Takata",
"Masaki",
""
]
] |
0706.0606 | Attila Andai | Attila Andai | On the geometry of generalized Gaussian distributions | 22 pages | Journal of Multivariate Analysis, 100(4):777-793, 2009 | null | null | math.PR math.DG | null | In this paper we consider the space of those probability distributions which
maximize the $q$-R\'enyi entropy. These distributions have the same parameter
space for every $q$, and in the $q=1$ case these are the normal distributions.
Some methods to endow this parameter space with Riemannian metric is presented:
the second derivative of the $q$-R\'enyi entropy, Tsallis-entropy and the
relative entropy give rise to a Riemannian metric, the Fisher-information
matrix is a natural Riemannian metric, and there are some geometrically
motivated metrics which were studied by Siegel, Calvo and Oller, Lovri\'c,
Min-Oo and Ruh. These metrics are different therefore our differential
geometrical calculations based on a unified metric, which covers all the above
mentioned metrics among others. We also compute the geometrical properties of
this metric, the equation of the geodesic line with some special solutions, the
Riemann and Ricci curvature tensors and scalar curvature. Using the
correspondence between the volume of the geodesic ball and the scalar curvature
we show how the parameter $q$ modulates the statistical distinguishability of
close points. We show that some frequently used metric in quantum information
geometry can be easily recovered from classical metrics.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 09:03:26 GMT"
}
] | 2017-08-24T00:00:00 | [
[
"Andai",
"Attila",
""
]
] |
0706.0607 | Abhijit Banerjee | B.Bagchi | Position-dependent mass models and their nonlinear characterization | 8 Pages, Latex version, Two new references are added, To appear in
J.Phys.A (Fast Track Communication) | J.Phys.A40:F1041-F1046,2007 | 10.1088/1751-8113/40/49/F01 | null | quant-ph hep-th math-ph math.MP | null | We consider the specific models of Zhu-Kroemer and BenDaniel-Duke in a
sech$^{2}$-mass background and point out interesting correspondences with the
stationary 1-soliton and 2-soliton solutions of the KdV equation in a
supersymmetric framework.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 09:03:40 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Nov 2007 10:33:53 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bagchi",
"B.",
""
]
] |
0706.0608 | Matteo Petrera | Fabio Musso, Matteo Petrera | A class of bi-Hamiltonian systems associated with deformed
Reyman-Semenov-Tian-Shansky tensors | This paper has been withdrawn | null | null | null | math-ph math.MP | null | This paper has been withdrawn. The authors realized that the obtained results
were not new.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 09:03:40 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Oct 2007 14:41:38 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Musso",
"Fabio",
""
],
[
"Petrera",
"Matteo",
""
]
] |
0706.0609 | Capponi Sylvain | S. Capponi, G. Roux, P. Lecheminant, P. Azaria, E. Boulat, S. R. White | Molecular superfluid phase in systems of one-dimensional multicomponent
fermionic cold atoms | published version | Phys. Rev. A 77, 013624 (2008) | 10.1103/PhysRevA.77.013624 | null | cond-mat.str-el | null | We study a simple model of N-component fermions with contact interactions
which describes fermionic atoms with N=2F+1 hyperfine states loaded into a
one-dimensional optical lattice. We show by means of analytical and numerical
approaches that, for attractive interaction, a quasi-long-range molecular
superfluid phase emerges at low density. In such a phase, the pairing
instability is strongly suppressed and the leading instability is formed from
bound-states made of N fermions. At small density, the molecular superfluid
phase is generic and exists for a wide range of attractive contact interactions
without an SU(N) symmetry between the hyperfine states.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 09:08:17 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 09:04:08 GMT"
}
] | 2011-10-13T00:00:00 | [
[
"Capponi",
"S.",
""
],
[
"Roux",
"G.",
""
],
[
"Lecheminant",
"P.",
""
],
[
"Azaria",
"P.",
""
],
[
"Boulat",
"E.",
""
],
[
"White",
"S. R.",
""
]
] |
0706.0610 | Dori Reichmann | Micha Berkooz, Zohar Komargodski, and Dori Reichmann | Thermal AdS(3), BTZ and competing winding modes condensation | 40 pages, 5 figures, JHEP3 format. v2: added references, minor
corrections and clarifications | JHEP 0712:020,2007 | 10.1088/1126-6708/2007/12/020 | WIS/06/07-JUN-DPP | hep-th | null | We study the thermal physics of AdS(3) and the BTZ black hole when embedded
in String theory. The exact calculation of the Hagedorn temperature in TAdS(3)
is reinterpreted as the appearance of a winding tachyon both in AdS(3) and BTZ.
We construct a dual framework for analyzing the phases of the system. In this
dual framework, tachyon condensation and geometric capping appear on the same
footing, bridging the usual gap of connecting tachyon condensation to
modifications of geometry. This allows us to construct in a natural way a
candidate for the unstable phase, analogous to a small black hole in higher
dimensions. Additional peculiar effects associated with the Hagedorn
temperature and the Hawking-Page transition, some to do with the asymptotic
structure of AdS(3) and some with strong curvature effects, are analyzed and
explained.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 14:30:04 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Sep 2007 12:05:46 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Berkooz",
"Micha",
""
],
[
"Komargodski",
"Zohar",
""
],
[
"Reichmann",
"Dori",
""
]
] |
0706.0611 | Remco Hofstad van der | Remco van der Hofstad, Mark Holmes, Gordon Slade | An extension of the inductive approach to the lace expansion | null | null | null | null | math.PR | null | We extend the inductive approach to the lace expansion, previously developed
to study models with critical dimension 4, to be applicable more generally. In
particular, the result of this note has recently been used to prove Gaussian
asymptotic behaviour for the Fourier transform of the two-point function for
sufficiently spread-out lattice trees in dimensions d>8, and it is potentially
also applicable to percolation in dimensions d>6.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 09:35:09 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"van der Hofstad",
"Remco",
""
],
[
"Holmes",
"Mark",
""
],
[
"Slade",
"Gordon",
""
]
] |
0706.0612 | Michael Pawellek | Michael Pawellek | Quasi-doubly periodic solutions to a generalized Lame equation | 15 pages,1 table, accepted for publication in Journal of Physics A | J. Phys. A 40, 7673 (2007) | 10.1088/1751-8113/40/27/016 | FAU-TP3-07/04 | math-ph hep-th math.MP | null | We consider the algebraic form of a generalized Lame equation with five free
parameters. By introducing a generalization of Jacobi's elliptic functions we
transform this equation to a 1-dim time-independent Schroedinger equation with
(quasi-doubly) periodic potential. We show that only for a finite set of
integral values for the five parameters quasi-doubly periodic eigenfunctions
expressible in terms of generalized Jacobi functions exist. For this purpose we
also establish a relation to the generalized Ince equation.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 09:45:25 GMT"
}
] | 2012-10-02T00:00:00 | [
[
"Pawellek",
"Michael",
""
]
] |
0706.0613 | Paul Clark Dr | Paul C. Clark and Simon C. O. Glover and Ralf S. Klessen | The First Stellar Cluster | 9 pages, 6 figures. Accepted by ApJ for publication | AIP Conf.Proc.990:79-81,2008 | 10.1063/1.2905678 | null | astro-ph | null | We report results from numerical simulations of star formation in the early
universe that focus on gas at very high densities and very low metallicities.
We argue that the gas in the central regions of protogalactic halos will
fragment as long as it carries sufficient angular momentum. Rotation leads to
the build-up of massive disk-like structures which fragment to form protostars.
At metallicities Z ~ 10^-5 Zsun, dust cooling becomes effective and leads to a
sudden drop of temperature at densities above n = 10^12 cm^-3. This induces
vigorous fragmentation, leading to a very densely-packed cluster of low-mass
stars. This is the first stellar cluster. The mass function of stars peaks
below 1 Msun, similar to what is found in the solar neighborhood, and
comparable to the masses of the very-low metallicity subgiant stars recently
discovered in the halo of our Milky Way. We find that even purely primordial
gas can fragment at densities 10^14 cm^-3 < n < 10^16 cm^-3, although the
resulting mass function contains only a few objects (at least a factor of ten
less than the Z = 10^-5 Zsun mass function), and is biased towards higher
masses. A similar result is found for gas with Z = 10^-6 Zsun. Gas with Z <=
10^-6 Zsun behaves roughly isothermally at these densities (with polytropic
exponent gamma ~ 1.06) and the massive disk-like structures that form due to
angular momentum conservation will be marginally unstable. As fragmentation is
less efficient, we expect stars with Z <= 10^-6 Zsun to be massive, with masses
in excess of several tens of solar masses, consistent with the results from
previous studies.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 09:41:56 GMT"
},
{
"version": "v2",
"created": "Mon, 15 Oct 2007 13:03:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Clark",
"Paul C.",
""
],
[
"Glover",
"Simon C. O.",
""
],
[
"Klessen",
"Ralf S.",
""
]
] |
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