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801.2073 | Leonardo Vanni | L. Vanni, R. Laura | Time translation of quantum properties | 17 pages | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the notion of time translation, we develop a formalism to deal with
the logic of quantum properties at different times. In our formalism it is
possible to enlarge the usual notion of context to include composed properties
involving properties at different times. We compare our results with the theory
of consistent histories.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 13:23:31 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Dec 2008 02:32:11 GMT"
}
] | 2008-12-03T00:00:00 | [
[
"Vanni",
"L.",
""
],
[
"Laura",
"R.",
""
]
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801.2074 | Gennady Kozlov | G.A. Kozlov | The flux-tube phase transition and bound states at high temperatures | 12 pages, 3 figures | Phys.Part.Nucl.Lett.5:506-514,2008 | 10.1134/S1547477108060046 | null | hep-ph | null | We consider the phase transition in the dual Yang-Mills theory at finite
temperature $T$. The phase transition is associated with a change (breaking) of
symmetry. The effective mass of the dual gauge field is derived as a function
of $T$-dependent gauge coupling constant. We investigate the analytical
criterion constraining the existence of a quark-antiquark bound state at
temperatures higher than the temperature of deconfinement.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:11:33 GMT"
}
] | 2010-05-27T00:00:00 | [
[
"Kozlov",
"G. A.",
""
]
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801.2075 | Wlodzimierz Jelonek | Wlodzimierz Jelonek | Neutral bi-Hermitian Gray surfaces | 12 pages | Topics in almost Hermitian geometry and related fields, World
Scientific Publishing (2005) | null | null | math.DG | null | The aim of this paper is to give examples of compact neutral 4-manifolds
$(M,g)$ whose Ricci tensor $\rho$ satisfies the relation $\nabla_X\rho(X,X)
=\frac13X\tau g(X,X)$. We present also a family of new Einstein bi-Hermitian
neutral metrics on ruled surfaces of genus $g>1$.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 13:42:36 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Jelonek",
"Wlodzimierz",
""
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] |
801.2076 | Yun-Wei Yu | Yun-Wei Yu, Zi-Gao Dai, Xiao-Ping Zheng | Neutrino emission from a GRB afterglow shock during an inner supernova
shock breakout | 6 pages, 2 figures, accepted for publication in MNRAS | MNRAS 385(2008)1461 | 10.1111/j.1365-2966.2008.12924.x | null | astro-ph | null | The observations of a nearby low-luminosity gamma-ray burst (GRB) 060218
associated with supernova SN 2006aj may imply an interesting astronomical
picture where a supernova shock breakout locates behind a relativistic GRB jet.
Based on this picture, we study neutrino emission for early afterglows of GRB
060218-like GRBs, where neutrinos are expected to be produced from photopion
interactions in a GRB blast wave that propagates into a dense wind.
Relativistic protons for the interactions are accelerated by an external shock,
while target photons are basically provided by the incoming thermal emission
from the shock breakout and its inverse-Compton scattered component. Because of
a high estimated event rate of low-luminosity GRBs, we would have more
opportunities to detect afterglow neutrinos from a single nearby GRB event of
this type by IceCube. Such a possible detection could provide evidence for the
picture described above.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 13:55:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yu",
"Yun-Wei",
""
],
[
"Dai",
"Zi-Gao",
""
],
[
"Zheng",
"Xiao-Ping",
""
]
] | [
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] |
801.2077 | Detlef Klimm | S. Bin Anooz, R. Bertram and D. Klimm | The solid state phase transformation of potassium sulfate | 11 pages, 6 figures, 1 table | Solid State Communications 141 (2007) 497-501 | 10.1016/j.ssc.2006.12.008 | null | cond-mat.mtrl-sci physics.chem-ph | null | Potassium sulfate single crystals that are grown from aqueous solutions lose
upon the first heating up to 1% of mass that is assumed to be water. This mass
loss occurs in the vicinity of the PT from orthorhombic to hexagonal K2SO4.
Only in the first heating run of K2SO4 that has not yet released water,
pretransitional thermal effects can be observed in the DTA curve. If K2SO4
crystals are grown from solutions containing 4 wt.% Cd, Cu, or Fe, only Cu or
Fe can be incorporated significantly with concentrations of several 0.1%. The
phase transformation temperature measured for such solid solutions depends on
the heating rate. For pure K2SO4, the phase transformation temperature is
independent on heating rate 581.3 deg. C and the enthalpy of transformation is
(5.8+/-0.2) kJ/mol.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 13:59:06 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Anooz",
"S. Bin",
""
],
[
"Bertram",
"R.",
""
],
[
"Klimm",
"D.",
""
]
] | [
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] |
801.2078 | Norbert Schuch | Norbert Schuch, Michael M. Wolf, Karl Gerd H. Vollbrecht, J. Ignacio
Cirac | On entropy growth and the hardness of simulating time evolution | 15 pages. v2: Published version, Journal-Ref. added | New J. Phys. 10, 033032 (2008) | 10.1088/1367-2630/10/3/033032 | null | quant-ph cond-mat.str-el | null | The simulation of quantum systems is a task for which quantum computers are
believed to give an exponential speedup as compared to classical ones. While
ground states of one-dimensional systems can be efficiently approximated using
Matrix Product States (MPS), their time evolution can encode quantum
computations, so that simulating the latter should be hard classically.
However, one might believe that for systems with high enough symmetry, and thus
insufficient parameters to encode a quantum computation, efficient classical
simulation is possible. We discuss supporting evidence to the contrary: We
provide a rigorous proof of the observation that a time independent local
Hamiltonian can yield a linear increase of the entropy when acting on a product
state in a translational invariant framework. This criterion has to be met by
any classical simulation method, which in particular implies that every global
approximation of the evolution requires exponential resources for any MPS based
method.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 14:02:33 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Apr 2008 16:44:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schuch",
"Norbert",
""
],
[
"Wolf",
"Michael M.",
""
],
[
"Vollbrecht",
"Karl Gerd H.",
""
],
[
"Cirac",
"J. Ignacio",
""
]
] | [
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] |
801.2079 | Yuri Litvinov | Yu.A. Litvinov, F. Bosch, N. Winckler, D. Boutin, H.G. Essel, T.
Faestermann, H. Geissel, S. Hess, P. Kienle, R. Kn\"obel, C. Kozhuharov, J.
Kurcewicz, L. Maier, K. Beckert, P. Beller, C. Brandau, L. Chen, C.
Dimopoulou, B. Fabian, A. Fragner, E. Haettner, M. Hausmann, S.A. Litvinov,
M. Mazzocco, F. Montes, A. Musumarra, C. Nociforo, F. Nolden, W. Pla{\ss}, A.
Prochazka, R. Reda, R. Reuschl, C. Scheidenberger, M. Steck, T. St\"ohlker,
S. Torilov, M. Trassinelli, B. Sun, H. Weick, M. Winkler | Observation of Non-Exponential Orbital Electron Capture Decays of
Hydrogen-Like $^{140}$Pr and $^{142}$Pm Ions | 12 pages, 5 figures | null | 10.1016/j.physletb.2008.04.062 | null | nucl-ex hep-ph nucl-th | null | We report on time-modulated two-body weak decays observed in the orbital
electron capture of hydrogen-like $^{140}$Pr$^{59+}$ and $^{142}$Pm$^{60+}$
ions coasting in an ion storage ring. Using non-destructive single ion,
time-resolved Schottky mass spectrometry we found that the expected exponential
decay is modulated in time with a modulation period of about 7 seconds for both
systems. Tentatively this observation is attributed to the coherent
superposition of finite mass eigenstates of the electron neutrinos from the
weak decay into a two-body final state.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 14:08:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Litvinov",
"Yu. A.",
""
],
[
"Bosch",
"F.",
""
],
[
"Winckler",
"N.",
""
],
[
"Boutin",
"D.",
""
],
[
"Essel",
"H. G.",
""
],
[
"Faestermann",
"T.",
""
],
[
"Geissel",
"H.",
""
],
[
"Hess",
"S.",
""
],
[
"Kienle",
"P.",
""
],
[
"Knöbel",
"R.",
""
],
[
"Kozhuharov",
"C.",
""
],
[
"Kurcewicz",
"J.",
""
],
[
"Maier",
"L.",
""
],
[
"Beckert",
"K.",
""
],
[
"Beller",
"P.",
""
],
[
"Brandau",
"C.",
""
],
[
"Chen",
"L.",
""
],
[
"Dimopoulou",
"C.",
""
],
[
"Fabian",
"B.",
""
],
[
"Fragner",
"A.",
""
],
[
"Haettner",
"E.",
""
],
[
"Hausmann",
"M.",
""
],
[
"Litvinov",
"S. A.",
""
],
[
"Mazzocco",
"M.",
""
],
[
"Montes",
"F.",
""
],
[
"Musumarra",
"A.",
""
],
[
"Nociforo",
"C.",
""
],
[
"Nolden",
"F.",
""
],
[
"Plaß",
"W.",
""
],
[
"Prochazka",
"A.",
""
],
[
"Reda",
"R.",
""
],
[
"Reuschl",
"R.",
""
],
[
"Scheidenberger",
"C.",
""
],
[
"Steck",
"M.",
""
],
[
"Stöhlker",
"T.",
""
],
[
"Torilov",
"S.",
""
],
[
"Trassinelli",
"M.",
""
],
[
"Sun",
"B.",
""
],
[
"Weick",
"H.",
""
],
[
"Winkler",
"M.",
""
]
] | [
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801.208 | Michela Uslenghi | Michela Uslenghi (1), Isabella Pagano (2), Cristian Pontoni (2),
Salvatore Scuderi (2), Boris Shustov (3) ((1) INAF/IASF-Milano, (2)
INAF/Catania Astrophysical Observatory, (3) INASAN, Moscow) | The World Space Observatory (WSO-UV) - Current status | 6 pages, 5 figures; Chinese Journal for Astronomy and Astrophysics
(ChJAA), in press. Invited talk at the Frascati Workshop 2007 Vulcano
(Italy), May 28 - June 2 "Multifrequency Behaviour Of High Energy Cosmic
Sources" | null | null | null | astro-ph | null | This paper reports on the current status of the World Space Observatory
WSO-UV, a space mission for UV astronomy, planned for launch at the beginning
of next decade. It is based on a 1.7 m telescope, with focal plane instruments
including high resolution spectrographs, long slit low resolution spectrographs
and imaging cameras.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:04:03 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Uslenghi",
"Michela",
""
],
[
"Pagano",
"Isabella",
""
],
[
"Pontoni",
"Cristian",
""
],
[
"Scuderi",
"Salvatore",
""
],
[
"Shustov",
"Boris",
""
]
] | [
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] |
801.2081 | Lubomir Kovachev | Lubomir M. Kovachev | Propagation of localized optical waves in media with dispersion, in
dispersionless media and in vacuum. Low diffractive regime | Latex, 30 pages, 5 figures | null | null | null | physics.optics | null | We present a systematic study on linear propagation of ultrashort laser
pulses in media with dispersion, dispersionless media and vacuum. The applied
method of amplitude envelopes gives the opportunity to estimate the limits of
slowly warring amplitude approximation and to describe an amplitude
integro-differential equation, governing the propagation of optical pulses in
single cycle regime. The well known slowly varying amplitude equation and the
amplitude equation for vacuum are written in dimensionless form. Three
parameters are obtained defining different linear regimes of the optical pulses
evolution. In contrast to previous studies we demonstrate that in femtosecond
region the nonparaxial terms are not small and can dominate over transverse
Laplacian. The normalized amplitude nonparaxial equations are solved using the
method of Fourier transforms. Fundamental solutions with spectral kernels
different from Fresnel one are found. One unexpected new result is the relative
stability of light pulses with spherical and spheroidal spatial form, when we
compare their transverse enlargement with the paraxial diffraction of lights
beam in air. It is important to emphasize here the case of light disks, i.e.
pulses whose longitudinal size is small with respect to the transverse one,
which in some partial cases are practically diffractionless over distances of
thousand kilometers. A new formula which calculates the diffraction length of
optical pulses is suggested.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:07:39 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Kovachev",
"Lubomir M.",
""
]
] | [
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] |
801.2082 | Thomas Ward | S. Jaidee, S. Stevens and T. Ward | Mertens' theorem for toral automorphisms | Revised | Proceedings of the American Mathematical Society 139(05):
1819-1824 (2011) | 10.1090/S0002-9939-2010-10632-9 | null | math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A dynamical Mertens' theorem for ergodic toral automorphisms with error term
O(N^{-1}) is found, and the influence of resonances among the eigenvalues of
unit modulus is examined. Examples are found with many more, and with many
fewer, periodic orbits than expected.
| [
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801.2083 | S. Satheesh | S. Satheesh and E. Sandhya | Geometric Gamma Max-Infinitely Divisible Models | 6 Pages | null | null | null | math.PR math.ST stat.TH | null | A transformation of gamma max-infinitely divisible laws viz. geometric gamma
max-infinitely divisible laws is considered in this paper. Some of its
distributional and divisibility properties are discussed and a random time
changed extremal process corresponding to this distribution is presented. A new
kind of invariance (stability) under geometric maxima is proved and a max-AR(1)
model corresponding to it is also discussed.
| [
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"version": "v1",
"created": "Mon, 14 Jan 2008 14:26:30 GMT"
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801.2084 | Giovanni Carraro dr | Giovanni Carraro (ESO-Santiago), Andre' Moitinho (Lisboa), Ruben A.
Vazquez (La Plata) | Stellar populations in the Canis Major over-density | 9 pages, 12 eps figures (some of them somewhat degraded in
resolution), accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.12953.x | null | astro-ph | null | We performed a photometric multicolor survey of the core of the Canis Major
over-density at l 244, -8.0, reaching V = 22 and covering 0.3 x 1 degree. The
main aim is to unravel the complex mixture of stellar populations toward this
Galactic direction, where in the recent past important signatures of an
accretion event have been claimed to be detected. While our previous
investigations were based on disjointed pointings aimed at revealing the large
scale structure of the third Galactic Quadrant, we now focus on a complete
coverage of a smaller field centered on the Canis Major over-density. A large
wave-length baseline, in the UBVRI bands, allows us to build up a suite of
colour colour and colour magnitude diagrams, providing a much better diagnostic
tool to disentangle the stellar populations of the region. In fact, the simple
use of one colour magnitude diagram, widely employed in all the previous
studies defending the existence of the Canis Major galaxy, does not allow one
to separate the effects of the different parameters (reddening, age,
metallicity, and distance) involved in the interpretation of data, forcing to
rely on heavy modeling. In agreement with our previous studies in the same
general region of the Milky Way, we recognize a young stellar population
compatible with the expected structure and extension of the Local (Orion) and
Outer (Norma-Cygnus) spiral arms in the Third Galactic Quadrant. Moreover we
interpret the conspicuous intermediate-age metal poor population as belonging
to the Galactic thick disk, distorted by the effect of strong disk warping at
this latitude, and to the Galactic halo.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 14:42:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Carraro",
"Giovanni",
"",
"ESO-Santiago"
],
[
"Moitinho",
"Andre'",
"",
"Lisboa"
],
[
"Vazquez",
"Ruben A.",
"",
"La Plata"
]
] | [
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] |
801.2085 | Julian Fernandez Bonder | L. Del Pezzo, J. Fernandez Bonder | Some optimization problems for nonlinear elastic membranes | New version with corrections made by the referee | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study some optimization problems for nonlinear elastic
membranes. More precisely, we consider the problem of optimizing the cost
functional $\J(u)=\int_{\partial\Omega} f(x) u \rd \H^{N-1}$ over some
admissible class of loads $f$ where $u$ is the (unique) solution to the problem
$-\Delta_p u + |u|^{p-2}u = 0$ in $\Omega$ with $|\nabla u|^{p-2}u_\nu = f$ on
$\partial \Omega$.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 14:55:35 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jun 2008 12:16:19 GMT"
}
] | 2008-06-12T00:00:00 | [
[
"Del Pezzo",
"L.",
""
],
[
"Bonder",
"J. Fernandez",
""
]
] | [
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] |
801.2086 | Bouchet Laurent | L. Bouchet, E.Jourdain, J. P.Roques, A. Strong, R. Diehl, F. Lebrun,
and R. Terrier | INTEGRAL SPI All-Sky View in Soft Gamma Rays: Study of Point Source and
Galactic Diffuse Emissions | 28 pages, 10 figures. Astrophysical journal (accepted for
publication) | null | 10.1086/529489 | null | astro-ph | null | We have processed the data accumulated with INTEGRAL SPI during 4 years (~ 51
Ms) to study the Galactic ``diffuse'' emission morphology in the 20 keV to 8
MeV energy range. To achieve this objective, we have derived simultaneously an
all-sky census of emitting sources and images of the Galactic Ridge (GR)
emission. In the central radian, the resolved point source emission amounts to
88%, 91% and 68% of the total emission in the 25-50, 50-100 and 100-300 keV
domains respectively. We have compared the GR emission spatial distribution to
those obtained from CO and NIR maps, and quantified our results through
latitude and longitude profiles. Below 50 keV, the SPI data are better traced
by the latter, supporting a stellar origin for this emission. Furthermore, we
found that the GR emission spectrum follows a power law with a photon index ~
1.55 above 50 keV while an additional component is required below this energy.
This component shows a cutoff around 30 keV, reinforcing a stellar origin, as
proposed by Krivonos et al. (2007). The annihilation diffuse emission component
is extracted simultaneously, leading to the determination of the related
parameters (positronium flux and fraction). A specific discussion is devoted to
the annihilation line distribution since a significant emission is detected
over a region as large as ~80 degrees by ~10 degrees potentially associated
with the disk or halo surrounding the central regions of our Galaxy.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 14:56:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bouchet",
"L.",
""
],
[
"Jourdain",
"E.",
""
],
[
"Roques",
"J. P.",
""
],
[
"Strong",
"A.",
""
],
[
"Diehl",
"R.",
""
],
[
"Lebrun",
"F.",
""
],
[
"Terrier",
"R.",
""
]
] | [
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-0.0997131094,
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-0.026463449,
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] |
801.2087 | Nils Hollmann | N. Hollmann, M. W. Haverkort, M. Cwik, M. Benomar, M. Reuther, A.
Tanaka, T. Lorenz | Anisotropic Susceptibility of La_2-xSr_xCoO_4 related to the Spin States
of Cobalt | null | New J. of Phys. 10, 023018 (2008) | 10.1088/1367-2630/10/2/023018 | null | cond-mat.str-el | null | We present a study of the magnetic susceptibility of La_2-xSr_xCoO_4 single
crystals in a doping range 0.3<=x<=0.8. Our data shows a pronounced magnetic
anisotropy for all compounds. This anisotropy is in agreement with a low-spin
ground state (S=0) of Co^3+ for x>=0.4 and a high-spin ground state (S=3/2) of
Co^2+. We compare our data with a crystal-field model calculation assuming
local moments and find a good description of the magnetic behavior for x>=0.5.
This includes the pronounced kinks observed in the inverse magnetic
susceptibility, which result from the anisotropy and low-energy excited states
of Co^2+ and are not related to magnetic ordering or temperature-dependent
spin-state transitions.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 14:56:52 GMT"
}
] | 2008-05-27T00:00:00 | [
[
"Hollmann",
"N.",
""
],
[
"Haverkort",
"M. W.",
""
],
[
"Cwik",
"M.",
""
],
[
"Benomar",
"M.",
""
],
[
"Reuther",
"M.",
""
],
[
"Tanaka",
"A.",
""
],
[
"Lorenz",
"T.",
""
]
] | [
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] |
801.2088 | Alejandro Maass | Xavier Bressaud, Pascal Hubert, Alejandro Maass | Persistence of Wandering Intervals in Self-Similar Affine Interval
Exchange Transformations | null | null | null | null | math.DS cs.IT math.IT | null | In this article we prove that given a self-similar interval exchange
transformation T, whose associated matrix verifies a quite general algebraic
condition, there exists an affine interval exchange transformation with
wandering intervals that is semi-conjugated to it. That is, in this context the
existence of Denjoy counterexamples occurs very often, generalizing the result
of M. Cobo in [C].
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 14:57:11 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Bressaud",
"Xavier",
""
],
[
"Hubert",
"Pascal",
""
],
[
"Maass",
"Alejandro",
""
]
] | [
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] |
801.2089 | Miriam Ciavarella | Miriam Ciavarella, Lea Terracini | Some explicit constructions of integral structures in quaternion
algebras | null | null | null | null | math.NT math.AG | null | Let B be an undefined quaternion algebra over Q. Following the explicit
chacterization of some Eichler orders in B given by Hashimoto, we define
explicit embeddings of these orders in some local rings of matrices; we
describe the two natural inclusions of an Eichler order of leven Nq in an
Eichler order of level N. Moreover we provide a basis for a chain of Eichler
orders in B and prove results about their intersection.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:03:58 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jan 2008 13:31:16 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Ciavarella",
"Miriam",
""
],
[
"Terracini",
"Lea",
""
]
] | [
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] |
801.209 | Sebastiano Bernuzzi | Sebastiano Bernuzzi, Alessandro Nagar and Roberto De Pietri | Dynamical excitation of space-time modes of compact objects | RevTeX, 9 pages, 7 figures, Published in Phys. Rev. D | Phys.Rev.D77:044042,2008 | 10.1103/PhysRevD.77.044042 | null | gr-qc | null | We discuss, in the perturbative regime, the scattering of Gaussian pulses of
odd-parity gravitational radiation off a non-rotating relativistic star and a
Schwarzschild Black Hole. We focus on the excitation of the $w$-modes of the
star as a function of the width $b$ of the pulse and we contrast it with the
outcome of a Schwarzschild Black Hole of the same mass. For sufficiently narrow
values of $b$, the waveforms are dominated by characteristic space-time modes.
On the other hand, for sufficiently large values of $b$ the backscattered
signal is dominated by the tail of the Regge-Wheeler potential, the
quasi-normal modes are not excited and the nature of the central object cannot
be established. We view this work as a useful contribution to the comparison
between perturbative results and forthcoming $w$-mode 3D-nonlinear numerical
simulation.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:28:20 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Jan 2008 22:19:39 GMT"
},
{
"version": "v3",
"created": "Thu, 6 Mar 2008 17:02:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"De Pietri",
"Roberto",
""
]
] | [
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] |
801.2091 | A. R. P. Rau | D. Uskov and A. R. P. Rau | Geometric phases and Bloch sphere constructions for SU(N), with a
complete description of SU(4) | 9 pages | null | 10.1103/PhysRevA.78.022331 | null | quant-ph | null | A two-sphere ("Bloch" or "Poincare") is familiar for describing the dynamics
of a spin-1/2 particle or light polarization. Analogous objects are derived for
unitary groups larger than SU(2) through an iterative procedure that constructs
evolution operators for higher-dimensional SU in terms of lower-dimensional
ones. We focus, in particular, on the SU(4) of two qubits which describes all
possible logic gates in quantum computation. For a general Hamiltonian of SU(4)
with 15 parameters, and for Hamiltonians of its various sub-groups so that
fewer parameters suffice, we derive Bloch-like rotation of unit vectors
analogous to the one familiar for a single spin in a magnetic field. The
unitary evolution of a quantal spin pair is thereby expressed as rotations of
real vectors. Correspondingly, the manifolds involved are Bloch two-spheres
along with higher dimensional manifolds such as a four-sphere for the SO(5)
sub-group and an eight-dimensional Grassmannian manifold for the general SU(4).
This latter may also be viewed as two, mutually orthogonal, real
six-dimensional unit vectors moving on a five-sphere with an additional phase
constraint.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:30:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Uskov",
"D.",
""
],
[
"Rau",
"A. R. P.",
""
]
] | [
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] |
801.2092 | Sergei Vyshenski | S. V. Vyshenski, P. V. Grigoriev, Yu. Yu. Dubenskaya | Model for synchronizer of marked pairs in fork-join network | 15 pages, 3 figures, in Russian | null | null | null | cs.DM | null | We introduce a model for synchronizer of marked pairs, which is a node for
joining results of parallel processing in two-branch fork-join queueing
network. A distribution for number of jobs in the synchronizer is obtained.
Calculations are performed assuming that: arrivals to the network form a
Poisson process, each branch operates like an M/M/N queueing system. It is
shown that a mean quantity of jobs in the synchronizer is bounded below by the
value, defined by parameters of the network (which contains the synchronizer)
and does not depend upon performance and particular properties of the
synchronizer. A domain of network parameters is found, where the flow of jobs
departing from the synchronizer does not manifest a statistically significant
difference from the Poisson type, despite the correlation between job flows
from both branches of the fork-join network.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:34:18 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Vyshenski",
"S. V.",
""
],
[
"Grigoriev",
"P. V.",
""
],
[
"Dubenskaya",
"Yu. Yu.",
""
]
] | [
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] |
801.2093 | Gennady Lykasov I | Gennady Lykasov and Vadim Bednyakov | Monitoring of charmed and beauty quark distributions in proton at LHC | 7 pages, 1 figure. Talk given at the HADRON STRUCTURE '07
International Conference, Bratislava, Slovakia, September 3-7, 2007 | null | null | null | hep-ph | null | A short review on charmed and beauty hadron production in the lepton deep
inelastic scattering off proton, in proton-proton and proton-antiproton
collisions at high energies is presented. It is shown that the existing
theoretical and experimental information on charmed and beauty quark
distributions in a proton is not satisfactory. A some procedure to study these
distributions at LHC energies is suggested.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:36:33 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Jan 2008 08:06:50 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Lykasov",
"Gennady",
""
],
[
"Bednyakov",
"Vadim",
""
]
] | [
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801.2094 | Tom Brown | T.W. Brown | Permutations and the Loop | 13+7 pages, 9 figures; references added, minor clarification | JHEP 0806:008,2008 | 10.1088/1126-6708/2008/06/008 | QMUL-PH-08-02 | hep-th | null | We consider the one-loop two-point function for multi-trace operators in the
U(2) sector of \cN=4 supersymmetric Yang-Mills at finite N. We derive an
expression for it in terms of U(N) and S_{n+1} group theory data, where n is
the length of the operators. The Clebsch-Gordan operators constructed in
0711.0176, which are diagonal at tree level, only mix at one loop if you can
reach the same (n+1)-box Young diagram by adding a single box to each of the
n-box Young diagrams of their U(N) representations (which organise their
multi-trace structure). Similar results are expected for higher loops and for
other sectors of the global symmetry group.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:38:16 GMT"
},
{
"version": "v2",
"created": "Wed, 7 May 2008 18:14:19 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Brown",
"T. W.",
""
]
] | [
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] |
801.2095 | Francois-Xavier Vialard | Fran\c{c}ois-Xavier Vialard (CMLA) | Hamiltonian approach to geodesic image matching | null | null | null | null | math.OC | null | This paper presents a generalization to image matching of the Hamiltonian
approach for planar curve matching developed in the context of group of
diffeomorphisms. We propose an efficient framework to deal with discontinuous
images in any dimension, for example 2D or 3D. In this context, we give the
structure of the initial momentum (which happens to be decomposed in a smooth
part and a singular part) thanks to a derivation lemma interesting in itself.
The second part develops a Hamiltonian interpretation of the variational
problem, derived from the optimal control theory point of view.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:40:05 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Vialard",
"François-Xavier",
"",
"CMLA"
]
] | [
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] |
801.2096 | Henri Gouin | Henri Gouin (MSNMGP, LMMT), Tommaso Ruggeri | Mixture of Fluids involving Entropy Gradients and Acceleration Waves in
Interfacial Layers | 30 pages | European Journal of Mechanics B/ Fluids 24, 5 (2005) 596-613 | 10.1016/j.euromechflu.2005.01.001 | null | physics.flu-dyn | null | Through an Hamiltonian action we write down the system of equations of
motions for a mixture of thermocapillary fluids under the assumption that the
internal energy is a function not only of the gradient of the densities but
also of the gradient of the entropies of each component. A Lagrangian
associated with the kinetic energy and the internal energy allows to obtain the
equations of momentum for each component and for the barycentric motion of the
mixture. We obtain also the balance of energy and we prove that the equations
are compatible with the second law of thermodynamics. Though the system is of
parabolic type, we prove that there exist two tangential acceleration waves
that characterize the interfacial motion. The dependence of the internal energy
of the entropy gradients is mandatory for the existence of this kind of waves.
The differential system is non-linear but the waves propagate without
distortion due to the fact that they are linearly degenerate (exceptional
waves).
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:41:10 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Gouin",
"Henri",
"",
"MSNMGP, LMMT"
],
[
"Ruggeri",
"Tommaso",
""
]
] | [
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] |
801.2097 | Arnold W. Miller | Arnold W. Miller | The Recursion Theorem and Infinite Sequences | null | null | null | null | math.LO | null | In this paper we use the Recursion Theorem to show the existence of various
infinite sequences and sets. Our main result is that there is an increasing
sequence e_0, e_1, e_2 .. such that W_{e_n}={e_{n+1}} for every n. Similarly,
we prove that there exists an increasing sequence such that
W_{e_n}={e_{n+1},e_{n+2},...} for every n. We call a nonempty computably
enumerable set A self-constructing if W_e=A for every e in A. We show that
every nonempty computable enumerable set which is disjoint from an infinite
computable set is one-one equivalent to a self-constructing set
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:42:17 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Miller",
"Arnold W.",
""
]
] | [
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] |
801.2098 | Henri Gouin | Henri Gouin (MSNMGP, LMMT) | The d'Alembert-lagrange principle for gradient theories and boundary
conditions | 17 pages | Asymptotic Methods in Nonlinear Wave Phenomena, World Scientific
(Ed.) (2007) 79-95 | null | null | physics.flu-dyn math.AP | null | Motions of continuous media presenting singularities are associated with
phenomena involving shocks, interfaces or material surfaces. The equations
representing evolutions of these media are irregular through geometrical
manifolds. A unique continuous medium is conceptually simpler than several
media with surfaces of singularity. To avoid the surfaces of discontinuity in
the theory, we transform the model by considering a continuous medium taking
intoaccount more complete internal energies expressed in gradient developments
associated with the variables of state. Nevertheless, resulting equations of
motion are of an higher order than those of the classical models: they lead to
non-linear models associated with more complex integration processes on the
mathematical level as well as on the numerical point of view. In fact, such
models allow a precise study of singular zones when they have a non negligible
physical thickness. This is typically the case for capillarity phenomena in
fluids or mixtures of fluids in which interfacial zones are transition layers
between phases or layers between fluids and solid walls. Within the framework
of mechanics for continuous media, we propose to deal with the functional point
of view considering globally the equations of the media as well as the boundary
conditions associated with these equations. For this aim, we revisit the
d'Alembert-Lagrange principle of virtual works which is able to consider the
expressions of the works of forces applied to a continuous medium as a linear
functional value on a space of test functions in the form of virtual
displacements. At the end, we analyze examples corresponding to capillary
fluids. This analysis brings us to numerical or asymptotic methods avoiding the
difficulties due to singularities in simpler -but with singularities- models.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:43:45 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Gouin",
"Henri",
"",
"MSNMGP, LMMT"
]
] | [
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] |
801.2099 | Loriano Bonora | L.Bonora, R.J.Scherer Santos, D.D.Tolla | Spectral properties of ghost Neumann matrices | 29 pages | Phys.Rev.D77:106001,2008 | 10.1103/PhysRevD.77.106001 | SISSA/101/2007/EP | hep-th | null | We continue the analysis of the ghost wedge states in the oscillator
formalism by studying the spectral properties of the ghost matrices of Neumann
coefficients. We show that the traditional spectral representation is not valid
for these matrices and propose a new heuristic formula that allows one to
reconstruct them from the knowledge of their eigenvalues and eigenvectors. It
turns out that additional data, which we call boundary data, are needed in
order to actually implement the reconstruction. In particular our result lends
support to the conjecture that there exists a ghost three strings vertex with
properties parallel to those of the matter three strings vertex.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:44:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bonora",
"L.",
""
],
[
"Santos",
"R. J. Scherer",
""
],
[
"Tolla",
"D. D.",
""
]
] | [
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] |
801.21 | Cathie Clarke | I. Tilling, C. J. Clarke, J. E. Pringle and C. A. Tout | Disc evolution and the relationship between $L_{\rm acc}$ and $L_\ast$
in T Tauri stars | To appear in MNRAS | null | 10.1111/j.1365-2966.2008.12940.x | null | astro-ph | null | We investigate the evolution of accretion luminosity $L_{\rm acc}$ and
stellar luminosity ${L_\ast}$ in pre-mainsequence stars. We make the assumption
that when the star appears as a Class II object, the major phase of accretion
is long past, and the accretion disc has entered its asymptotic phase. We use
an approximate stellar evolution scheme for accreting pre-mainsequence stars
based on Hartmann, Cassen & Kenyon, 1997. We show that the observed range of
values $k = L_{\rm acc}/L_\ast$ between 0.01 and 1 can be reproduced if the
values of the disc mass fraction $M_{\rm disc}/M_*$ at the start of the T Tauri
phase lie in the range 0.01 -- 0.2, independent of stellar mass. We also show
that the observed upper bound of $L_{\rm acc} \sim L_\ast$ is a generic feature
of such disc accretion. We conclude that as long as the data uniformly fills
the region between this upper bound and observational detection thresholds,
then the degeneracies between age, mass and accretion history severely limit
the use of this data for constraining possible scalings between disc properties
and stellar mass.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:47:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tilling",
"I.",
""
],
[
"Clarke",
"C. J.",
""
],
[
"Pringle",
"J. E.",
""
],
[
"Tout",
"C. A.",
""
]
] | [
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] |
801.2101 | Eytan Katzav | F. Corson, M. Adda-Bedia, H. Henry and E. Katzav | Thermal fracture as a framework for quasi-static crack propagation | 19 pages, 8 figures | International Journal of Fracture, vol 158, pp.1-14, 2009 | 10.1007/s10704-009-9361-4 | null | cond-mat.mtrl-sci cond-mat.other nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address analytically and numerically the problem of crack path prediction
in the model system of a crack propagating under thermal loading. We show that
one can explain the instability from a straight to a wavy crack propagation by
using only the principle of local symmetry and the Griffith criterion. We then
argue that the calculations of the stress intensity factors can be combined
with the standard crack propagation criteria to obtain the evolution equation
for the crack tip within any loading configuration. The theoretical results of
the thermal crack problem agree with the numerical simulations we performed
using a phase field model. Moreover, it turns out that the phase-field model
allows to clarify the nature of the transition between straight and oscillatory
cracks which is shown to be supercritical.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:52:56 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Sep 2009 12:50:59 GMT"
}
] | 2009-09-01T00:00:00 | [
[
"Corson",
"F.",
""
],
[
"Adda-Bedia",
"M.",
""
],
[
"Henry",
"H.",
""
],
[
"Katzav",
"E.",
""
]
] | [
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801.2102 | Osamu Seto | John McDonald and Osamu Seto | Supersymmetric inflation and baryogenesis via Extra-Flat directions of
the MSSM | 20 pages, final version | JCAP0807:015,2008 | 10.1088/1475-7516/2008/07/015 | IFT-UAM/CSIC-08-04 | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One interpretation of proton stability is the existence of extra-flat
directions of the MSSM, in particular $u^{c}u^{c}d^{c}e^{c}$ and $QQQL$, where
the operators lifting the potential are suppressed by a mass scale $\Lambda$
which is much larger than the Planck mass, $ \Lambda \gae 10^{26} \GeV$. Using
D-term hybrid inflation as an example, we show that such flat directions can
serve as the inflaton in SUSY inflation models. The resulting model is a
minimal version of D-term inflation which requires the smallest number of
additional fields. In the case where $Q$-balls form from the extra-flat
direction condensate after inflation, successful Affleck-Dine baryogenesis is
possible if the suppression mass scale is $\gae 10^{31}-10^{35} \GeV$. In this
case the reheating temperature from $Q$-ball decay is in the range $3-100
\GeV$, while observable baryon isocurvature perturbations and non-thermal dark
matter are possible. In the case of extra-flat directions with a large $t$
squark component, there no $Q$-ball formation and reheating is via conventional
condensate decay. In this case the reheating temperature is in the range $1-100
\TeV$, naturally evading thermal gravitino overproduction while allowing
sphaleron erasure of any large B-L asymmetry.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 15:57:49 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jul 2008 19:42:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"McDonald",
"John",
""
],
[
"Seto",
"Osamu",
""
]
] | [
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] |
801.2103 | Alexander Schmidt | Alexander Schmidt | On the K(\pi,1)-property for rings of integers in the mixed case | null | null | null | null | math.NT | null | We investigate the Galois group G_S(p) of the maximal p-extension unramified
outside a finite set S of primes of a number field in the (mixed) case, when
there are primes dividing p inside and outside S. We show that the cohomology
of G_S(p) is "often" isomorphic to the etale cohomology of the scheme Spec(O_k
S), in particular, G_S(p) is of cohomological dimension 2 then. We deduce
this from the results in our previous paper "Rings of integers of type
K(\pi,1)" (arXiv:0705.3372), which mainly dealt with the tame case.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:00:54 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Schmidt",
"Alexander",
""
]
] | [
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] |
801.2104 | Mario Gliozzi | M. Gliozzi (1), I.E. Papadakis (2), R.M. Sambruna (3), ((1) GMU, (2)
University of Crete, (3) NASA GSFC) | Long-Term X-Ray monitoring of NGC6251: Evidence for a jet-dominated
radio galaxy | 13 pages, 8 figures, 2 tables, accepted for publication in ApJ | null | 10.1086/529540 | null | astro-ph | null | We present the first X-ray monitoring observations of the X-ray bright FRI
radio galaxy NGC6251 observed with RXTE for 1 year. The primary goal of this
study is to shed light on the origin of the X-rays, by investigating the
spectral variability with model-independent methods coupled with time-resolved
and flux-selected spectroscopy. The main results can be summarized as follows:
1) Throughout the monitoring campaign, NGC6251 was in relatively high-flux
state. 2) The flux persistently changed with fluctuations of the order of ~2 on
time scales of 20-30 days. 3) When the hardness ratio is plotted against the
average count rate, there is evidence for a spectral hardening as the source
brightens; this finding is confirmed by a flux-selected spectral analysis. 4)
The fractional variability appears to be more pronounced in the hard energy
band (5-12 keV) than in the soft one (2.5-5 keV). 5) 2-month averaged and
flux-limited energy spectra are adequately fitted by a power law. A Fe Kalpha
line is never statistically required, although the presence of a strong iron
line cannot be ruled out, due to the high upper limits on the line equivalent
width. The inconsistency of the spectral variability behavior of NGC6251 with
the typical trend observed in Seyfert galaxies and the similarity with blazars
lead support to a jet-dominated scenario during the RXTE monitoring campaign.
However, a possible contribution from a disk-corona system cannot be ruled out.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:08:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gliozzi",
"M.",
""
],
[
"Papadakis",
"I. E.",
""
],
[
"Sambruna",
"R. M.",
""
]
] | [
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] |
801.2105 | Yu-Jun Cui | Pierre Delage (ENPC-Cermes), Trung Tinh Le (ENPC-Cermes), Anh-Minh
Tang (ENPC-Cermes), Yu-Jun Cui (ENPC-Cermes), Xiang-Ling Li (EURIDICE) | Suction effects in deep Boom clay block samples | null | G\'eotechnique 57, 1 (2007) 239-244 | 10.1680/geot.2007.57.10.862 | null | physics.geo-ph | null | Extensive investigations have been and are being carried out on a stiff clay
from an underground research laboratory located at Mol (Belgium) called Boom
clay, in the context of research into deep nuclear waste disposal. Suction
effects in deep Boom clay block samples were investigated through the
characterisation of the water retention and of the swelling properties of the
clay. The data obtained allowed an estimation of the sample initial suction
that was reasonably compatible with the in-situ state of stress at a depth of
223 m. The relationship between suction and stress changes during loading and
unloading sequences were also examined by running oedometer tests with suction
measurements. A rather wide range of the ratio s/sigma 'v (being s the suction
and sigma 'v the effective vertical stress) was obtained (0.61 - 1), different
from that proposed by Bishop et al; (1974). Finally, the effect of suction
release under an isotropic stress close to the estimated sample suction was
investigated. A slight swelling (1.7%) was observed and further compression
provided a satisfactory value of the overconsolidation ratio confirming the
suggestions of taking some precautions before putting a swelling sample in
contact with water as suggested by Graham et al. (1987). The various
experimental data gathered in this study finally evidenced a relatively good
state of conservation of the block sample used.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:15:02 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Delage",
"Pierre",
"",
"ENPC-Cermes"
],
[
"Le",
"Trung Tinh",
"",
"ENPC-Cermes"
],
[
"Tang",
"Anh-Minh",
"",
"ENPC-Cermes"
],
[
"Cui",
"Yu-Jun",
"",
"ENPC-Cermes"
],
[
"Li",
"Xiang-Ling",
"",
"EURIDICE"
]
] | [
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] |
801.2106 | Jose Villa Morales | F. Cortes, J.A. Le\'on, J. Villa | The Local Time of the Classical Risk Process | 15 pages | null | null | null | math.PR | null | In this paper we give an explicit expression for the local time of the
classical risk process and associate it with the density of an occupational
measure. To do so, we approximate the local time by a suitable sequence of
absolutely continuous random fields. Also, as an application, we analyze the
mean of the times $s \in [0,T]$ such that $0\leq X_{s} \leq X_{s+\epsilon} $
for some given $\epsilon>0$.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:16:23 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Cortes",
"F.",
""
],
[
"León",
"J. A.",
""
],
[
"Villa",
"J.",
""
]
] | [
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] |
801.2107 | Dario Alf\`e | M. Pozzo and D. Alf\`e (1), A. Amieiro, S. French and A. Pratt (2)
((1) University College London) ((2) Johnson Matthey Plc.) | Hydrogen Dissociation and Diffusion on Ni and Ti -doped Mg(0001)
Surfaces | 17 pages, 15 figures, to appear in Journal of Chemical Physics | null | 10.1063/1.2835541 | null | cond-mat.mtrl-sci | null | It is well known, both theoretically and experimentally, that alloying
MgH$_2$ with transition elements can significantly improve the thermodynamic
and kinetic properties for H$_2$ desorption, as well as the H$_2$ intake by Mg
bulk. Here we present a density functional theory investigation of hydrogen
dissociation and surface diffusion over Ni-doped surface, and compare the
findings to previously investigated Ti-doped Mg(0001) and pure Mg(0001)
surfaces. Our results show that the energy barrier for hydrogen dissociation on
the pure Mg(0001) surface is high, while it is small/null when Ni/Ti are added
to the surface as dopants. We find that the binding energy of the two H atoms
near the dissociation site is high on Ti, effectively impeding diffusion away
from the Ti site. By contrast, we find that on Ni the energy barrier for
diffusion is much reduced. Therefore, although both Ti and Ni promote H$_2$
dissociation, only Ni appears to be a good catalyst for Mg hydrogenation,
allowing diffusion away from the catalytic sites. Experimental results
corroborate these theoretical findings, i.e. faster hydrogenation of the Ni
doped Mg sample as opposed to the reference Mg or Ti doped Mg.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:57:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pozzo",
"M.",
"",
"University College London)"
],
[
"Alfè",
"D.",
"",
"University College London)"
],
[
"Amieiro",
"A.",
"",
"Johnson Matthey Plc"
],
[
"French",
"S.",
"",
"Johnson Matthey Plc"
],
[
"Pratt",
"A.",
"",
"Johnson Matthey Plc"
]
] | [
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] |
801.2108 | Cathie Clarke | M. Britsch, C. J. Clarke and G. Lodato | Eccentricity growth of planetesimals in a self-gravitating
protoplanetary disc | To appear in MNRAS | null | 10.1111/j.1365-2966.2008.12910.x | null | astro-ph | null | We investigate the orbital evolution of planetesimals in a self-gravitating
circumstellar disc in the size regime ($\sim 1-5000$ km) where the
planetesimals behave approximately as test particles in the disc's
non-axisymmetric potential. We find that the particles respond to the
stochastic, regenerative spiral features in the disc by executing large random
excursions (up to a factor of two in radius in $\sim 1000$ years), although
typical random orbital velocities are of order one tenth of the Keplerian
speed. The limited time frame and small number of planetesimals modeled does
not permit us to discern any {\it net} direction of planetesimal migration. Our
chief conclusion is that the high eccentricities ($\sim 0.1$) induced by
interaction with spiral features in the disc is likely to be highly
unfavourable to the collisional growth of planetesimals in this size range
while the disc is in the self-gravitating regi me. Thus {\it if}, as recently
argued by Rice et al 2004, 2006, the production of planetesimals gets under way
when the disc is in the self-gravitating regime (either at smaller planetesimal
size scales, where gas drag is important, or via gravitational fragmentation of
the solid component), then the planetesimals thus produced would not be able to
grow collisionally until the disc ceased to be self-gravitating. It is unclear,
however,given the large amplitude excursions undergone by planetesimals in the
self-gravitating disc, whether they would be retained in the disc throughout
this period, or whether they would instead be lost to the central star.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:19:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Britsch",
"M.",
""
],
[
"Clarke",
"C. J.",
""
],
[
"Lodato",
"G.",
""
]
] | [
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] |
801.2109 | Guillaume Valette | Guillaume Valette | Vanishing homology | null | null | null | null | math.AG | null | In this paper we introduce a new homology theory devoted to the study of
families such as semi-algebraic or subanalytic families and in general to any
family definable in an o-minimal structure (such as Denjoy-Carleman definable
or $ln-exp$ definable sets). The idea is to study the cycles which are
vanishing when we approach a special fiber. This also enables us to derive
local metric invariants for germs of definable sets. We prove that the homology
groups are finitely generated.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:24:07 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Valette",
"Guillaume",
""
]
] | [
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] |
801.211 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Black Hole solutions in Einstein-Maxwell-Yang-Mills-Gauss-Bonnet Theory | 20 pages, 5 figures, to be published in JCAP | J. Cosmol. Astropart. Phys. 12 (2008) 005 | 10.1088/1475-7516/2008/12/005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Maxwell and Yang-Mills (YM) fields together, interacting through
gravity both in Einstein and Gauss-Bonnet (GB) theories. For this purpose we
choose two different sets of Maxwell and metric ansaetze. In our first ansatz,
asymptotically for $r\to 0$ (and $N>4$) the Maxwell field dominants over the YM
field. In the other asymptotic region, $r\to \infty $, however, the YM field
becomes dominant. For N=3 and N=4, where the GB term is absent, we recover the
well-known Ba\U{f1}ados-Teitelboim-Zanelli (BTZ) and Reissner-Nordstr\U{f6}m
(RN) metrics, respectively. The second ansatz corresponds to the case of
constant radius function for $S^{N-2}$ part in the metric. This leads to the
Bertotti-Robinson (BR) type solutions in the underlying theory.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:31:13 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 11:56:53 GMT"
},
{
"version": "v3",
"created": "Thu, 30 Oct 2008 16:42:23 GMT"
},
{
"version": "v4",
"created": "Thu, 13 Nov 2008 15:44:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | [
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] |
801.2111 | Pierre Patie | P. Patie | q-Invariant Functions for Some Generalizations of the Ornstein-Uhlenbeck
Semigroup | To appear in ALEA | null | null | null | math.PR | null | We show that the multiplication operator associated to a fractional power of
a Gamma random variable, with parameter q>0, maps the convex cone of the
1-invariant functions for a self-similar semigroup into the convex cone of the
q-invariant functions for the associated Ornstein-Uhlenbeck (for short OU)
semigroup. We also describe the harmonic functions for some other
generalizations of the OU semigroup. Among the various applications, we
characterize, through their Laplace transforms, the laws of first passage times
above and overshoot for certain two-sided stable OU processes and also for
spectrally negative semi-stable OU processes. These Laplace transforms are
expressed in terms of a new family of power series which includes the
generalized Mittag-Leffler functions.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:32:32 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Patie",
"P.",
""
]
] | [
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] |
801.2112 | Oliver Johnson | Fraser Daly and Oliver Johnson | Bounds on the Poincare constant under negative dependence | null | Statistics and Probabiliy Letters, vol 83, 2013, pages 511-518 | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give bounds on the Poincare (inverse spectral gap) constant of a
non-negative, integer-valued random variable W, under negative dependence
assumptions such as ultra log-concavity and total negative dependence. We show
that the bounds obtained compare well to others in the literature. Examples
treated include some occupancy and urn models, a random graph model and small
spacings on the circumference of a circle. Applications to Poisson convergence
theorems are considered.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:36:01 GMT"
},
{
"version": "v2",
"created": "Mon, 5 Nov 2012 09:08:33 GMT"
}
] | 2013-03-20T00:00:00 | [
[
"Daly",
"Fraser",
""
],
[
"Johnson",
"Oliver",
""
]
] | [
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] |
801.2113 | Boselli Alessandro | A. Boselli, S. Boissier, L. Cortese, G. Gavazzi | The origin of dwarf ellipticals in the Virgo cluster | Accepted for publication on ApJ | null | 10.1086/525513 | null | astro-ph | null | We study the evolution of dwarf (L_H < 10^{9.6} L_Ho) star forming and
quiescent galaxies in the Virgo cluster by comparing their UV to radio
centimetric properties to the predictions of multizone chemo-spectrophotometric
models of galaxy evolution especially tuned to take into account the
perturbations induced by the interaction with the cluster intergalactic medium.
Our models simulate one or multiple ram pressure stripping events and galaxy
starvation. Models predict that all star forming dwarf galaxies entering the
cluster for the first time loose most, if not all, of their atomic gas content,
quenching on short time scales (< 150 Myr) their activity of star formation.
These dwarf galaxies soon become red and quiescent, gas metal-rich objects with
spectrophotometric and structural properties similar to those of dwarf
ellipticals. Young, low luminosity, high surface brightness star forming
galaxies such as late-type spirals and BCDs are probably the progenitors of
relatively massive dwarf ellipticals, while it is likely that low surface
brightness magellanic irregulars evolve into very low surface brightness
quiescent objects hardly detectable in ground based imaging surveys. The small
number of dwarf galaxies with physical properties intermediate between those of
star forming and quiescent systems is consistent with a rapid (< 1 Gyr)
transitional phase between the two dwarf galaxies populations. These results,
combined with statistical considerations, are consistent with the idea that
most of the dwarf ellipticals dominating the faint end of the Virgo luminosity
function were initially star forming systems, accreted by the cluster and
stripped of their gas by one or subsequent ram pressure stripping events.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:00:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Boselli",
"A.",
""
],
[
"Boissier",
"S.",
""
],
[
"Cortese",
"L.",
""
],
[
"Gavazzi",
"G.",
""
]
] | [
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801.2114 | Nikita Semenov | Philippe Gille, Nikita Semenov | Zero cycles on projective varieties and the norm principle | 10 pages | Compositio Math. 146 (2010) 457-464 | 10.1112/S0010437X09004394 | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Gille-Merkurjev norm principle we compute in a uniform way the
image of the degree map for quadrics (Springer's theorem), for twisted forms of
maximal orthogonal Grassmannians (theorem of Bayer-Fluckiger and Lenstra), for
E6- (Rost's theorem), and E7-varieties.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:41:04 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Sep 2008 12:23:20 GMT"
}
] | 2019-02-20T00:00:00 | [
[
"Gille",
"Philippe",
""
],
[
"Semenov",
"Nikita",
""
]
] | [
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] |
801.2115 | Sunder Sethuraman | Fred W. Huffer, Jayaram Sethuraman, Sunder Sethuraman | A study of counts of Bernoulli strings via conditional Poisson processes | 10 pages | null | null | null | math.PR | null | We say that a string of length $d$ occurs, in a Bernoulli sequence, if a
success is followed by exactly $(d-1)$ failures before the next success. The
counts of such $d$-strings are of interest, and in specific independent
Bernoulli sequences are known to correspond to asymptotic $d$-cycle counts in
random permutations.
In this note, we give a new framework, in terms of conditional Poisson
processes, which allows for a quick characterization of the joint distribution
of the counts of all $d$-strings, in a general class of Bernoulli sequences, as
certain mixtures of the product of Poisson measures. This general class
includes all Bernoulli sequences considered before, as well many new sequences.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:45:22 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Huffer",
"Fred W.",
""
],
[
"Sethuraman",
"Jayaram",
""
],
[
"Sethuraman",
"Sunder",
""
]
] | [
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801.2116 | Stephen C. Davis | Stephen C. Davis and M. Postma | Successfully combining SUGRA hybrid inflation and moduli stabilisation | 22 pages, 2 figures. v3: refs. added | JCAP 0804:022,2008 | 10.1088/1475-7516/2008/04/022 | DESY 08-003 | hep-th astro-ph hep-ph | null | Inflation and moduli stabilisation mechanisms work well independently, and
many string-motivated supergravity models have been proposed for them. However
a complete theory will contain both, and there will be (gravitational)
interactions between the two sectors. These give corrections to the inflaton
potential, which generically ruin inflation. This holds true even for
fine-tuned moduli stabilisation schemes. Following a suggestion by 0712.3460,
we show that a viable combined model can be obtained if it is the Kahler
functions (G= K+\ln |W|^2) of the two sectors that are added, rather than the
superpotentials (as is usually done). Interaction between the two sectors does
still impose some restrictions on the moduli stabilisation mechanism, which are
derived. Significantly, we find that the (post-inflation) moduli stabilisation
scale no longer needs to be above the inflationary energy scale.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 16:50:55 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 16:34:24 GMT"
},
{
"version": "v3",
"created": "Tue, 1 Apr 2008 10:08:14 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Davis",
"Stephen C.",
""
],
[
"Postma",
"M.",
""
]
] | [
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801.2117 | Jianmin Tao | Jianmin Tao, Giovanni Vignale, and I. V. Tokatly | Quantum Stress Focusing in Descriptive Chemistry | 5 pages, 2 figures | null | 10.1103/PhysRevLett.100.206405 | null | cond-mat.mtrl-sci | null | We show that several important concepts of descriptive chemistry, such as
atomic shells, bonding electron pairs and lone electron pairs, may be described
in terms of {\it quantum stress focusing}, i.e. the spontaneous formation of
high-pressure regions in an electron gas. This description subsumes previous
mathematical constructions, such as the Laplacian of the density and the
electron localization function, and provides a new tool for visualizing
chemical structure. We also show that the full stress tensor, defined as the
derivative of the energy with respect to a local deformation, can be easily
calculated from density functional theory.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:10:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tao",
"Jianmin",
""
],
[
"Vignale",
"Giovanni",
""
],
[
"Tokatly",
"I. V.",
""
]
] | [
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] |
801.2118 | Susan G. Williams | Daniel S. Silver and Susan G. Williams | Dynamics of Twisted Alexander Invariants | This version contains corrections and improvements in exposition. 38
pages, 4 figures | null | null | null | math.GT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Pontryagin dual of the twisted Alexander module for a d-component link
and GL(N,Z) representation is an algebraic dynamical system with an elementary
description in terms of colorings of a diagram. In the case of a knot, its
associated topological entropy is the logarithmic growth rate of the number of
torsion elements in the twisted first-homology group of r-fold cyclic covers of
the knot complement, as r goes to infinity.
Total twisted representations are introduced, and their properties are
studied. The twisted Alexander polynomial obtained from any nonabelian
parabolic SL(2,C) representation of a 2-bridge knot group is seen to be
nontrivial. The zeros of any twisted Alexander polynomial of a torus knot
corresponding to a parabolic SL(2,C) representation or a finite-image
permutation representation are shown to be roots of unity.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:15:03 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jun 2008 15:13:37 GMT"
},
{
"version": "v3",
"created": "Thu, 30 Apr 2009 17:52:23 GMT"
}
] | 2009-04-30T00:00:00 | [
[
"Silver",
"Daniel S.",
""
],
[
"Williams",
"Susan G.",
""
]
] | [
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] |
801.2119 | Santiago Garcia-Burillo | S. Garcia-Burillo (1), J.Gracia-Carpio (1), A. Usero (1), P. Planesas
(1), A. Fuente (1) and M. Krips (2) ((1) OAN-Spain, (2) CFA-USA) | Molecular line probes of activity in galaxies | 4 pages, 2 figures, contributed paper to Far-Infrared Workshop 07
(FIR 2007) | null | 10.1051/eas:0831017 | null | astro-ph | null | The use of specific tracers of the dense molecular gas phase can help to
explore the feedback of activity on the interstellar medium (ISM) in galaxies.
This information is a key to any quantitative assessment of the efficiency of
the star formation process in galaxies. We present the results of a survey
devoted to probe the feedback of activity through the study of the excitation
and chemistry of the dense molecular gas in a sample of local universe
starbursts and active galactic nuclei (AGNs). Our sample includes also 17
luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs). From the
analysis of the LIRGs/ULIRGs subsample, published in Gracia-Carpio et al.(2007)
we find the first clear observational evidence that the star formation
efficiency of the dense gas, measured by the L_FIR/L_HCN ratio, is
significantly higher in LIRGs and ULIRGs than in normal galaxies. Mounting
evidence of overabundant HCN in active environments would even reinforce the
reported trend, pointing to a significant turn upward in the Kennicutt-Schmidt
law around L_FIR=10^11 L_sun. This result has major implications for the use of
HCN as a tracer of the dense gas in local and high-redshift luminous infrared
galaxies.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:27:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Garcia-Burillo",
"S.",
"",
"OAN-Spain"
],
[
"Gracia-Carpio",
"J.",
"",
"OAN-Spain"
],
[
"Usero",
"A.",
"",
"OAN-Spain"
],
[
"Planesas",
"P.",
"",
"OAN-Spain"
],
[
"Fuente",
"A.",
"",
"OAN-Spain"
],
[
"Krips",
"M.",
"",
"CFA-USA"
]
] | [
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] |
801.212 | Lionel Veltz Dr | L. Veltz, O. Bienaym\'e, K. C. Freeman, J. Binney, J. Bland-Hawthorn,
B. K. Gibson, G. Gilmore, E. K. Grebel, A. Helmi, U. Munari, J. F. Navarro,
Q. A. Parker, G. M. Seabroke, A. Siebert, M. Steinmetz, F. G. Watson, M.
Williams, R. F. G. Wyse and T. Zwitter | Galactic kinematics with RAVE data: I. The distribution of stars towards
the Galactic poles | 15 pages, 13 EPS figures and 1 table | null | 10.1051/0004-6361:20066948 | null | astro-ph | null | We analyze the distribution of G and K type stars towards the Galactic poles
using RAVE and ELODIE radial velocities, 2MASS photometric star counts, and
UCAC2 proper motions. The combination of photometric and 3D kinematic data
allows us to disentangle and describe the vertical distribution of dwarfs,
sub-giants and giants and their kinematics. We identify discontinuities within
the kinematics and magnitude counts that separate the thin disk, thick disk and
a hotter component. The respective scale heights of the thin disk and thick
disk are 225$\pm$10 pc and 1048$\pm$36 pc. We also constrain the luminosity
function and the kinematic distribution function. The existence of a kinematic
gap between the thin and thick disks is incompatible with the thick disk having
formed from the thin disk by a continuous process, such as scattering of stars
by spiral arms or molecular clouds. Other mechanisms of formation of the thick
disk such as `created on the spot' or smoothly `accreted' remain compatible
with our findings.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:27:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Veltz",
"L.",
""
],
[
"Bienaymé",
"O.",
""
],
[
"Freeman",
"K. C.",
""
],
[
"Binney",
"J.",
""
],
[
"Bland-Hawthorn",
"J.",
""
],
[
"Gibson",
"B. K.",
""
],
[
"Gilmore",
"G.",
""
],
[
"Grebel",
"E. K.",
""
],
[
"Helmi",
"A.",
""
],
[
"Munari",
"U.",
""
],
[
"Navarro",
"J. F.",
""
],
[
"Parker",
"Q. A.",
""
],
[
"Seabroke",
"G. M.",
""
],
[
"Siebert",
"A.",
""
],
[
"Steinmetz",
"M.",
""
],
[
"Watson",
"F. G.",
""
],
[
"Williams",
"M.",
""
],
[
"Wyse",
"R. F. G.",
""
],
[
"Zwitter",
"T.",
""
]
] | [
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] |
801.2121 | A. N. Ivanov | A. N. Ivanov, R. Reda, P. Kienle | On the time-modulation of the K-shell electron capture decay of H-like
140Pr58+ ions produced by neutrino-flavour mixing | 8 pages, 3 figures, typos in footnote 5 are corrected | null | null | null | nucl-th astro-ph hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to recent experimental data at GSI, the rate of the number of
daughter ions 140Ce58+, produced by the nuclear K-shell electron capture (EC)
decay of the H-like ion 140Pr58+, is modulated in time with a period T_d =
7.06(8) sec and an amplitude a_(EC) = 0.20(2). We show that this phenomenon can
be explained by neutrino-flavour mixing and derive a value for the difference
of squared masses Delta m^2_(21) = m^2_2 - m^2_1 = 2.22(3)x10^(-4) eV^2.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:29:01 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 16:26:35 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Apr 2008 16:39:28 GMT"
},
{
"version": "v4",
"created": "Thu, 17 Jul 2008 10:41:57 GMT"
},
{
"version": "v5",
"created": "Tue, 4 Nov 2008 10:47:49 GMT"
},
{
"version": "v6",
"created": "Mon, 10 Nov 2008 18:03:05 GMT"
}
] | 2008-11-10T00:00:00 | [
[
"Ivanov",
"A. N.",
""
],
[
"Reda",
"R.",
""
],
[
"Kienle",
"P.",
""
]
] | [
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801.2122 | Mathieu Vick | M.Vick and G.Michaud | The Effects of Mass Loss on the Evolution of Chemical Abundances in Fm
Stars | 6 pages, 3 figures, proceedings in Contributions of the Astronomical
Observatory Skalnat\'e Pleso, CP#AP conference, Vienna 2007 | null | null | null | astro-ph | null | Self-consistent stellar models including all effects of atomic diffusion and
radiative accelerations as well as mass loss are evolved from the pre main
sequence for stars of 1.35-1.5, M$_{\odot}$ at solar metallicity (Z=0.02). A
mass loss rate similar to the solar mass loss rate is sufficient to reproduce
observations of the star $\tau$UMa. We discuss the effect of mass loss on the
iron convection zone that naturally appears beneath the main hydrogen
convection zone of these stars. We also find that the effects of mass loss can
be distinguished from those caused by turbulence, but are nevertheless able to
explain the particularities of the AmFm phenomenon.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:34:13 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Vick",
"M.",
""
],
[
"Michaud",
"G.",
""
]
] | [
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] |
801.2123 | Delfim F. M. Torres | Agnieszka B. Malinowska, Delfim F. M. Torres | Necessary and sufficient conditions for local Pareto optimality on time
scales | 7 pages | Journal of Mathematical Sciences, Vol. 161, No. 6, 2009, 803--810 | 10.1007/s10958-009-9601-1 | null | math.OC math.CA | null | We study a multiobjective variational problem on time scales. For this
problem, necessary and sufficient conditions for weak local Pareto optimality
are given. We also prove a necessary optimality condition for the isoperimetric
problem with multiple constraints on time scales.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 17:56:53 GMT"
}
] | 2009-09-18T00:00:00 | [
[
"Malinowska",
"Agnieszka B.",
""
],
[
"Torres",
"Delfim F. M.",
""
]
] | [
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] |
801.2124 | Brian O'Shea | Brian W. O'Shea, Christopher F. McKee, Alexander Heger, Tom Abel | First Stars III Conference Summary | 11 pages, no figures; Conference summary for First Stars III, which
was held in Santa Fe, NM on July 15-20, 2007. To appear in "Proceedings of
First Stars III," Eds. Brian W. O'Shea, Alexander Heger & Tom Abel | null | 10.1063/1.2940787 | LA-UR-08-0139 | astro-ph | null | The understanding of the formation, life, and death of Population III stars,
as well as the impact that these objects had on later generations of structure
formation, is one of the foremost issues in modern cosmological research and
has been an active area of research during the past several years. We summarize
the results presented at "First Stars III," a conference sponsored by Los
Alamos National Laboratory, the Kavli Institute for Particle Astrophysics and
Cosmology, and the Joint Institute for Nuclear Astrophysics. This conference,
the third in a series, took place in July 2007 at the La Fonda Hotel in Santa
Fe, New Mexico, U.S.A.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:06:31 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"O'Shea",
"Brian W.",
""
],
[
"McKee",
"Christopher F.",
""
],
[
"Heger",
"Alexander",
""
],
[
"Abel",
"Tom",
""
]
] | [
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] |
801.2125 | Leonid Sirota | E. Ostrovsky, L.Sirota | Exponential Bounds in the Law of Iterated Logarithm for Martingales | 12 pages | null | null | null | math.PR | null | In this paper non-asymptotic exponential estimates are derived for tail of
maximum martingale distribution by naturally norming in the spirit of the
classical Law of Iterated Logarithm.
Key words: Martingales, exponential estimations, moment, Banach spaces of
random variables, tail of distribution, conditional expectation.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:01:19 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Ostrovsky",
"E.",
""
],
[
"Sirota",
"L.",
""
]
] | [
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] |
801.2126 | Viktor Shapovalov | Viktor I. Shapovalov | The criteria of order change in open system: the statistical approach | 10 pages | null | null | null | physics.gen-ph physics.class-ph | null | The criteria determining the sign of entropy change in the open system are
formulated. The concepts of entrostat, degree of openness, critical level of
ordering are entered. The opportunity of occurrence of entropy oscillations in
a stationary status is shown. The important role of considered of entropy laws
in formation of the global tendencies.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:37:42 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Shapovalov",
"Viktor I.",
""
]
] | [
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801.2127 | Pierre Albin | Pierre Albin, Frederic Rochon | A local families index formula for d-bar operators on punctured Riemann
surfaces | 47 pages | Comm. Math. Phys. 289 (2009), no.2, 483-527 | 10.1007/s00220-009-0816-2 | null | math.DG math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using heat kernel methods developed by Vaillant, a local index formula is
obtained for families of d-bar operators on the Teichmuller universal curve of
Riemann surfaces of genus g with n punctures. The formula also holds on the
moduli space M{g,n} in the sense of orbifolds where it can be written in terms
of Mumford-Morita-Miller classes. The degree two part of the formula gives the
curvature of the corresponding determinant line bundle equipped with the
Quillen connection, a result originally obtained by Takhtajan and Zograf.
| [
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] | 2015-05-13T00:00:00 | [
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] |
801.2128 | Stephane Fay | Stephane Fay, Reza Tavakol | Reconstructing the dark energy | This paper has been withdrawn | null | null | null | astro-ph | null | This paper has been withdrawn by the authors due to numerical problems to get
viable results.
| [
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},
{
"version": "v2",
"created": "Mon, 15 Nov 2010 21:28:25 GMT"
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] | 2010-11-17T00:00:00 | [
[
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"Stephane",
""
],
[
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"Reza",
""
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] |
801.2129 | Junfeng Li | Junfeng Li, Jie Xiao | Well-posedness of the Fifth Order Kadomtsev-Petviashvili I Equation in
Anisotropic Sobolev Spaces with Nonnegative Indices | 17pages | null | null | null | math.AP | null | In this paper we establish the local and global well-posedness of the real
valued fifth order Kadomstev-Petviashvili I equation in the anisotropic Sobolev
spaces with nonnegative indices. In particular, our local well-posedness
improves Saut-Tzvetkov's one and our global well-posedness gives an affirmative
answer to Saut-Tzvetkov's $L^2$-data conjecture.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:28:52 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Li",
"Junfeng",
""
],
[
"Xiao",
"Jie",
""
]
] | [
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] |
801.213 | Tarun Grover Mr | Tarun Grover, T. Senthil | Topological spin Hall states, charged skyrmions, and superconductivity
in two dimensions | 4 pages, typos corrected, added a footnote | Phys. Rev. Lett. 100, 156804 (2008) | 10.1103/PhysRevLett.100.156804 | null | cond-mat.mes-hall cond-mat.supr-con | null | We study the properties of two dimensional topological spin hall insulators
which arise through spontaneous breakdown of spin symmetry in systems that are
spin rotation invariant. Such a phase breaks spin rotation but not time
reversal symmetry and has a vector order parameter. Skyrmion configurations in
this vector order parameter are shown to have electric charge that is twice the
electron charge. When the spin Hall order is destroyed by condensation of
skyrmions superconductivity results. This may happen either through doping or
at fixed filling by tuning interactions to close the skyrmion gap. In the
latter case the superconductor- spin Hall insulator quantum phase transition
can be second order even though the two phases break distinct symmetries.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:35:29 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jan 2008 17:31:47 GMT"
}
] | 2011-09-20T00:00:00 | [
[
"Grover",
"Tarun",
""
],
[
"Senthil",
"T.",
""
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801.2131 | Taras Banakh | T.Banakh, B.Bokalo | On scatteredly continuous maps between topological spaces | We have added a (consistent) example of a $G_\delta$-measurable map
which is not piecewise continuous. This answers an old question of
V.Vinokurov | Topology Appl. 157:1 (2010), 108-122 | null | null | math.GT math.GN | null | A map $f:X\to Y$ between topological spaces is defined to be {\em scatteredly
continuous} if for each subspace $A\subset X$ the restriction $f|A$ has a point
of continuity. We show that for a function $f:X\to Y$ from a perfectly
paracompact hereditarily Baire Preiss-Simon space $X$ into a regular space $Y$
the scattered continuity of $f$ is equivalent to (i) the weak discontinuity
(for each subset $A\subset X$ the set $D(f|A)$ of discontinuity points of $f|A$
is nowhere dense in $A$), (ii) the $\sigma$-continuity ($X$ can be written as a
countable union of closed subsets on which $f$ is continuous), (iii) the
$G_\delta$-measurability (the preimage of each open set is of type $G_\delta$).
Also under Martin Axiom, we construct a $G_\delta$-measurable map $f:X\to Y$
between metrizable separable spaces, which is not piecewise continuous. This
answers an old question of V.Vinokurov.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:48:55 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Jan 2008 13:16:08 GMT"
},
{
"version": "v3",
"created": "Fri, 21 Mar 2008 10:31:40 GMT"
}
] | 2011-10-11T00:00:00 | [
[
"Banakh",
"T.",
""
],
[
"Bokalo",
"B.",
""
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] |
801.2132 | Taras Banakh | Taras Banakh, Ihor Zarichnyy | The coarse classification of homogeneous ultra-metric spaces | null | null | null | null | math.GT math.GN | null | We prove that two homogeneous ultra-metric spaces $X,Y$ are coarsely
equivalent if and only if $\mathrm{Ent}^\sharp(X)=\mathrm{Ent}^\sharp(Y)$ where
$\mathrm{Ent}^\sharp(X)$ is the so-called sharp entropy of $X$. This
classification implies that each homogeneous proper ultra-metric space is
coarsely equivalent to the anti-Cantor set $2^{<\omega}$. For the proof of
these results we develop a technique of towers which can have an independent
interest.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:52:22 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Banakh",
"Taras",
""
],
[
"Zarichnyy",
"Ihor",
""
]
] | [
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] |
801.2133 | Philip Chang | P. Chang | Gas Shepherding by an Infalling Satellite | 12 pages, 6 figures, accepted to ApJ. Substantial revisions following
referee comments. Corrected factor of 2 | null | 10.1086/590326 | null | astro-ph | null | I calculate the action of a satellite, infalling through dynamical friction,
on a coplanar gaseous disk of finite radial extent. The disk tides, raised by
the infalling satellite, couple the satellite and disk. Dynamical friction
acting on the satellite then shrinks the radius of the coupled satellite-disk
system. Thus, the gas is ``shepherded'' to smaller radii. In addition, gas
shepherding produces a large surface density enhancement at the disk edge. If
the disk edge then becomes gravitationally unstable and fragments, it may give
rise to enhanced star formation. On the other hand, if the satellite is
sufficiently massive and dense, the gas may be transported from $\sim 100$ pc
to inside of a 10 to 10s of parsecs before completely fragmenting into stars. I
argue that gas shepherding may drive the fueling of active galaxies and central
starbursts and I compare this scenario to competing scenarios. I argue that
sufficiently large and dense super star clusters (acting as the shepherding
satellites) can shepherd a gas disk down to ten to tens of parsecs. Inside of
ten to tens of parsecs, another mechanism may operate, i.e., cloud-cloud
collisions or a marginally (gravitationally) stable disk, that drives the gas
$\lesssim 1$ pc, where it can be viscously accreted, feeding a central engine.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:55:51 GMT"
},
{
"version": "v2",
"created": "Thu, 22 May 2008 19:30:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chang",
"P.",
""
]
] | [
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801.2134 | Bahram Mashhoon | Bahram Mashhoon | Spin-Gravity Coupling | 10 pages, invited paper presented at the Mathisson Conference (17-20
October 2007, Warsaw, Poland), to appear in Acta Phys. Pol. B | Acta Phys.Polon.Supp.1:113-122,2008 | null | null | gr-qc astro-ph hep-th | null | Mathisson's spin-gravity coupling and its Larmor-equivalent interaction,
namely, the spin-rotation coupling are discussed. The study of the latter leads
to a critical examination of the basic role of locality in relativistic
physics. The nonlocal theory of accelerated systems is outlined and some of its
implications are described.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 18:59:33 GMT"
}
] | 2009-02-10T00:00:00 | [
[
"Mashhoon",
"Bahram",
""
]
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] |
801.2135 | Siu Tat Chui | S. T. Chui, Y. Zhang, Lei Xzhou | Miniaturization and control of split ring structures from an analytic
solution of their resonance | null | null | 10.1063/1.2959834 | null | cond-mat.mtrl-sci cond-mat.other | null | We derived simple polynomial equations to determine the entire resonance
spectra of split ring structures. For double stacking split rings made with
flat wires, we showed that the resonance frequency depends linearly on the
ring-ring separation. In particular, we found that the wavelength of the lowest
resonance mode can be made as large as the geometrical size of the ring for
realistic experimental conditions, whereas for current systems this ratio is of
the order of 10. Finite-difference-time-domain simulations on realistic
structures verified the analytic predictions.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 19:01:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chui",
"S. T.",
""
],
[
"Zhang",
"Y.",
""
],
[
"Xzhou",
"Lei",
""
]
] | [
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] |
801.2136 | Matt Clark | M.T. Clark and M.R. Paul | The Stochastic Dynamics of Rectangular and V-shaped Atomic Force
Microscope Cantilevers in a Viscous Fluid and Near a Solid Boundary | 10 pages, 15 images, corrected equation (8) | null | 10.1063/1.2912989 | null | cond-mat.mes-hall physics.flu-dyn | null | Using a thermodynamic approach based upon the fluctuation-dissipation theorem
we quantify the stochastic dynamics of rectangular and V-shaped microscale
cantilevers immersed in a viscous fluid. We show that the stochastic cantilever
dynamics as measured by the displacement of the cantilever tip or by the angle
of the cantilever tip are different. We trace this difference to contributions
from the higher modes of the cantilever. We find that contributions from the
higher modes are significant in the dynamics of the cantilever tip-angle. For
the V-shaped cantilever the resulting flow field is three-dimensional and
complex in contrast to what is found for a long and slender rectangular
cantilever. Despite this complexity the stochastic dynamics can be predicted
using a two-dimensional model with an appropriately chosen length scale. We
also quantify the increased fluid dissipation that results as a V-shaped
cantilever is brought near a solid planar boundary.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 19:10:33 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Jan 2008 18:48:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Clark",
"M. T.",
""
],
[
"Paul",
"M. R.",
""
]
] | [
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] |
801.2137 | Keji Lai | K. Lai, W. Kundhikanjana, M. Kelly, and Z.X. Shen | Modeling of a Cantilever-Based Near-Field Scanning Microwave Microscope | 7 figures | Rev. Sci. Instrum. 79, 063703 (2008) | 10.1063/1.2949109 | null | cond-mat.other cond-mat.mtrl-sci | null | We present a detailed modeling and characterization of our scalable microwave
nanoprobe, which is a micro-fabricated cantilever-based scanning microwave
probe with separated excitation and sensing electrodes. Using finite-element
analysis, the tip-sample interaction is modeled as small impedance changes
between the tip electrode and the ground at our working frequencies near 1GHz.
The equivalent lumped elements of the cantilever can be determined by
transmission line simulation of the matching network, which routes the
cantilever signals to 50 Ohm feed lines. In the microwave electronics, the
background common-mode signal is cancelled before the amplifier stage so that
high sensitivity (below 1 atto-Farad capacitance changes) is obtained.
Experimental characterization of the microwave probes was performed on
ion-implanted Si wafers and patterned semiconductor samples. Pure electrical or
topographical signals can be realized using different reflection modes of the
probe.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 19:22:10 GMT"
}
] | 2008-09-24T00:00:00 | [
[
"Lai",
"K.",
""
],
[
"Kundhikanjana",
"W.",
""
],
[
"Kelly",
"M.",
""
],
[
"Shen",
"Z. X.",
""
]
] | [
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] |
801.2138 | Ookie Ma | Ookie Ma and J. B. Marston | Weak Ferromagnetic Exchange and Anomalous Specific Heat in ZnCu3(OH)6Cl2 | 4 pages, 3 figures, some clarifications to the text | Phys. Rev. Lett. 101, 027204 (2008) | 10.1103/PhysRevLett.101.027204 | null | cond-mat.str-el | null | Experimental evidence for a plethora of low energy spin excitations in the
spin-1/2 kagome antiferromagnet ZnCu3(OH)6Cl2 may be understandable in terms of
an extended Fermi surface of spinons coupled to a U(1) gauge field. We carry
out variational calculations to examine the possibility that such a state may
be energetically viable. A Gutzwiller-projected wavefunction reproduces the
dimerization of a kagome strip found previously by DMRG. Application to the
full kagome lattice shows that the inclusion of a small ferromagnetic
next-nearest-neighbor interaction favors a ground state with a spinon Fermi
surface.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 19:57:22 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 19:07:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ma",
"Ookie",
""
],
[
"Marston",
"J. B.",
""
]
] | [
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] |
801.2139 | I. S. Burmistrov | I.S. Burmistrov and N.M. Chtchelkatchev | Spin-valley interplay in two-dimensional disordered electron liquid | LaTex, 13 pages, 8 figures | Phys. Rev. B 77 (19), 195319 (2008) | 10.1103/PhysRevB.77.195319 | null | cond-mat.mes-hall cond-mat.str-el | null | We report the detailed study of the influence of the spin and valley
splittings on such physical observables of the two-dimensional disordered
electron liquid as resistivity, spin and valley susceptibilities. We explain
qualitatively the nonmonotonic dependence of the resistivity with temperature
in the presence of a parallel magnetic field. In the presence of either the
spin splitting or the valley splitting we predict novel, with two maximum
points, temperature dependence of the resistivity.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 19:47:05 GMT"
}
] | 2008-05-17T00:00:00 | [
[
"Burmistrov",
"I. S.",
""
],
[
"Chtchelkatchev",
"N. M.",
""
]
] | [
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] |
801.214 | Luis Lehner | Mariana Cecere, Luis Lehner, Oscar Reula | Constraint preserving boundary conditions for the Ideal Newtonian MHD
equations | uses elsart style | Comput.Phys.Commun.179:545-554,2008 | 10.1016/j.cpc.2008.04.015 | null | astro-ph gr-qc physics.comp-ph | null | We study and develop constraint preserving boundary conditions for the
Newtonian magnetohydrodynamic equations and analyze the behavior of the
numerical solution upon considering different possible options.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 19:48:42 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Cecere",
"Mariana",
""
],
[
"Lehner",
"Luis",
""
],
[
"Reula",
"Oscar",
""
]
] | [
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] |
801.2141 | David Neufeld | David Neufeld and Yuan Yuan (JHU) | Mapping warm molecular hydrogen with Spitzer's Infrared Array Camera
(IRAC) | 27 pages, including 11 figures. Accepted for publication in ApJ | null | 10.1086/529512 | null | astro-ph | null | Photometric maps, obtained with Spitzer's Infrared Array Camera (IRAC), can
provide a valuable probe of warm molecular hydrogen within the interstellar
medium. IRAC maps of the supernova remnant IC443, extracted from the Spitzer
archive, are strikingly similar to spectral line maps of the H2 pure rotational
transitions that we obtained with the Infrared Spectrograph (IRS) instrument on
Spitzer. IRS spectroscopy indicates that IRAC Bands 3 and 4 are indeed
dominated by the H2 v=0-0 S(5) and S(7) transitions, respectively. Modeling of
the H2 excitation suggests that Bands 1 and 2 are dominated by H2 v=1-0 O(5)
and v=0-0 S(9). Large maps of the H2 emission in IC433, obtained with IRAC,
show band ratios that are inconsistent with the presence of gas at a single
temperature. The relative strengths of IRAC Bands 2, 3, and 4 are consistent
with pure H2 emission from shocked material with a power-law distribution of
gas temperatures. CO vibrational emissions do not contribute significantly to
the observed Band 2 intensity. Assuming that the column density of H2 at
temperatures T to T+dT is proportional to T raised to the power -b for
temperatures up to 4000 K, we obtained a typical estimate of 4.5 for b. The
power-law index, b, shows variations over the range 3 to 6 within the set of
different sight-lines probed by the maps, with the majority of sight-lines
showing b in the range 4 to 5. The observed power-law index is consistent with
the predictions of simple models for paraboloidal bow shocks.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 19:49:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Neufeld",
"David",
"",
"JHU"
],
[
"Yuan",
"Yuan",
"",
"JHU"
]
] | [
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] |
801.2142 | Alexandre Girouard | Alexandre Girouard, Nikolai Nadirashvili, Iosif Polterovich | Maximization of the second positive Neumann eigenvalue for planar
domains | 24 pages, 2 figures; Conjecture 1.2.3 corrected | J. Differential Geom. 83 (2009), no. 3, 637-661 | null | null | math.SP | null | We prove that the second positive Neumann eigenvalue of a bounded
simply-connected planar domain of a given area does not exceed the first
positive Neumann eigenvalue on a disk of a twice smaller area. This estimate is
sharp and attained by a sequence of domains degenerating to a union of two
identical disks. In particular, this result implies the Polya conjecture for
the second Neumann eigenvalue. The proof is based on a combination of analytic
and topological arguments. As a by-product of our method we obtain an upper
bound on the second eigenvalue for conformally round metrics on odd-dimensional
spheres.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 19:57:18 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 20:07:32 GMT"
}
] | 2012-02-24T00:00:00 | [
[
"Girouard",
"Alexandre",
""
],
[
"Nadirashvili",
"Nikolai",
""
],
[
"Polterovich",
"Iosif",
""
]
] | [
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] |
801.2143 | Sukanta Dutta | Sukanta Dutta and Ashok Goyal | Neutrino, Photon Interaction in Unparticle Physics | 11 pages, 3 figures | Phys.Lett.B664:25-30,2008 | 10.1016/j.physletb.2008.05.018 | null | hep-ph | null | We investigate the impact of unparticle physics on the annihilation of relic
neutrinos with the neutrinos identified as primary source of ultra high energy
(UHE) cosmic ray events, producing a cascade of photons and charged particles.
We compute the contribution of the unparticle exchange to the cross-sections
$\nu \bar\nu\to\gamma \gamma$ and $\nu \bar\nu\to f \bar f$ scattering. We
estimate the neutrino photon decoupling temperature from the reaction rate of
$\nu \bar\nu\to\gamma \gamma$. We find that inclusion of unparticles can in
fact account for the flux of UHE cosmic rays and can also result in the
lowering of neutrino - photon decoupling temperature below the QCD phase
transition for unparticle physics parameters in a certain range. We calculate
the mean free path of these high energy neutrinos annihilating themselves with
the relic neutrinos to produce vector and tensor unparticles.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:11:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dutta",
"Sukanta",
""
],
[
"Goyal",
"Ashok",
""
]
] | [
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801.2144 | Markus Grassl | Markus Grassl and Martin Roetteler | Non-Additive Quantum Codes from Goethals and Preparata Codes | submitted to the 2008 IEEE Information Theory Workshop (ITW 2008) | Proceedings IEEE Information Theory Workshop 2008 (ITW 2008),
Porto, Portugal, May 2008, pp. 396-400 | 10.1109/ITW.2008.4578694 | null | quant-ph cs.IT math.IT | null | We extend the stabilizer formalism to a class of non-additive quantum codes
which are constructed from non-linear classical codes. As an example, we
present infinite families of non-additive codes which are derived from Goethals
and Preparata codes.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:12:14 GMT"
}
] | 2009-05-24T00:00:00 | [
[
"Grassl",
"Markus",
""
],
[
"Roetteler",
"Martin",
""
]
] | [
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801.2145 | Octavian Mustafa | Octavian G. Mustafa | On the oscillatory integration of some ordinary differential equations | 16 pages, 1 figure | null | null | null | math.CA math.DS | null | Conditions are given for a class of nonlinear ordinary differential equations
x''(t)+a(t)w(x)=0, t>=1, which includes the linear equation to possess
solutions x(t) with prescribed oblique asymptote that have an oscillatory
pseudo-wronskian x'(t)-x(t)/t.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:12:29 GMT"
}
] | 2008-01-15T00:00:00 | [
[
"Mustafa",
"Octavian G.",
""
]
] | [
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801.2146 | Jesus Gomez-Gardenes | Salvo Assenza, Jesus Gomez-Gardenes and Vito Latora | Enhancement of cooperation in highly clustered scale-free networks | 4 pages, 3 figures | Physical Review E 78, 017101 (2008) | 10.1103/PhysRevE.78.017101 | null | physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of clustering on the organization of cooperation, by
analyzing the evolutionary dynamics of the Prisoner's Dilemma on scale-free
networks with a tunable value of clustering. We find that a high value of the
clustering coefficient produces an overall enhancement of cooperation in the
network, even for a very high temptation to defect. On the other hand, high
clustering homogeneizes the process of invasion of degree classes by defectors,
decreasing the chances of survival of low densities of cooperator strategists
in the network.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:12:31 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Jul 2008 11:51:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Assenza",
"Salvo",
""
],
[
"Gomez-Gardenes",
"Jesus",
""
],
[
"Latora",
"Vito",
""
]
] | [
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] |
801.2147 | Brian Sharpee | Robert Williams (1), Edward B. Jenkins (2), Jack A. Baldwin (3), Yong
Zhang (4), Brian Sharpee (5), Eric Pellegrini (3), Mark Phillips (6) ((1)
Space Telescope Science Institute, (2) Princeton University Observatory, (3)
Department of Physics and Astronomy, Michigan State University, (4)
Department of Physics, University of Hong Kong, (5) Molecular Physics
Laboratory, SRI International, (6) Las Campanas Observatory, Carnegie
Observatories) | Independent Emission and Absorption Abundances for Planetary Nebulae | 19 pages, 13 figures, accepted by ApJ. Preprint utilizes
emulateapj.cls v. 12/01/06 (included) | null | 10.1086/529065 | null | astro-ph | null | Emission-line abundances have been uncertain for more than a decade due to
unexplained discrepancies in the relative intensities of the forbidden lines
and weak permitted recombination lines in planetary nebulae (PNe) and H II
regions. The observed intensities of forbidden and recombination lines
originating from the same parent ion differ from their theoretical values by
factors of more than an order of magnitude in some of these nebulae. In this
study we observe UV resonance line absorption in the central stars of PNe
produced by the nebular gas, and from the same ions that emit optical forbidden
lines. We then compare the derived absorption column densities with the
emission measures determined from ground-based observations of the nebular
forbidden lines. We find for our sample of PNe that the collisionally excited
forbidden lines yield column densities that are in basic agreement with the
column densities derived for the same ions from the UV absorption lines. A
similar comparison involving recombination line column densities produces
poorer agreement, although near the limits of the formal uncertainties of the
analyses. An additional sample of objects with larger abundance discrepancy
factors will need to be studied before a stronger statement can be made that
recombination line abundances are not correct.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:31:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Williams",
"Robert",
""
],
[
"Jenkins",
"Edward B.",
""
],
[
"Baldwin",
"Jack A.",
""
],
[
"Zhang",
"Yong",
""
],
[
"Sharpee",
"Brian",
""
],
[
"Pellegrini",
"Eric",
""
],
[
"Phillips",
"Mark",
""
]
] | [
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] |
801.2148 | Vitor Araujo | Vitor Araujo and Mario Bessa | Dominated splitting and zero volume for incompressible three-flows | 23 pages, no figures | Nonlinearity 21 (2008), 1637-1653 | 10.1088/0951-7715/21/7/014 | null | math.DS math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that there exists an open and dense subset of the incompressible
3-flows of class C^2 such that, if a flow in this set has a positive volume
regular invariant subset with dominated splitting for the linear Poincar\'e
flow, then it must be an Anosov flow. With this result we are able to extend
the dichotomies of Bochi-Ma\~n\'e and of Newhouse for flows with singularities.
That is we obtain for a residual subset of the C^1 incompressible flows on
3-manifolds that: (i) either all Lyapunov exponents are zero or the flow is
Anosov, and (ii) either the flow is Anosov or else the elliptic periodic points
are dense in the manifold.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:19:09 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Aug 2008 14:39:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Araujo",
"Vitor",
""
],
[
"Bessa",
"Mario",
""
]
] | [
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] |
801.2149 | Shin Hattori | Shin Hattori (Kyushu University) | On a ramification bound of torsion semi-stable representations over a
local field | 33 pages; totally revised version (the bound improved) | null | null | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a rational prime p, let k be a perfect field of characteristic p, K be a
finite totally ramified extension of Frac(W(k)) of degree e and r be a
non-negative integer satisfying r<p-1. In this article, we prove the upper
numbering ramification group G^(j) for j>u(K,r,n) acts trivially on the
p^n-torsion semi-stable G_K-representations with the Hodge-Tate weights in
{0,...,r}, where u(K,0,n)=0, u(K,1,n)=1+e(n+1/(p-1)) and
u(K,r,n)=1-p^{-n}+e(n+r/(p-1)) for r>1.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:24:28 GMT"
},
{
"version": "v2",
"created": "Sun, 10 Feb 2008 12:13:49 GMT"
},
{
"version": "v3",
"created": "Mon, 16 Jun 2008 11:41:00 GMT"
},
{
"version": "v4",
"created": "Sat, 20 Jun 2009 13:46:33 GMT"
}
] | 2009-06-20T00:00:00 | [
[
"Hattori",
"Shin",
"",
"Kyushu University"
]
] | [
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801.215 | Markus Grassl | Markus Grassl and Martin Roetteler | Quantum Goethals-Preparata Codes | Submitted to the 2008 IEEE International Symposium on Information
Theory | Proceedings 2008 IEEE International Symposium on Information
Theory (ISIT 2008), Toronto, Canada, July 2008, pp. 300-304 | 10.1109/ISIT.2008.4594996 | null | quant-ph cs.IT math.IT | null | We present a family of non-additive quantum codes based on Goethals and
Preparata codes with parameters ((2^m,2^{2^m-5m+1},8)). The dimension of these
codes is eight times higher than the dimension of the best known additive
quantum codes of equal length and minimum distance.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:29:17 GMT"
}
] | 2009-05-24T00:00:00 | [
[
"Grassl",
"Markus",
""
],
[
"Roetteler",
"Martin",
""
]
] | [
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801.2151 | Subodh Patil | Subodh P. Patil | Degravitation, Inflation and the Cosmological Constant as an Afterglow | To appear in JCAP; sections discussing degravitation as a
semi-classical effect and the modified Bianchi identities added | JCAP 0901:017,2009 | 10.1088/1475-7516/2009/01/017 | null | hep-th astro-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this report, we adopt the phenomenological approach of taking the
degravitation paradigm seriously as a consistent modification of gravity in the
IR, and investigate its consequences for various cosmological situations. We
motivate degravitation-- where Netwon's constant is promoted to a scale
dependent filter function-- as arising from either a small (resonant) mass for
the graviton, or as an effect in semi-classical gravity. After addressing how
the Bianchi identities are to be satisfied in such a set up, we turn our
attention towards the cosmological consequences of degravitation. By
considering the example filter function corresponding to a resonantly massive
graviton (with a filter scale larger than the present horizon scale), we show
that slow roll inflation, hybrid inflation and old inflation remain
quantitatively unchanged. We also find that the degravitation mechanism
inherits a memory of past energy densities in the present epoch in such a way
that is likely significant for present cosmological evolution. For example, if
the universe underwent inflation in the past due to it having tunneled out of
some false vacuum, we find that degravitation implies a remnant `afterglow'
cosmological constant, whose scale immediately afterwards is parametrically
suppressed by the filter scale ($L$) in Planck units $\Lambda \sim
l^2_{pl}/L^2$. We discuss circumstances through which this scenario reasonably
yields the presently observed value for $\Lambda \sim O(10^{-120})$. We also
find that in a universe still currently trapped in some false vacuum state,
resonance graviton models of degravitation only degravitate initially Planck or
GUT scale energy densities down to the presently observed value over timescales
comparable to the filter scale.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:51:23 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Aug 2008 20:30:52 GMT"
},
{
"version": "v3",
"created": "Fri, 5 Dec 2008 14:38:29 GMT"
}
] | 2009-02-24T00:00:00 | [
[
"Patil",
"Subodh P.",
""
]
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] |
801.2152 | Rob Reid | R.I. Reid, A.D. Gray, T.L. Landecker, A.G. Willis | Correcting the Polarization Leakage Phases and Amplitudes Throughout the
Primary Beam of an Interferometer | 9 pages; 11 figures, to be published in Radio Science | null | 10.1029/2007RS003709 | null | astro-ph | null | Polarimetric observations are affected by leakage of unpolarized light into
the polarization channels, in a way that varies with the angular position of
the source relative to the optical axis. The off-axis part of the leakage is
often corrected by subtracting from each polarization image the product of the
unpolarized map and a leakage map, but it is seldom realized that
heterogeneities in the array shift the loci of the leaked radiation in a
baseline-dependent fashion. We present here a method to measure and remove the
wide-field polarization leakage of a heterogeneous array. The process also maps
the complex voltage patterns of each antenna, which can be used to correct all
Stokes parameters for imaging errors due to the primary beams.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:56:42 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Reid",
"R. I.",
""
],
[
"Gray",
"A. D.",
""
],
[
"Landecker",
"T. L.",
""
],
[
"Willis",
"A. G.",
""
]
] | [
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] |
801.2153 | Carlos Fuertes | Jose L.F. Barbon and Carlos A. Fuertes | A note on the extensivity of the holographic entanglement entropy | 12 pages and 2 figures; one reference added; Significant additions to
section 3, involving new results and a more pedagogical presentation | JHEP 0805:053,2008 | 10.1088/1126-6708/2008/05/053 | IFTE UAM/CSIC-2007-66 | hep-th cond-mat.str-el | null | We consider situations where the renormalized geometric entropy, as defined
by the AdS/CFT ansatz of Ryu and Takayanagi, shows extensive behavior in the
volume of the entangled region. In general, any holographic geometry that is
`capped' in the infrared region is a candidate for extensivity provided the
growth of minimal surfaces saturates at the capping region, and the induced
metric at the `cap' is non-degenerate. Extensivity is well-known to occur for
highly thermalized states. In this note, we show that the holographic ansatz
predicts the persistence of the extensivity down to vanishing temperature, for
the particular case of conformal field theories in 2+1 dimensions with a
magnetic field and/or electric charge condensates.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 20:59:23 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 15:16:08 GMT"
},
{
"version": "v3",
"created": "Wed, 14 May 2008 20:03:33 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Barbon",
"Jose L. F.",
""
],
[
"Fuertes",
"Carlos A.",
""
]
] | [
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801.2154 | Masaki Shigemori | Joseph Marsano, Kyriakos Papadodimas, and Masaki Shigemori | Off-shell M5 Brane, Perturbed Seiberg-Witten Theory, and Metastable
Vacua | 62 pages (46 pages + 5 appendices), 10 figures | Nucl.Phys.B804:19-69,2008 | 10.1016/j.nuclphysb.2008.05.005 | CALT-68-2668, ITFA-2008-01 | hep-th | null | We demonstrate that, in an appropriate limit, the off-shell M5-brane
worldvolume action effectively captures the scalar potential of Seiberg-Witten
theory perturbed by a small superpotential and, consequently, any
nonsupersymmetric vacua that it describes. This happens in a similar manner to
the emergence from M5's of the scalar potential describing certain type IIB
flux configurations [arXiv:0705.0983]. We then construct exact nonholomorphic
M5 configurations in the special case of SU(2) Seiberg-Witten theory deformed
by a degree six superpotential which correspond to the recently discovered
metastable vacua of Ooguri, Ookouchi, Park [arXiv:0704.3613], and Pastras
[arXiv:0705.0505]. These solutions take the approximate form of a holomorphic
Seiberg-Witten geometry with harmonic embedding along a transverse direction
and allow us to obtain geometric intuition for local stability of the gauge
theory vacua. As usual, dynamical processes in the gauge theory, such as the
decay of nonsupersymmetric vacua, take on a different character in the M5
description which, due to issues of boundary conditions, typically involves
runaway behavior in MQCD.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:02:33 GMT"
}
] | 2010-06-28T00:00:00 | [
[
"Marsano",
"Joseph",
""
],
[
"Papadodimas",
"Kyriakos",
""
],
[
"Shigemori",
"Masaki",
""
]
] | [
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] |
801.2155 | Dennis Stello | D. Stello, H. Bruntt, H. Preston, D. Buzasi | Oscillating K giants with the WIRE satellite: determination of their
asteroseismic masses | 4 pages, 3 figures. Accepted for publication in ApJL | null | 10.1086/528936 | null | astro-ph | null | Mass estimates of K giants are generally very uncertain. Traditionally,
stellar masses of single field stars are determined by comparing their location
in the Hertzsprung-Russell diagram with stellar evolutionary models. Applying
an additional method to determine the mass is therefore of significant interest
for understanding stellar evolution. We present the time series analysis of 11
K giants recently observed with the WIRE satellite. With this comprehensive
sample, we report the first confirmation that the characteristic acoustic
frequency, nu_max, can be predicted for K giants by scaling from the solar
acoustic cut-off frequency. We are further able to utilize our measurements of
nu_max to determine an asteroseismic mass for each star with a lower
uncertainty compared to the traditional method, for most stars in our sample.
This indicates good prospects for the application of our method on the vast
amounts of data that will soon come from the COROT and Kepler space missions.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:23:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stello",
"D.",
""
],
[
"Bruntt",
"H.",
""
],
[
"Preston",
"H.",
""
],
[
"Buzasi",
"D.",
""
]
] | [
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801.2156 | Axel Brandenburg | A. Brandenburg (Nordita), E. A. Spiegel (Columbia Univ) | Modeling a Maunder Minimum | 8 pages, 6 figures, Astron. Nachr. (submitted) | Astron. Nachr. 329, 351-358 (2008) | 10.1002/asna.200810973 | NORDITA-2007-32 | astro-ph | null | We introduce on/off intermittency into a mean field dynamo model by imposing
stochastic fluctuations in either the alpha effect or through the inclusion of
a fluctuating electromotive force. Sufficiently strong small scale fluctuations
with time scales of the order of 0.3-3 years can produce long term variations
in the system on time scales of the order of hundreds of years. However, global
suppression of magnetic activity in both hemispheres at once was not observed.
The variation of the magnetic field does not resemble that of the sunspot
number, but is more reminiscent of the 10 Be record. The interpretation of our
results focuses attention on the connection between the level of magnetic
activity and the sunspot number, an issue that must be elucidated if long term
solar effects are to be well understood.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 14:02:20 GMT"
}
] | 2008-03-27T00:00:00 | [
[
"Brandenburg",
"A.",
"",
"Nordita"
],
[
"Spiegel",
"E. A.",
"",
"Columbia Univ"
]
] | [
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] |
801.2157 | Nathaniel Craig | Nathaniel J. Craig | ISS-flation | 26 pages | JHEP0802:059,2008 | 10.1088/1126-6708/2008/02/059 | null | hep-th astro-ph hep-ph | null | Inflation may occur while rolling into the metastable supersymmetry-breaking
vacuum of massive supersymmetric QCD. We explore the range of parameters in
which slow-roll inflation and long-lived metastable supersymmetry breaking may
be simultaneously realized. The end of slow-roll inflation in this context
coincides with the spontaneous breaking of a global symmetry, which may give
rise to significant curvature perturbations via inhomogenous preheating. Such
spontaneous symmetry breaking at the end of inflation may give rise to
observable non-gaussianities, distinguishing this scenario from more
conventional models of supersymmetric hybrid inflation.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:03:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Craig",
"Nathaniel J.",
""
]
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] |
801.2158 | David Rothstein | David M. Rothstein, Richard V. E. Lovelace (Cornell University) | Advection of Magnetic Fields in Accretion Disks: Not So Difficult After
All | 13 pages, 4 figures; accepted for publication in The Astrophysical
Journal (v2: added references to papers by McKinney et al.) | Astrophys.J.677:1221-1232, 2008 | 10.1086/529128 | null | astro-ph | null | We show that a large-scale, weak magnetic field threading a turbulent
accretion disk tends to be advected inward, contrary to previous suggestions
that it will be stopped by outward diffusion. The efficient inward transport is
a consequence of the diffuse, magnetically-dominated surface layers of the
disk, where the turbulence is suppressed and the conductivity is very high.
This structure arises naturally in three-dimensional simulations of
magnetorotationally unstable disks, and we demonstrate here that it can easily
support inward advection and compression of a weak field. The advected field is
anchored in the surface layer but penetrates the main body of the disk, where
it can generate strong turbulence and produce values of alpha (i.e., the
turbulent stress) large enough to match observational constraints; typical
values of the vertical magnetic field merely need to reach a few percent of
equipartition for this to occur. Overall, these results have important
implications for models of jet formation which require strong, large-scale
magnetic fields to exist over a region of the inner accretion disk.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:34:41 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Jan 2008 22:46:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rothstein",
"David M.",
"",
"Cornell University"
],
[
"Lovelace",
"Richard V. E.",
"",
"Cornell University"
]
] | [
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] |
801.2159 | Jennifer A. Johnson | Jennifer A. Johnson (1), B. Scott Gaudi (1), Takahiro Sumi (2), Ian A.
Bond (3), and Andrew Gould (1) ((1) Ohio State University, (2) Nagoya
University, (3) Massey University) | A High-Resolution Spectrum of the Highly Magnified Bulge G-Dwarf
MOA-2006-BLG-099S | 42 pages, 14 figures, submitted to ApJ | null | 10.1086/589763 | null | astro-ph | null | We analyze a high-resolution spectrum of a microlensed G-dwarf in the
Galactic bulge, acquired when the star was magnified by a factor of 110. We
measure a spectroscopic temperature, derived from the wings of the Balmer
lines, that is the same as the photometric temperature, derived using the color
determined by standard microlensing techniques. We measure [Fe/H]=0.36 +/-0.18,
which places this star at the upper end of the Bulge giant metallicity
distribution. In particular, this star is more metal-rich than any bulge M
giant with high-resolution abundances. We find that the abundance ratios of
alpha and iron-peak elements are similar to those of Bulge giants with the same
metallicity. For the first time, we measure the abundances of K and Zn for a
star in the Bulge. The [K/Mg] ratio is similar to the value measured in the
halo and the disk, suggesting that K production closely tracks alpha
production. The [Cu/Fe] and [Zn/Fe] ratios support the theory that those
elements are produced in Type II SNe, rather than Type Ia SNe. We also measured
the first C and N abundances in the Bulge that have not been affected by first
dredge-up. The [C/Fe] and [N/Fe] ratios are close to solar, in agreement with
the hypothesis that giants experience only canonical mixing.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:05:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Johnson",
"Jennifer A.",
""
],
[
"Gaudi",
"B. Scott",
""
],
[
"Sumi",
"Takahiro",
""
],
[
"Bond",
"Ian A.",
""
],
[
"Gould",
"Andrew",
""
]
] | [
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] |
801.216 | Antonis Georgakakis | A. Georgakakis, K. Nandra, R. Yan, S. P. Willner, J. M. Lotz, C. M.
Pierce, M. C. Cooper, E. S. Laird, D. C. Koo, P. Barmby, J. A. Newman, J. R.
Primack, A. L. Coil | The role of AGN in the colour transformation of galaxies at redshifts
z~1 | Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.12962.x | null | astro-ph | null | We explore the role of AGN in establishing and/or maintaining the bimodal
colour distribution of galaxies by quenching their star-formation and hence,
causing their transition from the blue to the red cloud. Important tests for
this scenario include (i) the X-ray properties of galaxies in the transition
zone between the two clouds and (ii) the incidence of AGN in post-starbursts,
i.e. systems observed shortly after (<1Gyr) the termination of their
star-formation. We perform these tests by combining deep Chandra observations
with multiwavelength data from the AEGIS survey. Stacking the X-ray photons at
the positions of galaxies (0.4<z<0.9) not individually detected at X-ray
wavelengths suggests a population of obscured AGN among sources in the
transition zone and in the red cloud. Their mean X-ray and mid-IR properties
are consistent with moderately obscured low-luminosity AGN, Compton thick
sources or a mix of both. Morphologies show that major mergers are unlikely to
drive the evolution of this population but minor interactions may play a role.
The incidence of obscured AGN in the red cloud (both direct detections and
stacking results) suggests that BH accretion outlives the termination of the
star-formation. This is also supported by our finding that post-starburst
galaxies at z~0.8 and AGN are associated, in agreement with recent results at
low-z. A large fraction of post-starbursts and red cloud galaxies show evidence
for at least moderate levels of AGN obscuration. This implies that if AGN
outflows cause the colour transformation of galaxies, then some nuclear gas and
dust clouds either remain unaffected or relax to the central galaxy regions
after the quenching their star-formation.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:05:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Georgakakis",
"A.",
""
],
[
"Nandra",
"K.",
""
],
[
"Yan",
"R.",
""
],
[
"Willner",
"S. P.",
""
],
[
"Lotz",
"J. M.",
""
],
[
"Pierce",
"C. M.",
""
],
[
"Cooper",
"M. C.",
""
],
[
"Laird",
"E. S.",
""
],
[
"Koo",
"D. C.",
""
],
[
"Barmby",
"P.",
""
],
[
"Newman",
"J. A.",
""
],
[
"Primack",
"J. R.",
""
],
[
"Coil",
"A. L.",
""
]
] | [
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] |
801.2161 | Matthew Hastings | M. B. Hastings | Observations Outside the Light-Cone: Algorithms for Non-Equilibrium and
Thermal States | 19 pages, 12 figures | Phys. Rev. B 77, 144302 (2008). | 10.1103/PhysRevB.77.144302 | null | quant-ph cond-mat.str-el | null | We apply algorithms based on Lieb-Robinson bounds to simulate time-dependent
and thermal quantities in quantum systems. For time-dependent systems, we
modify a previous mapping to quantum circuits to significantly reduce the
computer resources required. This modification is based on a principle of
"observing" the system outside the light-cone. We apply this method to study
spin relaxation in systems started out of equilibrium with initial conditions
that give rise to very rapid entanglement growth. We also show that it is
possible to approximate time evolution under a local Hamiltonian by a quantum
circuit whose light-cone naturally matches the Lieb-Robinson velocity.
Asymptotically, these modified methods allow a doubling of the system size that
one can obtain compared to direct simulation. We then consider a different
problem of thermal properties of disordered spin chains and use quantum belief
propagation to average over different configurations. We test this algorithm on
one dimensional systems with mixed ferromagnetic and anti-ferromagnetic bonds,
where we can compare to quantum Monte Carlo, and then we apply it to the study
of disordered, frustrated spin systems.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:09:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hastings",
"M. B.",
""
]
] | [
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] |
801.2162 | Martin Dominik | M. Dominik, K. Horne, A. Allan, N.J. Rattenbury, Y. Tsapras, C.
Snodgrass, M.F. Bode, M.J. Burgdorf, S.N. Fraser, E. Kerins, C.J. Mottram,
I.A. Steele, R.A. Street, P.J. Wheatley, L. Wyrzykowski | ARTEMiS (Automated Robotic Terrestrial Exoplanet Microlensing Search) -
A possible expert-system based cooperative effort to hunt for planets of
Earth mass and below | 4 pages with 2 eps figures embedded. Accepted for publication in
Astronomische Nachrichten as part of the Proceedings of the Joint VOEvent &
HTN Workshop "Hot-wiring the Transient Universe" held in Tucson, Arizona
(US), June 4-7 2007 | null | 10.1002/asna.200710928 | null | astro-ph | null | (abridged) The technique of gravitational microlensing is currently unique in
its ability to provide a sample of terrestrial exoplanets around both Galactic
disk and bulge stars, allowing to measure their abundance and determine their
distribution with respect to mass and orbital separation. In order to achieve
these goals in reasonable time, a well-coordinated effort involving a network
of either 2m or 4 x 1m telescopes at each site is required. It could lead to
the first detection of an Earth-mass planet outside the Solar system, and even
planets less massive than Earth could be discovered. From April 2008, ARTEMiS
(Automated Robotic Terrestrial Exoplanet Microlensing Search) is planned to
provide a platform for a three-step strategy of survey, follow-up, and anomaly
monitoring. As an expert system embedded in eSTAR (e-Science Telescopes for
Astronomical Research), ARTEMiS will give advice on the optimal targets to be
observed at any given time, and will also alert on deviations from ordinary
microlensing light curves by means of the SIGNALMEN anomaly detector. While the
use of the VOEvent (Virtual Observatory Event) protocol allows a direct
interaction with the telescopes that are part of the HTN (Heterogeneous
Telescope Networks) consortium, additional interfaces provide means of
communication with all existing microlensing campaigns that rely on human
observers. The success of discovering a planet by microlensing critically
depends on the availability of a telescope in a suitable location at the right
time, which can mean within 10 min. Real-time modelling offers the opportunity
of live discovery of extra-solar planets, thereby providing ''Science live to
your home''.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 23:54:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dominik",
"M.",
""
],
[
"Horne",
"K.",
""
],
[
"Allan",
"A.",
""
],
[
"Rattenbury",
"N. J.",
""
],
[
"Tsapras",
"Y.",
""
],
[
"Snodgrass",
"C.",
""
],
[
"Bode",
"M. F.",
""
],
[
"Burgdorf",
"M. J.",
""
],
[
"Fraser",
"S. N.",
""
],
[
"Kerins",
"E.",
""
],
[
"Mottram",
"C. J.",
""
],
[
"Steele",
"I. A.",
""
],
[
"Street",
"R. A.",
""
],
[
"Wheatley",
"P. J.",
""
],
[
"Wyrzykowski",
"L.",
""
]
] | [
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] |
801.2163 | Andreas P. Braun | A.P.Braun, A.Hebecker, H.Triendl | D7-Brane Motion from M-Theory Cycles and Obstructions in the Weak
Coupling Limit | 36 pages, 14 figures, v2: minor errors corrected | Nucl.Phys.B800:298-329,2008 | 10.1016/j.nuclphysb.2008.03.021 | HD-THEP-08-1 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the desire to do proper model building with D7-branes and
fluxes, we study the motion of D7-branes on a Calabi-Yau orientifold from the
perspective of F-theory. We consider this approach promising since, by working
effectively with an elliptically fibred M-theory compactification, the explicit
positioning of D7-branes by (M-theory) fluxes is straightforward. The locations
of D7-branes are encoded in the periods of certain M-theory cycles, which
allows for a very explicit understanding of the moduli space of D7-brane
motion. The picture of moving D7-branes on a fixed underlying space relies on
negligible backreaction, which can be ensured in Sen's weak coupling limit.
However, even in this limit we find certain 'physics obstructions' which reduce
the freedom of the D7-brane motion as compared to the motion of holomorphic
submanifolds in the orientifold background. These obstructions originate in the
intersections of D7-branes and O7-planes, where the type IIB coupling can not
remain weak. We illustrate this effect for D7-brane models on CP^1 x CP^1 (the
Bianchi-Sagnotti-Gimon-Polchinski model) and on CP^2. Furthermore, in the
simple example of 16 D7-branes and 4 O7-planes on CP^1 (F-theory on K3), we
obtain a completely explicit parameterization of the moduli space in terms of
periods of integral M-theory cycles. In the weak coupling limit, D7-brane
motion factorizes from the geometric deformations of the base space.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 22:18:23 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Sep 2008 10:26:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Braun",
"A. P.",
""
],
[
"Hebecker",
"A.",
""
],
[
"Triendl",
"H.",
""
]
] | [
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] |
801.2164 | Edward Pope | Edward Pope (1), Julian Pittard (1), Thomas Hartquist (1), Sam Falle
(2) ((1) School of Physics & Astronomy, University of Leeds, Leeds, UK
(2)School of Applied Mathematics, University of Leeds, Leeds, UK) | The generation of optical emission-line filaments in galaxy clusters | 15 pages, 18 figures. Altered density values in table 1, which were a
factor of 1000 too small. Also extended caption for table 1 to show the mass
outflow rate. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.12963.x | null | astro-ph | null | Recent data support the idea that the filaments observed in H_alpha emission
near the centres of some galaxy clusters were shaped by bulk flows within their
intracluster media. We present numerical simulations of evaporated clump
material interacting with impinging winds to investigate this possibility. In
each simulation, a clump falls due to gravity while the drag of a wind retards
the fall of evaporated material leading to elongation of the tail. However, we
find that long filaments can only form if the outflowing wind velocity is
sufficiently large, 10^8 cm s^-1. Otherwise, the tail material sinks almost as
quickly as the cloud. For reasonable values of parameters, the morphological
structure of a tail is qualitatively similar to those observed in clusters.
Under certain conditions, the kinematics of the tail resemble those reported in
Hatch et al.(2006). A comparison of the observations with the numerical results
indicates that the filaments are likely to be a few tens of Myrs old. We also
present arguments which suggest that the momentum transfer, from an outflowing
wind, in the formation of these filaments is probably significant. As a result,
tail formation could play a role in dissipating some of the energy injected by
a central AGN close to the cluster centre where it is needed most. The trapping
of energy by the cold gas may provide an additional feedback mechanism that
helps to regulate the heating of the central regions of galaxy clusters and
couple the AGN to the ICM.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:36:17 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 10:45:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pope",
"Edward",
""
],
[
"Pittard",
"Julian",
""
],
[
"Hartquist",
"Thomas",
""
],
[
"Falle",
"Sam",
""
]
] | [
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801.2165 | Alberto Iglesias | Gregory Gabadadze and Alberto Iglesias | Special Massive Spin-2 on de Sitter Space | 9 pages, reference added, JCAP version | JCAP 0802:014,2008 | 10.1088/1475-7516/2008/02/014 | NYU-TH-07/12/30 | hep-th | null | The theory of a massive spin-2 state on the de Sitter space -- with the mass
squared equal to one sixth of the curvature -- is special for two reasons: (i)
it exhibits an enhanced local symmetry; (ii) it emerges as a part of the model
that gives rise to the self-accelerated Universe. The known problems of this
theory are: either it cannot be coupled to a non-conformal conserved
stress-tensor because of the enhanced symmetry, or it propagates a ghost-like
state when the symmetry is constrained by the Lagrange multiplier method. Here
we propose a solution to these problems in the linearized approximation.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:38:03 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 19:36:32 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Gabadadze",
"Gregory",
""
],
[
"Iglesias",
"Alberto",
""
]
] | [
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] |
801.2166 | Maxim Lyutikov | Maxim Lyutikov | Hartmann flow with Braginsky viscosity: a test problem for intercluster
plasma | 3 pages, accepted by ApJ | null | 10.1086/526769 | null | astro-ph | null | We consider a Hartmann layer, stationary flow of a viscose and resistive
fluid between two plates with superimposed transverse magnetic field, in the
limit of gyrotropic plasma, when viscosity across the field is strongly
suppressed. For zero cross-field viscosity, the problem is not well posed,
since viscosity then vanishes on the boundaries and in the middle of the layer,
where there is no longitudinal field. An additional arbitrarily small isotropic
viscosity allows one to find magnetic field and velocity profiles which are
independent of this viscosity floor and different from flows with isotropic
viscosity. Velocity sharply rises in a thin boundary layer, which thickness
depends both on the Hartmann number and on the Lundquist number of the flow.
The implication of the work is that, in simulating ICM dynamics it is
imperative to use numerical schemes which take into account anisotropic
viscosity. Although magnetic fields are dynamically subdominant in the ICM they
do determine its the dissipative properties, stability of embedded structures
and the transition to turbulence.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:40:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lyutikov",
"Maxim",
""
]
] | [
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] |
801.2167 | Pavel Yu. Moshin | I.V. Tyutin | Electron scattering by a solenoid | 19 pages, added information: preprint of P.N. Lebedev Physical
Institute, No 27, 1974 | null | null | null | quant-ph hep-th math-ph math.MP | null | The quantum-mechanical problems of electron scattering by an infinitely thin
solenoid and by a half of an infinitely thin solenoid are examined from the
viewpoint of constructing a self-adjoint Hamiltonian. It is demonstrated that
in both problems there exist unique self-adjoint operators with a
``non-singular'' domain, that, due to physical reasons, are identified with the
corresponding Hamiltonians. In the case of quantized values of magnetic flow
along the solenoid, the electron does not experience any scattering by the
string. It is shown that the scattering amplitude and wave function of an
electron in the problem of scattering by an infinitely long solenoid of radius
a in the limit a->0 turn into the corresponding expressions for the problem of
an infinitely thin solenoid. In particular, at a quantized value of magnetic
flow along the solenoid, scattering disappears at a->0.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 21:48:59 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Jan 2008 23:13:27 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Tyutin",
"I. V.",
""
]
] | [
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] |
801.2168 | Cornelia C. Lang | Cornelia C. Lang, Patrick Palmer and W. M. Goss | Non-thermal Emission in Sagittarius B? | 11 pages, 1 figure; invited review paper for the Galactic Center
Newsletter (Jan 2008) see http://www.aoc.nrao.edu/~gcnews/index.shtml;
revised and added an abstract to the document and made a few other minor
changes | null | null | null | astro-ph | null | We summarize three recent publications which suggest that the Galactic center
region Sagittarius B (Sgr B) may contain non-thermal radio components (Crocker
et al. 2007, Hollis et al. 2007 and Yusef-Zadeh et al. 2007a). Based on new VLA
matched-resolution continuum data at 327 MHz and 1.4 GHz, we find no evidence
for large scale non-thermal radio emission at these frequencies; the spectral
behavior is likely determined by the complex summation of multiple HII region
components with a wide range of emission measures and hence radio turn-over
frequencies. Also, we discuss a possible additional interpretation of the radio
continuum spectrum of individual component Sgr B2-F carried out by Yusef-Zadeh
et al; confusion from nearby HII components with widely different turn-over
frequencies may contribute to the the change in slope of the radio continuum in
this direction at low frequencies. Finally, we discuss the uncertainties in the
determination of the spectral index of the GBT continuum data of Sgr B carried
out by Hollis et al. We find that the apparent spectral index determined by
their procedure is also likely due to a summation over the many diverse thermal
components in this direction.
| [
{
"version": "v1",
"created": "Tue, 15 Jan 2008 17:27:34 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 20:01:14 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Lang",
"Cornelia C.",
""
],
[
"Palmer",
"Patrick",
""
],
[
"Goss",
"W. M.",
""
]
] | [
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801.2169 | Hsiao-Wen Chen | Hsiao-Wen Chen and Jeremy L. Tinker (U Chicago, KICP) | The Baryon Content of Dark Matter Halos: Empirical Constraints from MgII
Absorbers | 13 pages, 6 figures, ApJ in press; high-resolution version available
at http://lambda.uchicago.edu/public/tmp/mg2_CT08.pdf | null | 10.1086/591927 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have initiated a survey of MgII 2796, 2803 absorbers near known galaxies
at projected distances rho<~100 h^-1 kpc to a background QSO, in order to
constrain the extent and covering fraction of Mg^+ ions around galaxies of
different luminosity and mass. The current sample consists of 13 galaxy and
absorber pairs and 10 galaxies that do not produce MgII absorption lines to
within sensitive upper limits. The redshifts of the galaxy and absorber pairs
range from z = 0.2067 to 0.892 with a median of z = 0.3818. We find that
galaxies at larger impact parameters produce on average weaker MgII absorbers.
This anti-correlation is substantially improved when accounting for the
intrinsic luminosities of individual galaxies. In addition, there exists a
distinct boundary at rho=R_gas, beyond which no MgII absorbers are found. A
maximum likelihood analysis shows that the observations are best described by
an isothermal density profile and a scaling relation R_gas = 91 x
(L_B/L_{B_*})^(0.35 +/- 0.05) h^-1 kpc (or 69 h^-1 kpc at W(2796)=0.3 Ang) with
a mean covering factor of <kappa>=80-86%. Together with the scaling relation
between halo mass and galaxy luminosity inferred from halo occupation studies,
this scaling of R_gas indicates that gas radius is a fixed fraction of the dark
matter halo radius. We compare our results with previous studies and discuss
the implications of our analysis for constraining the baryon content of
galactic halos and for discriminating between competing scenarios for
understanding the nature of the extended gas.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 22:00:10 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jul 2008 20:53:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chen",
"Hsiao-Wen",
"",
"U Chicago, KICP"
],
[
"Tinker",
"Jeremy L.",
"",
"U Chicago, KICP"
]
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801.217 | Chandrasekhar Ramanathan | Chandrasekhar Ramanathan | Dynamic nuclear polarization and spin-diffusion in non-conducting solids | submitted to Applied Magnetic Resonance. The article should appear in
a special issue that is being published in connection with the DNP Symposium
help in Nottingham in August 2007 | Appl. Magn. Reson. 34, 409-421 (2008) | 10.1007/s00723-008-0123-7 | null | cond-mat.other | null | There has been much renewed interest in dynamic nuclear polarization (DNP),
particularly in the context of solid state biomolecular NMR and more recently
dissolution DNP techniques for liquids. This paper reviews the role of spin
diffusion in polarizing nuclear spins and discusses the role of the spin
diffusion barrier, before going on to discuss some recent results.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 22:12:43 GMT"
}
] | 2009-04-01T00:00:00 | [
[
"Ramanathan",
"Chandrasekhar",
""
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801.2171 | Morris Hirsch | Morris W. Hirsch | On existence and uniqueness of the carrying simplex for competitive
dynamical systems | Submitted to Journal of Biological Dynamics. 13 pages | null | null | null | math.DS | null | Certain dynamical models of competition have a unique invariant hypersurface
to whichevery nonzero tractory is asymptotic, having simple geometry and
topology.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 22:14:45 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Hirsch",
"Morris W.",
""
]
] | [
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801.2172 | Martha Boyer | Martha L. Boyer (1), Iain McDonald (2), Jacco Th. van Loon (2),
Charles E. Woodward (1), Robert D. Gehrz (1), A. Evans (2), A. K. Dupree (3)
((1) Department of Astronomy, University of Minnesota, Minneapolis, MN (2)
Astrophysics Group, School of Physical & Geographical Sciences, Keele
University, UK (3) Harvard-Smithsonian Center for Astrophysics, Cambridge,
MA) | A Spitzer Space Telescope Atlas of omega Centauri: The Stellar
Population, Mass Loss, and the Intracluster Medium | 20 pages, 18 figures, 8 tables, accepted for publication in AJ | Astron.J.135:1395-1411,2008 | 10.1088/0004-6256/135/4/1395 | null | astro-ph | null | We present a Spitzer Space Telescope imaging survey of the most massive
Galactic globular cluster, omega Centauri, and investigate stellar mass loss at
low metallicity and the intracluster medium (ICM). The survey covers
approximately 3.2x the cluster half-mass radius at 3.6, 4.5, 5.8, 8, and 24
microns, resulting in a catalog of over 40,000 point-sources in the cluster.
Approximately 140 cluster members ranging 1.5 dex in metallicity show a red
excess at 24 microns, indicative of circumstellar dust. If all of the dusty
sources are experiencing mass loss, the cumulative rate of loss is estimated at
2.9 - 4.2 x 10^(-7) solar masses per year, 63% -- 66% of which is supplied by
three asymptotic giant branch stars at the tip of the Red Giant Branch (RGB).
There is little evidence for strong mass loss lower on the RGB. If this
material had remained in the cluster center, its dust component (> 1 x 10^(-4)
solar masses) would be detectable in our 24 and 70 micron images. While no dust
cloud located at the center of omega Cen is apparent, we do see four regions of
very faint, diffuse emission beyond two half-mass radii at 24 microns. It is
unclear whether these dust clouds are foreground emission or are associated
with omega Cen. In the latter case, these clouds may be the ICM in the process
of escaping from the cluster.
| [
{
"version": "v1",
"created": "Mon, 14 Jan 2008 22:24:02 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Boyer",
"Martha L.",
""
],
[
"McDonald",
"Iain",
""
],
[
"van Loon",
"Jacco Th.",
""
],
[
"Woodward",
"Charles E.",
""
],
[
"Gehrz",
"Robert D.",
""
],
[
"Evans",
"A.",
""
],
[
"Dupree",
"A. K.",
""
]
] | [
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