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712.2879 | Augusta Abrahamse | Augusta Abrahamse, Andreas Albrecht, Michael Barnard, Brandon Bozek | Exploring Parameter Constraints on Quintessential Dark Energy: the
Pseudo-Nambu Goldstone Boson Model | 11 pages including 11 figures and 2 appendices | Phys.Rev.D77:103503,2008 | 10.1103/PhysRevD.77.103503 | null | astro-ph | null | We analyze the constraining power of future dark energy experiments for
Pseudo-Nambu Goldstone Boson (PNGB) quintessence. Following the Dark Energy
Task Force methodology, we forecast data for three experimental ``stages'':
Stage 2 represents in-progress projects relevant to dark energy; Stage 3 refers
to medium sized experiments; Stage 4 comprises larger projects. We determine
the posterior probability distribution for the parameters of the PNGB model
using Markov Chain Monte Carlo analysis. Utilizing data generated on a $\Lambda
CDM$ cosmology, we find that the relative power of the different data stages on
PNGB quintessence is roughly comparable to the DETF results for the $w_0-w_a$
parametrization of dark energy. We also generate data based on a PNGB
cosmological model that is consistent with a $\Lambda CDM$ fiducial model at
Stage 2. We find that Stage 4 data based on this PNGB fiducial model will rule
out a cosmological constant by at least $3 \sigma$.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 06:01:28 GMT"
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] | 2010-04-08T00:00:00 | [
[
"Abrahamse",
"Augusta",
""
],
[
"Albrecht",
"Andreas",
""
],
[
"Barnard",
"Michael",
""
],
[
"Bozek",
"Brandon",
""
]
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712.288 | Roberto Maiolino | R. Maiolino, T. Nagao, A. Grazian, F. Cocchia, A. Marconi, F.
Mannucci, A. Cimatti, A. Pipino, S. Ballero, A. Fontana, G.L. Granato, F.
Matteucci, G. Pastorini, L. Pentericci, G. Risaliti, M. Salvati, L. Silva | The evolution of the mass-metallicity relation at z~3 | 6 pages, 4 figures, to appear in the proceedings of "A Century of
Cosmology: Past, Present and Future" (Venezia, August 2007) | Nuovo Cim.B122:935-940,2007 | 10.1393/ncb/i2008-10424-y | null | astro-ph | null | We present preliminary results of an ESO-VLT large programme (AMAZE) aimed at
determining the evolution of the mass-metallicity relation at z~3 by means of
deep near-IR spectroscopy. Gas metallicities and stellar masses are measured
for an initial sample of nine star forming galaxies at z~3.3. When compared
with previous surveys, the mass-metallicity relation inferred at z~3.3 shows an
evolution significantly stronger than observed at lower redshifts. There are
also some indications that the metallicity evolution of low mass galaxies is
stronger relative to high mass systems, an effect which can be considered as
the chemical version of the galaxy downsizing. The mass-metallicity relation
observed at z~3.3 is difficult to reconcile with the predictions of some
hierarchical evolutionary models. We shortly discuss the possible implications
of such discrepancies.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 05:30:53 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Maiolino",
"R.",
""
],
[
"Nagao",
"T.",
""
],
[
"Grazian",
"A.",
""
],
[
"Cocchia",
"F.",
""
],
[
"Marconi",
"A.",
""
],
[
"Mannucci",
"F.",
""
],
[
"Cimatti",
"A.",
""
],
[
"Pipino",
"A.",
""
],
[
"Ballero",
"S.",
""
],
[
"Fontana",
"A.",
""
],
[
"Granato",
"G. L.",
""
],
[
"Matteucci",
"F.",
""
],
[
"Pastorini",
"G.",
""
],
[
"Pentericci",
"L.",
""
],
[
"Risaliti",
"G.",
""
],
[
"Salvati",
"M.",
""
],
[
"Silva",
"L.",
""
]
] | [
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712.2881 | Denes Petz | Denes Petz, V.E. Sandor Szabo | From quasi-entropy to skew information | 12 pages | null | null | null | math.FA math-ph math.MP math.ST stat.TH | null | This paper gives an overview about particular quasi-entropies, generalized
quantum covariances, quantum Fisher informations, skew-informations and their
relations. The point is the dependence on operator monotone functions. It is
proven that a skew-information is the Hessian of a quasi-entropy. The
skew-information and some inequalities are extended to a von Neumann algebra
setting.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 05:30:21 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Petz",
"Denes",
""
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[
"Szabo",
"V. E. Sandor",
""
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] |
712.2882 | Farhad Yusef-Zadeh | F. Yusef-Zadeh, M. Wardle, C. Heinke, C. D. Dowell, D. Roberts, F. K.
Baganoff and W. D. Cotton | Simultaneous Chandra, CSO and VLA Observations of Sgr A*: The Nature of
Flaring Activity | 28 pages, 9 figures, 2 tables, ApJ July 20, 2008 | null | 10.1086/588803 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sgr A*, the massive black hole at the center of the Galaxy, varies in radio
through X-ray emission on hourly time scales. The flare activity is thought to
arise from the innermost region of an accretion flow onto Sgr A*. We present
simultaneous light curves of Sgr A* in radio, sub-mm and X-rays that show a
possible time delay of 110$\pm17$ minutes between X-ray and 850 $\mu$m
suggesting that the sub-mm flare emission is optically thick. At radio
wavelengths, we detect time lags of of $20.4\pm6.8, 30\pm12$ and 20$\pm6$
minutes between the flare peaks observed at 13 and 7 mm (22 and 43 GHz) in
three different epochs using the VLA. Linear polarization of 1$\pm0.2$% and
0.7$\pm0.1$% is detected at 7 and 13 mm, respectively, when averaged over the
entire observation on 2006 July 17. A simple model of a bubble of synchrotron
emitting electrons cooling via adiabatic expansion can explain the time delay
between various wavelengths, the asymmetric shape of the light curves, and the
observed polarization of the flare emission at 43 and 22 GHz. The derived
physical quantities that characterize the emission give an expansion speed of
v$_{exp} \sim 0.003-0.1$c, magnetic field of B$\sim$10-70 Gauss and particle
spectral index p$\sim$1-2. These parameters suggest that the associated plasma
cannot escape from Sgr A* unless it has a large bulk motion.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 05:39:42 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jul 2008 09:08:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yusef-Zadeh",
"F.",
""
],
[
"Wardle",
"M.",
""
],
[
"Heinke",
"C.",
""
],
[
"Dowell",
"C. D.",
""
],
[
"Roberts",
"D.",
""
],
[
"Baganoff",
"F. K.",
""
],
[
"Cotton",
"W. D.",
""
]
] | [
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] |
712.2883 | Amanda Karakas | Amanda Karakas (ANU), Hye Young Lee (Argonne), Maria Lugaro (Utrecht),
Joachim Goerres (JINA, Notre Dame), Michael Wiescher (JINA, Notre Dame) | The impact of the 18F(a,p)21Ne reaction on asymptotic giant branch
nucleosynthesis | 9 pages, accepted for publication in ApJ | null | 10.1086/528840 | null | astro-ph | null | We present detailed models of low and intermediate-mass asymptotic giant
branch (AGB) stars with and without the 18F(a,p)21Ne reaction included in the
nuclear network, where the rate for this reaction has been recently
experimentally evaluated for the first time. The lower and recommended measured
rates for this reaction produce negligible changes to the stellar yields,
whereas the upper limit of the rate affects the production of 19F and 21Ne. The
stellar yields increase by ~50% to up to a factor of 4.5 for 19F, and by
factors of ~2 to 9.6 for 21Ne. While the 18}F(a,p)21Ne reaction competes with
18O production, the extra protons released are captured by 18O to facilitate
the 18O(p,a)15N(a,g)19F chain. The higher abundances of 19F obtained using the
upper limit of the rate helps to match the [F/O] ratios observed in AGB stars,
but only for large C/O ratios. Extra-mixing processes are proposed to help to
solve this problem. Some evidence that the 18F(a,p)21Ne rate might be closer to
its upper limit is provided by the fact that the higher calculated 21Ne/22Ne
ratios in the He intershell provide an explanation for the Ne isotopic
composition of silicon-carbide grains from AGB stars. This needs to be
confirmed by future experiments of the 18F(a,p)21Ne reaction rate. The
availability of accurate fluorine yields from AGB stars will be fundamental for
interpreting observations of this element in carbon-enhanced metal-poor stars.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 05:41:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Karakas",
"Amanda",
"",
"ANU"
],
[
"Lee",
"Hye Young",
"",
"Argonne"
],
[
"Lugaro",
"Maria",
"",
"Utrecht"
],
[
"Goerres",
"Joachim",
"",
"JINA, Notre Dame"
],
[
"Wiescher",
"Michael",
"",
"JINA, Notre Dame"
]
] | [
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] |
712.2884 | Brandon Bozek | Brandon Bozek, Augusta Abrahamse, Andreas Albrecht, and Michael
Barnard | Exploring Parameter Constraints on Quintessential Dark Energy: The
Exponential Model | 11 pages including 10 figures | Phys.Rev.D77:103504,2008 | 10.1103/PhysRevD.77.103504 | null | astro-ph | null | We present an analysis of a scalar field model of dark energy with an
exponential potential using the Dark Energy Task Force (DETF) simulated data
models. Using Markov Chain Monte Carlo sampling techniques we examine the
ability of each simulated data set to constrain the parameter space of the
exponential potential for data sets based on a cosmological constant and a
specific exponential scalar field model. We compare our results with the
constraining power calculated by the DETF using their ``$w_0-w_a$''
parametrization of the dark energy. We find that respective increases in
constraining power from one stage to the next produced by our analysis give
results consistent with DETF results. To further investigate the potential
impact of future experiments, we also generate simulated data for an
exponential model background cosmology which can not be distinguished from a
cosmological constant at DETF ``Stage 2'', and show that for this cosmology
good DETF Stage 4 data would exclude a cosmological constant by better than
3$\sigma$.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 05:46:46 GMT"
}
] | 2010-04-08T00:00:00 | [
[
"Bozek",
"Brandon",
""
],
[
"Abrahamse",
"Augusta",
""
],
[
"Albrecht",
"Andreas",
""
],
[
"Barnard",
"Michael",
""
]
] | [
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] |
712.2885 | Marco Ajello | M. Ajello, J. Greiner, G. Kanbach, A. Rau, A. W. Strong, and J. A.
Kennea | BAT X-ray Survey - I: Methodology and X-ray Identification | 35 pages, 10 figures, Accepted for publication in ApJ. 1st paper in a
series of three | null | 10.1086/529418 | null | astro-ph | null | We applied the Maximum Likelihood method, as an image reconstruction
algorithm, to the BAT X-ray Survey (BXS). This method was specifically designed
to preserve the full statistical information in the data and to avoid
mosaicking of many exposures with different pointing directions, thus reducing
systematic errors when co-adding images. We reconstructed, in the 14-170 keV
energy band, the image of a 90x90 deg$^2$ sky region, centered on
(RA,DEC)=105$^{\circ}$,-25$^{\circ}$, which BAT surveyed with an exposure time
of $\sim1$ Ms (in Nov. 2005). The best sensitivity in our image is $\sim0.85$
mCrab or $2.0\times 10^{-11}$ erg cm$^{-2}$. We detect 49 hard X-ray sources
above the 4.5 $\sigma$ level; of these, only 12 were previously known as hard
X-ray sources ($>$15 keV). Swift/XRT observations allowed us to firmly identify
the counterparts for 15 objects, while 2 objects have Einstein IPC counterparts
\citep{harris90}; in addition to those, we found a likely counterpart for 13
objects by correlating our sample with the ROSAT All-Sky Survey Bright Source
Catalog \citep{voges99}. 7 objects remain unidentified. Analysis of the noise
properties of our image shows that $\sim75$% of the area is surveyed to a flux
limit of $\sim$1 mCrab. This study shows that the coupling of the Maximum
Likelihood method to the most sensitive, all-sky surveying, hard X-ray
instrument, BAT, is able to probe for the first time the hard X-ray sky to the
mCrab flux level. The successful application of this method to BAT demonstrates
that it could also be applied with advantage to similar instruments like
INTEGRAL-IBIS.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 05:53:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ajello",
"M.",
""
],
[
"Greiner",
"J.",
""
],
[
"Kanbach",
"G.",
""
],
[
"Rau",
"A.",
""
],
[
"Strong",
"A. W.",
""
],
[
"Kennea",
"J. A.",
""
]
] | [
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712.2886 | Vishnu Bannur M | Vishnu M. Bannur | Self-consistent quasiparticle model for 2, 3 and (2+1) flavor QGP | 9 pages, 7 figures, article | Phys.Rev.C78:045206,2008 | 10.1103/PhysRevC.78.045206 | null | hep-ph | null | Quasi-particle model of quark gluon plasma is the statistical mechanics of
particles with medium dependent mass, related to plasma frequency, which was
proposed to describe the thermodynamics of the medium itself. At relativistic
limit the plasma frequency depends on number density and temperature. The
number density is a thermodynamic quantity of the medium which in turn depends
on plasma frequency. Hence, one need to solve this problem self-consistently,
instead of using perturbative expressions for plasma frequency. Here we carry
out such a self-consistent calculations using our, recently developed, a new
formulations of quasiparticle model. By adjusting a single parameter for each
system, a remarkably good fit to lattice QCD results are obtained for 2, 3 and
(2+1) flavor quark gluon plasma systems, first, with zero chemical potential.
Then, it is extended to systems with finite chemical potential and fits very
well the lattice results without any new parameter.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 06:32:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bannur",
"Vishnu M.",
""
]
] | [
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] |
712.2887 | Pablo A. Parrilo | Pablo A. Parrilo, Ali Jadbabaie | Approximation of the joint spectral radius using sum of squares | 18 pages, 1 figure | Linear Algebra and its Applications, Vol. 428, No. 10, pp.
2385-2402, 2008. | 10.1016/j.laa.2007.12.027 | null | math.OC | null | We provide an asymptotically tight, computationally efficient approximation
of the joint spectral radius of a set of matrices using sum of squares (SOS)
programming. The approach is based on a search for an SOS polynomial that
proves simultaneous contractibility of a finite set of matrices. We provide a
bound on the quality of the approximation that unifies several earlier results
and is independent of the number of matrices. Additionally, we present a
comparison between our approximation scheme and earlier techniques, including
the use of common quadratic Lyapunov functions and a method based on matrix
liftings. Theoretical results and numerical investigations show that our
approach yields tighter approximations.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 06:43:12 GMT"
}
] | 2008-03-23T00:00:00 | [
[
"Parrilo",
"Pablo A.",
""
],
[
"Jadbabaie",
"Ali",
""
]
] | [
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] |
712.2888 | David Poulin | David Poulin, Jean-Pierre Tillich, and Harold Ollivier | Quantum serial turbo-codes | 24 pages, 15 figures, Published version | IEEE Transactions on Information Theory 55, p. 2776 (2009) | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a theory of quantum serial turbo-codes, describe their iterative
decoding algorithm, and study their performances numerically on a
depolarization channel. Our construction offers several advantages over quantum
LDPC codes. First, the Tanner graph used for decoding is free of 4-cycles that
deteriorate the performances of iterative decoding. Secondly, the iterative
decoder makes explicit use of the code's degeneracy. Finally, there is complete
freedom in the code design in terms of length, rate, memory size, and
interleaver choice.
We define a quantum analogue of a state diagram that provides an efficient
way to verify the properties of a quantum convolutional code, and in particular
its recursiveness and the presence of catastrophic error propagation. We prove
that all recursive quantum convolutional encoder have catastrophic error
propagation. In our constructions, the convolutional codes have thus been
chosen to be non-catastrophic and non-recursive. While the resulting families
of turbo-codes have bounded minimum distance, from a pragmatic point of view
the effective minimum distances of the codes that we have simulated are large
enough not to degrade the iterative decoding performance up to reasonable word
error rates and block sizes. With well chosen constituent convolutional codes,
we observe an important reduction of the word error rate as the code length
increases.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 06:50:52 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Jun 2009 13:09:01 GMT"
}
] | 2009-06-10T00:00:00 | [
[
"Poulin",
"David",
""
],
[
"Tillich",
"Jean-Pierre",
""
],
[
"Ollivier",
"Harold",
""
]
] | [
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] |
712.2889 | Yu-Feng Zhou | Yue-Liang Wu, Yu-Feng Zhou and Ci Zhuang | Constraining Charming Penguins in Charmless B Decays | 22 pages, 6 figures, references added | J.Phys.G37:025006,2010 | 10.1088/0954-3899/37/2/025006 | KIAS-P07092 | hep-ph | null | We discuss the correlations of charming penguin contributions to
$B\to\pi\pi$, $\pi K$ and KK using approximate flavor SU(3) symmetry. Strong
constraints are found from the direct CP asymmetries especially in $\pi K$
modes. We make a global fit to the latest data and find that only a small
charming penguin is allowed, and the size of color-suppressed tree amplitude
(C) relative to tree amplitudes (T) remains large $C/T\simeq0.6$, which
disfavors the possibility of a large charming penguin as an explanation for the
$\pi\pi$ puzzle. We show that a small charming penguin can still have sizable
effect in the time-dependence CP asymmetries in KK mode.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 07:33:31 GMT"
},
{
"version": "v2",
"created": "Sun, 23 Dec 2007 07:54:01 GMT"
}
] | 2010-01-21T00:00:00 | [
[
"Wu",
"Yue-Liang",
""
],
[
"Zhou",
"Yu-Feng",
""
],
[
"Zhuang",
"Ci",
""
]
] | [
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] |
712.289 | Levshakov | S.A. Levshakov, D. Reimers, M.G. Kozlov, S.G. Porsev, P. Molaro | A new approach for testing variations of fundamental constants over
cosmic epochs using FIR fine-structure lines | 5 pages, to appear in A&A main journal | Astron. & Astrophys, 479, 719 (2008) | 10.1051/0004-6361:20079116 | null | astro-ph physics.atom-ph | null | Aims. To obtain limits on the variation of the fine-structure constant alpha
and the electron-to-proton mass ratio mu over different cosmological epochs.
Methods. A new approach based on the comparison of redshifts of far infrared
(FIR) fine-structure lines and low-lying rotational transitions in CO is
proposed which is in principle more sensitive by a factor of 10 compared to QSO
metal absorption lines. Results. Estimations of the quotient F = alpha^2/mu
obtained for two distant quasars J1148+5251 (z = 6.42) and BR1202-0725 (z =
4.69) provide Delta F/F = (0.1+/-1.0)10^{-4} and (1.4+/-1.5)10^{-4},
respectively. The obtained limits are consistent with no variation of physical
constants at the level of 0.01% over a period of 13 Gyr. Conclusions. Upcoming
observations of quasars and distant galaxies in FIR fine-structure lines of
different species and in CO low rotational lines at the SOFIA, HSO, and ALMA
are expected to improve the current limit by, at least, an order of magnitude.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 07:33:15 GMT"
}
] | 2009-09-01T00:00:00 | [
[
"Levshakov",
"S. A.",
""
],
[
"Reimers",
"D.",
""
],
[
"Kozlov",
"M. G.",
""
],
[
"Porsev",
"S. G.",
""
],
[
"Molaro",
"P.",
""
]
] | [
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712.2891 | Farrukh Mukhamedov M. | Farrukh Mukhamedov, Mansoor Saburov | On homotopy of volterrian quadratic stochastic operators | 12 pages | null | null | null | math.DS math.FA | null | In the present paper we introduce a notion of homotopy of two Volterra
operators which is related to fixed points of such operators. It is establish a
criterion when two Volterra operators are homotopic, as a consequence we obtain
that the corresponding tournaments of that operators are the same. This, due to
\cite{Ga1}, gives us a possibility to know some information about the
trajectory of homotopic Volterra operators. Moreover, it is shown that any
Volterra q.s.o. given on a face has at least two homotopic extension to the
whole simplex.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 07:39:14 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Mukhamedov",
"Farrukh",
""
],
[
"Saburov",
"Mansoor",
""
]
] | [
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] |
712.2892 | Tomohito Morita | Tomohito Morita | Hilbert schemes of finite abelian group orbits and Grobner fans | 13 pages, 3 figures | null | null | null | math.AG math.AC | null | Let $G$ be a finite abelian subgroup of
$PGL(r-1,K)=\mathrm{Aut}(\P^{r-1}_K)$. In this paper, we prove that the
normalization of the $G$-orbit Hilbert scheme $\Hilb^G(\P^{r-1})$ is described
as a toric variety, which corresponds to the Gr\"obner fan for some homogeneous
ideal $I$ of $K[x_1, ..., x_r]$.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 07:41:29 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Morita",
"Tomohito",
""
]
] | [
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] |
712.2893 | Sebastiano Pennisi | M.C. Carrisi, M.A. Mele, S. Pennisi | Extended Thermodynamics for dense gases and macromolecular fluids,
obtained through a non relativistic limit | null | null | null | null | math-ph math.MP | null | In this paper we consider the 14 moments model of Extended Thermodynamics for
dense gases and macromolecular fluids. Solutions of the restrictions imposed by
the entropy principle and that of Galilean relativity for such a model have
been until now obtained in literature only in an approximate manner up to a
certain order with respect to thermodynamic equilibrium; for more restrictive
models they have been obtained up to whatever order, but by using Taylor
expansions around equilibrium and without proving convergence. Here we have
found an exact solution without using expansions. The idea has been to write
firstly a relativistic model, for which it is easy to impose the Einsteinian
relativity principle, and then taking its non relativistic limit.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 07:51:09 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Carrisi",
"M. C.",
""
],
[
"Mele",
"M. A.",
""
],
[
"Pennisi",
"S.",
""
]
] | [
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] |
712.2894 | Sergey Kozyrev | S.M.Kozyrev | A D-dimensional Heckmann-like solution of Jordan-Brans-Dicke theory | 5 pages | null | null | null | gr-qc | null | In this short letter we present a some rigorous vacuum solutions of the
D-dimensional Jordan-Brans-Dicke field equations. In contrast with the well
known Brans-Dicke solutions, to the search of static and spherically symmetric
space-time we choose the widespread Hilbert coordinates.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:02:04 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Kozyrev",
"S. M.",
""
]
] | [
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] |
712.2895 | Ansgar Denner | Mariano Ciccolini, Ansgar Denner, Stefan Dittmaier | Electroweak and QCD corrections to Higgs-boson production in
vector-boson fusion at the LHC | 6 pages, LaTeX, 4 postscript figures, to appear in the proceedings of
the "8th International Symposium on Radiative Corrections (RADCOR07)",
Florence, Italy, October 1-5, 2007 | PoSRADCOR2007:014,2007 | null | MPP-2007-190, PSI-PR-07-12, UWThPh-2007-29 | hep-ph | null | Radiative corrections of strong and electroweak interactions are presented at
next-to-leading order for Higgs-boson production in the weak-boson-fusion
channel at the LHC. The calculation includes all weak-boson fusion and
quark-antiquark annihilation diagrams as well as all related interferences. The
electroweak corrections, which also include real corrections from incoming
photons and leading heavy-Higgs-boson effects at two-loop order, are of the
same size as the QCD corrections, viz. typically at the level of 5-10% for a
Higgs-boson mass up to \sim 700 GeV. In general, they do not simply rescale
differential distributions, but induce distortions at the level of 10%. The
discussed corrections have been implemented in a flexible Monte Carlo event
generator.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:05:26 GMT"
}
] | 2009-04-14T00:00:00 | [
[
"Ciccolini",
"Mariano",
""
],
[
"Denner",
"Ansgar",
""
],
[
"Dittmaier",
"Stefan",
""
]
] | [
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] |
712.2896 | Dr A. N. Mitra | A. N. Mitra | Dynamics Of Proton Spin : Role Of $qqq$ Force | tex file, 18 pp on dvi | null | null | null | hep-ph | null | The analytic structure of the $qqq$ wave function, obtained recently in the
high momentum regime of QCD, is employed for the formulation of baryonic
transition amplitudes via quark loops. A new aspect of this study is the role
of a direct ($Y$-shaped, Mercedes-Benz type) $qqq$ force in generating the
$qqq$ wave function. The dynamics is that of a Salpeter-like equation (3D
support for the kernel) formulated covariantly on the light front, a la
Markov-Yukawa Transversality Principle (MYTP) which warrants a 2-way
interconnection between the 3D and 4D Bethe-Salpeter (BSE) forms for 2 as well
as 3 fermion quarks. The dynamics of this 3-body force shows up through a
characteristic singularity in the hypergeometric differential equation for the
3D wave function $\phi$, corresponding to a $negative$ eigenvalue of the spin
operator $i \sigma_1.\sigma_2\times \sigma_3$ which is an integral part of the
$qqq$ force. As a first application of this wave function to the problem of the
proton spin anomaly, the two-gluon contribution to the anomaly yields an
estimate of the right sign, although somewhat smaller in magnitude.
Keywords: 3bodyforce; proton-spin; 2gluon anomaly; fractional correction
$\theta$
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:12:22 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Mitra",
"A. N.",
""
]
] | [
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] |
712.2897 | Young-Woo Son | Seungchul Kim, Jisoon Ihm, Hyoung Joon Choi, Young-Woo Son | Origins of anomalous electronic structures of epitaxial graphene on
silicon carbide | Additional references added; published version; 4 pages, 4 figures | Phys. Rev. Lett. 100, 176802 (2008) | 10.1103/PhysRevLett.100.176802 | null | cond-mat.mtrl-sci cond-mat.mes-hall | null | On the basis of first-principles calculations, we report that a novel
interfacial atomic structure occurs between graphene and the surface of silicon
carbide, destroying the Dirac point of graphene and opening a substantial
energy gap there. In the calculated atomic structures, a quasi-periodic
$6\times 6$ domain pattern emerges out of a larger commensurate
$6\sqrt{3}\times6\sqrt{3}R30^\circ$ periodic interfacial reconstruction,
resolving a long standing experimental controversy on the periodicity of the
interfacial superstructures. Our theoretical energy spectrum shows a gap and
midgap states at the Dirac point of graphene, which are in excellent agreement
with the recently-observed anomalous angle-resolved photoemission spectra.
Beyond solving unexplained issues of epitaxial graphene, our atomistic study
may provide a way to engineer the energy gaps of graphene on substrates.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:27:21 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Apr 2008 23:50:40 GMT"
}
] | 2008-04-30T00:00:00 | [
[
"Kim",
"Seungchul",
""
],
[
"Ihm",
"Jisoon",
""
],
[
"Choi",
"Hyoung Joon",
""
],
[
"Son",
"Young-Woo",
""
]
] | [
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] |
712.2898 | Eyer Laurent | P.G. Willemsen, L. Eyer | A study of supervised classification of Hipparcos variable stars using
PCA and Support Vector Machines | null | null | null | VSWG-PW-001, 2005 | astro-ph | null | We report on the automated classification of Hipparcos variable stars by a
supervised classification algorithm known as Support Vector Machines. The
dataset comprised about 3200 stars, each characterized by 51 features. These
are the B-V and V-I colours, the skewness of the lightcurve, the median
subtracted 10-percentiles and forty bins from the Fourier envelope of the
lightcurve. We also tested whether the classification performance can be
improved by using the most significant principal components calculated from
this dataset. We show that the overall classification performance (as measured
by the fraction of true positives) on the original dataset is of the order of
62%. For about 9 of the 18 different variability classes, the classification
accuracy is significantly larger than 60% (up to 98%). Introducing principal
components does not significantly improve this result. We further find that
many of the different variability classes are not very distinct and possibly
poorly defined, i.e. there exists a considerable class overlap. It is concluded
that this `contamination' of the template set implies minimum errors and thus
degrades the overall performance.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:32:22 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Willemsen",
"P. G.",
""
],
[
"Eyer",
"L.",
""
]
] | [
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] |
712.2899 | Ying-Ji He | Y. J. He, Boris A. Malomed, and H. Z. Wang | Fusion of necklace-ring patterns into vortex and fundamental solitons in
dissipative media | 4 figures | published in Optics Express 15, 17501-17508 (2007) | 10.1364/OE.15.017502 | null | nlin.PS | null | We demonstrate that necklace-shaped arrays of localized spatial beams can
merge into stable fundamental or vortex solitons in a generic model of laser
cavities, based on the two-dimensional complex Ginzburg-Landau equation with
the cubic-quintic nonlinearity. The outcome of the fusion is controlled by the
number of beads in the initial necklace, 2N, and its topological charge, M. We
predict and confirm by systematic simulations that the vorticity of the
emerging soliton is the absolute value of difference of N and M. Threshold
characteristics of the fusion are found and explained too. If the initial
radius of the array (R0) is too large, it simply keeps the necklace shape (if
R0 is somewhat smaller, the necklace features a partial fusion), while, if R0
is too small, the array disappears.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:34:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"He",
"Y. J.",
""
],
[
"Malomed",
"Boris A.",
""
],
[
"Wang",
"H. Z.",
""
]
] | [
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] |
712.29 | Vsevolod Adler | V.E. Adler | Classification of integrable Volterra type lattices on the sphere.
Isotropic case | 16 pages | J. Phys. A: Math. Theor. 41 (2008) 145201 | 10.1088/1751-8113/41/14/145201 | null | nlin.SI | null | The symmetry approach is used for classification of integrable isotropic
vector Volterra lattices on the sphere. The list of integrable lattices
consists mainly of new equations. Their symplectic structure and associated PDE
of vector NLS-type are discussed.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:51:57 GMT"
}
] | 2012-09-13T00:00:00 | [
[
"Adler",
"V. E.",
""
]
] | [
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712.2901 | Yoav Tsori | Gilad Marcus, Sela Samin, Yoav Tsori | Phase-Separation Transition in Liquid Mixtures Near Charged Objects | final version, includes small changes and typo corrections | J. Chem. Phy. vol 129, 061101 (2008) | 10.1063/1.2965906 | null | cond-mat.stat-mech cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamic behavior of nonpolar liquid mixtures in the
vicinity of curved charged objects, such as electrodes or charged colloids. For
small enough charge on the object, or equivalently, small potential, the
dielectrophoretic force leads to enrichment of the more polar liquid close the
colloid. However, there is a critical value of charge (or potential), above
which a phase-separation transition occurs, and the interface between high- and
low-dielectric constant components becomes sharp. Analytical and numerical
composition profile are given, and the equilibrium front location as a function
of charge or voltage is found. We further employ a simple Cahn-Hilliard type
equation to study the dynamics of phase-separation in spatially nonuniform
electric fields. We find an exponential relaxation of the composition front
location, with a characteristic time depending on the charge, mixture
composition and ambient temperature.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:50:49 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Aug 2008 08:13:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marcus",
"Gilad",
""
],
[
"Samin",
"Sela",
""
],
[
"Tsori",
"Yoav",
""
]
] | [
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] |
712.2902 | Frank M. Rieger | F.M. Rieger, F.A. Aharonian | Variable VHE gamma-ray emission from non-blazar AGNs | 4 pages, A&A Letters; typos (r_l) fixed, Journal ref. added | A&A 479 (2008), L5 | 10.1051/0004-6361:20078706 | null | astro-ph | null | The observation of rapidly variable very high energy (VHE) gamma-rays from
non-aligned active galactic nuclei (AGNs), as reported from M87, proves
challenging for conventional theoretical acceleration and emission models. We
re-examine the centrifugal acceleration of particles by rotating jet
magnetospheres in the vicinity of accreting supermassive black hole systems and
analyze the energy constraints imposed for highly underluminous systems.
Applications are presented for conditions expected to be present in the radio
galaxy M87, assuming accretion onto the central black hole to occur in an
advection-dominated (ADAF) mode. We show that for a highly underluminous source
like M87, centrifugally accelerated electrons may reach Lorentz factors up to
$\gamma \sim (10^7-10^8)$, allowing inverse Compton (Thomson) upscattering of
sub-mm disk photons to the TeV regime. Upscattering of Comptonized disk photons
results in a flat TeV spectrum $L_{\nu} \propto \nu^{-\alpha_c}$ with spectral
index $\alpha_c \simeq 1.2$. The characteristic variability time scale is of
the order $r_{\rm L}/c$, which in the case of M87 corresponds to $\simeq 1.7$ d
for a typical light cylinder radius of $r_{\rm L} \simeq 5 r_{\rm s}$.
Centrifugal acceleration could thus provide a natural explanation for the
challenging VHE emission features in M87. Our results suggest that some
advection-dominated accreting (non-blazar) AGNs could well be observable VHE
emitting sources. (abridged)
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:56:43 GMT"
},
{
"version": "v2",
"created": "Tue, 27 May 2008 09:51:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rieger",
"F. M.",
""
],
[
"Aharonian",
"F. A.",
""
]
] | [
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] |
712.2903 | Vyacheslav Rychkov | Riccardo Barbieri, Lawrence J. Hall, Anastasios Y. Papaioannou, Duccio
Pappadopulo, Vyacheslav S. Rychkov | An alternative NMSSM phenomenology with manifest perturbative
unification | 19 pages, 13 figures; v2: possibility of pseudo-Goldstone below 2m_b
threshold added, version published by JHEP | JHEP0803:005,2008 | 10.1088/1126-6708/2008/03/005 | UCB-PTH-06/04 | hep-ph | null | Can supersymmetric models with a moderate stop mass be made consistent with
the negative Higgs boson searches at LEP, while keeping perturbative
unification manifest? The NMSSM achieves this rather easily, but only if extra
matter multiplets filling complete SU(5) representations are present at
intermediate energies. As a concrete example which makes use of this feature,
we give an analytic description of the phenomenology of a constrained NMSSM
close to a Peccei-Quinn symmetry point. The related pseudo-Goldstone boson
appears in decays of the Higgs bosons and possibly of the lightest neutralino,
and itself decays into (b anti-b) and (tau anti-tau).
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:29:52 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Mar 2008 12:26:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Hall",
"Lawrence J.",
""
],
[
"Papaioannou",
"Anastasios Y.",
""
],
[
"Pappadopulo",
"Duccio",
""
],
[
"Rychkov",
"Vyacheslav S.",
""
]
] | [
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] |
712.2904 | Dimitri Shlyakhtenko | A. Guionnet, V.F.R. Jones, D. Shlyakhtenko | Random matrices, free probability, planar algebras and subfactors | Minor changes | null | null | null | math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a family of graded algebra structures on a planar algebra and a family
of traces coming from random matrix theory, we obtain a tower of
non-commutative probability spaces, naturally associated to a given planar
algebra. The associated von Neumann algebras are II$_{1}$ factors whose
inclusions realize the given planar algebra as a system of higher relative
commutants. We thus give an alternative proof to a result of Popa that every
planar algebra can be realized by a subfactor.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 08:58:13 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jul 2008 19:10:41 GMT"
}
] | 2008-07-08T00:00:00 | [
[
"Guionnet",
"A.",
""
],
[
"Jones",
"V. F. R.",
""
],
[
"Shlyakhtenko",
"D.",
""
]
] | [
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712.2905 | Jasjeet Singh Bagla | J. S. Bagla (HRI, Allahabad), Jaswant Yadav, T. R. Seshadri (Dept. of
Physics and Astrophysics, University of Delhi) | Fractal Dimensions of a Weakly Clustered Distribution and the Scale of
Homogeneity | 10 pages, 5 figures. accepted for publication in the MNRAS | Mon.Not.Roy.Astron.Soc.390:829,2007 | 10.1111/j.1365-2966.2008.13793.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Homogeneity and isotropy of the universe at sufficiently large scales is a
fundamental premise on which modern cosmology is based. Fractal dimensions of
matter distribution is a parameter that can be used to test the hypothesis of
homogeneity. In this method, galaxies are used as tracers of the distribution
of matter and samples derived from various galaxy redshift surveys have been
used to determine the scale of homogeneity in the Universe. Ideally, for
homogeneity, the distribution should be a mono-fractal with the fractal
dimension equal to the ambient dimension. While this ideal definition is true
for infinitely large point sets, this may not be realised as in practice, we
have only a finite point set. The correct benchmark for realistic data sets is
a homogeneous distribution of a finite number of points and this should be used
in place of the mathematically defined fractal dimension for infinite number of
points (D) as a requirement for approach towards homogeneity. We derive the
expected fractal dimension for a homogeneous distribution of a finite number of
points. We show that for sufficiently large data sets the expected fractal
dimension approaches D in absence of clustering. It is also important to take
the weak, but non-zero amplitude of clustering at very large scales into
account. In this paper we also compute the expected fractal dimension for a
finite point set that is weakly clustered. Clustering introduces departures in
the Fractal dimensions from D and in most situations the departures are small
if the amplitude of clustering is small. Features in the two point correlation
function, like those introduced by Baryon Acoustic Oscillations (BAO) can lead
to non-trivial variations in the Fractal dimensions where the amplitude of
clustering and deviations from D are no longer related in a monotonic manner.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:26:10 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Jan 2008 04:06:28 GMT"
},
{
"version": "v3",
"created": "Mon, 4 Aug 2008 08:04:48 GMT"
}
] | 2009-09-10T00:00:00 | [
[
"Bagla",
"J. S.",
"",
"HRI, Allahabad"
],
[
"Yadav",
"Jaswant",
"",
"Dept. of\n Physics and Astrophysics, University of Delhi"
],
[
"Seshadri",
"T. R.",
"",
"Dept. of\n Physics and Astrophysics, University of Delhi"
]
] | [
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] |
712.2906 | Akihisa Hayashi | Y. Ishida, T. Hashimoto, M. Horibe, and A. Hayashi | Local Quantum Pure-state Identification without Classical Knowledge | 5 pages, no figures; v2: reference added, representation improved | null | null | null | quant-ph | null | Suppose we want to distinguish two quantum pure states. We consider the case
in which no classical knowledge on the two states is given and only a pair of
samples of the two states is available. This problem is called quantum
pure-state identification problem. Our task is to optimize the mean
identification success probability, which is averaged over an independent
unitary invariant distribution of the two reference states. In this paper, the
two states are assumed bipartite states which are generally entangled. The
question is whether the maximum mean identification success probability can be
attained by means of an LOCC (Local Operations and Classical Communication)
measurement scheme. We will show that this is possible by constructing a POVM
which respects the conditions of LOCC.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:26:34 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 02:36:34 GMT"
}
] | 2008-01-07T00:00:00 | [
[
"Ishida",
"Y.",
""
],
[
"Hashimoto",
"T.",
""
],
[
"Horibe",
"M.",
""
],
[
"Hayashi",
"A.",
""
]
] | [
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] |
712.2907 | Mariusz Krawiec | T. Kwapinski, M. Krawiec, M. Jalochowski | STM tunneling through a quantum wire with a side-attached impurity | 16 pages, 6 figures | Phys. Lett. A372, 154 (2008) | 10.1016/j.physleta.2007.08.017 | null | cond-mat.mes-hall | null | The STM tunneling through a quantum wire (QW) with a side-attached impurity
(atom, island) is investigated using a tight-binding model and the
nonequilibrium Keldysh Green function method. The impurity can be coupled to
one or more QW atoms. The presence of the impurity strongly modifies the local
density of states of the wire atoms, thus influences the STM tunneling through
all the wire atoms. The transport properties of the impurity itself are also
investigated mainly as a function of the wire length and the way it is coupled
to the wire. It is shown that the properties of the impurity itself and the way
it is coupled to the wire strongly influence the STM tunneling which is
reflected in the density of states and differential conductance.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:27:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kwapinski",
"T.",
""
],
[
"Krawiec",
"M.",
""
],
[
"Jalochowski",
"M.",
""
]
] | [
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712.2908 | Dirk Oliver Theis | Dirk Oliver Theis | The Cops & Robber game on series-parallel graphs | short communication (final draft, small changes) | null | null | null | math.CO | null | The Cops and Robber game is played on undirected finite graphs. $k$ cops and
one robber are positioned on vertices and take turn in moving along edges. The
cops win if, after a move, a cop and the robber are on the same vertex. A graph
is called $k$-copwin, if the cops have a winning strategy.
It is known that planar graphs are 3-copwin (Aigner & Fromme, 1984) and that
outerplanar graphs are 2-copwin (Clarke, 2002). In this short note, we prove
that series-parallel (i.e., graphs with no $K_4$ minor) graphs are 2-copwin.
It is a well-known trick in the literature of cops & robber games to define
variants of the game which impose restrictions on the possible strategies of
the cops (see Clarke, 2002). For our proof, we define the ``cops & robber game
with exits''.
Our proof yields a winning strategy for the cops.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:46:07 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 15:28:56 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Theis",
"Dirk Oliver",
""
]
] | [
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] |
712.2909 | Friedrich Wyrowski | Friedrich Wyrowski | Initial conditions for massive star formation | 12 pages, 1 figure, submitted proceedings contribution for "Massive
Star Formation: Observations confront Theory" (Heidelberg 2007) | null | null | null | astro-ph | null | In this contribution, our knowledge of the initial conditions under which
massive star formation takes place is reviewed. Massive stars are born in
massive clumps of giant molecular clouds (GMCs), hence first the properties of
GMCs are summarized. As a potentially early stage of molecular clouds, infrared
dark clouds have been discovered a decade ago as dark patches in mid-infrared
(MIR) images of the Galactic plane and many studies of the physical conditions
within them have been conducted recently. Without the guidance of MIR
absorption, large scale, unbiased cold dust surveys can be used as well to
identify massive cold clumps. In the absence of indicators of ongoing massive
star formation, like compact HII regions and bright IR sources, these clumps
are the most promising objects for the study of the initial conditions of
massive star formation. Current observational approaches to find IR quiet
clumps and their physical and chemical properties are summarized.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:54:38 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Wyrowski",
"Friedrich",
""
]
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] |
712.291 | Marco Bartolozzi Dr | M. Bartolozzi, C. Mellen, F. Chan, D. Oliver, T. Di Matteo, T. Aste | Applications of physical methods in high-frequency futures markets | 14 Pages and 10 figures. Proceeding to the SPIE conference, 4 - 7
December 2007 Australian National Univ. Canberra, ACT, Australia | null | 10.1117/12.758431 | null | q-fin.TR physics.data-an physics.soc-ph | null | In the present work we demonstrate the application of different physical
methods to high-frequency or tick-by-tick financial time series data. In
particular, we calculate the Hurst exponent and inverse statistics for the
price time series taken from a range of futures indices. Additionally, we show
that in a limit order book the relaxation times of an imbalanced book state
with more demand or supply can be described by stretched exponential laws
analogous to those seen in many physical systems.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:46:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bartolozzi",
"M.",
""
],
[
"Mellen",
"C.",
""
],
[
"Chan",
"F.",
""
],
[
"Oliver",
"D.",
""
],
[
"Di Matteo",
"T.",
""
],
[
"Aste",
"T.",
""
]
] | [
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] |
712.2911 | Lewin Mathieu | Philippe Gravejat, Mathieu Lewin and Eric Sere | Ground State and Charge Renormalization in a Nonlinear Model of
Relativistic Atoms | 37 pages, 1 figure | null | 10.1007/s00220-008-0660-9 | null | math-ph math.MP | null | We study the reduced Bogoliubov-Dirac-Fock (BDF) energy which allows to
describe relativistic electrons interacting with the Dirac sea, in an external
electrostatic potential. The model can be seen as a mean-field approximation of
Quantum Electrodynamics (QED) where photons and the so-called exchange term are
neglected. A state of the system is described by its one-body density matrix,
an infinite rank self-adjoint operator which is a compact perturbation of the
negative spectral projector of the free Dirac operator (the Dirac sea).
We study the minimization of the reduced BDF energy under a charge
constraint. We prove the existence of minimizers for a large range of values of
the charge, and any positive value of the coupling constant $\alpha$. Our
result covers neutral and positively charged molecules, provided that the
positive charge is not large enough to create electron-positron pairs. We also
prove that the density of any minimizer is an $L^1$ function and compute the
effective charge of the system, recovering the usual renormalization of charge:
the physical coupling constant is related to $\alpha$ by the formula
$\alpha_{\rm phys}\simeq \alpha(1+2\alpha/(3\pi)\log\Lambda)^{-1}$, where
$\Lambda$ is the ultraviolet cut-off. We eventually prove an estimate on the
highest number of electrons which can be bound by a nucleus of charge $Z$. In
the nonrelativistic limit, we obtain that this number is $\leq 2Z$, recovering
a result of Lieb.
This work is based on a series of papers by Hainzl, Lewin, Sere and Solovej
on the mean-field approximation of no-photon QED.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:53:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gravejat",
"Philippe",
""
],
[
"Lewin",
"Mathieu",
""
],
[
"Sere",
"Eric",
""
]
] | [
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] |
712.2912 | Jonas Kahn | Jonas Kahn | Model selection for quantum homodyne tomography | 40 pages, 2 figures, submitted to ESAIM: Probability and Statistics | null | null | null | math.ST stat.TH | null | This paper deals with a non-parametric problem coming from physics, namely
quantum tomography. That consists in determining the quantum state of a mode of
light through a homodyne measurement. We apply several model selection
procedures: penalized projection estimators, where we may use pattern functions
or wavelets, and penalized maximum likelihood estimators. In all these cases,
we get oracle inequalities. In the former we also have a polynomial rate of
convergence for the non-parametric problem. We finish the paper with
applications of similar ideas to the calibration of a photocounter, a
measurement apparatus counting the number of photons in a beam. Here the
mathematical problem reduces similarly to a non-parametric missing data
problem. We again get oracle inequalities, and better speed if the photocounter
is good.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:56:03 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Kahn",
"Jonas",
""
]
] | [
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] |
712.2913 | Michael Entov | Michael Entov, Leonid Polterovich | C^0-rigidity of Poisson brackets | Latex, 11 pages | null | null | null | math.SG math.CA | null | Consider a functional associating to a pair of compactly supported smooth
functions on a symplectic manifold the maximum of their Poisson bracket. We
show that this functional is lower semi-continuous with respect to the product
uniform (C^0) norm on the space of pairs of such functions. This extends
previous results of Cardin-Viterbo and Zapolsky. The proof involves theory of
geodesics of the Hofer metric on the group of Hamiltonian diffeomorphisms. We
also discuss a failure of a similar semi-continuity phenomenon for multiple
Poisson brackets of three or more functions.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 09:59:21 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Entov",
"Michael",
""
],
[
"Polterovich",
"Leonid",
""
]
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] |
712.2914 | Stefan Schaefer | Thomas DeGrand and Stefan Schaefer | Topological susceptibility in two-flavor QCD | 9 pages,7 figures | null | null | COLO-HEP-532, HU-EP-07/63, SFB/CPP-07-8 | hep-lat | null | We compute the topological susceptibility in QCD with two flavors of
dynamical fermions using numerical simulation with overlap fermions.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:01:19 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"DeGrand",
"Thomas",
""
],
[
"Schaefer",
"Stefan",
""
]
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] |
712.2915 | Wilfried Schoepe | W. Schoepe | On the Transition to Turbulence of Oscillatory Flow of Liquid Helium-4 | null | null | 10.1007/s10909-007-9608-2 | null | cond-mat.other | null | Oscillating solid bodies have frequently been used for studying the
properties of normal and superfluid helium. In particular, the transition from
laminar flow to turbulence has attracted much interest recently. The purpose of
this note is to review several central features of this transition in
oscillatory flow, which have been inaccurately formulated in some recent work.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:16:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schoepe",
"W.",
""
]
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712.2916 | Makoto Natsuume | Makoto Natsuume and Takashi Okamura | Causal hydrodynamics of gauge theory plasmas from AdS/CFT duality | 20 pages, ReVTeX4; v3: the sound mode results for SAdS_{4,7} added,
an early interpretation based only on the shear mode changed; v6: corrected
solution in Appendix B | Phys.Rev.D77:066014,2008; Erratum-ibid.D78:089902,2008 | 10.1103/PhysRevD.77.066014 10.1103/PhysRevD.78.089902 | KEK-TH-1209 | hep-th hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study causal hydrodynamics (Israel-Stewart theory) of gauge theory plasmas
from the AdS/CFT duality. Causal hydrodynamics requires new transport
coefficients (relaxation times) and we compute them for a number of
supersymmetric gauge theories including the N=4 SYM. However, the relaxation
times obtained from the "shear mode" do not agree with the ones from the "sound
mode," which implies that the Israel-Stewart theory is not a sufficient
framework to describe the gauge theory plasmas.
| [
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712.2917 | Makoto Natsuume | Makoto Natsuume and Takashi Okamura | Comment on "Viscous hydrodynamics relaxation time from AdS/CFT
correspondence" | 2 pages, ReVTeX4 | null | null | KEK-TH-1210 | hep-th hep-ph nucl-th | null | This is a comment to hep-th/0703243. The paper determined the relaxation time
tau_pi of the shear viscous stress for the N=4 SYM from AdS/CFT correspondence.
The purpose of this comment is to point out that the value of tau_pi is 3 times
larger than their result if one takes into account an additional term in the
hydrodynamic equation.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:52:25 GMT"
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{
"version": "v2",
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712.2918 | Anastasia Doikou | Anastasia Doikou | Non-diagonal reflection for the non-critical XXZ model | 8 pages Latex | J.Phys.A41:194007,2008 | 10.1088/1751-8113/41/19/194007 | null | hep-th cond-mat.stat-mech math-ph math.MP nlin.SI | null | The most general physical boundary $S$-matrix for the open XXZ spin chain in
the non-critical regime ($\cosh (\eta)>1$) is derived starting from the bare
Bethe ansazt equations. The boundary $S$-matrix as expected is expressed in
terms of $\Gamma_q$-functions. In the isotropic limit corresponding results for
the open XXX chain are also reproduced.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:25:05 GMT"
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[
"Doikou",
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] |
712.2919 | Martin Castelnovo | Martin Castelnovo (Phys-ENS), Alex Evilevitch (L.U.) | DNA ejection from bacteriophage: towards a general behavior for osmotic
suppression experiments | null | The European Physical Journal E 24 (2007) 9-18 | 10.1140/epje/i2007-10205-5 | null | physics.bio-ph | null | We present in this work in vitro measurements of the force ejecting DNA from
two distinct bacteriophages (T5 and lambda) using the smotic-suppression
technique. Our data are analyzed by revisiting the current theories of DNA
packaging in spherical capsids. In particular we show that a simplified
analytical model based on bending considerations only is able to account
quantitatively for the experimental findings. Physical and biological
consequences are discussed.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:28:48 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Castelnovo",
"Martin",
"",
"Phys-ENS"
],
[
"Evilevitch",
"Alex",
"",
"L.U."
]
] | [
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] |
712.292 | Philip Greulich | Philip Greulich and Andreas Schadschneider | Single-Bottleneck Approximation for Driven Lattice Gases with Disorder
and Open Boundary Conditions | submitted to J. Stat. Mech | J. Stat. Mech. (2008) P04009 | 10.1088/1742-5468/2008/04/P04009 | null | cond-mat.stat-mech | null | We investigate the effects of disorder on driven lattice gases with open
boundaries using the totally asymmetric simple exclusion process as a
paradigmatic example. Disorder is realized by randomly distributed defect sites
with reduced hopping rate. In contrast to equilibrium, even macroscopic
quantities in disordered non-equilibrium systems depend sensitively on the
defect sample. We study the current as function of the entry and exit rates and
the realization of disorder and find that it is, in leading order, determined
by the longest stretch of consecutive defect sites (single-bottleneck
approximation, SBA). Using results from extreme value statistics the SBA allows
to study ensembles with fixed defect density which gives accurate results, e.g.
for the expectation value of the current. Corrections to SBA come from
effective interactions of bottlenecks close to the longest one. Defects close
to the boundaries can be described by effective boundary rates and lead to
shifts of the phase transitions. Finally it is shown that the SBA also works
for more complex models. As an example we discuss a model with internal states
that has been proposed to describe transport of the kinesin KIF1A.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:55:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Greulich",
"Philip",
""
],
[
"Schadschneider",
"Andreas",
""
]
] | [
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712.2921 | Nicolas Bessolaz Mr | N. Bessolaz (1), C. Zanni (1), J. Ferreira (1), R. Keppens (2 and 3
and 4), J. Bouvier (1) ((1) Laboratoire d'Astrophysique de Grenoble,
Universite Joseph-Fourier, France, (2) Centre for Plasma Astrophysics,
K.U.Leuven, Belgium, (3) FOM Institute for Plasma Physics, Rijnhuizen, the
Netherlands, (4) Astronomical Institute, Utrecht University) | Accretion funnels onto weakly magnetized young stars | 8 pages, 6 figures, accepted in A&A | null | 10.1051/0004-6361:20078328 | null | astro-ph | null | Aims : We re-examine the conditions required to steadily deviate an accretion
flow from a circumstellar disc into a magnetospheric funnel flow onto a slow
rotating young forming star. Methods : New analytical constraints on the
formation of accretion funnels flows due to the presence of a dipolar stellar
magnetic field disrupting the disc are derived. The Versatile Advection Code is
used to confirm these constraints numerically. Axisymmetric MHD simulations are
performed, where a stellar dipole field enters the resistive accretion disc,
whose structure is self-consistently computed. Results : The analytical
criterion derived allows to predict a priori the position of the truncation
radius from a non perturbative accretion disc model. Accretion funnels are
found to be robust features which occur below the co-rotation radius, where the
stellar poloidal magnetic pressure becomes both at equipartition with the disc
thermal pressure and is comparable to the disc poloidal ram pressure. We
confirm the results of Romanova et al. 2002 and find accretion funnels for
stellar dipole fields as low as 140 G in the low accretion rate limit of
$10^{-9} M_\odot.yr^{-1}$. With our present numerical setup with no disc
magnetic field, we found no evidence of winds, neither disc driven nor X-winds,
and the star is only spun up by its interaction with the disc. Conclusions :
Weak dipole fields, similar in magnitude to those observed, lead to the
development of accretion funnel flows in weakly accreting T Tauri stars.
However, the higher accretion observed for most T Tauri stars (${\dot M} \sim
10^{-8} M_\odot.yr^{-1}$) requires either larger stellar field strength and/or
different magnetic topologies to allow for magnetospheric accretion.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:33:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bessolaz",
"N.",
"",
"2 and 3\n and 4"
],
[
"Zanni",
"C.",
"",
"2 and 3\n and 4"
],
[
"Ferreira",
"J.",
"",
"2 and 3\n and 4"
],
[
"Keppens",
"R.",
"",
"2 and 3\n and 4"
],
[
"Bouvier",
"J.",
""
]
] | [
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712.2922 | Mahir S. Hussein | M. S. Hussein | Absorption-Fluctuation Theorem for Nuclear Reactions: Brink-Axel,
Incomplete Fusion and All That | 9 pages. Contribution to the International Workshop on
Compound-Nuclear Reactions and Related Topics (CNR*2007), October 22-26,
2007, Fish Camp, California. To be published in AIP Proceedings (Editor Jutta
Escher) | AIPConf.Proc.1005:129-134,2008 | 10.1063/1.2920715 | null | nucl-th | null | We discuss the connection between absorption, averages and fluctuations in
nuclear reactions. The fluctuations in the entrance channel result in the
compound nucleus, Hauser-Feshbach, cross section, the fluctuations in the
intermediate channels, result in modifications of multistep reaction cross
sections, while the fluctuations in the final channel result in hybrid cross
sections that can be used to describe incomplete fusion reactions. We discuss
the latter in details and comment on the validity of the assumptions used in
the develpoment of the Surrogate method. We also discuss the theory of
multistep reactions with regards to intermediate state fluctuations and the
energy dependence and non-locality of the intermediate channels optical
potentials.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:34:03 GMT"
},
{
"version": "v2",
"created": "Sun, 13 Jan 2008 19:15:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hussein",
"M. S.",
""
]
] | [
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] |
712.2923 | Roumen Anguelov | Roumen Anguelov, Inger Plaskitt | A Class of LULU Operators on Multi-Dimensional Arrays | null | null | null | null | cs.CV | null | The LULU operators for sequences are extended to multi-dimensional arrays via
the morphological concept of connection in a way which preserves their
essential properties, e.g. they are separators and form a four element fully
ordered semi-group. The power of the operators is demonstrated by deriving a
total variation preserving discrete pulse decomposition of images.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:43:23 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Anguelov",
"Roumen",
""
],
[
"Plaskitt",
"Inger",
""
]
] | [
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] |
712.2924 | Yousef Ghazi-Tabatabai | Fay Dowker and Yousef Ghazi-Tabatabai | Dynamical Wave Function Collapse Models in Quantum Measure Theory | 20 pages, 1 figure. Revised after refereeing | J.Phys.A41:205306,2008 | 10.1088/1751-8113/41/20/205306 | null | quant-ph | null | The structure of Collapse Models is investigated in the framework of Quantum
Measure Theory, a histories-based approach to quantum mechanics. The underlying
structure of coupled classical and quantum systems is elucidated in this
approach which puts both systems on a spacetime footing. The nature of the
coupling is exposed: the classical histories have no dynamics of their own but
are simply tied, more or less closely, to the quantum histories.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:48:15 GMT"
},
{
"version": "v2",
"created": "Thu, 15 May 2008 10:18:22 GMT"
}
] | 2012-10-19T00:00:00 | [
[
"Dowker",
"Fay",
""
],
[
"Ghazi-Tabatabai",
"Yousef",
""
]
] | [
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] |
712.2925 | Raymond Nepstad | R. Nepstad, L. S{\ae}len and J. P. Hansen | Coherent adiabatic theory of two-electron quantum dot molecules in
external spin baths | 4 pages, 3 figures | null | 10.1103/PhysRevB.77.125315 | null | cond-mat.other | null | We derive an accurate molecular orbital based expression for the coherent
time evolution of a two-electron wave function in a quantum dot molecule where
the electrons interact with each other, with external time dependent
electromagnetic fields and with a surrounding nuclear spin reservoir. The
theory allows for direct numerical modeling of the decoherence in quantum dots
due to hyperfine interactions. Calculations result in good agreement with
recent singlet-triplet dephasing experiments by Laird et. al. [Phys. Rev. Lett.
97, 056801 (2006)], as well as analytical model calculations. Furthermore, it
is shown that using a much faster electric switch than applied in these
experiments will transfer the initial state to excited states where the
hyperfine singlet-triplet mixing is negligible.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 10:53:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nepstad",
"R.",
""
],
[
"Sælen",
"L.",
""
],
[
"Hansen",
"J. P.",
""
]
] | [
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] |
712.2926 | Chihiro Sasaki | K. Redlich (Univ. of Wroclaw and GSI), B. Friman (GSI), C. Sasaki (TU
Munich) | Density fluctuations and chiral phase transition | 8 pages, 4 figures, contribution to SQM 2007 in Levoca, Slovakia, J.
Phys. G in press | J.Phys.G35:044013,2008 | 10.1088/0954-3899/35/4/044013 | null | hep-ph nucl-th | null | Based on an effective QCD Lagrangian we discuss the properties of charge
density fluctuations in the vicinity of chiral phase transition. We explore
thermodynamics in the presence of spinodal phase separation. We show that
appearance of spinodal decomposition in a non-equilibrium first order phase
transition results in divergence of the charge density fluctuations related
with the electric charge and baryon number conservation. Consequently,
divergent fluctuations at the chiral phase transition are not only attributed
to the critical end point but are also there along the first order phase
transition if the spinodal phase separation take place. Based on the mean field
dynamics, the critical exponents for these singular behavior of charge
susceptibilities are also discussed.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:07:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Redlich",
"K.",
"",
"Univ. of Wroclaw and GSI"
],
[
"Friman",
"B.",
"",
"GSI"
],
[
"Sasaki",
"C.",
"",
"TU\n Munich"
]
] | [
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712.2927 | Abhas Mitra | Abhas Mitra | Masses of radiation pressure supported stars in extreme relativistic
realm | Proceedings of IAU Symposium #238, held 21-25 August, 2006 in Prague,
Czech Republic | Black Holes from Stars to Galaxies-- Across the Range of Masses,
Ed. V. Karas & G. Matt. Cam. Univ. Press, (2007), pp.409 | 10.1017/S1743921307005698 | null | physics.gen-ph | null | We discuss that in the extreme relativistic limit, i.e., when z >>1, where z
is the surface gravitational redshift, there could be radiation pressure
supported and dominated stars with arbitrary gravitational mass, high or low.
Such Objects are called Eternally Collapsing Objects (ECOs). ECOs are
practically as compact as Schwarzschil Black Holes (BH) and, observationally,
are likely to be mistaken as BHs. Further since any object undergoing continued
collapse must first become an ECO before becoming a true BH state charcterized
by M=0, the observed BH Candidates are ECOs.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:13:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mitra",
"Abhas",
""
]
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712.2928 | Danil Boukhvalov W | D.W. Boukhvalov and M. I. Katsnelson | Defect-induced ferromagnetism in fullerenes | 11 pages, 7 figures, final version to be published in Eur. Phys. J B | The European Physical Journal B 68(4), 529-535 (2009) | 10.1140/epjb/e2009-00119-2 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the ab initio electronic structure calculations the picture of
ferromagnetism in polimerized C60 is proposed which seems to explain the whole
set of controversial experimental data. We have demonstrated that, in contrast
with cubic fullerene, in rhombohedral C60 the segregation of iron atoms is
energetically unprofitable which is a strong argument in favor of intrinsic
character of carbon ferromagnetism which can be caused by vacancies with
unpaired magnetic electrons. It is shown that: (i) energy formation of the
vacancies in the rhombohedral phase of C60 is essentially smaller than in the
cubic phase, (ii) there is a strong ferromagnetic exchange interactions between
carbon cages containing the vacancies, and (iii) the fusion of the magnetic
vacancies into nonmagnetic bivacancy is energetically profitable. The latter
can explain a fragility of the ferromagnetism.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:17:46 GMT"
},
{
"version": "v2",
"created": "Sun, 5 Apr 2009 20:03:49 GMT"
}
] | 2009-05-11T00:00:00 | [
[
"Boukhvalov",
"D. W.",
""
],
[
"Katsnelson",
"M. I.",
""
]
] | [
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712.2929 | Marcus Warfheimer | Marcus Warfheimer | Attractive nearest-neighbor spin systems on the integers in a randomly
evolving environment | 14 pages | null | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider spin systems on $\Z$ (i.e.\ interacting particle systems on $\Z$
in which each coordinate only has two possible values and only one coordinate
changes in each transition) whose rates are determined by another process,
called a background process. A canonical example is the so called contact
process in randomly evolving environment (CPREE), introduced and analysed by E.
Broman and furthermore studied by J. Steif and the author, where the marginals
of the background process independently evolve as 2-state Markov chains and
determine the recovery rates for a contact process. We prove that under certain
conditions on the rates there are at most two extremal stationary
distributions. The proof follows closely the ideas of Liggett's proof of a
corresponding theorem for spin systems on $\Z$ without a background process.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:38:12 GMT"
},
{
"version": "v2",
"created": "Sat, 17 Apr 2010 08:09:00 GMT"
}
] | 2010-04-20T00:00:00 | [
[
"Warfheimer",
"Marcus",
""
]
] | [
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] |
712.293 | Sandor D. Katz | Z. Fodor | Recent Result in QCD Thermodynamics from the Lattice | 15 pages, Critical Point and Onset of Deconfinement 4th International
Workshop, July 9-13 2007, GSI Darmstadt,Germany | PoSCPOD07:027,2007 | null | null | hep-lat | null | Recent results on QCD thermodynamics are presented. The nature of the T>0
transition is determined, which turns out to be an analytic cross-over. The
absolute scale for this transition is calculated. The results were obtained by
using a Symanzik improved gauge and stout-link improved fermionic action. In
order to approach the continuum limit four different sets of lattice spacings
were used with temporal extensions N_t=4, 6, 8 and 10 (they correspond to
lattice spacings a \sim 0.3, 0.2, 0.15 and 0.12 fm). The equation of state is
determined on N_t=4 and 6 lattices. The importance of the continuum limit for
different results (critical endpoint, colour superconducting phase) at
non-vanishing baryonic densities is discussed.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:27:21 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Fodor",
"Z.",
""
]
] | [
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] |
712.2931 | William Chaplin | W. J. Chaplin, Y. Elsworth, R. New, T. Toutain | Distortion of the p-mode peak profiles by the solar-cycle frequency
shifts: do we need to worry? | 7 pages; accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12833.x | null | astro-ph | null | We seek to address whether solar-cycle frequency shifts of the Sun's low-l p
modes `distort' the underlying shapes of the mode peaks, when those peaks are
observed in power frequency spectra made from data spanning large fractions, or
more, of the cycle period. We present analytical descriptions of the expected
profiles, and validate the predictions through use of artificial seismic
timeseries data, in which temporal variations of the oscillator frequencies are
introduced. Our main finding is that for the Sun-like frequency shifts the
distortion of the asymmetrical Lorentzian-like profiles is very small, but also
just detectible. Our analysis indicates that by fitting modes to the usual
Lorentzian-like models -- which do not allow for the distortion -- rather than
new models we derive, there is a bias in the mode height and linewidth
parameters that is comparable in size to the observational uncertainties given
by multi-year datasets. Bias in the frequency parameter gives much less cause
for worry, being over an order of magnitude smaller than the corresponding
frequency uncertainties. The distortion discussed in this paper may need to be
considered when multi-year Sun-like asteroseismic datasets are analyzed on
stars showing strong activity cycles.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:33:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chaplin",
"W. J.",
""
],
[
"Elsworth",
"Y.",
""
],
[
"New",
"R.",
""
],
[
"Toutain",
"T.",
""
]
] | [
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] |
712.2932 | Leo van Iersel | Leo van Iersel, Steven Kelk and Matthias Mnich | Uniqueness, intractability and exact algorithms: reflections on level-k
phylogenetic networks | null | null | null | null | q-bio.PE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phylogenetic networks provide a way to describe and visualize evolutionary
histories that have undergone so-called reticulate evolutionary events such as
recombination, hybridization or horizontal gene transfer. The level k of a
network determines how non-treelike the evolution can be, with level-0 networks
being trees. We study the problem of constructing level-k phylogenetic networks
from triplets, i.e. phylogenetic trees for three leaves (taxa). We give, for
each k, a level-k network that is uniquely defined by its triplets. We
demonstrate the applicability of this result by using it to prove that (1) for
all k of at least one it is NP-hard to construct a level-k network consistent
with all input triplets, and (2) for all k it is NP-hard to construct a level-k
network consistent with a maximum number of input triplets, even when the input
is dense. As a response to this intractability we give an exact algorithm for
constructing level-1 networks consistent with a maximum number of input
triplets.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:59:51 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Jan 2008 09:24:17 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Jul 2008 10:53:23 GMT"
}
] | 2008-07-21T00:00:00 | [
[
"van Iersel",
"Leo",
""
],
[
"Kelk",
"Steven",
""
],
[
"Mnich",
"Matthias",
""
]
] | [
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] |
712.2933 | Peihong Gu | Pei-Hong Gu, Utpal Sarkar | Radiative Neutrino Mass, Dark Matter and Leptogenesis | 4 pages, 3 figures. Revised version with improved model. Accepted by
PRD | Phys.Rev.D77:105031,2008 | 10.1103/PhysRevD.77.105031 | null | hep-ph | null | We propose an extension of the standard model, in which neutrinos are Dirac
particles and their tiny masses originate from a one-loop radiative diagram.
The new fields required by the neutrino mass-generation also accommodate the
explanation for the matter-antimatter asymmetry and dark matter in the
universe.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:35:17 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Apr 2008 13:20:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gu",
"Pei-Hong",
""
],
[
"Sarkar",
"Utpal",
""
]
] | [
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] |
712.2934 | Julio Largo | J. Largo, M.A. Miller, F. Sciortino | The vanishing limit of the square-well fluid: the adhesive hard sphere
model as a reference system | 14 pages, 4 figures, 2 tables | null | 10.1063/1.2883696 | null | cond-mat.soft cond-mat.stat-mech | null | We report a simulation study of the gas-liquid critical point for the
square-well potential, for values of well width delta as small as 0.005 times
the particle diameter sigma. For small delta, the reduced second virial
coefficient at the critical point B_2*c is found to depend linearly on delta.
The observed weak linear dependence is not sufficient to produce any
significant observable effect if the critical temperature T_c is estimated via
a constant B_2*c assumption, due to the highly non linear transformation
between B_2*c and T_c. This explains the previously observed validity of the
law of corresponding states. The critical density rho_c is also found to be
constant when measured in units of the cubed average distance between two
bonded particles (1+0.5 delta)/sigma. The possibility of describing the delta
-> 0 dependence with precise functional forms provides improved acccurate
estimates of the critical parameters of the adhesive hard-sphere AHS model.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:36:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Largo",
"J.",
""
],
[
"Miller",
"M. A.",
""
],
[
"Sciortino",
"F.",
""
]
] | [
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] |
712.2935 | Matthew Grace | Matthew D. Grace, Constantin Brif, Herschel Rabitz, Daniel A. Lidar,
Ian A. Walmsley, and Robert L. Kosut | Fidelity of optimally controlled quantum gates with randomly coupled
multiparticle environments | tMOP LaTeX, 9 pages, 3 figures; Special issue of the Journal of
Modern Optics: 37th Winter Colloquium on the Physics of Quantum Electronics,
2-6 January 2007 | J. Mod. Optics, 54 (16-17), 2339 (2007) | 10.1080/09500340701639615 | null | quant-ph | null | This work studies the feasibility of optimal control of high-fidelity quantum
gates in a model of interacting two-level particles. One particle (the qubit)
serves as the quantum information processor, whose evolution is controlled by a
time-dependent external field. The other particles are not directly controlled
and serve as an effective environment, coupling to which is the source of
decoherence. The control objective is to generate target one-qubit gates in the
presence of strong environmentally-induced decoherence and under physically
motivated restrictions on the control field. It is found that interactions
among the environmental particles have a negligible effect on the gate fidelity
and require no additional adjustment of the control field. Another interesting
result is that optimally controlled quantum gates are remarkably robust to
random variations in qubit-environment and inter-environment coupling
strengths. These findings demonstrate the utility of optimal control for
management of quantum-information systems in a very precise and specific
manner, especially when the dynamics complexity is exacerbated by inherently
uncertain environmental coupling.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 19:48:33 GMT"
}
] | 2009-12-23T00:00:00 | [
[
"Grace",
"Matthew D.",
""
],
[
"Brif",
"Constantin",
""
],
[
"Rabitz",
"Herschel",
""
],
[
"Lidar",
"Daniel A.",
""
],
[
"Walmsley",
"Ian A.",
""
],
[
"Kosut",
"Robert L.",
""
]
] | [
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] |
712.2936 | Alfredo Poves | F. Nowacki and A. Poves | A new effective interaction for $0\hbar\omega$ shell model calculations
in the sdpf valence space | 6 pages 4 figures, accepted in Phys. Rev. C | Phys.Rev.C79:014310,2009 | 10.1103/PhysRevC.79.014310 | null | nucl-th nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutron rich isotopes with Z<20, in particular those with neutron numbers
around N=28,have been at the focus of a lot experimental and theoretical
scrutiny during the last few years.Shell model calculations using the effective
interaction SDPF-NR, were able to predictor to explain most of the properties
featured by these nuclei. Prominent among them is the disappearance of the N=28
shell closure for Z<=16. We have incorporated to SDPF-NR some modifications,
either on purely theoretical grounds or guided by new experimental information.
The proposed interaction, SDPF-U, contains USD as its sd-shell part and KB3G as
its pf-shell-part. Its range of applicability is enlarged and its reliability
enhanced with respect to the earlier version.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:38:50 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Sep 2008 14:40:24 GMT"
},
{
"version": "v3",
"created": "Tue, 13 Jan 2009 16:19:35 GMT"
}
] | 2009-02-18T00:00:00 | [
[
"Nowacki",
"F.",
""
],
[
"Poves",
"A.",
""
]
] | [
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] |
712.2937 | Luis Ramon Bellot Rubio | L.R. Bellot Rubio, A. Tritschler, V. Martinez Pillet | Spectropolarimetry of a decaying sunspot penumbra | Accepted for publication in ApJ | null | 10.1086/527366 | null | astro-ph | null | We report on high angular resolution, high precision spectropolarimetric
measurements of a decaying sunspot. The spot gradually lost its penumbra during
the course of three days. In the late stages of evolution where the only
remnant of the spot is a naked umbra, we find small-scale inhomogeneities in
the magnetic canopy surrounding it. The inhomogeneities are observed as
finger-like structures of weak and nearly horizontal magnetic fields extending
1-2 arcsec from the outer border of the umbra. These fields are not associated
with filamentary structures in continuum intensity, nor with conspicuous
Evershed flows. The Stokes profiles emerging from the fingers exhibit
blueshifts which we interpret as upward motions. This previously unknown fine
structure may be related to penumbral field lines that no longer carry strong
Evershed flows and rise to the chromosphere, producing the disappearance of the
penumbra at photospheric levels.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:56:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rubio",
"L. R. Bellot",
""
],
[
"Tritschler",
"A.",
""
],
[
"Pillet",
"V. Martinez",
""
]
] | [
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-0.0380494185,
-0.077433005,
0.043719627,
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-0.0231298376,
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0.0044194283,
0.0083193015,
0.1189461276
] |
712.2938 | Naoki Yamatsu | Kenzo Inoue, Naoki Yamatsu (Kyushu U.) | Charged lepton and down-type quark masses in SU(1,1) model and the
structure of higgs sector | 25 pages, no figures | Prog.Theor.Phys.119:775-796, 2008 | 10.1143/PTP.119.775 | KYUSHU-HET-109 | hep-ph | null | The simplest noncompact group SU(1,1),when introduced as a symmetry group of
the generations of quarks and leptons in the framework of a vector-like theory,
gives an excellent viewpoint on low energy physics. The minimal setup of the
scheme, however, gives phenomenologically unacceptable prediction on the Yukawa
coupling matrices. This suggests the higgs sector has richer structure than we
expect from the success of MSSM. The natural extension of the scheme, which has
doubled structure in the higgs sector, is formulated. The framework admits this
extension in a restrictive way. The possible patterns of Yukawa couplings are
classified and the expressions of the coupling matrices are presented.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 11:58:45 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 08:53:43 GMT"
}
] | 2009-12-15T00:00:00 | [
[
"Inoue",
"Kenzo",
"",
"Kyushu U."
],
[
"Yamatsu",
"Naoki",
"",
"Kyushu U."
]
] | [
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] |
712.2939 | Chien-Lung Huang | C. L. Huang, J.-Y. Lin, Y. T. Chang, C. P. Sun, H. Y. Shen, C. C.
Chou, H. Berger, T. K. Lee, and H. D. Yang | Experimental evidence for a two-gap structure of superconducting NbSe_2:
a specific heat study in external magnetic fields | 16 pages, 4 figures | Physical Review B 76, 212504 (2007) | 10.1103/PhysRevB.76.212504 | null | cond-mat.supr-con | null | To resolve the discrepancies of the superconducting order parameter in
quasi-two-dimensional NbSe_2, comprehensive specific-heat measurements have
been carried out. By analyzing both the zero-field and mixed-state data with
magnetic fields perpendicular to and parallel to the c axis of the crystal and
using the two-gap model, we conclude that (1) more than one energy scale of the
order parameter is required for superconducting NbSe_2 due to the thermodynamic
consistency; (2)delta_L=1.26 meV and delta_S=0.73 meV are obtained; (3)
N_S(0)/N(0)=11%~20%; (4) The observation of the kink in gamma(H) curve suggests
that the two-gap scenario is more favorable than the anisotropic s-wave model
to describe the gap structure of NbSe_2; and (5)delta_S is more isotropic and
has a three-dimensional-like feature and is located either on the Se or the
bonding Nb Fermi sheets.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:18:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Huang",
"C. L.",
""
],
[
"Lin",
"J. -Y.",
""
],
[
"Chang",
"Y. T.",
""
],
[
"Sun",
"C. P.",
""
],
[
"Shen",
"H. Y.",
""
],
[
"Chou",
"C. C.",
""
],
[
"Berger",
"H.",
""
],
[
"Lee",
"T. K.",
""
],
[
"Yang",
"H. D.",
""
]
] | [
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712.294 | Ivan Nourdin | Ivan Nourdin (PMA), Giovanni Peccati (LSTA) | Stein's method on Wiener chaos | 39 pages; Two sections added; To appear in PTRF | null | null | null | math.PR | null | We combine Malliavin calculus with Stein's method, in order to derive
explicit bounds in the Gaussian and Gamma approximations of random variables in
a fixed Wiener chaos of a general Gaussian process. We also prove results
concerning random variables admitting a possibly infinite Wiener chaotic
decomposition. Our approach generalizes, refines and unifies the central and
non-central limit theorems for multiple Wiener-It\^o integrals recently proved
(in several papers, from 2005 to 2007) by Nourdin, Nualart, Ortiz-Latorre,
Peccati and Tudor. We apply our techniques to prove Berry-Ess\'een bounds in
the Breuer-Major CLT for subordinated functionals of fractional Brownian
motion. By using the well-known Mehler's formula for Ornstein-Uhlenbeck
semigroups, we also recover a technical result recently proved by Chatterjee,
concerning the Gaussian approximation of functionals of finite-dimensional
Gaussian vectors.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:20:35 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Dec 2007 15:32:39 GMT"
},
{
"version": "v3",
"created": "Fri, 25 Jan 2008 10:49:24 GMT"
},
{
"version": "v4",
"created": "Sun, 3 Feb 2008 18:50:33 GMT"
},
{
"version": "v5",
"created": "Sat, 10 May 2008 12:28:46 GMT"
}
] | 2008-05-10T00:00:00 | [
[
"Nourdin",
"Ivan",
"",
"PMA"
],
[
"Peccati",
"Giovanni",
"",
"LSTA"
]
] | [
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] |
712.2941 | Ivan Zivic | Ivan Zivic, Suncica Elezovic-Hadzic and Sava Milosevic | Critical behavior of interacting two-polymer system in a fractal
solvent: an exact renormalization group approach | 21 pages, 6 figures | Journal of Statistical Mechanics: Theory and Experiment (2008)
P04022 | 10.1088/1742-5468/2008/04/P04022 | null | cond-mat.stat-mech | null | We study the polymer system consisting of two polymer chains situated in a
fractal container that belongs to the three--dimensional Sierpinski Gasket (3D
SG) family of fractals. Each 3D SG fractal has four fractal impenetrable 2D
surfaces, which are, in fact, 2D SG fractals. The two-polymer system is
modelled by two interacting self-avoiding walks (SAWs), one of them
representing a 3D floating polymer, while the other corresponds to a chain
adhered to one of the four 2D SG boundaries. We assume that the studied system
is immersed in a poor solvent inducing the intra-chain interactions. For the
inter-chain interactions we propose two models: in the first model (ASAWs) the
SAW chains are mutually avoiding, whereas in the second model (CSAWs) chains
can cross each other. By applying an exact Renormalization Group (RG) method,
we establish the relevant phase diagrams for $b=2,3$ and $b=4$ members of the
3D SG fractal family for the model with avoiding SAWs, and for $b=2$ and $b=3$
fractals for the model with crossing SAWs. Also, at the appropriate transition
fixed points we calculate the contact critical exponents, associated with the
number of contacts between monomers of different chains. Throughout the paper
we compare results obtained for the two models and discuss the impact of the
topology of the underlying lattices on emerging phase diagrams.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:20:51 GMT"
}
] | 2008-04-18T00:00:00 | [
[
"Zivic",
"Ivan",
""
],
[
"Elezovic-Hadzic",
"Suncica",
""
],
[
"Milosevic",
"Sava",
""
]
] | [
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] |
712.2942 | Taekyun Kim | Min-Soo Kim, Taekyun Kim, Jin-Woo Son | On A two-variable p-adic l_q function | 11S80 | null | 10.1155/2008/360517 | null | math.NT | null | We prove that a two-variable p-adic l_q-function has the series p-adic
expansion which interpolates a linear combinations of terms of the generalized
q-Euler polynomials at non positive integers. The proof of this original
construction is due to Kubota and Leopoldt in 1964, although the method given
this note is due to Washington
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:20:52 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kim",
"Min-Soo",
""
],
[
"Kim",
"Taekyun",
""
],
[
"Son",
"Jin-Woo",
""
]
] | [
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712.2943 | Bob Diertens | Bob Diertens | Software (Re-)Engineering with PSF | null | null | null | PRG0505 | cs.SE | null | This paper investigates the usefulness of PSF in software engineering and
reengineering. PSF is based on ACP (Algebra of Communicating Processes) and as
some architectural description languages are based on process algebra, we
investigate whether PSF can be used at the software architecture level, but we
also use PSF at lower abstract levels. As a case study we reengineer the
compiler from the Toolkit of PSF.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:25:02 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Diertens",
"Bob",
""
]
] | [
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] |
712.2944 | Mariluz Mart\'in Manj\'on | M. Mart\'in Manj\'on, M. Moll\'a, A. I. D\'iaz, R. Terlevich | The evolution of H{\sc ii} galaxies: Testing the bursting scenario
through the use of self-consistent models | 13 figures and 2 tables, accepted for publication in MNRAS Main
Journal | null | 10.1111/j.1365-2966.2008.12875.x | null | astro-ph | null | We have computed a series of realistic and self-consistent models of the
emitted spectra of H{\sc ii} galaxies. Our models combine different codes of
chemical evolution, evolutionary population synthesis and photoionization. The
emitted spectrum of H{\sc ii} galaxies is reproduced by means of the
photoionization code CLOUDY, using as ionizing spectrum the spectral energy
distribution of the modelled H{\sc ii} galaxy, which in turn is calculated
according to a Star Formation History (SFH) and a metallicity evolution given
by a chemical evolution model that follows the abundances of 15 different
elements. The contribution of emission lines to the broad-band colours is
explicitly taken into account.
The results of our code are compared with photometric and spectroscopic data
of H{\sc ii} galaxies. Our technique reproduces observed diagnostic diagrams,
abundances, equivalent width-colour and equivalent width-metallicity relations
for local H{\sc ii} galaxies.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:32:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Manjón",
"M. Martín",
""
],
[
"Mollá",
"M.",
""
],
[
"Díaz",
"A. I.",
""
],
[
"Terlevich",
"R.",
""
]
] | [
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] |
712.2945 | Shi-Jie Yang | Shi-Jie Yang, Quan-Sheng Wu, Sheng-Nan Zhang, and Shiping Feng | Giant vortex and Skyrmion in a rotating two-species Bose-Einstein
condensate | 5 pages, 5 figures | Phys. Rev. A 77, 033621(2008) | 10.1103/PhysRevA.77.033621 | null | cond-mat.other | null | Numerical simulations are performed for a rotating two-species Bose
condensate confined by a harmonic potential. The particle numbers of each
species are unequal. When the rotational speed exceeds a critical value, the
majority species reside in the center of the potential while the minority
species is pushed out to the outskirts, forming a giant vortex hole to contain
the majority species. A novel annular Skyrmion forms at the interface of the
two species.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:33:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"Shi-Jie",
""
],
[
"Wu",
"Quan-Sheng",
""
],
[
"Zhang",
"Sheng-Nan",
""
],
[
"Feng",
"Shiping",
""
]
] | [
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] |
712.2946 | Thierry Coulbois | Thierry Coulbois (LATP), Arnaud Hilion (LATP), Martin Lustig (LATP) | $\R$-trees, dual laminations, and compact systems of partial isometries | minor update | Math. Proc. of the Cambridge Phil. Soc. 147, 2 (2009) 345-368 | 10.1017/S0305004109002436 | null | math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $\FN$ be a free group of finite rank $N \geq 2$, and let $T$ be an
$\R$-tree with a very small, minimal action of $\FN$ with dense orbits. For any
basis $\CA$ of $\FN$ there exists a {\em heart} $K_{\CA} \subset \bar T$ (= the
metric completion of $T$) which is a compact subtree that has the property that
the dynamical system of partial isometries $a_{i} : K_{\CA} \cap a_{i} K_{\CA}
\to a_{i}\inv K_{\CA} \cap K_{\CA}$, for each $a_{i} \in \CA$, defines a tree
$T_{(K_{\CA}, \CA)}$ which contains an isometric copy of $T$ as minimal
subtree.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:37:42 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Oct 2008 08:22:47 GMT"
},
{
"version": "v3",
"created": "Wed, 1 Apr 2009 16:33:59 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Coulbois",
"Thierry",
"",
"LATP"
],
[
"Hilion",
"Arnaud",
"",
"LATP"
],
[
"Lustig",
"Martin",
"",
"LATP"
]
] | [
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] |
712.2947 | Wolfgang Lucha | Z.-F. Li, Wolfgang Lucha, F. Schoberl | Stability in the instantaneous Bethe-Salpeter formalism: reduced
exact-propagator bound-state equation with harmonic interaction | 13 pages | J.Phys.G35:115002,2008 | 10.1088/0954-3899/35/11/115002 | HEPHY-PUB 855/07 | hep-ph nucl-th | null | Several numerical investigations of the Salpeter equation with static
confining interactions of Lorentz-scalar type revealed that its solutions are
plagued by instabilities of presumably Klein-paradox nature. By proving
rigorously that the energies of all predicted bound states are part of real,
entirely discrete spectra bounded from below, these instabilities are shown,
for confining interactions of harmonic-oscillator shape, to be absent for a
reduced version of an instantaneous Bethe-Salpeter formalism designed to
generalize the Salpeter equation towards an approximate inclusion of the exact
propagators of all bound-state constituents.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:55:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Li",
"Z. -F.",
""
],
[
"Lucha",
"Wolfgang",
""
],
[
"Schoberl",
"F.",
""
]
] | [
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] |
712.2948 | Stefan Nemirovski | Stefan Nemirovski | Finite unions of balls in C^n are rationally convex | V.2 - minor edits, 2 pages | Russian Math. Surveys 63:2 (2008), 381-382. | 10.1070/RM2008v063n02ABEH004518 | null | math.CV | null | It is shown that the rational convexity of any finite union of disjoint
closed balls in C^n follows easily from the results of Duval and Sibony.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 12:55:01 GMT"
},
{
"version": "v2",
"created": "Sun, 30 Dec 2007 11:24:58 GMT"
}
] | 2008-08-18T00:00:00 | [
[
"Nemirovski",
"Stefan",
""
]
] | [
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] |
712.2949 | Jonay I. Gonzalez Hernandez | J. I. Gonz\'alez Hern\'andez, P. Bonifacio, H.-G. Ludwig, E. Caffau,
M. Spite, F. Spite, R. Cayrel, P. Molaro, V. Hill, P. Fran\c{c}ois, B. Plez,
T. C. Beers, T. Sivarani, J. Andersen, B. Barbuy, E. Depagne, B. Nordstr\"om
and F. Primas | First Stars XI. Chemical composition of the extremely metal-poor dwarfs
in the binary CS 22876--032 | Accepted for publication in Astronomy & Astrophysics | null | 10.1051/0004-6361:20078847 | null | astro-ph | null | We have used high-resolution, high-S/N ratio spectra from the UVES
spectrograph at the ESO VLT telescope. Long-term radial-velocity measurements
and broad-band photometry allow us to determine improved orbital elements and
stellar parameters for both components. We use OSMARCS 1D models and the
{{\scshape turbospectrum}} spectral synthesis code to determine the abundances
of Li, O, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Fe, Co and Ni. We also use the
CO$^5$BOLD model atmosphere code to compute the 3D abundance corrections,
especially for Li and O. We find a metallicity of [Fe/H]$\sim -3.6$ for both
stars, using 1D models with 3D corrections of $\sim -0.1$ dex from averaged 3D
models. We determine the oxygen abundance from the near-UV OH bands; the 3D
corrections are large, -1 and -1.5 dex for the secondary and primary
respectively, and yield [O/Fe] $\sim 0.8$, close to the high-quality results
obtained from the [OI] 630 nm line in metal-poor giants. Other [$\alpha$/Fe]
ratios are consistent with those measured in other dwarfs and giants with
similar [Fe/H], although Ca and Si are somewhat low ([X/Fe]$\la 0$). Other
element ratios follow those of other halo stars. The Li abundance of the
primary star is consistent with the Spite plateau, but the secondary shows a
lower abundance; 3D corrections are small. The Li abundance in the primary star
supports the extension of the {{\em Spite Plateau}} value at the lowest
metallicities, without any decrease. The low abundance in the secondary star
could be explained by endogenic Li depletion, due to its cooler temperature. If
this is not the case, another, yet unknown mechanism may be causing increased
scatter in A(Li) at the lowest metallicities.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:05:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hernández",
"J. I. González",
""
],
[
"Bonifacio",
"P.",
""
],
[
"Ludwig",
"H. -G.",
""
],
[
"Caffau",
"E.",
""
],
[
"Spite",
"M.",
""
],
[
"Spite",
"F.",
""
],
[
"Cayrel",
"R.",
""
],
[
"Molaro",
"P.",
""
],
[
"Hill",
"V.",
""
],
[
"François",
"P.",
""
],
[
"Plez",
"B.",
""
],
[
"Beers",
"T. C.",
""
],
[
"Sivarani",
"T.",
""
],
[
"Andersen",
"J.",
""
],
[
"Barbuy",
"B.",
""
],
[
"Depagne",
"E.",
""
],
[
"Nordström",
"B.",
""
],
[
"Primas",
"F.",
""
]
] | [
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] |
712.295 | Ira Schwartz | Eric Forgoston and Ira B. Schwartz | Delay Induced Instabilities in Self-Propelling Swarms | 4 pages, 5 figures Final revision to appear in PRE Rapid
Communications | null | 10.1103/PhysRevE.77.035203 | null | nlin.AO nlin.PS | null | We consider a general model of self-propelling particles interacting through
a pairwise attractive force in the presence of noise and communication time
delay. Previous work by Erdmann, et al. [Phys. Rev. E {\bf 71}, 051904 (2205)]
has shown that a large enough noise intensity will cause a translating swarm of
individuals to transition to a rotating swarm with a stationary center of mass.
We show that with the addition of a time delay, the model possesses a
transition that depends on the size of the coupling amplitude. This transition
is independent of the initial swarm state (traveling or rotating) and is
characterized by the alignment of all of the individuals along with a swarm
oscillation. By considering the mean field equations without noise, we show
that the time delay induced transition is associated with a Hopf bifurcation.
The analytical result yields good agreement with numerical computations of the
value of the coupling parameter at the Hopf point.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:06:41 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 18:43:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Forgoston",
"Eric",
""
],
[
"Schwartz",
"Ira B.",
""
]
] | [
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] |
712.2951 | Wenhua Hai | Wenhua Hai, Shiguang Rong, Qianquan Zhu | Discrete chaotic states of a Bose-Einstein condensate | 7 pages, 5 figures | Phys. Rev. E 78, 066214 (2008) | 10.1103/PhysRevE.78.066214 | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find the different spatial chaos in a one-dimensional attractive
Bose-Einstein condensate interacting with a Gaussian-like laser barrier and
perturbed by a weak optical lattice. For the low laser barrier the chaotic
regions of parameters are demonstrated and the chaotic and regular states are
illustrated numerically. In the high barrier case, the bounded perturbed
solutions which describe a set of discrete chaotic states are constructed for
the discrete barrier heights and magic numbers of condensed atoms. The chaotic
density profiles are exhibited numerically for the lowest quantum number, and
the analytically bounded but numerically unbounded Gaussian-like configurations
are confirmed. It is shown that the chaotic wave packets can be controlled
experimentally by adjusting the laser barrier potential.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:06:44 GMT"
},
{
"version": "v2",
"created": "Thu, 22 Jan 2009 06:14:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hai",
"Wenhua",
""
],
[
"Rong",
"Shiguang",
""
],
[
"Zhu",
"Qianquan",
""
]
] | [
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] |
712.2952 | Zoltan Esik | S. L. Bloom, Z. Esik, W. Kuich | Partial Conway and iteration semirings | null | null | null | null | cs.DM cs.LO | null | A Conway semiring is a semiring $S$ equipped with a unary operation $^*:S \to
S$, always called 'star', satisfying the sum star and product star identities.
It is known that these identities imply a Kleene type theorem. Some
computationally important semirings, such as $N$ or $N^{\rat}\llangle \Sigma^*
\rrangle$ of rational power series of words on $\Sigma$ with coefficients in
$N$, cannot have a total star operation satisfying the Conway identities. We
introduce here partial Conway semirings, which are semirings $S$ which have a
star operation defined only on an ideal of $S$; when the arguments are
appropriate, the operation satisfies the above identities. We develop the
general theory of partial Conway semirings and prove a Kleene theorem for this
generalization.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:14:38 GMT"
}
] | 2015-03-13T00:00:00 | [
[
"Bloom",
"S. L.",
""
],
[
"Esik",
"Z.",
""
],
[
"Kuich",
"W.",
""
]
] | [
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] |
712.2953 | Feng-Kun Guo | Feng-Kun Guo, Siegfried Krewald, Ulf-G. Meissner | Hadronic-loop induced mass shifts in scalar heavy-light mesons | 14 pages, 2 figures. Version accepted for publication in Phys. Lett.
B | Phys.Lett.B665:157-163,2008 | 10.1016/j.physletb.2008.06.008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the mass shifts of heavy-light scalar mesons due to hadronic
loops under the assumption that these vanish for the groundstate heavy-light
mesons. The results show that the masses calculated in quark models can be
reduced significantly. We stress that the mass alone is not a signal for a
molecular interpretation. Both the resulting mass and the width suggest the
observed $D_0^*$ state could be a dressed $c\bar q$ state. We give further
predictions for the bottom scalar mesons which can be used to test the dressing
mechanism.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:41:42 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jun 2008 12:15:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Guo",
"Feng-Kun",
""
],
[
"Krewald",
"Siegfried",
""
],
[
"Meissner",
"Ulf-G.",
""
]
] | [
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] |
712.2954 | Rumin Wang | C. S. Kim, Ru-Min Wang | Study of the exclusive $b \to u \ell^- \bar{\nu}_{\ell}$ decays in the
MSSM with and without R-parity violation | 28 pages and 10 figures | Phys.Rev.D77:094006,2008 | 10.1103/PhysRevD.77.094006 | null | hep-ph | null | We study the exclusive $b \to u \ell^- \bar{\nu}_{\ell} (\ell=\tau,\mu,e)$
decays in the MSSM with and without R-parity violation. From the experimental
measurements of branching ratios $\mathcal{B}(B^-_u \to \tau^-
\bar{\nu}_{\tau})$, $\mathcal{B}(B^-_u \to M'^0 \ell'^- \bar{\nu}_{\ell'})$ and
$\mathcal{B}(\bar{B}^0_d \to M'^+ \ell'^- \bar{\nu}_{\ell'})$ $(\ell'=\mu,e,
M'=\pi,\rho)$, we derive new upper bounds on the relevant new physics
parameters within the decays. Using the constrained new physics parameter
spaces, we predict the charged Higgs effects and the R-parity violating effects
on the branching ratios, the normalized forward-backward asymmetries of charged
leptons, and the ratios of longitudinal to transverse polarization of the
vector mesons, which have not been measured or have not been well measured yet.
We find that the charged Higgs effects and the R-parity violating effects could
be large and measurable in some cases. Our results could be used to probe new
physics effects in the leptonic decays as well as the semileptonic decays, and
will correlate with searches for direct supersymmetric signals in future
experiments.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:19:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"C. S.",
""
],
[
"Wang",
"Ru-Min",
""
]
] | [
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] |
712.2955 | Lilia Boeri | L. Boeri, J. S. Kim, M. Giantomassi, F. S. Razavi, S. Kuroiwa, J.
Akimitsu, R. K. Kremer | Pressure effects on the superconducting transition in nH-CaAlSi | 6 pages, 5 figures | null | 10.1103/PhysRevB.77.144502 | null | cond-mat.supr-con cond-mat.mtrl-sci | null | We present a combined experimental and theoretical study of the effects of
pressure on T_c of the hexagonal layered superconductors nH-CaAlSi (n = 1, 5,
6), where nH labels the different stacking variants that were recently
discovered. Experimentally, the pressure dependence of T_c has been
investigated by measuring the magnetic susceptibility of single crystals up to
10 kbar. In contrast to previous results on polycrystalline samples, single
crystals with different stacking sequences display different pressure
dependences of T_c. 1H-CaAlSi shows a decrease of T_c with pressure, whereas 5H
and 6H-CaAlSi exhibit an increase of T_c with pressure. Ab-initio calculations
for 1H, 5H and 6H -CaAlSi reveal that an ultrasoft phonon branch associated to
out-of-plane vibrations of the Al-Si layers softens with pressure, leading to a
structural instability at high pressures. For 1H-CaAlSi the softening is not
sufficient to cause an increase of T_c, which is consistent with the present
experiments, but adverse to previous reports. For 5H and 6H the softening
provides the mechanism to understand the observed increase of T_c with
pressure. Calculations for hypothetical 2H and 3H stacking variants reveal
qualitative and quantitative differences.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:22:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Boeri",
"L.",
""
],
[
"Kim",
"J. S.",
""
],
[
"Giantomassi",
"M.",
""
],
[
"Razavi",
"F. S.",
""
],
[
"Kuroiwa",
"S.",
""
],
[
"Akimitsu",
"J.",
""
],
[
"Kremer",
"R. K.",
""
]
] | [
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] |
712.2956 | Thomas Salzburger | Thomas Salzburger, Helmut Ritsch | Twin stimulated amplification of light and matter waves in an
atom-photon pair laser | null | null | 10.1103/PhysRevA.77.063620 | null | quant-ph | null | We consider ultracold atoms in a far detuned optical lattice orientated
across a high-Q optical resonator. Applying an external driving laser to the
atoms, which is red detuned from the cavity mode by one vibrational quantum,
induces cavity-enhanced sideband cooling. For a dense and cold enough atomic
ensemble we predict an oscillation threshold for optical Raman sideband lasing
concurrent with coherent matter-wave amplification. Above this oscillation
threshold photons and atoms in the lowest band are dominantly created pairwise
via stimulated emission with a strong suppression of competing spontaneous
processes. In close analogy to a nondegenerate parametric oscillator we find
sub-Poissonian photon statistics and almost perfect nonclassical atom-photon
number correlations. Injecting atoms in higher vibrational bands via tunneling
or incoherent scattering then leads to continuous, simultaneous generation of a
coherent atom beam and laser light with nonclassical atom-field correlations.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:26:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Salzburger",
"Thomas",
""
],
[
"Ritsch",
"Helmut",
""
]
] | [
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] |
712.2957 | Decio Levi | G. Dattoli, D. Levi, P. Winternitz | Heisenberg Algebra, Umbral Calculus and Orthogonal Polynomials | 19 pages, 5 figures | null | 10.1063/1.2909731 | null | math-ph math.MP | null | Umbral calculus can be viewed as an abstract theory of the Heisenberg
commutation relation $[\hat P,\hat M]=1$. In ordinary quantum mechanics $\hat
P$ is the derivative and $\hat M$ the coordinate operator. Here we shall
realize $\hat P$ as a second order differential operator and $\hat M$ as a
first order integral one. We show that this makes it possible to solve large
classes of differential and integro-differential equations and to introduce new
classes of orthogonal polynomials, related to Laguerre polynomials. These
polynomials are particularly well suited for describing so called flatenned
beams in laser theory
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:28:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dattoli",
"G.",
""
],
[
"Levi",
"D.",
""
],
[
"Winternitz",
"P.",
""
]
] | [
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] |
712.2958 | Joel Goossens | Vincent N\'elis, Jo\"el Goossens, Nicolas Navet, Raymond Devillers and
Dragomir Milojevic | Power-Aware Real-Time Scheduling upon Identical Multiprocessor Platforms | The manuscript corresponds to the final version of SUTC 2008
conference | null | null | null | cs.OS | null | In this paper, we address the power-aware scheduling of sporadic
constrained-deadline hard real-time tasks using dynamic voltage scaling upon
multiprocessor platforms. We propose two distinct algorithms. Our first
algorithm is an off-line speed determination mechanism which provides an
identical speed for each processor. That speed guarantees that all deadlines
are met if the jobs are scheduled using EDF. The second algorithm is an on-line
and adaptive speed adjustment mechanism which reduces the energy consumption
while the system is running.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:42:45 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Mar 2008 16:10:50 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Nélis",
"Vincent",
""
],
[
"Goossens",
"Joël",
""
],
[
"Navet",
"Nicolas",
""
],
[
"Devillers",
"Raymond",
""
],
[
"Milojevic",
"Dragomir",
""
]
] | [
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] |
712.2959 | Te Sun Han | Te Sun Han | Joint Source-Channel Coding Revisited: Information-Spectrum Approach | null | null | null | null | cs.IT math.IT | null | Given a general source with countably infinite source alphabet and a general
channel with arbitrary abstract channel input/channel output alphabets, we
study the joint source-channel coding problem from the information-spectrum
point of view. First, we generalize Feinstein's lemma (direct part) and
Verdu-Han's lemma (converse part) so as to be applicable to the general joint
source-channel coding problem. Based on these lemmas, we establish a sufficient
condition as well as a necessary condition for the source to be reliably
transmissible over the channel with asymptotically vanishing probability of
error. It is shown that our sufficient condition is equivalent to the
sufficient condition derived by Vembu, Verdu and Steinberg, whereas our
necessary condition is shown to be stronger than or equivalent to the necessary
condition derived by them. It turns out, as a direct consequence, that
separation principle in a relevantly generalized sense holds for a wide class
of sources and channels, as was shown in a quite dfifferent manner by Vembu,
Verdu and Steinberg. It should also be remarked that a nice duality is found
between our necessary and sufficient conditions, whereas we cannot fully enjoy
such a duality between the necessary condition and the sufficient condition by
Vembu, Verdu and Steinberg. In addition, we demonstrate a sufficient condition
as well as a necessary condition for the epsilon-transmissibility. Finally, the
separation theorem of the traditional standard form is shown to hold for the
class of sources and channels that satisfy the semi-strong converse property.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:33:58 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Han",
"Te Sun",
""
]
] | [
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] |
712.296 | Cristiano De Michele | Cristiano De Michele, Rolf Schilling, Francesco Sciortino | Event-Driven Simulation of the Dynamics of Hard Ellipsoids | Proceedings of IWCS2007 Sendai (Japan) | null | 10.1063/1.2897771 | null | cond-mat.soft cond-mat.mtrl-sci | null | We introduce a novel algorithm to perform event-driven simulations of hard
rigid bodies of arbitrary shape, that relies on the evaluation of the geometric
distance. In the case of a monodisperse system of uniaxial hard ellipsoids,we
perform molecular dynamics simulations varying the aspect-ratio X0 and the
packing fraction phi. We evaluate the translational Dtrans and the rotational
Drot diffusion coefficient and the associated isodiffusivity lines in the
phi-X0 plane. We observe a decoupling of the translational and rotational
dynamics which generates an almost perpendicular crossing of the Dtrans and
Drot isodiffusivity lines. While the self intermediate scattering function
exhibits stretched relaxation, i.e. glassy dynamics, only for large phi and X0
about equals to 1, the second order orientational correlator C2(t) shows
stretching only for large and small X0 values. We discuss these findings in the
context of a possible pre-nematic order driven glass transition.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:45:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"De Michele",
"Cristiano",
""
],
[
"Schilling",
"Rolf",
""
],
[
"Sciortino",
"Francesco",
""
]
] | [
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] |
712.2961 | Marina Burlak | Marina Burlak | The frequency distribution of the height above the Galactic plane for
the novae | 11 pages, 2 figures, 1 table | null | null | null | astro-ph | null | In order to examine the hypothesis of the existence of two different kinds of
nova populations in the Galaxy - 'disk' novae and 'bulge' novae - the frequency
distribution in the z-direction was obtained for 64 novae. The fact that large
number of fast novae related to disk novae are found at a significant distance
from the Galactic plane (up to z~3700 pc) can't result from photometric
measurements errors. Slow novae considered to belong to bulge novae show more
close concentration to the Galactic plane (z<1700 pc). A Kolmogorov-Smirnov
test run on the data showed that the two populations hypothesis probability
amounts to 95.56%.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:35:07 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Burlak",
"Marina",
""
]
] | [
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] |
712.2962 | Maria Julia Redondo | Ibrahim Assem, Maria Julia Redondo | The first Hochschild cohomology group of a schurian cluster-tilted
algebra | 17 pages | Manuscripta Math. 128 (2009), no. 3, 373-388 | null | null | math.RA math.RT | null | Given a cluster-tilted algebra B we study its first Hochschild cohomology
group HH^1(B) with coefficients in the B-B-bimodule B. We find several
consequences when B is representation-finite, and also in the case where B is
cluster-tilted of type \tilde{\mathbb{A}}.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 13:51:56 GMT"
}
] | 2010-11-01T00:00:00 | [
[
"Assem",
"Ibrahim",
""
],
[
"Redondo",
"Maria Julia",
""
]
] | [
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] |
712.2963 | Mehdi Saeedi | Mehdi Saeedi, Morteza Saheb Zamani, Mehdi Sedighi | Algebraic Characterization of CNOT-Based Quantum Circuits with its
Applications on Logic Synthesis | 8 pages, 13 figures, 10Th EUROMICRO Conference on Digital System
Design, Architectures, Methods and Tools, Germany, 2007 | null | 10.1109/DSD.2007.4341490 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exponential speed up of quantum algorithms and the fundamental limits of
current CMOS process for future design technology have directed attentions
toward quantum circuits. In this paper, the matrix specification of a broad
category of quantum circuits, i.e. CNOT-based circuits, are investigated. We
prove that the matrix elements of CNOT-based circuits can only be zeros or
ones. In addition, the columns or rows of such a matrix have exactly one
element with the value of 1. Furthermore, we show that these specifications can
be used to synthesize CNOT-based quantum circuits. In other words, a new scheme
is introduced to convert the matrix representation into its SOP equivalent
using a novel quantum-based Karnaugh map extension. We then apply a
search-based method to transform the obtained SOP into a CNOT-based circuit.
Experimental results prove the correctness of the proposed concept.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:00:19 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Apr 2010 08:47:21 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"Saeedi",
"Mehdi",
""
],
[
"Zamani",
"Morteza Saheb",
""
],
[
"Sedighi",
"Mehdi",
""
]
] | [
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] |
712.2964 | Hendrik Bartko | H. Bartko, W. Bednarek | Gamma-Ray Emission from PWNe Interacting with Molecular Clouds | accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.12870.x | MPP-2007-192 | astro-ph | null | We consider a situation in which a pulsar is formed inside or close to a high
density region of a molecular cloud. Right after birth, the pulsar was very
active and accelerated hadrons and leptons to very high energies. Hadrons
diffuse through the supernova remnant (SNR) and some of them are trapped in the
nearby cloud interacting with the matter. We extend a recent time-dependent
model for the gamma-radiation of pulsar wind nebulae (PWNe) to describe this
more complicated astrophysical scenario. The example calculations have been
performed for two objects, IC443 and W41, which have recently been discovered
as sources of TeV gamma-rays. In this model the low energy TeV emission should
be correlated with the birth place of the pulsar and the region of dense soft
radiation rather than with its present position, provided that the injection
rate of relativistic particles into the PWNa has been much more efficient at
early times. The high energy TeV emission should be correlated with the
location of dense clouds which were able to capture high energy hadrons due to
their strong magnetic fields.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:19:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bartko",
"H.",
""
],
[
"Bednarek",
"W.",
""
]
] | [
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] |
712.2965 | Thomas G. Rizzo | Carola F. Berger, James S. Gainer, JoAnne L. Hewett, Ben Lillie,
Thomas G. Rizzo | General Features of Supersymmetric Signals at the ILC: Solving the LHC
Inverse Problem | 102 pages, 75 figures; discussion added, typos fixed | Phys.Rev.D80:095018,2009 | 10.1103/PhysRevD.80.095018 | SLAC-PUB-12797 | hep-ph hep-ex | null | We present the first detailed, large-scale study of the Minimal
Supersymmetric Standard Model (MSSM) at a $\sqrt s=500$ GeV International
Linear Collider, including full Standard Model backgrounds and detector
simulation. We investigate 242 points in the MSSM parameter space, which we
term models, that have been shown by Arkani-Hamed et al to be difficult to
study at the LHC. In fact, these points in MSSM parameter space correspond to
162 pairs of models which give indistinguishable signatures at the LHC, giving
rise to the so-called LHC Inverse Problem. We first determine whether the
production of the various SUSY particles is visible above the Standard Model
background for each of these parameter space points, and then make a detailed
comparison of their various signatures. Assuming an integrated luminosity of
500 fb$^{-1}$, we find that only 82 out of 242 models lead to visible
signatures of some kind with a significance $\geq 5$ and that only 57(63) out
of the 162 model pairs are distinguishable at $5(3)\sigma$. Our analysis
includes PYTHIA and CompHEP SUSY signal generation, full matrix element SM
backgrounds for all $2\to 2, 2\to 4$, and $2\to 6$ processes, ISR and
beamstrahlung generated via WHIZARD/GuineaPig, and employs the fast SiD
detector simulation org.lcsim.
| [
{
"version": "v1",
"created": "Mon, 17 Dec 2007 23:54:20 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 15:45:47 GMT"
}
] | 2009-11-18T00:00:00 | [
[
"Berger",
"Carola F.",
""
],
[
"Gainer",
"James S.",
""
],
[
"Hewett",
"JoAnne L.",
""
],
[
"Lillie",
"Ben",
""
],
[
"Rizzo",
"Thomas G.",
""
]
] | [
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] |
712.2966 | Nils Lavesson | Nils Lavesson, Leif Lonnblad | Merging parton showers and matrix elements -- back to basics | null | JHEP 0804:085,2008 | 10.1088/1126-6708/2008/04/085 | LU-TP 07-38 | hep-ph | null | We make a thorough comparison between different schemes of merging
fixed-order tree-level matrix element generators with parton-shower models. We
use the most basic benchmark of the O(alpha_S) correction to e+e- -> jets,
where the simple kinematics allows us to study in detail the transition between
the matrix-element and parton-shower regions. We find that the CKKW-based
schemes give a reasonably smooth transition between these regions, although
problems may occur if the parton shower used is not ordered in transverse
momentum. However, the so-called Pseudo-Shower and MLM schemes turn out to have
potentially serious problems due to different scale definitions in different
regions of phase space, and due to sensitivity to the details in the initial
conditions of the parton shower programs used.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:09:55 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Apr 2008 09:11:56 GMT"
}
] | 2009-04-30T00:00:00 | [
[
"Lavesson",
"Nils",
""
],
[
"Lonnblad",
"Leif",
""
]
] | [
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] |
712.2967 | Malek Zareyan | G. Mohammadkhani, M. Zareyan, and Ya. M. Blanter | Magnetic interference pattern in planar SNS Josephson junctions | 6 pages, 4 figures, Accepted by Phys. Rev. B | Phys. Rev. B 77, 014520 (2008) | 10.1103/PhysRevB.77.014520 | null | cond-mat.supr-con cond-mat.mes-hall | null | We study the Josephson current through a ballistic normal metal layer of
thickness $D$ on which two superconducting electrodes are deposited within a
distance $L$ of each other. In the presence of an ({\it in-layer}) magnetic
field we find that the oscillations of the critical current $I_c(\Phi)$ with
the magnetic flux $\Phi$ are significantly different from an ordinary magnetic
interference pattern. Depending on the ratio $L/D$ and temperature,
$I_c(\Phi)$-oscillations can have a period smaller than flux quantum $\Phi_0$,
nonzero minima and damping rate much smaller than $1/\Phi$. Similar anomalous
magnetic interference pattern was recently observed experimentally.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:13:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mohammadkhani",
"G.",
""
],
[
"Zareyan",
"M.",
""
],
[
"Blanter",
"Ya. M.",
""
]
] | [
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] |
712.2968 | John F. Donoghue | Thibault Damour and John F. Donoghue | Constraints on the variability of quark masses from nuclear binding | 21 pages, 7 figures | Phys.Rev.D78:014014,2008 | 10.1103/PhysRevD.78.014014 | null | hep-ph hep-th nucl-th | null | Based on recent work on nuclear binding, we update and extend the anthropic
constraints on the light quark masses, with results that are more tightly
constrained than previously obtained. We find that heavy nuclei would fall
apart (because the attractive nuclear central potential becomes too weak) if
the sum of the light quark masses m_u+m_d would exceed their physical values by
64% (at 95% confidence level). We summarize the anthropic constraints that
follow from requiring the existence both of heavy atoms and of hydrogen. With
the additional assumption that the quark Yukawa couplings do not vary, these
constraints provide a remarkably tight anthropic window for the Higgs vacuum
expectation value: 0.39 < v/v_physical < 1.64.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:21:35 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Damour",
"Thibault",
""
],
[
"Donoghue",
"John F.",
""
]
] | [
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] |
712.2969 | Tord Riemann | J. Gluza and T. Riemann | New results for 5-point functions | 9 pages, 1 figure, to appear in Proc. of Linear Collider Workshop
2007 (LCWS 07), Hamburg (Germany), May 30 - June 3, 2007 | ECONF C0705302:LOOP01,2007 | null | DESY 07-013, HEPTOOLS 07-086, SFB/CPP-07-86 | hep-ph | null | Bhabha scattering is one of the processes at the ILC where high precision
data will be expected. The complete NNLO corrections include radiative loop
corrections, with contributions from Feynman diagrams with five external legs.
We take these diagrams as an example and discuss several features of the
evaluation of pentagon diagrams. The tensor functions are usually reduced to
simpler scalar functions. Here we study, as an alternative, the application of
Mellin-Barnes representations to 5-point functions. There is no evidence for an
improved numerical evaluation of their finite, physical parts. However, the
approach gives interesting insights into the treatment of the IR-singularities.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:23:11 GMT"
}
] | 2009-02-16T00:00:00 | [
[
"Gluza",
"J.",
""
],
[
"Riemann",
"T.",
""
]
] | [
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712.297 | Anette Wr{\aa}lsen | Anette Wr{\aa}lsen | Rigid objects in higher cluster categories | 2nd version 17 pages. More details have been added and some proofs
have been improved. Some references have also been added | null | null | null | math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study maximal $m$-rigid objects in the $m$-cluster category $\mathcal
C_H^m$ associated with a finite dimensional hereditary algebra $H$ with $n$
nonisomorphic simple modules. We show that all maximal $m$-rigid objects in
these categories have exactly $n$ nonisomorphic indecomposable summands, and
that any almost complete $m$-rigid object in $\mathcal C_H^m$ has exactly $m+1$
nonisomorphic complements. We also show that the maximal $m$-rigid objects and
the $m$-cluster tilting objects in these categories coincide, and that the
class of finite dimensional algebras associated with maximal $m$-rigid objects
is closed under certain factor algebras.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:23:12 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Feb 2009 16:11:40 GMT"
}
] | 2009-02-10T00:00:00 | [
[
"Wrålsen",
"Anette",
""
]
] | [
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712.2971 | Rui Azevedo | R. Azevedo, N. Calvet, L. Hartmann, D.Folha, F.Gameiro, J. Muzerolle | CaII Infrared triplet line models in Classical T Tauri stars | null | Astron.Astrophys.225:456,2006 | 10.1051/0004-6361:20054315 | null | astro-ph | null | We study the formation of the calcium II infrared triplet lines 8498\AA,
8542\AA and 8662\AA, in the accreting magnetospheric flows of Classical T Tauri
stars (CTTS), and present a grid of models for a large range of magnetospheric
conditions. We apply our models to the interpretation of multi epoch
observations of the CTTS DI Cep. We find that these lines form in the
magnetospheric infall and that the variability of the CaII triplet lines in DI
Cep can be explained in the context of changes in the mass accretion
rate/temperature of the accretion column gas.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:26:10 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Azevedo",
"R.",
""
],
[
"Calvet",
"N.",
""
],
[
"Hartmann",
"L.",
""
],
[
"Folha",
"D.",
""
],
[
"Gameiro",
"F.",
""
],
[
"Muzerolle",
"J.",
""
]
] | [
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] |
712.2972 | Ricardo Sa Earp | Ricardo Sa Earp and Eric Toubiana | An asymptotic theorem for minimal surfaces and existence results for
minimal graphs in $H^2 \times R$ | This paper was presented in the International Congress on Minimal and
Constant Mean Curvature Surfaces, Buzios, Brazil, August 2007 (27 pages 7
figures) | null | null | null | math.DG | null | In this paper we prove a general and sharp Asymptotic Theorem for minimal
surfaces in $H^2\times R$. As a consequence, we prove that there is no properly
immersed minimal surface whose asymptotic boundary $C$ is a Jordan curve
homologous to zero in the asymptotic boundary of $ H^2\times R,$ say
$\partial_\infty H^2\times R$, such that $C$ is contained in a slab between two
horizontal circles of $\partial_\infty H^2\times R$ with width equal to $\pi.$
We construct minimal vertical graphs in $H^2\times R$ over certain unbounded
admissible domains taking certain prescribed finite boundary data and certain
prescribed asymptotic boundary data. Our admissible unbounded domains $\Om$ in
$H^2\times \{0\}$ are non necessarily convex and non necessarily bounded by
convex arcs; each component of its boundary is properly embedded with zero, one
or two points on its asymptotic boundary, satisfying a further geometric
condition.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 00:11:43 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Earp",
"Ricardo Sa",
""
],
[
"Toubiana",
"Eric",
""
]
] | [
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712.2973 | Joana Sousa | J. C. Sousa and M. S. Cunha | Towards the undestanding of radial velocity pulsation in roAp stars | 5 pages and 5 figures | J.Phys.Conf.Ser.118:012074,2008 | 10.1088/1742-6596/118/1/012074 | null | astro-ph | null | High-resolution spectroscopic time series of rapidly oscillating Ap stars
show evidence for a co-existence of standing and running waves in their
atmospheric layers. With the purpose of understanding these observations we
have carried out a theoretical analysis of the pulsations in the outermost
layers of these stars, starting from the simplest possible model that still
retains all important physical ingredients. In our analysis we considered an
isothermal atmosphere in a plane-parallel approximation. Moreover we assumed
that in the region considered the magnetic pressure is much larger than the gas
pressure and, consequently, that the magnetoacoustic wave has decoupled into
its acoustic and magnetic components. Using the analytical solutions for the
velocity components appropriate to this model we estimate the velocity
component parallel to the line of sight averaged over the visible stellar disk.
Fitting the latter to a function of the form Acos($\sigma$t+phase), with
$\sigma$ the dimensionless oscillation frequency and t the dimensionless time,
we derive the amplitude A and the phase for our model as function of height in
the atmosphere.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:35:20 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Sousa",
"J. C.",
""
],
[
"Cunha",
"M. S.",
""
]
] | [
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] |
712.2974 | Roland Speicher | Roland Speicher | On the rate of convergence and Berry-Esseen type theorems for a
multivariate free central limit theorem | 14 pages | null | null | null | math.OA | null | We address the question of a Berry Esseen type theorem for the speed of
convergence in a multivariate free central limit theorem. For this, we estimate
the difference between the operator-valued Cauchy transforms of the normalized
partial sums in an operator-valued free central limit theorem and the Cauchy
transform of the limiting operator-valued semicircular element.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:36:41 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Speicher",
"Roland",
""
]
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] |
712.2975 | Loredana Prisinzano | L. Prisinzano (1), G. Micela (1), E. Flaccomio (1), J. R. Stauffer
(2), T. Megeath (3), L. Rebull (2), M. Robberto (4), K. Smith (4), E. D.
Feigelson (5), N. Grosso (6), S. Wolk (7) ((1) INAF - Osservatorio
Astronomico di Palermo, Italy (2) Spitzer Science Center, California
Institute of Technology, Pasadena, CA (3) Department of Physics, University
of Toledo, OH (4) Space Telescope Science Institute, Baltimore, MD (5)
Department of Astronomy and Astrophysics, Penn State University PA, USA (6)
Observatoire astronomique de Strasbourg, Universite' Louis-Pasteur, CNRS,
INSU, Strasbourg, France (7) Harvard Smithsonian Center for Astrophysics,
Cambridge) | X-ray properties of protostars in the Orion Nebula | Comments: 38 pages, 14 Postscript figures, 14 Tables. Accepted for
publication in ApJ | null | 10.1086/528842 | null | astro-ph | null | The origin and evolution of the X-rays in very young stellar objects (YSOs)
are not yet well understood since it is very hard to observe YSOs in the
protostellar phase. We study the X-ray properties of Class 0-I objects in the
Orion Nebula Cluster (ONC) and compare them with those of the more evolved
Class II and III members. Using Chandra Orion Ultradeep Project (COUP) data, we
study the X-ray properties of stars in different evolutionary classes:
luminosities, NH, temperatures and time variability are compared in order to
understand if the interaction between the circumstellar material and the
central object can influence the X-ray emission. We have assembled the deepest
and most complete photometric catalog of objects in the ONC region from the UV
to 8 microns using data from HST, [email protected] ESO and ISPI@4m CTIO telescopes, and
Spitzer IRAC. We select high probability candidate Class 0-I protostars,
distinguishing between those having a spectral energy distribution which rises
from K up to 8 microns (Class 0-Ia) from those where the SED rises from K up to
4.5 microns and decreasing afterwards (Class 0-Ib). We select a sample of bona
fide Class II stars and a set of Class III stars with IR emission consistent
with normal photospheres. Our principal result is that Class 0-Ia objects are
significantly less luminous in X-rays, both in the total and hard bands, than
the more evolved Class II stars with mass larger than 0.5 Msun; these latter
show X-ray luminosities similar to those of Class 0-Ib stars. This result
supports the hypothesis that the onset of X-ray emission occurs at a very early
stage of star formation. Temporal variability and spectral properties of Class
0-I stars are similar to those of the more evolved Class II and III objects,
except for a larger absorption likely due to gas in the circumstellar material.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 15:14:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Prisinzano",
"L.",
""
],
[
"Micela",
"G.",
""
],
[
"Flaccomio",
"E.",
""
],
[
"Stauffer",
"J. R.",
""
],
[
"Megeath",
"T.",
""
],
[
"Rebull",
"L.",
""
],
[
"Robberto",
"M.",
""
],
[
"Smith",
"K.",
""
],
[
"Feigelson",
"E. D.",
""
],
[
"Grosso",
"N.",
""
],
[
"Wolk",
"S.",
""
]
] | [
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712.2976 | Massimo Bianchi | Massimo Bianchi and Sergio Ferrara | Enriques and Octonionic Magic Supergravity Models | 24 pages | JHEP 0802:054,2008 | 10.1088/1126-6708/2008/02/054 | CERN-PH-TH/256, ROM2F/2007/22, UCLA/07/TEP/29 | hep-th | null | We reconsider the Enriques Calabi Yau (FHSV) model and its string derivation
and argue that the Octonionic magic supergravity theory admits a string
interpretation closely related to the Enriques model. The uplift to D=6 of the
Octonionic magic model has 16 abelian vectors related to the rank of Type I and
Heterotic strings.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:48:44 GMT"
}
] | 2009-12-10T00:00:00 | [
[
"Bianchi",
"Massimo",
""
],
[
"Ferrara",
"Sergio",
""
]
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] |
712.2977 | Massimo Cappi | M. Cappi (1), F. Tombesi (1,2), and M. Giustini (1,2) ((1) INAF-IASF
Bologna, (2) Universita' degli Studi di Bologna) | Outflows and winds in AGNs: a case for Simbol-X | 5 pages, 6 figures, to appear in proceedings of "Simbol-X: the hard
X-ray Universe in focus", held in Bologna (Italy), May 14-16, 2007 | null | null | null | astro-ph | null | Chandra and XMM-Newton X-ray observations are accumulating evidence for
massive, high velocity outflows in Seyfert galaxies and quasars, most likely
originating very close to the central supermassive black hole. These results
are offering new potential to probe the launching regions of relativistic
jets/outflows, and to quantify their feedback impact on the host galaxy and/or
cluster of galaxies. The most important signature of these phenomena is the
detection of blueshifted absorption lines of highly ionized iron at energies
usually greater than ~7 keV. The lack of sensitivity of present day X-ray
observatories at these energies gives rise to bias against the detection of
more ``extreme'' outflows, with highest velocity and ionization, which would be
blueshifted at energies >10 keV. Thus, simulations with Simbol-X were carried
out to test its capability of detecting absorption lines/edges between 5-20
keV, in order to probe the dynamics (i.e. measurement of velocity variations)
of the absorbing gas, as well as the highest (up to relativistic speeds)
velocity and ionization components. We found that the unprecedented sensitivity
of Simbol-X between 5-30 keV is a great opportunity to obtain important
improvements in this research field.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:58:12 GMT"
}
] | 2007-12-19T00:00:00 | [
[
"Cappi",
"M.",
""
],
[
"Tombesi",
"F.",
""
],
[
"Giustini",
"M.",
""
]
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712.2978 | V. A. Kuz'menko | V. A. Kuz'menko | On the physical nature of Anderson localization effect | 6 pages, 2 figures, substantial text overlap with arXiv:0712.2978v1 | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An alternative explanation of the physical nature of Anderson localization
phenomenon and one of the most direct ways of its experimental study are
discussed.
| [
{
"version": "v1",
"created": "Tue, 18 Dec 2007 14:58:47 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Jan 2008 13:55:07 GMT"
},
{
"version": "v3",
"created": "Sat, 23 Feb 2008 08:06:30 GMT"
},
{
"version": "v4",
"created": "Tue, 3 Jun 2008 11:19:35 GMT"
},
{
"version": "v5",
"created": "Tue, 29 Jul 2008 08:43:37 GMT"
},
{
"version": "v6",
"created": "Fri, 5 Apr 2013 15:37:00 GMT"
}
] | 2013-04-08T00:00:00 | [
[
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""
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