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711.2008 | Tobias Schmidt | Tobias Schmidt | Analytic vectors in continuous p-adic representations | Final version (appeared in Comp. Math. 2009). Exposition shortened.
Minor items corrected | null | 10.1112/S0010437X08003825 | null | math.RT math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a compact p-adic Lie group G over a finite unramified extension L/Q_p
let G_0 be the product over all Galois conjugates of G. We construct an exact
and faithful functor from admissible G-Banach space representations to
admissible locally L-analytic G_0-representations that coincides with passage
to analytic vectors in case L=Q_p. On the other hand, we study the functor
"passage to analytic vectors" and its derived functors over general basefields.
As an application we determine the higher analytic vectors in certain locally
analytic induced representations.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 15:39:02 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2012 21:26:02 GMT"
}
] | 2014-01-14T00:00:00 | [
[
"Schmidt",
"Tobias",
""
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711.2009 | Mats Granath | M. Granath | Fermi momentum resolved charge order for spin disordered stripes | 9 pages, 5 figures, added references and extended discussion of Hall
coefficient for stripe ordered system; v3 final, improved figures | Phys. Rev. B 77, 165128 (2008) | 10.1103/PhysRevB.77.165128 | null | cond-mat.str-el cond-mat.supr-con | null | For a doped antiferromagnet with short-range spin stripe correlations and
long-range charge stripe order we find that the manifestation of charge order
changes abruptly as a function of momentum along the Fermi surface. The
disorder averaged local density of states is almost perfectly homogeneous when
integrated only over states which contribute to the ``nodal'' spectral weight
whereas it displays long range charge stripe order when integrated only over
states which contribute to the ``antinodal'' spectral weight. An effectively
two dimensional nodal liquid can thus coexist with static charge stripes
provided there is no static spin order. We also study commensurate spin and
charge stripe ordered systems where the Fermi surface consists of a nodal hole
pocket and an open ``stripe band'' section. Due to the stripe order the
relation between hole density and size of a pocket will be reduced compared to
a paramagnet by a factor of two for even charge period and four for odd charge
period and we find an estimated upper limit on the area fraction of a hole
pocket of 1.6% for charge period four and 4% for charge period five. We also
discuss why electron pockets are not expected for a stripe ordered system and
show that the open Fermi surface section may be electron like with a negative
Hall coefficient.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 15:48:37 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Dec 2007 09:39:59 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Apr 2008 06:52:34 GMT"
}
] | 2008-04-23T00:00:00 | [
[
"Granath",
"M.",
""
]
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711.201 | Reiner Czerwinski | Reiner Czerwinski | A Polynomial Time Algorithm for Graph Isomorphism | null | null | null | null | cs.CC | http://creativecommons.org/licenses/by/4.0/ | We claimed that there is a polynomial algorithm to test if two graphs are
isomorphic. But the algorithm is wrong. It only tests if the adjacency matrices
of two graphs have the same eigenvalues. There is a counterexample of two
non-isomorphic graphs with the same eigenvalues.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 15:51:33 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Nov 2007 20:23:00 GMT"
},
{
"version": "v3",
"created": "Thu, 13 Dec 2007 14:51:55 GMT"
},
{
"version": "v4",
"created": "Wed, 23 Jan 2008 15:10:16 GMT"
},
{
"version": "v5",
"created": "Sat, 15 Oct 2022 15:56:47 GMT"
}
] | 2022-10-18T00:00:00 | [
[
"Czerwinski",
"Reiner",
""
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] |
711.2011 | Zhi-Yong Wang | Zhi-Yong Wang, Cai-Dong Xiong, Bing He | Arrival time in quantum field theory | 15 pages, A detailed version with a appendix, to be published in
Physics Letters B | Physics Letters B 666 (2008) 382-385 | 10.1016/j.physletb.2008.07.069 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Via the proper-time eigenstates (event states) instead of the proper-mass
eigenstates (particle states), free-motion time-of-arrival theory for massive
spin-1/2 particles is developed at the level of quantum field theory. The
approach is based on a position-momentum dual formalism. Within the framework
of field quantization, the total time-of-arrival is the sum of the single
event-of-arrival contributions, and contains zero-point quantum fluctuations
because the clocks under consideration follow the laws of quantum mechanics.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 18:13:56 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 16:39:36 GMT"
},
{
"version": "v3",
"created": "Mon, 7 Apr 2008 03:31:54 GMT"
},
{
"version": "v4",
"created": "Mon, 28 Jul 2008 23:57:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Zhi-Yong",
""
],
[
"Xiong",
"Cai-Dong",
""
],
[
"He",
"Bing",
""
]
] | [
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] |
711.2012 | Ashley Montanaro | Ashley Montanaro | A lower bound on the probability of error in quantum state
discrimination | 4 pages; v2 fixes typos and adds remarks; v3 adds a new reference | In Proc. IEEE Information Theory Workshop 2008, pp. 378-380 | 10.1109/ITW.2008.4578690 | null | quant-ph | null | We give a lower bound on the probability of error in quantum state
discrimination. The bound is a weighted sum of the pairwise fidelities of the
states to be distinguished.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:04:40 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Mar 2008 08:56:29 GMT"
},
{
"version": "v3",
"created": "Mon, 19 May 2008 08:00:30 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Montanaro",
"Ashley",
""
]
] | [
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] |
711.2013 | Mikhail V. Gorbatenko | M.V.Gorbatenko and G.G.Kochemasov | A Conformally Invariant Approach to Estimation of Relations Between
Physical Quantities | null | null | null | null | gr-qc | null | A.V.Pushkin's approach based on conformal geometrodynamics (CGD) to
calculation of quantitative relations between physical quantities is presented
and analyzed. In the simplest cases of the stationary solutions to the CGD
equations the approach implies separation of internal and external parts
(relative to a certain boundary) from the solutions and using inverse
transformations transforming the parts into each other. For the
quasi-stationary (metastable) states, the possibility of the nonperturbative
calculation of their lifetimes is shown. The approach is illustrated by several
examples. In particular, it is shown that the Dirac ``large number hypothesis''
is a consequence of the approach. Also, the evaluated radiation lifetime of the
first excited level of 2p hydrogen atom and neutron lifetime are presented.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 15:59:24 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Gorbatenko",
"M. V.",
""
],
[
"Kochemasov",
"G. G.",
""
]
] | [
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] |
711.2014 | Giuseppe Nardulli | M. V. Carlucci, F. Giannuzzi, G. Nardulli, M. Pellicoro and S.
Stramaglia | AdS-QCD quark-antiquark potential, meson spectrum and tetraquarks | 15 pages, 4 figures | Eur.Phys.J.C57:569-578,2008 | 10.1140/epjc/s10052-008-0687-2 | BARI-TH 584-07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | AdS/QCD correspondence predicts the structure of quark-antiquark potential in
the static limit. We use this piece of information together with the Salpeter
equation (Schr\"odinger equation with relativistic kinematics) and a short
range hyperfine splitting potential to determine quark masses and the quark
potential parameters from the meson spectrum. The agreement between theory and
experimental data is satisfactory provided one considers only mesons comprising
at least one heavy quark. We use the same potential (in the one-gluon-exchange
approximation) and these data to estimate constituent diquark masses. Using
these results as an input we compute tetraquark masses using a
diquark-antidiquark model. The masses of the states X(3872) or Y(3940) are
predicted rather accurately. We also compute tetraquark masses with open charm
and strangeness. Our result is that tetraquark candidates such as D_s(2317),
D_s(2457) or X(2632) can hardly be interpreted as diquark-antidiquark states
within the present approach.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:01:58 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jul 2008 13:24:21 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Carlucci",
"M. V.",
""
],
[
"Giannuzzi",
"F.",
""
],
[
"Nardulli",
"G.",
""
],
[
"Pellicoro",
"M.",
""
],
[
"Stramaglia",
"S.",
""
]
] | [
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] |
711.2015 | Sean Raymond | Sean N. Raymond, Rory Barnes, Avi M. Mandell | Observable Consequences of Planet Formation Models in Systems with
Close-in Terrestrial Planets | Accepted to MNRAS. 14 pages, 4 figures, 1 table | null | 10.1111/j.1365-2966.2007.12712.x | null | astro-ph | null | To date, two planetary systems have been discovered with close-in,
terrestrial-mass planets (< 5-10 Earth masses). Many more such discoveries are
anticipated in the coming years with radial velocity and transit searches. Here
we investigate the different mechanisms that could form "hot Earths" and their
observable predictions. Models include: 1) in situ accretion; 2) formation at
larger orbital distance followed by inward "type 1" migration; 3) formation
from material being "shepherded" inward by a migrating gas giant planet; 4)
formation from material being shepherded by moving secular resonances during
dispersal of the protoplanetary disk; 5) tidal circularization of eccentric
terrestrial planets with close-in perihelion distances; and 6)
photo-evaporative mass loss of a close-in giant planet. Models 1-4 have been
validated in previous work. We show that tidal circularization can form hot
Earths, but only for relatively massive planets (> 5 Earth masses) with very
close-in perihelion distances (< 0.025 AU), and even then the net inward
movement in orbital distance is at most only 0.1-0.15 AU. For planets of less
than about 70 Earth masses, photo-evaporation can remove the planet's envelope
and leave behind the solid core on a Gyr timescale, but only for planets inside
0.025-0.05 AU. Using two quantities that are observable by current and upcoming
missions, we show that these models each produce unique signatures, and can be
observationally distinguished. These observables are the planetary system
architecture (detectable with radial velocities, transits and transit-timing)
and the bulk composition of transiting close-in terrestrial planets (measured
by transits via the planet's radius).
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:02:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Raymond",
"Sean N.",
""
],
[
"Barnes",
"Rory",
""
],
[
"Mandell",
"Avi M.",
""
]
] | [
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] |
711.2016 | Michele Bellazzini | M. Bellazzini (INAF-Oabo) | The Tip of the Red Giant Branch | 8 pages, 6 greyscale figures. Invited review. Proceedings of the
workshop "XXI Century challenges for stellar evolution", held in Cefalu'
(Sicily, Italy), August 29 - September 2, 2007; S. Cassisi and M. Salaris
Eds. To be published in Mem. SAIt Vol. 79 No. 2 | null | null | null | astro-ph | null | I review the latest results on the calibration of the Tip of the Red Giant
Branch as a standard candle, in the optical and in the near infrared. The
agreement among different and independent empirical calibrations is rather
good, if all the uncertainties are taken into account. The possible extension
of the calibration to SDSS photometric bands (i,z) is also discussed.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:02:35 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Bellazzini",
"M.",
"",
"INAF-Oabo"
]
] | [
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] |
711.2017 | Jan Forbrich | Jan Forbrich (1,2), Karl M. Menten (1), and Mark J. Reid (2), ((1)
Max-Planck-Institut f\"ur Radioastronomie, Bonn, Germany (2)
Harvard-Smithsonian Center for Astrophysics, Cambridge, USA) | A 1.3 cm wavelength radio flare from a deeply embedded source in the
Orion BN/KL region | 7 pages, 5 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20078070 | null | astro-ph | null | Aims: Our aim was to measure and characterize the short-wavelength radio
emission from young stellar objects (YSOs) in the Orion Nebula Cluster and the
BN/KL star-forming region. Methods: We used the NRAO Very Large Array at a
wavelength of 1.3 cm and we studied archival X-ray, infrared, and radio data.
Results: During our observation, a strong outburst (flux increasing >10 fold)
occurred in one of the 16 sources detected at a wavelength of 1.3cm, while the
others remained (nearly) constant. This source does not have an infrared
counterpart, but has subsequently been observed to flare in X-rays. Curiously,
a very weak variable double radio source was found at other epochs near this
position, one of whose components is coincident with it. A very high extinction
derived from modeling the X-ray emission and the absence of an infrared
counterpart both suggest that this source is very deeply embedded.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:02:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Forbrich",
"Jan",
""
],
[
"Menten",
"Karl M.",
""
],
[
"Reid",
"Mark J.",
""
]
] | [
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] |
711.2018 | Michele Maltoni | Michele Maltoni | Sterile neutrinos after the first MiniBooNE results | 5 pages, LaTeX file using jpconf style, 3 figures included.
Proceedings of "The 2007 Europhysics Conference on High Energy Physics",
Manchester, England, July 19-25, 2007. Typos corrected | J.Phys.Conf.Ser.110:082011,2008 | 10.1088/1742-6596/110/8/082011 | IFT-UAM/CSIC-07-59 | hep-ph | null | In view of the recent results from the MiniBooNE experiment we revisit the
global neutrino oscillation fit to short-baseline neutrino data by adding one,
two or three sterile neutrinos with eV-scale masses to the three Standard Model
neutrinos. We find that four-neutrino oscillations of the (3+1) type, which
have been only marginally allowed before the recent MiniBooNE results, become
even more disfavored with the new data. In the framework of so-called (3+2)
five-neutrino mass schemes the MiniBooNE results can be nicely reconciled with
the LSND appearance evidence thanks to the possibility of CP violation
available in such oscillation schemes; however, the tension between appearance
and disappearance experiments represents a serious problem in (3+2) schemes, so
that these models are ultimately not viable. This tension remains also when a
third sterile neutrino is added, and we do not find a significant improvement
of the global fit in a (3+3) scheme.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:03:42 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 16:13:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Maltoni",
"Michele",
""
]
] | [
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] |
711.2019 | Roberto Casadio | Corrado Appignani and Roberto Casadio | Hints of (trans-Planckian) asymptotic freedom in semiclassical cosmology | 11 pages, 2 figures; replaced to match content of published version | JCAP0806:014,2008 | 10.1088/1475-7516/2008/06/014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ the semiclassical approximation to the Wheeler-DeWitt equation in
the spatially flat de Sitter Universe to investigate the dynamics of a
minimally coupled scalar field near the Planck scale. We find that, contrary to
naive intuition, the effects of quantum gravitational fluctuations become
negligible and the scalar field states asymptotically approach plane-waves at
very early times. These states can then be used as initial conditions for the
quantum states of matter to show that each mode essentially originated in the
minimum energy vacuum. Although the full quantum dynamics cannot be solved
exactly for the case at hand, our results can be considered as supporting the
general idea of asymptotic safety in quantum gravity.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:09:29 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Apr 2008 18:58:56 GMT"
},
{
"version": "v3",
"created": "Thu, 24 Jul 2008 09:15:28 GMT"
}
] | 2008-11-07T00:00:00 | [
[
"Appignani",
"Corrado",
""
],
[
"Casadio",
"Roberto",
""
]
] | [
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] |
711.202 | Georg Weiglein | T. Hahn, S. Heinemeyer, W. Hollik, H. Rzehak, G. Weiglein and K.E.
Williams | CP-violating Loop Effects in the Higgs Sector of the MSSM | 5 pages, contribution to the proceedings of LCWS/ILC 2007 | ECONF C0705302:HIG19,2007 | null | IPPP/07/84, DCPT/07/168 | hep-ph | null | CP-violating effects in the Higgs sector of the Minimal Supersymmetric
Standard Model with complex parameters (cMSSM) are induced by potentially large
higher-order corrections. As a consequence, all three neutral Higgs bosons can
mix with each other. Recent results for loop corrections in the Higgs sector of
the cMSSM are reviewed. Results for propagator-type corrections of O(alpha_t
alpha_s) and complete one-loop results for Higgs cascade decays of the kind h_a
-> h_b h_c are summarised, and the proper treatment of external Higgs bosons in
Higgs-boson production and decay processes is discussed.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:13:38 GMT"
}
] | 2009-02-16T00:00:00 | [
[
"Hahn",
"T.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Hollik",
"W.",
""
],
[
"Rzehak",
"H.",
""
],
[
"Weiglein",
"G.",
""
],
[
"Williams",
"K. E.",
""
]
] | [
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711.2021 | Rigoberto Ju\'arez-Maldonado | Rigoberto Ju\'arez-Maldonado and Magdaleno Medina-Noyola | A New Theory of Dynamic Arrest in Colloidal Mixtures | 1 text archive and 7 figures | null | 10.1103/PhysRevE.77.051503 | null | cond-mat.mtrl-sci | null | We present a new first-principles theory of dynamic arrest in colloidal
mixtures based on the multi-component self-consistent generalized Langevin
equation (SCGLE) theory of colloid dynamics [Phys. Rev. E {\bf 72}, 031107
(2005); ibid {\bf 76}, 039902 (2007)]. We illustrate its application with the
description of dynamic arrest in two simple model colloidal mixtures, namely,
the hard-sphere and the repulsive Yukawa binary mixtures. Our results include
the observation of the two patterns of dynamic arrest, one in which both
species become simultaneously arrested, and the other involving the sequential
arrest of the two species. The latter case gives rise to mixed states in which
one species is arrested while the other species remains mobile. We also derive
the ("fixed point") equations for the non-ergodic parameters of the system,
which takes the surprisingly simple form of a system of coupled equations for
the localization length of the particles of each species. The solution of this
system of equations indicates unambiguously which species is arrested (finite
localization length) and which species remains ergodic (infinite localization
length). As a result, we are able to draw the entire ergodic--non-ergodic phase
diagram of the binary hard-sphere mixture.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:15:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Juárez-Maldonado",
"Rigoberto",
""
],
[
"Medina-Noyola",
"Magdaleno",
""
]
] | [
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] |
711.2022 | Igor M. Suslov | A.A.Pogorelov and I.M.Suslov (Kapitza Institute for Physical Problems,
Moscow, Russia) | On the Critical Exponents for the \Lambda-Transition in Liquid Helium | PDF, 7 pages | Pis'ma Zh.Eksp.Teor.Fiz., v.86, p.41 (2007) [JETP Letters, v.86,
p.39 (2007)] | 10.1134/S0021364007130097 | null | cond-mat.stat-mech hep-ph hep-th | null | The use of a new method for summing divergent series makes it possible to
significantly increase the accuracy of determining the critical exponents from
the field theoretical renormalization group. The exponent value \nu=0.6700\pm
0.0006 for the \lambda-transition in liquid helium is in good agreement with
the experiment, but contradicts the last theoretical results based on using
high-temperature series, the Monte Carlo method, and their synthesis.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:22:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pogorelov",
"A. A.",
"",
"Kapitza Institute for Physical Problems,\n Moscow, Russia"
],
[
"Suslov",
"I. M.",
"",
"Kapitza Institute for Physical Problems,\n Moscow, Russia"
]
] | [
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] |
711.2023 | Peter Turney | Peter D. Turney (National Research Council of Canada) | Empirical Evaluation of Four Tensor Decomposition Algorithms | related work available at http://purl.org/peter.turney/ | null | null | ERB-1152, NRC-49877 | cs.LG cs.CL cs.IR | null | Higher-order tensor decompositions are analogous to the familiar Singular
Value Decomposition (SVD), but they transcend the limitations of matrices
(second-order tensors). SVD is a powerful tool that has achieved impressive
results in information retrieval, collaborative filtering, computational
linguistics, computational vision, and other fields. However, SVD is limited to
two-dimensional arrays of data (two modes), and many potential applications
have three or more modes, which require higher-order tensor decompositions.
This paper evaluates four algorithms for higher-order tensor decomposition:
Higher-Order Singular Value Decomposition (HO-SVD), Higher-Order Orthogonal
Iteration (HOOI), Slice Projection (SP), and Multislice Projection (MP). We
measure the time (elapsed run time), space (RAM and disk space requirements),
and fit (tensor reconstruction accuracy) of the four algorithms, under a
variety of conditions. We find that standard implementations of HO-SVD and HOOI
do not scale up to larger tensors, due to increasing RAM requirements. We
recommend HOOI for tensors that are small enough for the available RAM and MP
for larger tensors.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:28:47 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Turney",
"Peter D.",
"",
"National Research Council of Canada"
]
] | [
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] |
711.2024 | Junfeng Wang | Junfeng Wang, Leisa K. Townsley, Eric D. Feigelson, Patrick S. Broos,
Konstantin V. Getman (1), Carlos Roman-Zuniga (2,3), and Elizabeth Lada (3)
((1) Penn State (2) Harvard-Smithsonian Center for Astrophysics (3)
University of Florida) | A Chandra Study of the Rosette Star-Forming Complex. I. The Stellar
Population and Structure of the Young Open Cluster NGC 2244 | Accepted for publication in ApJ (March 1, 2008 v675 issue). 61 pages,
20 figures, 7 tables. Updated a statement on NGC 2244-334 and added a
reference | null | 10.1086/526406 | null | astro-ph | null | We present the first high spatial resolution Chandra X-ray study of NGC 2244,
the 2 Myr old stellar cluster immersed in the Rosette Nebula. Over 900 X-ray
sources are detected; 77% have optical or FLAMINGOS near-infrared (NIR) stellar
counterparts and are mostly previously uncatalogued young stellar cluster
members. All known OB stars with spectral type earlier than B1 are detected and
the X-ray selected stellar population is estimated to be nearly complete
between 0.5 and 3 Msun. The X-ray luminosity function (XLF) ranges from
29.4<logLx<32 ergs/s in the hard (2-8keV) band. By comparing the NGC 2244 and
Orion Nebula Cluster XLFs, we estimate a total population of 2000 stars in NGC
2244. A number of further results emerge from our analysis: The XLF and the
associated K-band luminosity function indicate a normal Salpeter initial mass
function (IMF) for NGC 2244. This is inconsistent with the top-heavy IMF
reported from earlier optical studies that lacked a good census of <4Msun
stars. The spatial distribution of X-ray stars is strongly concentrated around
the central O5 star, HD 46150. The other early O star, HD 46223, has few
companions. The cluster's stellar radial density profile shows two distinctive
structures. This double structure, combined with the absence of mass
segregation, indicates that this cluster is not in dynamical equilibrium. The
spatial distribution of X-ray selected K-excess disk stars and embedded stars
is asymmetric with an apparent deficit towards the north. The fraction of
X-ray-selected cluster members with K-band excesses caused by inner
protoplanetary disks is 6%, slightly lower than the 10% disk fraction estimated
from the FLAMINGOS study based on the NIR-selected sample. This is due to the
high efficiency of X-ray surveys in locating disk-free T Tauri stars.[Abridged]
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:48:36 GMT"
},
{
"version": "v2",
"created": "Wed, 14 Nov 2007 18:27:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Junfeng",
""
],
[
"Townsley",
"Leisa K.",
""
],
[
"Feigelson",
"Eric D.",
""
],
[
"Broos",
"Patrick S.",
""
],
[
"Getman",
"Konstantin V.",
""
],
[
"Roman-Zuniga",
"Carlos",
""
],
[
"Lada",
"Elizabeth",
""
]
] | [
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] |
711.2025 | Jan Perina Jr. | Jan Perina Jr | Quantum properties of counter-propagating two-photon states generated in
a planar waveguide | 14 pages, 9 figures | Phys. Rev. A 77 (2008) 013803 | 10.1103/PhysRevA.77.013803 | null | quant-ph | null | A nonlinear planar waveguide pumped by a beam orthogonal to its surface may
serve as a versatile source of photon pairs. Changing pump-pulse duration,
pump-beam transverse width, and angular decomposition of pump-beam frequencies
characteristics of a photon pair including spectral widths of signal and idler
fields, their time durations as well as degree of entanglement of two fields
can be changed significantly. Using the measured spectral widths of the
down-converted fields and width of a coincidence-count dip in a Hong-Ou-Mandel
interferometer entropy of entanglement can be determined.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:35:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Perina",
"Jan",
"Jr"
]
] | [
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] |
711.2026 | David Shupe | David L. Shupe, Michael Rowan-Robinson, Carol J. Lonsdale, Frank
Masci, Tracey Evans, Fan Fang, Sebastian Oliver, Mattia Vaccari, Giulia
Rodighiero, Deborah Padgett, Jason A. Surace, C. Kevin Xu, Stefano Berta,
Francesca Pozzi, Alberto Franceschini, Thomas Babbedge, Eduardo
Gonzales-Solares, Brian D. Siana, Duncan Farrah, David T. Frayer, H. E.
Smith, Maria Polletta, Frazer Owen, and Ismael Perez-Fournon | Galaxy Counts at 24 Microns in the SWIRE Fields | 10 pages, 8 figures, accepted 3 November 2007 for publication in The
Astronomical Journal, formatted with emulateapj style | null | 10.1088/0004-6256/135/3/1050 | null | astro-ph | null | This paper presents galaxy source counts at 24 microns in the six Spitzer
Wide-field InfraRed Extragalactic (SWIRE) fields. The source counts are
compared to counts in other fields, and to model predictions that have been
updated since the launch of Spitzer. This analysis confirms a very steep rise
in the Euclidean-normalized differential number counts between 2 mJy and 0.3
mJy. Variations in the counts between fields show the effects of sample
variance in the flux range 0.5-10 mJy, up to 100% larger than Poisson errors.
Nonetheless, a "shoulder" in the normalized counts persists at around 3 mJy.
The peak of the normalized counts at 0.3 mJy is higher and narrower than most
models predict. In the ELAIS N1 field, the 24 micron data are combined with
Spitzer-IRAC data and five-band optical imaging, and these bandmerged data are
fit with photometric redshift templates. Above 1 mJy the counts are dominated
by galaxies at z less than 0.3. By 300 microJy, about 25% are between z ~
0.3-0.8, and a significant fraction are at z ~ 1.3-2. At low redshifts the
counts are dominated by spirals, and starbursts rise in number density to
outnumber the spirals' contribution to the counts below 1 mJy.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 18:34:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shupe",
"David L.",
""
],
[
"Rowan-Robinson",
"Michael",
""
],
[
"Lonsdale",
"Carol J.",
""
],
[
"Masci",
"Frank",
""
],
[
"Evans",
"Tracey",
""
],
[
"Fang",
"Fan",
""
],
[
"Oliver",
"Sebastian",
""
],
[
"Vaccari",
"Mattia",
""
],
[
"Rodighiero",
"Giulia",
""
],
[
"Padgett",
"Deborah",
""
],
[
"Surace",
"Jason A.",
""
],
[
"Xu",
"C. Kevin",
""
],
[
"Berta",
"Stefano",
""
],
[
"Pozzi",
"Francesca",
""
],
[
"Franceschini",
"Alberto",
""
],
[
"Babbedge",
"Thomas",
""
],
[
"Gonzales-Solares",
"Eduardo",
""
],
[
"Siana",
"Brian D.",
""
],
[
"Farrah",
"Duncan",
""
],
[
"Frayer",
"David T.",
""
],
[
"Smith",
"H. E.",
""
],
[
"Polletta",
"Maria",
""
],
[
"Owen",
"Frazer",
""
],
[
"Perez-Fournon",
"Ismael",
""
]
] | [
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] |
711.2027 | Luigi Iapichino | L. Iapichino, M. Br\"uggen, W. Hillebrandt, J. C. Niemeyer | The ignition process in type Ia supernovae: numerical simulations of
core temperature perturbations | 4 pages, 2 figures, proceedings of the Catania Workshop on Nuclear
and Neutrino Astrophysics (WNNA 2007) | null | null | null | astro-ph | null | The onset of the thermonuclear runaway in a Chandrasekhar-mass white dwarf,
leading to the explosion as a type Ia supernova, is studied with hydrodynamical
simulations. We investigate the evolution of temperature fluctuations
(``bubbles'') in the WD's convective core by means of 2D numerical simulations.
We show how the occurrence of the thermonuclear runaway depends on various
bubble parameters. The relevance of the progenitor's composition for the
ignition process is also discussed.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:46:20 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Iapichino",
"L.",
""
],
[
"Brüggen",
"M.",
""
],
[
"Hillebrandt",
"W.",
""
],
[
"Niemeyer",
"J. C.",
""
]
] | [
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] |
711.2028 | Paulo C. Freire | Paulo C. C. Freire, Scott M. Ransom, Steve Begin, Ingrid H. Stairs,
Jason W. T. Hessels, Lucille H. Frey, Fernando Camilo | Eight new MSPs in NGC 6440 and NGC 6441 | 3 pages, 3 figures. To appear in the proceedings of "40 Years of
Pulsars: Millisecond Pulsars, Magnetars, and More", August 12-17, 2007,
McGill University, Montreal, Canada | AIPConf.Proc.983:604-606,2008 | 10.1063/1.2900307 | null | astro-ph | null | We report the discovery of five new millisecond pulsars in the globular
cluster NGC 6440 and three new ones in NGC 6441; each cluster has one
previously known pulsar. Four of the new pulsars are found in binary systems.
One of the new pulsars, PSR J1748-2021B in NGC 6440, is notable for its
eccentric (e = 0.57) and wide (P_b = 20.5 days) orbit. If the rate of advance
of periastron is due solely to general relativity, we can estimate of the total
mass of this binary system: 2.92 +/- 0.20 solar masses. This would imply an
anomalously large mass for this pulsar, which could introduce important
constraints in the study of the equation of state for cold neutron matter.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 18:14:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Freire",
"Paulo C. C.",
""
],
[
"Ransom",
"Scott M.",
""
],
[
"Begin",
"Steve",
""
],
[
"Stairs",
"Ingrid H.",
""
],
[
"Hessels",
"Jason W. T.",
""
],
[
"Frey",
"Lucille H.",
""
],
[
"Camilo",
"Fernando",
""
]
] | [
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] |
711.2029 | Bertrand Georgeot | J. Martin, O. Giraud and B. Georgeot | Multifractality and intermediate statistics in quantum maps | 4 pages, 4 figures | Phys. Rev. E 77, 035201(R) (2008) | 10.1103/PhysRevE.77.035201 | null | nlin.CD cond-mat.mes-hall | null | We study multifractal properties of wave functions for a one-parameter family
of quantum maps displaying the whole range of spectral statistics intermediate
between integrable and chaotic statistics. We perform extensive numerical
computations and provide analytical arguments showing that the generalized
fractal dimensions are directly related to the parameter of the underlying
classical map, and thus to other properties such as spectral statistics. Our
results could be relevant for Anderson and quantum Hall transitions, where wave
functions also show multifractality.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:56:06 GMT"
}
] | 2008-03-18T00:00:00 | [
[
"Martin",
"J.",
""
],
[
"Giraud",
"O.",
""
],
[
"Georgeot",
"B.",
""
]
] | [
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] |
711.203 | Bernhard Urbaszek | Thierry Amand, Xavier Marie | Exciton Spin Dynamics in Semiconductor Quantum Wells | 55 pages, 27 figures | null | 10.1007/978-3-540-78820-1_3 | null | cond-mat.other | null | In this paper we will review Exciton Spin Dynamics in Semiconductor Quantum
Wells. The spin properties of excitons in nanostructures are determined by
their fine structure. We will mainly focus in this review on GaAs and InGaAs
quantum wells which are model systems.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 16:26:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Amand",
"Thierry",
""
],
[
"Marie",
"Xavier",
""
]
] | [
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] |
711.2031 | Artur Ankowski | Artur M. Ankowski, Jan T. Sobczyk | Construction of spectral functions for medium nuclei | 16 pages, 16 figures, 4 tables; real part of the optical potential
included in description of final-state interactions | Phys.Rev.C77:044311,2008 | 10.1103/PhysRevC.77.044311 | null | nucl-th | null | This article is aimed at improving the description of lepton-nucleus
interactions in the sub-GeV energy range. Approximate spectral functions for
oxygen, calcium, and argon are constructed and used to obtain the electron
cross sections in a given scattering angle. Comparison with a sample of
available experimental data shows satisfactory agreement. Discrepancy between
the presented model and the systematic computations available for oxygen [O.
Benhar et al., Phys. Rev. D 72, 053005 (2005)] is also found to be very small.
Analysis of appropriate kinematical regions leads to the conclusion that the
obtained argon spectral function should describe well neutrino scattering in
the 800-MeV energy region. Several approximations used in the model are
critically reviewed. All the details needed to implement the presented approach
in Monte Carlo simulations are given.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:02:30 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Apr 2008 09:21:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ankowski",
"Artur M.",
""
],
[
"Sobczyk",
"Jan T.",
""
]
] | [
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] |
711.2032 | Vern Paulsen | Kenneth R. Davidson, Vern I. Paulsen, Mrinal Raghupathi, Dinesh Singh | A Constrained Nevanlinna-Pick Interpolation Problem | null | null | null | null | math.OA | null | We obtain necessary and sufficient conditions for Nevanlinna-Pick
interpolation on the unit disk with the additional restriction that all
analytic interpolating functions satisfy $f'(0)=0.$ Alternatively, these
results can be interpreted as interpolation results for $H^{\infty}(V),$ where
$V$ is the intersection of the bidisk with an algebraic variety. We use an
analysis of C*-envelopes to show that these same conditions do not suffice for
matrix interpolation.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:04:25 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Davidson",
"Kenneth R.",
""
],
[
"Paulsen",
"Vern I.",
""
],
[
"Raghupathi",
"Mrinal",
""
],
[
"Singh",
"Dinesh",
""
]
] | [
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] |
711.2033 | David Delphenich | David Delphenich | Transverse geometry and physical observers | 23 pages, no figures | null | null | null | gr-qc | null | It is proposed that the mathematical formalism that is most appropriate for
the study of spatially non-integrable cosmological models is the transverse
geometry of a one-dimensional foliation (congruence) defined by a physical
observer. By that means, one can discuss the geometry of space, as viewed by
that observer, without the necessity of introducing a complementary sub-bundle
to the line bundle of the observer or a codimension-one foliation transverse to
the foliation of the observer. The concept of groups of transverse isometries
acting on such a spacetime and the relationship of transverse geometry to
spacetime threadings (1+3 decompositions) is also discussed.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:16:11 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Delphenich",
"David",
""
]
] | [
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711.2034 | Adam D. Myers | Volodymyr V. Kindratenko (UIUC and NCSA), Robert J. Brunner (UIUC and
NCSA), Adam D. Myers (UIUC) | Dynamic load-balancing on multi-FPGA systems: a case study | On speeding up 2PCF calculations using field-programmable gate
arrays, appeared in Proc. 3rd Annual Reconfigurable Systems Summer Institute
- RSSI'07, 2007, 8 pages | null | null | null | astro-ph | null | In this case study, we investigate the impact of workload balance on the
performance of multi-FPGA codes. We start with an application in which two
distinct kernels run in parallel on two SRC-6 MAP processors. We observe that
one of the MAP processors is idle 18% of the time while the other processor is
fully utilized. We investigate a task redistribution schema which serializes
the execution of the two kernels, yet parallelizes execution of each individual
kernel by spreading the workload between two MAP processors. This
implementation results in a near 100% utilization of both MAP processors and
the overall application performance is improved by 9%.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:16:13 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Kindratenko",
"Volodymyr V.",
"",
"UIUC and NCSA"
],
[
"Brunner",
"Robert J.",
"",
"UIUC and\n NCSA"
],
[
"Myers",
"Adam D.",
"",
"UIUC"
]
] | [
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711.2035 | Teake Nutma | Eric Bergshoeff, Joaquim Gomis, Teake Nutma, Diederik Roest | Kac-Moody Spectrum of (Half-)Maximal Supergravities | Added references, published version | JHEP0802:069,2008 | 10.1088/1126-6708/2008/02/069 | UG-07-06, UB-ECM-PF-07/24, CERN-PH-TH/2007-165 | hep-th | null | We establish the correspondence between, on one side, the possible gaugings
and massive deformations of half-maximal supergravity coupled to vector
multiplets and, on the other side, certain generators of the associated very
extended Kac-Moody algebras. The difference between generators associated to
gaugings and to massive deformations is pointed out. Furthermore, we argue that
another set of generators are related to the so-called quadratic constraints of
the embedding tensor. Special emphasis is placed on a truncation of the
Kac-Moody algebra that is related to the bosonic gauge transformations of
supergravity. We give a separate discussion of this truncation when non-zero
deformations are present. The new insights are also illustrated in the context
of maximal supergravity.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:20:46 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 10:35:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bergshoeff",
"Eric",
""
],
[
"Gomis",
"Joaquim",
""
],
[
"Nutma",
"Teake",
""
],
[
"Roest",
"Diederik",
""
]
] | [
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] |
711.2036 | Matilde Marcolli | Matilde Marcolli (MPI) | Solvmanifolds and noncommutative tori with real multiplication | 40 pages, LaTeX | null | null | null | math.QA | null | We prove that the Shimizu L-function of a real quadratic field is obtained
from a (Lorentzian) spectral triple on a noncommutative torus with real
multiplication, as an adiabatic limit of the Dirac operator on a 3-dimensional
solvmanifold. The Dirac operator on this 3-dimensional geometry gives, via the
Connes-Landi isospectral deformations, a spectral triple for the noncommutative
tori obtained by deforming the fiber tori to noncommutative spaces. The
3-dimensional solvmanifold is the homotopy quotient in the sense of
Baum--Connes of the noncommutative space obtained as the crossed product of the
noncommutative torus by the action of the units of the real quadratic field.
This noncommutative space is identified with the twisted group C*-algebra of
the fundamental group of the 3-manifold. The twisting can be interpreted as the
cocycle arising from a magnetic field, as in the theory of the quantum Hall
effect. We prove a twisted index theorem that computes the range of the trace
on the K-theory of this noncommutative space and gives an estimate on the gaps
in the spectrum of the associated Harper operator.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:21:12 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Marcolli",
"Matilde",
"",
"MPI"
]
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711.2037 | Thomas Dean | Thomas Dean and Paul Dupuis | Splitting for Rare Event Simulation: A Large Deviation Approach to
Design and Analysis | Submitted to Stochastic Processes and their Applications | null | null | null | math.PR | null | Particle splitting methods are considered for the estimation of rare events.
The probability of interest is that a Markov process first enters a set $B$
before another set $A$, and it is assumed that this probability satisfies a
large deviation scaling. A notion of subsolution is defined for the related
calculus of variations problem, and two main results are proved under mild
conditions. The first is that the number of particles generated by the
algorithm grows subexponentially if and only if a certain scalar multiple of
the importance function is a subsolution. The second is that, under the same
condition, the variance of the algorithm is characterized (asymptotically) in
terms of the subsolution. The design of asymptotically optimal schemes is
discussed, and numerical examples are presented.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:27:10 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Dean",
"Thomas",
""
],
[
"Dupuis",
"Paul",
""
]
] | [
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711.2038 | Brett D. Altschul | Brett Altschul | Astrophysical Bounds on the Photon Charge and Magnetic Moment | 17 pages | Astropart.Phys.29:290-298,2008 | 10.1016/j.astropartphys.2008.02.006 | null | hep-th | null | If the photon possessed an electric charge or a magnetic moment, light waves
propagating through magnetic fields would acquire new quantum mechanical
phases. For a charged photon, this is an Aharonov-Bohm phase, and the fact that
we can resolve distant galaxies using radio interferometry indicates that this
phase must be small. This in turn constrains the photon charge to be smaller
that 10^(-32) e if all photons have the same charge and smaller than 10^(-46) e
if there are both positively and negatively charged photons. The best bound on
the magnetic moment comes from the observed absence of wavelength-independent
photon birefringence. Birefringence measurements, which compare the relative
phases of right- and left-circularly polarized waves, restrict the magnetic
moment to be less than 10^(-24) e cm. This is just a few orders of magnetude
weaker than the experimental bounds on the electron and neutron electric dipole
moments.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:31:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Altschul",
"Brett",
""
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] |
711.2039 | Agnes Kim | A. Bischoff-Kim, M.H. Montgomery, D.E. Winget | Fine Grid Asteroseismology of R548 and G117-B15A | The first author would love to hear from you if you found this paper
interesting. email [email protected] | null | 10.1086/527287 | null | astro-ph | null | We now have a good measurement of the cooling rate of G117-B15A. In the near
future, we will have equally well determined cooling rates for other pulsating
white dwarfs, including R548. The ability to measure their cooling rates offers
us a unique way to study weakly interacting particles that would contribute to
their cooling. Working toward that goal, we perform a careful
asteroseismological analysis of G117-B15A and R548. We study them side by side
because they have similar observed properties. We carry out a systematic, fine
grid search for best fit models to the observed period spectra of those stars.
We freely vary 4 parameters: the effective temperature, the stellar mass, the
helium layer mass, and the hydrogen layer mass. We identify and quantify a
number of uncertainties associated with our models. Based on the results of
that analysis and fits to the periods observed in R548 and G117-B15A, we
clearly define the regions of the 4 dimensional parameter space ocuppied by the
best fit models.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:32:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bischoff-Kim",
"A.",
""
],
[
"Montgomery",
"M. H.",
""
],
[
"Winget",
"D. E.",
""
]
] | [
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] |
711.204 | Alexey Yamilov | Alexey G. Yamilov, Mark R. Herrera and Massimo F. Bertino | Slow-light effect in dual-periodic photonic lattice | 10 pages, 6 figures | null | 10.1364/JOSAB.25.000599 | null | physics.optics | null | We present analytical and numerical study of photonic lattice with short- and
long-range harmonic modulations of the refractive index. Such structures can be
prepared experimentally with holographic photolithography. In the spectral
region of photonic bandgap of the underlying single-periodic crystal, we
observe a series of bands with anomalously small dispersion. The related
slow-light effect is attributed to the long-range modulation in the photonic
lattice, that leads to formation of an array of evanescently-coupled high-$Q$
cavities. The band structure of the lattice is studied with several techniques:
(i) transfer matrix approach; (ii) analysis of resonant coupling in process of
band folding; (iii) effective medium approach based on coupled-mode theory; and
(iv) Bogolyubov-Mitropolsky approach. The latter method, commonly used in the
studies of nonlinear oscillators, was employed to investigate the behavior of
the eigen-function envelopes and the band structure of our dual-periodic
photonic lattice. We show that reliable results can be obtained even in the
case of large refractive index modulation.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 20:51:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yamilov",
"Alexey G.",
""
],
[
"Herrera",
"Mark R.",
""
],
[
"Bertino",
"Massimo F.",
""
]
] | [
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] |
711.2041 | Agnes Kim | A. Bischoff-Kim, M.H. Montgomery, D.E. Winget | Strong limits on the DFSZ axion mass with G117-B15A | The first author would love to hear from you if you found this paper
interesting. email [email protected] | null | 10.1086/526398 | null | astro-ph | null | We compute rates of period change (Pdots) for the 215s mode in G117-B15A and
the 213s mode in R548, first for models without axions, and then for models
with axions of increasing mass. We use the asteroseismological models for
G117-B15A and R548 we derived in an earlier publication . For G117-B15A, we
consider two families of solutions, one with relatively thick hydrogen layers
and one with thin hydrogen layers. Given the region of parameter space occupied
by our models, we estimate error bars on the calculated Pdots using Monte Carlo
simulations. Together with the observed Pdot for G117-B15A, our analysis yields
strong limits on the DFSZ axion mass. Our thin hydrogen solutions place an
upper limit of 13.5 meV on the axion, while our thick hydrogen solutions
relaxes that limit to 26.5 meV.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:52:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bischoff-Kim",
"A.",
""
],
[
"Montgomery",
"M. H.",
""
],
[
"Winget",
"D. E.",
""
]
] | [
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] |
711.2042 | Eckhard Sutorius | Eckhard Sutorius (1), Johann Bryant (1), Ross Collins (1), Nicholas
Cross (1), Nigel Hambly (1), Mike Read (1) ((1) Scottish Universities Physics
Alliance (SUPA), Institute for Astronomy, School of Physics, University of
Edinburgh, UK) | A pseudo-parallel Python environment for database curation | 4 pages, 2 figures, ADASS XVII conference proceeding. ASP conference
series | null | null | null | astro-ph | null | One of the major challenges providing large databases like the WFCAM Science
Archive (WSA) is to minimize ingest times for pixel/image metadata and
catalogue data. In this article we describe how the pipeline processed data are
ingested into the database as the first stage in building a release database
which will be succeeded by advanced processing (source merging, seaming,
detection quality flagging etc.). To accomplish the ingestion procedure as fast
as possible we use a mixed Python/C++ environment and run the required tasks in
a simple parallel modus operandi where the data are split into daily chunks and
then processed on different computers. The created data files can be ingested
into the database immediately as they are available. This flexible way of
handling the data allows the most usage of the available CPUs as the comparison
with sequential processing shows.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 18:22:18 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Sutorius",
"Eckhard",
""
],
[
"Bryant",
"Johann",
""
],
[
"Collins",
"Ross",
""
],
[
"Cross",
"Nicholas",
""
],
[
"Hambly",
"Nigel",
""
],
[
"Read",
"Mike",
""
]
] | [
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] |
711.2043 | Yvette Kosmann-Schwarzbach | Yvette Kosmann-Schwarzbach | Poisson and symplectic functions in Lie algebroid theory | Dedicated to Murray Gerstenhaber and Jim Stasheff, 27 pages, to
appear in Progress in Math.; editorial changes, one reference added; v4:
change of convention for bidegree | Higher Structures in Geometry and Physics, Cattaneo, Giaquinto and
P. Xu, eds., 2011, 243-268 | null | null | math.SG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Emphasizing the role of Gerstenhaber algebras and of higher derived brackets
in the theory of Lie algebroids, we show that the several Lie algebroid
brackets which have been introduced in the recent literature can all be defined
in terms of Poisson and pre-symplectic functions in the sense of Roytenberg and
Terashima. We prove that in this very general framework there exists a
one-to-one correspondence between non-degenerate Poisson functions and
symplectic functions. We determine the differential associated to a Lie
algebroid structure obtained by twisting a structure with background by both a
Lie bialgebra action and a Poisson bivector.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 17:56:53 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Apr 2008 14:45:56 GMT"
},
{
"version": "v3",
"created": "Sun, 29 Jun 2008 21:35:00 GMT"
},
{
"version": "v4",
"created": "Sun, 28 Dec 2008 19:44:40 GMT"
}
] | 2012-12-05T00:00:00 | [
[
"Kosmann-Schwarzbach",
"Yvette",
""
]
] | [
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] |
711.2044 | Maria Vittoria Garzelli | G. Battistoni, F. Cerutti, A. Fass\`o, A. Ferrari, M.V. Garzelli, M.
Lantz, S. Muraro, L.S. Pinsky, J. Ranft, S. Roesler, P.R. Sala | Secondary Cosmic Ray particles due to GCR interactions in the Earth's
atmosphere | 7 pages, 3 figures. Proceedings of an invited talk presented by M.V.
Garzelli at CSSP07, Carpathian Summer School of Physics - Exotic Nuclei &
Nuclear/Particle Astrophysics, Sinaia, Romania, August 20 - 31 2007 | AIP Conf.Proc.972:449-454,2008 | 10.1063/1.2870386 | null | astro-ph | null | Primary GCR interact with the Earth's atmosphere originating atmospheric
showers, thus giving rise to fluxes of secondary particles in the atmosphere.
Electromagnetic and hadronic interactions interplay in the production of these
particles, whose detection is performed by means of complementary techniques in
different energy ranges and at different depths in the atmosphere, down to the
Earth's surface.
Monte Carlo codes are essential calculation tools which can describe the
complexity of the physics of these phenomena, thus allowing the analysis of
experimental data. However, these codes are affected by important
uncertainties, concerning, in particular, hadronic physics at high energy. In
this paper we shall report some results concerning inclusive particle fluxes
and atmospheric shower properties as obtained using the FLUKA transport and
interaction code. Some emphasis will also be given to the validation of the
physics models of FLUKA involved in these calculations.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 18:30:24 GMT"
}
] | 2009-07-14T00:00:00 | [
[
"Battistoni",
"G.",
""
],
[
"Cerutti",
"F.",
""
],
[
"Fassò",
"A.",
""
],
[
"Ferrari",
"A.",
""
],
[
"Garzelli",
"M. V.",
""
],
[
"Lantz",
"M.",
""
],
[
"Muraro",
"S.",
""
],
[
"Pinsky",
"L. S.",
""
],
[
"Ranft",
"J.",
""
],
[
"Roesler",
"S.",
""
],
[
"Sala",
"P. R.",
""
]
] | [
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] |
711.2045 | Paulina Lira | P.Lira (UChile), V.Gonzalez-Corvalan (UChile/USCS), M.Ward (Durham),
S.Hoyer (UChile) | An infrared study of the double nucleus in NGC3256 | Accepted for publication (MNRAS) | null | 10.1111/j.1365-2966.2007.12705.x | null | astro-ph | null | We present new resolved near and mid-IR imaging and N-band spectroscopy of
the two nuclei in the merger system NGCA3256, the most IR luminous galaxy in
the nearby universe. The results from the SED fit to the data are consistent
with previous estimates of the amount of obscuration towards the nuclei and the
nuclear star formation rates. However, we also find substantial differences in
the infrared emission from the two nuclei which cannot be explained by
obscuration alone. We conclude that the northern nucleus requires an additional
component of warm dust in order to explain its properties. This suggests that
local starforming conditions can vary significantly within the environment of a
single system.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 18:41:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lira",
"P.",
"",
"UChile"
],
[
"Gonzalez-Corvalan",
"V.",
"",
"UChile/USCS"
],
[
"Ward",
"M.",
"",
"Durham"
],
[
"Hoyer",
"S.",
"",
"UChile"
]
] | [
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] |
711.2046 | Kaushik Bhattacharya | Alberto Bravo Garcia, Kaushik Bhattacharya, Sarira Sahu | Neutrino self-energy in a magnetized charge-symmetric medium | 6 pages, 1 figure. To appear in the conference proceedings of the XI
Mexican workshop on particles and fields 2007 | AIPConf.Proc.1026:121-126,2008 | 10.1063/1.2965033 | null | hep-ph | null | In this talk we present the calculation of the neutrino self-energy in
presence of a magnetized medium. The magnetized medium consists of electrons,
positrons, neutrinos and a uniform classical magnetic field. The background
magnetic field is assumed to be weak compared to the $W$-Boson mass as a
consequence of which only linear order corrections in the field are included in
the $W$ boson propagator. The electron propagator consists all order
corrections in the background field. Our calculation is specifically suited for
situations where the background plasma may be CP symmetric.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 18:43:10 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2007 20:07:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Garcia",
"Alberto Bravo",
""
],
[
"Bhattacharya",
"Kaushik",
""
],
[
"Sahu",
"Sarira",
""
]
] | [
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] |
711.2047 | Arafat Gabareen Mokhtar | The BABAR Collaboration: B. Aubert, et al | Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR | Published: Phys. Rev. Lett. 101, 082001 (2008) | Phys.Rev.Lett.101:082001,2008 | 10.1103/PhysRevLett.101.082001 | null | hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of the decays $B^{0,+}\to J/\psi\omega K^{0,+}$ using
$383\times 10^{6}$ $B\bar{B}$ events obtained with the \babar detector at
PEP-II. We observe $Y(3940) \to J/\psi \omega$, with mass $3914.6
^{+3.8}_{-3.4} (stat) \pm{2.0} (syst)$ \mevcc, and width
$34^{+12}_{-8}(stat)\pm{5}(syst)$ \mev. The ratio of $B^0$ and $B^+$ decay to
$YK$ is $0.27^{+0.28}_{-0.23}(stat)^{+0.04}_{-0.01}(syst)$, and the relevant
$B^0$ and $B^+$ branching fractions are reported.
| [
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711.2048 | David Richards | David Richards | Nucleon Structure from Lattice QCD | 6 pages, invited plenary talk at NSTAR 2007, 5-8 September 2007,
Bonn, Germany | null | 10.1007/978-3-540-85144-8_8 | JLAB-THY-07-748 | nucl-th hep-lat | null | Recent advances in lattice field theory, in computer technology and in chiral
perturbation theory have enabled lattice QCD to emerge as a powerful
quantitative tool in understanding hadron structure. I describe recent progress
in the computation of the nucleon form factors and moments of parton
distribution functions, before proceeding to describe lattice studies of the
Generalized Parton Distributions (GPDs). In particular, I show how lattice
studies of GPDs contribute to building a three-dimensional picture of the
proton. I conclude by describing the prospects for studying the structure of
resonances from lattice QCD.
| [
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] | 2015-05-13T00:00:00 | [
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711.2049 | Denis Gonta | D. Gonta, and S. Fritzsche | The role of the atom-cavity detuning in bimodal cavity experiments | IOP file, 6 figures, J. Phys. B accepted | J. Phys. B: At. Mol. Opt. Phys. 41 (2008) 095503. | 10.1088/0953-4075/41/9/095503 | null | quant-ph | null | The coherent evolution of the atom-cavity state in bimodal (cavity)
experiments has been analyzed for a realistic time-dependence in detuning the
atomic transition frequency. Apart from a `smooth switch' of the atomic
resonance from one to the second mode of a bimodal cavity, we considered also
an additional (effective) interaction between the field modes of the cavity,
known as `communication channel'. Comparison of our model computations has been
made especially with the measurements by Rauschenbeutel et al., [2001 Phys.
Rev. A 64 050301] who demonstrated for the first time the entanglement of the
field modes in a bimodal cavity. It is shown that the agreement between the
(theoretically) predicted and experimental phase shifts can be improved by
allowing a `communication' between the two field modes during a short but
finite switch of the atomic transition frequency from one mode to the other. We
therefore suggest that the details of the atom-cavity detuning should be taken
into account for the future interpretation of bimodal cavity experiments.
| [
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] | 2009-11-13T00:00:00 | [
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""
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] |
711.205 | Hacene Belbachir | Kenza Guenda | Two Families of Quantum Codes Derived from Cyclic Codes | null | null | null | null | cs.IT math.IT | null | We characterize the affine-invariant maximal extended cyclic codes. Then by
the CSS construction, we derive from these codes a family of pure quantum
codes. Also for ordnq even, a new family of degenerate quantum stabilizer codes
is derived from the classical duadic codes. This answer an open problem asked
by Aly et al.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:06:43 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Guenda",
"Kenza",
""
]
] | [
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] |
711.2051 | S. M. Iftiquar | S. M. Iftiquar | Comment on`` Angular dependence of Dicke-narrowed electromagnetically
induced transparency resonances'' | 1 page, no figure, | null | null | null | physics.optics physics.atom-ph | null | We demonstrate that the experimental results reported by M. Shuker, O.
Firstenberg, R. Pugatch, A. Ben-Kish,1 A. Ron, and N. Davidson, Phys. Rev. A
{\bf 76}, 023813 (2007) as Dicke narrowing of electromagnetically induced
transparency, does not match with theory.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:55:32 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Iftiquar",
"S. M.",
""
]
] | [
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711.2052 | Alejandro Rodriguez | Alejandro W. Rodriguez, Alexander P. McCauley, Yehuda Avniel, and
Steven G. Johnson | Computation and visualization of photonic quasicrystal spectra via
Blochs theorem | Published in Physical Review B, 77 104201, 2008 | Physical Review B, 77 104201, 2008 | 10.1103/PhysRevB.77.104201 | null | physics.optics | null | Previous methods for determining photonic quasicrystal (PQC) spectra have
relied on the use of large supercells to compute the eigenfrequencies and/or
local density of states (LDOS). In this manuscript, we present a method by
which the energy spectrum and the eigenstates of a PQC can be obtained by
solving Maxwells equations in higher dimensions for any PQC defined by the
standard cut-and-project construction, to which a generalization of Blochs
theorem applies. In addition, we demonstrate how one can compute band
structures with defect states in the higher-dimensional superspace with no
additional computational cost. As a proof of concept, these general ideas are
demonstrated for the simple case of one-dimensional quasicrystals, which can
also be solved by simple transfer-matrix techniques.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:17:27 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 21:55:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rodriguez",
"Alejandro W.",
""
],
[
"McCauley",
"Alexander P.",
""
],
[
"Avniel",
"Yehuda",
""
],
[
"Johnson",
"Steven G.",
""
]
] | [
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] |
711.2053 | Federico Marulli | Federico Marulli, Silvia Bonoli, Enzo Branchini, Lauro Moscardini,
Volker Springel | Modeling the cosmological co-evolution of supermassive black holes and
galaxies: I. BH scaling relations and the AGN luminosity function | 15 pages, 7 figures, MNRAS submitted | null | 10.1111/j.1365-2966.2008.12988.x | null | astro-ph | null | We model the cosmological co-evolution of galaxies and their central
supermassive black holes (BHs) within a semi-analytical framework developed on
the outputs of the Millennium Simulation. This model, described in detail in
Croton et al. (2006) and De Lucia & Blaizot (2007), introduces a `radio mode'
feedback from Active Galactic Nuclei (AGN) at the centre of X-ray emitting
atmospheres in galaxy groups and clusters. Thanks to this mechanism, the model
can simultaneously explain: (i) the low observed mass drop-out rate in cooling
flows; (ii) the exponential cut-off in the bright end of the galaxy luminosity
function; and (iii) the bulge-dominated morphologies and old stellar ages of
the most massive galaxies in clusters. This paper is the first of a series in
which we investigate how well this model can also reproduce the physical
properties of BHs and AGN. Here we analyze the scaling relations, the
fundamental plane and the mass function of BHs, and compare them with the most
recent observational data. Moreover, we extend the semi-analytic model to
follow the evolution of the BH mass accretion and its conversion into
radiation, and compare the derived AGN bolometric luminosity function with the
observed one. While we find for the most part a very good agreement between
predicted and observed BH properties, the semi-analytic model underestimates
the number density of luminous AGN at high redshifts, independently of the
adopted Eddington factor and accretion efficiency. However, an agreement with
the observations is possible within the framework of our model, provided it is
assumed that the cold gas fraction accreted by BHs at high redshifts is larger
than at low redshifts.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:20:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marulli",
"Federico",
""
],
[
"Bonoli",
"Silvia",
""
],
[
"Branchini",
"Enzo",
""
],
[
"Moscardini",
"Lauro",
""
],
[
"Springel",
"Volker",
""
]
] | [
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] |
711.2054 | Horst Winkelnkemper E. | H. E. Winkelnkemper | AP Theory II:Intrinsic 4D Quantum YM Theory with Mass Gap | 14 pages. See also http://www.math.umd.edu/~hew | null | null | null | math.GM | null | We describe a sub-theory of Artin Presentation Theory (AP Theory), which has
many genuine,discrete,group-theoretic,non-infinitesimal, qualitative analogues
(including with the mass gap) of the main desiderata of the hypothetical
quantitative infinitesimal '4D Quantum YM Theory' for the so-called Clay
Millenium 'YM Existence and Mass Gap' problem. Our entirely mathematically
rigorous theory is not a model, no new axioms or measures are introduced,does
not rely on SUSY,is free of smooth 4D singularities,moduli spaces,path
integrals, graph/lattice combinatorics and probabilistic,category,twistor or
topos arguments and is intimately related to the theory of pure framed braids.
Despite being based on a rigorous, radical,universal Holographic Principle,the
theory still contains an analogue of Donaldson/Seiberg-Witten Theory, an
infinitely generated, at each stage, graded group of topology-changing
transitions and interactions and more. Our main contention is: the
radical,universal AP-holography, with its strong topology changing
interactions, which reach all the way to the 'vacuum' of discrete group theory,
may destroy any infinitesimal, PDE based Field Theory,required for solving the
actual Clay YM problem in its present quantitative form as a problem of
so-called 'constructive' 3+1 QFT. More generally,due to the fact that AP Theory
is not a model,e.g., does not introduce any new axioms,any rigorous axiomatic
3+1 QFT has to align itself with it in a mathematically rigorous fashion.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:31:54 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 16:19:36 GMT"
}
] | 2010-10-25T00:00:00 | [
[
"Winkelnkemper",
"H. E.",
""
]
] | [
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] |
711.2055 | Ronald Snell | J. Franklin, R. L. Snell, M. J. Kaufman, G. J. Melnick, D. A. Neufeld,
D. J. Hollenbach, and E. A. Bergin | SWAS Observations of Water in Molecular Outflows | Accepted for publication in Ap.J., 51 pages including 4 pages of
figures | null | 10.1086/524924 | null | astro-ph | null | We present SWAS detections of the ground-state 1(10)-1(01) transition of
o-H2O at 557 GHz in 18 molecular outflows. These results are combined with
ground-based observations of the J=1-0 transitions of 12CO and 13CO obtained at
the FCRAO and, for a subset of the outflows, data from ISO. Assuming the SWAS
water line emission originates from the same gas traced by CO emission, we find
that the outflowing gas in most outflows has an o-H2O abundance relative to H2
of between 10(-7) and 10(-6). Analysis of the water abundance as a function of
outflow velocity reveals a strong dependence. The water abundance increases
with velocity, and at the highest outflow velocities some outflows have
relative o-H2O abundances of order 10(-4). However the mass of gas with such
elevated water abundances represents less that 1% of the total outflow gas
mass. The ISO LWS observations of high-J rotational lines of CO and the 179.5
micron transition of o-H2O provide evidence for a warmer outflow component than
required to produce either the SWAS or FCRAO lines. The mass associated with
the ISO emission is similar to that responsible for the highest velocity water
emission detected by SWAS. The bulk of the outflowing gas has an abundance of
o-H2O well below what would be expected if the gas has passed through a C-shock
with shock velocities greater than 10 km/s. Gas-phase water can be depleted in
the post-shock gas due to freeze-out onto grain mantles, however the rate of
freeze-out is too slow to explain our results. Therefore we believe that only a
small fraction of the outflowing molecular gas has passed through shocks strong
enough to fully convert the gas-phase oxygen to water. This result has
implications for the acceleration mechanism of the molecular gas in these
outflows.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:49:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Franklin",
"J.",
""
],
[
"Snell",
"R. L.",
""
],
[
"Kaufman",
"M. J.",
""
],
[
"Melnick",
"G. J.",
""
],
[
"Neufeld",
"D. A.",
""
],
[
"Hollenbach",
"D. J.",
""
],
[
"Bergin",
"E. A.",
""
]
] | [
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] |
711.2056 | Sharon Toolan | Howard E. Bond (Space Telescope Science Institute) | Transient Mass-Loss Events in the PG 1159 Central Star of Longmore 4 | 4 pages, 2 figures; to appear in the proceedings of the Conference on
Hydrogen-Deficient Stars, held in Tuebingen, Germany, Sept 17-21, 2007 | null | null | STScI E-print #1786 | astro-ph | null | A spectacular, transient mass-loss event in the hydrogen-deficient central
star of the planetary nebula Longmore 4 was discovered in 1992 by Werner et al.
During that event, the star temporarily changed from its normal PG 1159
spectrum to that of an emission-line [WCE] star. I have been monitoring the
spectrum of Lo 4 since 2003. Out of 31 spectra, two of them reveal mass-loss
outbursts similar to the one seen in 1992, showing that the phenomenon recurs.
I speculate on possible mechanisms for these unique outbursts, but emphasize
that we still have no fully convincing explanation.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:53:16 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Bond",
"Howard E.",
"",
"Space Telescope Science Institute"
]
] | [
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] |
711.2057 | Volker Runde | Matthias Neufang, Volker Runde | Column and row operator spaces over QSL_p-spaces and their use in
abstract harmonic analysis | 21 pages; some nip 'n tuck | J. Math. Anal. Appl. 349 (2009), 21-29 | null | null | math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notions of column and row operator space were extended by A. Lambert from
Hilbert spaces to general Banach spaces. In this paper, we use column and row
spaces over quotients of subspaces of general $L_p$-spaces to equip several
Banach algebras occurring naturally in abstract harmonic analysis with
canonical, yet not obvious operator space structures that turn them into
completely bounded Banach algebras. We use these operator space structures to
gain new insights on those algebras.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:55:12 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Aug 2008 18:03:07 GMT"
},
{
"version": "v3",
"created": "Sun, 31 Aug 2008 02:00:20 GMT"
}
] | 2008-11-23T00:00:00 | [
[
"Neufang",
"Matthias",
""
],
[
"Runde",
"Volker",
""
]
] | [
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] |
711.2058 | Igor M. Suslov | I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow,
Russia) | Computer Model of a "Sense of Humour". I. General Algorithm | 10 pages, 3 figures included; continuation of this series to appear | Biofizika SSSR 37, 318 (1992) [Biophysics 37, 242 (1992)] | null | null | q-bio.NC cs.AI | null | A computer model of a "sense of humour" is proposed. The humorous effect is
interpreted as a specific malfunction in the course of information processing
due to the need for the rapid deletion of the false version transmitted into
consciousness. The biological function of a sense of humour consists in
speeding up the bringing of information into consciousness and in fuller use of
the resources of the brain.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 19:00:32 GMT"
}
] | 2007-11-27T00:00:00 | [
[
"Suslov",
"I. M.",
"",
"P.L.Kapitza Institute for Physical Problems, Moscow,\n Russia"
]
] | [
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] |
711.2059 | Moshe Moshe | Kirone Mallick, Moshe Moshe, Henri Orland | Supersymmetry and Nonequilibrium Work Relations | minor changes prior to submission for publication, references added | null | null | null | cond-mat.stat-mech | null | We give a field-theoretic proof of the nonequilibrium work relations for a
space dependent field with stochastic dynamics. The path integral
representation and its symmetries allow us to derive Jarzynski's equality. In
addition, we derive a set of exact identities that generalize the
fluctuation-dissipation relations to far-from equilibrium situations. These
identities are prone to experimental verification. Furthermore, we show that
supersymmetry invariance of the Langevin equation, which is broken when the
external potential is time-dependent, is partially restored by adding to the
action a term which is precisely Jarzynski's work. Jarzynski's equality can
also be deduced from this supersymmetry
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 20:08:11 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Feb 2008 01:17:53 GMT"
}
] | 2008-02-01T00:00:00 | [
[
"Mallick",
"Kirone",
""
],
[
"Moshe",
"Moshe",
""
],
[
"Orland",
"Henri",
""
]
] | [
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] |
711.206 | Gang Cao | G. Cao, V. Durairaj, S. Chikara, L.E. DeLong, and P. Schlottmann | Ca3(Ru1-xCrx)2O7: A new paradigm for spin valves | 5 figures. to be published in Physical Review Letters | null | 10.1142/S0217984908016480 | null | cond-mat.str-el | null | The spin valve effect is a quantum phenomenon so far only realized in
multilayer thin films or heterostructures. Here we report a strong spin valve
effect existing in bulk single crystals of Ca3(Ru1-xCrx)2O7 having an
anisotropic, bilayered crystal structure. This discovery opens new avenues to
understand the underlying physics of spin valves, and fully realize its
potential in practical devices.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 20:14:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cao",
"G.",
""
],
[
"Durairaj",
"V.",
""
],
[
"Chikara",
"S.",
""
],
[
"DeLong",
"L. E.",
""
],
[
"Schlottmann",
"P.",
""
]
] | [
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] |
711.2061 | Igor M. Suslov | I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow,
Russia) | Computer Model of a "Sense of Humour". II. Realization in Neural
Networks | 13 pages, 5 figures included; continuation of this series to appear | Biofizika SSSR 37, 325 (1992) [Biophysics 37, 249 (1992)] | null | null | q-bio.NC cs.AI | null | The computer realization of a "sense of humour" requires the creation of an
algorithm for solving the "linguistic problem", i.e. the problem of recognizing
a continuous sequence of polysemantic images. Such algorithm may be realized in
the Hopfield model of a neural network after its proper modification.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 20:15:10 GMT"
}
] | 2007-11-27T00:00:00 | [
[
"Suslov",
"I. M.",
"",
"P.L.Kapitza Institute for Physical Problems, Moscow,\n Russia"
]
] | [
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] |
711.2062 | Thomas Sandholm | Thomas Sandholm | Autoregressive Time Series Forecasting of Computational Demand | null | null | null | null | cs.DC | null | We study the predictive power of autoregressive moving average models when
forecasting demand in two shared computational networks, PlanetLab and Tycoon.
Demand in these networks is very volatile, and predictive techniques to plan
usage in advance can improve the performance obtained drastically.
Our key finding is that a random walk predictor performs best for
one-step-ahead forecasts, whereas ARIMA(1,1,0) and adaptive exponential
smoothing models perform better for two and three-step-ahead forecasts. A Monte
Carlo bootstrap test is proposed to evaluate the continuous prediction
performance of different models with arbitrary confidence and statistical
significance levels. Although the prediction results differ between the Tycoon
and PlanetLab networks, we observe very similar overall statistical properties,
such as volatility dynamics.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 00:57:13 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Sandholm",
"Thomas",
""
]
] | [
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] |
711.2063 | James Rossmanith | James A. Rossmanith | A class of residual distribution schemes and their relation to
relaxation systems | 46 pages, 14 figures | null | 10.1016/j.jcp.2008.07.007 | null | math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Residual distributions (RD) schemes are a class of of high-resolution finite
volume methods for unstructured grids. A key feature of these schemes is that
they make use of genuinely multidimensional (approximate) Riemann solvers as
opposed to the piecemeal 1D Riemann solvers usually employed by finite volume
methods. In 1D, LeVeque and Pelanti [J. Comp. Phys. 172, 572 (2001)] showed
that many of the standard approximate Riemann solver methods (e.g., the Roe
solver, HLL, Lax-Friedrichs) can be obtained from applying an exact Riemann
solver to relaxation systems of the type introduced by Jin and Xin [Comm. Pure
Appl. Math. 48, 235 (1995)]. In this work we extend LeVeque and Pelanti's
results and obtain a multidimensional relaxation system from which
multidimensional approximate Riemann solvers can be obtained. In particular, we
show that with one choice of parameters the relaxation system yields the
standard N-scheme. With another choice, the relaxation system yields a new
Riemann solver, which can be viewed as a genuinely multidimensional extension
of the local Lax-Friedrichs scheme. This new Riemann solver does not require
the use Roe-Struijs-Deconinck averages, nor does it require the inversion of an
m-by-m matrix in each computational grid cell, where $m$ is the number of
conserved variables. Once this new scheme is established, we apply it on a few
standard cases for the 2D compressible Euler equations of gas dynamics. We show
that through the use of linear-preserving limiters, the new approach produces
numerical solutions that are comparable in accuracy to the N-scheme, despite
being computationally less expensive.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:47:38 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Jul 2008 16:21:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rossmanith",
"James A.",
""
]
] | [
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-0.0745475069,
-0.0166790951,
0.0161479134,
0.0432836935,
-0.0416142642,
-0.0278794318,
0.0699945241,
-0.0746689215,
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] |
711.2064 | James Bolton | J.S. Bolton (MPA), M. Viel (INAF/INFN, Trieste), T.-S. Kim (Potsdam),
M.G. Haehnelt (IoA), R.F. Carswell (IoA) | Possible evidence for an inverted temperature-density relation in the
intergalactic medium from the flux distribution of the Lyman-alpha forest | 16 pages, 6 figures, accepted for publication in MNRAS following
minor revision. The accepted version includes an expanded discussion of the
flux power spectrum | Mon.Not.Roy.Astron.Soc. 386 (2008) 1131-1144 | 10.1111/j.1365-2966.2008.13114.x | null | astro-ph | null | We compare the improved measurement of the Lya forest flux probability
distribution at 1.7<z<3.2 presented by Kim et al. (2007) to a large set of
hydrodynamical simulations of the Lya forest with different cosmological
parameters and thermal histories. The simulations are in good agreement with
the observational data if the temperature-density relation for the low density
intergalactic medium (IGM), T=T_0 Delta^{gamma-1}, is either close to
isothermal or inverted (gamma<1). Our results suggest that the voids in the IGM
may be significantly hotter and the thermal state of the low density IGM may be
substantially more complex than is usually assumed at these redshifts. We
discuss radiative transfer effects which alter the spectral shape of ionising
radiation during the epoch of HeII reionisation as a possible physical
mechanism for achieving an inverted temperature-density relation at z~3.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 11:40:22 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 19:20:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bolton",
"J. S.",
"",
"MPA"
],
[
"Viel",
"M.",
"",
"INAF/INFN, Trieste"
],
[
"Kim",
"T. -S.",
"",
"Potsdam"
],
[
"Haehnelt",
"M. G.",
"",
"IoA"
],
[
"Carswell",
"R. F.",
"",
"IoA"
]
] | [
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] |
711.2065 | Xiangyu Wang | Xiang-Yu Wang, Soebur Razzaque and Peter Meszaros | On the Origin and Survival of UHE Cosmic-Ray Nuclei in GRBs and
Hypernovae | accepted by ApJ, references added, 12 pages, 4 figures, emulateapj
style | Astrophys.J.677:432-440,2008 | 10.1086/529018 | null | astro-ph hep-ph | null | The chemical composition of the ultra-high-energy (UHE) cosmic rays serves as
an important clue for their origin. Recent measurements of the elongation rates
by the Pierre Auger Observatory hint at the possible presence of heavy or
intermediate mass nuclei in the UHE cosmic rays. Gamma-ray bursts (GRBs) and
hypernovae have been suggested as possible sources of the UHE cosmic rays. Here
we derive the constraints on the physical conditions under which UHE heavy
nuclei, if they are accelerated in these sources, can survive in their intense
photon fields. We find that in the GRB external shock and in the hypernova
scenarios, UHE nuclei can easily survive photo-disintegration. In the GRB
internal shock scenario, UHE nuclei can also survive, provided the dissipation
radius and/or the bulk Lorentz factor of the relativistic outflow are
relatively large, or if the low-energy self-absorption break in the photon
spectrum of the prompt emission occurs above several KeV. In internal shocks
and in the other scenarios, intermediate-mass UHE nuclei have a higher
probability of survival against photo-disintegration than UHE heavy nuclei such
as Fe.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 19:38:38 GMT"
},
{
"version": "v2",
"created": "Sat, 22 Dec 2007 14:20:27 GMT"
},
{
"version": "v3",
"created": "Tue, 8 Jan 2008 01:38:53 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Wang",
"Xiang-Yu",
""
],
[
"Razzaque",
"Soebur",
""
],
[
"Meszaros",
"Peter",
""
]
] | [
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] |
711.2066 | Chris Fassnacht | C. D. Fassnacht (1), D. D. Kocevski (1), M. W. Auger (1), L. M. Lubin
(1), J. L. Neureuther (1), T. E. Jeltema (2), J. S. Mulchaey (3), J. P.
McKean (4) ((1) UC Davis, (2) UCO/Lick Observatories, (3) OCIW, (4) MPIfR,
Bonn) | The X-ray Properties of Moderate-redshift Galaxy Groups Selected by
Association with Gravitational Lenses | Accepted for publication in ApJ (July 10, 2008 issue). New smoothing
technique reveals that one system (B2108) has a multiple-peak brightness
distribution. Changed discussion and figures accordingly. Corrected some
values in Table 2 | null | 10.1086/588087 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results from a systematic investigation of the X-ray properties of
a sample of moderate redshift (0.3<z<0.6) galaxy groups. These groups were
selected not by traditional X-ray or optical search methods, but rather by an
association, either physical or along the line of sight, with a strong
gravitational lens. We calculate the properties of seven galaxy groups in the
fields of six lens systems. Diffuse X-ray emission from the intragroup medium
is detected in four of the groups. All of the detected groups have X-ray
luminosities greater than 10^{42} h^{-2} erg/s, and lie on the L_X-sigma_v
relations defined by local groups and clusters. The upper limits for the
non-detections are also consistent with the local L_X-sigma_v relationships.
Although the sample size is small and deeper optical and X-ray data are needed,
these results suggest that lens-selected groups are similar to X-ray selected
samples and, thus, are more massive than the typical poor-group environments of
local galaxies.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:00:25 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jun 2008 21:34:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fassnacht",
"C. D.",
""
],
[
"Kocevski",
"D. D.",
""
],
[
"Auger",
"M. W.",
""
],
[
"Lubin",
"L. M.",
""
],
[
"Neureuther",
"J. L.",
""
],
[
"Jeltema",
"T. E.",
""
],
[
"Mulchaey",
"J. S.",
""
],
[
"McKean",
"J. P.",
""
]
] | [
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] |
711.2067 | Gianluigi Catelani | G. Catelani, M. G. Vavilov | Effect of Coulomb interaction on current noise in open quantum dots | 4.5 pages, 2 figures | Phys. Rev. B 76, 201303(R) (2007) | 10.1103/PhysRevB.76.201303 | null | cond-mat.mes-hall | null | We analyze the effect of Coulomb interaction on the noise of electric current
through an open quantum dot. We demonstrate that the ensemble average value of
the noise power acquires an interaction correction even for a dot coupled to
the leads by reflectionless point contacts, when the ensemble average
conductance is known to have no interaction corrections. To leading order, the
correction to the noise originates from the formation of a nonequilibrium state
of the Coulomb field describing the interaction between electrons. We find the
dependence of the current noise power on the electron temperature, the applied
voltage bias, and the strength of the Coulomb interaction.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:12:55 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Catelani",
"G.",
""
],
[
"Vavilov",
"M. G.",
""
]
] | [
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] |
711.2068 | Michael Wood-Vasey | W. Michael Wood-Vasey, Andrew S. Friedman, Joshua S. Bloom, Malcolm
Hicken, Maryam Modjaz, Robert P. Kirshner, Dan L. Starr, Cullen H. Blake,
Emilio E. Falco, Andrew H. Szentgyorgyi, Peter Challis, Stephane Blondin,
Kaisey S. Mandel, Armin Rest | Type Ia Supernovae are Good Standard Candles in the Near Infrared:
Evidence from PAIRITEL | 37 pages. 8 Figures. 3 Tables. Revised to ApJ-accepted version | Astrophys.J.689:377-390,2008 | 10.1086/592374 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have obtained 1087 NIR (JHKs) measurements of 21 SNe Ia using PAIRITEL,
nearly doubling the number of well-sampled NIR SN Ia light curves. These data
strengthen the evidence that SNe Ia are excellent standard candles in the NIR,
even without correction for optical light-curve shape. We construct fiducial
NIR templates for normal SNe Ia from our sample, excluding only the three known
peculiar SNe Ia: SN 2005bl, SN 2005hk, and SN 2005ke. The H-band absolute
magnitudes in this sample of 18 SNe Ia have an intrinsic rms of only 0.15 mag
with no correction for light-curve shape. We found a relationship between the
H-band extinction and optical color excess of AH=0.2E(B-V). This variation is
as small as the scatter in distance modulus measurements currently used for
cosmology based on optical light curves after corrections for light-curve
shape. Combining the homogeneous PAIRITEL measurements with 23 SNe Ia from the
literature, these 41 SNe Ia have standard H-band magnitudes with an rms scatter
of 0.16 mag. The good match of our sample with the literature sample suggests
there are few systematic problems with the photometry. We present a nearby NIR
Hubble diagram that shows no correlation of the residuals from the Hubble line
with light-curve properties. Future samples that account for optical and NIR
light-curve shapes, absorption, spectroscopic variation, or host-galaxy
properties may reveal effective ways to improve the use of SNe Ia as distance
indicators. Since systematic errors due to dust absorption in optical bands
remain the leading difficulty in the cosmological use of supernovae, the good
behavior of SN Ia NIR light curves and their relative insensitivity to
reddening make these objects attractive candidates for future cosmological
work.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:01:06 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Feb 2009 16:54:01 GMT"
}
] | 2009-02-24T00:00:00 | [
[
"Wood-Vasey",
"W. Michael",
""
],
[
"Friedman",
"Andrew S.",
""
],
[
"Bloom",
"Joshua S.",
""
],
[
"Hicken",
"Malcolm",
""
],
[
"Modjaz",
"Maryam",
""
],
[
"Kirshner",
"Robert P.",
""
],
[
"Starr",
"Dan L.",
""
],
[
"Blake",
"Cullen H.",
""
],
[
"Falco",
"Emilio E.",
""
],
[
"Szentgyorgyi",
"Andrew H.",
""
],
[
"Challis",
"Peter",
""
],
[
"Blondin",
"Stephane",
""
],
[
"Mandel",
"Kaisey S.",
""
],
[
"Rest",
"Armin",
""
]
] | [
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] |
711.2069 | Deepak Parashar | Florin F. Nichita, Deepak Parashar | New constructions of Yang-Baxter systems | 8 pages, LaTeX | AMS Contemporary Math. 442 (2007) 193-200 | null | null | math.QA math.RA | null | The quantum Yang-Baxter equation admits generalisations to systems of
Yang-Baxter type equations called Yang-Baxter systems. Starting from algebra
structures, we propose new constructions of some constant as well as the
spectral-parameter dependent Yang-Baxter systems. Besides, we also present
explicitly the commutation algebra structure associated to the constant type in
dimension two.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:02:03 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Nichita",
"Florin F.",
""
],
[
"Parashar",
"Deepak",
""
]
] | [
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] |
711.207 | Gil Refael | Ehud Altman, Yariv Kafri, Anatoli Polkovnikov, Gil Refael | The insulating phases and superfluid-insulator transition of disordered
boson chains | 4.2 pages, 1 figure, submitted to PRL | null | 10.1103/PhysRevLett.100.170402 | null | cond-mat.dis-nn cond-mat.supr-con | null | Using a strong disorder real-space renormalization group (RG), we study the
phase diagram of a fully disordered chain of interacting bosons. Since this
approach does not suffer from run-away flows, it allows a direct study of the
insulating phases, which are not accessible in a weak disorder perturbative
treatment. We find that the universal properties of the insulating phase are
determined by the details and symmetries of the onsite chemical-potential
disorder. Three insulating phases are possible: (i) an incompressible Mott
glass with a finite superfluid susceptibility, (ii) a random-singlet glass with
diverging compressibility and superfluid susceptibility, (iii) a Bose glass
with a finite compressibility but diverging superfluid susceptibility. In
addition to characterizing the insulating phases, we show that the
superfluid-insulator transition is always of the Kosterlitz-Thouless
universality class.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:03:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Altman",
"Ehud",
""
],
[
"Kafri",
"Yariv",
""
],
[
"Polkovnikov",
"Anatoli",
""
],
[
"Refael",
"Gil",
""
]
] | [
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] |
711.2071 | Dennis Zaritsky | Dennis Zaritsky, Ann I. Zabludoff, and Anthony H. Gonzalez | Toward Equations of Galactic Structure | submitted to ApJ | null | 10.1086/529577 | null | astro-ph | null | We find that all classes of galaxies, ranging from disks to spheroids and
from dwarf spheroidals to brightest cluster galaxies, lie on a two dimensional
surface within the space defined by the logarithms of the half-light radius,
r_e, mean surface brightness within r_e, I_e, and internal velocity, V^2 =
(1/2)v_c^2 + sigma^2, where v_c is the rotational velocity and sigma is the
velocity dispersion. If these quantities are expressed in terms of kpc,
L_solar/pc^2, and km/s, then log r_e - log V^2 + log I_e + log Upsilon_e + 0.8
= 0, where we provide a fitting function for Upsilon_e, the mass-to-light ratio
within r_e in units of M_solar/L_solar, that depends only on V and I_e. The
scatter about this surface for our heterogeneous sample of 1925 galaxies is
small (< 0.1 dex) and could be as low as ~ 0.05 dex, or 10%. This small scatter
has three possible implications for how gross galactic structure is affected by
internal factors, such as stellar orbital structure, and by external factors,
such as environment. These factors either 1) play no role beyond generating
some of the observed scatter, 2) move galaxies along the surface, or 3) balance
each other to maintain this surface as the locus of galactic structure
equilibria. We cast the behavior of Upsilon_e in terms of the fraction of
baryons converted to stars, eta, and the concentration of those stars within
the dark matter halo, xi = R_{200}/r_e. We derive eta = 1.9 x 10^{-5} (L/L^*)
Upsilon_* V^{-3} and xi = 1.4 V/r_e. Finally, we present and discuss the
distributions of eta and xi for the full range of galaxies. For systems with
internal velocities comparable to that of the Milky Way (149 < V < 163 km/s),
eta = 0.14 +- 0.05, and xi is, on average, ~ 5 times greater for spheroids than
for disks. (Abridged)
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:04:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zaritsky",
"Dennis",
""
],
[
"Zabludoff",
"Ann I.",
""
],
[
"Gonzalez",
"Anthony H.",
""
]
] | [
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-0.0902313739,
0.0914087668,
-0.0554981828,
0.0134798503,
-0.0444467105,
0.0038298829,
-0.030291196,
0.0101617333,
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] |
711.2072 | Oriol Pujolas | Claudia de Rham, Gia Dvali, Stefan Hofmann, Justin Khoury, Oriol
Pujolas, Michele Redi and Andrew J. Tolley | Cascading DGP | 4 pages; one reference added and a typo corrected | Phys.Rev.Lett.100:251603,2008 | 10.1103/PhysRevLett.100.251603 | null | hep-th astro-ph hep-ph | null | We present a higher codimension generalization of the DGP scenario which,
unlike previous attempts, is free of ghost instabilities. The 4D propagator is
made regular by embedding our visible 3-brane within a 4-brane, each with their
own induced gravity terms, in a flat 6D bulk. The model is ghost-free if the
tension on the 3-brane is larger than a certain critical value, while the
induced metric remains flat. The gravitational force law `cascades' from a 6D
behavior at the largest distances followed by a 5D and finally a 4D regime at
the shortest scales.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:06:54 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Dec 2007 22:46:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"de Rham",
"Claudia",
""
],
[
"Dvali",
"Gia",
""
],
[
"Hofmann",
"Stefan",
""
],
[
"Khoury",
"Justin",
""
],
[
"Pujolas",
"Oriol",
""
],
[
"Redi",
"Michele",
""
],
[
"Tolley",
"Andrew J.",
""
]
] | [
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] |
711.2073 | Elena Gallo | Elena Gallo, Tommaso Treu, Jeremy Jacob, Jong-Hak Woo, Phil Marshall,
Robert Antonucci (UCSB) | AMUSE-Virgo I. Super-massive black holes in low-mass spheroids | Revised version, accepted by ApJ | null | 10.1086/588012 | null | astro-ph | null | We present the first results from the AGN Multiwavelength Survey of
Early-type galaxies in the Virgo cluster (AMUSE-Virgo). This large program
targets 100 early-type galaxies with the Advanced CCD Imaging Spectrometer on
board the Chandra X-ray Observatory and the Multi-band Imaging Photometer on
board the Spitzer Space Telescope, with the aim of providing an unbiased census
of low-level super-massive black hole (SMBH) activity in the local universe.
Here we report on the Chandra observations of the first 16 targets, and combine
them with results from archival data of another, typically more massive, 16
targets. Point-like X-ray emission from a position coincident with the optical
nucleus is detected in 50% of the galaxies (down to our completeness limit of
~4E+38 erg/sec). Two of the X-ray nuclei are hosted by galaxies (VCC1178=N4464
and VCC1297=N4486B) with absolute B magnitudes fainter than -18, where nuclear
star clusters are known to become increasingly common. After carefully
accounting for possible contamination from low mass X-ray binaries, we argue
that the detected nuclear X-ray sources are most likely powered by low-level
accretion on to a SMBH, with a <11% chance contamination in VCC1178, where a
star cluster is barely resolvable in archival Hubble Space Telescope images.
Based on black hole mass estimates from the global properties of the host
galaxies, all the detected nuclei are highly sub-Eddington, with luminosities
in the range -8.4<log(L_0.3-10keV/L_Edd)<-5.9. The incidence of nuclear X-ray
activity increases with the stellar mass M_star of the host galaxy: only
between 3-44% of the galaxies with M_star<1E+10 M_Sun harbor an X-ray active
SMBH. The fraction rises to between 49-87% in galaxies with stellar mass above
1E+10 M_Sun (at the 95% confidence level).
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:08:15 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 00:58:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gallo",
"Elena",
"",
"UCSB"
],
[
"Treu",
"Tommaso",
"",
"UCSB"
],
[
"Jacob",
"Jeremy",
"",
"UCSB"
],
[
"Woo",
"Jong-Hak",
"",
"UCSB"
],
[
"Marshall",
"Phil",
"",
"UCSB"
],
[
"Antonucci",
"Robert",
"",
"UCSB"
]
] | [
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] |
711.2074 | Silvia Viola Kusminskiy | S. Viola Kusminskiy, K. S. D. Beach, A. H. Castro Neto, David K.
Campbell | Mean Field study of the heavy fermion metamagnetic transition | 9+ pages, 5 figures. Final version | Phys. Rev. B 77, 094419 (2008) | 10.1103/PhysRevB.77.094419 | null | cond-mat.str-el | null | We investigate the evolution of the heavy fermion ground state under
application of a strong external magnetic field. We present a richer version of
the usual hybridization mean field theory that allows for hybridization in both
the singlet and triplet channels and incorporates a self-consistent Weiss
field. We show that for a magnetic field strength B*, a filling-dependent
fraction of the zero-field hybridization gap, the spin up quasiparticle band
becomes fully polarized--an event marked by a sudden jump in the magnetic
susceptibility. The system exhibits a kind of quantum rigidity in which the
susceptibility (and several other physical observables) are insensitive to
further increases in field strength. This behavior ends abruptly with the
collapse of the hybridization order parameter in a first-order transition to
the normal metallic state. We argue that the feature at B* corresponds to the
"metamagnetic transition" in YbRh2Si2. Our results are in good agreement with
recent experimental measurements.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:10:45 GMT"
},
{
"version": "v2",
"created": "Mon, 31 Mar 2008 23:53:58 GMT"
}
] | 2008-04-01T00:00:00 | [
[
"Kusminskiy",
"S. Viola",
""
],
[
"Beach",
"K. S. D.",
""
],
[
"Neto",
"A. H. Castro",
""
],
[
"Campbell",
"David K.",
""
]
] | [
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] |
711.2075 | Alain Destexhe | R. Brette, Z. Piwkowska, M. Rudolph-Lilith, T. Bal, A. Destexhe | High-resolution intracellular recordings using a real-time computational
model of the electrode | null | null | null | null | q-bio.NC | null | Intracellular recordings of neuronal membrane potential are a central tool in
neurophysiology. In many situations, especially in vivo, the traditional
limitation of such recordings is the high electrode resistance, which may cause
significant measurement errors. We introduce a computer-aided technique, Active
Electrode Compensation (AEC), based on a digital model of the electrode
interfaced in real time with the electrophysiological setup. The
characteristics of this model are first estimated using white noise current
injection. The electrode and membrane contribution are digitally separated, and
the recording is then made by online subtraction of the electrode contribution.
Tests comparing AEC to other techniques demonstrate that it yields recordings
with improved accuracy. It enables high-frequency recordings in demanding
conditions, such as injection of conductance noise in dynamic-clamp mode, not
feasible with a single high resistance electrode until now. AEC should be
particularly useful to characterize fast phenomena in neurons, in vivo and in
vitro.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:51:26 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Brette",
"R.",
""
],
[
"Piwkowska",
"Z.",
""
],
[
"Rudolph-Lilith",
"M.",
""
],
[
"Bal",
"T.",
""
],
[
"Destexhe",
"A.",
""
]
] | [
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] |
711.2076 | Shravan Hanasoge | S. M. Hanasoge, A. C. Birch, T. J. Bogdan, L. Gizon | {\it f}-mode interactions with thin flux tubes: the scattering matrix | Accepted, ApJ; 15 pages, 4 figures | null | 10.1086/587455 | null | astro-ph | null | We calculate the scattering effects associated with the interaction of a
surface gravity or {\it f} mode with a thin magnetic flux tube embedded in a
realistically stratified medium. We find that the dominant scattered wave is an
$f$ mode with amplitude and phase of 1.17% and around $49^\circ$ relative to
the incident wave, compared to the values of 0.13% and $40^\circ$ estimated
from observations. The extent of scattering into high-order acoustic $p$ modes
is too weak to be accurately characterized. We recover the result that the
degree of scattering is enhanced as (a) the frequency of the incident wave
increases and (b) the flux tube becomes magnetically dominated.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:14:56 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 00:01:48 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Feb 2008 18:49:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hanasoge",
"S. M.",
""
],
[
"Birch",
"A. C.",
""
],
[
"Bogdan",
"T. J.",
""
],
[
"Gizon",
"L.",
""
]
] | [
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] |
711.2077 | Jean Pradines | Jean Pradines | Lie Groupoids as generalized atlases | 34 pages, lecture delivered at the 5th Conference on Geometry ans
Topology of Manifolds, Krynica (Poland), April 2003 | CEJM 2(5) 2004 624-662 | null | null | math.DG math.CT | null | Starting with some motivating examples (classical atlases for a manifold,
space of leaves of a foliation, group orbits), we propose to view a Lie
groupoid as a generalized atlas for the "virtual structure" of its orbit space,
the equivalence between atlases being here the smooth Morita equivalence. This
"structure" keeps memory of the isotropy groups and of the smoothness as well.
To take the smoothness into account, we claim that we can go very far by
retaining just a few formal properties of embeddings and surmersions, yielding
a very polymorphous unifying theory. We suggest further developments.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:15:48 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Pradines",
"Jean",
""
]
] | [
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] |
711.2078 | Pasquale Tricarico | Pasquale Tricarico | Figure-Figure Interaction Between Bodies Having Arbitrary Shapes and
Mass Distributions: A Power Series Expansion Approach | 13 pages, accepted by Celestial Mechanics and Dynamical Astronomy | null | 10.1007/s10569-008-9128-7 | null | astro-ph | null | We derive an expression for the mutual gravitational force and torque of two
bodies having arbitrary shapes and mass distributions, as an expansion in power
series of their products of inertia and of the relative coordinates of their
centres of mass. The absolute convergence of all the power series developed is
rigorously demonstrated. The absence of transcendental functions makes this
formalism suitable for fast numerical applications. The products of inertia
used here are directly related to the spherical harmonics coefficients, and we
provide a detailed analysis of this relationship.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:19:13 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 06:50:04 GMT"
},
{
"version": "v3",
"created": "Thu, 28 Feb 2008 01:50:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tricarico",
"Pasquale",
""
]
] | [
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] |
711.2079 | Iain W. Stewart | Sean Fleming, Andre H. Hoang, Sonny Mantry, Iain W. Stewart | Top Jets in the Peak Region: Factorization Analysis with NLL Resummation | 92 pages, 22 figs, typos corrected, journal version | Phys.Rev.D77:114003,2008 | 10.1103/PhysRevD.77.114003 | MIT-CTP 3868, CALT-68-2625, MPP-2007-103 | hep-ph nucl-th | null | We consider top-quarks produced at large energy in e+e- collisions, and
address the question of what top-mass can be measured from reconstruction. The
production process is characterized by well separated scales: the
center-of-mass energy, Q, the top mass, m, the top decay width, Gamma_t, and
also LambdaQCD; scales which can be disentangled with effective theory methods.
In particular we show how the mass measurement depends on the way in which soft
radiation is treated, and that this can shift the mass peak by an amount of
order Q LambdaQCD/m. We sum large logs for Q >> m >> Gamma_t > LambdaQCD and
demonstrate that the renormalization group ties together the jet and soft
interactions below the scale m. Necessary conditions for the invariant mass
spectrum to be protected from large logs are formulated. Results for the
cross-section are presented at next-to-leading order with next-to-leading-log
resummation, for invariant masses in the peak region and the tail region. Using
our results we also predict the thrust distribution for massive quark jets at
NLL order for large thrust. We demonstrate that soft radiation can be precisely
controlled using data on massless jet production, and that in principle, a
short distance mass parameter can be measured using jets with precision better
than LambdaQCD.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 20:52:46 GMT"
},
{
"version": "v2",
"created": "Sat, 31 May 2008 18:27:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fleming",
"Sean",
""
],
[
"Hoang",
"Andre H.",
""
],
[
"Mantry",
"Sonny",
""
],
[
"Stewart",
"Iain W.",
""
]
] | [
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] |
711.208 | Eric S. Swanson | T. Barnes and E.S. Swanson | Hadron Loops: General Theorems and Application to Charmonium | 10 pages, 1 ps figure. Typos corrected; discussion of psi-eta_c mass
splitting added, published version | Phys.Rev.C77:055206,2008 | 10.1103/PhysRevC.77.055206 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we develop a formalism for incorporating hadron loops in the
quark model. We derive expressions for mass shifts, continuum components and
mixing amplitudes of "quenched" quark model states due to hadron loops, as
perturbation series in the valence-continuum coupling Hamiltonian. We prove
three general theorems regarding the effects of hadron loops, which show that
given certain constraints on the external "bare" quark model states, the
valence-continuum coupling, and the hadrons summed in the loops, the following
results hold: (1) The loop mass shifts are identical for all states within a
given N,L multiplet. (2) These states have the same total open-flavor decay
widths. (3) Loop-induced valence configuration mixing vanishes provided that
${\L}_i \neq \L_f$ or $\S_i \neq \S_f$. The charmonium system is used as a
numerical case study, with the $^3\P_0$ decay model providing the
valence-continuum coupling. We evaluate the mass shifts and continuum mixing
numerically for all 1S, 1P and 2S charmonium valence states due to loops of D,
D$^*$, D$_s$ and D$_s^*$ meson pairs. We find that the mass shifts are quite
large, but are numerically similar for all the low-lying charmonium states, as
suggested by the first theorem. Thus, loop mass shifts may have been "hidden"
in the valence quark model by a change of parameters. The two-meson continuum
components of the physical charmonium states are also found to be large,
creating challenges for the interpretation of the constituent quark model.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:26:40 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Dec 2007 05:50:14 GMT"
},
{
"version": "v3",
"created": "Thu, 5 Mar 2009 18:29:11 GMT"
}
] | 2009-03-05T00:00:00 | [
[
"Barnes",
"T.",
""
],
[
"Swanson",
"E. S.",
""
]
] | [
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711.2081 | Pawe{\l} Klimas | Pawel Klimas | Perturbations of the signum-Gordon model | 22 pages, 8 figures | J. Phys. A: Math. Theor. 41 (2008) 095403 | 10.1088/1751-8113/41/9/095403 | null | hep-th | null | We investigate a perturbation of a scalar field model (called here the
signum-Gordon model) with the potential $V(f)=|f|$. The perturbation
generalizes the signum-Gordon model to the signum-Klein-Gordon model i.e. to
the case $V(f)=|f|-{1/2}\lambda f^2$, where $\lambda$ is a small parameter.
Such a generalization breaks the scaling symmetry of the signum-Gordon model.
In this paper we concentrate on solutions for self-similar initial data. Such
data are particulary useful for identification of the effects caused by the
term that breaks the scaling symmetry. We have found that the behaviour of the
solutions is quite interesting - they escape and return periodically to the
self-similar initial data.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:31:06 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 09:47:20 GMT"
}
] | 2008-02-19T00:00:00 | [
[
"Klimas",
"Pawel",
""
]
] | [
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] |
711.2082 | Christian Heiliger | Christian Heiliger, Michael Czerner, Bogdan Yu. Yavorsky, Ingrid
Mertig, Mark D. Stiles | Implementation of a non-equilibrium Green's function method to calculate
spin transfer torque | 4 pages, 4 figures | J. Appl. Phys. 103, 07A709 (2008) | 10.1063/1.2835071 | null | cond-mat.mes-hall | null | We present an implementation of the steady state Keldysh approach in a
Green's function multiple scattering scheme to calculate the non-equilibrium
spin density. This density is used to obtain the spin transfer torque in
junctions showing the magnetoresistance effect. We use our implementation to
study the spin transfer torque in metallic Co/Cu/Co junctions.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:31:48 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 20:51:15 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Heiliger",
"Christian",
""
],
[
"Czerner",
"Michael",
""
],
[
"Yavorsky",
"Bogdan Yu.",
""
],
[
"Mertig",
"Ingrid",
""
],
[
"Stiles",
"Mark D.",
""
]
] | [
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0.0419459082,
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0.0416307077,
-0.0230944958,
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] |
711.2083 | Alexander Braverman | Alexander Braverman and Michael Finkelberg | Pursuing the double affine Grassmannian I: transversal slices via
instantons on A_k-singularities | Section 7 has been rewritten to correct previous mistakes | Duke Math. J. 152, no. 2 (2010), 175-206 | 10.1215/00127094-2010-011 | null | math.AG hep-th math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is the first in a series that describe a conjectural analog of the
geometric Satake isomorphism for an affine Kac-Moody group. In this paper we
construct a model for the singularities of some would-be Schubert varieties in
the affine Grassmannian for an affine Kac-Moody group. We formulate a
conjecture describing the (local) intersection cohomology of these varieties in
terms of integrable representations of the Langlands dual affine Kac-Moody
group and check this conjecture in a number of cases. Roughly speaking the
above singularities are constructed by looking at the Uhlenbeck space of
instantons on the quotient of the affine plane by a finite cyclic subgroup of
SL(2).
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 21:42:39 GMT"
},
{
"version": "v2",
"created": "Sun, 25 Nov 2007 19:00:27 GMT"
},
{
"version": "v3",
"created": "Mon, 5 May 2008 16:02:01 GMT"
},
{
"version": "v4",
"created": "Tue, 3 Mar 2009 19:54:41 GMT"
},
{
"version": "v5",
"created": "Fri, 13 Nov 2009 20:00:30 GMT"
}
] | 2019-12-19T00:00:00 | [
[
"Braverman",
"Alexander",
""
],
[
"Finkelberg",
"Michael",
""
]
] | [
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] |
711.2084 | Lee Lindblom | Lee Lindblom, Keith D. Matthews, Oliver Rinne, and Mark A. Scheel | Gauge Drivers for the Generalized Harmonic Einstein Equations | 17 pages, 9 figures | Phys.Rev.D77:084001,2008 | 10.1103/PhysRevD.77.084001 | null | gr-qc | null | The generalized harmonic representation of Einstein's equation is manifestly
hyperbolic for a large class of gauge conditions. Unfortunately most of the
useful gauges developed over the past several decades by the numerical
relativity community are incompatible with the hyperbolicity of the equations
in this form. This paper presents a new method of imposing gauge conditions
that preserves hyperbolicity for a much wider class of conditions, including as
special cases many of the standard ones used in numerical relativity: e.g.,
K-freezing, Gamma-freezing, Bona-Masso slicing, conformal Gamma-drivers, etc.
Analytical and numerical results are presented which test the stability and the
effectiveness of this new gauge driver evolution system.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 23:33:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lindblom",
"Lee",
""
],
[
"Matthews",
"Keith D.",
""
],
[
"Rinne",
"Oliver",
""
],
[
"Scheel",
"Mark A.",
""
]
] | [
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] |
711.2085 | Markus Sch\"oller | S. Hubrig, R.V. Yudin, M. Pogodin, M. Schoeller, G.J. Peters | Evidence for weak magnetic fields in early-type emission stars | 4 pages, 3 figures, 1 table, accepted for publication in AN | null | 10.1002/asna.200710877 | null | astro-ph | null | We report the results of our study of magnetic fields in a sample of 15 Be
stars using spectropolarimetric data obtained at the European Southern
Observatory with the multi-mode instrument FORS1 installed at the 8m Kueyen
telescope. We detect weak photospheric magnetic fields in four stars, HD56014,
HD148184, HD155806, and HD181615. We note that for HD181615 the evolutionary
status is not obvious due to the fact that it is a binary system currently
observed in the initial rapid phase of mass exchange between the two
components. Further, we notify the possible presence of distinct circular
polarisation features in the circumstellar components of Ca II H&K in three
stars, HD58011, HD117357, and HD181615, hinting at a probable presence of
magnetic fields in the circumstellar mass loss disks of these stars. We
emphasize the need for future spectropolarimetric observations of Be stars with
detected magnetic fields to study the temporal evolution of their magnetic
fields and the correlation of magnetic field properties with dynamical
phenomena taking place in the gaseous circumstellar disks of these stars.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 22:17:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hubrig",
"S.",
""
],
[
"Yudin",
"R. V.",
""
],
[
"Pogodin",
"M.",
""
],
[
"Schoeller",
"M.",
""
],
[
"Peters",
"G. J.",
""
]
] | [
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] |
711.2086 | Gaurav Khanna | Subir Sabharwal and Gaurav Khanna | Numerical solutions to lattice-refined models in loop quantum cosmology | null | Class.Quant.Grav.25:085009,2008 | 10.1088/0264-9381/25/8/085009 | null | gr-qc | null | In this article, we develop an intuitive and efficient, numerical technique
to solve the quantum evolution equation of generic lattice-refined models in
loop quantum cosmology. As an application of this method, we extensively study
the solutions of the recently introduced, lattice-refined anisotropic model of
the Schwarzschild interior geometry. Our calculations suggest that the results
obtained from the approach are accurate, robust and are in complete agreement
with the expectations from the von Neumann stability analysis of the model.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 22:15:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sabharwal",
"Subir",
""
],
[
"Khanna",
"Gaurav",
""
]
] | [
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] |
711.2087 | Edna Ruckhaus | Edna Ruckhaus, Eduardo Ruiz, Maria-Esther Vidal | Query Evaluation and Optimization in the Semantic Web | 18 pages, 8 figures, 7 tables. Presented at the ALPSWS2006 First
International Workshop on Applications of Logic Programming in the Semantic
Web and Semantic Web Services where it got a "Best Paper Award". To appear in
Theory and Practice of Logic Programming (TPLP) | null | null | null | cs.DB cs.LO | null | We address the problem of answering Web ontology queries efficiently. An
ontology is formalized as a Deductive Ontology Base (DOB), a deductive database
that comprises the ontology's inference axioms and facts. A cost-based query
optimization technique for DOB is presented. A hybrid cost model is proposed to
estimate the cost and cardinality of basic and inferred facts. Cardinality and
cost of inferred facts are estimated using an adaptive sampling technique,
while techniques of traditional relational cost models are used for estimating
the cost of basic facts and conjunctive ontology queries. Finally, we implement
a dynamic-programming optimization algorithm to identify query evaluation plans
that minimize the number of intermediate inferred facts. We modeled a subset of
the Web ontology language OWL Lite as a DOB, and performed an experimental
study to analyze the predictive capacity of our cost model and the benefits of
the query optimization technique. Our study has been conducted over synthetic
and real-world OWL ontologies, and shows that the techniques are accurate and
improve query performance. To appear in Theory and Practice of Logic
Programming (TPLP).
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 22:31:09 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Ruckhaus",
"Edna",
""
],
[
"Ruiz",
"Eduardo",
""
],
[
"Vidal",
"Maria-Esther",
""
]
] | [
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] |
711.2088 | Sumanta Das | Sumanta Das and G.S. Agarwal | Photon-Photon Correlations as a Probe of Vacuum Induced Coherence
Effects | 7 pages, 6 figures, submitted to Physical Review A | PHYSICAL REVIEW A 77, 033850 (2008) | 10.1103/PhysRevA.77.033850 | null | quant-ph | null | We present new experimental implications of the effects of vacuum induced
coherence on the photon -photon correlation in the pi-polarized fluorescence in
j = 1/2 to j = 1/2 transition. These effects should be thus observable in
measurements of photon statistics in for example Hg and Ba ion traps.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 22:39:24 GMT"
}
] | 2009-11-23T00:00:00 | [
[
"Das",
"Sumanta",
""
],
[
"Agarwal",
"G. S.",
""
]
] | [
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] |
711.2089 | Justin Finke | J. D. Finke, J. C. Shields, M. Boettcher, S. Basu | Redshift Limits of BL Lacertae Objects from Optical Spectroscopy | 4 pages, 2 figures. Accepted by A&A Research Notes | null | 10.1051/0004-6361:20078492 | null | astro-ph | null | Context: BL Lacertae objects have been the targets for numerous recent
multiwavelength campaigns, continuum spectral variability studies, and
theoretical spectral and variability modeling. A meaningful interpretation of
the results of such studies requires a reliable knowledge of the objects'
redshifts; however, the redshifts for many are still unknown or uncertain.
Aims: Therefore, we hope to determine or constrain the redshifts of six BL Lac
objects with unknown or poorly known redshifts. Methods: Observations were made
of these objects with the MDM 2.4 m Hiltner telescope. Although no spectral
features were detected, and thus no redshifts could be measured, lower redshift
limits were assigned to the objects based on the expected equivalent widths of
absorption features in their host galaxies. Redshifts were also estimated for
some objects by assuming the host galaxies are standard candles and using host
galaxy apparent magnitudes taken from the literature. Results: The commonly
used redshift of $z=0.102$ for 1219+285 is almost certainly wrong, while the
redshifts of the other objects studied remain undetermined.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 22:41:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Finke",
"J. D.",
""
],
[
"Shields",
"J. C.",
""
],
[
"Boettcher",
"M.",
""
],
[
"Basu",
"S.",
""
]
] | [
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] |
711.209 | Mohsen Shadmehri | Mohsen Shadmehri | Dynamics of charged dust particles in protoplanetary discs | Accepted for publication in Astrophysics & Space Science | Astrophys.SpaceSci.314:217-223,2008 | 10.1007/s10509-008-9762-2 | null | astro-ph | null | We study the effect of an imposed magnetic field on the motion of charged
dust particles in magnetically active regions of a protoplanetary disc.
Assuming a power law structure for the vertical and the toroidal components of
the magnetic field for the regions beyond magnetically dead region of the disc,
the radial and the vertical velocities of the charged particles, in the
asymptotic case of small particles, are calculated analytically. While grains
with radii smaller than a critical radius significantly are affected by the
magnetic force, motion of the particles with larger radii is independent of the
magnetic field. The critical radius depends on the magnetic geometry and the
charge of the grains. Assuming that a grain particle has one elementary charge
and the physical properties of the disc correspond to a minimum-mass solar
nebula, we show that only micron-sized grains are affected by the magnetic
force. Also, charge polarity determines direction of the radial velocity. For
such small particles, both the radial and the vertical velocities increase due
to the magnetic force.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 23:03:11 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 11:43:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Shadmehri",
"Mohsen",
""
]
] | [
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] |
711.2091 | Falk Herwig | Paul Woodward (1), Falk Herwig (2), David Porter (1), Tyler Fuchs (1),
Anthony Nowatzki (1) and Marco Pignatari (2) ((1) Laboratory for
Computational Science and Engineering, University of Minnesota, USA, (2)
Astrophysics Group, School of Physical and Geographical Sciences, Keele
University, UK) | Nuclear burning and mixing in the first stars: entrainment at a
convective boundary using the PPB advection scheme | Proceedings paper of First Stars III, 2006, Santa Fe, contributions
by Falk Herwig and Paul Woodward, to appear in AIP Conf. Ser., ed. T. Abel,
A. Heger and B. O'Shea | AIP Conf.Proc.990:300-308,2008 | 10.1063/1.2905567 | LAUR 07-7598 | astro-ph | null | The evolution of the first generations of stars at zero or extremly low
metallicity, and especially some crucial properties like the primary N14
production, is charactarized by convective-reactive mixing events that are
mostly absent from similar evolution phases at solar-like metallicity. These
episodes occur when unprocessed H-rich material is mixed accross a convective
boundary into C12 rich He-burning material, as for example in He-shell flashes
of extremely-low metallicity AGB stars. In this paper we describe the
astrophysical context of such convective-reactive events, including the
difficulty of current one-dimensional stellar evolution models to correctly
simulate these evolutionary phases. We then describe the requirements and
current state of modeling convective-reactive processes in the first stars
environment. We demonstrate some of the new concepts that we are applying to
this problem, i.e. the highly accurate PPB advection scheme in the framework of
PPM hydrodynamic simulations of mixing accross a very stiff convective
boundary. We show initial results of such simulations that address the first
non-reactive step of this problem, which is the entrainment of H at the top
boundary of the He-shell flash convection zone.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 23:20:49 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Woodward",
"Paul",
""
],
[
"Herwig",
"Falk",
""
],
[
"Porter",
"David",
""
],
[
"Fuchs",
"Tyler",
""
],
[
"Nowatzki",
"Anthony",
""
],
[
"Pignatari",
"Marco",
""
]
] | [
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] |
711.2092 | Binhai Zhu | Binhai Zhu | On the 1-density of Unit Ball Covering | 11 pages, 4 figures | null | null | null | math.GM | null | Motivated by modern applications like image processing and wireless sensor
networks, we consider a variation of the famous Kepler Conjecture. Given any
infinite set of unit balls covering the whole space, we want to know the
optimal (lim sup) density of the volume which is covered by exactly one ball
(i.e., the maximum such density over all unit ball covers, called the {\em
optimal 1-density} and denoted as $\delta_d$, where $d$ is the dimension of the
Euclidean space). We prove that in 2D the optimal 1-density
$\delta_2=(3\sqrt(3)-\pi)/\pi \approx 0.6539$, which is achieved through a
regular hexagonal covering. In 3D, the problem is widely open and we present a
Dodecehadral Cover Conjecture which states that the optimal 1-density in 3D,
$\delta_3$, is bounded from above by the 1-density of a unit ball whose Voronoi
polyhedron is a regular dodecahedron of circum-radius one (determined by 12
extra unit balls). We show numerically that this 1-density $\delta_3(dc)\approx
0.315$.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 23:08:28 GMT"
},
{
"version": "v2",
"created": "Sat, 24 Nov 2007 22:44:08 GMT"
},
{
"version": "v3",
"created": "Fri, 30 Nov 2007 18:19:46 GMT"
},
{
"version": "v4",
"created": "Thu, 20 Dec 2007 18:01:54 GMT"
}
] | 2007-12-20T00:00:00 | [
[
"Zhu",
"Binhai",
""
]
] | [
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] |
711.2093 | Romain Tessera | Xiaoman Chen, Romain Tessera, Xianjin Wang, Guoliang Yu | Metric sparsification and operator norm localization | null | null | null | null | math.MG math.KT | null | We study an operator norm localization property and its applications to the
coarse Novikov conjecture in operator K-theory. A metric space X is said to
have operator norm localization property if there exists a positive number c
such that for every r>0, there is R>0 for which, if m is a positive locally
finite Borel measure on X, H is a separable infinite dimensional Hilbert space
and T is a bounded linear operator acting on L^2(X,m) with propagation r, then
there exists an unit vector v satisfying with support of diameter at most R and
such that |Tv| is larger or equal than c|T|. If X has finite asymptotic
dimension, then X has operator norm localization property. In this paper, we
introduce a sufficient geometric condition for the operator norm localization
property. This is used to give many examples of finitely generated groups with
infinite asymptotic dimension and the operator norm localization property. We
also show that any sequence of expanding graphs does not possess the operator
norm localization property.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 23:20:05 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Chen",
"Xiaoman",
""
],
[
"Tessera",
"Romain",
""
],
[
"Wang",
"Xianjin",
""
],
[
"Yu",
"Guoliang",
""
]
] | [
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] |
711.2094 | Shaul Mukamel | Christoph A. Marx, Upendra Harbola and Shaul Mukamel | Nonlinear optical spectroscopy of single, few, and many molecules;
nonequilibrium Green's function QED approach | article: 33 pages (preprint format!) ''paper.tex'' figures: 17
figures (.eps) in folder ``figures'' | null | 10.1103/PhysRevA.77.022110 | null | quant-ph | null | Nonlinear optical signals from an assembly of N noninteracting particles
consist of an incoherent and a coherent component, whose magnitudes scale \sim
N and \sim N(N-1), respectively. A unified microscopic description of both
types of signals is developed using a quantum electrodynamical (QED) treatment
of the optical fields. Closed nonequilibrium Green's function expressions are
derived that incorporate both stimulated and spontaneous processes. General
(n+1)-wave mixing experiments are discussed as an example of spontaneously
generated signals. When performed on a single particle, such signals cannot be
expressed in terms of the nth order polarization, as predicted by the
semiclassical theory. Stimulated processes are shown to be purely incoherent in
nature. Within the QED framework, heterodyne-detected wave mixing signals are
simply viewed as incoherent stimulated emission, whereas homodyne signals are
generated by coherent spontaneous emission.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 23:29:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marx",
"Christoph A.",
""
],
[
"Harbola",
"Upendra",
""
],
[
"Mukamel",
"Shaul",
""
]
] | [
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] |
711.2095 | M\'arton Hidas | M. G. Hidas (1 and 2), A. A. Christou (3), T. M. Brown (1 and 2) ((1)
Las Cumbres Observatory Global Telescope, (2) University of California, Santa
Barbara, (3) Armagh Observatory) | An observation of a mutual event between two satellites of Uranus | 4 pages, 3 figures, accepted for publication in MNRAS Letters | null | 10.1111/j.1745-3933.2007.00418.x | null | astro-ph | null | We present observations of the occultation of Umbriel by Oberon on 4 May,
2007. We believe this is the first observed mutual event between satellites of
Uranus. Fitting a simple geometric model to the lightcurve, we measure the
mid-event time with a precision of 4 seconds. We assume previously measured
values for the albedos of the two satellites (Karkoschka 2001), and measure the
impact parameter to be 500 +/- 80 km. These measurements are more precise than
estimates based on current ephemerides for these satellites. Therefore
observations of additional mutual events during the 2007-2008 Uranian equinox
will provide improved estimates of their orbital and physical parameters.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 23:43:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hidas",
"M. G.",
"",
"1 and 2"
],
[
"Christou",
"A. A.",
"",
"1 and 2"
],
[
"Brown",
"T. M.",
"",
"1 and 2"
]
] | [
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] |
711.2096 | Eduardo Candelario-Jalil | Eduardo Candelario-Jalil, Saeid Taheri, Yi Yang, Rohit Sood, Mark
Grossetete, Eduardo Y. Estrada, Bernd L. Fiebich, Gary A. Rosenberg | Cyclooxygenase Inhibition Limits Blood-Brain Barrier Disruption
following Intracerebral Injection of Tumor Necrosis Factor-alpha in the Rat | null | Journal of Pharmacology and Experimental Therapeutics 323(2):
488-498 (2007) | null | null | q-bio.TO q-bio.BM | null | Increased permeability of the blood-brain barrier (BBB) is important in
neurological disorders. Neuroinflammation is associated with increased BBB
breakdown and brain injury. Tumor necrosis factor-a (TNF-a) is involved in BBB
injury and edema formation through a mechanism involving matrix
metalloproteinase (MMP) upregulation. There is emerging evidence indicating
that cyclooxygenase (COX) inhibition limits BBB disruption following ischemic
stroke and bacterial meningitis, but the mechanisms involved are not known. We
used intracerebral injection of TNF-a to study the effect of COX inhibition on
TNF-a-induced BBB breakdown, MMP expression/activity and oxidative stress. BBB
disruption was evaluated by the uptake of 14C-sucrose into the brain and by
magnetic resonance imaging (MRI) utilizing Gd-DTPA as a paramagnetic contrast
agent. Using selective inhibitors of each COX isoform, we found that COX-1
activity is more important than COX-2 in BBB opening. TNF-a induced a
significant upregulation of gelatinase B (MMP-9), stromelysin-1 (MMP-3) and
COX-2. In addition, TNF-a significantly depleted glutathione as compared to
saline. Indomethacin (10 mg/kg; i.p.), an inhibitor of COX-1 and COX-2, reduced
BBB damage at 24 h. Indomethacin significantly attenuated MMP-9 and MMP-3
expression and activation, and prevented the loss of endogenous radical
scavenging capacity following intracerebral injection of TNF-a. Our results
show for the first time that BBB disruption during neuroinflammation can be
significantly reduced by administration of COX inhibitors. Modulation of COX in
brain injury by COX inhibitors or agents modulating prostaglandin E2
formation/signaling may be useful in clinical settings associated with BBB
disruption.
| [
{
"version": "v1",
"created": "Tue, 13 Nov 2007 23:54:39 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Candelario-Jalil",
"Eduardo",
""
],
[
"Taheri",
"Saeid",
""
],
[
"Yang",
"Yi",
""
],
[
"Sood",
"Rohit",
""
],
[
"Grossetete",
"Mark",
""
],
[
"Estrada",
"Eduardo Y.",
""
],
[
"Fiebich",
"Bernd L.",
""
],
[
"Rosenberg",
"Gary A.",
""
]
] | [
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] |
711.2097 | Igor Ivanov | I. P. Ivanov | Production of spin-3 mesons in diffractive DIS | 4 pages, talk given at the 12th Workshop on High Energy Spin Physics
(DSPIN-07), Dubna, Russia, September 3-7, 2007 | null | null | null | hep-ph | null | Non-trivial spin effects do not die out with energy growth. Here, we discuss
one example of such effects -- production of spin-3 mesons in diffractive DIS.
Using both explicit k_t-factorization calculations and their
vector-dominance-model interpretation, we argue that diffractive production of
rho_3(1690) is a unique probe of several novel aspects of diffraction.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 00:01:38 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Ivanov",
"I. P.",
""
]
] | [
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] |
711.2098 | Alexander Isaev | A. V. Isaev and N. G. Kruzhilin | Proper actions of Lie groups of dimension $n^2+1$ on $n$-dimensional
complex manifolds | 60 pages | null | 10.1016/j.jmaa.2007.12.050 | null | math.CV math.DG | null | In this paper we continue to study actions of high-dimensional Lie groups on
complex manifolds. We give a complete explicit description of all pairs
$(M,G)$, where $M$ is a connected complex manifold $M$ of dimension $n\ge 2$,
and $G$ is a connected Lie group of dimension $n^2+1$ acting effectively and
properly on $M$ by holomorphic transformations. This result complements a
classification obtained earlier by the first author for $n^2+2\le\hbox{dim}
G<n^2+2n$ and a classical result due to W. Kaup for the maximal group dimension
$n^2+2n$.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 00:14:06 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Isaev",
"A. V.",
""
],
[
"Kruzhilin",
"N. G.",
""
]
] | [
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] |
711.2099 | Hiroshi Suzuki | Issaku Kanamori, Fumihiko Sugino and Hiroshi Suzuki | Euclidean lattice simulation for the dynamical supersymmetry breaking | 5 pages, 4 figures, the final version to appear in Phys. Rev. D | Phys.Rev.D77:091502,2008 | 10.1103/PhysRevD.77.091502 | RIKEN-TH-121, OIQP-07-15 | hep-lat hep-th | null | The global supersymmetry is spontaneously broken if and only if the
ground-state energy is strictly positive. We propose to use this fact to
observe the spontaneous supersymmetry breaking in euclidean lattice
simulations. For lattice formulations that possess a manifest fermionic
symmetry, there exists a natural choice of a hamiltonian operator that is
consistent with a topological property of the Witten index. We confirm validity
of our idea in models of the supersymmetric quantum mechanics. We then examine
a possibility of a dynamical supersymmetry breaking in the two-dimensional
$\mathcal{N}=(2,2)$ super Yang-Mills theory with the gauge group $\SU(2)$, for
which the Witten index is unknown. Differently from a recent conjectural claim,
our numerical result tempts us to conclude that supersymmetry is not
spontaneously broken in this system.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 00:40:12 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 00:53:00 GMT"
},
{
"version": "v3",
"created": "Fri, 23 May 2008 00:38:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kanamori",
"Issaku",
""
],
[
"Sugino",
"Fumihiko",
""
],
[
"Suzuki",
"Hiroshi",
""
]
] | [
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] |
711.21 | Igor Chilingarian | Igor Chilingarian, Olga Sil'chenko, Victor Afanasiev, Philippe
Prugniel | Low-Luminosity Early-Type Galaxies in the NGC 128 Group | 2 pages, 1 figure, submitted to the proceedings of ``Pathways through
an eclectic Universe''. The original PDF-version of the poster is attached as
well | null | null | null | astro-ph | null | We present spatially resolved kinematics and stellar population parameters
for three low-luminosity galaxies in the NGC128 group obtained by means of 3D
spectroscopy. We briefly discuss their evolutionary scenarii.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 00:45:58 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Chilingarian",
"Igor",
""
],
[
"Sil'chenko",
"Olga",
""
],
[
"Afanasiev",
"Victor",
""
],
[
"Prugniel",
"Philippe",
""
]
] | [
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] |
711.2101 | Nario Kuno | Nario Kuno, Kouichiro Nakanishi, Kazuo Sorai and Toshihito Shibatsuka | Central Spiral Structure of Molecular Gas in Maffei 2 | 7 pages, 10 figures, Publication of Astronomical Society of Japan, in
press | null | 10.1093/pasj/60.3.475 | null | astro-ph | null | Distribution and kinematics of molecular gas in the central region of the
barred spiral galaxy Maffei 2 were investigated using a data set of 12CO(1-0),
12CO(2-1), CS(2-1) lines and 103 GHz continuum. We found that the offset ridges
along the kpc-scale bar continue to the central spiral structure embedded in
the weak oval structure which is regarded as x2 orbit in the bar potential. The
spiral structure continues toward the center diverging from the oval structure.
The size of these structures is less than R ~ 100 pc. The mass concentration
within R = 35 pc is estimated to be 2 X 10^8 Mo. The high mass concentration is
consistent with theoretical predictions concerning the creation of such a
nuclear spiral structure. A comparison with the tracers of dense gas and
star-forming region suggests that the dense molecular gas traced by CS(2-1)
line is formed at the crossing points of x1 and x2 orbits and the star-forming
region appears after 2 X 10^5 yr which is comparable with the free-fall time of
the dense gas traced by the CS line (~ 10^5 cm^-3).
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 01:36:27 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kuno",
"Nario",
""
],
[
"Nakanishi",
"Kouichiro",
""
],
[
"Sorai",
"Kazuo",
""
],
[
"Shibatsuka",
"Toshihito",
""
]
] | [
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] |
711.2102 | Gil Shamir | Gil I. Shamir | Patterns of i.i.d. Sequences and Their Entropy - Part II: Bounds for
Some Distributions | null | null | null | null | cs.IT math.IT | null | A pattern of a sequence is a sequence of integer indices with each index
describing the order of first occurrence of the respective symbol in the
original sequence. In a recent paper, tight general bounds on the block entropy
of patterns of sequences generated by independent and identically distributed
(i.i.d.) sources were derived. In this paper, precise approximations are
provided for the pattern block entropies for patterns of sequences generated by
i.i.d. uniform and monotonic distributions, including distributions over the
integers, and the geometric distribution. Numerical bounds on the pattern block
entropies of these distributions are provided even for very short blocks. Tight
bounds are obtained even for distributions that have infinite i.i.d. entropy
rates. The approximations are obtained using general bounds and their
derivation techniques. Conditional index entropy is also studied for
distributions over smaller alphabets.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 02:13:15 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Shamir",
"Gil I.",
""
]
] | [
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] |
711.2103 | Simon Johnston | Simon Johnston (ATNF, CSIRO), et al | Science With The Australian Square Kilometre Array Pathfinder | Accepted for publication in PASA. 14 pages, 6 figures | PoSMRU:006,2007 | 10.1071/AS07033 | null | astro-ph | null | The future of cm and m-wave astronomy lies with the Square Kilometre Array
(SKA), a telescope under development by a consortium of 17 countries that will
be 50 times more sensitive than any existing radio facility. Most of the key
science for the SKA will be addressed through large-area imaging of the
Universe at frequencies from a few hundred MHz to a few GHz. The Australian SKA
Pathfinder (ASKAP) is a technology demonstrator aimed in the mid-frequency
range, and achieves instantaneous wide-area imaging through the development and
deployment of phased-array feed systems on parabolic reflectors. The large
field-of-view makes ASKAP an unprecedented synoptic telescope that will make
substantial advances in SKA key science. ASKAP will be located at the Murchison
Radio Observatory in inland Western Australia, one of the most radio-quiet
locations on the Earth and one of two sites selected by the international
community as a potential location for the SKA. In this paper, we outline an
ambitious science program for ASKAP, examining key science such as
understanding the evolution, formation and population of galaxies including our
own, understanding the magnetic Universe, revealing the transient radio sky and
searching for gravitational waves.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 02:50:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Johnston",
"Simon",
"",
"ATNF, CSIRO"
]
] | [
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711.2104 | Arthur Cunha | Arthur Cunha, Minh Do, and Martin Vetterli | On the Information Rates of the Plenoptic Function | submitted to IEEE Transactions in Information Theory | null | null | null | cs.IT cs.CV math.IT math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The {\it plenoptic function} (Adelson and Bergen, 91) describes the visual
information available to an observer at any point in space and time. Samples of
the plenoptic function (POF) are seen in video and in general visual content,
and represent large amounts of information. In this paper we propose a
stochastic model to study the compression limits of the plenoptic function. In
the proposed framework, we isolate the two fundamental sources of information
in the POF: the one representing the camera motion and the other representing
the information complexity of the "reality" being acquired and transmitted. The
sources of information are combined, generating a stochastic process that we
study in detail. We first propose a model for ensembles of realities that do
not change over time. The proposed model is simple in that it enables us to
derive precise coding bounds in the information-theoretic sense that are sharp
in a number of cases of practical interest. For this simple case of static
realities and camera motion, our results indicate that coding practice is in
accordance with optimal coding from an information-theoretic standpoint. The
model is further extended to account for visual realities that change over
time. We derive bounds on the lossless and lossy information rates for this
dynamic reality model, stating conditions under which the bounds are tight.
Examples with synthetic sources suggest that in the presence of scene dynamics,
simple hybrid coding using motion/displacement estimation with DPCM performs
considerably suboptimally relative to the true rate-distortion bound.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 02:54:22 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 02:53:30 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Aug 2009 18:11:32 GMT"
}
] | 2009-08-08T00:00:00 | [
[
"Cunha",
"Arthur",
""
],
[
"Do",
"Minh",
""
],
[
"Vetterli",
"Martin",
""
]
] | [
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711.2105 | Kyle Dawson | Kyle Dawson, Chris Bebek, John Emes, Steve Holland, Sharon Jelinsky,
Armin Karcher, William Kolbe, Nick Palaio, Natalie Roe, Juhi Saha, Koki
Takasaki, and Guobin Wang | Radiation Tolerance of Fully-Depleted P-Channel CCDs Designed for the
SNAP Satellite | 11 pages, 10 figures, submitted to IEEE Transactions | IEEE Trans.Nucl.Sci.55:1725-1735,2008 | 10.1109/TNS.2008.919262 | null | astro-ph | null | Thick, fully depleted p-channel charge-coupled devices (CCDs) have been
developed at the Lawrence Berkeley National Laboratory (LBNL). These CCDs have
several advantages over conventional thin, n-channel CCDs, including enhanced
quantum efficiency and reduced fringing at near-infrared wavelengths and
improved radiation tolerance. Here we report results from the irradiation of
CCDs with 12.5 and 55 MeV protons at the LBNL 88-Inch Cyclotron and with 0.1-1
MeV electrons at the LBNL Co60 source. These studies indicate that the LBNL
CCDs perform well after irradiation, even in the parameters in which
significant degradation is observed in other CCDs: charge transfer efficiency,
dark current, and isolated hot pixels. Modeling the radiation exposure over a
six-year mission lifetime with no annealing, we expect an increase in dark
current of 20 e/pixel/hr, and a degradation of charge transfer efficiency in
the parallel direction of 3e-6 and 1e-6 in the serial direction. The dark
current is observed to improve with an annealing cycle, while the parallel CTE
is relatively unaffected and the serial CTE is somewhat degraded. As expected,
the radiation tolerance of the p-channel LBNL CCDs is significantly improved
over the conventional n-channel CCDs that are currently employed in space-based
telescopes such as the Hubble Space Telescope.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 04:06:30 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Dawson",
"Kyle",
""
],
[
"Bebek",
"Chris",
""
],
[
"Emes",
"John",
""
],
[
"Holland",
"Steve",
""
],
[
"Jelinsky",
"Sharon",
""
],
[
"Karcher",
"Armin",
""
],
[
"Kolbe",
"William",
""
],
[
"Palaio",
"Nick",
""
],
[
"Roe",
"Natalie",
""
],
[
"Saha",
"Juhi",
""
],
[
"Takasaki",
"Koki",
""
],
[
"Wang",
"Guobin",
""
]
] | [
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] |
711.2106 | Jonathan Langton | Jonathan Langton and Gregory Laughlin | Hydrodynamic Simulations of Unevenly Irradiated Jovian Planets | 24 pages, 5 figures, 3 tables | null | 10.1086/523957 | null | astro-ph | null | We employ a two-dimensional grid-based hydrodynamic model to simulate upper
atmospheric dynamics on extrasolar giant planets. Our model is well-suited to
simulate the dynamics of the atmospheres of planets with high orbital
eccentricity that are subject to widely-varying irradiation conditions. We
identify six such planets, with eccentricities between $e=0.28$ and $e=0.93$
and semimajor axes ranging from $a=0.0508$ A.U. to $a=0.432$ A.U., as
particularly interesting objects for study. For each of these planets, we
determine the temperature profile and resulting infrared light curves in the
8-$\mu$m Spitzer bands. Especially notable are the results for HD 80606b, which
has the largest eccentricity ($e=0.9321$) of any known planet, and HAT-P-2b,
which transits its parent star, so that its physical properties are
well-constrained. Despite the variety of orbital parameters, the atmospheric
dynamics of these eccentric planets display a number of interesting common
properties. In all cases, the atmospheric response is primarily driven by the
intense irradiation at periastron. The resulting expansion of heated air
produces high-velocity turbulent flow, including long-lived circumpolar
vortices. Additionally, a superrotating acoustic front develops on some
planets; the strength of this disturbance depends on both the eccentricity and
the temperature gradient resulting from uneven heating. The specifics of the
resulting infrared light curves depend strongly on the orbital geometry. We
show, however, that the variations on HD 80606 b and HAT-P-2b should be readily
detectable at 4.5 and 8 $\mu$m using the Spitzer Space Telescope. Indeed, these
two objects present the most attractive observational targets of all known
high-$e$ exoplanets.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 04:31:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Langton",
"Jonathan",
""
],
[
"Laughlin",
"Gregory",
""
]
] | [
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711.2107 | David London | Alakabha Datta, Yanyan Gao, Andrei V. Gritsan, David London, Makiko
Nagashima, Alejandro Szynkman | Study of Polarization in B -> VT Decays | 15 pages, latex, 3 figures (enclosed), several changes made,
conclusions unchanged, publication info added | Phys.Rev.D77:114025,2008 | 10.1103/PhysRevD.77.114025 | UMISS-HEP-2007-04, UdeM-GPP-TH-07-162 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine B -> VT decays (V is a vector and T is a tensor
meson), whose final-state particles can have transverse or longitudinal
polarization. Measurements have been made of B -> \phi K_2^*, and it is found
that fT/fL is small, where fT (fL) is the fraction of transverse (longitudinal)
decays. We find that the standard model (SM) naively predicts that fT/fL << 1.
The two extensions of the naive SM which have been proposed to explain the
large fT/fL in B -> \phi K^* -- penguin annihilation and rescattering -- make
no firm predictions for the polarization in B -> \phi K_2^*. The two
new-physics scenarios, which explain the data in B -> \pi K and the \phi (\rho)
K^* polarization measurements, can reproduce the fT/fL data in B -> \phi K_2^*
only if the B -> T form factors obey a certain hierarchy. Finally, we present
the general angular analysis which can be used to get helicity information
using two- and three-body decays.
| [
{
"version": "v1",
"created": "Wed, 14 Nov 2007 04:36:50 GMT"
},
{
"version": "v2",
"created": "Sat, 28 Jun 2008 04:39:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Datta",
"Alakabha",
""
],
[
"Gao",
"Yanyan",
""
],
[
"Gritsan",
"Andrei V.",
""
],
[
"London",
"David",
""
],
[
"Nagashima",
"Makiko",
""
],
[
"Szynkman",
"Alejandro",
""
]
] | [
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0.0052686334,
0.0817067847,
0.0664760098,
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0.1157116145,
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] |
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