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802.2503 | A. P. J. Jansen | A.P.J. Jansen | Island formation without attractive interactions | 11 pages, 4 figures | null | 10.1103/PhysRevB.77.073408 | null | cond-mat.stat-mech cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that adsorbates on surfaces can form islands even if there are no
attractive interactions. Instead strong repulsion between adsorbates at short
distances can lead to islands, because such islands increase the entropy of the
adsorbates that are not part of the islands. We suggest that this mechanism
cause the observed island formation in O/Pt(111), but it may be important for
many other systems as well.
| [
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802.2504 | Dominic Horsman | Dominic Horsman | An introduction to many worlds in quantum computation | Published version. This supercedes quant-ph/0210204. Comments welcome | Found. Phys. 39(8) August 2009 | 10.1007/s10701-009-9300-2 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interpretation of quantum mechanics is an area of increasing interest to
many working physicists. In particular, interest has come from those involved
in quantum computing and information theory, as there has always been a strong
foundational element in this field. This paper introduces one interpretation of
quantum mechanics, a modern `many-worlds' theory, from the perspective of
quantum computation. Reasons for seeking to interpret quantum mechanics are
discussed, then the specific `neo-Everettian' theory is introduced and its
claim as the best available interpretation defended. The main objections to the
interpretation, including the so-called ``problem of probability'' are shown to
fail. The local nature of the interpretation is demonstrated, and the
implications of this both for the interpretation and for quantum mechanics more
generally are discussed. Finally, the consequences of the theory for quantum
computation are investigated, and common objections to using many worlds to
describe quantum computing are answered. We find that using this particular
many-worlds theory as a physical foundation for quantum computation gives
several distinct advantages over other interpretations, and over not
interpreting quantum theory at all.
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802.2505 | Roberto D. Mota Esteves | D. Martinez, V. D. Granados and R. D. Mota | SU(2) Symmetry and Degeneracy From SUSY QM of a Neutron in the Magnetic
Field of a Linear Current | null | Phys.Lett.A350:31-35,2006 | 10.1016/j.physleta.2005.10.001 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From SUSY ladder operators in momentum space of a neutron in the magnetic
field of a linear current, we construct $2\times 2$ matrix operators that
together with the z-component of the angular momentum satisfy the su(2) Lie
algebra. We use this fact to explain the degeneracy of the energy spectrum.
| [
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""
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] |
802.2506 | Larry Bradley | L. D. Bradley, R. J. Bouwens, H. C. Ford, G. D. Illingworth, M. J.
Jee, N. Benitez, T. J. Broadhurst, M. Franx, B. L. Frye, L. Infante, V.
Motta, P. Rosati, R. L. White, W. Zheng | Discovery of a Very Bright Strongly-Lensed Galaxy Candidate at z ~ 7.6 | Accepted for publication in the Astrophysical Journal, 8 pages, 8
figures, updated to match version in press | null | 10.1086/533519 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using HST and Spitzer IRAC imaging, we report the discovery of a very bright
strongly lensed Lyman break galaxy (LBG) candidate at z~7.6 in the field of the
massive galaxy cluster Abell 1689. The galaxy candidate, which we refer to as
A1689-zD1, shows a strong z-J break of at least 2.2 mag and is completely
undetected (<1 sigma) in HST/ACS g, r, i, and z-band data. These properties,
combined with the very blue J-H and H-[4.5] colors, are exactly the properties
of an z~7.6 LBG and can only be reasonably fit by a star-forming galaxy at
z=7.6 +/- 0.4. Attempts to reproduce these properties with a model galaxy at
z<4 yield particularly poor fits. A1689-zD1 has an observed (lensed) magnitude
of 24.7 AB (8 sigma) in the NICMOS H band and is ~1.3 mag brighter than the
brightest-known z-dropout galaxy. When corrected for the cluster magnification
of 9.3 at z~7.6, the candidate has an intrinsic magnitude of H=27.1 AB, or
about an L* galaxy at z~7.6. The source-plane deprojection shows that the star
formation is occurring in compact knots of size ~<300 pc. The best-fit stellar
population synthesis models yield a median redshift of 7.6, stellar masses
(1.6-3.9) x 10^9 M_sun, stellar ages 45-320 Myr, star-formation rates ~<7.6
M_sun/yr, and low reddening with A_V <= 0.3. These properties are generally
similar to those of LBGs found at z~5-6. The inferred stellar ages suggest a
formation redshift of z~8-10 (t~<0.63 Gyr). A1689-zD1 is the brightest
observed, highly reliable z>7.0 galaxy candidate found to date.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 20:48:20 GMT"
},
{
"version": "v2",
"created": "Tue, 13 May 2008 19:15:14 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Bradley",
"L. D.",
""
],
[
"Bouwens",
"R. J.",
""
],
[
"Ford",
"H. C.",
""
],
[
"Illingworth",
"G. D.",
""
],
[
"Jee",
"M. J.",
""
],
[
"Benitez",
"N.",
""
],
[
"Broadhurst",
"T. J.",
""
],
[
"Franx",
"M.",
""
],
[
"Frye",
"B. L.",
""
],
[
"Infante",
"L.",
""
],
[
"Motta",
"V.",
""
],
[
"Rosati",
"P.",
""
],
[
"White",
"R. L.",
""
],
[
"Zheng",
"W.",
""
]
] | [
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] |
802.2507 | George Palasantzas | G. Palasantzas | Surface roughness influence on the quality factor of high frequency
nanoresonators | 13 pages, 4 figures, To appear in J. Appl. Phys. (2008) | null | 10.1063/1.2874790 | null | physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Surface roughness influences significantly the quality factor of high
frequency nanoresonators for large frequency - relaxation times within the
non-Newtonian regime, where a purely elastic dynamics develops. It is shown
that the influence of sort wavelength roughness, which is expressed by the
roughness exponent H for the case of self-affine roughness, plays significant
role in comparison with the effect of the long wavelength roughness parameters
such as the rms roughness amplitude and the lateral roughness correlation
length. Therefore, the surface morphology can play important role in designing
high-frequency resonators operating within the non-Newtonian regime.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 15:32:51 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Palasantzas",
"G.",
""
]
] | [
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] |
802.2508 | Marcus Kaiser | Marcus Kaiser, Matthias Goerner and Claus C. Hilgetag | Criticality of spreading dynamics in hierarchical cluster networks
without inhibition | null | New Journal of Physics, 9:110 (2007) | 10.1088/1367-2630/9/5/110 | null | q-bio.NC physics.soc-ph q-bio.PE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An essential requirement for the representation of functional patterns in
complex neural networks, such as the mammalian cerebral cortex, is the
existence of stable network activations within a limited critical range. In
this range, the activity of neural populations in the network persists between
the extremes of quickly dying out, or activating the whole network. The nerve
fiber network of the mammalian cerebral cortex possesses a modular organization
extending across several levels of organization. Using a basic spreading model
without inhibition, we investigated how functional activations of nodes
propagate through such a hierarchically clustered network. The simulations
demonstrated that persistent and scalable activation could be produced in
clustered networks, but not in random networks of the same size. Moreover, the
parameter range yielding critical activations was substantially larger in
hierarchical cluster networks than in small-world networks of the same size.
These findings indicate that a hierarchical cluster architecture may provide
the structural basis for the stable and diverse functional patterns observed in
cortical networks.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 16:23:22 GMT"
}
] | "2008-02-19T00:00:00" | [
[
"Kaiser",
"Marcus",
""
],
[
"Goerner",
"Matthias",
""
],
[
"Hilgetag",
"Claus C.",
""
]
] | [
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] |
802.2509 | Ilaria Biscardi | I. Biscardi (1,2), G. Raimondo (1), M. Cantiello (1,3) and E. Brocato
(1) ((1) INAF-Osservatorio Astronomico di Teramo, (2) Dipartimento di Fisica
- Universita' di Roma Tor Vergata, (3) Department of Physics and Astronomy,
Washington State University, Pullman, USA) | Optical Surface Brightness Fluctuations of shell galaxies towards 100
Mpc | 29 pages, 7 figures, 5 tables. Accepted for Publication in ApJ | null | 10.1086/587126 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We measure F814W Surface Brightness Fluctuations (SBF) for a sample of
distant shell galaxies with radial velocities ranging from 4000 to 8000 km/s.
The distance at galaxies is then evaluated by using the SBF method. For this
purpose, theoretical SBF magnitudes for the ACS@HST filters are computed for
single burst stellar populations covering a wide range of ages (t=1.5-14 Gyr)
and metallicities (Z=0.008-0.04). Using these stellar population models we
provide the first $\bar{M}_{F814W}$ versus $(F475W-F814W)_0$ calibration and we
extend the previous I-band versus $(B-I)_0$ color relation to colors
$(B-I)_{0}\leq 2.0$ mag. Coupling our SBF measurements with the theoretical
calibration we derive distances with a statistical uncertainty of $\sim 8%$,
and systematic error of $\sim 6 %$. The procedure developed to analyze data
ensures that the indetermination due to possible unmasked residual shells is
well below $\sim 12 %$. The results suggest that \emph{optical} SBFs can be
measured at $d \geq 100 Mpc$ with ACS@HST imaging. SBF-based distances coupled
with recession velocities corrected for peculiar motion, allow us obtain $H_{0}
= 76 \pm 6$ (statistical) $\pm 5$ (systematic) km/s/Mpc.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 16:20:45 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Biscardi",
"I.",
""
],
[
"Raimondo",
"G.",
""
],
[
"Cantiello",
"M.",
""
],
[
"Brocato",
"E.",
""
]
] | [
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802.251 | Paramita Dey | Paramita Dey, Anirban Kundu, Biswarup Mukhopadhyaya | Some consequences of a Higgs triplet | Revised version, 25 pages, 4 figures | J.Phys.G36:025002,2009 | 10.1088/0954-3899/36/2/025002 | HRI-P08-02-003, HRI-RECAPP-08-02, CU-PHYSICS/02-2008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an extension of the scalar sector of the Standard Model with a
single complex Higgs triplet $X$. Such extensions are the most economic,
model-independent way of generating neutrino masses through triplet
interactions. We show that a term like $\azero\Phi\Phi X^\dag$ must be included
in the most general potential of such a scenario, in order to avoid a massless
neutral physical scalar. We also demonstrate that $\azero$ must be real, thus
ruling out any additional source of CP-violation. We then examine the
implications of this term in the mass matrices of the singly-and doubly-charged
scalar, neutral scalar and pseudoscalar fields. We find that, for small values
of $\azero/\vtwo$, where $\vtwo$ is the triplet vev, the spectrum allows the
decay of heavier scalars into lighter ones via gauge interactions. For large
$\azero/\vtwo$, the doubly-charged, singly-charged and neutral pseudoscalar
bosons become practically degenerate, while the even-parity neutral scalars
remain considerably lighter, thus emphasizing the possibility of decay of the
singly-charged or neutral pseudoscalar states into the neutral scalars.
Constraints from the $\rho$-parameter are used to find nontrivial limits on the
charged Higgs mass depending on $\azero$. We also study the couplings of the
various physical states in this scenario. For small values of $|\azero|/\vtwo$,
we find the lightest neutral scalar field to be triplet-dominated, and thus
having extremely suppressed interactions with fermion as well as gauge boson
pairs.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 16:24:55 GMT"
},
{
"version": "v2",
"created": "Tue, 30 Dec 2008 12:30:19 GMT"
}
] | "2008-12-30T00:00:00" | [
[
"Dey",
"Paramita",
""
],
[
"Kundu",
"Anirban",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | [
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] |
802.2511 | Marcus Kaiser | Florian Nisbach and Marcus Kaiser | Developmental time windows for spatial growth generate multiple-cluster
small-world networks | null | Eur. Phys. J. B 58, 185-191 (2007) | 10.1140/epjb/e2007-00214-4 | null | physics.soc-ph q-bio.NC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many networks extent in space, may it be metric (e.g. geographic) or
non-metric (ordinal). Spatial network growth, which depends on the distance
between nodes, can generate a wide range of topologies from small-world to
linear scale-free networks. However, networks often lacked multiple clusters or
communities. Multiple clusters can be generated, however, if there are time
windows during development. Time windows ensure that regions of the network
develop connections at different points in time. This novel approach could
generate small-world but not scale-free networks. The resulting topology
depended critically on the overlap of time windows as well as on the position
of pioneer nodes.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 16:30:19 GMT"
}
] | "2008-02-19T00:00:00" | [
[
"Nisbach",
"Florian",
""
],
[
"Kaiser",
"Marcus",
""
]
] | [
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802.2512 | Marcus Kaiser | Marcus Kaiser | Mean clustering coefficients: the role of isolated nodes and leafs on
clustering measures for small-world networks | final version of the manuscript | Marcus Kaiser 2008 New J. Phys. 10 083042 | 10.1088/1367-2630/10/8/083042 | null | physics.soc-ph q-bio.MN | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many networks exhibit the small-world property of the neighborhood
connectivity being higher than in comparable random networks. However, the
standard measure of local neighborhood clustering is typically not defined if a
node has one or no neighbors. In such cases, local clustering has traditionally
been set to zero and this value influenced the global clustering coefficient.
Such a procedure leads to underestimation of the neighborhood clustering in
sparse networks. We propose to include $\theta$ as the proportion of leafs and
isolated nodes to estimate the contribution of these cases and provide a
formula for estimating a clustering coefficient excluding these cases from the
Watts and Strogatz (1998 Nature 393 440-2) definition of the clustering
coefficient. Excluding leafs and isolated nodes leads to values which are up to
140% higher than the traditional values for the observed networks indicating
that neighborhood connectivity is normally underestimated. We find that the
definition of the clustering coefficient has a major effect when comparing
different networks. For metabolic networks of 43 organisms, relations changed
for 58% of the comparisons when a different definition was applied. We also
show that the definition influences small-world features and that the
classification can change from non-small-world to small-world network. We
discuss the use of an alternative measure, disconnectedness D, which is less
influenced by leafs and isolated nodes.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 16:47:38 GMT"
},
{
"version": "v2",
"created": "Sun, 16 Mar 2008 20:01:35 GMT"
},
{
"version": "v3",
"created": "Fri, 29 Aug 2008 17:42:24 GMT"
}
] | "2008-08-30T00:00:00" | [
[
"Kaiser",
"Marcus",
""
]
] | [
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802.2513 | Joachim Kopp | Evgeny Kh. Akhmedov, Joachim Kopp, Manfred Lindner | Oscillations of Mossbauer neutrinos | 31 pages, 2 figures, RevTeX4, minor clarifications in the text,
matches version to be published in JHEP | JHEP0805:005,2008 | 10.1088/1126-6708/2008/05/005 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the probability of recoilless emission and detection of
neutrinos (Mossbauer effect with neutrinos) taking into account the boundedness
of the parent and daughter nuclei in the neutrino source and detector as well
as the leptonic mixing. We show that, in spite of their near monochromaticity,
the recoillessly emitted and captured neutrinos oscillate. After a qualitative
discussion of this issue, we corroborate and extend our results by computing
the combined rate of $\bar{\nu}_e$ production, propagation and detection in the
framework of quantum field theory, starting from first principles. This allows
us to avoid making any a priori assumptions about the energy and momentum of
the intermediate-state neutrino. Our calculation permits quantitative
predictions of the transition rate in future experiments, and shows that the
decoherence and delocalization factors, which could in principle suppress
neutrino oscillations, are irrelevant under realistic experimental conditions.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 17:09:14 GMT"
},
{
"version": "v2",
"created": "Fri, 2 May 2008 09:43:30 GMT"
}
] | "2008-11-26T00:00:00" | [
[
"Akhmedov",
"Evgeny Kh.",
""
],
[
"Kopp",
"Joachim",
""
],
[
"Lindner",
"Manfred",
""
]
] | [
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] |
802.2514 | Kathrin Wimmer | K. Wimmer, V. Bildstein, K. Eppinger, R. Gernh\"auser, D. Habs, Ch.
Hinke, Th. Kr\"oll, R. Kr\"ucken, R. Lutter, H.-J. Maier, P. Maierbeck, Th.
Morgan, O. Schaile, W. Schwerdtfeger, S. Schwertel and P.G. Thirolf | First identification of large electric monopole strength in
well-deformed rare earth nuclei | submitted to Physics Letters B | null | 10.1063/1.3087080 | null | nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Excited states in the well-deformed rare earth isotopes $^{154}$Sm and
$^{166}$Er were populated via ``safe'' Coulomb excitation at the Munich MLL
Tandem accelerator. Conversion electrons were registered in a cooled Si(Li)
detector in conjunction with a magnetic transport and filter system, the
Mini-Orange spectrometer. For the first excited $0^+$ state in $^{154}$Sm at
1099 keV a large value of the monopole strength for the transition to the
ground state of $\rho^2(\text{E0}; 0^+_2 \to 0^+_\text{g}) = 96(42)\cdot
10^{-3}$ could be extracted. This confirms the interpretation of the lowest
excited $0^+$ state in $^{154}$Sm as the collective $\beta$-vibrational
excitation of the ground state. In $^{166}$Er the measured large electric
monopole strength of $\rho^2(\text{E0}; 0^+_4 \to 0^+_1) = 127(60)\cdot
10^{-3}$ clearly identifies the $0_4^+$ state at 1934 keV to be the
$\beta$-vibrational excitation of the ground state.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 16:58:19 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Wimmer",
"K.",
""
],
[
"Bildstein",
"V.",
""
],
[
"Eppinger",
"K.",
""
],
[
"Gernhäuser",
"R.",
""
],
[
"Habs",
"D.",
""
],
[
"Hinke",
"Ch.",
""
],
[
"Kröll",
"Th.",
""
],
[
"Krücken",
"R.",
""
],
[
"Lutter",
"R.",
""
],
[
"Maier",
"H. -J.",
""
],
[
"Maierbeck",
"P.",
""
],
[
"Morgan",
"Th.",
""
],
[
"Schaile",
"O.",
""
],
[
"Schwerdtfeger",
"W.",
""
],
[
"Schwertel",
"S.",
""
],
[
"Thirolf",
"P. G.",
""
]
] | [
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] |
802.2515 | Roberto Decarli | R.Decarli, R.Falomo, J.Kotilainen, M.Labita, R.Scarpa, A.Treves | Re-classification of the alleged quasar Q0045-3337 | Accepted for publication in the Bentham Open Astronomy Journal | Bentham Open Astronomy Journal, 2009, 2 | 10.2174/1874381100902010023 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a medium-resolution optical spectrum of the alleged high-redshift
quasar Q0045-3337, taken at the ESO/3.6m telescope. Our observations show that
the object is not a quasar but a star of spectral type B. We suggest that the
object is either a white dwarf or a halo population Blue Horizontal Branch
star.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 16:58:30 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Mar 2009 13:55:07 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Decarli",
"R.",
""
],
[
"Falomo",
"R.",
""
],
[
"Kotilainen",
"J.",
""
],
[
"Labita",
"M.",
""
],
[
"Scarpa",
"R.",
""
],
[
"Treves",
"A.",
""
]
] | [
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] |
802.2516 | Stefan Kurth | E. Khosravi, S. Kurth, G. Stefanucci, E.K.U. Gross | The Role of Bound States in Time-Dependent Quantum Transport | 10 pages, 8 figures | null | 10.1007/s00339-008-4864-9 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Charge transport through a nanoscale junction coupled to two macroscopic
electrodes is investigated for the situation when bound states are present. We
provide numerical evidence that bound states give rise to persistent,
non-decaying current oscillations in the junction. We also show that the
amplitude of these oscillations can exhibit a strong dependence on the history
of the applied potential as well as on the initial equilibrium configuration.
Our simulations allow for a quantitative investigation of several transient
features. We also discuss the existence of different time-scales and address
their microscopic origin.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 17:02:28 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Khosravi",
"E.",
""
],
[
"Kurth",
"S.",
""
],
[
"Stefanucci",
"G.",
""
],
[
"Gross",
"E. K. U.",
""
]
] | [
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] |
802.2517 | Amos Ron | Ronald DeVore and Amos Ron | Approximation using scattered shifts of a multivariate function | null | null | null | null | math.CA math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The approximation of a general $d$-variate function $f$ by the shifts
$\phi(\cdot-\xi)$, $\xi\in\Xi\subset \Rd$, of a fixed function $\phi$ occurs in
many applications such as data fitting, neural networks, and learning theory.
When $\Xi=h\Z^d$ is a dilate of the integer lattice, there is a rather complete
understanding of the approximation problem \cite{BDR,Johnson1} using Fourier
techniques. However, in most applications the {\it center} set $\Xi$ is either
given, or can be chosen with complete freedom. In both of these cases, the
shift-invariant setting is too restrictive. This paper studies the
approximation problem in the case $\Xi$ is arbitrary. It establishes
approximation theorems whose error bounds reflect the local density of the
points in $\Xi$. Two different settings are analyzed. The first is when the set
$\Xi$ is prescribed in advance. In this case, the theorems of this paper show
that, in analogy with the classical univariate spline approximation, improved
approximation occurs in regions where the density is high. The second setting
corresponds to the problem of non-linear approximation. In that setting the set
$\Xi$ can be chosen using information about the target function $f$. We discuss
how to `best' make these choices and give estimates for the approximation
error.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 18:52:55 GMT"
}
] | "2008-02-19T00:00:00" | [
[
"DeVore",
"Ronald",
""
],
[
"Ron",
"Amos",
""
]
] | [
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] |
802.2518 | Anh-Thu Le | Van-Hoang Le, Ngoc-Ty Nguyen, C. Jin, Anh-Thu Le, C. D. Lin | Retrieval of interatomic separations of molecules from laser-induced
high-order harmonic spectra | 14 pages, 9 figures | J. Phys. B: At. Mol. Opt. Phys. 41, 085603 (2008) | 10.1088/0953-4075/41/8/085603 | null | physics.atom-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We illustrate an iterative method for retrieving the internuclear separations
of N$_2$, O$_2$ and CO$_2$ molecules using the high-order harmonics generated
from these molecules by intense infrared laser pulses. We show that accurate
results can be retrieved with a small set of harmonics and with one or few
alignment angles of the molecules. For linear molecules the internuclear
separations can also be retrieved from harmonics generated using isotropically
distributed molecules. By extracting the transition dipole moment from the
high-order harmonic spectra, we further demonstrated that it is preferable to
retrieve the interatomic separation iteratively by fitting the extracted dipole
moment. Our results show that time-resolved chemical imaging of molecules using
infrared laser pulses with femtosecond temporal resolutions is possible.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 17:19:09 GMT"
}
] | "2008-04-08T00:00:00" | [
[
"Le",
"Van-Hoang",
""
],
[
"Nguyen",
"Ngoc-Ty",
""
],
[
"Jin",
"C.",
""
],
[
"Le",
"Anh-Thu",
""
],
[
"Lin",
"C. D.",
""
]
] | [
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] |
802.2519 | Nikitas Papasimakis | N.I. Zheludev, S.L. Prosvirnin, N. Papasimakis and V.A. Fedotov | Coherent meta-materials and the lasing spaser | null | Nature Photonics 2, 351 - 354 (2008) | 10.1038/nphoton.2008.82 | null | physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2003 Bergman and Stockman introduced the spaser, a quantum amplifier of
surface plasmons by stimulated emission of radiation [1]. They argued that, by
exploiting a metal/dielectric composite medium, it should be possible to
construct a nano-device, where a strong coherent field is built up in a spatial
region much smaller than the wavelength [1,2]. V-shaped metallic inclusion,
combined with a collection of semiconductor quantum dots were discussed as a
possible realization of the spaser [1]. Here we introduce a further development
of the spaser concept. We show that by combining the metamaterial and spaser
ideas one can create a narrow-diversion coherent source of electromagnetic
radiation that is fuelled by plasmonic oscillations. We argue that
two-dimensional arrays of a certain class of plasmonic resonators supporting
high-Q coherent current excitations provide an intriguing opportunity to create
spatially and temporally coherent laser source, the Lasing Spaser.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 17:37:34 GMT"
}
] | "2010-09-03T00:00:00" | [
[
"Zheludev",
"N. I.",
""
],
[
"Prosvirnin",
"S. L.",
""
],
[
"Papasimakis",
"N.",
""
],
[
"Fedotov",
"V. A.",
""
]
] | [
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] |
802.252 | Pablo Laguna | M. C. Washik, J. Healy, F. Herrmann, I. Hinder, D. M. Shoemaker, P.
Laguna, R. A. Matzner | Binary Black Hole Encounters, Gravitational Bursts and Maximum Final
Spin | Replaced with version to appear in PRL | Phys.Rev.Lett.101:061102,2008 | 10.1103/PhysRevLett.101.061102 | null | gr-qc astro-ph | http://creativecommons.org/licenses/by/3.0/ | The spin of the final black hole in the coalescence of nonspinning black
holes is determined by the ``residual'' orbital angular momentum of the binary.
This residual momentum consists of the orbital angular momentum that the binary
is not able to shed in the process of merging. We study the angular momentum
radiated, the spin of the final black hole and the gravitational bursts in a
series of orbits ranging from almost direct infall to numerous orbits before
infall that exhibit multiple bursts of radiation in the merger process. We show
that the final black hole gets a maximum spin parameter $a/M_h \le 0.78$, and
this maximum occurs for initial orbital angular momentum $L \approx M^2_h$.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 17:24:58 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jul 2008 14:38:59 GMT"
}
] | "2008-11-26T00:00:00" | [
[
"Washik",
"M. C.",
""
],
[
"Healy",
"J.",
""
],
[
"Herrmann",
"F.",
""
],
[
"Hinder",
"I.",
""
],
[
"Shoemaker",
"D. M.",
""
],
[
"Laguna",
"P.",
""
],
[
"Matzner",
"R. A.",
""
]
] | [
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] |
802.2521 | Fangwei Ye | Fangwei Ye, Yaroslav V. Kartashov, and Lluis Torner | Nonlocal surface dipoles and vortices | 20 pages, 5 figures, to appear in Phys. Rev. A | Phys. Rev. A 77, 033829 (2008) | 10.1103/PhysRevA.77.033829 | null | nlin.PS nlin.SI physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We predict the existence and address the stability of two-dimensional surface
solitons featuring topologically complex shapes, including dipoles, vortices,
and bound states of vortex solitons, at the interface of nonlocal thermal
media. Unlike their counterparts in bulk media, surface dipoles are found to be
stable in the entire existence domain. Surface vortices are found to exhibit
strongly asymmetric intensity and phase distributions, and are shown to be
stable, too. Bound states of surface vortex solitons belong to a novel class of
surface solitons having no counterparts in bulk media. Such states are found to
be stable provided that their energy flow does not exceed an upper threshold.
Our findings constitute the first known example of topologically complex
solitons located at nonlocal two-dimensional interfaces.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 17:28:48 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Ye",
"Fangwei",
""
],
[
"Kartashov",
"Yaroslav V.",
""
],
[
"Torner",
"Lluis",
""
]
] | [
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802.2522 | Marian Douspis | Alexandre Refregier and the DUNE collaboration | The Dark UNiverse Explorer (DUNE): Proposal to ESA's Cosmic Vision | Accepted in Experimental Astronomy | Exper.Astron.23:17-37,2009 | 10.1007/s10686-008-9106-9 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Dark UNiverse Explorer (DUNE) is a wide-field space imager whose primary
goal is the study of dark energy and dark matter with unprecedented precision.
For this purpose, DUNE is optimised for the measurement of weak gravitational
lensing but will also provide complementary measurements of baryonic accoustic
oscillations, cluster counts and the Integrated Sachs Wolfe effect. Immediate
auxiliary goals concern the evolution of galaxies, to be studied with
unequalled statistical power, the detailed structure of the Milky Way and
nearby galaxies, and the demographics of Earth-mass planets. DUNE is an
Medium-class mission which makes use of readily available components, heritage
from other missions, and synergy with ground based facilities to minimise cost
and risks. The payload consists of a 1.2m telescope with a combined visible/NIR
field-of-view of 1 deg^2. DUNE will carry out an all-sky survey, ranging from
550 to 1600nm, in one visible and three NIR bands which will form a unique
legacy for astronomy. DUNE will yield major advances in a broad range of fields
in astrophysics including fundamental cosmology, galaxy evolution, and
extrasolar planet search. DUNE was recently selected by ESA as one of the
mission concepts to be studied in its Cosmic Vision programme.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 17:39:24 GMT"
},
{
"version": "v2",
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},
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"version": "v3",
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},
{
"version": "v4",
"created": "Thu, 24 Jul 2008 09:01:20 GMT"
}
] | "2011-07-08T00:00:00" | [
[
"Refregier",
"Alexandre",
""
],
[
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"the DUNE",
""
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802.2523 | Christian Corda | Christian Corda | An oscillating Universe from the linearized R^{2} theory of gravity | To appear in General Relativity and Gravitation DOI:
10.1007/s10714-008-0627-3 | Gen.Rel.Grav.40:2201-2212,2008 | 10.1007/s10714-008-0627-3 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An oscillating Universe which arises from the linearized R^{2} theory of
gravity is discussed, showing that some observative evidences like the
cosmological redshift and the Hubble law are in agreement with the model. In
this context Dark Energy is seen like a pure curvature effect arising by the
Ricci scalar.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 17:39:59 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 10:24:05 GMT"
}
] | "2009-06-23T00:00:00" | [
[
"Corda",
"Christian",
""
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802.2524 | Sergei Zharkov Dr | S.Zharkov, C.Nicholas, M.J.Thompson | Time Distance Study of Isolated Sunspots | 5 pages, 5 figures | Astron.Nachr.328:240-244, 2007 | 10.1002/asna.200610744 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a comparative seismic study of conditions around and beneath
isolated sunspots. Using the European Grid of Solar Observations' Solar Feature
Catalogue of sunspots derived from SOHO/MDI continuum and magnetogram data,
1996-2005, we identify a set of isolated sunspots by checking that within a
Carrington Rotation there were no other spots detected in the vicinity. We then
use level-2 tracked MDI Dopplergrams available from SOHO website to investigate
wave-speed perturbations of such sunspots using time-distance helioseismology.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 18:01:22 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Zharkov",
"S.",
""
],
[
"Nicholas",
"C.",
""
],
[
"Thompson",
"M. J.",
""
]
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] |
802.2525 | Pol Bernard Gossiaux | P.B. Gossiaux and J. Aichelin | Towards an understanding of the RHIC single electron data | Accepted for publication in Physical Review C | Phys.Rev.C78:014904,2008 | 10.1103/PhysRevC.78.014904 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High transverse momentum ($p_T$) single non-photonic electrons which have
been measured in the RHIC experiments come dominantly from heavy meson decay.
The ratio of their $p_T$ spectra in pp and AA collisions ($R_{AA}(p_T)$)
reveals the energy loss of heavy quarks in the environment created by AA
collisions. Using a fixed coupling constant and the Debye mass ($m_D\approx
gT$) as infrared regulator perturbative QCD (pQCD) calculations are not able to
reproduce the data, neither the energy loss nor the azimuthal $(v_2)$
distribution. Employing a running coupling constant and replacing the Debye
mass by a more realistic hard thermal loop (HTL) calculation we find a
substantial increase of the collisional energy loss which brings the $v_2(p_T)$
distribution as well as $R_{AA}(p_T)$ to values close to the experimental ones
without excluding a contribution from radiative energy loss.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 18:08:27 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Jun 2008 09:50:06 GMT"
}
] | "2008-11-07T00:00:00" | [
[
"Gossiaux",
"P. B.",
""
],
[
"Aichelin",
"J.",
""
]
] | [
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802.2526 | Paul Smolen | Paul Smolen, Douglas A. Baxter, John H. Byrne | Bistable MAP Kinase Activity: A Plausible Mechanism Contributing to
Maintenance of Late Long-Term Potentiation | 33 pages. 7 figures are at end | Am J Physiol Cell Physiol. 2008; v294, C503-C515 | null | null | q-bio.MN q-bio.NC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bistability of MAP kinase (MAPK) activity has been suggested to contribute to
several cellular processes, including differentiation and long-term synaptic
potentiation. A recent model (48) predicts bistability due to interactions of
the kinases and phosphatases in the MAPK pathway, without feedback from MAPK to
earlier reactions. Using this model and enzyme concentrations appropriate for
neurons, we simulated bistable MAPK activity, but bistability only was present
within a relatively narrow range of activity of Raf, the first pathway kinase.
Stochastic fluctuations in molecule numbers eliminated bistability for small
molecule numbers, such as are expected in the volume of a dendritic spine.
However, positive feedback loops have been posited from MAPK up to Raf
activation. One proposed loop in which MAPK directly activates Raf was
incorporated into the model. We found that such feedback greatly enhanced the
robustness of both stable states of MAPK activity to stochastic fluctuations
and to parameter variations. Bistability was robust for molecule numbers
plausible for a dendritic spine volume. The upper state of MAPK activity was
resistant to inhibition of MEK activation for > 1 h, suggesting inhibitor
experiments have not sufficed to rule out a role for persistent MAPK activity
in LTP maintenance. These simulations suggest that persistent MAPK activity and
consequent upregulation of translation may contribute to LTP maintenance and to
long-term memory. Experiments using a fluorescent MAPK substrate may further
test this hypothesis.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 19:15:25 GMT"
}
] | "2008-02-19T00:00:00" | [
[
"Smolen",
"Paul",
""
],
[
"Baxter",
"Douglas A.",
""
],
[
"Byrne",
"John H.",
""
]
] | [
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802.2527 | Abhay Ashtekar | Abhay Ashtekar, Jonathan Engle and David Sloan | Asymptotics and Hamiltonians in a First order formalism | 18 pages, No figures. Added a footnote 2 and two references | Class.Quant.Grav.25:095020,2008 | 10.1088/0264-9381/25/9/095020 | IGC-08/02-4 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider 4-dimensional space-times which are asymptotically flat at
spatial infinity and show that, in the first order framework, action principle
for general relativity is well-defined \emph{without the need of infinite
counter terms.} It naturally leads to a covariant phase space in which the
Hamiltonians generating asymptotic symmetries provide the total energy-momentum
and angular momentum of the space-time. We address the subtle but important
problems that arise because of logarithmic translations and super-translations
both in the Langrangian and Hamiltonian frameworks. As a forthcoming paper will
show, the treatment of higher dimensions is considerably simpler. Our first
order framework also suggests a new direction for generalizing the spectral
action of non-commutative geometry.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 20:00:06 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 21:11:31 GMT"
}
] | "2008-11-26T00:00:00" | [
[
"Ashtekar",
"Abhay",
""
],
[
"Engle",
"Jonathan",
""
],
[
"Sloan",
"David",
""
]
] | [
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] |
802.2528 | Nitish Korula | Chandra Chekuri, Nitish Korula | Min-Cost 2-Connected Subgraphs With k Terminals | 18 pages, 3 figures | null | null | null | cs.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the k-2VC problem, we are given an undirected graph G with edge costs and
an integer k; the goal is to find a minimum-cost 2-vertex-connected subgraph of
G containing at least k vertices. A slightly more general version is obtained
if the input also specifies a subset S \subseteq V of terminals and the goal is
to find a subgraph containing at least k terminals. Closely related to the
k-2VC problem, and in fact a special case of it, is the k-2EC problem, in which
the goal is to find a minimum-cost 2-edge-connected subgraph containing k
vertices. The k-2EC problem was introduced by Lau et al., who also gave a
poly-logarithmic approximation for it. No previous approximation algorithm was
known for the more general k-2VC problem. We describe an O(\log n \log k)
approximation for the k-2VC problem.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 18:34:28 GMT"
}
] | "2008-02-19T00:00:00" | [
[
"Chekuri",
"Chandra",
""
],
[
"Korula",
"Nitish",
""
]
] | [
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] |
802.2529 | Juergen Horbach | Ali Kerrache (University of Mainz), Juergen Horbach (German Aerospace
Center, Koeln), and Kurt Binder (University of Mainz) | Molecular Dynamics Computer Simulation of Crystal Growth and Melting in
Al50Ni50 | 6 pages, 6 figures | Europhys. Lett. 81, 58001 (2008) | 10.1209/0295-5075/81/58001 | null | cond-mat.mtrl-sci cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The melting and crystallization of Al50Ni50} are studied by means of
molecular dynamics computer simulations, using a potential of the embedded atom
type to model the interactions between the particles. Systems in a slab
geometry are simulated where the B2 phase of AlNi in the middle of an elongated
simulation box is separated by two planar interfaces from the liquid phase,
thereby considering the (100) crystal orientation. By determining the
temperature dependence of the interface velocity, an accurate estimate of the
melting temperature is provided. The value k=0.0025 m/s/K for the kinetic
growth coefficient is found. This value is about two orders of magnitude
smaller than that found in recent simulation studies of one-component metals.
The classical Wilson-Frenkel model is not able to describe the crystal growth
kinetics on a quantitative level. We argue that this is due to the neglect of
diffusion processes in the liquid-crystal interface.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 18:41:54 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Kerrache",
"Ali",
"",
"University of Mainz"
],
[
"Horbach",
"Juergen",
"",
"German Aerospace\n Center, Koeln"
],
[
"Binder",
"Kurt",
"",
"University of Mainz"
]
] | [
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] |
802.253 | Zhi-Hui Guo | Zhi-Hui Guo | Resonance sum rules from large $N_C$ and partial wave dispersive
analysis | 4 pages, contribution to the Workshop on "Scalar meson and Related
topics" (Scadron 70), during Feb 11-16, 2008, at IST, Lisbon, Portugal | null | 10.1063/1.2973540 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Combining large $N_C$ techniques and partial wave dispersion theory to
analyze the $\pi\pi$ scattering, without relying on any explicit resonance
lagrangian, some interesting results are derived: (a) a general KSRF relation
including the scalar meson contribution; (b) a new relation between resonance
couplings, with which we have made an intensive analysis in several specific
models; (c) low energy constants in chiral perturbation theory related with
$\pi\pi$ scattering in terms of the mass and decay width of resonances.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 18:45:51 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Guo",
"Zhi-Hui",
""
]
] | [
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802.2531 | Iosif Galanakis | I. Galanakis, K. Ozdogan and E. Sasioglu | Ab-initio determined electronic and magnetic properties of half-metallic
NiCrSi and NiMnSi Heusler alloys; the role of interfaces and defects | null | Journal of Applied Physics 104, 083916 (2008) | 10.1063/1.3005882 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using state-of-the-art first-principles calculations we study the properties
of the ferromagnetic Heusler compounds NiYSi where Y stands for V, Cr or Mn.
NiCrSi and NiMnSi contrary to NiVSi are half-metallic at their equilibrium
lattice constant exhibiting integer values of the total spin magnetic moment
and thus we concentrate on these two alloys. The minority-spin gap has the same
characteristics as for the well-known NiMnSb alloy being around $\sim$1 eV.
Upon tetragonalization the gap is present in the density of states even for
expansion or contraction of the out-of-plane lattice parameter by 5%. The Cr-Cr
and Mn-Mn interactions make ferromagnetism extremely stable and the Curie
temperature exceeds 1000 K for NiMnSi. Surface and interfaces with GaP, ZnS and
Si semiconductors are not half-metallic but in the case of NiCrSi the Ni-based
contacts present spin-polarization at the Fermi level over 90%. Finally, we
show that there are two cases of defects and atomic-swaps. The first-ones which
involve the Cr(Mn) and Si atoms induce states at the edges of the gap which
persists for a moderate-concentration of defects. Defects involving Ni atoms
induce states localized within the gap completely destroying the
half-metallicity. Based on single-impurity calculations we associate these
states to the symmetry of the crystal.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 19:07:55 GMT"
}
] | "2011-01-28T00:00:00" | [
[
"Galanakis",
"I.",
""
],
[
"Ozdogan",
"K.",
""
],
[
"Sasioglu",
"E.",
""
]
] | [
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802.2532 | Antonaldo Diaferio | A. Diaferio | The evidence for unusual gravity from the large-scale structure of the
Universe | Invited review to appear in the Proceedings of the 1st AFI symposium
"From the Vacuum to the Universe", Innsbruck, Austria, October 2007, to be
published by the Innsbruck University Press, ed. by S.D. Bass, F. Schallhart
and B. Tasser | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under the assumption that General Relativity (GR) correctly describes the
phenomenology of our Universe, astronomical observations provide compelling
evidence that (1) the dynamics of cosmic structure is dominated by dark matter
(DM), an exotic matter mostly made of hypothetical elementary particles, and
(2) the expansion of the Universe is currently accelerating because of the
presence of a positive cosmological constant Lambda. The DM particles have not
yet been detected and there is no theoretical justification for the tiny
positive Lambda implied by observations. Therefore, over the last decade, the
search for extended or alternative theories of gravity has flourished.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 19:27:34 GMT"
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] | "2008-02-19T00:00:00" | [
[
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"A.",
""
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802.2533 | Steve Fisk | Steve Fisk | Coloring the 600 Cell | 4 pages | null | null | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 600 cell S has exactly 10 5-colorings. From these colorings we can
construct the space of colorings $B(S)$. This complex has 1344 colorings, and
is isomorphic to the space of 5 by 5 Latin Squares. These simplices split into
4 copies of a quotient of S by an involution, and two copies of a space made up
of even Latin Squares.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 19:12:13 GMT"
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] | "2008-02-19T00:00:00" | [
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] |
802.2534 | Roya Mohayaee | Roya Mohayaee, Jacques Colin | Dark matter accretion wakes of high-redshift black holes | Talk presented at "Jean-Pierre Lasota, X-ray binaries, accretion
disks and compact stars" (October 2007); Abramowicz, M. Ed., New Astronomy
Review, in press | New Astron.Rev.51:898-905,2008 | 10.1016/j.newar.2008.03.022 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anisotropic emission of gravitational waves during the merger or formation of
black holes can lead to the ejection of these black holes from their host
galaxies. A recoiled black hole which moves on an almost radial bound orbit
outside the virial radius of its central galaxy, in the cold dark matter
background, reaches its apapsis in a finite time. The low value of dark matter
velocity dispersion at high redshifts and also the black hole velocity near the
apapsis passage yield a high-density wake around these black holes. Gamma-ray
emission can result from the enhancement of dark matter annihilation in these
wakes. The diffuse high-energy gamma-ray background from the ensemble of such
black holes in the Hubble volume is also evaluated.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 20:11:39 GMT"
}
] | "2009-06-23T00:00:00" | [
[
"Mohayaee",
"Roya",
""
],
[
"Colin",
"Jacques",
""
]
] | [
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] |
802.2535 | Ryan Porter | G.J. Ferland, A.C. Fabian, N.A. Hatch, R.M. Johnstone, R.L. Porter,
P.A.M. van Hoof, R.J.R. Williams | The origin of molecular hydrogen emission in cooling-flow filaments | 5 pages, 4 figures, accepted to MNRAS Letters | null | 10.1111/j.1745-3933.2008.00463.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The optical filaments found in many cooling flows in galaxy clusters consist
of low density ($\sim 10^3 \pcc$) cool ($\sim 10^3$ K) gas surrounded by
significant amounts of cosmic-ray and magnetic-field energy. Their spectra show
anomalously strong low-ionization and molecular emission lines when compared
with galactic molecular clouds exposed to ionizing radiation such as the Orion
complex. Previous studies have shown that the spectra cannot be produced by
O-star photoionization. Here we calculate the physical conditions in dusty gas
that is well shielded from external sources of ionizing photons and is
energized either by cosmic rays or dissipative MHD waves. Strong molecular
hydrogen lines, with relative intensities similar to those observed, are
produced. Selection effects introduced by the microphysics produce a
correlation between the \htwo line upper level energy and the population
temperature. These selection effects allow a purely collisional gas to produce
\htwo emission that masquerades as starlight-pumped \htwo but with intensities
that are far stronger. This physics may find application to any environment
where a broad range of gas densities or heating rates occur.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 20:41:01 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Ferland",
"G. J.",
""
],
[
"Fabian",
"A. C.",
""
],
[
"Hatch",
"N. A.",
""
],
[
"Johnstone",
"R. M.",
""
],
[
"Porter",
"R. L.",
""
],
[
"van Hoof",
"P. A. M.",
""
],
[
"Williams",
"R. J. R.",
""
]
] | [
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802.2536 | Luis Gonzalez-Mestres | Luis Gonzalez-Mestres | Lorentz symmetry violation and the results of the AUGER experiment | Two sections added. 12 pages, LaTex | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly discuss the implications of recent AUGER results for patterns of
Lorentz symmetry violation (LSV), assuming that the existence of the
Greisen-Zatsepin-Kuzmin cutoff is definitely confirmed. The mass composition of
the highest-energy cosmic-ray spectrum is a crucial issue. In any case, the new
data allow in principle to exclude a significant range of LSV models but leave
open several important possibilities : a weaker Lorentz breaking, a fundamental
scale beyond the Planck scale, scenarios with threshold effects... It may even
happen that spontaneous decays due to LSV fake the GZK cutoff. Space
experiments appear to be needed to further test special relativity. We also
comment on the consequences of AUGER data for superbradyons. If such particles
are present in the Universe, they may provide new forms of dark matter and dark
energy.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 19:56:22 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 20:26:47 GMT"
},
{
"version": "v3",
"created": "Mon, 16 Jun 2008 18:49:31 GMT"
}
] | "2008-06-16T00:00:00" | [
[
"Gonzalez-Mestres",
"Luis",
""
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802.2537 | Louis Marchildon | Louis Marchildon | On relativistic elements of reality | Clarifications, reference added; published version | Foundations of Physics 38 (2008) 804-17 | 10.1007/s10701-008-9238-9 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several arguments have been proposed some years ago, attempting to prove the
impossibility of defining Lorentz-invariant elements of reality. I find that a
sufficient condition for the existence of elements of reality, introduced in
these proofs, seems to be used also as a necessary condition. I argue that
Lorentz-invariant elements of reality can be defined but, as Vaidman pointed
out, they won't satisfy the so-called product rule. In so doing I obtain
algebraic constraints on elements of reality associated with a maximal set of
commuting Hermitian operators.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 20:25:41 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Oct 2008 11:48:36 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Marchildon",
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""
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802.2538 | Mladen Georgiev | Mladen Georgiev | Note on the oblate and prolate deformations in nuclear matter from the
viewpoint of the quantum-mechanical off-center effect | 7 pages including 1 figure, all pdf format | null | null | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility that a quantum-mechanical off-center effect may
be behind the deformed oblate and prolate shapes of nuclei in nuclear physics.
In solid state physics, finite off-center displacements result from the mixing
of electronic states through their coupling to vibrational (phonon) modes of
appropriate symmetries. This is an example of fermion-boson interaction which
may materialize in nuclear physics as well in the form of a coupling of
nucleons to the pi-meson field. We carry out calculations to substantiate the
proposal.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 20:27:26 GMT"
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] | "2008-02-19T00:00:00" | [
[
"Georgiev",
"Mladen",
""
]
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802.2539 | Songxue Chi | Songxue Chi, Pengcheng Dai, T. Barnes, H. J. Kang, J. W. Lynn, R.
Bewley, F. Ye, M. B. Maple, Z. Henkie, and A. Pietraszko | Inelastic neutron scattering studies of Crystal Field Levels in
PrOs$_4$As$_{12}$ | 7 pages, 7 figures | Phys. Rev. B 77, 094428 (2008) | 10.1103/PhysRevB.77.094428 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use neutron scattering to study the Pr$^{3+}$ crystalline electric field
(CEF) excitations in the filled skutterudite PrOs$_4$As$_{12}$. By comparing
the observed levels and their strengths under neutron excitation with the
theoretical spectrum and neutron excitation intensities, we identify the
Pr$^{3+}$ CEF levels, and show that the ground state is a magnetic
$\Gamma_4^{(2)}$ triplet, and the excited states $\Gamma_1$, $\Gamma_4^{(1)}$
and $\Gamma_{23}$ are at 0.4, 13 and 23 meV, respectively. A comparison of the
observed CEF levels in PrOs$_4$As$_{12}$ with the heavy fermion superconductor
PrOs$_4$Sb$_{12}$ reveals the microscopic origin of the differences in the
ground states of these two filled skutterudites.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 00:12:13 GMT"
}
] | "2008-10-22T00:00:00" | [
[
"Chi",
"Songxue",
""
],
[
"Dai",
"Pengcheng",
""
],
[
"Barnes",
"T.",
""
],
[
"Kang",
"H. J.",
""
],
[
"Lynn",
"J. W.",
""
],
[
"Bewley",
"R.",
""
],
[
"Ye",
"F.",
""
],
[
"Maple",
"M. B.",
""
],
[
"Henkie",
"Z.",
""
],
[
"Pietraszko",
"A.",
""
]
] | [
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802.254 | Tilo Waldenmaier | Tilo Waldenmaier | IceTop - Cosmic Ray Physics with IceCube | 4 pages, 6 figures. Talk at Roma International Conference on
Astroparticle Physics, June 2007 | Nucl.Instrum.Meth.A588:130-134,2008 | 10.1016/j.nima.2008.01.015 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The IceCube experiment at South Pole consists of two detector components -
the IceTop air shower array on the surface and the neutrino telescope at depths
from 1450 m to 2450 m below. Currently, 26 IceTop stations and 22 InIce strings
are deployed. With the present size of the IceTop array, it is possible to
measure cosmic rays with energies ranging from 0.5 to 100 PeV. Coincident
events between the IceTop and the InIce detector provide useful cross-checks of
the detector performance and furthermore make it possible to study the
cosmic-ray composition. This paper gives an overview on the current status of
IceTop.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 00:21:25 GMT"
}
] | "2009-06-23T00:00:00" | [
[
"Waldenmaier",
"Tilo",
""
]
] | [
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802.2541 | Romain Tessera | Romain Tessera | Coarse embeddings into a Hilbert space, Haagerup Property and Poincare
inequalities | 14 pages | null | null | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that a metric space does not coarsely embed into a Hilbert space if
and only if it satisfies a sequence of Poincar\'e inequalities, which can be
formulated in terms of (generalized) expanders. We also give quantitative
statements, relative to the compression. In the equivariant context, our result
says that a group does not have the Haagerup property if and only if it has
relative property T with respect to a family of probabilities whose supports go
to infinity. We give versions of this result both in terms of unitary
representations, and in terms of affine isometric actions on Hilbert spaces.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 00:27:14 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Mar 2008 20:56:44 GMT"
}
] | "2008-03-11T00:00:00" | [
[
"Tessera",
"Romain",
""
]
] | [
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] |
802.2542 | Kimball A. Milton | I. Brevik and K. A. Milton | Casimir Energies: Temperature Dependence, Dispersion, and Anomalies | 15 pages, no figures; slight revision of discussion | Phys.Rev.E78:011124,2008 | 10.1103/PhysRevE.78.011124 | null | quant-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming the conventional Casimir setting with two thick parallel perfectly
conducting plates of large extent with a homogeneous and isotropic medium
between them, we discuss the physical meaning of the electromagnetic field
energy $W_{\rm disp}$ when the intervening medium is weakly dispersive but
nondissipative. The presence of dispersion means that the energy density
contains terms of the form $d[\omega\epsilon(\omega)] /d\omega$ and
$d[\omega\mu(\omega)] /d\omega$. We find that, as $W_{\rm disp}$ refers
thermodynamically to a non-closed physical system, it is {\it not} to be
identified with the internal thermodynamic energy $U$ following from the free
energy $F$, or the electromagnetic energy $W$, when the last-mentioned
quantities are calculated without such dispersive derivatives. To arrive at
this conclusion, we adopt a model in which the system is a capacitor, linked to
an external self-inductance $L$ such that stationary oscillations become
possible. Therewith the model system becomes a non-closed one. As an
introductory step, we review the meaning of the nondispersive energies, $F, U,$
and $W$. As a final topic, we consider an anomaly connected with local surface
divergences encountered in Casimir energy calculations for higher spacetime
dimensions, $D>4$, and discuss briefly its dispersive generalization. This kind
of application is essentially a generalization of the treatment of Alnes {\it
et al.} [J. Phys. A: Math. Theor. {\bf 40}, F315 (2007)] to the case of a
medium-filled cavity between two hyperplanes.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:49:28 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 22:45:53 GMT"
},
{
"version": "v3",
"created": "Tue, 17 Jun 2008 18:01:04 GMT"
}
] | "2008-11-26T00:00:00" | [
[
"Brevik",
"I.",
""
],
[
"Milton",
"K. A.",
""
]
] | [
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802.2543 | Novella Bartolini | Novella Bartolini, Giancarlo Bongiovanni, Simone Silvestri (Department
of Computer Science University of Rome Sapienza, Italy) | Self-* overload control for distributed web systems | The full version of this paper, titled "Self-* through self-learning:
overload control for distributed web systems", has been published on Computer
Networks, Elsevier. The simulator used for the evaluation of the proposed
algorithm is available for download at the address:
http://www.dsi.uniroma1.it/~novella/qos_web/ | null | null | null | cs.NI cs.PF | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unexpected increases in demand and most of all flash crowds are considered
the bane of every web application as they may cause intolerable delays or even
service unavailability. Proper quality of service policies must guarantee rapid
reactivity and responsiveness even in such critical situations. Previous
solutions fail to meet common performance requirements when the system has to
face sudden and unpredictable surges of traffic. Indeed they often rely on a
proper setting of key parameters which requires laborious manual tuning,
preventing a fast adaptation of the control policies. We contribute an original
Self-* Overload Control (SOC) policy. This allows the system to self-configure
a dynamic constraint on the rate of admitted sessions in order to respect
service level agreements and maximize the resource utilization at the same
time. Our policy does not require any prior information on the incoming traffic
or manual configuration of key parameters. We ran extensive simulations under a
wide range of operating conditions, showing that SOC rapidly adapts to time
varying traffic and self-optimizes the resource utilization. It admits as many
new sessions as possible in observance of the agreements, even under intense
workload variations. We compared our algorithm to previously proposed
approaches highlighting a more stable behavior and a better performance.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:18:17 GMT"
},
{
"version": "v2",
"created": "Thu, 29 Jan 2009 15:14:20 GMT"
}
] | "2009-01-29T00:00:00" | [
[
"Bartolini",
"Novella",
"",
"Department\n of Computer Science University of Rome Sapienza, Italy"
],
[
"Bongiovanni",
"Giancarlo",
"",
"Department\n of Computer Science University of Rome Sapienza, Italy"
],
[
"Silvestri",
"Simone",
"",
"Department\n of Computer Science University of Rome Sapienza, Italy"
]
] | [
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802.2544 | Cynthia Will | Cynthia E. Will | A curve of nilpotent Lie algebras which are not Einstein nilradicals | 10 pages | null | null | null | math.DG math-ph math.MP math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The only known examples of noncompact Einstein homogeneous spaces are
standard solvmanifolds (special solvable Lie groups endowed with a left
invariant metric), and according to a long standing conjecture, they might be
all. The classification of Einstein solvmanifolds is equivalent to the one of
Einstein nilradicals, i.e. nilpotent Lie algebras which are nilradicals of the
Lie algebras of Einstein solvmanifolds. Up to now, there have been found very
few examples of graded nilpotent Lie algebras that can not be Einstein
nilradicals. In particular, in each dimension, there are only finitely many
known. We exhibit in the present paper two curves of pairwise non-isomorphic
9-dimensional 2-step nilpotent Lie algebras which are not Einstein nilradicals.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:00:11 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Will",
"Cynthia E.",
""
]
] | [
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] |
802.2545 | Isabelle Dicaire | I. Dicaire (1), C. Carignan (1), P. Amram (2), M. Marcelin (2), J.
Hlavacek-Larrondo (1), M.-M. de Denus-Baillargeon (1), O. Daigle (1,2) and O.
Hernandez (1) ((1) Universit\'e de Montr\'eal, (2) LAM-Marseille) | Deep Fabry-Perot Halpha Observations of NGC 7793: a Very Extended Halpha
Disk and a Truly Declining Rotation Curve | 28 pages, 8 figures. Accepted for publication in AJ | null | 10.1088/0004-6256/135/6/2038 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Deep Halpha observations of the Sculptor Group galaxy NGC 7793 were obtained
on the ESO 3.60m and the Marseille 36cm telescopes at La Silla, Chile. Halpha
emission is detected all the way to the edge of the HI disk, making of the HII
disk of NGC 7793 one of the largest ever observed in a quiet non-AGN late-type
system. Even in the very outer parts, the HII ionizing sources are probably
mainly internal (massive stars in the disk) with an unlikely contribution from
the extragalactic ionizing background. The Halpha kinematics confirms what had
already been seen with the HI observations: NGC 7793 has a truly declining
rotation curve. However, the decline is not Keplerian and a dark halo is still
needed to explain the rotation velocities in the outer parts.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:00:31 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Dicaire",
"I.",
"",
"Université de Montréal"
],
[
"Carignan",
"C.",
"",
"Université de Montréal"
],
[
"Amram",
"P.",
"",
"LAM-Marseille"
],
[
"Marcelin",
"M.",
"",
"LAM-Marseille"
],
[
"Hlavacek-Larrondo",
"J.",
"",
"Université de Montréal"
],
[
"de Denus-Baillargeon",
"M. -M.",
"",
"Université de Montréal"
],
[
"Daigle",
"O.",
"",
"Université de Montréal",
"LAM-Marseille"
],
[
"Hernandez",
"O.",
"",
"Université de Montréal"
]
] | [
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] |
802.2546 | Igor Herbut | Igor F. Herbut and Bitan Roy | Quantum critical scaling in magnetic field near the Dirac point in
graphene | 5 RevTex pages, 3 figures; added comments and references; cosmetic
changes (this, published, version) | Phys. Rev. B vol. 77, 245438 (2008) | 10.1103/PhysRevB.77.245438 | null | cond-mat.mes-hall cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent measurement of the activation energy at the quantum
Hall state at the filling factor f=1 in graphene we discuss the scaling of the
interaction-induced gaps in vicinity of the Dirac point with the magnetic
field. The gap at f=1 is shown to be bounded from above by E(1)/C, where E(n)
are the Landau level energies and C = 5.985 + O(1/N) is a universal number. The
universal scaling functions are computed exactly for a large number of Dirac
fermions N. We find a sublinear dependence of the gap at the laboratory
magnetic fields for realistic values of short-range repulsion between
electrons, and in quantitative agreement with observation.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:00:37 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Apr 2008 21:51:09 GMT"
},
{
"version": "v3",
"created": "Sun, 29 Jun 2008 09:41:16 GMT"
}
] | "2009-05-20T00:00:00" | [
[
"Herbut",
"Igor F.",
""
],
[
"Roy",
"Bitan",
""
]
] | [
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] |
802.2547 | Rene Fassbender | R. Fassbender, H. Boehringer, G. Lamer, C.R. Mullis, P. Rosati, A.
Schwope, J. Kohnert, J.S. Santos | Indications for 3 Mpc-scale large-scale structure associated with an
X-ray luminous cluster of galaxies at z=0.95 | 5 pages, 4 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20079001 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | X-ray luminous clusters of galaxies at z~1 are emerging as major cosmological
probes and are fundamental tools to study the cosmic large-scale structure and
environmental effects of galaxy evolution at large look-back times. We present
details of the newly-discovered galaxy cluster XMMU J0104.4-0630 at z=0.947 and
a probable associated system in the LSS environment. The clusters were found in
a systematic study for high-redshift systems using deep archival XMM-Newton
data for the serendipitous detection and the X-ray analysis, complemented by
optical/NIR imaging observations and spectroscopy of the main cluster. We find
a well-evolved, intermediate luminosity cluster with Lx=(6.4+-1.3)x10^43 erg/s
(0.5-2.0 keV) and strong central 1.4 GHz radio emission. The cluster galaxy
population exhibits a pronounced transition toward bluer colors at
cluster-centric distances of 1-2 core radii, consistent with an age difference
of 1-2 Gyr for a single burst solar metallicity model. The second, less evolved
X-ray cluster at a projected distance of 6.4 arcmin (~3 Mpc) and a concordant
red-sequence color likely forms a cluster-cluster bridge with the main target
as part of its surrounding large-scale structure at z~0.95.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 09:53:12 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Fassbender",
"R.",
""
],
[
"Boehringer",
"H.",
""
],
[
"Lamer",
"G.",
""
],
[
"Mullis",
"C. R.",
""
],
[
"Rosati",
"P.",
""
],
[
"Schwope",
"A.",
""
],
[
"Kohnert",
"J.",
""
],
[
"Santos",
"J. S.",
""
]
] | [
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802.2548 | Asle Sudbo | E. K. Dahl, E. Babaev, S. Kragset, and A. Sudbo | Preemptive vortex-loop proliferation in multicomponent interacting
Bose--Einstein condensates | 12 pages, 10 figures. Submitted to Physical Review B | Phys.Rev.B77:144519,2008 | 10.1103/PhysRevB.77.144519 | null | cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use analytical arguments and large-scale Monte Carlo calculations to
investigate the nature of the phase transitions between distinct complex
superfluid phases in a two-component Bose--Einstein condensate when a
non-dissipative drag between the two components is being varied. We focus on
understanding the role of topological defects in various phase transitions and
develop vortex-matter arguments allowing an analytical description of the phase
diagram. We find the behavior of fluctuation induced vortex matter to be much
more complex and substantially different from that of single-component
superfluids. We propose and investigate numerically a novel drag-induced
``preemptive vortex loop proliferation'' transition. Such a transition may be a
quite generic feature in many multicomponent systems where symmetry is restored
by a gas of several kinds of competing vortex loops.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:01:50 GMT"
}
] | "2008-11-26T00:00:00" | [
[
"Dahl",
"E. K.",
""
],
[
"Babaev",
"E.",
""
],
[
"Kragset",
"S.",
""
],
[
"Sudbo",
"A.",
""
]
] | [
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802.2549 | Sean McGee | D. J. Wilman (1), D. Pierini (1), K. Tyler (2), S. L. McGee (3), A.
Oemler Jr (4), S. L. Morris (5), M. L. Balogh (3), R. G. Bower (5), J. S.
Mulchaey (4) ((1) MPE, Garching, Germany, (2) Steward Observatory, Arizona,
(3) University of Waterloo, Canada, (4) Carnegie Observatories, Pasadena, (5)
University of Durham, U.K.) | Unveiling the Important Role of Groups in the Evolution of Massive
Galaxies: Insights from an Infrared Passive Sequence at Intermediate Redshift | 15 pages, 6 figures. Accepted for publication in ApJ | null | 10.1086/587478 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most massive galaxies in the Universe are also the oldest. To overturn
this apparent contradiction with hierarchical growth models, we focus on the
group scale haloes which host most of these galaxies. A stellar mass selected
M_* >~ 2x10^10M_sol sample at z~0.4 is constructed within the CNOC2 redshift
survey. A sensitive Mid InfraRed (MIR) IRAC colour is used to isolate passive
galaxies. It produces a bimodal distribution, in which passive galaxies
(highlighted by morphological early-types) define a tight MIR colour sequence
(Infrared Passive Sequence, IPS). This is due to stellar atmospheric emission
from old stellar populations. Significantly offset from the IPS are galaxies
where reemission by dust boosts emission at 8microns (InfraRed-Excess or IRE
galaxies). They include all known morphological late-types. Comparison with
EW[OII] shows that MIR colour is highly sensitive to low levels of activity,
and allows us to separate dusty-active from passive galaxies. The fraction of
IRE galaxies, f(IRE) drops with M_*, such that f(IRE)=0.5 at a ``crossover
mass'' of ~1.3x10^11M_sol. Within our optically-defined group sample there is a
strong and consistent deficit in f(IRE) at all masses, and most clearly at M_*
>~10^11M_sol. Using a mock galaxy catalogue derived from the Millenium
Simulation we show that the observed trend of f(IRE) with M_* can be explained
if suppression of star formation occurs primarily in the group environment, and
particularly for M_*>~10^11M_sol galaxies. In this way, downsizing can be
driven solely by structure growth in the Universe.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:03:22 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Wilman",
"D. J.",
""
],
[
"Pierini",
"D.",
""
],
[
"Tyler",
"K.",
""
],
[
"McGee",
"S. L.",
""
],
[
"Oemler",
"A.",
"Jr"
],
[
"Morris",
"S. L.",
""
],
[
"Balogh",
"M. L.",
""
],
[
"Bower",
"R. G.",
""
],
[
"Mulchaey",
"J. S.",
""
]
] | [
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] |
802.255 | Bridget Tenner | Kari Ragnarsson and Bridget Eileen Tenner | Obtainable Sizes of Topologies on Finite Sets | Final version, to appear in Journal of Combinatorial Theory, Series A | null | null | null | math.CO math.GN | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the smallest possible number of points in a topological space having
k open sets. Equivalently, this is the smallest possible number of elements in
a poset having k order ideals. Using efficient algorithms for constructing a
topology with a prescribed size, we show that this number has a logarithmic
upper bound. We deduce that there exists a topology on n points having k open
sets, for all k in an interval which is exponentially large in n. The
construction algorithms can be modified to produce topologies where the
smallest neighborhood of each point has a minimal size, and we give a range of
obtainable sizes for such topologies.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:13:48 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 14:53:45 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Oct 2008 20:01:29 GMT"
},
{
"version": "v4",
"created": "Wed, 20 May 2009 19:20:27 GMT"
}
] | "2009-05-20T00:00:00" | [
[
"Ragnarsson",
"Kari",
""
],
[
"Tenner",
"Bridget Eileen",
""
]
] | [
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] |
802.2551 | Sebastian Commichau S.C.C. | S.C. Commichau, A. Biland, J. L. Contreras, R. de los Reyes, A.
Moralejo, J. Sitarek and D. Sobczynska | Monte Carlo Studies of Geomagnetic Field Effects on the Imaging Air
Cherenkov Technique for the MAGIC Telescope Site | minor text changes | Nucl.Instrum.Meth.A595:572-586,2008 | 10.1016/j.nima.2008.07.144 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Imaging air Cherenkov telescopes (IACTs) detect the Cherenkov light from
extensive air showers (EAS) initiated by very high energy (VHE) gamma-rays
impinging on the Earth's atmosphere. Due to the overwhelming background from
hadron induced EAS, the discrimination of the rare gamma-like events is vital.
The influence of the geomagnetic field (GF) on the development of EAS can
further complicate the imaging air Cherenkov technique. The amount and the
angular distribution of Cherenkov light from EAS can be obtained by means of
Monte Carlo (MC) simulations. Here we present the results from dedicated MC
studies of GF effects on images from gamma-ray initiated EAS for the MAGIC
telescope site, where the GF strength is ~40 micro Tesla. The results from the
MC studies suggest that GF effects degrade not only measurements of very low
energy gamma-rays below ~100 GeV but also those at TeV-energies.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:14:25 GMT"
},
{
"version": "v2",
"created": "Mon, 19 May 2008 08:18:28 GMT"
},
{
"version": "v3",
"created": "Tue, 20 May 2008 09:40:43 GMT"
},
{
"version": "v4",
"created": "Fri, 25 Jul 2008 07:44:57 GMT"
}
] | "2009-06-23T00:00:00" | [
[
"Commichau",
"S. C.",
""
],
[
"Biland",
"A.",
""
],
[
"Contreras",
"J. L.",
""
],
[
"Reyes",
"R. de los",
""
],
[
"Moralejo",
"A.",
""
],
[
"Sitarek",
"J.",
""
],
[
"Sobczynska",
"D.",
""
]
] | [
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] |
802.2552 | John H. Debes | J. H. Debes, M. Lopez-Morales | A Second Look at the Metal Line Variability of G29-38 | 14 pages, 4 figures, Accepted to ApJL | null | 10.1086/587550 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pulsating white dwarf G29-38 possesses a dust disk and metal lines
attributed to the accretion of its disk material. \citet{vonhipg29} have
reported variability in the equivalent width of G29-38's CaII K line on the
timescale of days. We use high resolution optical spectroscopy of G29-38's CaII
K line to test this observation. Over six days spanning in June 2007 and
October 2007 we see no evidence for variability in the equivalent width of the
Ca II K line. We also sample the variability of the Ca II K line over
integrated timescales of $\sim$100-500 seconds, where errors from incomplete
coverage of pulsation modes are predicted to be $\sim$8-15%. We find that the
scatter of the equivalent widths over this time period is consistent with
measurement errors at the 7% level, slightly weaker than predicted but within
the uncertainties of predictions. Weaker Ca and Mg lines observed show no
significant variability on yearly timescales over ten years based on our data
and other high resolution spectra. We conclude that further study is warranted
to verify if the accretion onto G29-38 is variable.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:26:12 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Debes",
"J. H.",
""
],
[
"Lopez-Morales",
"M.",
""
]
] | [
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] |
802.2553 | Jose D'Incao | J. P. D'Incao, B. D. Esry, and Chris H. Greene | Ultracold atom-molecule collisions with fermionic atoms | 6 pages, 2 figures | Phys. Rev. A 77, 052709 (2008) | 10.1103/PhysRevA.77.052709 | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Elastic and inelastic properties of weakly bound s- and p-wave molecules of
fermionic atoms that collide with a third atom are investigated. Analysis of
calculated collisional properties of s-wave dimers of fermions in different
spin states permit us to compare and highlight the physical mechanisms that
determine the stability of s-wave and p-wave molecules. In contrast to s-wave
molecules, the collisional properties of p-wave molecules are found to be
largely insensitive to variations of the p-wave scattering length and that
these collisions will usually result in short molecular lifetimes. We also
discuss the importance of this result for both theories and experiments
involving degenerate Fermi gases.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:27:03 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 15:42:04 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"D'Incao",
"J. P.",
""
],
[
"Esry",
"B. D.",
""
],
[
"Greene",
"Chris H.",
""
]
] | [
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] |
802.2554 | Volodymyr Nekrashevych | Volodymyr Nekrashevych | Free subgroups in groups acting on rooted trees | null | null | null | null | math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that if a group $G$ acting faithfully on a rooted tree $T$ has a free
subgroup, then either there exists a point $w$ of the boundary $\partial T$ and
a free subgroup of $G$ with trivial stabilizer of $w$, or there exists
$w\in\partial T$ and a free subgroup of $G$ fixing $w$ and acting faithfully on
arbitrarily small neighborhoods of $w$. This can be used to prove absence of
free subgroups for different known classes of groups. For instance, we prove
that iterated monodromy groups of expanding coverings have no free subgroups
and give another proof of a theorem by S. Sidki.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:42:00 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Nekrashevych",
"Volodymyr",
""
]
] | [
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] |
802.2555 | Sebastien Ragot | Ragot Sebastien | Comments on the Hartree-Fock description of the Hooke's atom and
suggestion for an accurate closed-form orbital | 10 pages, submitted to JCP | S. Ragot. J. Chem. Phys. 128, 164104 (2008) | null | null | physics.atom-ph physics.chem-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ground-state Hartree-Fock (HF) wavefunction of the Hooke's atom is not
known in closed form, contrary to the exact solution. The single HF orbital
involved has thus far been studied using expansion techniques only, leading to
slightly disparate energies. Therefore, the present letter aims at proposing
alternative definitions of the HF wavefunction. First, the HF limit is
ascertained using a simple expansion, which makes it possible to formulate
explicit expressions of HF properties. The resulting energy, 2.038 438 871 8
Eh, is found stable at the tenth digit. Second and more instructive, an
analysis of the Hartree equation makes it possible to infer a remarkably simple
and accurate HF orbital, leading to an energy exceeding by 5.76 10-7 Eh only
the above HF limit. This orbital makes it possible to obtain (near)
Hartree-Fock properties in closed-form, which in turn enables handy comparisons
with exact quantities.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:50:34 GMT"
}
] | "2008-05-05T00:00:00" | [
[
"Sebastien",
"Ragot",
""
]
] | [
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] |
802.2556 | Gopal Narayanan | Gopal Narayanan, Mark H. Heyer, Christopher Brunt, Paul F. Goldsmith,
Ronald Snell, and Di Li | The Five College Radio Astronomy Observatory CO Mapping Survey of the
Taurus Molecular Cloud | 35 pages, 22 figures, Accepted for publication in Astrophysical
Journal Supplement Series; The figures have been compressed in this version.
Full-resolution figures of paper available at
http://www.astro.umass.edu/~gopal/taurus-datapaper/ | null | 10.1086/587786 | null | astro-ph | http://creativecommons.org/licenses/publicdomain/ | The FCRAO Survey of the Taurus Molecular Cloud observed the 12CO and 13CO
J=1-0 emission from 98 square degrees of this important, nearby star forming
region. This set of data with 45" resolution comprises the highest spatial
dynamic range image of an individual molecular cloud constructed to date, and
provides valuable insights to the molecular gas distribution, kinematics, and
the star formation process. In this contribution, we describe the observations,
calibration, data processing, and characteristics of the noise and line
emission of the survey. The angular distribution of 12CO and 13CO emission over
1 km/s velocity intervals and the full velocity extent of the cloud are
presented. These reveal a complex, dynamic medium of cold, molecular gas.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:56:13 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Narayanan",
"Gopal",
""
],
[
"Heyer",
"Mark H.",
""
],
[
"Brunt",
"Christopher",
""
],
[
"Goldsmith",
"Paul F.",
""
],
[
"Snell",
"Ronald",
""
],
[
"Li",
"Di",
""
]
] | [
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] |
802.2557 | Guglielmo Fucci | Guglielmo Fucci and Ivan G. Avramidi | Non-commutative Corrections in Spectral Matrix Gravity | 32 Pages, LaTex. Some nonessential typos in intermediate calculations
in sect. 3 and 4 are corrected. The final results are the same | Class.Quant.Grav.26:045019,2009 | 10.1088/0264-9381/26/4/045019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a non-commutative deformation of general relativity based on
spectral invariants of a partial differential operator acting on sections of a
vector bundle over a smooth manifold. We compute the first non-commutative
corrections to Einstein equations in the weak deformation limit and analyze the
spectrum of the theory. Related topics are discussed as well.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 21:58:03 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jan 2010 15:56:37 GMT"
}
] | "2011-02-17T00:00:00" | [
[
"Fucci",
"Guglielmo",
""
],
[
"Avramidi",
"Ivan G.",
""
]
] | [
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] |
802.2558 | Ken-Ichi Nishikawa | K.-I. Nishikawa (NSSTC/Uah) P. Hardee (UA) Y. Mizuno (NASA/MSFC/NSSTC)
M. Medvedev (U. Kansas) B. Zhang (UNLV) D. H. Hartmann (Clemson U.) G. J.
Fishman (NASA/MSFC) | Relativistic Particle-In-Cell Simulation Studies of Prompt and Early
Afterglows from GRBs | 19 pages,7 figures, contributed talk at Seventh European Workshop on
Collisionless Shocks, Paris, 7- 9 November 2007. High resolution version can
be obtained at http://gammaray.nsstc.nasa.gov/~nishikawa/shockws07.pdf | AIP Conf.Proc.1000:393-396,2008 | 10.1063/1.2943492 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonthermal radiation observed from astrophysical systems containing
relativistic jets and shocks e.g. gamma-ray bursts (GRBs) active galactic
nuclei (AGNs) and microquasars commonly exhibit power-law emission spectra.
Recent PIC simulations of relativistic electron-ion (or electron-positron) jets
injected into a stationary medium show that particle acceleration occurs within
the downstream jet. In collisionless relativistic shocks particle (electron,
positron and ion) acceleration is due to plasma waves and their associated
instabilities (e.g. the Weibel (filamentation) instability) created in the
shock region. The simulations show that the Weibel instability is responsible
for generating and amplifying highly non-uniform small-scale magnetic fields.
These fields contribute to the electron's transverse deflection behind the jet
head. The resulting ``jitter'' radiation from deflected electrons has different
properties compared to synchrotron radiation which assumes a uniform magnetic
field. Jitter radiation may be important for understanding the complex time
evolution and/or spectra in gamma-ray bursts, relativistic jets in general and
supernova remnants.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 22:01:48 GMT"
}
] | "2009-06-23T00:00:00" | [
[
"Nishikawa",
"K. -I.",
"",
"NSSTC/Uah"
],
[
"Hardee",
"P.",
"",
"UA"
],
[
"Mizuno",
"Y.",
"",
"NASA/MSFC/NSSTC"
],
[
"Medvedev",
"M.",
"",
"U. Kansas"
],
[
"Zhang",
"B.",
"",
"UNLV"
],
[
"Hartmann",
"D. H.",
"",
"Clemson U."
],
[
"Fishman",
"G. J.",
"",
"NASA/MSFC"
]
] | [
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802.2559 | Eugene Eliseev | Eugene A. Eliseev, Anna N. Morozovska, Sergei V. Kalinin, Yulan L. Li,
Jie Shen, Maya D. Glinchuk, Long-Qing Chen, and Venkatraman Gopalan | Surface Effect on Domain Wall Width in Ferroelectrics | 36 pages, 7 Figures, 1 Table, 3 Appendices, to be submitted to Phys.
Rev. B | null | 10.1063/1.3236644 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of depolarization field related with inhomogeneous
polarization distribution, strain and surface energy parameters on a domain
wall profile near the surface of a ferroelectric film within the framework of
Landau-Ginzburg-Devonshire phenomenology. Both inhomogeneous elastic stress and
positive surface energy lead to the wall broadening at electrically screened
surface. For ferroelectrics with weak piezoelectric coupling, the extrapolation
length that defines surface energy parameter, affects the wall broadening more
strongly than inhomogeneous elastic stress. Unexpectedly, the domain wall
profile follows a long-range power law when approaching the surface, while it
saturates exponentially in the bulk. In materials with high piezoelectric
coupling and negligibly small surface energy (i.e. high extrapolation length)
inhomogeneous elastic stress effect dominates.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 22:04:42 GMT"
},
{
"version": "v2",
"created": "Sat, 3 May 2008 15:32:25 GMT"
}
] | "2015-05-13T00:00:00" | [
[
"Eliseev",
"Eugene A.",
""
],
[
"Morozovska",
"Anna N.",
""
],
[
"Kalinin",
"Sergei V.",
""
],
[
"Li",
"Yulan L.",
""
],
[
"Shen",
"Jie",
""
],
[
"Glinchuk",
"Maya D.",
""
],
[
"Chen",
"Long-Qing",
""
],
[
"Gopalan",
"Venkatraman",
""
]
] | [
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] |
802.256 | Horacio E. Castillo | Azita Parsaeian and Horacio E. Castillo | Equilibrium and non-equilibrium fluctuations in a glass-forming liquid | v1: 5 pages, 4 figures v2: 5 pages, 4 figures. Now includes results
at three temperatures, two of them above T_{MCT} and one below T_{MCT}; and
more extensive discussion of connections to experiments | Phys. Rev. Lett. 102, 055704 (2009) | 10.1103/PhysRevLett.102.055704 | null | cond-mat.dis-nn cond-mat.soft cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Glass-forming liquids display strong fluctuations -- dynamical
heterogeneities -- near their glass transition. By numerically simulating a
binary Weeks-Chandler-Andersen liquid and varying both temperature and
timescale, we investigate the probability distributions of two kinds of local
fluctuations in the non-equilibrium (aging) regime and in the equilibrium
regime; and find them to be very similar in the two regimes and across
temperatures. We also observe that, when appropriately rescaled, the integrated
dynamic susceptibility is very weakly dependent on temperature and very similar
in both regimes.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 22:14:16 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Nov 2008 08:21:53 GMT"
}
] | "2011-08-15T00:00:00" | [
[
"Parsaeian",
"Azita",
""
],
[
"Castillo",
"Horacio E.",
""
]
] | [
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802.2561 | Sebastien Ragot | Ragot Sebastien | Comments on the momentum density and the spatial form of the
density-matrix of the Hooke's atom | 7 pages. Submitted | Phys. Rev. A 78, 016502 (2008) | 10.1103/PhysRevA.78.016502 | null | physics.atom-ph physics.chem-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, A. Akbari, N. H. March and A. Rubio [Phys. Rev. A. 76,
032510 (2007)] have investigated the one-electron reduced density-matrix and
the momentum density of several two-electron model atoms, including the Hooke's
atom. The method used by the authors for deriving an integral form of the
momentum density is well suited for deriving a closed-form expression of the
exact reciprocal form factor, which function is of importance inasmuch as it
reflects the off-diagonal side of the exact reduced density-matrix.
| [
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"version": "v1",
"created": "Mon, 18 Feb 2008 22:18:34 GMT"
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] | "2009-09-28T00:00:00" | [
[
"Sebastien",
"Ragot",
""
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802.2562 | Sinhue Amos Refugio Haro Corzo | Sinhue A.R. Haro-Corzo, Luc Binette, Yair Krongold | The big blue bump and soft X-ray excess of individual quasars | 3 pages, 1 figure, conference | null | null | null | astro-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | For 11 quasar, we find that the soft X-ray excess component is not
prolongation of the Big Blue Bump. Furthermore, adopting a theoretical
continuum that is absorbed by the appropriate amount of intrinsic dust, we are
able to reconcile this universal theoretical continuum with the UV break and
the softness problem. Para 11 quasares, encontramos que el exceso de rayos-X
suaves no es una prolongacion de la Gran Joroba Azul. Aun mas, adoptando un
continuo ionizante teorico absorbido por una cantidad diversa de polvo
intrinseco para cada quasar, podemos reconciliar este continuo teorico con el
quiebre UV con el problema de suavidad.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 22:20:24 GMT"
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] | "2008-02-20T00:00:00" | [
[
"Haro-Corzo",
"Sinhue A. R.",
""
],
[
"Binette",
"Luc",
""
],
[
"Krongold",
"Yair",
""
]
] | [
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802.2563 | Gerald A. Miller | Gerald A. Miller | Meson Clouds and Nucleon Electromagnetic Form Factors | 8 pages 4 figures. This is a written version of a talk presented at
the workshop "Exclusive Reactions at High Momentum Transfer" May 21-24, 2007
Jefferson Lab, Newport News, VA USA Replacement makes the abstract and text
consistent with Fig.4 | null | 10.1142/9789812796950_0009 | NT@UW-8-03 | nucl-th hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In contrast with common non-relativistic lore, the usual Sachs form factors
are not the Fourier transforms of charge or magnetization densities. Instead,
the two-dimensional Fourier transform of the electromagnetic $F_1$ form factor
is the charge charge density of partons in the transverse plane. An analysis of
the available data for neutron form factors leads to the result that the
neutron charge density is negative at the center, and that the square of the
transverse charge radius is positive. This contrasts with many expectations.
Additionally, the use of measured proton form factors leads to the result that
the proton's central $u$ quark charge density is larger than that of the $d$
quark by about 80%. The proton (neutron) charge density has a long range
positively (negatively) charged component indicative of a pion cloud.
| [
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] |
802.2564 | Jun Wu | Jun Wu, Yue-Jin Tan, Hong-Zhong Deng, Yong Li, Bin Liu, Xin Lv | Spectral Measure of Robustness in Complex Networks | 4 pages, 2 figures | null | null | null | cond-mat.stat-mech cond-mat.dis-nn math.CO | http://creativecommons.org/licenses/by/3.0/ | We introduce the concept of natural connectivity as a robustness measure of
complex networks. The natural connectivity has a clear physical meaning and a
simple mathematical formulation. It characterizes the redundancy of alternative
paths by quantifying the weighted number of closed walks of all lengths. We
show that the natural connectivity can be derived mathematically from the graph
spectrum as an average eigenvalue and that it increases strictly monotonically
with the addition of edges. We test the natural connectivity and compare it
with other robustness measures within a scenario of edge elimination. We
demonstrate that the natural connectivity has an acute discrimination which
agrees with our intuition.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 22:58:08 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Wu",
"Jun",
""
],
[
"Tan",
"Yue-Jin",
""
],
[
"Deng",
"Hong-Zhong",
""
],
[
"Li",
"Yong",
""
],
[
"Liu",
"Bin",
""
],
[
"Lv",
"Xin",
""
]
] | [
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] |
802.2565 | Gvozden Rukavina | Gvozden Rukavina | Quadratic recurrence equations - exact explicit solution of period four
fixed points functions in bifurcation diagram | 20 pages, 6 figures | null | null | null | nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article presents the exact solution of fixed points functions for the
cycle of period four of the quadratic recurrence equations. The solution is
demonstrated for the quadratic map and the logistic map. These recurrence
equations, presenting the real domain, as well as the Mandelbrot set,
presenting the complex domain, are at the very heart of dynamical systems and
chaos theory. Up to now, the closed explicit solutions of fixed points
functions have only been known for three bifurcation ranges: for the cycles of
period one, two and three. With the discovery of the solution for cycle four,
disclosed in this paper, further step has been made in our comprehension of
simultaneous complexity and simplicity which represents the beauty of nature.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 19:12:31 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Rukavina",
"Gvozden",
""
]
] | [
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] |
802.2566 | Peggy Li H.Y. | R.F. Bishop, P.H.Y. Li, R. Darradi, and J. Richter | The quantum $J_{1}$--$J_{1}'$--$J_{2}$ spin-1 Heisenberg model:
Influence of the interchain coupling on the ground-state magnetic ordering in
2D | 6 pages. 3 figures. Minor changes in content | Europhys. Lett. 83 (2008) 47004 | 10.1088/0953-8984/20/25/255251 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phase diagram of the isotropic $J_{1}$--$J_{1}'$--$J_{2}$
Heisenberg model for spin-1 particles on an anisotropic square lattice, using
the coupled cluster method. We find no evidence for an intermediate phase
between the N\'{e}el and stripe states, as compared with all previous results
for the corresponding spin-1/2 case. However, we find a quantum tricritical
point at $J_{1}'/J_{1} \approx0.66 \pm 0.03$, $J_{2}/J_{1} \approx0.35\pm0.02$,
where a line of second-order phase transitions between the quasi-classical
N\'{e}el and stripe-ordered phases (for $J_{1}'/J_{1} \lesssim 0.66$) meets a
line of first-order phase transitions between the same two states (for
$J_{1}'/J_{1} \gtrsim 0.66$)
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 22:40:17 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Apr 2008 17:53:21 GMT"
},
{
"version": "v3",
"created": "Sat, 14 Jun 2008 12:36:32 GMT"
}
] | "2010-05-07T00:00:00" | [
[
"Bishop",
"R. F.",
""
],
[
"Li",
"P. H. Y.",
""
],
[
"Darradi",
"R.",
""
],
[
"Richter",
"J.",
""
]
] | [
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] |
802.2567 | Leandro Vendramin | S. Freyre, M. Gra\~na, L. Vendramin | On Nichols algebras over PGL(2,q) and PSL(2,q) | Minor changes | J. Algebra Appl., Vol. 9, No. 2 (2010) 195-208 | 10.1142/S0219498810003823 | null | math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute necessary conditions on Yetter-Drinfeld modules over the groups
$\mathbf{PGL}(2,q)=\mathbf{PGL}(2,\FF_q)$ and
$\mathbf{PSL}(2,q)=\mathbf{PSL}(2,\FF_q)$ to generate finite dimensional
Nichols algebras. This is a first step towards a classification of pointed Hopf
algebras with group of group-likes isomorphic to one of these groups.
As a by-product of the techniques developed in this work, we prove that there
is no non-trivial finite-dimensional pointed Hopf algebra over the Mathieu
groups $M_{20}$ and $M_{21}=\mathbf{PSL}(3,4)$.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 11:04:20 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Mar 2009 19:18:42 GMT"
},
{
"version": "v3",
"created": "Mon, 23 Mar 2009 22:07:07 GMT"
}
] | "2010-07-26T00:00:00" | [
[
"Freyre",
"S.",
""
],
[
"Graña",
"M.",
""
],
[
"Vendramin",
"L.",
""
]
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802.2568 | Can Kilic | Can Kilic, Takemichi Okui, Raman Sundrum | Colored Resonances at the Tevatron: Phenomenology and Discovery
Potential in Multijets | 20 pages, 7 figures, pdflatex. Version to be published in JHEP,
paragraphs added discussing the phenomenology beyond the benchmark model, one
reference added | JHEP 0807:038,2008 | 10.1088/1126-6708/2008/07/038 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There exist several classes of theories beyond the Standard Model which
contain massive spin-1 color octets, generically called "colorons". Indeed we
argue that colorons inevitably appear in the spectrum whenever new colored
particles feel an additional confining force. Colorons are distinctive at
hadron colliders as this is the only environment in which they can be
resonantly produced. In the simplest models we show that the coloron naturally
decays to multijets via secondary resonances, which can be consistent with all
existing bounds, even for colorons as light as a few hundred GeV. We perform
representative case studies and show that a search in the four-jet channel at
the Tevatron has strong signal significance, while the LHC faces formidable
challenges for such a search.
| [
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"created": "Tue, 19 Feb 2008 20:07:45 GMT"
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{
"version": "v3",
"created": "Tue, 1 Jul 2008 19:22:09 GMT"
}
] | "2009-03-19T00:00:00" | [
[
"Kilic",
"Can",
""
],
[
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"Takemichi",
""
],
[
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""
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] |
802.2569 | Kimball A. Milton | K. A. Milton | Coulomb Resummation and Monopole Masses | 12 pages, 7 eps figures. Talk given in memory of I.L. Solovtsov at
Seminar in Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna, Russia
in January 2008 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic Coulomb resummation factor suggested by I.L. Solovtsov is
used to reanalyze the mass limits obtained for magnetic monopoles which might
have been produced at the Fermilab Tevatron. The limits given by the Oklahoma
experiment (Fermilab E882) are pushed close to the unitary bounds, so that the
lower limits on monopole masses are increased from around 250 GeV to about 400
GeV.
| [
{
"version": "v1",
"created": "Mon, 18 Feb 2008 23:45:44 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Milton",
"K. A.",
""
]
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] |
802.257 | Jian Song | Jian Song, Gang Tian | Canonical measures and Kahler-Ricci flow | 56 pages | null | null | null | math.DG math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Kahler-Ricci flow on an algebraic manifold of positive
Kodaira dimension and semi-ample canonical line bundle converges to a unique
canonical metric on its canonical model. It is also shown that there exists a
canonical measure of analytic Zariski decomposition on an algebraic manifold of
positive Kodaira dimension. Such a canonical measure is unique and invariant
under birational transformations under the assumption of the finite generation
of canonical rings.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 04:13:45 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Song",
"Jian",
""
],
[
"Tian",
"Gang",
""
]
] | [
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802.2571 | Christopher Thompson | Christopher Thompson | Electrodynamics of Magnetars III: Pair Creation Processes in an
Ultrastrong Magnetic Field and Particle Heating in a Dynamic Magnetosphere | 25 pages, submitted to the Astrophysical Journal | null | 10.1086/592263 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the details of the QED processes that create electron-positron
pairs in magnetic fields approaching and exceeding 10^{14} G. The formation of
free and bound pairs is addressed, and the importance of positronium
dissociation by thermal X-rays is noted. We calculate the collision cross
section between an X-ray and a gamma ray, and point out a resonance in the
cross section when the gamma ray is close to the threshold for pair conversion.
We also discuss how the pair creation rate in the open-field circuit and the
outer magnetosphere can be strongly enhanced by instabilities near the light
cylinder. When the current has a strong fluctuating component, a cascade
develops. We examine the details of particle heating, and show that a high rate
of pair creation can be sustained close to the star, but only if the spin
period is shorter than several seconds. The dissipation rate in this turbulent
state can easily accommodate the observed radio output of the transient
radio-emitting magnetars, and even their infrared emission. Finally, we outline
how a very high rate of pair creation on the open magnetic field lines can help
to stabilize a static twist in the closed magnetosphere and to regulate the
loss of magnetic helicity by reconnection at the light cylinder.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 17:29:44 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Thompson",
"Christopher",
""
]
] | [
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] |
802.2572 | Christopher Thompson | Christopher Thompson | Electrodynamics of Magnetars IV: Self-Consistent Model of the Inner
Accelerator, with Implications for Pulsed Radio Emission | 32 pages, submitted to the Astrophysical Journal | null | 10.1086/592061 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the voltage structure in the open-field circuit and outer
magnetosphere of a magnetar. The standard polar-cap model for radio pulsars is
modified significantly when the polar magnetic field exceeds 1.8x10^{14} G.
Pairs are created by accelerated particles via resonant scattering of thermal
X-rays, followed by the nearly instantaneous conversion of the scattered photon
to a pair. A surface gap is then efficiently screened by e+- creation, which
regulates the voltage in the inner part of the circuit to ~10^9 V. We also
examine the electrostatic gap structure that can form when the magnetic field
is somewhat weaker, and deduce a voltage 10-30 times larger over a range of
surface temperatures. We examine carefully how the flow of charge back to the
star above the gap depends on the magnitude of the current that is extracted
from the surface of the star, on the curvature of the magnetic field lines, and
on resonant drag. The rates of different channels of pair creation are
determined self-consistently, including the non-resonant scattering of X-rays,
and collisions between gamma rays and X-rays. We find that the electrostatic
gap solution has too small a voltage to sustain the observed pulsed radio
output of magnetars unless i) the magnetic axis is nearly aligned with the
rotation axis and the light of sight; or ii) the gap is present on the closed
as well as the open magnetic field lines. Several properties of the radio
magnetars -- their rapid variability, broad pulses, and unusually hard radio
spectra -- are consistent with a third possibility, that the current in the
outer magnetosphere is strongly variable, and a very high rate of pair creation
is sustained by a turbulent cascade.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 16:10:04 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Thompson",
"Christopher",
""
]
] | [
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] |
802.2573 | Jiangming Zhang | J. M. Zhang, W. M. Liu, and D. L. Zhou | Mean-field dynamics of a Bose Josephson junction in an optical cavity | revised according to the comments of the referee | Phys.Rev.A, 78, 043618 (2008) | 10.1103/PhysRevA.78.043618 | null | quant-ph cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the mean-field dynamics of a Bose Josephson junction which is
dispersively coupled to a single mode of a high-finesse optical cavity. An
effective classical Hamiltonian for the Bose Josephson junction is derived and
its dynamics is studied in the perspective of phase portrait. It is shown that
the strong condensate-field coupling does alter the dynamics of the Bose
Josephson junction drastically. The possibility of coherent manipulating and
\textsl{in situ} observation of the dynamics of the Bose Josephson junction is
discussed.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 01:40:00 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 16:03:39 GMT"
},
{
"version": "v3",
"created": "Tue, 22 Apr 2008 12:35:20 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Zhang",
"J. M.",
""
],
[
"Liu",
"W. M.",
""
],
[
"Zhou",
"D. L.",
""
]
] | [
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] |
802.2574 | Terence H. Chan | Laurent Guille, Terence Chan and Alex Grant | The minimal set of Ingleton inequalities | null | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Ingleton-LP bound is an outer bound for the multicast capacity region,
assuming the use of linear network codes. Computation of the bound is performed
on a polyhedral cone obtained by taking the intersection of half-spaces induced
by the basic (Shannon-type) inequalities and Ingleton inequalities. This paper
simplifies the characterization of this cone, by obtaining the unique minimal
set of Ingleton inequalities. As a result, the effort required for computation
of the Ingleton-LP bound can be greatly reduced.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 01:55:23 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Guille",
"Laurent",
""
],
[
"Chan",
"Terence",
""
],
[
"Grant",
"Alex",
""
]
] | [
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] |
802.2575 | Ian Agol | Ian Agol | Pants immersed in hyperbolic 3-manifolds | 12 pages, 4 figures | null | null | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that an immersed thrice-punctured sphere in a cusped orientable
hyperbolic 3-manifold is either embedded or has a single clasp in a manifold
obtained by hyperbolic Dehn filling on a cusp of the Whitehead link complement.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 14:47:05 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Agol",
"Ian",
""
]
] | [
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] |
802.2576 | Jeremy L. Martin | Art M. Duval, Caroline J. Klivans, Jeremy L. Martin | Simplicial matrix-tree theorems | 36 pages, 2 figures. Final version, to appear in Trans. Amer. Math.
Soc | Trans. Amer. Math. Soc. 361 (2009), no. 11, 6073-6114 | null | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the definition and enumeration of spanning trees from the
setting of graphs to that of arbitrary-dimensional simplicial complexes
$\Delta$, extending an idea due to G. Kalai. We prove a simplicial version of
the Matrix-Tree Theorem that counts simplicial spanning trees, weighted by the
squares of the orders of their top-dimensional integral homology groups, in
terms of the Laplacian matrix of $\Delta$. As in the graphic case, one can
obtain a more finely weighted generating function for simplicial spanning trees
by assigning an indeterminate to each vertex of $\Delta$ and replacing the
entries of the Laplacian with Laurent monomials. When $\Delta$ is a shifted
complex, we give a combinatorial interpretation of the eigenvalues of its
weighted Laplacian and prove that they determine its set of faces uniquely,
generalizing known results about threshold graphs and unweighted Laplacian
eigenvalues of shifted complexes.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 02:04:49 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Aug 2008 11:54:37 GMT"
}
] | "2011-10-05T00:00:00" | [
[
"Duval",
"Art M.",
""
],
[
"Klivans",
"Caroline J.",
""
],
[
"Martin",
"Jeremy L.",
""
]
] | [
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] |
802.2577 | Tao Zhou | Wei Hong, Xiaopu Han, Tao Zhou, and Binghong Wang | Heavy-tailed statistics in short-message communication | 4 pages, 4 figures and 1 table | Chinese Physics Letters 26 (2009) 028902 | 10.1088/0256-307X/26/2/028902 | null | physics.soc-ph physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Short-message (SM) is one of the most frequently used communication channels
in the modern society. In this Brief Report, based on the SM communication
records provided by some volunteers, we investigate the statistics of SM
communication pattern, including the interevent time distributions between two
consecutive short messages and two conversations, and the distribution of
message number contained by a complete conversation. In the individual level,
the current empirical data raises a strong evidence that the human activity
pattern, exhibiting a heavy-tailed interevent time distribution, is driven by a
non-Poisson nature.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 02:16:11 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Hong",
"Wei",
""
],
[
"Han",
"Xiaopu",
""
],
[
"Zhou",
"Tao",
""
],
[
"Wang",
"Binghong",
""
]
] | [
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] |
802.2578 | Vladimir Avila-Reese | V. Avila-Reese (1), C. Firmani (1,2), G. Ghisellini (2), J. I. Cabrera
(1) ((1)IA-UNAM, Mexico; (2) INAF-OAB, Italy) | Gamma-Ray Bursts, new cosmological beacons | 7 pages, 3 figures. Invited talk, to appear in RevMexAA Conf. Series
(XII IAU Regional Latinamerican Meeting, Isla de Margarita, October 22-26).
Corrected typos, added references | Rev.Mex.Astron.Astrof.Ser.Conf.35:188,2009 | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Long Gamma-Ray Bursts (GRBs) are the brightest electromagnetic explosions in
the Universe, associated to the death of massive stars. As such, GRBs are
potential tracers of the evolution of the cosmic massive star formation,
metallicity, and Initial Mass Function. GRBs also proved to be appealing
cosmological distance indicators. This opens a unique opportunity to constrain
the cosmic expansion history up to redshifts 5-6. A brief review on both
subjects is presented here.
| [
{
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"created": "Tue, 19 Feb 2008 02:18:28 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 19:13:05 GMT"
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] | "2011-02-01T00:00:00" | [
[
"Avila-Reese",
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"",
"IA-UNAM, Mexico;"
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[
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"",
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"",
"INAF-OAB, Italy"
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[
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"J. I.",
"",
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802.2579 | FengLan Shao | Yun-fei Wang, Feng-lan Shao, Jun Song, De-ming Wei, Qu-bing Xie | Centrality dependence of $p_{T}$ spectra for identified hadrons in Au+Au
and Cu+Cu collisions at $\sqrt{s_{NN}}= 200$ GeV | 7 pages, 6 figures | Chinese Physics C32, 976 (2008) | 10.1088/1674-1137/32/12/007 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The centrality dependence of transverse momentum spectra for identified
hadrons at midrapidity in Au+Au collisions at $\sqrt{s_{NN}}= 200$ GeV is
systematically studied in a quark combination model. The $\mathrm{{p}_{T}}$
spectra of $\pi^{\pm}$, $K^{\pm}$, $p(\bar{p})$ and $\Lambda(\bar{\Lambda})$ in
different centrality bins and the nuclear modification factors ($R_{CP}$) for
these hadrons are calculated. The centrality dependence of the average
collective transverse velocity $<\beta (r)>$ for the hot and dense quark matter
is obtained in Au+Au collisions, and it is applied to a relative smaller Cu+Cu
collision system. The centrality dependence of $\mathrm{{p}_{T}}$ spectra and
the $R_{CP}$ for $\pi^{0}$, $K_{s}^{0}$ and $\Lambda$ in Cu+Cu collisions at
$\sqrt{s_{NN}}= 200$ GeV are well described. The results show that $<\beta
(r)>$ is only a function of the number of participants $N_{part}$ and it is
independent of the collision system.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 02:36:33 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Mar 2009 07:22:53 GMT"
}
] | "2015-05-13T00:00:00" | [
[
"Wang",
"Yun-fei",
""
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[
"Shao",
"Feng-lan",
""
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[
"Song",
"Jun",
""
],
[
"Wei",
"De-ming",
""
],
[
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802.258 | Luo | Feng Luo | 3-Dimensional Schlaefli Formula and Its Generalization | 2 figure, 8 pages | null | null | null | math.GT math.MG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several identities similar to the Schlaefli formula are established for
tetrahedra in a space of constant curvature.
| [
{
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] |
802.2581 | Hisayuki Hara | Hisayuki Hara and Akimichi Takemura | A Localization Approach to Improve Iterative Proportional Scaling in
Gaussian Graphical Models | 12 pages | Communications in Statistics Theory and Methods, 39, No.8,
1643-1654, 2010 | 10.1080/03610920802238662 | null | stat.CO stat.ME | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss an efficient implementation of the iterative proportional scaling
procedure in the multivariate Gaussian graphical models. We show that the
computational cost can be reduced by localization of the update procedure in
each iterative step by using the structure of a decomposable model obtained by
triangulation of the graph associated with the model. Some numerical
experiments demonstrate the competitive performance of the proposed algorithm.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 03:00:55 GMT"
},
{
"version": "v2",
"created": "Wed, 28 May 2008 01:07:24 GMT"
}
] | "2010-07-22T00:00:00" | [
[
"Hara",
"Hisayuki",
""
],
[
"Takemura",
"Akimichi",
""
]
] | [
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] |
802.2582 | Daniel Stolarski | Yasunori Nomura, Michele Papucci, Daniel Stolarski | Flavorful Supersymmetry from Higher Dimensions | 31 pages, 2 figures; references and comments added | JHEP 0807:055,2008 | 10.1088/1126-6708/2008/07/055 | UCB-PTH-08/03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present models of flavorful supersymmetry in higher dimensions. The Higgs
fields and the supersymmetry breaking field are localized in the same place in
the extra dimension(s). The Yukawa couplings and operators generating the
supersymmetry breaking parameters then receive the same suppression factors
from the wavefunction profiles of the matter fields, leading to a specific
correlation between these two classes of interactions. The resulting
phenomenology is very rich, while stringent experimental constraints from the
low-energy flavor and CP violating processes can all be satisfied. We construct
both unified and non-unified models in this framework, which can be either
strongly or weakly coupled at the cutoff scale. We analyze one version in
detail, a strongly coupled unified model, which addresses various issues of
supersymmetric grand unification. The models presented here provide an explicit
example in which the supersymmetry breaking spectrum can be a direct window
into the physics of flavor at a very high energy scale.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 03:35:46 GMT"
},
{
"version": "v2",
"created": "Thu, 15 May 2008 18:58:11 GMT"
}
] | "2009-05-08T00:00:00" | [
[
"Nomura",
"Yasunori",
""
],
[
"Papucci",
"Michele",
""
],
[
"Stolarski",
"Daniel",
""
]
] | [
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] |
802.2583 | Katie Freese | Katherine Freese, Matthew G. Brown, and William H. Kinney | The Phantom Bounce: A New Proposal for an Oscillating Cosmology | New York Academy of Sciences Proceedings, Origins of Time's Arrow
Conference, October 2007 | null | null | null | astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An oscillating universe cycles through a series of expansions and
contractions. We propose a model in which ``phantom'' energy with a
supernegative pressure ($p < - \rho$) grows rapidly and dominates the late-time
expanding phase. The universe's energy density is then so large that the
effects of quantum gravity are important at both the beginning and the end of
each expansion (or contraction). The bounce can be caused by high energy
modifications to the Friedmann equation governing the expansion of the
universe, which make the cosmology nonsingular. The classic black hole
overproduction of oscillating universes is resolved due to their destruction by
the phantom energy.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 03:57:20 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Feb 2008 22:16:59 GMT"
}
] | "2008-03-29T00:00:00" | [
[
"Freese",
"Katherine",
""
],
[
"Brown",
"Matthew G.",
""
],
[
"Kinney",
"William H.",
""
]
] | [
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] |
802.2584 | Taizan Watari | Minoru Kuriyama, Hiroto Nakajima and Taizan Watari | A Theoretical Framework for R-parity Violation | null | null | 10.1103/PhysRevD.79.075002 | UT-08-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a theoretical framework for R-parity violation. It is realized by
a class of Calabi--Yau compactification of Heterotic string theory. Trilinear
R-parity violation in superpotential is either absent or negligibly small
without an unbroken symmetry, due to a selection rule based on charge counting
of a spontaneously broken U(1) symmetry. Although such a selection rule cannot
be applied in general to non-renormalizable operators in the low-energy
effective superpotential, it is valid for terms trilinear in low-energy degrees
of freedom, and hence can be used as a solution to the dimension-4 proton decay
problem in the minimal supersymmetric standard model. Bilinear R-parity
violation is generated, but there are good reasons why they are small enough to
satisfy its upper bounds from neutrino mass and washout of baryon/lepton
asymmetry. All R-parity violating dimension-5 operators can be generated. In
this theoretical framework, nucleons can decay through squark-exchange diagrams
combining dimension-5 and bilinear R-parity violating operators. B-L breaking
neutron decay is predicted.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 20:52:48 GMT"
}
] | "2013-05-29T00:00:00" | [
[
"Kuriyama",
"Minoru",
""
],
[
"Nakajima",
"Hiroto",
""
],
[
"Watari",
"Taizan",
""
]
] | [
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802.2585 | Keiko Kawamuro | Keiko Kawamuro | Connect sum and transversely non simple knots | Following the referee, exposition is changed and misprints are
corrected | null | 10.1017/S0305004108002028 | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that transversal non-simplicity is preserved under taking connect
sum, generalizing Vertesi's result.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 20:49:23 GMT"
},
{
"version": "v2",
"created": "Mon, 19 May 2008 21:53:54 GMT"
}
] | "2015-05-13T00:00:00" | [
[
"Kawamuro",
"Keiko",
""
]
] | [
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] |
802.2586 | Jiaolin Xu | Jiao-Lin Xu | The New Symmetries Beyond the Standard Model (The Body-centred Cubic
Periodic Symmetries in Particle Physics) | 69 Pages, 8 Figures | null | null | null | physics.gen-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper proposes new symmetries (the body-centred cubic periodic
symmetries) beyond the standard model. Using a free particle expanded
Schrodinger equation with the body-centred cubic periodic symmetry condition,
the paper deduces a full baryon spectrum (including mass M, I, S, C, B, Q, J
and P) of all 116 observed baryons. All quantum numbers of all deduced baryons
are completely consistent with the corresponding experimental results. The
deduced masses of all 116 baryons agree with (more than average 98 percent) the
experimental baryon masses using only four constant parameters. The
body-centred cubic periodic symmetries with a periodic constant ``a'' about
$10^{-23}$m play a crucial rule. The results strongly suggest that the new
symmetries really exist. This paper predicts some kind of ``Zeeman effect'' of
baryons, for example: one experimental baryon N(1720)${3/2}^{+}$ with $ \Gamma$
= 200 Mev is composed of two N baryons [(N(1659)${3/2}^{+}$ +
N(1839)${3/2}^{+}$] = $\bar{N(1749)}$${3/2}^{+}$ with $\Gamma$ = 1839-1659 =
180 Mev.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 04:34:34 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 22:45:14 GMT"
}
] | "2009-12-07T00:00:00" | [
[
"Xu",
"Jiao-Lin",
""
]
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] |
802.2587 | Alexandros Dimakis | F. Benezit, A.G. Dimakis, P. Thiran, M. Vetterli | Order-Optimal Consensus through Randomized Path Averaging | 26 pages | null | null | null | cs.IT cs.NI math.IT math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gossip algorithms have recently received significant attention, mainly
because they constitute simple and robust message-passing schemes for
distributed information processing over networks. However for many topologies
that are realistic for wireless ad-hoc and sensor networks (like grids and
random geometric graphs), the standard nearest-neighbor gossip converges as
slowly as flooding ($O(n^2)$ messages).
A recently proposed algorithm called geographic gossip improves gossip
efficiency by a $\sqrt{n}$ factor, by exploiting geographic information to
enable multi-hop long distance communications. In this paper we prove that a
variation of geographic gossip that averages along routed paths, improves
efficiency by an additional $\sqrt{n}$ factor and is order optimal ($O(n)$
messages) for grids and random geometric graphs.
We develop a general technique (travel agency method) based on Markov chain
mixing time inequalities, which can give bounds on the performance of
randomized message-passing algorithms operating over various graph topologies.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 04:37:51 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Benezit",
"F.",
""
],
[
"Dimakis",
"A. G.",
""
],
[
"Thiran",
"P.",
""
],
[
"Vetterli",
"M.",
""
]
] | [
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] |
802.2588 | Koji Maruyama | Koji Maruyama, Franco Nori | Entanglement purification without controlled-NOT gates by using the
natural dynamics of spin chains | 4 figures | Phys. Rev. A 78, 022312 (2008) | 10.1103/PhysRevA.78.022312 | null | quant-ph cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple protocol to purify bipartite entanglement in spin-1/2
particles by utilizing only natural spin-spin interactions, i.e. those that can
commonly be realized in realistic physical systems, and S_z-measurements on
single spins. Even the standard isotropic Heisenberg interaction is shown to be
sufficient to purify mixed state entanglement if there are at least three pairs
of spins. This approach could be useful for quantum information processing in
solid-state-based systems.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 04:43:44 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Aug 2008 03:40:20 GMT"
}
] | "2008-10-23T00:00:00" | [
[
"Maruyama",
"Koji",
""
],
[
"Nori",
"Franco",
""
]
] | [
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] |
802.2589 | Daqing Wan | Chunlei Liu and Daqing Wan | T-adic exponential sums over finite fields | new version, 21 pages, title is changed too | null | null | null | math.NT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $T$-adic exponential sums associated to a Laurent polynomial $f$ are
introduced. They interpolate all classical $p^m$-power order exponential sums
associated to $f$. The Hodge bound for the Newton polygon of $L$-functions of
$T$-adic exponential sums is established. This bound enables us to determine,
for all $m$, the Newton polygons of $L$-functions of $p^m$-power order
exponential sums associated to an $f$ which is ordinary for $m=1$. Deeper
properties of $L$-functions of $T$-adic exponential sums are also studied.
Along the way, new open problems about the $T$-adic exponential sum itself are
discussed.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 04:49:15 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Feb 2008 00:40:48 GMT"
},
{
"version": "v3",
"created": "Sun, 2 Mar 2008 03:55:28 GMT"
},
{
"version": "v4",
"created": "Wed, 7 Jan 2009 06:01:49 GMT"
}
] | "2009-01-07T00:00:00" | [
[
"Liu",
"Chunlei",
""
],
[
"Wan",
"Daqing",
""
]
] | [
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802.259 | Bunei Sato | Bun'ei Sato, Hideyuki Izumiura, Eri Toyota, Eiji Kambe, Masahiro
Ikoma, Masashi Omiya, Seiji Masuda, Yoichi Takeda, Daisuke Murata, Yoichi
Itoh, Hiroyasu Ando, Michitoshi Yoshida, Eiichiro Kokubo, Shigeru Ida | Planetary Companions around Three Intermediate-Mass G and K Giants: 18
Del, xi Aql, and HD 81688 | 28 pages, 9 figures, accepted for publication in PASJ | null | 10.1093/pasj/60.3.539 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report the detection of 3 new extrasolar planets from the precise Doppler
survey of G and K giants at Okayama Astrophysical Observatory. The host stars,
namely, 18 Del (G6 III), xi Aql (K0 III) and HD 81688 (K0 III-IV), are located
at the clump region on the HR diagram with estimated masses of 2.1-2.3 M_solar.
18 Del b has a minimum mass of 10.3 M_Jup and resides in a nearly circular
orbit with period of 993 days, which is the longest one ever discovered around
evolved stars. xi Aql b and HD 81688 b have minimum masses of 2.8 and 2.7
M_Jup, and reside in nearly circular orbits with periods of 137 and 184 days,
respectively, which are the shortest ones among planets around evolved stars.
All of the substellar companions ever discovered around possible
intermediate-mass (1.7-3.9 M_solar) clump giants have semimajor axes larger
than 0.68 AU, suggesting the lack of short-period planets. Our numerical
calculations suggest that Jupiter-mass planets within about 0.5 AU (even up to
1 AU depending on the metallicity and adopted models) around 2-3 M_solar stars
could be engulfed by the central stars at the tip of RGB due to tidal torque
from the central stars. Assuming that most of the clump giants are post-RGB
stars, we can not distinguish whether the lack of short-period planets is
primordial or due to engulfment by central stars. Deriving reliable mass and
evolutionary status for evolved stars is highly required for further
investigation of formation and evolution of planetary systems around
intermediate-mass stars.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 05:19:59 GMT"
}
] | "2015-05-13T00:00:00" | [
[
"Sato",
"Bun'ei",
""
],
[
"Izumiura",
"Hideyuki",
""
],
[
"Toyota",
"Eri",
""
],
[
"Kambe",
"Eiji",
""
],
[
"Ikoma",
"Masahiro",
""
],
[
"Omiya",
"Masashi",
""
],
[
"Masuda",
"Seiji",
""
],
[
"Takeda",
"Yoichi",
""
],
[
"Murata",
"Daisuke",
""
],
[
"Itoh",
"Yoichi",
""
],
[
"Ando",
"Hiroyasu",
""
],
[
"Yoshida",
"Michitoshi",
""
],
[
"Kokubo",
"Eiichiro",
""
],
[
"Ida",
"Shigeru",
""
]
] | [
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] |
802.2591 | Scott Papp | S. B. Papp, J. M. Pino, and C. E. Wieman | Studying a dual-species BEC with tunable interactions | null | null | null | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the observation of controllable spatial separation in a
dual-species Bose-Einstein condensate (BEC) with $^{85}$Rb and $^{87}$Rb.
Interparticle interactions between the different components can change the
miscibility of the two quantum fluids. In our experiments, we clearly observe
the immiscible nature of the two simultaneously Bose-condensed species via
their spatial separation. Furthermore the $^{85}$Rb Feshbach resonance near 155
G is used to change them between miscible and immiscible by tuning the
$^{85}$Rb scattering length. Our apparatus is also able to create $^{85}$Rb
condensates with up to $8\times10^4$ atoms which represents a significant
improvement over previous work.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 07:38:49 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Papp",
"S. B.",
""
],
[
"Pino",
"J. M.",
""
],
[
"Wieman",
"C. E.",
""
]
] | [
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] |
802.2592 | Eric Nordenstam | Eric Nordenstam | On the Shuffling Algorithm for Domino Tilings | 17 pages, 2 figures | null | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of a certain discrete model of interacting particles
that comes from the so called shuffling algorithm for sampling a random tiling
of an Aztec diamond. It turns out that the transition probabilities have a
particularly convenient determinantal form. An analogous formula in a
continuous setting has recently been obtained by Jon Warren studying certain
model of interlacing Brownian motions which can be used to construct Dyson's
non-intersecting Brownian motion.
We conjecture that Warren's model can be recovered as a scaling limit of our
discrete model and prove some partial results in this direction. As an
application to one of these results we use it to rederive the known result that
random tilings of an Aztec diamond, suitably rescaled near a turning point,
converge to the GUE minor process.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 05:58:09 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Nordenstam",
"Eric",
""
]
] | [
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802.2593 | Masanori Hirai | M. Hirai, S. Kumano, M. Oka, and K. Sudoh | Determination of f_0(980) Structure by Fragmentation Functions | 4page, 2eps figures, To appear in the proceedings of Chiral Symmetry
in Hadron and Nuclear Physics (Chiral 07), Osaka, Japan, 13-16 Nov. 2007 | Mod.Phys.Lett.A23:2226-2229,2008 | 10.1142/S0217732308029071 | KEK-TH-1225 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss internal structure of an exotic hadron by using fragmentation
functions. The fragmentation functions for the f_0(980) meson are obtained by a
global analysis of e^++e^- \to f_0+X data. Quark configuration of the f_0(980)
could be determined by peak positions and second moments of the obtained
fragmentation functions.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 06:09:16 GMT"
}
] | "2008-11-26T00:00:00" | [
[
"Hirai",
"M.",
""
],
[
"Kumano",
"S.",
""
],
[
"Oka",
"M.",
""
],
[
"Sudoh",
"K.",
""
]
] | [
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802.2594 | Menelaos Karavelas | Menelaos I. Karavelas and Elias P. Tsigaridas | Guarding curvilinear art galleries with vertex or point guards | 35 pages, 24 figures | Comput. Geom. Theory Appl. 42(6-7):522-535, 2009 | 10.1016/j.comgeo.2008.11.002 | null | cs.CG | null | One of the earliest and most well known problems in computational geometry is
the so-called art gallery problem. The goal is to compute the minimum possible
number guards placed on the vertices of a simple polygon in such a way that
they cover the interior of the polygon.
In this paper we consider the problem of guarding an art gallery which is
modeled as a polygon with curvilinear walls. Our main focus is on polygons the
edges of which are convex arcs pointing towards the exterior or interior of the
polygon (but not both), named piecewise-convex and piecewise-concave polygons.
We prove that, in the case of piecewise-convex polygons, if we only allow
vertex guards, $\lfloor\frac{4n}{7}\rfloor-1$ guards are sometimes necessary,
and $\lfloor\frac{2n}{3}\rfloor$ guards are always sufficient. Moreover, an
$O(n\log{}n)$ time and O(n) space algorithm is described that produces a vertex
guarding set of size at most $\lfloor\frac{2n}{3}\rfloor$. When we allow point
guards the afore-mentioned lower bound drops down to
$\lfloor\frac{n}{2}\rfloor$. In the special case of monotone piecewise-convex
polygons we can show that $\lfloor\frac{n}{2}\rfloor$ vertex guards are always
sufficient and sometimes necessary; these bounds remain valid even if we allow
point guards.
In the case of piecewise-concave polygons, we show that $2n-4$ point guards
are always sufficient and sometimes necessary, whereas it might not be possible
to guard such polygons by vertex guards. We conclude with bounds for other
types of curvilinear polygons and future work.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 06:10:17 GMT"
}
] | "2009-11-25T00:00:00" | [
[
"Karavelas",
"Menelaos I.",
""
],
[
"Tsigaridas",
"Elias P.",
""
]
] | [
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802.2595 | Mohammad Reza Setare | M. R. Setare and E. N. Saridakis | Coupled oscillators as models of quintom dark energy | 11 pages, no figures | Phys.Lett.B668:177-181,2008 | 10.1016/j.physletb.2008.08.033 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate quintom cosmology in FRW universes using isomorphic models
consisting of three coupled oscillators, one of which carries negative kinetic
energy. In particular, we examine the cosmological paradigms of
minimally-coupled massless quintom, of two conformally-coupled massive scalars
and of conformally-coupled massive quintom, and we obtain their qualitative
characteristics as well as their quantitative asymptotic behavior. For open or
flat geometries, we find that, independently of the specific initial
conditions, the universe is always led to an eternal expansion.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 06:12:45 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Sep 2008 13:15:00 GMT"
}
] | "2008-11-26T00:00:00" | [
[
"Setare",
"M. R.",
""
],
[
"Saridakis",
"E. N.",
""
]
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802.2596 | Irine Peng | Irine Peng | Coarse differentiation and quasi-isometries of a class of solvable Lie
groups I | 48 pages (10pt, wide textwidth), 8 figures | null | null | null | math.MG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the first of two papers which aim to understand quasi-isometries of a
subclass of unimodular split solvable Lie groups. In the present paper, we show
that locally (in a coarse sense), a quasi-isometry between two groups in this
subclass is close to a map that respects their group structures.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 06:17:39 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Peng",
"Irine",
""
]
] | [
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802.2597 | Chris Judge | Luc Hillairet and Chris Judge | The eigenvalues of the Laplacian on domains with small slits | 29 pages, 3 figures | null | null | null | math.SP math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a small slit into a planar domain and study the resulting effect
upon the eigenvalues of the Laplacian. In particular, we show that as the
length of the slit tends to zero, each real-analytic eigenvalue branch tends to
an eigenvalue of the original domain. By combining this with our earlier work
(arXiv:math/0703616), we obtain the following application: The generic multiply
connected polygon has simple spectrum.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 18:34:41 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Hillairet",
"Luc",
""
],
[
"Judge",
"Chris",
""
]
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] |
802.2598 | FengLan Shao | De-ming Wei, Feng-lan Shao, Jun Song, Yun-fei Wang | Centrality, system size and energy dependences of charged-particle
pseudo-rapidity distribution | 12 pages, 8 figures | Int.J.Mod.Phys.A23:5217-5227,2008 | 10.1142/S0217751X08042560 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | Utilizing the three-fireball picture within the quark combination model, we
study systematically the charged particle pseudorapidity distributions in both
Au+Au and Cu+Cu collision systems as a function of collision centrality and
energy, $\sqrt{s_{NN}}=$ 19.6, 62.4, 130 and 200 GeV, in full pseudorapidity
range. We find that: (i)the contribution from leading particles to
$dN_{ch}/d\eta$ distributions increases with the decrease of the collision
centrality and energy respectively; (ii)the number of the leading particles is
almost independent of the collision energy, but it does depend on the nucleon
participants $N_{part}$; (iii)if Cu+Cu and Au+Au collisions at the same
collision energy are selected to have the same $N_{part}$, the resulting of
charged particle $dN/d\eta$ distributions are nearly identical, both in the
mid-rapidity particle density and the width of the distribution. This is true
for both 62.4 GeV and 200 GeV data. (iv)the limiting fragmentation phenomenon
is reproduced. (iiv) we predict the total multiplicity and pseudorapidity
distribution for the charged particles in Pb+Pb collisions at $\sqrt{s_{NN}}=
5.5$ TeV. Finally, we give a qualitative analysis of the $N_{ch}/<N_{part}/2>$
and $dN_{ch}/d\eta/<N_{part}/2>|_{\eta\approx0}$ as function of $\sqrt{s_{NN}}$
and $N_{part}$ from RHIC to LHC.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 06:38:26 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Mar 2009 12:40:10 GMT"
}
] | "2010-01-08T00:00:00" | [
[
"Wei",
"De-ming",
""
],
[
"Shao",
"Feng-lan",
""
],
[
"Song",
"Jun",
""
],
[
"Wang",
"Yun-fei",
""
]
] | [
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] |
802.2599 | Jonah Gollub | Jonah N. Gollub, Bijoy Kuanr, Zibigniew Celinski, Robert Camley, and
David R. Smith | Small dimensional microstrips embedded with ferromagnetic layers:
Numerical simulations and experimental results | 6 pages, 5 figures | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a numerical electromagnetic simulation software to investigate a
filtering device consisting of a small dimensional microstrips embedded with a
thin layer of ferromagnetic material and we compare our results to experimental
results. We are able to show good correlation of simulation versus experiment
for the magnitude of insertion loss and phase shift. The microstrips considered
have dimensions on the order of the skin depth of the conductor and hence the
field distribution is not easily calculated by analytic methods. We show that
numerical simulation methods provide an accurate means of characterizing these
structures.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 06:40:20 GMT"
}
] | "2008-02-20T00:00:00" | [
[
"Gollub",
"Jonah N.",
""
],
[
"Kuanr",
"Bijoy",
""
],
[
"Celinski",
"Zibigniew",
""
],
[
"Camley",
"Robert",
""
],
[
"Smith",
"David R.",
""
]
] | [
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] |
802.26 | Biao Wu | Biao Wu, Qi Zhang and Jie Liu | Anomalous Monopole In an Interacting Boson System | 4 pages, 3 figures | Phys. Lett. A375:545, 2011 | 10.1016/j.physleta.2010.12.030 | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anomalous monopole of disk shape is found to exist in the semiclassical
theory of a two-mode interacting boson system. The quantum origin of this
anomaly is the collapsing or bundling of field lines of Berry curvature caused
by the interaction between bosons in the semiclassical limit. The significance
of this anomalous monopole is twofold: (1) it signals the failure of the von
Neumann-Wigner theorem in the semiclassical limit; (2) it indicates a breakdown
of the correspondence principle between quantum and classical dynamics.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 07:20:05 GMT"
}
] | "2015-05-13T00:00:00" | [
[
"Wu",
"Biao",
""
],
[
"Zhang",
"Qi",
""
],
[
"Liu",
"Jie",
""
]
] | [
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] |
802.2601 | David Guery-Odelin | A. Couvert (LKB - Lhomond), M. Jeppesen (LKB - Lhomond), T. Kawalec
(LKB - Lhomond), G. Reinaudi (LKB - Lhomond), R. Mathevet (LCAR), David
Guery-Odelin (LKB - Lhomond, LCAR) | A quasi-monomode guided atom-laser from an all-optical Bose-Einstein
condensate | null | Europhys. Lett. 83 (2008) 50001 | 10.1209/0295-5075/83/50001 | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report the achievement of an optically guided and quasi-monomode atom
laser, in all spin projection states ($m_F =$ -1, 0 and $+1$) of F=1 in
Rubidium 87. The atom laser source is a Bose-Einstein condensate (BEC) in a
crossed dipole trap, purified to any one spin projection state by a
spin-distillation process applied during the evaporation to BEC. The atom laser
is outcoupled by an inhomogenous magnetic field, applied along the waveguide
axis. The mean excitation number in the transverse modes is $<n > = 0.65 \pm
0.05$ for $m_F = 0 $ and $<n > = 0.8 \pm 0.3$ for the low field seeker $m_F =
-1$.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 07:31:16 GMT"
},
{
"version": "v2",
"created": "Mon, 15 Sep 2008 10:19:30 GMT"
}
] | "2008-09-15T00:00:00" | [
[
"Couvert",
"A.",
"",
"LKB - Lhomond"
],
[
"Jeppesen",
"M.",
"",
"LKB - Lhomond"
],
[
"Kawalec",
"T.",
"",
"LKB - Lhomond"
],
[
"Reinaudi",
"G.",
"",
"LKB - Lhomond"
],
[
"Mathevet",
"R.",
"",
"LCAR"
],
[
"Guery-Odelin",
"David",
"",
"LKB - Lhomond, LCAR"
]
] | [
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] |
802.2602 | Romain Bachelard | Romain Bachelard (CPT), Cristel Chandre (CPT), Michel Vittot (CPT) | Hamiltonian description of a self-consistent interaction between charged
particles and electromagnetic waves | null | null | 10.1103/PhysRevE.78.036407 | null | physics.plasm-ph physics.optics | null | The Hamiltonian description of the self-consistent interaction between an
electromagnetic plane-wave and a co-propagating beam of charged particles is
considered. We show how the motion can be reduced to a one-dimensional
Hamiltonian model (in a canonical setting) from the Vlasov-Maxwell Poisson
brackets. The reduction to this paradigmatic Hamiltonian model is performed
using a Lie algebraic formalism which allows us to remain Hamiltonian at each
step of the derivation.
| [
{
"version": "v1",
"created": "Tue, 19 Feb 2008 07:31:54 GMT"
}
] | "2009-11-13T00:00:00" | [
[
"Bachelard",
"Romain",
"",
"CPT"
],
[
"Chandre",
"Cristel",
"",
"CPT"
],
[
"Vittot",
"Michel",
"",
"CPT"
]
] | [
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