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801.4573 | Thomas Wiegelmann | T. Wiegelmann, B. Inhester, A. Lagg, S.K. Solanki | How to use magnetic field information for coronal loop identification? | 14 pages, 3 figures | Solar Phys.228:67,2005 | 10.1007/s11207-005-2511-6 | null | astro-ph | null | The structure of the solar corona is dominated by the magnetic field because
the magnetic pressure is about four orders of magnitude higher than the plasma
pressure. Due to the high conductivity the emitting coronal plasma (visible
e.g. in SOHO/EIT) outlines the magnetic field lines. The gradient of the
emitting plasma structures is significantly lower parallel to the magnetic
field lines than in the perpendicular direction. Consequently information
regarding the coronal magnetic field can be used for the interpretation of
coronal plasma structures. We extrapolate the coronal magnetic field from
photospheric magnetic field measurements into the corona. The extrapolation
method depends on assumptions regarding coronal currents, e.g. potential fields
(current free) or force-free fields (current parallel to magnetic field). As a
next step we project the reconstructed 3D magnetic field lines on an EIT-image
and compare with the emitting plasma structures. Coronal loops are identified
as closed magnetic field lines with a high emissivity in EIT and a small
gradient of the emissivity along the magnetic field.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:09:31 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Wiegelmann",
"T.",
""
],
[
"Inhester",
"B.",
""
],
[
"Lagg",
"A.",
""
],
[
"Solanki",
"S. K.",
""
]
] | [
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801.4574 | David Skinner | Freddy Cachazo, David Skinner | On the structure of scattering amplitudes in N=4 super Yang-Mills and
N=8 supergravity | 41 pages, 16 figures; references added, clarification added in
section 6B | null | null | null | hep-th | null | Exploiting singularities in Feynman integrals to get information about
scattering amplitudes has been particularly useful at one-loop in theories
where no triangles or bubbles appear. At higher loops the integrals possess
subtle singularities. In this paper we give these singularities a physical
interpretation and show how they turn tedious computations into purely
pictorial manipulations. We illustrate our methods with various examples from
the computation of four-particle amplitudes in N=4 super Yang-Mills and N=8
supergravity. Along the way we find clues towards an understanding i) of the
rung-rule as a consequence of infra-red singularities, ii) of the non rung-rule
integrals included in the basis as corrections to the rung-rule and iii) of the
coefficients - including signs - of these two types of contribution. The role
of corrections is to cancel unphysical singularities generically present in
rung-rule integrals. A further byproduct, coming from the fact such unphysical
singularities are located where conformal cross-ratios become unity, is the
possibility of understanding the dual conformal invariance ansatz for
constructing the basis of four-particle amplitudes in N=4 super Yang-Mills.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:15:52 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 08:43:43 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Cachazo",
"Freddy",
""
],
[
"Skinner",
"David",
""
]
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801.4575 | Mikhail Gorshteyn | Mikhail Gorchtein and Charles J. Horowitz | Analyzing power in elastic scattering of the electrons off a spin-0
target | 6 pages, 8 figure, one table; submitted to Phys.Rev.C; one figure
corrrected | Phys.Rev.C77:044606,2008 | 10.1103/PhysRevC.77.044606 | null | nucl-th nucl-ex | null | We consider the analyzing power on a spin-0 nuclear target. This observable
is related to the imaginary part of the two-photon-exchange (box) diagram. We
consider the contributions of elastic and inelastic intermediate states. The
former requires knowledge of the elastic nuclear form factor, while the latter
uses the optical theorem as input. The elastic contribution scales as the
nuclear charge $Z$, while the inelastic contribution as the ratio of the atomic
number and nuclear charge, $A/Z$. We provide estimates for $^4$He and
$^{208}$Pb, in the kinematics of existing or upcoming experiments. In both
cases, we predict negative values of a few parts per million, and the dominant
contribution is due to inelastic contributions. The analyzing power can
contribute a substantial systematic error in parity-violating experiments.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 22:13:29 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 17:17:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gorchtein",
"Mikhail",
""
],
[
"Horowitz",
"Charles J.",
""
]
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] |
801.4576 | Yu-Ming Lin | Yu-Ming Lin and Phaedon Avouris | Strong Suppression of Electrical Noise in Bilayer Graphene Nano Devices | null | null | 10.1021/nl080241l | null | cond-mat.mtrl-sci | null | Low-frequency 1/f noise is ubiquitous, and dominates the signal-to-noise
performance in nanodevices. Here we investigate the noise characteristics of
single-layer and bilayer graphene nano-devices, and uncover an unexpected 1/f
noise behavior for bilayer devices. Graphene is a single layer of graphite,
where carbon atoms form a 2D honeycomb lattice. Despite the similar
composition, bilayer graphene (two graphene monolayers stacked in the natural
graphite order) is a distinct 2D system with a different band structure and
electrical properties. In graphene monolayers, the 1/f noise is found to follow
Hooge's empirical relation with a noise parameter comparable to that of bulk
semiconductors. However, this 1/f noise is strongly suppressed in bilayer
graphene devices, and exhibits an unusual dependence on the carrier density,
different from most other materials. The unexpected noise behavior in graphene
bilayers is associated with its unique band structure that varies with the
charge distribution among the two layers, resulting in an effective screening
of potential fluctuations due to external impurity charges. The findings here
point to exciting opportunities for graphene bilayers in low-noise
applications.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 22:54:17 GMT"
}
] | 2008-02-29T00:00:00 | [
[
"Lin",
"Yu-Ming",
""
],
[
"Avouris",
"Phaedon",
""
]
] | [
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] |
801.4577 | Duncan Kilburn | Duncan Kilburn and Paul E. Sokol | Monolayer sorption of neon in mesoporous silica glass as monitored by
WAXS | 23 pages, 5 figures. To be published in Physical Review E | null | 10.1103/PhysRevE.77.021603 | null | cond-mat.mtrl-sci | null | We report measurements of the x-ray scattering intensity as mesoporous
glasses are filled with Neon. We outline a simple model to account for the
non-linear increase in the intensity of the first peak in a liquid-like
diffraction pattern as a monolayer is formed. This allows us to demonstrate an
approach for surface area determination which does not rely on thermodynamic
models, and is therefore complimentary to existing models.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 22:26:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kilburn",
"Duncan",
""
],
[
"Sokol",
"Paul E.",
""
]
] | [
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] |
801.4578 | Kate Brand | Kate Brand, Dan W. Weedman, Vandana Desai, Emeric Le Floc'h, Lee
Armus, Arjun Dey, Jim R. Houck, Buell T. Jannuzi, Howard A. Smith, B. T.
Soifer | Spitzer Mid-Infrared Spectroscopy of Distant X-ray Luminous AGN | 13 pages, ApJ accepted | null | 10.1086/587167 | null | astro-ph | null | We present mid-infrared spectroscopy of a sample of 16 optically faint
infrared luminous galaxies obtained with the Infrared Spectrograph (IRS) on the
Spitzer Space Telescope. These sources were jointly selected from Spitzer and
Chandra imaging surveys in the NDWFS Bootes field and were selected from their
bright X-ray fluxes to host luminous AGN. None of the spectra show significant
emission from polycyclic aromatic hydrocarbons (PAHs; 6.2um equivalent widths
<0.2um), consistent with their infrared emission being dominated by AGN. Nine
of the X-ray sources show 9.7um silicate absorption features. Their redshifts
are in the range 0.9<z<2.6, implying infrared luminosities of
log(L{IR})=12.5-13.6 solar luminosities. The average silicate absorption
strength is not as strong as that of previously targeted optically faint
infrared luminous galaxies with similar mid-infrared luminosities implying that
the X-ray selection favors sources behind a smaller column of Si-rich dust than
non-X-ray selection. Seven of the X-ray sources have featureless power-law
mid-IR spectra. We argue that the featureless spectra likely result from the
sources having weak or absent silicate and PAH features rather than the sources
lying at higher redshifts where these features are shifted out of the IRS
spectral window. We investigate whether there are any correlations between
X-ray and infrared properties and find that sources with silicate absorption
features tend to have fainter X-ray fluxes and harder X-ray spectra, indicating
a weak relation between the amount of silicate absorption and column density of
X-ray-absorbing gas.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 16:30:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brand",
"Kate",
""
],
[
"Weedman",
"Dan W.",
""
],
[
"Desai",
"Vandana",
""
],
[
"Floc'h",
"Emeric Le",
""
],
[
"Armus",
"Lee",
""
],
[
"Dey",
"Arjun",
""
],
[
"Houck",
"Jim R.",
""
],
[
"Jannuzi",
"Buell T.",
""
],
[
"Smith",
"Howard A.",
""
],
[
"Soifer",
"B. T.",
""
]
] | [
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] |
801.4579 | Edward Taylor | Edward Taylor | The Josephson relation for the superfluid density in the BCS-BEC
crossover | Published version | Phys. Rev. B 77 144521 (2008) | 10.1103/PhysRevB.77.144521 | null | cond-mat.other | null | The Josephson relation for the superfluid density is derived for a Fermi
superfluid in the BCS-BEC crossover. This identity extends the original
Josephson relation for Bose superfluids. It gives a simple exact relation
between the superfluid density $\rho_s$ and the broken-symmetry Cooper pair
order parameter $\Delta_0$ in terms of the infrared limit of the pair
fluctuation propagator. The same expression holds through the entire BCS-BEC
crossover, describing the superfluid density of a weak-coupling BCS superfluid
as well as the superfluid density of a Bose condensate of dimer molecules.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 22:56:10 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Apr 2008 08:47:21 GMT"
}
] | 2008-12-12T00:00:00 | [
[
"Taylor",
"Edward",
""
]
] | [
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] |
801.458 | Hashini Mohottala Dr. | Hashini E. Mohottala (1), B. O. Wells (1), J. I. Budnick (1), W. A.
Hines (1), Ch. Niedermayer (2), F. C. Chou (3) ((1). Department of Physics,
University of Connecticut, Storrs, CT, USA, (2). Laboratory for Neutron
Scattering, ETHZ & PSI, Villigen, Switzerland, (3). Center for Condensed
Matter Sciences, National Taiwan University, Taipei, Taiwan) | Flux pinning and phase separation in oxygen rich La2-xSrxCuO4+y system | 4 figures 8 pages Submitted to PRB | null | 10.1103/PhysRevB.78.064504 | null | cond-mat.supr-con cond-mat.str-el | null | We have studied the magnetic characteristics of a series of super-oxygenated
La2-xSrxCuO4+y samples. As shown in previous work, these samples spontaneously
phase separate into an oxygen rich superconducting phase with a TC near 40 K
and an oxygen poor magnetic phase that also orders near 40 K. All samples
studied are highly magnetically reversible even to low temperatures. Although
the internal magnetic regions of these samples might be expected to act as
pinning sites, our present study shows that they do not favor flux pinning.
Flux pinning requires a matching condition between the defect and the
superconducting coherence length. Thus, our results imply that the magnetic
regions are too large to act as pinning centers. This also implies that the
much greater flux pinning in typical La2-xSrxCuO4 materials is the result of
nanoscale inhomogeneities that grow to become the large magnetic regions in the
super-oxygenated materials. The superconducting regions of the phase separated
materials are in that sense cleaner and more homogenous than in the typical
cuprate superconductor.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 22:51:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mohottala",
"Hashini E.",
""
],
[
"Wells",
"B. O.",
""
],
[
"Budnick",
"J. I.",
""
],
[
"Hines",
"W. A.",
""
],
[
"Niedermayer",
"Ch.",
""
],
[
"Chou",
"F. C.",
""
]
] | [
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] |
801.4581 | Martin Scharlemann | Ruifeng Qiu and Martin Scharlemann | A proof of the Gordon Conjecture | 23 pages, 17 figures. Revised version incorporates Ruifeng Qiu as
coauthor | null | null | UCSB Math 2008-06 | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A combinatorial proof of the Gordon Conjecture: The sum of two Heegaard
splittings is stabilized if and only if one of the two summands is stabilized.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 23:09:01 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Sep 2008 16:40:22 GMT"
}
] | 2008-09-08T00:00:00 | [
[
"Qiu",
"Ruifeng",
""
],
[
"Scharlemann",
"Martin",
""
]
] | [
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] |
801.4582 | Tadafumi Ohsaku | Tadafumi Ohsaku | Dynamical CP-Violation: A Supplement to the Kobayashi-Maskawa Matrix in
the Standard Model | 3 pages, to be submitted | null | null | null | hep-ph | null | A possible supplementary mechanism of CP-violation to the Kobayashi-Maskawa
theory is considered in the context of dynamical symmetry breaking.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:05:32 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Ohsaku",
"Tadafumi",
""
]
] | [
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] |
801.4583 | Philip Chang | Philip Chang (1), Anatoly Spitkovsky (2), Jonathan Arons (1) ((1)
Univ. of California, Berkeley (2) Princeton University) | Long Term Evolution of Magnetic Turbulence in Relativistic Collisionless
Shocks | 4 pages, 3 figures, contributed talk at the workshop: High Energy
Phenomena in Relativistic Outflows (HEPRO), Dublin, 24-28 September 2007;
Downsampled version for arXiv. Full resolution version available at
http://astro.berkeley.edu/~pchang/proceedings.pdf | Int.J.Mod.Phys.D17:1769-1775,2008 | 10.1142/S021827180801339X | null | astro-ph | null | We study the long term evolution of magnetic fields generated by an initially
unmagnetized collisionless relativistic $e^+e^-$ shock. Our 2D particle-in-cell
numerical simulations show that downstream of such a Weibel-mediated shock,
particle distributions are approximately isotropic, relativistic Maxwellians,
and the magnetic turbulence is highly intermittent spatially, nonpropagating,
and decaying. Using linear kinetic theory, we find a simple analytic form for
these damping rates. Our theory predicts that overall magnetic energy decays
like $(\omega_p t)^{-q}$ with $q \sim 1$, which compares favorably with
simulations, but predicts overly rapid damping of short wavelength modes.
Magnetic trapping of particles within the magnetic structures may be the origin
of this discrepancy. We conclude that initially unmagnetized relativistic
shocks in electron-positron plasmas are unable to form persistent downstream
magnetic fields. These results put interesting constraints on synchrotron
models for the prompt and afterglow emission from GRBs.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 23:16:16 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Chang",
"Philip",
""
],
[
"Spitkovsky",
"Anatoly",
""
],
[
"Arons",
"Jonathan",
""
]
] | [
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] |
801.4584 | Abel Camacho Mr. | Alfredo Macias, Abel Camacho, Jutta Kunz, Claus Laemmerzahl | Midisuperspace Supersymmetric Quantum Cosmology | Accepted in Physical Review D | Phys.Rev.D77:064009,2008 | 10.1103/PhysRevD.77.064009 | null | gr-qc | null | We investigate the canonical quantization in the framework of N=1 simple
supergravity for the case of a very simple gravitational midisuperspace
described by Gowdy $T^3$ cosmological models. We consider supersymmetric
quantum cosmology in the mentioned midisuperspace, where a matrix
representation for the gravitino covector--spinor is used. The full Lorentz
constraint and its implications for the wave function of the universe are
analyzed in detail. We found that there are indeed physical states in the
midisuperspace sector of the theory in contrast to the case of minisuperspace
where there exist no physical states.
| [
{
"version": "v1",
"created": "Tue, 29 Jan 2008 23:58:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Macias",
"Alfredo",
""
],
[
"Camacho",
"Abel",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Laemmerzahl",
"Claus",
""
]
] | [
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] |
801.4585 | Piotr Faliszewski | Piotr Faliszewski, Lane A. Hemaspaandra | The Complexity of Power-Index Comparison | 12 pages | null | null | URCS TR-2008-929 | cs.CC cs.GT | null | We study the complexity of the following problem: Given two weighted voting
games G' and G'' that each contain a player p, in which of these games is p's
power index value higher? We study this problem with respect to both the
Shapley-Shubik power index [SS54] and the Banzhaf power index [Ban65,DS79]. Our
main result is that for both of these power indices the problem is complete for
probabilistic polynomial time (i.e., is PP-complete). We apply our results to
partially resolve some recently proposed problems regarding the complexity of
weighted voting games. We also study the complexity of the raw Shapley-Shubik
power index. Deng and Papadimitriou [DP94] showed that the raw Shapley-Shubik
power index is #P-metric-complete. We strengthen this by showing that the raw
Shapley-Shubik power index is many-one complete for #P. And our strengthening
cannot possibly be further improved to parsimonious completeness, since we
observe that, in contrast with the raw Banzhaf power index, the raw
Shapley-Shubik power index is not #P-parsimonious-complete.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 00:10:07 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Faliszewski",
"Piotr",
""
],
[
"Hemaspaandra",
"Lane A.",
""
]
] | [
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] |
801.4586 | Patrick B. Hall | Patrick B. Hall (1), Aaron J. Maxwell (1) ((1) York University,
Toronto, Canada) | C_2 in Peculiar DQ White Dwarfs | ApJ in press. 8 pages emulateapj style, 1 figure | Astrophysical Journal 678, 1292-1297 (2008) | 10.1086/586889 | null | astro-ph | null | White dwarfs (WDs) with carbon absorption features in their optical spectra
are known as DQ WDs. The subclass of peculiar DQ WDs are cool objects
(T_eff<6000 K) which show molecular absorption bands that have centroid
wavelengths ~100-300 Angstroms shortward of the bandheads of the C_2 Swan
bands. These "peculiar DQ bands" have been attributed to a hydrocarbon such as
C_2H. We point out that C_2H does not show strong absorption bands with
wavelengths matching those of the peculiar DQ bands and neither does any other
simple molecule or ion likely to be present in a cool WD atmosphere. The most
straightforward explanation for the peculiar DQ bands is that they are
pressure-shifted Swan bands of C_2. While current models of WD atmospheres
suggest that, in general, peculiar DQ WDs do not have higher photospheric
pressures than normal DQ WDs do, that finding requires confirmation by improved
models of WD atmospheres and of the behavior of C_2 at high pressures and
temperatures. If it is eventually shown that the peculiar DQ bands cannot be
explained as pressure-shifted Swan bands, the only explanation remaining would
seem to be that they arise from highly rotationally excited C_2 (J_peak>45). In
either case, the absorption band profiles can in principle be used to constrain
the pressure and the rotational temperature of C_2 in the line-forming regions
of normal and peculiar DQ WD atmospheres, which will be useful for comparison
with models. Finally, we note that progress in understanding magnetic DQ WDs
may require models which simultaneously consider magnetic fields, high
pressures and rotational excitation of C_2.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 00:06:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hall",
"Patrick B.",
""
],
[
"Maxwell",
"Aaron J.",
""
]
] | [
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] |
801.4587 | Radu Pantilie | S. Ianus, S. Marchiafava, L. Ornea, R. Pantilie | Twistorial maps between quaternionic manifolds | Minor improvements and two references added for Definition 2.7 and
Proposition 2.8 | null | 10.2991/jnmp.2008.15.1.1 | null | math.DG | null | We introduce a natural notion of quaternionic map between almost quaternionic
manifolds and we prove the following, for maps of rank at least one: 1) A map
between quaternionic manifolds endowed with the integrable almost twistorial
structures is twistorial if and only if it is quaternionic. 2) A map between
quaternionic manifolds endowed with the nonintegrable almost twistorial
structures is twistorial if and only if it is quaternionic and
totally-geodesic. As an application, we describe the quaternionic maps between
open sets of quaternionic projective spaces.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 17:07:51 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Apr 2008 16:15:53 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ianus",
"S.",
""
],
[
"Marchiafava",
"S.",
""
],
[
"Ornea",
"L.",
""
],
[
"Pantilie",
"R.",
""
]
] | [
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] |
801.4588 | Ping Zhang | Zhigang Wang, Ping Zhang | Edge states and the integer quantum Hall effect of spin-chiral
ferromagnetic kagome lattice with a general spin coupling | 6 pages, 6 figures | null | null | null | cond-mat.mes-hall cond-mat.str-el | null | The chiral edge states and the quantized Hall conductance (QHC) in the
two-dimensional kagom\'{e} lattice with spin anisotropies included in a general
Hund's coupling region are studied. This kagom\'{e} lattice system is periodic
in the $x$ direction but has two edges in the $y$ direction. Numerical results
show that the strength of the Hund's coupling, as well as the spin chirality,
affects the edge states and the corresponding QHC. Within the topological edge
theory, we give the expression of the QHC with the winding number of the chiral
edge states on the Riemman surface. This expression is also compaired with that
within the topological bulk theory and they are found to keep consistent with
each other.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 00:16:25 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Wang",
"Zhigang",
""
],
[
"Zhang",
"Ping",
""
]
] | [
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] |
801.4589 | Michal Patrick Decowski | The KamLAND Collaboration | Precision Measurement of Neutrino Oscillation Parameters with KamLAND | Version as published in PRL. Revised Fig. 2 (allowed contours) due to
an error in the figure generating code (numbers or conclusions did not
change). The full dChi2-map for this analysis is available at
http://www.awa.tohoku.ac.jp/KamLAND/chi2map_3rdresult/chi2map.html . Fig. 3
(low E spectrum) was dropped due to space limitations | Phys.Rev.Lett.100:221803,2008 | 10.1103/PhysRevLett.100.221803 | null | hep-ex nucl-ex physics.geo-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The KamLAND experiment has determined a precise value for the neutrino
oscillation parameter $\Delta m^{2}_{21}$ and stringent constraints on
$\theta_{12}$. The exposure to nuclear reactor anti-neutrinos is increased
almost fourfold over previous results to 2.44$\times10^{32}$ proton-yr due to
longer livetime and an enlarged fiducial volume. An undistorted reactor
$\bar{\nu}_{e}$ energy spectrum is now rejected at >5$\sigma$. Extending the
analysis down to the inverse beta decay energy threshold, and incorporating
geo-neutrinos, gives a best-fit at $\Delta m^{2}_{21}$=
$7.58^{+0.14}_{-0.13}(stat)^{+0.15}_{-0.15}(syst)\times10^{-5}$ eV$^{2}$ and
$\tan^2 \theta_{12}$=$0.56^{+0.10}_{0.07}(stat)^{+0.10}_{-0.06}(syst)$. Local
$\Delta \chi^2$-minima at higher and lower $\Delta m^{2}_{21}$ are disfavored
at >4$\sigma$. Combining with solar neutrino data, we obtain $\Delta
m^{2}_{21}$= $7.59^{+0.21}_{-0.21}\times10^{-5}$ eV$^{2}$ and $\tan^2
\theta_{12}$=$0.47^{+0.06}_{-0.05}$.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 00:20:46 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 22:08:59 GMT"
},
{
"version": "v3",
"created": "Wed, 25 Jun 2008 12:24:14 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"The KamLAND Collaboration",
"",
""
]
] | [
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] |
801.459 | Paul Norbury | Paul Norbury | Counting lattice points in the moduli space of curves | 15 pages, 5figures | null | null | null | math.AG math.GT | null | We show how to define and count lattice points in the moduli space
$\modm_{g,n}$ of genus g curves with n labeled points. This produces a
polynomial with coefficients that include the Euler characteristic of the
moduli space, and tautological intersection numbers on the compactified moduli
space.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 01:39:02 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Norbury",
"Paul",
""
]
] | [
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801.4591 | Rod Aros Mr. | Rodrigo Aros | de Sitter Thermodynamics: A glimpse into non equilibrium | null | Phys.Rev.D77:104013,2008 | 10.1103/PhysRevD.77.104013 | null | gr-qc | null | In this article is shown that the thermodynamical evolution of a
Schwarzschild de Sitter space is the evaporation of its black hole. The result
is extended in higher dimensions to Lovelock theories of gravity with a single
positive cosmological constant.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 01:59:36 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 01:11:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aros",
"Rodrigo",
""
]
] | [
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] |
801.4592 | Yue Wang | Yue Wang, John C. S. Lui, Dah-Ming Chiu | Understanding the Paradoxical Effects of Power Control on the Capacity
of Wireless Networks | I refined the previous version in many places, including the title.
to appear in IEEE Transactions on Wireless Communications | null | 10.1109/T-WC.2009.080142 | null | cs.NI cs.PF | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent works show conflicting results: network capacity may increase or
decrease with higher transmission power under different scenarios. In this
work, we want to understand this paradox. Specifically, we address the
following questions: (1)Theoretically, should we increase or decrease
transmission power to maximize network capacity? (2) Theoretically, how much
network capacity gain can we achieve by power control? (3) Under realistic
situations, how do power control, link scheduling and routing interact with
each other? Under which scenarios can we expect a large capacity gain by using
higher transmission power? To answer these questions, firstly, we prove that
the optimal network capacity is a non-decreasing function of transmission
power. Secondly, we prove that the optimal network capacity can be increased
unlimitedly by higher transmission power in some network configurations.
However, when nodes are distributed uniformly, the gain of optimal network
capacity by higher transmission power is upper-bounded by a positive constant.
Thirdly, we discuss why network capacity in practice may increase or decrease
with higher transmission power under different scenarios using carrier sensing
and the minimum hop-count routing. Extensive simulations are carried out to
verify our analysis.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 02:51:11 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Sep 2008 04:03:33 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Wang",
"Yue",
""
],
[
"Lui",
"John C. S.",
""
],
[
"Chiu",
"Dah-Ming",
""
]
] | [
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] |
801.4593 | Thi Anh Thu Dinh | Thi-Anh-Thu Dinh | Characteristic varieties for a class of line arrangements | 12 pages, 1 figure | null | null | null | math.GT | null | Let $\mathcal{A}$ be a line arrangement in the complex projective plane
$\mathbb{P}^2$, having the points of multiplicity $\geq 3$ situated on two
lines in $\mathcal{A}$, say $H_0$ and $H_{\infty}$. Then we show that the
non-local irreducible components of the first resonance variety
$\mathcal{R}_1(\mathcal{A})$ are 2-dimensional and correspond to parallelograms
$\mathcal{P}$ in $\mathbb{C}^2=\mathbb{P}^2 \setminus H_{\infty}$ whose sides
are in $\mathcal{A}$ and for which $H_0$ is a diagonal.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 02:37:02 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 22:42:22 GMT"
}
] | 2008-02-29T00:00:00 | [
[
"Dinh",
"Thi-Anh-Thu",
""
]
] | [
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] |
801.4594 | Justin F. Vazquez-Poritz | Philip C. Argyres, Mohammad Edalati, Justin F. Vazquez-Poritz | Lightlike Wilson loops from AdS/CFT | 32 pages, 6 figures | JHEP 0803:071,2008 | 10.1088/1126-6708/2008/03/071 | null | hep-th hep-ph nucl-th | null | We investigate the lightlike limit of stationary spacelike string
configurations on a large class of five-dimensional asymptotically AdS
backgrounds. Specific examples include gravity duals which incorporate finite
't Hooft coupling, curvature-squared corrections, and chemical potentials. A
universal feature of these AdS/CFT models is that the string solution with
minimum action yields a lightlike Wilson loop whose leading behavior is
exponentially linear, rather than quadratic, in the width of the loop. Unless
there is a compelling reason for discarding the leading saddlepoint
contribution to the Wilson loop, following the proposal of Liu et. al. [2]
leads to zero jet-quenching parameter for all of these models.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 19:22:44 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Argyres",
"Philip C.",
""
],
[
"Edalati",
"Mohammad",
""
],
[
"Vazquez-Poritz",
"Justin F.",
""
]
] | [
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] |
801.4595 | Zhenhua Ni | Yingying Wang, Zhenhua Ni, Zexiang Shen, Haomin Wang, and Yihong Wu | Interference enhancement of Raman signal of graphene | 13 pages, 3 figures to be published in Applied Physics Letters | Applied Physics Letters 92, 043121 2008 | 10.1063/1.2838745 | null | cond-mat.mtrl-sci | null | Raman spectroscopic studies of graphene have attracted much interest. The
G-band Raman intensity of a single layer graphene on Si substrate with 300 nm
SiO2 capping layer is surprisingly strong and is comparable to that of bulk
graphite. To explain this Raman intensity anomaly, we show that in addition to
the interference due to multiple reflection of the incident laser, the multiple
reflection of the Raman signal inside the graphene layer must be also accounted
for. Further studies of the role of SiO2 layer in the enhancement Raman signal
of graphene are carried out and an enhancement factor of ~30 is achievable,
which is very significant for the Raman studies. Finally, we discuss the
potential application of this enhancement effect on other ultra-thin films and
nanoflakes and a general selection criterion of capping layer and substrate is
given.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 03:44:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Yingying",
""
],
[
"Ni",
"Zhenhua",
""
],
[
"Shen",
"Zexiang",
""
],
[
"Wang",
"Haomin",
""
],
[
"Wu",
"Yihong",
""
]
] | [
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] |
801.4596 | G. Christopher Hruska | G. Christopher Hruska (University of Wisconsin--Milwaukee) | Relative hyperbolicity and relative quasiconvexity for countable groups | 44 pages, 2 figures. Version 3 addresses some minor concerns of the
referee regarding the exposition. To appear in AGT | Algebr. Geom. Topol. 10 (2010) 1807-1856 | 10.2140/agt.2010.10.1807 | null | math.GR math.MG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We lay the foundations for the study of relatively quasiconvex subgroups of
relatively hyperbolic groups. These foundations require that we first work out
a coherent theory of countable relatively hyperbolic groups (not necessarily
finitely generated). We prove the equivalence of Gromov, Osin, and Bowditch's
definitions of relative hyperbolicity for countable groups.
We then give several equivalent definitions of relatively quasiconvex
subgroups in terms of various natural geometries on a relatively hyperbolic
group. We show that each relatively quasiconvex subgroup is itself relatively
hyperbolic, and that the intersection of two relatively quasiconvex subgroups
is again relatively quasiconvex. In the finitely generated case, we prove that
every undistorted subgroup is relatively quasiconvex, and we compute the
distortion of a finitely generated relatively quasiconvex subgroup.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 05:40:13 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 21:18:23 GMT"
},
{
"version": "v3",
"created": "Thu, 1 Jul 2010 00:39:19 GMT"
}
] | 2016-01-20T00:00:00 | [
[
"Hruska",
"G. Christopher",
"",
"University of Wisconsin--Milwaukee"
]
] | [
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] |
801.4597 | Katsunori Kawamura | Katsunori Kawamura | C$^{*}$-bialgebra defined by the direct sum of Cuntz-Krieger algebras | 17 pages | null | null | null | math.OA math.QA | null | Let ${\sf CK}_{*}$ denote the C$^{*}$-algebra defined by the direct sum of
all Cuntz-Krieger algebras. We introduce a comultiplication $\Delta_{\phi}$ and
a counit $\epsilon$ on ${\sf CK}_{*}$ such that $\Delta_{\phi}$ is a
nondegenerate $*$-homomorphism from ${\sf CK}_{*}$ to ${\sf CK}_{*}\otimes {\sf
CK}_{*}$ and $\epsilon$ is a $*$-homomorphism from ${\sf CK}_{*}$ to ${\bf C}$.
From this, ${\sf CK}_{*}$ is a counital non-commutative non-cocommutative
C$^{*}$-bialgebra. Furthermore, C$^{*}$-bialgebra automorphisms, a tensor
product of representations and C$^{*}$-subbialgebras of ${\sf CK}_{*}$ are
investigated.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 04:20:50 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Apr 2008 06:05:11 GMT"
}
] | 2008-04-10T00:00:00 | [
[
"Kawamura",
"Katsunori",
""
]
] | [
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] |
801.4598 | Guohua Zhu | M. A. Noginov, G. Zhu, M. F. Mayy, B. A. Ritzo, N. Noginova, and V. A.
Podolskiy | Stimulated emission of surface plasmon polaritons | 8 pages; 3 figures | null | 10.1103/PhysRevLett.101.226806 | null | physics.optics | null | We have observed laser-like emission of surface plasmon polaritons (SPPs)
decoupled to the glass prism in an attenuated total reflection setup. SPPs were
excited by optically pumped molecules in a polymeric film deposited on the top
of the silver film. Stimulated emission was characterized by a distinct
threshold in the input-output dependence and narrowing of the emission
spectrum. The observed stimulated emission and corresponding to it compensation
of the metallic absorption loss by gain enables many applications of
metamaterials and nanoplasmonic devices.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 04:21:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Noginov",
"M. A.",
""
],
[
"Zhu",
"G.",
""
],
[
"Mayy",
"M. F.",
""
],
[
"Ritzo",
"B. A.",
""
],
[
"Noginova",
"N.",
""
],
[
"Podolskiy",
"V. A.",
""
]
] | [
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] |
801.4599 | Mesfin Asfaw | Mesfin Asfaw | Modeling an efficient Brownian heat engine | 8 pages and 14 figures | null | 10.1140/epjb/e2008-00308-5 | null | cond-mat.stat-mech cond-mat.other | null | We discuss the effect of subdividing the ratchet potential on the performance
of a tiny Brownian heat engine that is modeled as a Brownian particle hopping
in a viscous medium in a sawtooth potential (with or without load) assisted by
alternately placed hot and cold heat baths along its path. We show that the
velocity, the efficiency and the coefficient of performance of the refrigerator
maximize when the sawtooth potential is subdivided into series of smaller
connected barrier series. When the engine operates quasistatically, we
analytically show that the efficiency of the engine can not approach the Carnot
efficiency and, the coefficient of performance of the refrigerator is always
less than the Carnot refrigerator due to the irreversible heat flow via the
kinetic energy.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 04:29:49 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Apr 2008 01:55:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Asfaw",
"Mesfin",
""
]
] | [
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] |
801.46 | Gary Weisel Dr. | R.T. Braun, W. Tornow, C.R. Howell, D.E. Gonzalez Trotter, C.D. Roper,
F. Salinas, H.R. Setze, R.L. Walter, and G.J. Weisel | Neutron-proton analyzing power at 12 MeV and inconsistencies in
parametrizations of nucleon-nucleon data | Six pages, four figures, one table, to be published in Physics
Letters B | Phys.Lett.B660:161-166,2008 | 10.1016/j.physletb.2007.12.039 | null | nucl-ex | null | We present the most accurate and complete data set for the analyzing power
Ay(theta) in neutron-proton scattering. The experimental data were corrected
for the effects of multiple scattering, both in the center detector and in the
neutron detectors. The final data at En = 12.0 MeV deviate considerably from
the predictions of nucleon-nucleon phase-shift analyses and potential models.
The impact of the new data on the value of the charged pion-nucleon coupling
constant is discussed in a model study.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 04:55:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Braun",
"R. T.",
""
],
[
"Tornow",
"W.",
""
],
[
"Howell",
"C. R.",
""
],
[
"Trotter",
"D. E. Gonzalez",
""
],
[
"Roper",
"C. D.",
""
],
[
"Salinas",
"F.",
""
],
[
"Setze",
"H. R.",
""
],
[
"Walter",
"R. L.",
""
],
[
"Weisel",
"G. J.",
""
]
] | [
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] |
801.4601 | Roberto V\'azquez | R. V\'azquez, L. F. Miranda, L. Olgu\'in, S. Ayala, J. M. Torrelles,
M. E. Contreras, P. F. Guill\'en | The physical structure of the point-symmetric and quadrupolar planetary
nebula NGC 6309 | To be published in Astronomy & Astrophysics; 11 pages, 8 figures, 4
tables | null | 10.1051/0004-6361:20078520 | null | astro-ph | null | We analyse the point-symmetric planetary nebula NGC 6309 in terms of its
three-dimensional structure and of internal variations of the physical
conditions to deduce the physical processes involved in its formation. We used
VLA-D 3.6-cm continuum, ground-based, and HST-archive imaging as well as long
slit high- and low-dispersion spectroscopy. The low-dispersion spectra indicate
a high excitation nebula, with low to medium variations of its internal
physical conditions. In the optical images, the point-symmetric knots show a
lack of [NII] emission as compared with similar features previously known in
other PNe. A rich internal structure of the central region is seen in the HST
images, resembling a deformed torus. Long slit high-dispersion spectra reveal a
complex kinematics in the central region. The spectral line profiles from the
external regions of NGC 6309 indicate expanding lobes (~40 km/s) as those
generally found in bipolar nebulae. Finally, we have found evidence for the
presence of a faint halo, possibly related to the envelope of the AGB-star
progenitor. Our data indicate that NGC 6309 is a quadrupolar nebula with two
pairs of bipolar lobes whose axes are oriented PA=40 and PA=76. Equatorial and
polar velocities for these two pairs of lobes are 29 and 86 km/s for the
bipolar system at PA=40 and 25 and 75 km/s for the bipolar system at PA=76.
There is also a central torus that is expanding at 25 km/s. Kinematical age for
all these structures is around 3700 to 4000 yr. We conclude that NGC 6309 was
formed by a set of well-collimated bipolar outflows (jets), which were ejected
in the initial stages of its formation as a planetary nebula. These jets carved
the bipolar lobes in the previous AGB wind and their remnants are now observed
as the point-symmetric knots tracing the edges of the lobes.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 04:58:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Vázquez",
"R.",
""
],
[
"Miranda",
"L. F.",
""
],
[
"Olguín",
"L.",
""
],
[
"Ayala",
"S.",
""
],
[
"Torrelles",
"J. M.",
""
],
[
"Contreras",
"M. E.",
""
],
[
"Guillén",
"P. F.",
""
]
] | [
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] |
801.4602 | Simon Trebst | Simon Trebst, Eddy Ardonne, Adrian Feiguin, David A. Huse, Andreas W.
W. Ludwig, Matthias Troyer | Collective states of interacting Fibonacci anyons | 5 pages, 5 figures | Phys. Rev. Lett. 101, 050401 (2008). | 10.1103/PhysRevLett.101.050401 | NORDITA-2008-4 | cond-mat.stat-mech cond-mat.mes-hall | null | We show that chains of interacting Fibonacci anyons can support a wide
variety of collective ground states ranging from extended critical, gapless
phases to gapped phases with ground-state degeneracy and quasiparticle
excitations. In particular, we generalize the Majumdar-Ghosh Hamiltonian to
anyonic degrees of freedom by extending recently studied pairwise anyonic
interactions to three-anyon exchanges. The energetic competition between two-
and three-anyon interactions leads to a rich phase diagram that harbors
multiple critical and gapped phases. For the critical phases and their higher
symmetry endpoints we numerically establish descriptions in terms of
two-dimensional conformal field theories. A topological symmetry protects the
critical phases and determines the nature of gapped phases.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 05:05:52 GMT"
}
] | 2008-07-30T00:00:00 | [
[
"Trebst",
"Simon",
""
],
[
"Ardonne",
"Eddy",
""
],
[
"Feiguin",
"Adrian",
""
],
[
"Huse",
"David A.",
""
],
[
"Ludwig",
"Andreas W. W.",
""
],
[
"Troyer",
"Matthias",
""
]
] | [
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] |
801.4603 | Hua-Xing Chen | Hua-Xing Chen, Xiang Liu, Atsushi Hosaka, and Shi-Lin Zhu | The Y(2175) State in the QCD Sum Rule | 10 pages, 6 figures, revised version to appear in Phys. Rev. D | Phys.Rev.D78:034012,2008 | 10.1103/PhysRevD.78.034012 | null | hep-ph | http://creativecommons.org/licenses/publicdomain/ | We study the mass of the state Y(2175) of J^{PC} = 1^{--} in the QCD sum
rule. We construct both the diquark-antidiquark currents (ss)(s_bar s_bar) and
the meson-meson currents (s_bar s)(s_bar s). We find that there are two
independent currents for both cases, and derive the relations between them. The
OPE convergence of these two currents is sufficiently fast, which enables us to
perform good sum rule analysis. Both the SVZ sum rule and the finite energy sum
rule lead to a mass around 2.3+-0.4 GeV, which is consistent with the observed
mass within the uncertainties of the present QCD sum rule. The coupling of the
four-quark currents to lower lying states such as \phi(1020) turns out to be
rather small. We also discuss possible decay properties of Y(2175) if it is a
tetraquark state.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 05:18:21 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jul 2008 04:10:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Liu",
"Xiang",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | [
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] |
801.4604 | Xiang-Bin Wang | X.-B. Wang, T. Hiroshima, A. Tomita, and M. Hayashi | Quantum information with Gaussian states | 170 pages. Minors of the published version are corrected and listed
in the Acknowledgement part of this version | Physics Reports, 448, 1(2007) | 10.1016/j.physrep.2007.04.005 | null | quant-ph | null | Quantum optical Gaussian states are a type of important robust quantum states
which are manipulatable by the existing technologies. So far, most of the
important quantum information experiments are done with such states, including
bright Gaussian light and weak Gaussian light. Extending the existing results
of quantum information with discrete quantum states to the case of continuous
variable quantum states is an interesting theoretical job. The quantum Gaussian
states play a central role in such a case. We review the properties and
applications of Gaussian states in quantum information with emphasis on the
fundamental concepts, the calculation techniques and the effects of
imperfections of the real-life experimental setups.
Topics here include the elementary properties of Gaussian states and relevant
quantum information device, entanglement-based quantum tasks such as quantum
teleportation, quantum cryptography with weak and strong Gaussian states and
the quantum channel capacity, mathematical theory of quantum entanglement and
state estimation for Gaussian states.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 06:54:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"X. -B.",
""
],
[
"Hiroshima",
"T.",
""
],
[
"Tomita",
"A.",
""
],
[
"Hayashi",
"M.",
""
]
] | [
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] |
801.4605 | Alan L. Carey | A. L. Carey, J. Phillips, A. Rennie | Twisted cyclic theory and an index theory for the gauge invariant KMS
state on Cuntz algebras | 27 pages, minor corrections | null | null | null | math.KT math.OA | null | This paper presents, by example, an index theory appropriate to algebras
without trace. Whilst we work exclusively with the Cuntz algebras the
exposition is designed to indicate how to develop a general theory. Our main
result is an index theorem (formulated in terms of spectral flow) using a
twisted cyclic cocycle where the twisting comes from the modular automorphism
group for the canonical gauge action on the Cuntz algebra. We introduce a
modified $K_1$-group of the Cuntz algebra so as to pair with this twisted
cocycle. As a corollary we obtain a noncommutative geometry interpretation for
Araki's notion of relative entropy in this example. We also note the connection
of this example to the theory of noncommutative manifolds.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 05:47:03 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Feb 2008 05:43:13 GMT"
}
] | 2008-02-29T00:00:00 | [
[
"Carey",
"A. L.",
""
],
[
"Phillips",
"J.",
""
],
[
"Rennie",
"A.",
""
]
] | [
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] |
801.4606 | Seokcheon Lee | Seokcheon Lee | Palatini f(R) Cosmology | 10 pages, CosPA 2007 Proceeding will be published in the Mod. Phys.
Lett. A | Mod.Phys.Lett.A23:1388-1396,2008 | 10.1142/S021773230802776X | null | gr-qc astro-ph | null | We investigate the modified gravity theories in terms of the effective dark
energy models. We compare the cosmic expansion history and the linear growth in
different models. We also study the evolution of linear cosmological
perturbations in modified theories of gravity assuming the Palatini formalism.
We find the stability of the superhorizon metric evolution depends on models.
We also study the matter density fluctuation in the general gauge and show the
differential equations in super and sub-horizon scales.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 05:48:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lee",
"Seokcheon",
""
]
] | [
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] |
801.4607 | Frances Kirwan | Frances Kirwan | Quotients by non-reductive algebraic group actions | Minor corrections made on pages 12 and 20; references updated. To
appear in 'Moduli Spaces and Vector Bundles' (CUP) in honour of Peter
Newstead | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a suitable action on a complex projective variety X of a non-reductive
affine algebraic group H, this paper considers how to choose a reductive group
G containing H and a projective completion of G x_H X which is a reductive
envelope in the sense of math.AG/0703131. In particular it studies the family
of examples given by moduli spaces of hypersurfaces in the weighted projective
plane P(1,1,2) obtained as quotients by linear actions of the (non-reductive)
automorphism group of P(1,1,2).
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:49:21 GMT"
},
{
"version": "v2",
"created": "Mon, 31 Mar 2008 14:29:23 GMT"
},
{
"version": "v3",
"created": "Mon, 7 Apr 2008 11:55:52 GMT"
},
{
"version": "v4",
"created": "Mon, 15 Dec 2008 12:41:18 GMT"
}
] | 2008-12-15T00:00:00 | [
[
"Kirwan",
"Frances",
""
]
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801.4608 | G. S. Asanov | G.S. Asanov | Finsleroid-regular space. Landsberg-to-Berwald implication | null | null | null | null | math.DG | null | By performing required evaluations, we show that in the Finsleroid-regular
space the Landsberg-space condition just degenerates to the Berwald-space
condition (at any dimension number $N\ge2$). Simple and clear expository
representations are obtained. Due comparisons with the Finsleroid-Finsler space
are indicated.
Keywords: Finsler metrics, spray coefficients, curvature tensors.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 06:31:50 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Asanov",
"G. S.",
""
]
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801.4609 | Michel Gros | Michel Gros (IRMAR) | Un scindage de l'application de Frobenius sur toute l'alg\`ebre des
distributions de SL_2 | null | null | null | null | math.AG | null | We study a splitting of the Frobenius map on the whole algebra of
distributions of SL_2 (over a finite field) and its relation with the explicit
Frobenius descent on arithmetic D-modules over the projective line
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 07:01:59 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Gros",
"Michel",
"",
"IRMAR"
]
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] |
801.461 | Karim Lounici | Karim Lounici | Sup-norm convergence rate and sign concentration property of Lasso and
Dantzig estimators | Published in at http://dx.doi.org/10.1214/08-EJS177 the Electronic
Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Electronic Journal of Statistics 2008, Vol. 2, 90-102 | 10.1214/08-EJS177 | IMS-EJS-EJS_2008_177 | math.ST stat.TH | null | We derive the $l_{\infty}$ convergence rate simultaneously for Lasso and
Dantzig estimators in a high-dimensional linear regression model under a mutual
coherence assumption on the Gram matrix of the design and two different
assumptions on the noise: Gaussian noise and general noise with finite
variance. Then we prove that simultaneously the thresholded Lasso and Dantzig
estimators with a proper choice of the threshold enjoy a sign concentration
property provided that the non-zero components of the target vector are not too
small.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 07:22:24 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 11:02:15 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Lounici",
"Karim",
""
]
] | [
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] |
801.4611 | Asle Sudbo | Kjetil Borkje and Asle Sudbo | Effective theory of fluctuating circulating currents in high-Tc cuprates | 5 pages, 1 figure, 16 references. To be published in Physical Review
B | Phys. Rev. B 77, 092404 (2008) | 10.1103/PhysRevB.77.092404 | null | cond-mat.str-el | null | We derive an effective dissipative quantum field theory for fluctuating
orbital currents in clean $CuO_2$ sheets of high-$T_c$ cuprates, based on a
three-band model. The Coulomb repulsion term between $Cu$- and $O$-sites is
decoupled in terms of current operators representing horizontal and vertical
parts of circulating currents within each $CuO_2$ unit cell of the lattice. The
model has ordering of currents at finite temperatures. The dissipative kernel
in the model is of the form $|\omega|/|{\bf q}|$, indicating Landau damping.
Applications of the effective theory to other models are also discussed.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:00:02 GMT"
}
] | 2008-03-13T00:00:00 | [
[
"Borkje",
"Kjetil",
""
],
[
"Sudbo",
"Asle",
""
]
] | [
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] |
801.4612 | Natasza Siodmiak | N. Siodmiak, M. Meixner, T. Ueta, B.E.K. Sugerman, G.C. Van de Steene,
R. Szczerba | HST Snapshot Survey of Post-AGB Objects | 21 pages, 11 figures | null | 10.1086/529115 | null | astro-ph | null | The results from a Hubble Space Telescope (HST) snapshot survey of post-AGB
objects are shown. The aim of the survey is to complement existing HST images
of PPN and to connect various types of nebulosities with physical and chemical
properties of their central stars. Nebulosities are detected in 15 of 33
sources. Images and photometric and geometric measurements are presented. For
sources with nebulosities we see a morphological bifurcation into two groups,
DUPLEX and SOLE, as previous studies have found. We find further support to the
previous results suggesting that this dichotomy is caused by a difference in
optical thickness of the dust shell. The remaining 18 sources are classified as
stellar post-AGB objects, because our observations indicate a lack of
nebulosity. We show that some stellar sources may in fact be DUPLEX or SOLE
based on their infrared colors. The cause of the differences among the groups
are investigated. We discuss some evidence suggesting that high progenitor-mass
AGB stars tend to become DUPLEX post-AGB objects. Intermediate progenitor-mass
AGB stars tend to be SOLE post-AGB objects. Most of the stellar sources
probably have low mass progenitors and do not seem to develop nebulosities
during the post-AGB phase and therefore do not become planetary nebulae.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:01:14 GMT"
}
] | 2016-12-11T00:00:00 | [
[
"Siodmiak",
"N.",
""
],
[
"Meixner",
"M.",
""
],
[
"Ueta",
"T.",
""
],
[
"Sugerman",
"B. E. K.",
""
],
[
"Van de Steene",
"G. C.",
""
],
[
"Szczerba",
"R.",
""
]
] | [
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] |
801.4613 | Norita Kawanaka | Norita Kawanaka, Yoshiaki Kato and Shin Mineshige | X-ray Emissions from Three-dimensional Magnetohydrodynamic Coronal
Accretion Flows | accepted to Publications of the Astronomical Society of Japan | null | 10.1093/pasj/60.2.399 | null | astro-ph | null | We calculate the radiation spectrum and its time variability of the black
hole accretion disk-corona system based on the three-dimensional
magnetohydrodynamic simulation. In explaining the spectral properties of active
galactic nuclei (AGNs), it is often assumed that they consist of a
geometrically thin, optically thick disk and hot, optically thin corona
surrounding the thin disk. As for a model of the corona, we adopt the
simulation data of three-dimensional, non-radiative MHD accretion flows
calculated by Kato and coworkers, while for a thin disk we assume a standard
type disk. We perform Monte Carlo radiative transfer simulations in the corona,
taking into account the Compton scattering of soft photons from the thin disk
by hot thermal electrons and coronal irradiation heating of the thin disk,
which emits blackbody radiation. By adjusting the density parameter of the MHD
coronal flow, we can produce the emergent spectra which are consistent with
those of typical Seyfert galaxies. Moreover, we find rapid time variability in
X-ray emission spectra, originating from the density fluctuation produced by
the magnetorotational instability in the MHD corona. The features of reflection
component including iron fluorescent line emission are also briefly discussed.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:01:36 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kawanaka",
"Norita",
""
],
[
"Kato",
"Yoshiaki",
""
],
[
"Mineshige",
"Shin",
""
]
] | [
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] |
801.4614 | Everett W. Howe | Daniel Goldstein, Robert M. Guralnick, Everett W. Howe, Michael E.
Zieve | Nonisomorphic curves that become isomorphic over extensions of coprime
degrees | LaTeX, 32 pages. Further references added to the discussion in
Section 10 | J. Algebra 320 (2008) 2526-2558 | null | null | math.AG | null | We show that one can find two nonisomorphic curves over a field K that become
isomorphic to one another over two finite extensions of K whose degrees over K
are coprime to one another.
More specifically, let K_0 be an arbitrary prime field and let r and s be
integers greater than 1 that are coprime to one another. We show that one can
find a finite extension K of K_0, a degree-r extension L of K, a degree-s
extension M of K, and two curves C and D over K such that C and D become
isomorphic to one another over L and over M, but not over any proper
subextensions of L/K or M/K.
We show that such C and D can never have genus 0, and that if K is finite, C
and D can have genus 1 if and only if {r,s} = {2,3} and K is an odd-degree
extension of F_3. On the other hand, when {r,s}={2,3} we show that genus-2
examples occur in every characteristic other than 3.
Our detailed analysis of the case {r,s} = {2,3} shows that over every finite
field K there exist nonisomorphic curves C and D that become isomorphic to one
another over the quadratic and cubic extensions of K.
Most of our proofs rely on Galois cohomology. Without using Galois
cohomology, we show that two nonisomorphic genus-0 curves over an arbitrary
field remain nonisomorphic over every odd-degree extension of the base field.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 20:47:13 GMT"
},
{
"version": "v2",
"created": "Mon, 19 May 2008 19:28:44 GMT"
}
] | 2010-01-23T00:00:00 | [
[
"Goldstein",
"Daniel",
""
],
[
"Guralnick",
"Robert M.",
""
],
[
"Howe",
"Everett W.",
""
],
[
"Zieve",
"Michael E.",
""
]
] | [
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] |
801.4615 | Hongbo Cheng | Yunqi Liu, Hongbo Cheng | The circular loop equation of a cosmic string with time-varying tension
in de Sitter spacetimes | 6 pages | Int.J.Theor.Phys.48:1070-1075,2009 | 10.1007/s10773-008-9879-7 | null | hep-th | null | In this work the equation of circular loops of cosmic string possessing
time-dependent tension is studied in the de Sitter spacetime. We find that the
cosmic string loops with initial radius $r(t_{0})>0.707L$, L de Sitter radius,
should not collapse to form a black holes. It is also found that in the case of
$r(t_{0})<0.707L$ a loop of cosmic string whose tension depends on some power
of cosmic time can not become a black hole if the power is lower than a
critical value which is associated with the initial size of the loop.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:20:38 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Mar 2008 06:28:41 GMT"
}
] | 2009-03-24T00:00:00 | [
[
"Liu",
"Yunqi",
""
],
[
"Cheng",
"Hongbo",
""
]
] | [
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] |
801.4616 | Fabien Durand | Maria Isabel Cortez, Fabien Durand (LAMFA), Bernard Host (LAMA),
Alejandro Maass (CMM) | Continuous and measurable eigenfunctions of linearly recurrent dynamical
Cantor systems | null | Journal of the London Mathematical Society 67, 3 (2003) 790-804 | null | null | math.DS | null | The class of linearly recurrent Cantor systems contains the substitution
subshifts and some odometers. For substitution subshifts and odometers
measure--theoretical and continuous eigenvalues are the same. It is natural to
ask whether this rigidity property remains true for the class of linearly
recurrent Cantor systems. We give partial answers to this question.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:21:02 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Cortez",
"Maria Isabel",
"",
"LAMFA"
],
[
"Durand",
"Fabien",
"",
"LAMFA"
],
[
"Host",
"Bernard",
"",
"LAMA"
],
[
"Maass",
"Alejandro",
"",
"CMM"
]
] | [
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] |
801.4617 | Mang Feng | Z. Y. Xu, M. Feng, W. M. Zhang | Universal quantum computation with quantum-dot cellular automata in
dephasing-free subspace | 10 pages, 3 figures | Quantum Information & Computation, Vol.8, No.10 (2008) 0977-0986 | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility to have electron-pairs in dephasing-free
subspace (DFS), by means of the quantum-dot cellular automata (QCA) and
single-spin rotations, to carry out a high-fidelity and deterministic universal
quantum computation. We show that our QCA device with electrons tunneling two
dimensionally is very suitable for DFS encoding, and argue that our design
favors a scalable quantum computation robust to collective dephasing errors.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:23:56 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Aug 2008 03:02:29 GMT"
}
] | 2010-06-25T00:00:00 | [
[
"Xu",
"Z. Y.",
""
],
[
"Feng",
"M.",
""
],
[
"Zhang",
"W. M.",
""
]
] | [
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] |
801.4618 | Matt Jarvis | Matt J.Jarvis | Multi-wavelength surveys towards the SKA pathfinders | 5 pages, 1 Figure. To Appear in The Modern Radio Universe: From
Planets to Dark Energy Conference (Oct 1-5 2007, The University of
Manchester) Editors: Beswick, Diamond & Schilizzi | PoS MRU:057,2007 | null | null | astro-ph | null | In these proceedings I discuss various extragalactic surveys which will be
undertaken over the next few years and which will be complementary to any HI
and/or continuum surveys with the SKA-pathfinder telescopes. I concentrate on
the near-infrared public surveys which will be undertaken with the Visible and
Infrared Survey Telscope for Astronomy (VISTA), and in particular the VISTA
Deep Extragalactic Observations (VIDEO) survey which will provide the ideal
data set to combine with any deep SKA-pathfinder observations of the
extragalactic sky. After highlighting the links that the SKA pathfinders have
with the various VISTA surveys, I briefly describe an approved large area
survey to be carried out with the Herschel Space Observatory which has a large
scientific overlap with the SKA pathfinder telescopes.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:47:33 GMT"
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] | 2009-06-23T00:00:00 | [
[
"Jarvis",
"Matt J.",
""
]
] | [
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801.4619 | Fabien Durand | Xavier Bressaud, Fabien Durand (LAMFA), Alejandro Maass (CMM) | Necessary and sufficient conditions to be an eigenvalue for linearly
recurrent dynamical Cantor systems | 18 pages | Journal of the London Mathematical Society 72, 3 (2005) 799-816 | null | null | math.DS | null | We give necessary and sufficient conditions to have measurable and continuous
eigenfunctions for linearly recurrent Cantor dynamical systems. We also
construct explicitly an example of linearly recurrent system with nontrivial
Kronecker factor and a trivial maximal equicontinuous factor.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:44:50 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Bressaud",
"Xavier",
"",
"LAMFA"
],
[
"Durand",
"Fabien",
"",
"LAMFA"
],
[
"Maass",
"Alejandro",
"",
"CMM"
]
] | [
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] |
801.462 | Julien Vidal | J. Vidal, S. Dusuel, K. P. Schmidt | Comment on "Anyonic braiding in optical lattices" | 1 page | null | null | null | cond-mat.other quant-ph | null | We point out some major technical and conceptual mistakes which invalidate
the conclusion drawn in "Anyonic braiding in optical lattices" by C. Zhang, V.
W. Scarola, S. Tewari, and S. Das Sarma published in PNAS 104, 18415 (2007).
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:47:55 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Vidal",
"J.",
""
],
[
"Dusuel",
"S.",
""
],
[
"Schmidt",
"K. P.",
""
]
] | [
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801.4621 | Marc Arnaudon | Marc Arnaudon (LMA), Jean-Christophe Breton (LMCA), Nicolas Privault | Convex ordering for random vectors using predictable representation | null | null | null | null | math.PR | null | We prove convex ordering results for random vectors admitting a predictable
representation in terms of a Brownian motion and a non-necessarily independent
jump component. Our method uses forward-backward stochastic calculus and
extends previous results in the one-dimensional case. We also study a geometric
interpretation of convex ordering for discrete measures in connection with the
conditions set on the jump heights and intensities of the considered processes.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:51:44 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Arnaudon",
"Marc",
"",
"LMA"
],
[
"Breton",
"Jean-Christophe",
"",
"LMCA"
],
[
"Privault",
"Nicolas",
""
]
] | [
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] |
801.4622 | Giovanni Garberoglio | G. Garberoglio | Boltzmann bias grand canonical Monte Carlo | 12 pages, 6 figures. Accepted for publication in The Journal of
Chemical Physics | J. Chem. Phys. 128, 134109 (2008) | 10.1063/1.2883683 | null | cond-mat.stat-mech physics.comp-ph | null | We derive an efficient method for the insertion of structured particles in
grand canonical Monte Carlo simulations of adsorption in very confining
geometries. We extend this method to path integral simulations and use it to
calculate the isotherm of adsorption of hydrogen isotopes in narrow carbon
nanotubes (2D confinement) and slit pores (1D confinement) at the temperatures
of 20 K and 77 K, discussing its efficiency by comparison to the standard path
integral grand canonical Monte Carlo algorithm. We use this algorithm to
perform multicomponent simulations in order to calculate the hydrogen isotope
selectivity for adsorption in narrow carbon nanotubes and slit pores at finite
pressures. The algorithm described here can be applied to the study of
adsorption of real oligomers and polymers in narrow pores and channels.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 08:55:49 GMT"
}
] | 2008-04-09T00:00:00 | [
[
"Garberoglio",
"G.",
""
]
] | [
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801.4623 | Andrei Pomeransky | I.B. Khriplovich and A.A. Pomeransky, N. Produit, G. Yu. Ruban | Passage of small black hole through the Earth. Is it detectable? | Concise version of arXiv:0710.3438 with technical calculations
omitted; discussion of possible underwater detection added | null | null | null | hep-ex astro-ph physics.geo-ph | null | We examine the energy losses of a small black hole passing through the Earth,
and in particular, the excitations created in the frequency range accessible to
modern acoustic detectors. The dominating contributions to the effect are due
to the coherent sound radiation of the Cherenkov type and to the conversion of
black hole radiation into sound waves.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 09:04:10 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Khriplovich",
"I. B.",
""
],
[
"Pomeransky",
"A. A.",
""
],
[
"Produit",
"N.",
""
],
[
"Ruban",
"G. Yu.",
""
]
] | [
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] |
801.4624 | Kari Astala | Kari Astala, James Gill, Steffen Rohde and Eero Saksman | Optimal regularity for planar mappings of finite distortion | 22 pages, formula (3) has been corrected | null | null | null | math.CV math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $f:\Omega\to\IR^2$ be a mapping of finite distortion, where
$\Omega\subset\IR^2 .$ Assume that the distortion function $K(x,f)$ satisfies
$e^{K(\cdot, f)}\in L^p_{loc}(\Omega)$ for some $p>0.$ We establish optimal
regularity and area distortion estimates for $f$. Especially, we prove that
$|Df|^2 \log^{\beta -1}(e + |Df|) \in L^1_{loc}(\Omega) $ for every $\beta <p.$
This answers positively well known conjectures due to Iwaniec and Martin
\cite{IMbook} and to Iwaniec, Koskela and Martin \cite{IKM}.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 09:19:02 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Feb 2009 14:18:55 GMT"
}
] | 2009-02-12T00:00:00 | [
[
"Astala",
"Kari",
""
],
[
"Gill",
"James",
""
],
[
"Rohde",
"Steffen",
""
],
[
"Saksman",
"Eero",
""
]
] | [
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] |
801.4625 | Kupcic Ivan | Ivan Kupcic | Thermally activated charge carriers and mid-infrared optical excitations
in quarter-filled CDW systems | 12 pages, 9 figures | Eur. Phys. J. B 62, 27 (2008) | 10.1140/epjb/e2008-00128-7 | null | cond-mat.str-el | null | The optical properties of the quarter-filled single-band CDW systems have
been reexamined in the model with the electron-phonon coupling related to the
variations of electron site energies. It appears that the indirect,
electron-mediated coupling between phase phonons and external electromagnetic
fields vanishes for symmetry reasons, at variance with the infrared selection
rules used in the generally accepted microscopic theory. It is shown that the
phase phonon modes and the electric fields couple directly, with the coupling
constant proportional to the magnitude of the charge-density wave. The
single-particle contributions to the optical conductivity tensor are determined
for the ordered CDW state and the related weakly doped metallic state by means
of the Bethe--Salpeter equations for elementary electron-hole excitations. It
turns out that this gauge-invariant approach establishes a clear connection
between the effective numbers of residual, thermally activated and bound charge
carriers. Finally, the relation between these numbers and the activation energy
of dc conductivity and the optical CDW gap scale is explained in the way
consistent with the conductivity sum rules.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 09:20:49 GMT"
}
] | 2008-05-28T00:00:00 | [
[
"Kupcic",
"Ivan",
""
]
] | [
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] |
801.4626 | Maria Jose Calderon | D. Sanchez, M.J. Calderon, J. Sanchez-Benitez, A.J. Williams, J.P.
Attfield, P.A. Midgley, and N.D. Mathur | Limited local electron-lattice coupling in manganites | 9 pages, 4 figures; accepted in Physical Review B | Phys. Rev. B 77, 092411 (2008) | 10.1103/PhysRevB.77.092411 | null | cond-mat.str-el | null | (Pr,Ca)MnO3 is the archetypal charge-ordered manganite, but in
Pr0.48Ca0.52MnO3 we find (using convergent-beam electron diffraction and
dark-field images) that the superlattice period is locally incommensurate with
respect to the parent lattice, and that the superlattice orientation possesses
significant local variations. This suggests that local electron-lattice
coupling never overwhelmingly dominates the rich physics of manganites, even in
the most extreme scenarios that produce the largest colossal magnetoresistance
effects.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 09:24:42 GMT"
}
] | 2008-03-27T00:00:00 | [
[
"Sanchez",
"D.",
""
],
[
"Calderon",
"M. J.",
""
],
[
"Sanchez-Benitez",
"J.",
""
],
[
"Williams",
"A. J.",
""
],
[
"Attfield",
"J. P.",
""
],
[
"Midgley",
"P. A.",
""
],
[
"Mathur",
"N. D.",
""
]
] | [
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] |
801.4627 | Ulrike Schneider | Benedikt M. P\"otscher and Ulrike Schneider | On the Distribution of the Adaptive LASSO Estimator | revised version; minor changes and some material added | J. Stat. Plann. Inference 139 (2009) 2775-2790 | 10.1016/j.jspi.2009.01.003 | null | math.ST stat.ME stat.ML stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the distribution of the adaptive LASSO estimator (Zou (2006)) in
finite samples as well as in the large-sample limit. The large-sample
distributions are derived both for the case where the adaptive LASSO estimator
is tuned to perform conservative model selection as well as for the case where
the tuning results in consistent model selection. We show that the
finite-sample as well as the large-sample distributions are typically highly
non-normal, regardless of the choice of the tuning parameter. The uniform
convergence rate is also obtained, and is shown to be slower than $n^{-1/2}$ in
case the estimator is tuned to perform consistent model selection. In
particular, these results question the statistical relevance of the `oracle'
property of the adaptive LASSO estimator established in Zou (2006). Moreover,
we also provide an impossibility result regarding the estimation of the
distribution function of the adaptive LASSO estimator.The theoretical results,
which are obtained for a regression model with orthogonal design, are
complemented by a Monte Carlo study using non-orthogonal regressors.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 09:57:44 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Dec 2008 12:42:12 GMT"
}
] | 2009-04-28T00:00:00 | [
[
"Pötscher",
"Benedikt M.",
""
],
[
"Schneider",
"Ulrike",
""
]
] | [
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] |
801.4628 | Yuri A. Kordyukov | Jes\'us A. \'Alvarez L\'opez, Yuri A. Kordyukov | Transversality and Lefschetz numbers for foliation maps | 29 pages | null | null | null | math.GT math.DG | null | Let $F$ be a smooth foliation on a closed Riemannian manifold $M$, and let
$\Lambda$ be a transverse invariant measure of $F$. Suppose that $\Lambda$ is
absolutely continuous with respect to the Lebesgue measure on smooth
transversals. Then a topological definition of the $\Lambda$-Lefschetz number
of any leaf preserving diffeomorphism $(M,F)\to(M,F)$ is given. For this
purpose, standard results about smooth approximation and transversality are
extended to the case of foliation maps. It is asked whether this topological
$\Lambda$-Lefschetz number is equal to the analytic $\Lambda$-Lefschetz number
defined by Heitsch and Lazarov which would be a version of the Lefschetz trace
formula. Heitsch and Lazarov have shown such a trace formula when the fixed
point set is transverse to $F$.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 09:48:37 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"López",
"Jesús A. Álvarez",
""
],
[
"Kordyukov",
"Yuri A.",
""
]
] | [
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] |
801.4629 | Eric Matzner-Lober | Pierre Andre Cornillon, Nicolas Hengartner, Eric Matzner-Lober | Recursive Bias Estimation and $L_2$ Boosting | null | null | null | null | stat.ME stat.ML | null | This paper presents a general iterative bias correction procedure for
regression smoothers. This bias reduction schema is shown to correspond
operationally to the $L_2$ Boosting algorithm and provides a new statistical
interpretation for $L_2$ Boosting. We analyze the behavior of the Boosting
algorithm applied to common smoothers $S$ which we show depend on the spectrum
of $I-S$. We present examples of common smoother for which Boosting generates a
divergent sequence. The statistical interpretation suggest combining algorithm
with an appropriate stopping rule for the iterative procedure. Finally we
illustrate the practical finite sample performances of the iterative smoother
via a simulation study. simulations.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:22:22 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Cornillon",
"Pierre Andre",
""
],
[
"Hengartner",
"Nicolas",
""
],
[
"Matzner-Lober",
"Eric",
""
]
] | [
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] |
801.463 | Daniel Reese | D. Reese, F. Ligni\`eres, M. Rieutord | Regular patterns in the acoustic spectrum of rapidly rotating stars | 4 pages, 3 figures, 2 tables, accepted for publication in A&A | null | 10.1051/0004-6361:20078075 | null | astro-ph | null | Context: Rapid rotation modifies the structure of the frequency spectrum of
pulsating stars, thus making mode identification difficult.
Aims: We look for new forms of organisation for the frequency spectrum that
can provide a basis for mode identification at high rotation rates.
Methods: Acoustic modes in uniformly rotating polytropic models of stars are
computed using a numerical code that fully takes the effects of rotation
(centrifugal distortion and Coriolis acceleration) into account. All low-degree
modes, l=0 to 3, with radial orders n=1-10 and 21-25 for N=3 polytropic models
and n=1-10 for N=1.5 polytropic models are followed from a zero rotation rate
up to 59 % of the break-up velocity.
Results: We find an empirical formula that gives a good description of the
high-frequency range of the computed acoustic spectrum for high rotation rates.
Differences between this formula and complete eigenmode calculations are shown
to be substantially smaller than those obtained with a third order perturbative
method valid at low rotation rates.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:54:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Reese",
"D.",
""
],
[
"Lignières",
"F.",
""
],
[
"Rieutord",
"M.",
""
]
] | [
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] |
801.4631 | Gennady Lykasov I | G.I.Lykasov, A.N.Sissakian, A.S.Sorin, V.D.Toneev | Collective effects in central heavy-ion collisions | 5 pages, 2 figures. Talk given at 13th Lomonosov Conference on
Elementary Particle Physics, Moscow, Russia, August 23-29, 2007 | null | 10.1142/9789812837592_0050 | null | nucl-th | null | In-medium effects on transverse-mass distributions of quarks and gluons are
considered assuming a possible local equilibrium for colorless quark objects
(mesons and baryons) created in central A-A collisions. It is shown that the
average transverse momentum squared for these partons grows and then saturates
when the initial energy increases. Within the quark-gluon string model it leads
to the colliding energy dependence of hadron transverse mass spectra which is
similar to that observed in heavy ion collisions. Comparison with other
scenarios is given.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:07:09 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 08:50:32 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Lykasov",
"G. I.",
""
],
[
"Sissakian",
"A. N.",
""
],
[
"Sorin",
"A. S.",
""
],
[
"Toneev",
"V. D.",
""
]
] | [
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] |
801.4632 | Gunnar Pruessner | Kim Christensen, Nadia Farid, Gunnar Pruessner, Matthew Stapleton | On the scaling of probability density functions with apparent power-law
exponents less than unity | 6 pages, 2 figures, EPJB style | null | 10.1140/epjb/e2008-00173-2 | null | cond-mat.stat-mech | null | We derive general properties of the finite-size scaling of probability
density functions and show that when the apparent exponent \tautilde of a
probability density is less than 1, the associated finite-size scaling ansatz
has a scaling exponent \tau equal to 1, provided that the fraction of events in
the universal scaling part of the probability density function is non-vanishing
in the thermodynamic limit. We find the general result that \tau>=1 and
\tau>=\tautilde. Moreover, we show that if the scaling function G(x) approaches
a non-zero constant for small arguments, \lim_{x-> 0} G(x) > 0, then
\tau=\tautilde. However, if the scaling function vanishes for small arguments,
\lim_{x-> 0} G(x) = 0, then \tau=1, again assuming a non-vanishing fraction of
universal events. Finally, we apply the formalism developed to examples from
the literature, including some where misunderstandings of the theory of scaling
have led to erroneous conclusions.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:15:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Christensen",
"Kim",
""
],
[
"Farid",
"Nadia",
""
],
[
"Pruessner",
"Gunnar",
""
],
[
"Stapleton",
"Matthew",
""
]
] | [
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] |
801.4633 | Leonid Lutsev | L.V. Lutsev | Spin waves in disordered magnetic systems | 13 pages, 4 figures | null | null | null | cond-mat.dis-nn cond-mat.stat-mech | null | Long-wavelength spin waves in disordered magnetic systems have been
investigated. In the framework of the Heisenberg model with magnetic dipole and
exchange interactions between spins it is found that an additional longitudinal
spin wave mode appears. This mode is characterized by variations of the value
of the magnetic moment density. In order to analyse influence of the magnetic
disorder on spin wave dispersion relations, the special case of volume and
surface spin waves in the Damon-Eshbach (DE) geometry in films with magnetic
disorder is considered. It is revealed strong influence of the magnetic
disorder on surface spin waves, which consist of two branches -- the DE mode
and the longitudinal spin wave mode. Decrease of the ordering parameters leads
to a decrease of the initial frequency and the curve slope of the DE mode
dispersion curve and to an increase of the dispersion curve slope of the
longitudinal mode. If the spin noncollinearity is high, then the DE mode
dispersion assumes a curve with the backward character. It is found that the
dispersion relation of the longitudinal mode is weak temperature dependent. The
developed model can explain the observed double-peak structure of FMR spectra
in magnetic nanocomposites.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:21:45 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Lutsev",
"L. V.",
""
]
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801.4634 | Giuseppe D'Appollonio | Giuseppe D'Appollonio and Thomas Quella | The diagonal cosets of the Heisenberg group | 42 pages, v2: more explicit expressions for the background fields in
section 3.2.2, reference [49] added, some typos corrected | JHEP 0805:060,2008 | 10.1088/1126-6708/2008/05/060 | ITFA-2007-57, KCL-MTH-07-17 | hep-th | null | In this paper we study the diagonal cosets of the non-compact H4 WZW model.
Generalising earlier work by Antoniadis and Obers, we provide an exact
world-sheet description for several families of non-maximally symmetric
gravitational plane waves with background NS fluxes. We show that the
sigma-models that correspond to an asymmetric action of the gauge group
smoothly interpolate between singular and non-singular plane waves. We also
analyse the representations of the coset chiral algebra and derive the spectrum
of all the models.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:01:31 GMT"
},
{
"version": "v2",
"created": "Sat, 17 May 2008 18:59:38 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"D'Appollonio",
"Giuseppe",
""
],
[
"Quella",
"Thomas",
""
]
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] |
801.4635 | Benjamin Koch | Benjamin Koch | (2+3) dimensional geometrical dual of the complex Klein-Gordon equation | 6 pages, no figures | null | null | null | quant-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it is shown that an equivalent to the complex Klein-Gordon
equation can be obtained from the (2+3) dimensional Einstein equations coupled
to a conserved energy momentum tensor. In an explicit toy model we give
matching conditions for what corresponds to the phase, the amplitude, and the
mass of the complex wave function.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:44:25 GMT"
},
{
"version": "v2",
"created": "Thu, 22 Jan 2009 18:40:43 GMT"
}
] | 2009-01-22T00:00:00 | [
[
"Koch",
"Benjamin",
""
]
] | [
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] |
801.4636 | Jung Kyu Canci | J.K. Canci | Rational periodic points for quadratic maps | 32 pages. To appear on Annales de l'Insitut Fourier. Corrected some
mistakes in the proofs of Lemma 6 and Lemma 8. Thanks to the referee | null | null | null | math.NT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $K$ be a number field. Let $S$ be a finite set of places of $K$
containing all the archimedean ones. Let $R_S$ be the ring of $S$-integers of
$K$. In the present paper we consider endomorphisms of $\pro$ of degree 2,
defined over $K$, with good reduction outside $S$. We prove that there exist
only finitely many such endomorphisms, up to conjugation by ${\rm PGL}_2(R_S)$,
admitting a periodic point in $\po$ of order $>3$. Also, all but finitely many
classes with a periodic point in $\po$ of order 3 are parametrized by an
irreducible curve.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:32:06 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Apr 2009 12:23:23 GMT"
},
{
"version": "v3",
"created": "Fri, 1 Apr 2011 10:26:51 GMT"
}
] | 2011-04-04T00:00:00 | [
[
"Canci",
"J. K.",
""
]
] | [
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] |
801.4637 | Mario Schweitzer | M. Schweitzer, B. Groves, H. Netzer, D. Lutz, E. Sturm, A. Contursi,
R. Genzel, L.J. Tacconi, S. Veilleux, D.-C. Kim, D. Rupke, A.J. Baker | Extended silicate dust emission in PG QSOs | 39 pages, 8 figures | null | 10.1086/587097 | null | astro-ph | null | This paper addresses the origin of the silicate emission observed in PG QSOs,
based on observations with the Spitzer Space Telescope. Scenarios based on the
unified model suggest that silicate emission in AGN arises mainly from the
illuminated faces of the clouds in the torus at temperatures near sublimation.
However, detections of silicate emission in Type 2 QSOs, and the estimated cool
dust temperatures, argue for a more extended emission region.To investigate
this issue we present the mid-infrared spectra of 23 QSOs. These spectra, and
especially the silicate emission features at ~10 and ~18 mu can be fitted using
dusty narrow line region (NLR) models and a combination of black bodies. The
bolometric luminosities of the QSOs allow us to derive the radial distances and
covering factors for the silicate-emitting dust. The inferred radii are 100-200
times larger than the dust sublimation radius, much larger than the expected
dimensions of the inner torus. Our QSO mid-IR spectra are consistent with the
bulk of the silicate dust emission arising from the dust in the innermost parts
of the NLR.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:32:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schweitzer",
"M.",
""
],
[
"Groves",
"B.",
""
],
[
"Netzer",
"H.",
""
],
[
"Lutz",
"D.",
""
],
[
"Sturm",
"E.",
""
],
[
"Contursi",
"A.",
""
],
[
"Genzel",
"R.",
""
],
[
"Tacconi",
"L. J.",
""
],
[
"Veilleux",
"S.",
""
],
[
"Kim",
"D. -C.",
""
],
[
"Rupke",
"D.",
""
],
[
"Baker",
"A. J.",
""
]
] | [
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] |
801.4638 | Kostas Glampedakis | K. Glampedakis, N. Andersson, D.I. Jones | Do superfluid instabilities prevent neutron star precession? | 17 pages, 6 eps figures | null | 10.1111/j.1365-2966.2008.13995.x | null | astro-ph | null | We discuss short wavelength (inertial wave) instabilities present in the
standard two-fluid neutron star model when there is sufficient relative flow
along the superfluid neutron vortex array. We demonstrate that these
instabilities may be triggered in precessing neutron stars, since the angular
velocity vectors of the neutron and proton fluids are misaligned during
precession. The presence of such an instability would render the standard,
solid body rotation, model for free precession inconsistent. Our results
suggest that the standard (Eulerian) slow precession that results for weak drag
between the vortices and the charged fluid (protons and electrons) is not
seriously constrained by the existence of the instability. In contrast, the
fast precession, which results when vortices are strongly coupled to the
charged component, is generally unstable. This implies that fast precession may
not be realised in astrophysical systems
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:33:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Glampedakis",
"K.",
""
],
[
"Andersson",
"N.",
""
],
[
"Jones",
"D. I.",
""
]
] | [
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] |
801.4639 | Carlo Giunti | Carlo Giunti | Comment on the Neutrino-Mixing Interpretation of the GSI Time Anomaly | 5 pages. Revised Addendum 2: Quantum effects in GSI nuclear decay are
possible | null | null | null | hep-ph astro-ph hep-ex nucl-ex nucl-th | null | It is shown that neutrino mixing cannot explain the GSI time anomaly,
refuting recent claims in this direction. Addendum 1: Remarks on
arXiv:0801.1465. Addendum 2: Quantum effects in GSI nuclear decay.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 15:04:36 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 14:13:41 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Apr 2008 21:34:04 GMT"
}
] | 2008-04-18T00:00:00 | [
[
"Giunti",
"Carlo",
""
]
] | [
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801.464 | Seung Woo Ham | S. W. Ham, E. J. Yoo, S. K. OH, and D. Son | Higgs bosons of a supersymmetric $U(1)'$ model at the ILC | 12 pages, 2 figures, 1 table, PRD | Phys.Rev.D77:114011,2008 | 10.1103/PhysRevD.77.114011 | null | hep-ph | null | We study the scalar Higgs sector of the next-to-minimal supersymmetric
standard model with an extra U(1), which has two Higgs doublets and a Higgs
singlet, in the light leptophobic $Z'$ scenario where the extra neutral gauge
boson $Z'$ does not couple to charged leptons. In this model, we find that the
sum of the squared coupling coefficients of the three neutral scalar Higgs
bosons to $ZZ$, normalized by the corresponding SM coupling coefficient is
noticeably smaller than unity, due to the effect of the extra U(1), for a
reasonable parameter space of the model, whereas it is unity in the
next-to-minimal supersymmetric standard model. Thus, these two models may be
distinguished if the coupling coefficients of neutral scalar Higgs bosons to
$ZZ$ are measured at the future International Linear Collider by producing them
via the Higgs-strahlung, $ZZ$ fusion, and $WW$ fusion processes.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:41:17 GMT"
},
{
"version": "v2",
"created": "Sat, 26 Apr 2008 06:47:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ham",
"S. W.",
""
],
[
"Yoo",
"E. J.",
""
],
[
"OH",
"S. K.",
""
],
[
"Son",
"D.",
""
]
] | [
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] |
801.4641 | Myron Kapetanakis | J. Chovan and I. E. Perakis | Femtosecond Control of the Magnetization in Ferromagnetic Semiconductors | 16 pages, 9 figures, accepted to Physical Review B | null | 10.1103/PhysRevB.77.085321 | null | cond-mat.str-el | null | We develop a theory of collective spin dynamics triggered by ultrafast
optical excitation of ferromagnetic semiconductors. Using the density matrix
equations of motion in the mean field approximation and including magnetic
anisotropy and hole spin dephasing effects, we predict the development of a
light--induced magnetization tilt during ultra--short time intervals comparable
to the pulse duration. This femtosecond dynamics in the coherent temporal
regime is governed by the interband nonlinear optical polarizations and is
followed by a second temporal regime governed by the magnetic anisotropy of the
Fermi sea. We interpret our numerical results by deriving a
Landau--Gilbert--like equation for the collective spin, which demonstrates an
ultrafast correction to the magnetic anisotropy effective field due to second
order coherent nonlinear optical processes. Using the Lindblad semigroup
method, we also derive a contribution to the interband polarization dephasing
determined by the Mn spin and the hole spin dephasing. Our predicted
magnetization tilt and subsequent nonlinear dynamics due to the magnetic
anisotropy can be controlled by varying the optical pulse intensity, duration,
and helicity and can be observed with pump--probe magneto--optical
spectroscopy.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:41:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chovan",
"J.",
""
],
[
"Perakis",
"I. E.",
""
]
] | [
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801.4642 | Pavel Ratnikov | P. V. Ratnikov and A. P. Silin (Lebedev Physics Institute) | Ground State Energy of Current Carriers in Graphene | 9 pages, 5 figures | Kratkie Soobshcheniya po Fizike, No. 1, pp. 46-56 (2008) [Bulletin
of the Lebedev Physics Institute] | null | null | cond-mat.other cond-mat.mtrl-sci | null | The ground state energy of current carriers in graphene considered as a
zero-gap semiconductor was calculated in the two-band approximation. The
condition of the electronic (hole) system stability in graphene was obtained.
The possibility of the zero-gap semiconductor-semimetal transition was
discussed.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:41:50 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Ratnikov",
"P. V.",
"",
"Lebedev Physics Institute"
],
[
"Silin",
"A. P.",
"",
"Lebedev Physics Institute"
]
] | [
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801.4643 | Corinne Charbonnel | Suzanne Talon, Corinne Charbonnel | Angular momentum transport by internal gravity waves. IV - Wave
generation by surface convection zone, from the pre-main sequence to the
early-AGB in intermediate mass stars | A&A in press; 11 figures | null | 10.1051/0004-6361:20078620 | null | astro-ph | null | This is the fourth in a series of papers that deal with angular momentum
transport by internal gravity waves in stellar interiors. Here, we want to
examine the potential role of waves in other evolutionary phases than the main
sequence. We study the evolution of a 3Msun Population I model from the
pre-main sequence to the early-AGB phase and examine whether waves can lead to
angular momentum redistribution and/or element diffusion at the external
convection zone boundary. We find that, although waves produced by the surface
convection zone can be ignored safely for such a star during the main sequence,
it is not the case for later evolutionary stages. In particular, angular
momentum transport by internal waves could be quite important at the end of the
sub-giant branch and during the early-AGB phase. Wave-induced mixing of
chemicals is expected during the early-AGB phase.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:46:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Talon",
"Suzanne",
""
],
[
"Charbonnel",
"Corinne",
""
]
] | [
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] |
801.4644 | A Sameen | K. C. Sahu, A. Sameen and R. Govindarajan | The relative roles of divergence and velocity slip in the stability of
plane channel flow | This paper has been withdrawn by the authors. 6 pages, 7 figures,
Euro. Phys. J. Appl. Phys., 44(1), 101-107 | null | 10.1051/epjap:2008141 | null | physics.flu-dyn | null | Wall slip and wall divergence are known to have large and opposing effects on
the stability of flow in a two-dimensional channel. While divergence hugely
destabilises, slip dramatically stabilizes the linear mode. In a non-parallel
stability analysis, we study a combination of these two effects, since both
will coexist in small-scale flows with wall roughness. Our main results are (i)
that the stabilising effect of slip is reversed at higher angles of divergence,
(ii) transient growth of disturbances is unaffected by either wall-divergence,
or by slip at any divergence. Moreover, at the Reynolds numbers relevant here,
transient growth is too low to be a significant player in transition to
turbulence, which is more likely to be driven by linear instability.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 10:54:11 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Oct 2010 10:13:42 GMT"
}
] | 2010-10-19T00:00:00 | [
[
"Sahu",
"K. C.",
""
],
[
"Sameen",
"A.",
""
],
[
"Govindarajan",
"R.",
""
]
] | [
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] |
801.4645 | Andrzej Bialas | A.Bialas and W.Czyz | Renyi entropies of a black hole from Hawking radiation | 10 pages | Europhys.Lett.83:60009,2008 | 10.1209/0295-5075/83/60009 | null | gr-qc | null | Renyi entropies of a black hole are evaluated by counting the states of the
Hawking radiation which fills a thin shell surrounding the horizon. The width
of the shell is determined from its energy content and the corresponding mass
defect. The Bekenstein-Hawking formula for the entropy of the black hole is
correctly reproduced.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 11:00:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bialas",
"A.",
""
],
[
"Czyz",
"W.",
""
]
] | [
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] |
801.4646 | Egle Tomasi-Gustafsson | G. I. Gakh and E. Tomasi--Gustafsson | General analysis of two--photon exchange in elastic electron--$^4He$
scattering and $e^++e^-\to \pi^++\pi^-.$ | 15 pages 1 figure | Nucl.Phys.A838:50-60,2010 | 10.1016/j.nuclphysa.2010.03.005 | null | nucl-th | null | Using a general parametrization of the spin structure of the matrix element
for the elastic $e^-+^4He$ scattering and for the annihilation $e^++e^-\to
\pi^++\pi^-$ reactions in terms of two complex amplitudes, we derive general
properties of the observables in presence of two--photon exchange. We show that
this mechanism induces a specific dependence of the differential cross section
on the angle of the emitted particle. We reanalyze the existing experimental
data on the differential cross section, for elastic electron scattering on
$^4He$, in the light of this result.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 11:13:39 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Gakh",
"G. I.",
""
],
[
"Tomasi--Gustafsson",
"E.",
""
]
] | [
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] |
801.4647 | Roldao da Rocha | Roldao da Rocha, Alex E. Bernardini, Jayme Vaz Jr | k-deformed Poincare algebras and quantum Clifford-Hopf algebras | 10 pages, RevTeX, one Section and references added, improved content. | Int.J.Geom.Meth.Mod.Phys. 7 (2010) 821-836 | 10.1142/S0219887810004567 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Minkowski spacetime quantum Clifford algebra structure associated with
the conformal group and the Clifford-Hopf alternative k-deformed quantum
Poincare algebra is investigated in the Atiyah-Bott-Shapiro mod 8 theorem
context. The resulting algebra is equivalent to the deformed anti-de Sitter
algebra U_q(so(3,2)), when the associated Clifford-Hopf algebra is taken into
account, together with the associated quantum Clifford algebra and a (not
braided) deformation of the periodicity Atiyah-Bott-Shapiro theorem.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 11:19:24 GMT"
},
{
"version": "v2",
"created": "Thu, 1 Apr 2010 20:33:03 GMT"
}
] | 2010-09-28T00:00:00 | [
[
"da Rocha",
"Roldao",
""
],
[
"Bernardini",
"Alex E.",
""
],
[
"Vaz",
"Jayme",
"Jr"
]
] | [
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] |
801.4648 | Ian Boutle | I. A. Boutle, R. J. Beare, S. E. Belcher and R. S. Plant | A note on boundary-layer friction in baroclinic cyclones | 5 pages, 3 figures | Quarterly Journal of the Royal Meteorological Society, 133,
2137-2141 (2007) | 10.1002/qj.179 | null | physics.ao-ph physics.flu-dyn | null | The interaction between extratropical cyclones and the underlying boundary
layer has been a topic of recent discussion in papers by Adamson et. al. (2006)
and Beare (2007). Their results emphasise different mechanisms through which
the boundary layer dynamics may modify the growth of a baroclinic cyclone. By
using different sea-surface temperature distributions and comparing the
low-level winds, the differences are exposed and both of the proposed
mechanisms appear to be acting within a single simulation.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 11:24:02 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Boutle",
"I. A.",
""
],
[
"Beare",
"R. J.",
""
],
[
"Belcher",
"S. E.",
""
],
[
"Plant",
"R. S.",
""
]
] | [
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801.4649 | Markus Roellig | Markus Roellig | Metallicity Effects in PDRs | 7 pages, 5 figures, to appear in proceedings of "Far-Infrared and
Submillimeter Emission of the Interstellar Medium", EAS Publication Series,
Bad Honnef, November 2007, Eds. C. Kramer, S. Aalto, R. Simon | null | 10.1051/eas:0831026 | null | astro-ph | null | Almost all properties of a photodissociation region (PDR) depend on its
metallicity. The heating and cooling efficiencies that determine the
temperature of the gas and dust, the dust composition, as well as the elemental
abundances that influence the chemical structure of the PDR are just three
examples that demonstrate the importance of metallicity effects in PDRs. PDRs
are often associated with sites of star formation. If we want to understand the
star formation history of our own Galaxy and of distant low-metallicity objects
we need to understanding how metallicity acts on PDR physics and chemistry.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 11:41:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Roellig",
"Markus",
""
]
] | [
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] |
801.465 | Alexander Donkov | A. Donkov, M. M. Korshunov, I. Eremin, P. Lemmens, V. Gnezdilov, F. C.
Chou, C. T. Lin | Electron-phonon interaction in the lamellar cobaltate Na$_x$CoO$_2$ | 5 pages, 2 figures (submitted to PRB) | Phys. Rev. B 77, 100504(R) (2008) | 10.1103/PhysRevB.77.100504 | null | cond-mat.str-el | null | We study theoretically and experimentally the dependence of the
electron-phonon interaction in Na$_x$CoO$_2$ on the sodium concentration $x$.
For the two oxygen phonon modes found in Raman experiments, $A_{1g}$ and
$E_{1g}$, we calculate the matrix elements of the electron-phonon interaction.
Analyzing the feedback effect of the conduction electrons on the phonon
frequency we compare the calculated and experimentally observed doping
dependence of the $A_{1g}$ mode. Furthermore, due to the momentum dependence of
the electron-phonon coupling for the $E_{1g}$ symmetry we find no
renormalization of the corresponding phonon frequency which agrees with
experiment. Our results shed light on the possible importance of the
electron-phonon interaction in this system.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 11:45:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Donkov",
"A.",
""
],
[
"Korshunov",
"M. M.",
""
],
[
"Eremin",
"I.",
""
],
[
"Lemmens",
"P.",
""
],
[
"Gnezdilov",
"V.",
""
],
[
"Chou",
"F. C.",
""
],
[
"Lin",
"C. T.",
""
]
] | [
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] |
801.4651 | Arif Akhundov A. | Arif Akhundov | Precision Tests of Electroweak Interactions | 10 pages (LaTeX), 6 figures. Added references, updated Figures 3, 4,
5 and 6. Plenary talk at UAE-CERN Workshop: High Energy Physics and
Applications, Al-Ain, UAE, 26-28 Nov. 2007 | AIPConf.Proc.1006:43-48,2008 | 10.1063/1.2927618 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The status of the precision tests of the electroweak interactions is reviewed
in this paper. An emphasis is put on the Standard Model analysis based on
measurements at LEP/SLC and the Tevatron. The results of the measurements of
the electroweak mixing angle in the NuTeV experiment and the future prospects
are discussed.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:10:17 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 20:56:16 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Aug 2008 23:27:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Akhundov",
"Arif",
""
]
] | [
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] |
801.4652 | Said El Marzguioui | Said El Marzguioui and Jan Wiegerinck | Connectedness in the Pluri-fine Topology | 13 pages | null | null | null | math.CV | null | We study connectedness in the pluri-fine topology on $\CC^n$ and obtain the
following results. If $\Omega$ is a pluri-finely open and pluri-finely
connected set in $\CC^n$ and $E\subset\CC^n$ is pluripolar, then
$\Omega\setminus E$ is pluri-finely connected. The proof hinges on precise
information about the structure of open sets in the pluri-fine topology: Let
$\Omega$ be a pluri-finely open subset of $\CC^{n}$. If $z$ is any point in
$\Omega$, and $L$ is a complex line passing through $z$, then obviously $\Omega
\cap L$ is a finely open neighborhood of $z$ in $L$. Now let $C_L$ denote the
finely connected component of $z$ in $\Omega\cap L$. Then $\cup_{L\ni z} C_L$
is a pluri-finely connected neighborhood of $z$. As a consequence we find that
if $v$ is a finely plurisubharmonic function defined on a pluri-finely
connected pluri-finely open set, then $v= -\infty$ on a pluri-finely open
subset implies $v\equiv -\infty$.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 11:57:20 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Marzguioui",
"Said El",
""
],
[
"Wiegerinck",
"Jan",
""
]
] | [
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] |
801.4653 | Seung-il Nam | Seung-il Nam and Hyun-Chul Kim | Pion electromagnetic charge radii and rho-meson mass shift at finite
density | 11 pages, 5 figures, submitted to Phys.Lett.B | J.Korean Phys.Soc.59:217,2011 | null | YITP-07-66, Inha-NTG-01/2008 | hep-ph | null | We investigate the pion electromagnetic charge radii and mass dropping of the
rho meson at finite density. We first calculate the pion charge radii within
the framework of the nonlocal chiral quark model from the instanton vacuum both
at zero and finite densities. In order to relate the change of the pion charge
radius to that of the rho-meson mass at finite density, we employ the
vector-meson dominance for the pion electromagnetic form factor. It turns out
that the pion charge radius is getting larger as the quark chemical potential
increases. As a result, the rho-meson mass falls off as the quark chemical
potential grows and is found to be dropped by about 10% at normal nuclear
matter density: m*_rho/m_rho ~ 1 - 0.12 mu_B/mu_0, which is compatible to the
results of the measurement at the KEK recently.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:09:40 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 05:23:27 GMT"
}
] | 2011-08-19T00:00:00 | [
[
"Nam",
"Seung-il",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] | [
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] |
801.4654 | Mili Biswas | M. Biswas, Subinit Roy, M. Sinha, M.K. Pradhan, A. Mukherjee, P. Basu,
H. Majumdar, K. Ramachandran, A. Shrivastava | The study of threshold behaviour of effective potential for
$^{6}$Li+$^{58,64}$Ni systems | 23 pages, 7 figures, Accepted for publication in Nuclear Physics A | Nucl.Phys.A802:67-81,2008 | 10.1016/j.nuclphysa.2008.01.025 | null | nucl-ex | null | The elastic scattering for $^6$Li+$^{64}$Ni system was measured in the
bombarding energy range of 13 MeV $\leq$ $E_{lab}$ $\leq$ 26 MeV. A
phenomenological optical model analysis was performed and the behaviour of the
surface strengths of the potential components with decreasing energy was
extracted. A further analysis of the measured angular distributions, along with
the existing data for $^6$Li+$^{58}$Ni, was performed with two different model
potentials - one with the folded potential normalized with a complex factor
(OMP1) and the other with a {\it hybrid} potential composed of a renormalized
folded real and a phenomenological imaginary (OMP2) potential components - were
used in the calculation. All the model potentials predict similar energy
dependent behaviour for the interaction potential around the barrier. The
observed energy dependence of the strengths of the real and imaginary
potentials corroborate with the dispersion relation prediction for both the
$^6$Li+$^{64}$Ni and $^6$Li+$^{58}$Ni systems. Though the evidence of breakup
is distinct in the energy variation of the potential strengths, close to the
barrier the variation is more in the line of conventional threshold anomaly.
Also the threshold behaviour of the interaction potential does not indicate any
distinct isotopic dependence.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:07:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Biswas",
"M.",
""
],
[
"Roy",
"Subinit",
""
],
[
"Sinha",
"M.",
""
],
[
"Pradhan",
"M. K.",
""
],
[
"Mukherjee",
"A.",
""
],
[
"Basu",
"P.",
""
],
[
"Majumdar",
"H.",
""
],
[
"Ramachandran",
"K.",
""
],
[
"Shrivastava",
"A.",
""
]
] | [
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-0.0218246002
] |
801.4655 | Andreas Kyprianou A.E. | Andreas E. Kyprianou and Ronnie Loeffen | Refracted Levy processes | null | null | null | null | math.PR math.OC | null | Motivated by classical considerations from risk theory, we investigate
boundary crossing problems for refracted L\'evy processes. The latter is a
L\'evy process whose dynamics change by subtracting off a fixed linear drift
(of suitable size) whenever the aggregate process is above a pre-specified
level. More formally, whenever it exists, a refracted L\'evy process is
described by the unique strong solution to the stochastic differential equation
\[ \D U_t = - \delta \mathbf{1}_{\{U_t >b\}}\D t + \D X_t \] where $X=\{X_t
:t\geq 0\}$ is a L\'evy process with law $\mathbb{P}$ and $b, \delta\in
\mathbb{R}$ such that the resulting process $U$ may visit the half line
$(b,\infty)$ with positive probability. We consider in particular the case that
$X$ is spectrally negative and establish a suite of identities for the case of
one and two sided exit problems. All identities can be written in terms of the
$q$-scale function of the driving L\'evy process and its perturbed version
describing motion above the level $b$. We remark on a number of applications of
the obtained identities to (controlled) insurance risk processes.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:09:02 GMT"
},
{
"version": "v2",
"created": "Mon, 12 May 2008 17:27:20 GMT"
}
] | 2008-05-12T00:00:00 | [
[
"Kyprianou",
"Andreas E.",
""
],
[
"Loeffen",
"Ronnie",
""
]
] | [
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] |
801.4656 | Maria Lu\'isa Arruda | AMS Collaboration: Lu\'isa Arruda | Cosmic Ray Velocity and Electric Charge Measurements in the AMS
experiment | 6 pages. Contribution to the 20th Lake Louise Winter Institute (Lake
Louise, Canada 2005). Presenter: Luisa Arruda on behalf of the AMS
collaboration | Proceedings of the 20th Lake Louise Winter Institute (Lake Louise,
Canada 2005), p. 98-103, World Scientific | null | null | astro-ph | null | The Alpha Magnetic Spectrometer (AMS) is a particle physics detector designed
to measure charged cosmic ray spectra with energies up to the TeV region and
with high energy photon detection capability up to few hundred GeV. It will be
installed on the International Space Station (ISS) in 2008 and will operate for
more than three years. Due to its large acceptance, the flight duration and the
state-of-art of particle identification techniques, AMS will have a remarkable
sensitivity on antimatter and dark matter searches. The addition of different
detector systems provide AMS with complementary and redundant electric charge
and velocity measurements. The velocity of singly charged particles is expected
to be measured with a precision of 0.1% and charge separation up to iron is
attainable. The AMS capability of measuring a large range of electric charges
and accurate velocities, will largely contribute to a better understanding of
cosmic ray production, acceleration and propagation mechanisms in the galaxy.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:37:21 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"AMS Collaboration",
"",
""
],
[
"Arruda",
"Luísa",
""
]
] | [
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801.4657 | Michael Pohlen | David Martinez-Delgado (1,2), Michael Pohlen (3), R. Jay Gabany (4),
Steven R. Majewski (5), Jorge Penarrubia (6), Chris Palma (7)((1) Instituto
de Astrofisica de Canarias E, (2) Max-Planck Institut fuer Astronomie D, (3)
Cardiff University UK, (4) BlackBird Observatory USA, (5) University of
Virginia USA, (6) University of Victoria CDN, (7) Penn State University USA) | Discovery of a Giant Stellar Tidal Stream Around the Disk Galaxy NGC
4013 | Comments: LaTeX, ApJ preprint style, 21 pages, 6 figures (reduced
quality), ApJ accepted. A high resolution version of the paper in addition to
a full version of the colour image of NGC 4013 can be found at
http://www.cosmotography.com/images/iac/ngc4013.html . Replaced to match
accepted version after revisions following referee's report | Astrophys.J.692:955-963,2009 | 10.1088/0004-637X/692/2/955 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report the discovery of a giant, loop-like stellar structure around the
edge-on spiral galaxy NGC 4013. This arcing feature extends 6 arcmin (~26 kpc
in projected distance) northeast from the center and 3 arcmin (~=12 kpc) from
the disk plane; likely related features are also apparent on the southwest side
of the disk, extending to 4 arcmin (~17 kpc). The detection of this low
surface-brightness muR= 27.0+0.3-0.2 mag/sqarcsec) structure is independently
confirmed in three separate datasets from three different telescopes.
Although its true three dimensional geometry is unknown, the sky- projected
morphology of this structure displays a match with the theoretical predictions
for the edge-on, projected view of a stellar tidal streams of a dwarf satellite
moving in a low inclined (~25deg), nearly circular orbit. Using the recent
model of the Monoceros tidal stream in the Milky Way by Penarrubia et al. as
template, we find that the progenitor system may have been a galaxy with an
initial mass 6*10^8 Msun, of which current position and final fate is unknown.
According to this simulation, the tidal stream may be approximately ~2.8 Gyr of
age.
Our results demonstrate that NGC 4013, previously considered a prototypical
isolated disk galaxy in spite of having one of the most prominent HI warps
detected thus far, may have in fact suffered a recent minor merger. This
discovery highlights that undisturbed disks at high surface brightness levels
in the optical but warped in HI maps may in fact reveal complex signatures of
recent accretion events in deep photometric surveys.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:22:38 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Oct 2008 10:57:52 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Martinez-Delgado",
"David",
""
],
[
"Pohlen",
"Michael",
""
],
[
"Gabany",
"R. Jay",
""
],
[
"Majewski",
"Steven R.",
""
],
[
"Penarrubia",
"Jorge",
""
],
[
"Palma",
"Chris",
""
]
] | [
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] |
801.4658 | Maria Lu\'isa Arruda | Lu\'isa Arruda, Fernando Bar\~ao, Jo\~ao Borges, Patr\'icia
Gon\c{c}alves, Rui Pereira, M\'ario Pimenta, Fernando Carmo | Isotopic mass separation with the RICH detector of the AMS Experiment | 6 pages. Contribution to the International School of Cosmic Ray
Astrophysics- 15th Course Astrophysics at Ultra-High Energies (Erice, Italy,
2006). Presenter: Luisa Arruda | Proceedings of the 15th Course Astrophysics at Ultra-High Energies
(Erice 2006), p. 145-150, World Scientific | null | null | astro-ph | null | The Alpha Magnetic Spectrometer (AMS) to be installed on the International
Space Station (ISS) will be equipped with a proximity focusing Ring Imaging
Cerenkov detector (RICH). Reconstruction of the Cerenkov angle and the electric
charge with RICH are discussed. A likelihood method for the Cerenkov angle
reconstruction was applied leading to a velocity determination for protons with
a resolution around 0.1%. The electric charge reconstruction is based on the
counting of the number of photoelectrons and on an overall efficiency
estimation on an event-by-event basis. The isotopic mass separation of helium
and beryllium is presented.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:35:00 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Arruda",
"Luísa",
""
],
[
"Barão",
"Fernando",
""
],
[
"Borges",
"João",
""
],
[
"Gonçalves",
"Patrícia",
""
],
[
"Pereira",
"Rui",
""
],
[
"Pimenta",
"Mário",
""
],
[
"Carmo",
"Fernando",
""
]
] | [
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] |
801.4659 | Kirone Mallick | Sylvain Prolhac and Kirone Mallick | Current Fluctuations in the exclusion process and Bethe Ansatz | 17 pages | J. Phys. A: Math. Theor. 41 (2008) 175002 | 10.1088/1751-8113/41/17/175002 | null | cond-mat.stat-mech | null | We use the Bethe Ansatz to derive analytical expressions for the current
statistics in the asymmetric exclusion process with both forward and backward
jumps. The Bethe equations are highly coupled and this fact has impeded their
use to derive exact results for finite systems. We overcome this technical
difficulty by a reformulation of the Bethe equations into a one variable
polynomial problem, akin to the functional Bethe Ansatz. The perturbative
solution of this equation leads to the cumulants of the current. We calculate
here the first two orders and derive exact formulae for the mean value of the
current and its fluctuations.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:32:09 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 14:35:45 GMT"
}
] | 2008-08-17T00:00:00 | [
[
"Prolhac",
"Sylvain",
""
],
[
"Mallick",
"Kirone",
""
]
] | [
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] |
801.466 | Olivier Giraud | B. Georgeot and O. Giraud | Quantum computing of semiclassical formulas | 8 pages, 1 figure | Phys. Rev. E 77, 046218 (2008) | 10.1103/PhysRevE.77.046218 | null | quant-ph nlin.CD | null | We show that semiclassical formulas such as the Gutzwiller trace formula can
be implemented on a quantum computer more efficiently than on a classical
device. We give explicit quantum algorithms which yield quantum observables
from classical trajectories, and which alternatively test the semiclassical
approximation by computing classical actions from quantum evolution. The gain
over classical computation is in general quadratic, and can be larger in some
specific cases.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:34:19 GMT"
}
] | 2008-09-03T00:00:00 | [
[
"Georgeot",
"B.",
""
],
[
"Giraud",
"O.",
""
]
] | [
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] |
801.4661 | Charles Bonatto | S. Ortolani, C. Bonatto, E. Bica, Y. Momany, B. Barbuy | The embedded cluster DBSB48 in the nebula Hoffleit18: comparison with
Trumpler14 | 25 pages, 11 figures. Accepted by New Astronomy | New Astron.13:508-518,2008 | 10.1016/j.newast.2008.01.008 | null | astro-ph | null | We derive fundamental parameters of the embedded cluster DBSB48 in the
southern nebula Hoffleit18 and the very young open cluster Trumpler14, by means
of deep JHKs infrared photometry. We build colour-magnitude and colour-colour
diagrams to derive reddening and age, based on main sequence and pre-main
sequence distributions. Radial stellar density profiles are used to study
cluster structure and guide photometric diagram extractions. Field-star
decontamination is applied to uncover the intrinsic cluster sequences in the
diagrams. Ages are inferred from K-excess fractions. A prominent
pre-main-sequence population is present in DBSB48, and the K-excess fraction
f_K=55+/-6% gives an age of 1.1+/-0.5Myr. A mean reddening of A_K_s=0.9+/-0.03
was found, corresponding to $A_V=8.2\pm0.3$. The cluster CMD is consistent with
the far kinematic distance of 5 kpc for Hoffleit 18. For Trumpler 14 we derived
similar parameters as in previous studies in the optical, in particular an age
of $1.7\pm0.7$ Myr. The fraction of stars with infrared excess in Trumpler 14
is $f_K=28\pm4%$. Despite the young ages, both clusters are described by a King
profile with core radii $\rc=0.46\pm0.05$ pc and $\rc=0.35\pm0.04$ pc,
respectively for DBSB 48 and Trumpler 14. Such cores are smaller than those of
typical open clusters. Small cores are probably related to the cluster
formation and/or parent molecular cloud fragmentation. In DBSB 48, the
magnitude extent of the upper main sequence is $\Delta \ks\approx2$ mag, while
in Trumpler 14 it is $\Delta \ks\approx5$ mag, consistent with the estimated
ages.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:35:55 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Ortolani",
"S.",
""
],
[
"Bonatto",
"C.",
""
],
[
"Bica",
"E.",
""
],
[
"Momany",
"Y.",
""
],
[
"Barbuy",
"B.",
""
]
] | [
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] |
801.4662 | Dierk Schleicher | Henk Bruin, Dierk Schleicher | Admissibility of kneading sequences and structure of Hubbard trees for
quadratic polynomials | 26 pages, 5 figures | null | 10.1112/jlms/jdn033 | null | math.DS math.CO | null | Hubbard trees are invariant trees connecting the points of the critical
orbits of postcritically finite polynomials. Douady and Hubbard \cite{Orsay}
introduced these trees and showed that they encode the essential information of
Julia sets in a combinatorial way. The itinerary of the critical orbit within
the Hubbard tree is encoded by a (pre)periodic sequence on $\{\0,\1\}$ called
\emph{kneading sequence}.
We prove that the kneading sequence completely encodes the Hubbard tree and
its dynamics, and we show how to reconstruct the tree and in particular its
branch points (together with their periods, their relative posititions, their
number of arms and their local dynamics) in terms of the kneading sequence
alone.
Every kneading sequence gives rise to an abstract Hubbard tree, but not every
kneading sequence occurs in real dynamics or in complex dynamics. Milnor and
Thurston \cite{MT} classified which kneading sequences occur in real dynamics;
we do the same for complex dynamics in terms of a complex \emph{admissibility
condition}. This complex admissibility condition fails if and only if the
abstract Hubbard tree has a so-called \emph{evil} periodic branch point that is
incompatible with local homeomorphic dynamics on the plane.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:36:09 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Bruin",
"Henk",
""
],
[
"Schleicher",
"Dierk",
""
]
] | [
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] |
801.4663 | Bounames Abdelhafid | N. Ferkous and A. Bounames | Energy Spectrum of a 2D Dirac Oscillator in the Presence of the
Aharonov-Bohm Effect | Latex, 12 pages | Physics Letters A 325 (2004) 21-29 | 10.1016/j.physleta.2004.03.033 | null | quant-ph | null | We determine the energy spectrum and the corresponding eigenfunctions of a 2D
Dirac oscillator in the presence of Aharonov-Bohm (AB) effect . It is shown
that the energy spectrum depends on the spin of particle and the AB magnetic
flux parameter. Finally, when the irregular solution occurs it is shown that
the energy takes particular values. The nonrelativistic limit is also
considered.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:39:35 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Ferkous",
"N.",
""
],
[
"Bounames",
"A.",
""
]
] | [
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801.4664 | Babatunde Okunoye | O. Okunoye Babatunde | A Molecular Model for Communication through a Secrecy System | 8 pages,7 figures | null | null | null | cs.CR | null | Codes have been used for centuries to convey secret information.To a
cryptanalyst, the interception of a code is only the first step in recovering a
secret message.Deoxyribonucleic acid (DNA) is a biological and molecular
code.Through the work of Marshall Nirenberg and others, DNA is now understood
to specify for amino acids in triplet codes of bases.The possibilty of DNA
encoding secret information in a natural language is explored, since a code is
expected to have a distinct mathematical solution.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:44:38 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Babatunde",
"O. Okunoye",
""
]
] | [
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] |
801.4665 | Dusa McDuff | Dusa McDuff | Symplectic embeddings of 4-dimensional ellipsoids | 24 pages, 9 figures; some proofs clarified, relation to continued
fractions explained. v3: references added, to appear in Journal of Topology | null | null | null | math.SG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how to reduce the problem of symplectically embedding one
4-dimensional rational ellipsoid into another to a problem of embedding
disjoint unions of balls into appropriate blow ups of \C P^2. For example, the
problem of embedding the ellipsoid E(1,k) into a ball B is equivalent to that
of embedding k disjoint equal balls into \C P^2, and so can be solved by the
work of Gromov, McDuff--Polterovich and Biran. (Here k is the ratio of the area
of the major axis to that of the minor axis.) As a consequence we show that the
ball may be fully filled by the ellipsoid E(1,k) for k=1,4 and all k\ge 9, thus
answering a question raised by Hofer.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:49:06 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Apr 2008 12:21:53 GMT"
},
{
"version": "v3",
"created": "Tue, 2 Dec 2008 20:44:03 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"McDuff",
"Dusa",
""
]
] | [
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] |
801.4666 | Bahlali Seid | Seid Bahlali | Stochastic maximum principle for optimal control problem of backward
systems with terminal condition in L1 | null | null | null | null | math.PR math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a stochastic control problem, where the control domain is convex
and the system is governed by a nonlinear backward stochastic differential
equation. With a L1 terminal data, we derive necessary optimality conditions in
the form of stochastic maximum principle.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 12:59:45 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jul 2008 10:47:52 GMT"
}
] | 2008-07-23T00:00:00 | [
[
"Bahlali",
"Seid",
""
]
] | [
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] |
801.4667 | Magne Guttormsen | M.Guttormsen, R.Chankova, U.Agvaanluvsan, E.Algin, L.A.Bernstein,
F.Ingebretsen, T.Lonnroth, S.Messelt, G.E.Mitchell, J.Rekstad, A.Schiller,
S.Siem, A.C.Larsen, A.Voinov, S.Odegaard | Radiative strength function in 96Mo reanalyzed | 2 figures | null | null | null | nucl-ex | null | The radiative strength functions of 96Mo have been reanalyzed. The enhanced
gamma strength for E_gamma < 3 - 4 MeV is confirmed.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 13:03:50 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Guttormsen",
"M.",
""
],
[
"Chankova",
"R.",
""
],
[
"Agvaanluvsan",
"U.",
""
],
[
"Algin",
"E.",
""
],
[
"Bernstein",
"L. A.",
""
],
[
"Ingebretsen",
"F.",
""
],
[
"Lonnroth",
"T.",
""
],
[
"Messelt",
"S.",
""
],
[
"Mitchell",
"G. E.",
""
],
[
"Rekstad",
"J.",
""
],
[
"Schiller",
"A.",
""
],
[
"Siem",
"S.",
""
],
[
"Larsen",
"A. C.",
""
],
[
"Voinov",
"A.",
""
],
[
"Odegaard",
"S.",
""
]
] | [
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] |
801.4668 | Bahlali Seid | Seid Bahlali | The strict and relaxed stochastic maximum principle for optimal control
problem of backward systems | null | null | null | null | math.PR math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a stochastic control problem where the set of controls is not
necessarily convex and the system is governed by a nonlinear backward
stochastic differential equation. We establish necessary as well as sufficient
conditions of optimality for two models. The first concerns the strict
(classical) controls. The second is an extension of the first to relaxed
controls, who are a measure valued processes.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 13:03:54 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jul 2008 10:12:52 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Jul 2008 10:47:06 GMT"
},
{
"version": "v4",
"created": "Thu, 28 Aug 2008 14:21:30 GMT"
},
{
"version": "v5",
"created": "Sat, 20 Dec 2008 14:19:12 GMT"
}
] | 2008-12-20T00:00:00 | [
[
"Bahlali",
"Seid",
""
]
] | [
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] |
801.4669 | Bahlali Seid | Seid Bahlali | A general stochastic maximum principle for mixed relaxed-singular
control problems | Submitted to Journal of Applied Mathematics and Stochastic Analysis | null | null | null | math.PR math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider in this paper, mixed relaxed-singular stochastic control
problems, where the control variable has two components, the first being
measure-valued and the second singular. The control domain is not necessarily
convex and the system is governed by a nonlinear stochastic differential
equation, in which the measure-valued part of the control enters both the drift
and the diffusion coefficients. We establish necessary optimality conditions,
of the Pontryagin maximum principle type, satisfied by an optimal
relaxed-singular control, which exist under general conditions on the
coefficients. The proof is based on the strict singular stochastic maximum
principle established by Bahlali-Mezerdi, Ekeland's variational principle and
some stability properties of the trajectories and adjoint processes with
respect to the control variable.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 13:05:49 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jul 2008 10:15:44 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Jul 2008 10:46:25 GMT"
},
{
"version": "v4",
"created": "Thu, 28 Aug 2008 14:22:23 GMT"
}
] | 2008-08-28T00:00:00 | [
[
"Bahlali",
"Seid",
""
]
] | [
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801.467 | Marika Schleberger Y | Ender Akcoeltekin, Sevilay Akcoeltekin, Orkhan Osmani, Henning Lebius,
Marika Schleberger | Swift heavy ion irradiation of SrTiO$_3$ under grazing incidence | 9 pages, 9 figures Submittted to NJP | null | 10.1088/1367-2630/10/5/053007 | null | cond-mat.mtrl-sci | null | The irradiation of SrTiO$_3$ single crystals with swift heavy ions leads to
modifications of the surface. The details of the morphology of these
modifications depends strongly on the angle of incidence and can be
characterized by atomic force microscopy. At glancing angles, discontinuous
chains of nanosized hillocks appear on the surface. The latent track radius can
be determined from the variation of the length of the chains with the angle of
incidence. This radius is material specific and allows the calculation of the
electron-phonon-coupling constant for SrTiO$_3$. We show that a theoretical
description of the nanodot creation is possible within a two-temperature model
if the spatial electron density is taken into account. The appearance of
discontinuous features can be explained easily within this model, but it turns
out that the electronic excitation dissipates on a femtosecond time scale and
thus too rapidly to feed sufficient energy into the phonon system in order to
induce a thermal melting process. We demonstrate that this can be solved if the
temperature dependent diffusion coefficient is introduced into the model.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 13:12:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Akcoeltekin",
"Ender",
""
],
[
"Akcoeltekin",
"Sevilay",
""
],
[
"Osmani",
"Orkhan",
""
],
[
"Lebius",
"Henning",
""
],
[
"Schleberger",
"Marika",
""
]
] | [
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] |
801.4671 | Tatyana P. Shestakova | T. P. Shestakova | Quantum cosmological solutions: their dependence on the choice of gauge
conditions and physical interpretation | 11 pages, 6 figures, talk presented at the International Conference
"Physical Interpretations of Relativity Theory - PIRT-2007" (Bauman
University, Moscow, July 2007) | Physical Interpretations of Relativity Theory: Proceedings of
International Meeting (Moscow, 2 - 5 July 2007), eds by M. C. Duffy, V. O.
Gladyshev, A. N. Morozov and P. Rowlands, Moscow, 2007, P. 104 - 112 | null | null | gr-qc | null | In "extended phase space" approach to quantum geometrodynamics numerical
solutions to Schrodinger equation corresponding to various choice of gauge
conditions are obtained for the simplest isotropic model. The "extended phase
space" approach belongs to those appeared in the last decade in which, as a
result of fixing a reference frame, the Wheeler - DeWitt static picture of the
world is replaced by evolutionary quantum geometrodynamics. Some aspects of
this approach were discussed at two previous PIRT meetings. We are interested
in the part of the wave function depending on physical degrees of freedom.
Three gauge conditions having a clear physical meaning are considered. They are
the conformal time gauge, the gauge producing the appearance of Lambda-term in
the Einstein equations, and the one covering the two previous cases as
asymptotic limits. The interpretation and discussion of the obtained solutions
is given.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 13:15:47 GMT"
}
] | 2008-01-31T00:00:00 | [
[
"Shestakova",
"T. P.",
""
]
] | [
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801.4672 | Chiara Menotti | Chiara Menotti and Nandini Trivedi | Spectral weight redistribution in strongly correlated bosons in optical
lattices | 14 pages, 12 figures | null | 10.1103/PhysRevB.77.235120 | null | cond-mat.other | null | We calculate the single-particle spectral function for the one-band
Bose-Hubbard model within the random phase approximation (RPA). In the strongly
correlated superfluid, in addition to the gapless phonon excitations, we find
extra gapped modes which become particularly relevant near the superfluid-Mott
quantum phase transition (QPT). The strength in one of the gapped modes, a
precursor of the Mott phase, grows as the QPT is approached and evolves into a
hole (particle) excitation in the Mott insulator depending on whether the
chemical potential is above (below) the tip of the lobe. The sound velocity of
the Goldstone modes remains finite when the transition is approached at a
constant density, otherwise, it vanishes at the transition. It agrees well with
Bogoliubov theory except close to the transition. We also calculate the spatial
correlations for bosons in an inhomogeneous trapping potential creating
alternating shells of Mott insulator and superfluid. Finally, we discuss the
capability of the RPA approximation to correctly account for quantum
fluctuations in the vicinity of the QPT.
| [
{
"version": "v1",
"created": "Wed, 30 Jan 2008 13:30:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Menotti",
"Chiara",
""
],
[
"Trivedi",
"Nandini",
""
]
] | [
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