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802.0803 | Levshakov | S. A. Levshakov, I. I. Agafonova, D. Reimers, J. L. Hou, P. Molaro | Quasar spectral energy distribution in EUV restored from associated
absorbers: indications to the HeII opacity of the quasar accretion disk wind | 18 pages, 14 figures, 5 tables, accepted for publication in A&A | null | 10.1051/0004-6361:20079109 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | (abridged) Aims. To reconstruct the spectral shape of the quasar ionizing
radiation in the extreme-UV range (1Ryd <= E < 10Ryd) from the analysis of
narrow absorption lines (NAL) of the associated systems. Methods. Computational
technique for inverse spectroscopic problems - Monte Carlo Inversion augmented
by procedure of the spectral shape recovering and modified to account for the
incomplete coverage of the light source. Results. The ionizing spectra
responsible for the ionization structure of the NAL systems require an
intensity depression at E > 4Ryd which is attributed to the HeII Lyman
continuum opacity (tau^HeII_c ~ 1). A most likely source of this opacity is a
quasar accretion disk wind. The corresponding column density of HI in the wind
is estimated as a few times 10^16 cm^-2. This amount of neutral hydrogen should
cause a weak continuum depression at lamb <= 912A (rest-frame), and a broad and
shallow absorption in HI Ly-alpha. If metallicity of the wind is high enough,
other resonance lines of OVI, NeVI-NeVIII, etc. are expected. In the analyzed
QSO spectra we do observe broad (stretching over 1000s km/s) and shallow (tau
<< 1) absorption troughs of HI Ly-alpha and OVI 1031,1037A...
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:10:01 GMT"
}
] | 2018-10-24T00:00:00 | [
[
"Levshakov",
"S. A.",
""
],
[
"Agafonova",
"I. I.",
""
],
[
"Reimers",
"D.",
""
],
[
"Hou",
"J. L.",
""
],
[
"Molaro",
"P.",
""
]
] | [
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802.0804 | Cristina Martin-Puig MSc. | C. Martin-Puig, J. Marquez, G. Ruffini, R.K. Raney, J. Benveniste | SAR Altimetry Applications over Water | Submitted to SeaSAR 2008 proceedings | null | null | null | physics.ao-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The application of Synthetic Aperture Radar (SAR) techniques to classical
radar altimetry offers the potential for greatly improved Earth surface
mapping. This paper provides an overview of the progress of SAMOSA, Development
of SAR Altimetry Studies and Applications over Ocean, Coastal zones and Inland
waters, an on-going ESA-funded project. The main objective of SAMOSA is to
better quantify the improvement of SAR altimetry over conventional altimetry on
water surfaces. More specifically, one of the tasks focuses on the reduction of
SAR mode data to pulse-limited altimeter data, and a theoretical modelling to
characterize the expected gain between high Pulse Repetition Frequency (PRF)
reduced SAR mode data and low PRF classical Low-Resolution Mode (LRM) data. To
this end, theoretical modelling using the Cramer-Rao bound (CRB) will be used
and the results will be compared to previous theoretical estimates [7], using
an analysis akin to that in [8].
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:13:19 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Martin-Puig",
"C.",
""
],
[
"Marquez",
"J.",
""
],
[
"Ruffini",
"G.",
""
],
[
"Raney",
"R. K.",
""
],
[
"Benveniste",
"J.",
""
]
] | [
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802.0805 | Marcos Dajczer | Marcos Dajczer Ruy Tojeiro | Submanifolds of codimension two attaining equality in an extrinsic
inequality | null | null | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a parametric construction in terms of minimal surfaces of the
Euclidean submanifolds of codimension two and arbitrary dimension that attain
equality in an inequality due to De Smet, Dillen, Verstraelen and Vrancken. The
latter involves the scalar curvature, the norm of the normal curvature tensor
and the length of the mean curvature vector.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:18:30 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Tojeiro",
"Marcos Dajczer Ruy",
""
]
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] |
802.0806 | Richard Hain | Richard Hain, Makoto Matsumoto | Relative Pro-$\ell$ Completions of Mapping Class Groups | A few minor changes. Will appear in Lehrer volume of J. Algebra | null | null | null | math.NT math.AG math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fix a prime number ell. In this paper we develop the theory of relative
pro-ell completion of discrete and profinite groups -- a natural generalization
of the classical notion of pro-ell completion -- and show that the pro-ell
completion of the Torelli group does not inject into the relative pro-ell
completion of the corresponding mapping class group when the genus is at least
3. As an application, we prove that when g > 2, the action of the pro-ell
completion of the Torelli group T_{g,1} on the pro-ell fundamental group of a
pointed genus g surface is not faithful.
The choice of a first-order deformation of a maximally degenerate stable
curve of genus g determines an action of the absolute Galois group G_Q on the
relative pro-ell completion of the corresponding mapping class group. We prove
that for all g all such representations are unramified at all primes \neq ell
when the first order deformation is suitably chosen. This proof was
communicated to us by Mochizuki and Tamagawa.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:21:45 GMT"
},
{
"version": "v2",
"created": "Sun, 19 Oct 2008 23:42:07 GMT"
},
{
"version": "v3",
"created": "Wed, 11 Feb 2009 20:27:40 GMT"
},
{
"version": "v4",
"created": "Wed, 18 Feb 2009 21:34:59 GMT"
}
] | 2009-02-18T00:00:00 | [
[
"Hain",
"Richard",
""
],
[
"Matsumoto",
"Makoto",
""
]
] | [
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] |
802.0807 | Romain Monchaux | Romain Monchaux and Pierre-Philippe Cortet and Pierre-Henri Chavanis
and Arnaud Chiffaudel and Fran\c{c}ois Daviaud and Pantxo Diribarne and
B\'ereng\`ere Dubrulle | Fluctuation-Dissipation Relations and statistical temperatures in a
turbulent von K\'arm\'an flow | four pages 2 figures one table | Phys.Rev.Lett.101:174502,2008 | 10.1103/PhysRevLett.101.174502 | null | physics.flu-dyn cond-mat.stat-mech physics.acc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We experimentally characterize the fluctuations of the non-homogeneous
non-isotropic turbulence in an axisymmetric von K\'arm\'an flow. We show that
these fluctuations satisfy relations analogous to classical
Fluctuation-Dissipation Relations (FDRs) in statistical mechanics. We use these
relations to measure statistical temperatures of turbulence. The values of
these temperatures are found to be dependent on the considered observable as
already evidenced in other far from equilibrium systems.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:22:51 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Sep 2008 08:21:49 GMT"
}
] | 2009-01-30T00:00:00 | [
[
"Monchaux",
"Romain",
""
],
[
"Cortet",
"Pierre-Philippe",
""
],
[
"Chavanis",
"Pierre-Henri",
""
],
[
"Chiffaudel",
"Arnaud",
""
],
[
"Daviaud",
"François",
""
],
[
"Diribarne",
"Pantxo",
""
],
[
"Dubrulle",
"Bérengère",
""
]
] | [
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] |
802.0808 | Fabio G. Guerrero Moreno | Fabio G. Guerrero, Maribell Sacanamboy | Turbo Interleaving inside the cdma2000 and W-CDMA Mobile Communication
Systems: A Tutorial | null | null | null | null | cs.IT math.IT | null | In this paper a discussion of the detailed operation of the interleavers used
by the turbo codes defined on the telecommunications standards cdma2000 (3GPP2
C.S0024-B V2.0) and W-CDMA (3GPP TS 25.212 V7.4.0) is presented. Differences in
the approach used by each turbo interleaver as well as dispersion analysis and
frequency analysis are also discussed. Two examples are presented to illustrate
the complete interleaving process defined by each standard. These two
interleaving approaches are also representative for other communications
standards.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:38:35 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Guerrero",
"Fabio G.",
""
],
[
"Sacanamboy",
"Maribell",
""
]
] | [
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] |
802.0809 | Zhou Zhang | X. X. Chen, G. Tian, Z. Zhang | On the weak K\"ahler-Ricci flow | 18 pages, tex file | null | null | null | math.DG math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we define and study K\"ahler-Ricci flow with initial data not
being smooth with some natural applications.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:24:55 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Chen",
"X. X.",
""
],
[
"Tian",
"G.",
""
],
[
"Zhang",
"Z.",
""
]
] | [
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] |
802.081 | Tolga Etg\"u | Tolga Etg\"u and Burak Ozbagci | On the relative Giroux correspondence | 17 pages, 8 figures, used to be part of arxiv:0711.0880 | Low-dimensional and symplectic topology, 65-78, Proceedings of
Symposia in Pure Mathematics, 82, American Mathematical Society, 2011 | null | null | math.GT math.SG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Honda, Kazez and Matic described an adapted partial open book of a
compact contact 3-manifold with convex boundary by generalizing the work of
Giroux in the closed case. They also implicitly established a one-to-one
correspondence between isomorphism classes of partial open book decompositions
modulo positive stabilization and isomorphism classes of compact contact
3-manifolds with convex boundary. In this expository article we explicate the
relative version of Giroux correspondence.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:33:20 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Apr 2012 08:11:57 GMT"
}
] | 2012-04-12T00:00:00 | [
[
"Etgü",
"Tolga",
""
],
[
"Ozbagci",
"Burak",
""
]
] | [
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] |
802.0811 | John Morton | John J. L. Morton, Archana Tiwari, Geraldine Dantelle, Kyriakos
Porfyrakis, Arzhang Ardavan and G. Andrew D. Briggs | Switchable ErSc2N rotor within a C80 fullerene cage: An EPR and
photoluminescence excitation study | 4 pages, 4 figures | null | 10.1103/PhysRevLett.101.013002 | null | cond-mat.mtrl-sci | null | Systems exhibiting both spin and orbital degrees of freedom, of which Er3+ is
one, can offer mechanisms for manipulating and measuring spin states via
optical excitations. Motivated by the possibility of observing
photoluminescence and electron paramagnetic resonance from the same species
located within a fullerene molecule, we initiated an EPR study of Er3+ in
ErSc2N@C80. Two orientations of the ErSc2N rotor within the C80 fullerene are
observed in EPR, consistent with earlier studies using photoluminescence
excitation (PLE) spectroscopy. For some crystal field orientations, electron
spin relaxation is driven by an Orbach process via the first excited electronic
state of the 4I_15/2 multiplet. We observe a change in the relative populations
of the two ErSc2N configurations upon the application of 532 nm illuminations,
and are thus able to switch the majority cage symmetry. This
photoisomerisation, observable by both EPR and PLE, is metastable, lasting many
hours at 20 K.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:58:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Morton",
"John J. L.",
""
],
[
"Tiwari",
"Archana",
""
],
[
"Dantelle",
"Geraldine",
""
],
[
"Porfyrakis",
"Kyriakos",
""
],
[
"Ardavan",
"Arzhang",
""
],
[
"Briggs",
"G. Andrew D.",
""
]
] | [
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802.0812 | Marche Julien | Julien Marche | The Kauffman skein algebra of a surface at $\sqrt{-1}$ | 16 pages, 2 figures | null | null | null | math.GT math.QA | null | We study the structure of the Kauffman algebra of a surface with parameter
equal to sqrt(-1). We obtain an interpretation of this algebra as an algebra of
parallel transport operators acting on sections of a line bundle over the
moduli space of flat connections in a trivial SU(2)-bundle over the surface. We
analyse the asymptotics of traces of curve-operators in TQFT in non standard
regimes where the root of unity parametrizing the TQFT accumulates to a root of
unity. We interpret the case of sqrt(-1) in terms of parallel transport
operators.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:50:28 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Marche",
"Julien",
""
]
] | [
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] |
802.0813 | Thomas Gehrmann | A. Gehrmann-De Ridder, T. Gehrmann, E.W.N. Glover, G. Heinrich | Jet rates in electron-positron annihilation at O(\alpha_s^3) in QCD | 4 pages, 2 figures, extended discussion on scale uncertainty, added
references | Phys.Rev.Lett.100:172001,2008 | 10.1103/PhysRevLett.100.172001 | ZU-TH 03/08, IPPP/08/05 | hep-ph | null | We compute production rates for two, three, four and five jets in
electron-positron annihilation at the third order in the QCD coupling constant.
At this order, three-jet production is described to next-to-next-to-leading
order (NNLO) in perturbation theory while the two-jet rate is obtained at
next-to-next-to-next-to-leading order (N$^3$LO). Our results yield an improved
perturbative description of the dependence of jet multiplicity on the jet
resolution parameter, $\ycut$, particularly at small values of $\ycut$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:40:45 GMT"
},
{
"version": "v2",
"created": "Mon, 31 Mar 2008 14:03:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ridder",
"A. Gehrmann-De",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Heinrich",
"G.",
""
]
] | [
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] |
802.0814 | Richard Hain | Richard Hain | Relative Weight Filtrations on Completions of Mapping Class Groups | null | null | null | null | math.GT math.AG math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper gives an exposition of relative weight filtrations on completions
of mapping class groups associated to a stable degeneration of marked genus g
curves. These relative weight filtrations have been constructed using Galois
theory (with Matsumoto) and Hodge theory (with Pearlstein and Terasoma). It is
shown that the level 0 part of the relative weight filtration is an analogue of
a parabolic subalgebra of a Kac-Moody Lie algebra. It is shown that all such
subalgebras correspond to equivalence classes of pants decompositions of the
surface -- two being equivalent if and only if they determine the same
handlebody that the reference surface bounds. One application is to show that
handlebody subgroups of mapping class groups contain elements arbitrarily far
down the lower central series of Torelli groups. (This result was also obtained
independently by Jamie Jorgensen.)
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:38:50 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Hain",
"Richard",
""
]
] | [
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802.0815 | Dr Paul A. Crowther | J. L. Bibby (Sheffield), P. A. Crowther (Sheffield), J. P. Furness
(Sheffield), J. S. Clark (Open University) | A downward revision to the distance of the 1806-20 cluster and
associated magnetar from Gemini near-Infrared spectroscopy | 6 pages, 4 figures, accepted for MNRAS Letters | Mon.Not.Roy.Astron.Soc.386:L23-L27,2008 | 10.1111/j.1745-3933.2008.00453.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present H- and K-band spectroscopy of OB and Wolf-Rayet (WR) members of
the Milky Way cluster 1806-20 (G10.0-0.3), to obtain a revised cluster distance
of relevance to the 2004 giant flare from the SGR 1806-20 magnetar. From GNIRS
spectroscopy obtained with Gemini South, four candidate OB stars are confirmed
as late O/early B supergiants, while we support previous mid WN and late WC
classifications for two WR stars. Based upon an absolute Ks-band magnitude
calibration for B supergiants and WR stars, and near-IR photometry from NIRI at
Gemini North plus archival VLT/ISAAC datasets, we obtain a cluster distance
modulus of 14.7+/-0.35 mag. The known stellar content of the 1806-20 cluster
suggests an age of 3-5 Myr, from which theoretical isochrone fits infer a
distance modulus of 14.7+/-0.7 mag. Together, our results favour a distance
modulus of 14.7+/-0.4 mag (8.7^+1.8_-1.5 kpc) to the 1806-20 cluster, which is
significantly lower than the nominal 15 kpc distance to the magnetar. For our
preferred distance, the peak luminosity of the December 2004 giant flare is
reduced by a factor of three to 7 X 10^46 erg/s, such that the contamination of
BATSE short gamma ray bursts (GRB's) from giant flares of extragalactic
magnetars is reduced to a few percent. We infer a magnetar progenitor mass of
~48^+20_-8 Msun, in close agreement with that obtained recently for the
magnetar in Westerlund 1.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 14:39:53 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bibby",
"J. L.",
"",
"Sheffield"
],
[
"Crowther",
"P. A.",
"",
"Sheffield"
],
[
"Furness",
"J. P.",
"",
"Sheffield"
],
[
"Clark",
"J. S.",
"",
"Open University"
]
] | [
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802.0816 | David Russell | David Russell (University of Southampton) | Optical and infrared emission from discs, jets and nebulae associated
with X-ray binaries | Ph.D. Thesis (awarded November 2007, University of Southampton), 183
pages, 52 figures. A pdf with full-resolution figures is at
http://staff.science.uva.nl/~davidr/publications/Russell-PhD-thesis.pdf It
will also be available from the British Library Public Catalogue:
http://catalogue.bl.uk/ | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | X-ray binaries are binary star systems in which a compact object (a neutron
star or a black hole) and a relatively normal star orbit a common centre of
mass. Since the discovery of X-ray binaries with the first X-ray telescopes in
the 1960s, astronomers have tried to understand how these bizarre objects
behave, and why. Some change in X-ray luminosity by 10^8 orders of magnitude on
timescales of days to months due to an increased transfer of mass from the star
towards the compact object. Many X-ray binaries are detected at all observable
frequencies, from radio to gamma-rays. It has been found that many different
sources of emission, which peak at different frequencies, are present in X-ray
binary spectra and together they produce the observed broadband spectrum.
However, disentangling these components has proved challenging. Much of the
work in this thesis concerns disentangling the components that occupy the
optical and near-infrared (NIR) region of the spectrum of X-ray binaries;
possibly the region in which the relative contributions of the different
components are least certain. In particular one component, the synchrotron
emission from jets of outflowing matter, is found in this work to contribute
ubiquitously to the optical and NIR light of X-ray binaries with relatively
faint stars. These results confirm that the jets are powerful and in some of
this work, observations of the jets interacting with the surrounding matter are
used to infer their power.
| [
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] |
802.0817 | Anne Philippe | Dmitrij Celov, Remigijus Leipus, Anne Philippe (LMJL) | Asymptotic normality of the mixture density estimator in a
disaggregation scheme | null | null | null | null | math.ST stat.TH | null | The paper concerns the asymptotic distribution of the mixture density
estimator, proposed by Oppenheim et al 2006, in the aggregation/disaggregation
problem of random parameter AR(1) process. We prove that, under mild conditions
on the (semiparametric) form of the mixture density, the estimator is
asymptotically normal. The proof is based on the limit theory for the quadratic
form in linear random variables developed by Bhansali et al 2007. The moving
average representation of the aggregated process is investigated. A small
simulation study illustrates the result.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:01:17 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Celov",
"Dmitrij",
"",
"LMJL"
],
[
"Leipus",
"Remigijus",
"",
"LMJL"
],
[
"Philippe",
"Anne",
"",
"LMJL"
]
] | [
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] |
802.0818 | Massimo Persic | M.Persic (INAF/INFN Trieste), Y.Rephaeli (Tel-Aviv U., UCSD), Y.Arieli
(Tel-Aviv U.) | VHE emission from M82 | A&A, in press. 8 pages, 3 figures | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spurred by the improved measurement sensitivity in the very-high-energy (VHE:
>100 GeV) gamma-ray band, we assess the feasibility of detection of the nearby
starburst galaxy M82. VHE emission is expected to be predominantly from the
decay of neutral pions which are produced in energetic proton interactions with
ambient protons. An estimate of VHE emission from this process is obtained by
an approximate, semi-quantitative calculation, and also by a detailed numerical
treatment based on a convection-diffusion model for energetic electron and
proton propagation and energy losses. All relevant hadronic and leptonic
processes are considered, gauged by the measured synchrotron radio emission
from the inner disk region. We estimate an integrated flux f(>100 GeV) 2E-12
1/(cm^2 s), possibly detectable by the current northern-hemisphere imaging air
Cherenkov telescopes, MAGIC and VERITAS, and a good candidate for detection
with the upcoming MAGIC II telescope. We also estimate f(>100 MeV) E-8 1/(cm^2
s), a level of emission that can be detected by GLAST/LAT based on the
projected sensitivity for a one-year observation.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:05:02 GMT"
},
{
"version": "v2",
"created": "Fri, 23 May 2008 13:50:52 GMT"
}
] | 2008-05-23T00:00:00 | [
[
"Persic",
"M.",
"",
"INAF/INFN Trieste"
],
[
"Rephaeli",
"Y.",
"",
"Tel-Aviv U., UCSD"
],
[
"Arieli",
"Y.",
"",
"Tel-Aviv U."
]
] | [
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] |
802.0819 | Gavin Ramsay | O. B. Slee (1), W. Wilson (1), G. Ramsay (2), ((1) ATNF, Epping,
Australia, (2) Armagh Observatory, Northern Ireland) | The Coherent Radio Emission from the RS CVn Binary HR 1099 | Accepted for publication in the Publications of the Astronomical
Society of Australia | null | 10.1071/AS07045 | null | astro-ph | null | We used the Australia Telescope in March-April 2005 to observe the RS CVn
binary HR 1099 at 1.384 and 2.368 GHz at two epochs, each of 9 h in duration
and 11 days apart. During two episodes of coherent emission, we employed a
recently installed facility to sample the data at 78 ms intervals to measure
the fine temporal and spectral structure of HR 1099. Our main observational
results include: ~100% left hand circularly polarised emission was seen at both
1.384 and 2.368 GHz during both epochs; in the first event the emission feature
drifted across the spectrum; three 22 min integrations made at 78 ms time
resolution showed that the modulation index of the Stokes V parameter increased
monotonically as the integration time was decreased and was still increasing at
our resolution limit; we believe that the highly polarised emission is due to
electron-cyclotron maser emission (ECME) operating in the corona of one of the
binary components. We discuss two kinds of maser sources that may be
responsible for driving the observed events. We suggest that the ECME source
may be an aurora-like phenomenon due to the transfer of plasma from the K2
subgiant to the G5 dwarf in a strong stellar wind.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:17:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Slee",
"O. B.",
""
],
[
"Wilson",
"W.",
""
],
[
"Ramsay",
"G.",
""
]
] | [
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] |
802.082 | Jonathan Hayman | Jonathan Hayman and Glynn Winskel | Independence and concurrent separation logic | null | Logical Methods in Computer Science, Volume 4, Issue 1 (March 19,
2008) lmcs:1100 | 10.2168/LMCS-4(1:6)2008 | null | cs.LO cs.PL | null | A compositional Petri net-based semantics is given to a simple language
allowing pointer manipulation and parallelism. The model is then applied to
give a notion of validity to the judgements made by concurrent separation logic
that emphasizes the process-environment duality inherent in such rely-guarantee
reasoning. Soundness of the rules of concurrent separation logic with respect
to this definition of validity is shown. The independence information retained
by the Petri net model is then exploited to characterize the independence of
parallel processes enforced by the logic. This is shown to permit a refinement
operation capable of changing the granularity of atomic actions.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:39:20 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Mar 2008 15:26:51 GMT"
}
] | 2015-07-01T00:00:00 | [
[
"Hayman",
"Jonathan",
""
],
[
"Winskel",
"Glynn",
""
]
] | [
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] |
802.0821 | Shai Kaspi | Noah Brosch, David Polishook, Avi Shporer, Shai Kaspi, Assaf Berwald,
and Ilan Manulis | The Centurion 18 telescope of the Wise Observatory | 16 pages, 13 figures, some figures quality was degraded, accepted for
publication in Astrophysics and Space Science | Astrophys.Space Sci.314:163-176,2008 | 10.1007/s10509-008-9752-4 | null | astro-ph | null | We describe the second telescope of the Wise Observatory, a 0.46-m Centurion
18 (C18) installed in 2005, which enhances significantly the observing
possibilities. The telescope operates from a small dome and is equipped with a
large-format CCD camera. In the last two years this telescope was intensively
used in a variety of monitoring projects.
The operation of the C18 is now automatic, requiring only start-up at the
beginning of a night and close-down at dawn. The observations are mostly
performed remotely from the Tel Aviv campus or even from the observer's home.
The entire facility was erected for a component cost of about 70k$ and a labor
investment of a total of one man-year.
We describe three types of projects undertaken with this new facility: the
measurement of asteroid light variability with the purpose of determining
physical parameters and binarity, the following-up of transiting extrasolar
planets, and the study of AGN variability. The successful implementation of the
C18 demonstrates the viability of small telescopes in an age of huge
light-collectors, provided the operation of such facilities is very efficient.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:04:54 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Brosch",
"Noah",
""
],
[
"Polishook",
"David",
""
],
[
"Shporer",
"Avi",
""
],
[
"Kaspi",
"Shai",
""
],
[
"Berwald",
"Assaf",
""
],
[
"Manulis",
"Ilan",
""
]
] | [
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] |
802.0822 | Guihua Chen | Zhifeng Chen, Chengguang Bao, Zhibing Li | Effect of magnetic fields on the spin evolution of non-polarized 87Rb
Bose-Einstein condensates | 9 pages, 7 figures | null | null | null | cond-mat.other | null | The spin mixing dynamics of spin-1 Bose-Einstein condensates with zero
magnetization and under an external magnetic field is investigated. The
time-dependent solutions are obtained via a diagonalization of the Hamiltonian,
which has a simple form under the single mode approximation. The features of
evolution are compared in detail with those with the field removed so as to
emphasize the effect of the field, which can induce strong oscillation in
population of atoms in spin component 0 . A new mode of oscillation
characterized by a high frequency and a low frequency, is found when the field
is sufficiently strong.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:29:16 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 16:32:23 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Feb 2008 08:08:19 GMT"
}
] | 2008-02-15T00:00:00 | [
[
"Chen",
"Zhifeng",
""
],
[
"Bao",
"Chengguang",
""
],
[
"Li",
"Zhibing",
""
]
] | [
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] |
802.0823 | Marco Chiani Dr. | Enrico Paolini, Marc Fossorier, Marco Chiani | Doubly-Generalized LDPC Codes: Stability Bound over the BEC | Submitted to IEEE Trans. on Inform. Theory | IEEE Trans. Inform. Theory, vol. 55, no. 3, pp. 1027-1046, March
2009 | 10.1109/TIT.2008.2011446 | null | cs.IT math.IT | null | The iterative decoding threshold of low-density parity-check (LDPC) codes
over the binary erasure channel (BEC) fulfills an upper bound depending only on
the variable and check nodes with minimum distance 2. This bound is a
consequence of the stability condition, and is here referred to as stability
bound. In this paper, a stability bound over the BEC is developed for
doubly-generalized LDPC codes, where the variable and the check nodes can be
generic linear block codes, assuming maximum a posteriori erasure correction at
each node. It is proved that in this generalized context as well the bound
depends only on the variable and check component codes with minimum distance 2.
A condition is also developed, namely the derivative matching condition, under
which the bound is achieved with equality.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:29:14 GMT"
}
] | 2010-07-28T00:00:00 | [
[
"Paolini",
"Enrico",
""
],
[
"Fossorier",
"Marc",
""
],
[
"Chiani",
"Marco",
""
]
] | [
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] |
802.0824 | Catherine Quilliet | Catherine Quilliet (LSP, SCM), Carmen Zoldesi (SCM), Christophe Riera,
Alfons Van Blaaderen (SCM), Arnout Imhof (SCM) | Anisotropic colloids through non-trivial buckling | submitted to EPJE | European Journal of Physics 27, 1 (2009) 13 | 10.1140/epje/i2007-10365-2 | null | cond-mat.soft | null | We present a study on buckling of colloidal particles, including
experimental, theoretical and numerical developments. Oil-filled thin shells
prepared by emulsion templating show buckling in mixtures of water and ethanol,
due to dissolution of the core in the external medium. This leads to
conformations with a single depression, either axisymmetric or polygonal
depending on the geometrical features of the shells. These conformations could
be theoretically and/or numerically reproduced in a model of homogeneous
spherical thin shells with bending and stretching elasticity, submitted to an
isotropic external pressure.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:31:53 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Feb 2008 16:33:34 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Feb 2008 15:26:11 GMT"
}
] | 2009-05-14T00:00:00 | [
[
"Quilliet",
"Catherine",
"",
"LSP, SCM"
],
[
"Zoldesi",
"Carmen",
"",
"SCM"
],
[
"Riera",
"Christophe",
"",
"SCM"
],
[
"Van Blaaderen",
"Alfons",
"",
"SCM"
],
[
"Imhof",
"Arnout",
"",
"SCM"
]
] | [
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] |
802.0825 | Stefano Bianchi | Stefano Bianchi, Marco Chiaberge, Enrico Piconcelli, Matteo Guainazzi,
Giorgio Matt | Chandra unveils a binary Active Galactic Nucleus in Mrk463 | 7 pages, 7 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13078.x | null | astro-ph | null | We analyse Chandra, XMM-Newton and HST data of the double-nucleus
Ultraluminous Infrared Galaxy (ULIRG), Mrk463. The Chandra detection of two
luminous ($\mathrm{L}_\mathrm{2-10 keV}=1.5\times10^{43}$ and
$3.8\times10^{42}$ erg cm$^{-2}$ s$^{-1}$), unresolved nuclei in Mrk~463
indicates that this galaxy hosts a binary AGN, with a projected separation of
$\simeq3.8$ kpc ($3.83\pm0.01$ arcsec). While the East nucleus was already
known to be a Seyfert 2 (and this is further confirmed by our Chandra detection
of a neutral iron line), this is the first unambiguous evidence in favour of
the AGN nature of the West nucleus. Mrk463 is therefore the clearest case so
far for a binary AGN, after NGC6240.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:15:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bianchi",
"Stefano",
""
],
[
"Chiaberge",
"Marco",
""
],
[
"Piconcelli",
"Enrico",
""
],
[
"Guainazzi",
"Matteo",
""
],
[
"Matt",
"Giorgio",
""
]
] | [
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] |
802.0826 | Olivier Ley | Jerome Bolte (EC, CMAP), Aris Daniilidis (LMPT), Olivier Ley (LMPT),
Laurent Mazet (LAMA) | Characterizations of Lojasiewicz inequalities and applications | null | null | null | null | math.OC math.DS | null | The classical Lojasiewicz inequality and its extensions for partial
differential equation problems (Simon) and to o-minimal structures (Kurdyka)
have a considerable impact on the analysis of gradient-like methods and related
problems: minimization methods, complexity theory, asymptotic analysis of
dissipative partial differential equations, tame geometry. This paper provides
alternative characterizations of this type of inequalities for nonsmooth lower
semicontinuous functions defined on a metric or a real Hilbert space. In a
metric context, we show that a generalized form of the Lojasiewicz inequality
(hereby called the Kurdyka-Lojasiewicz inequality) relates to metric regularity
and to the Lipschitz continuity of the sublevel mapping, yielding applications
to discrete methods (strong convergence of the proximal algorithm). In a
Hilbert setting we further establish that asymptotic properties of the semiflow
generated by $-\partial f$ are strongly linked to this inequality. This is done
by introducing the notion of a piecewise subgradient curve: such curves have
uniformly bounded lengths if and only if the Kurdyka-Lojasiewicz inequality is
satisfied. Further characterizations in terms of talweg lines -a concept linked
to the location of the less steepest points at the level sets of $f$- and
integrability conditions are given. In the convex case these results are
significantly reinforced, allowing in particular to establish the asymptotic
equivalence of discrete gradient methods and continuous gradient curves. On the
other hand, a counterexample of a convex C^2 function in in the plane is
constructed to illustrate the fact that, contrary to our intuition, and unless
a specific growth condition is satisfied, convex functions may fail to fulfill
the Kurdyka-Lojasiewicz inequality.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:35:28 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Bolte",
"Jerome",
"",
"EC, CMAP"
],
[
"Daniilidis",
"Aris",
"",
"LMPT"
],
[
"Ley",
"Olivier",
"",
"LMPT"
],
[
"Mazet",
"Laurent",
"",
"LAMA"
]
] | [
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] |
802.0827 | Rocco Duvenhage | Rocco Duvenhage | Joinings of W*-dynamical systems | 11 pages | J. Math. Anal. Appl. 343 (2008) 175--181 | 10.1016/j.jmaa.2008.01.056 | null | math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the notion of joinings of W*-dynamical systems, building on ideas
from measure theoretic ergodic theory. In particular we prove sufficient and
necessary conditions for ergodicity in terms of joinings, and also briefly look
at conditional expectation operators associated with joinings.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:37:09 GMT"
}
] | 2008-12-05T00:00:00 | [
[
"Duvenhage",
"Rocco",
""
]
] | [
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] |
802.0828 | Mahir S. Hussein | J. X. de Carvalho, M. S. Hussein and Weibin Li | The Invisible Quantum Barrier | 12 pages, 5 figures; This submission has been withdrawn by the
authors. | null | 10.1103/PhysRevA.78.032906 | null | physics.atom-ph nucl-th | null | We construct the invisible quantum barrier which represents the phenomenon of
quantum reflection using the available data. We use the Abel equation to invert
the data. The resulting invisible quantum barrier is double-valued in both
axes. We study this invisible barrier in the case of atom and Bose-Einstein
Condensate reflection from a solid silicon surface. A time-dependent,
one-spatial dimension Gross-Pitaevskii equation is solved for the BEC case. We
found that the BEC behaves very similarly to the single atom except for size
effects, which manifest themselves in a maximum in the reflectivity at small
distances from the wall. The effect of the atom-atom interaction on the BEC
reflection and correspondingly on the invisible barrier is found to be
appreciable at low velocities and comparable to the finite size effect. The
trapping of ultracold atoms or BEC between two walls is discussed.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:48:56 GMT"
},
{
"version": "v2",
"created": "Sun, 10 Feb 2008 19:17:03 GMT"
},
{
"version": "v3",
"created": "Sat, 16 Feb 2008 16:50:09 GMT"
},
{
"version": "v4",
"created": "Sat, 8 May 2010 15:08:44 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"de Carvalho",
"J. X.",
""
],
[
"Hussein",
"M. S.",
""
],
[
"Li",
"Weibin",
""
]
] | [
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] |
802.0829 | Seiji Yunoki | S. Yunoki, E. Dagotto, S. Costamagna, and J. A. Riera | Large Magnetoresistance in a Manganite Spin-Tunnel-Junction Using LaMnO3
as Insulating Barrier | 14 pages, 18 figures | null | 10.1103/PhysRevB.78.024405 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spin-tunnel-junction based on manganites, with La$_{1-x}$Sr$_x$MnO$_3$
(LSMO) as ferromagnetic metallic electrodes and the undoped parent compound
LaMnO$_3$ (LMO) as insulating barrier, is here theoretically discussed using
double exchange model Hamiltonians and numerical techniques. For an even number
of LMO layers, the ground state is shown to have anti-parallel LSMO magnetic
moments. This highly resistive, but fragile, state is easily destabilized by
small magnetic fields, which orient the LSMO moments in the direction of the
field. The magnetoresistance associated with this transition is very large,
according to Monte Carlo and Density Matrix Renormalization Group studies. The
influence of temperature, the case of an odd number of LMO layers, and the
differences between LMO and SrTiO$_3$ as barriers are also addressed. General
trends are discussed.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:53:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yunoki",
"S.",
""
],
[
"Dagotto",
"E.",
""
],
[
"Costamagna",
"S.",
""
],
[
"Riera",
"J. A.",
""
]
] | [
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] |
802.083 | Nikolai Krasnikov | N.V.Krasnikov | LHC signatures for Z` models with continuously distributed mass | 7 pages | Mod.Phys.Lett.A23:3233-3237,2008 | 10.1142/S0217732308028582 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss phenomenological consequences of renormalizable Z` models with
continuously distributed mass. We point out that one of possible LHC signatures
for such nodel is the existence of broad resonance in Drell-Yan reaction $pp
\to Z^{`} \to l^+l^-$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:59:25 GMT"
}
] | 2009-02-11T00:00:00 | [
[
"Krasnikov",
"N. V.",
""
]
] | [
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] |
802.0831 | Klaus Morawetz | Pavel Lipavsk\'y, Klaus Morawetz, Jan Kol\'a\v{c}ek and Ernst Helmut
Brandt | Surface deformation caused by the Abrikosov vortex lattice | null | Phys. Rev. B 77, 184509-1-7 (2008) | 10.1103/PhysRevB.77.184509 | null | cond-mat.supr-con cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In superconductors penetrated by Abrikosov vortices the magnetic pressure and
the inhomogeneous condensate density induce a deformation of the ionic lattice.
We calculate how this deformation corrugates the surface of a semi-infinite
sample. The effect of the surface dipole is included.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:01:47 GMT"
}
] | 2011-12-15T00:00:00 | [
[
"Lipavský",
"Pavel",
""
],
[
"Morawetz",
"Klaus",
""
],
[
"Koláček",
"Jan",
""
],
[
"Brandt",
"Ernst Helmut",
""
]
] | [
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] |
802.0832 | Jaap-Henk Hoepman | Jaap-Henk Hoepman | Distributed Double Spending Prevention | 15th Int. Workshop on Security Protocols, 2007 (to appear) | null | null | null | cs.CR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the problem of preventing double spending in electronic payment
schemes in a distributed fashion. This problem occurs, for instance, when the
spending of electronic coins needs to be controlled by a large collection of
nodes (eg. in a peer-to-peer (P2P) system) instead of one central bank.
Contrary to the commonly held belief that this is fundamentally impossible, we
propose several solutions that do achieve a reasonable level of double spending
prevention, and analyse their efficiency under varying assumptions.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:09:24 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Hoepman",
"Jaap-Henk",
""
]
] | [
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] |
802.0833 | Lin Xia | Lin Xia, Fan Yang, Xiaoji Zhou and Xuzong Chen | The inherent fluctuations of the pulsed atom laser in F=2 manifold of
87Rb atoms | 5 pages, 6 figures | null | null | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have observed the intensity fluctuations of the F=2 87Rb atom laser at low
output coupling rate. Theoretically, we find that the atom loss of the
condensate due to the output of atom laser leads to fluctuations of the laser
pulses, which is inherent in all state changing out-coupling such as rf and
Raman. Another reason leading to large fluctuations is the interference of
output pulses.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 15:16:17 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 14:31:59 GMT"
},
{
"version": "v3",
"created": "Wed, 29 Oct 2008 07:13:03 GMT"
}
] | 2008-10-29T00:00:00 | [
[
"Xia",
"Lin",
""
],
[
"Yang",
"Fan",
""
],
[
"Zhou",
"Xiaoji",
""
],
[
"Chen",
"Xuzong",
""
]
] | [
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] |
802.0834 | Jaap-Henk Hoepman | Jaap-Henk Hoepman | The Ephemeral Pairing Problem | null | In 8th Int. Conf. Financial Cryptography, LNCS 3110, pages
212-226, Key West, FL, USA, February 9-12 2004. Springer | null | null | cs.CR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In wireless ad-hoc broadcast networks the pairing problem consists of
establishing a (long-term) connection between two specific physical nodes in
the network that do not yet know each other. We focus on the ephemeral version
of this problem. Ephemeral pairings occur, for example, when electronic
business cards are exchanged between two people that meet, or when one pays at
a check-out using a wireless wallet.
This problem can, in more abstract terms, be phrased as an ephemeral key
exchange problem: given a low bandwidth authentic (or private) communication
channel between two nodes, and a high bandwidth broadcast channel, can we
establish a high-entropy shared secret session key between the two nodes
without relying on any a priori shared secret information.
Apart from introducing this new problem, we present several ephemeral key
exchange protocols, both for the case of authentic channels as well as for the
case of private channels.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:14:11 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Hoepman",
"Jaap-Henk",
""
]
] | [
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802.0835 | Rossano Venturini | Paolo Ferragina, Igor Nitto and Rossano Venturini | Bit-Optimal Lempel-Ziv compression | null | null | null | null | cs.DS cs.IT math.IT | null | One of the most famous and investigated lossless data-compression scheme is
the one introduced by Lempel and Ziv about 40 years ago. This compression
scheme is known as "dictionary-based compression" and consists of squeezing an
input string by replacing some of its substrings with (shorter) codewords which
are actually pointers to a dictionary of phrases built as the string is
processed. Surprisingly enough, although many fundamental results are nowadays
known about upper bounds on the speed and effectiveness of this compression
process and references therein), ``we are not aware of any parsing scheme that
achieves optimality when the LZ77-dictionary is in use under any constraint on
the codewords other than being of equal length'' [N. Rajpoot and C. Sahinalp.
Handbook of Lossless Data Compression, chapter Dictionary-based data
compression. Academic Press, 2002. pag. 159]. Here optimality means to achieve
the minimum number of bits in compressing each individual input string, without
any assumption on its generating source. In this paper we provide the first
LZ-based compressor which computes the bit-optimal parsing of any input string
in efficient time and optimal space, for a general class of variable-length
codeword encodings which encompasses most of the ones typically used in data
compression and in the design of search engines and compressed indexes.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:31:54 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Ferragina",
"Paolo",
""
],
[
"Nitto",
"Igor",
""
],
[
"Venturini",
"Rossano",
""
]
] | [
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802.0836 | Andrew Berglund | Andrew J. Berglund, Siu Au Lee, Jabez J. McClelland | Sub-Doppler laser cooling and magnetic trapping of erbium | null | Phys. Rev. A 76, 053418 (2007) | 10.1103/PhysRevA.76.053418 | null | physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cooling mechanisms in magneto-optically and magnetically
trapped erbium. We find efficient sub-Doppler cooling in our trap, which can
persist even in large magnetic fields due to the near degeneracy of two Lande g
factors. Furthermore, a continuously loaded magnetic trap is demonstrated where
we observe temperatures below 25 microkelvin. These favorable cooling and
trapping properties suggest a number of scientific possibilities for rare-earth
atomic physics, including narrow linewidth laser cooling and spectroscopy,
unique collision studies, and degenerate bosonic and fermionic gases with
long-range magnetic dipole coupling.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:32:40 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Berglund",
"Andrew J.",
""
],
[
"Lee",
"Siu Au",
""
],
[
"McClelland",
"Jabez J.",
""
]
] | [
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] |
802.0837 | Sylvain Arlot | Sylvain Arlot (LM-Orsay, INRIA Futurs), Pascal Massart (LM-Orsay,
INRIA Futurs) | Data-driven calibration of penalties for least-squares regression | null | Journal of Machine Learning Research 10 (2009) 245-279 | null | null | math.ST stat.ME stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Penalization procedures often suffer from their dependence on multiplying
factors, whose optimal values are either unknown or hard to estimate from the
data. We propose a completely data-driven calibration algorithm for this
parameter in the least-squares regression framework, without assuming a
particular shape for the penalty. Our algorithm relies on the concept of
minimal penalty, recently introduced by Birge and Massart (2007) in the context
of penalized least squares for Gaussian homoscedastic regression. On the
positive side, the minimal penalty can be evaluated from the data themselves,
leading to a data-driven estimation of an optimal penalty which can be used in
practice; on the negative side, their approach heavily relies on the
homoscedastic Gaussian nature of their stochastic framework. The purpose of
this paper is twofold: stating a more general heuristics for designing a
data-driven penalty (the slope heuristics) and proving that it works for
penalized least-squares regression with a random design, even for
heteroscedastic non-Gaussian data. For technical reasons, some exact
mathematical results will be proved only for regressogram bin-width selection.
This is at least a first step towards further results, since the approach and
the method that we use are indeed general.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:42:13 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Mar 2008 07:29:39 GMT"
},
{
"version": "v3",
"created": "Fri, 19 Sep 2008 08:38:49 GMT"
},
{
"version": "v4",
"created": "Wed, 17 Dec 2008 09:21:55 GMT"
}
] | 2010-07-02T00:00:00 | [
[
"Arlot",
"Sylvain",
"",
"LM-Orsay, INRIA Futurs"
],
[
"Massart",
"Pascal",
"",
"LM-Orsay,\n INRIA Futurs"
]
] | [
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] |
802.0838 | Nils Paar Dr. | Dario Vretenar | Nuclear Energy Density Functionals Constrained by Low-Energy QCD | To be published in the Proceedings of the International Les Houches
School on "Exotic Nuclei: New Challenges", May 7-18 2007, Les Houches,
France, 32 pages, 10 figures | Eur.Phys.J.ST156:37-67,2008 | 10.1140/epjst/e2008-00608-0 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A microscopic framework of nuclear energy density functionals is reviewed,
which establishes a direct relation between low-energy QCD and nuclear
structure, synthesizing effective field theory methods and principles of
density functional theory. Guided by two closely related features of QCD in the
low-energy limit: a) in-medium changes of vacuum condensates, and b)
spontaneous breaking of chiral symmetry; a relativistic energy density
functional is developed and applied in studies of ground-state properties of
spherical and deformed nuclei.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:44:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vretenar",
"Dario",
""
]
] | [
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] |
802.0839 | Bernd Lorenz | R. P. Chaudhury, B. Lorenz, Y. Q. Wang, Y. Y. Sun, and C. W. Chu | The Suppression and Recovery of the Ferroelectric Phase in Multiferroic
$MnWO_4$ | null | Phys. Rev. B 77, 104406 (2008) | 10.1103/PhysRevB.77.104406 | null | cond-mat.str-el cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report the discovery of a complete suppression of ferroelectricity in
$MnWO_4$ by 10 % iron substitution and its restoration in external magnetic
fields. The spontaneous polarization in $Mn_{0.9}Fe_{0.1}WO_4$ arises below 12
K in external fields above 4 T. The magnetic/ferroelectric phase diagram is
constructed from the anomalies of the dielectric constant, polarization,
magnetization, and heat capacity. The observations are qualitatively described
by a mean field model with competing interactions and strong anisotropy. We
propose that the magnetic field induces a non-collinear inversion symmetry
breaking magnetic structure in $Mn_{0.9}Fe_{0.1}WO_4$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:51:13 GMT"
}
] | 2008-03-08T00:00:00 | [
[
"Chaudhury",
"R. P.",
""
],
[
"Lorenz",
"B.",
""
],
[
"Wang",
"Y. Q.",
""
],
[
"Sun",
"Y. Y.",
""
],
[
"Chu",
"C. W.",
""
]
] | [
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] |
802.084 | Michael Duff | L. Borsten, D. Dahanayake, M. J. Duff and W. Rubens, H. Ebrahim | Wrapped branes as qubits | Version appearing in Phys. Rev. Lett, includes Type IIA description
as well as Type IIB | Phys.Rev.Lett.100:251602,2008 | 10.1103/PhysRevLett.100.251602 | Imperial/TP/2008/mjd/1 | hep-th gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work has established a correspondence between the tripartite
entanglement measure of three qubits and the macroscopic entropy of the
four-dimensional 8-charge STU black hole of supergravity. Here we consider the
configurations of intersecting D3-branes, whose wrapping around the six compact
dimensions T^6 provides the microscopic string-theoretic interpretation of the
charges, and associate the three-qubit basis vectors |ABC>, (A,B,C=0 or 1) with
the corresponding 8 wrapping cycles. In particular, we relate a well-known fact
of quantum information theory, that the most general real three-qubit state can
be parameterized by four real numbers and an angle, to a well-known fact of
string theory, that the most general STU black hole can be described by four
D3-branes intersecting at an angle.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:52:08 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Jun 2008 09:24:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Borsten",
"L.",
""
],
[
"Dahanayake",
"D.",
""
],
[
"Duff",
"M. J.",
""
],
[
"Rubens",
"W.",
""
],
[
"Ebrahim",
"H.",
""
]
] | [
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] |
802.0841 | Juan Elias | Juan Elias and Giuseppe Valla | Isomorphism classes of certain Artinian Gorenstein algebras | 20 pages. This paper generalizes a previous version where the result
was proven for a power series ring in two variables | null | null | null | math.AC math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we classify, up to analytic isomorphism, the family of almost
stretched Artinian complete intersection A=R/I with a given Hilbert function,
in the case R is a power series ring with an arbitrary number of variables.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 16:54:18 GMT"
},
{
"version": "v2",
"created": "Thu, 9 Apr 2009 14:59:58 GMT"
},
{
"version": "v3",
"created": "Sun, 26 Apr 2009 16:40:43 GMT"
}
] | 2009-04-26T00:00:00 | [
[
"Elias",
"Juan",
""
],
[
"Valla",
"Giuseppe",
""
]
] | [
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] |
802.0842 | Pierre-Henri Chavanis | P.H. Chavanis | Two-dimensional Brownian vortices | null | Physica A, 387, 6917 (2008) | 10.1016/j.physa.2008.09.019 | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a stochastic model of two-dimensional Brownian vortices
associated with the canonical ensemble. The point vortices evolve through their
usual mutual advection but they experience in addition a random velocity and a
systematic drift generated by the system as a whole. The statistical
equilibrium state of this stochastic model is the Gibbs canonical distribution.
We consider a single species system and a system made of two types of vortices
with positive and negative circulations. At positive temperatures, like-sign
vortices repel each other (plasma case) and at negative temperatures, like-sign
vortices attract each other (gravity case). We derive the stochastic equation
satisfied by the exact vorticity field and the Fokker-Planck equation satisfied
by the N-body distribution function. We present the BBGKY-like hierarchy of
equations satisfied by the reduced distribution functions and close the
hierarchy by considering an expansion of the solutions in powers of 1/N, where
N is the number of vortices, in a proper thermodynamic limit. For spatially
inhomogeneous systems, we derive the kinetic equations satisfied by the smooth
vorticity field in a mean field approximation valid for $N\to +\infty$. For
spatially homogeneous systems, we study the two-body correlation function, in a
Debye-H\"uckel approximation valid at the order O(1/N). The results of this
paper can also apply to other systems of random walkers with long-range
interactions such as self-gravitating Brownian particles and bacterial
populations experiencing chemotaxis. Furthermore, for positive temperatures,
our study provides a kinetic derivation, from microscopic stochastic processes,
of the Debye-H\"uckel model of electrolytes.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:00:23 GMT"
},
{
"version": "v2",
"created": "Wed, 14 Jan 2009 10:58:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chavanis",
"P. H.",
""
]
] | [
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] |
802.0843 | Katharine Anderson | Katharine A. Anderson | Group formation with network constraints | null | null | null | null | physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Group formation is important in many economic contexts. The current
literature on group formation assumes that individuals may join any existing
group. In this paper, I consider the implications of social, geographic, and
informational constraints to group membership decisions. I embed the players in
a network of relationships, which constrains their choice of groups--they may
only join a group if that group contains a member that they are connected to on
the network. I then examine how this network constraint affects the equilibrium
group structure. I show that even with complete information, unconstrained
individuals form groups that are inefficiently large. When individuals are
constrained, the resulting group structures are much closer to the socially
optimal group structure, because the constraint limits the ability of the
individual to free ride on the efforts of other group members. The efficiency
of the outcome is related to the structure of the network constraint--outcomes
are more efficient when networks are sparse and have few random connections.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:08:43 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jul 2016 14:01:00 GMT"
}
] | 2016-07-27T00:00:00 | [
[
"Anderson",
"Katharine A.",
""
]
] | [
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802.0844 | Dvira Segal | Dvira Segal | Single mode heat rectifier: Controlling energy flow between electronic
conductors | null | PRL 100, 105901 (2008) | 10.1103/PhysRevLett.100.105901 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study heat transfer between conductors, mediated by the excitation of a
monomodal harmonic oscillator. Using a simple model, we show that the onset of
rectification in the system is directly related to the nonlinearity of the
electron gas dispersion relation. When the metals have strictly linear
dispersion relation a Landauer type expression for the thermal current holds,
symmetric with respect to the temperature difference. Rectification becomes
prominent when deviations from linear dispersion exist, and the fermionic model
cannot be mapped into a harmonic- bosonized- representation. The effects
described here are relevant for understanding radiative heat transfer and
vibrational energy flow in electrically insulating molecular junctions.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:11:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Segal",
"Dvira",
""
]
] | [
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] |
802.0845 | David Charbonneau | David Charbonneau, Heather A. Knutson, Travis Barman, Lori E. Allen,
Michel Mayor, S. Thomas Megeath, Didier Queloz, and Stephane Udry | The Broadband Infrared Emission Spectrum of the Exoplanet HD 189733b | 20 pages, 3 figures, accepted to the Astrophysical Journal, minor
revisions | null | 10.1086/591635 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present Spitzer Space Telescope time series photometry of the exoplanet
system HD 189733 spanning two times of secondary eclipse, when the planet
passes out of view behind the parent star. We estimate the relative eclipse
depth in 5 distinct bands and find the planet-to-star flux ratio to be 0.256
+/- 0.014% (3.6 microns), 0.214 +/- 0.020% (4.5 microns), 0.310 +/- 0.034% (5.8
microns), 0.391 +/- 0.022% (8.0 microns), and 0.598 +/- 0.038% (24 microns).
For consistency, we re-analyze a previously published time series to deduce a
contrast ratio in an additional band, 0.519 +/- 0.020% (16 microns). Our data
are strongly inconsistent with a Planck spectrum, and we clearly detect
emission near 4 microns as predicted by published theoretical models in which
this feature arises from a corresponding opacity window. Unlike recent results
for the exoplanet HD 209458b, we find that the emergent spectrum from HD
189733b is best matched by models that do not include an atmospheric
temperature inversion. Taken together, these two studies provide initial
observational support for the idea that hot Jupiter atmospheres diverge into
two classes, in which a thermal inversion layer is present for the more
strongly irradiated objects.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:19:04 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jul 2008 13:17:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Charbonneau",
"David",
""
],
[
"Knutson",
"Heather A.",
""
],
[
"Barman",
"Travis",
""
],
[
"Allen",
"Lori E.",
""
],
[
"Mayor",
"Michel",
""
],
[
"Megeath",
"S. Thomas",
""
],
[
"Queloz",
"Didier",
""
],
[
"Udry",
"Stephane",
""
]
] | [
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] |
802.0846 | Paolo Antonelli | Paolo Antonelli and Pierangelo Marcati | On the Finite Energy Weak Solutions to a System in Quantum Fluid
Dynamics | null | null | 10.1007/s00220-008-0632-0 | null | math.AP math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider the global existence of weak solutions to a class
of Quantum Hydrodynamics (QHD) systems with initial data, arbitrarily large in
the energy norm. These type of models, initially proposed by Madelung, have
been extensively used in Physics to investigate Supefluidity and
Superconductivity phenomena and more recently in the modeling of semiconductor
devices . Our approach is based on various tools, namely the wave functions
polar decomposition, the construction of approximate solution via a fractional
steps method, which iterates a Schr\"odinger Madelung picture with a suitable
wave function updating mechanism. Therefore several \emph{a priori} bounds of
energy, dispersive and local smoothing type allow us to prove the compactness
of the approximating sequences. No uniqueness result is provided.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:19:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Antonelli",
"Paolo",
""
],
[
"Marcati",
"Pierangelo",
""
]
] | [
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] |
802.0847 | Neda Zoltan | M. Ercsey-Ravasz, Zs. Sarkozi, Z. Neda, A. Tunyagi, and I. Burda | Collective behavior of "electronic fireflies" | 4 pages, 4 figures included | null | 10.1140/epjb/e2008-00336-1 | null | nlin.AO | http://creativecommons.org/licenses/by/3.0/ | A simple system composed of electronic oscillators capable of emitting and
detecting light-pulses is studied. The oscillators are biologically inspired,
their behavior is designed for keeping a desired light intensity, W, in the
system. From another perspective, the system behaves like modified integrate
and fire type neurons that are pulse-coupled with inhibitory type interactions:
the firing of one oscillator delays the firing of all the others. Experimental
and computational studies reveal that although no driving force favoring
synchronization is considered, for a given interval of W phase-locking appears.
This weak synchronization is sometimes accompanied by complex dynamical
patterns in the flashing sequence of the oscillators.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:20:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ercsey-Ravasz",
"M.",
""
],
[
"Sarkozi",
"Zs.",
""
],
[
"Neda",
"Z.",
""
],
[
"Tunyagi",
"A.",
""
],
[
"Burda",
"I.",
""
]
] | [
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] |
802.0848 | Jean-Pierre De Villiers | Jean-Pierre De Villiers | Some First Steps Towards a Radiation GRMHD Code: Radiative Effects on
Accretion Rate onto a Kerr Black Hole | 23 pages, six colour figures | null | null | null | astro-ph | null | The role of radiation in general relativistic magnetohydrodynamic (GRMHD)
accretion simulations is discussed through axisymmetric simulations of the
evolution of an initial torus seeded with a weak magnetic field. The paper
compares and contrasts the rate of accretion onto a Kerr black hole and mass
flux out out of the initial torus at large radii in the GRMHD code of De
Villiers and Hawley and a newly developed radiative GRMHD code. This rGRMHD
code currently operates in the diffusion approximation, restricting the study
of radiative effects to the bound portion of the accretion disk/jet system.
However, these preliminary findings suggest that radiative effects do play a
potentially significant role in regulating the accretion flow.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:33:59 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"De Villiers",
"Jean-Pierre",
""
]
] | [
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802.0849 | Natalia Vale Asari | R. Cid Fernandes (1), W. Schoenell (1), J. M. Gomes (1), N V. Asari
(1), M. Schlickmann (1), A. Mateus (2), G. Stasinska (3), L. Sodre (4), J. P.
Torres-Papaqui (5) (for the SEAGal collaboration) ((1) UFSC, Brazil, (2)
Laboratoire d'Astrophysique de Marseille, France, (3) LUTH, Observatoire de
Paris, France, (4) USP, Brazil, (5) INAOE, Mexico) | The Star Formation Histories of galaxies: A tour through the
STARLIGHT-SDSS database | To appear in "Memorias de la Reunion Regional Latino Americana de la
UAI (2007)" | null | null | null | astro-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Retrieving the Star Formation History (SFH) of a galaxy out of its integrated
spectrum is the central goal of stellar population synthesis. Recent advances
in evolutionary synthesis models have given new breath to this old field of
research. Modern spectral synthesis techniques incorporating these advances now
allow the fitting of galaxy spectra on an angstrom-by-angstrom basis. These
detailed fits are useful for a number of studies, like emission line, stellar
kinematics, and specially galaxy evolution. Applications of this semi-empirical
approach to mega data sets are teaching us a lot about the lives of galaxies.
The STARLIGHT spectral synthesis code is one of the tools which allows one to
harness this favorable combination of plentifulness of data and models. To
illustrate this, we show how SFHs vary across classical emission line
diagnostic diagrams. Systematic trends are present along both the star-forming
and active-galaxy sequences. We also briefly describe experiments with new
versions of evolutionary synthesis models. Last but not least, we announce the
public availability of both STARLIGHT and a database of detailed spectral fits
and related products for over half a million galaxies from the SDSS. This
facility allows more physically inspired explorations of the parameter space
than is possible in terms of raw observed properties, offering new ways to
navigate through the realm of galaxies.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:26:38 GMT"
}
] | 2019-08-15T00:00:00 | [
[
"Fernandes",
"R. Cid",
""
],
[
"Schoenell",
"W.",
""
],
[
"Gomes",
"J. M.",
""
],
[
"Asari",
"N V.",
""
],
[
"Schlickmann",
"M.",
""
],
[
"Mateus",
"A.",
""
],
[
"Stasinska",
"G.",
""
],
[
"Sodre",
"L.",
""
],
[
"Torres-Papaqui",
"J. P.",
""
]
] | [
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] |
802.085 | Andrew Lorent | Robert L. Jerrard and Andrew Lorent | On multiwell Liouville theorems in higher dimension | 35 pages | null | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider certain subsets of the space of $n\times n$ matrices of the form
$K = \cup_{i=1}^m SO(n)A_i$, and we prove that for $p>1, q \geq 1$ and for
connected $\Omega'\subset\subset\Omega\subset \R^n$, there exists positive
constant $a<1$ depending on $n,p,q, \Omega, \Omega'$ such that for $ \veps=\|
{dist}(Du, K)\|_{L^p(\Omega)}^p$ we have $\inf_{R\in
K}\|Du-R\|^p_{L^p(\Omega')}\leq M\veps^{1/p}$ provided $u$ satisfies the
inequality $\| D^2 u\|_{L^q(\Omega)}^q\leq a\veps^{1-q}$. Our main result holds
whenever $m=2$, and also for {\em generic} $m\le n$ in every dimension $n\ge
3$, as long as the wells $SO(n)A_1,..., SO(n)A_m$ satisfy a certain
connectivity condition. These conclusions are mostly known when $n=2$, and they
are new for $n\ge 3$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:37:07 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Jerrard",
"Robert L.",
""
],
[
"Lorent",
"Andrew",
""
]
] | [
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] |
802.0851 | Juan Carlos Pardo Millan | M.E. Caballero, J.C. Pardo and J.L. P\'erez | On the Lamperti stable processes | 6 figures | null | null | null | math.PR | null | We consider a new family of $\R^d$-valued L\'{e}vy processes that we call
Lamperti stable. One of the advantages of this class is that the law of many
related functionals can be computed explicitely (see for instance \cite{cc},
\cite{ckp}, \cite{kp} and \cite{pp}). This family of processes shares many
properties with the tempered stable and the layered stable processes, defined
in Rosi\'nski \cite{ro} and Houdr\'e and Kawai \cite{hok} respectively, for
instance their short and long time behaviour. Additionally, in the real valued
case we find a series representation which is used for sample paths simulation.
In this work we find general properties of this class and we also provide many
examples, some of which appear in recent literature.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:39:10 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 21:15:55 GMT"
},
{
"version": "v3",
"created": "Thu, 6 Mar 2008 14:56:43 GMT"
}
] | 2008-03-06T00:00:00 | [
[
"Caballero",
"M. E.",
""
],
[
"Pardo",
"J. C.",
""
],
[
"Pérez",
"J. L.",
""
]
] | [
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] |
802.0852 | Stephen Sangwine | Stephen J. Sangwine, Nicolas Le Bihan | Quaternion polar representation with a complex modulus and complex
argument inspired by the Cayley-Dickson form | Version 2 has some additional text in Theorem 1 to cover degenerate
cases such as q=k, where alpha=0. There is also an extra numerical example in
section 3 to illustrate this | Advances in Applied Clifford Algebras, 20, (1), March 2010,
111-120 | 10.1007/s00006-008-0128-1 | null | math.RA | null | We present a new polar representation of quaternions inspired by the
Cayley-Dickson representation. In this new polar representation, a quaternion
is represented by a pair of complex numbers as in the Cayley-Dickson form, but
here these two complex numbers are a complex 'modulus' and a complex
'argument'. As in the Cayley-Dickson form, the two complex numbers are in the
same complex plane (using the same complex root of -1), but the complex phase
is multiplied by a different complex root of -1 in the exponential function. We
show how to calculate the amplitude and phase from an arbitrary quaternion in
Cartesian form.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 17:57:32 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 17:16:59 GMT"
}
] | 2010-03-16T00:00:00 | [
[
"Sangwine",
"Stephen J.",
""
],
[
"Bihan",
"Nicolas Le",
""
]
] | [
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] |
802.0853 | E. Izadi | E. Izadi, M. Lo Giudice and G.K. Sankaran | The moduli space of \'etale double covers of genus 5 curves is
unirational | 14 pages | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the coarse moduli space $\cR_5$ of \'etale double covers of
curves of genus~5 over the complex numbers is unirational. We give two slightly
different arguments, one purely geometric and the other more computational.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:11:30 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Izadi",
"E.",
""
],
[
"Giudice",
"M. Lo",
""
],
[
"Sankaran",
"G. K.",
""
]
] | [
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] |
802.0854 | Travis S. Barman | Travis S. Barman | On the Presence of Water and Global Circulation in the Transiting Planet
HD 189733b | accepted (2008 Feb. 5), ApJ Letters | null | 10.1086/587056 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detailed models are compared to recent infrared observations of the nearby
extrasolar planet, HD 189733b. It is demonstrated that atmospheric water is
present and that the planet's day side has a non-isothermal structure down to
gas pressures of ~ 0.1 bars. Furthermore, model spectra with different amounts
of CO are compared to the observations and an atmosphere absent of CO is
excluded at roughly 2-sigma. Constraining the CO concentration beyond that is
unfortunately not possible with the current Spitzer photometry. However,
radically enhanced (or depleted) metal abundances are unlikely and the basic
composition of this planet is probably similar to that of its host star. When
combined with Spitzer observations, a recent ground-based upper limit for the
K-band day side flux allows one to estimate the day-to-night energy
redistribution efficiency to be ~ 43%.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:18:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barman",
"Travis S.",
""
]
] | [
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802.0855 | Aleksandrs Belovs | Aleksandrs Belovs and Juris Smotrovs | A Criterion for Attaining the Welch Bounds with Applications for
Mutually Unbiased Bases | 19 pages: revised and heavily extended in the part concerning MUBs | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper gives a short introduction to mutually unbiased bases and the Welch
bounds and demonstrates that the latter is a good technical tool to explore the
former. In particular, a criterion for a system of vectors to satisfy the Welch
bounds with equality is given and applied for the case of MUBs. This yields a
necessary and sufficient condition on a set of orthonormal bases to form a
complete system of MUBs.
This condition takes an especially elegant form in the case of homogeneous
systems of MUBs. We express some known constructions of MUBs in this form. Also
it is shown how recently obtained results binding MUBs and some combinatorial
structures (such as perfect nonlinear functions and relative difference sets)
naturally follow from this criterion.
Some directions for proving non-existence results are sketched as well.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:20:35 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jul 2008 19:53:21 GMT"
}
] | 2008-07-22T00:00:00 | [
[
"Belovs",
"Aleksandrs",
""
],
[
"Smotrovs",
"Juris",
""
]
] | [
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] |
802.0856 | Jesse Johnson | Jesse Johnson | Horizontal Heegaard splittings of Seifert fibered spaces | 15 pages, 1 figure | null | null | null | math.GT | null | We show that if an orientable Seifert fibered space $M$ with an orientable
genus $g$ base space admits a strongly irreducible horizontal Heegaard
splitting then there is a one-to-one correspondence between isotopy classes of
strongly irreducible horizontal Heegaard splittings and elements of
$\mathbf{Z}^{2g}$. The correspondence is determined by the slopes of
intersection of each Heegaard splitting with a collection of $2g$
incompressible tori in $M$. We also show that there are Seifert fibered spaces
with infinitely many non-isotopic Heegaard splittings that determine Nielsen
equivalent generating systems for the fundamental group of $M$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:30:39 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Johnson",
"Jesse",
""
]
] | [
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] |
802.0857 | Andrew Berglund | Andrew J. Berglund, James L. Hanssen, Jabez J. McClelland | Narrow-line magneto-optical cooling and trapping of strongly magnetic
atoms | To appear in Phys. Rev. Lett. 4 pages, 5 figures | null | 10.1103/PhysRevLett.100.113002 | null | physics.atom-ph quant-ph | null | Laser cooling on weak transitions is a useful technique for reaching
ultracold temperatures in atoms with multiple valence electrons. However, for
strongly magnetic atoms a conventional narrow-line magneto-optical trap (MOT)
is destabilized by competition between optical and magnetic forces. We overcome
this difficulty in Er by developing an unusual narrow-line MOT that balances
optical and magnetic forces using laser light tuned to the blue side of a
narrow (8 kHz) transition. The trap population is spin-polarized with
temperatures reaching below 2 microkelvin. Our results constitute an
alternative method for laser cooling on weak transitions, applicable to
rare-earth-metal and metastable alkaline earth elements.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:58:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Berglund",
"Andrew J.",
""
],
[
"Hanssen",
"James L.",
""
],
[
"McClelland",
"Jabez J.",
""
]
] | [
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] |
802.0858 | David Holcman | David Holcman (1) and Ivan Kupka (2) (1) (Weizmann Institute of
Science, department of Mathematics, Rehovot, Israel.) (2) (Department of
Mathematics, University of Toronto, Ontario, Canada) | Semi-classical limits of the first eigenfunction and concentration on
the recurrent sets of a dynamical system | around 70 pages. Can't be read in one shot | null | null | null | math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Dear Reader, please find the third and last part of a series of papers on the
singular perturbation of the first eigenfunction associated to a non
self-adjoint second order elliptic operators. This series started in 1999 and
we presented the early results in 2000 at Columbia University. We published two
notes in CRAS in 2001 and 2005 summarizing our results. The present paper
contains the proofs of the announced theorems and many open questions. We tried
to publish these results in the the top tier of mathematical journals (Annals,
Acta, Duke...) but our results were not deemed sufficiently interesting for
them and probably not trendy enough. Some of you may like this work, so here it
is. Best Regards, Ivan and David.
We study the semi-classical limits of the first eigenfunction of a positive
second order operator on a compact Riemannian manifold, when the diffusion
constant $\epsilon$ goes to zero. If the drift of the diffusion is given by a
Morse-Smale vector field $b$, the limits of the eigenfunctions concentrate on
the recurrent set of $b$. A blow-up analysis enables us to find the main
properties of the limit measures on a recurrent set.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:28:43 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Holcman",
"David",
""
],
[
"Kupka",
"Ivan",
""
]
] | [
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] |
802.0859 | Nikolaos Brouzakis | N. Brouzakis, N. Tetradis | Analytical Estimate of the Effect of Spherical Inhomogeneities on
Luminosity Distance and Redshift | 11 pages, references added, discussion expanded | Phys.Lett.B665:344-348,2008 | 10.1016/j.physletb.2008.06.032 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide an analytical estimate of the effect of a spherical inhomogeneity
on light beams that travel through it. We model the interior of the
inhomogeneity in terms of the Lemaitre-Tolman-Bondi metric. We assume that the
beam source is located outside the inhomogeneity. We study the relative
deviations of travelling time, redshift, beam area and luminosity distance from
their values in a homogeneous cosmology. They depend on the ratio Hb=H r_0 of
the radius r_0 of the inhomogeneity to the horizon distance 1/H. For an
observer located at the center, the deviations are of order Hb^2. For an
observer outside the inhomogeneity, the deviations of crossing time and
redshift are of order Hb^3. The deviations of beam area and luminosity distance
are of order Hb^2. However, when averaged over all possible locations of the
observer outside the inhomogeneity, they also become of order Hb^3. We discuss
the implications for the possibility of attributing the observed cosmological
acceleration to the emergence of large-scale structure.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:22:54 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jun 2008 14:42:41 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Brouzakis",
"N.",
""
],
[
"Tetradis",
"N.",
""
]
] | [
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] |
802.086 | Reyco Henning | Yuen-Dat Chan, Jason A. Detwiler, Reyco Henning, Victor M. Gehman, Rob
A. Johnson, David V. Jordan, Kareem Kazkaz, Markus Knapp, Kevin Kroninger,
Daniel Lenz, Jing Liu, Xiang Liu, Michael G. Marino, Akbar Mokhtarani,
Luciano Pandola, Alexis G. Schubert, Claudia Tomei | MaGe - a Geant4-based Monte Carlo framework for low-background
experiments | null | null | null | null | nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Monte Carlo framework, MaGe, has been developed based on the Geant4
simulation toolkit. Its purpose is to simulate physics processes in low-energy
and low-background radiation detectors, specifically for the Majorana and Gerda
$^{76}$Ge neutrinoless double-beta decay experiments. This jointly-developed
tool is also used to verify the simulation of physics processes relevant to
other low-background experiments in Geant4. The MaGe framework contains
simulations of prototype experiments and test stands, and is easily extended to
incorporate new geometries and configurations while still using the same
verified physics processes, tunings, and code framework. This reduces
duplication of efforts and improves the robustness of and confidence in the
simulation output.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:36:24 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Chan",
"Yuen-Dat",
""
],
[
"Detwiler",
"Jason A.",
""
],
[
"Henning",
"Reyco",
""
],
[
"Gehman",
"Victor M.",
""
],
[
"Johnson",
"Rob A.",
""
],
[
"Jordan",
"David V.",
""
],
[
"Kazkaz",
"Kareem",
""
],
[
"Knapp",
"Markus",
""
],
[
"Kroninger",
"Kevin",
""
],
[
"Lenz",
"Daniel",
""
],
[
"Liu",
"Jing",
""
],
[
"Liu",
"Xiang",
""
],
[
"Marino",
"Michael G.",
""
],
[
"Mokhtarani",
"Akbar",
""
],
[
"Pandola",
"Luciano",
""
],
[
"Schubert",
"Alexis G.",
""
],
[
"Tomei",
"Claudia",
""
]
] | [
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] |
802.0861 | Paul Gazis | Paul R. Gazis and Jeffrey D. Scargle | Using Bayesian Blocks to Partition Self-Organizing Maps | 9 pages, 3 figures | null | null | null | cs.NE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self organizing maps (SOMs) are widely-used for unsupervised classification.
For this application, they must be combined with some partitioning scheme that
can identify boundaries between distinct regions in the maps they produce. We
discuss a novel partitioning scheme for SOMs based on the Bayesian Blocks
segmentation algorithm of Scargle [1998]. This algorithm minimizes a cost
function to identify contiguous regions over which the values of the attributes
can be represented as approximately constant. Because this cost function is
well-defined and largely independent of assumptions regarding the number and
structure of clusters in the original sample space, this partitioning scheme
offers significant advantages over many conventional methods. Sample code is
available.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:50:16 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Gazis",
"Paul R.",
""
],
[
"Scargle",
"Jeffrey D.",
""
]
] | [
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] |
802.0862 | Filippo Palombi | A.Grimbach, D.Guazzini, F.Knechtli, F.Palombi | O(a) improvement of the HYP static axial and vector currents at one-loop
order of perturbation theory | 24 pages, 7 figures | JHEP0803:039,2008 | 10.1088/1126-6708/2008/03/039 | CERN-PH-TH/2008-010, SFB/CPP-08-09, WUB/08-01 | hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate analytically the improvement coefficients of the static axial
and vector currents in O(a) improved lattice QCD at one-loop order of
perturbation theory. The static quark is described by the hypercubic action,
previously introduced in the literature in order to improve the signal-to-noise
ratio of static observables. Within a Schroedinger Functional setup, we derive
the Feynman rules of the hypercubic link in time-momentum representation. The
improvement coefficients are obtained from on-shell correlators of the static
axial and vector currents. As a by-product, we localise the minimum of the
static self-energy as a function of the smearing parameters of the action at
one-loop order and show that the perturbative minimum is close to its
non-perturbative counterpart.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 18:55:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grimbach",
"A.",
""
],
[
"Guazzini",
"D.",
""
],
[
"Knechtli",
"F.",
""
],
[
"Palombi",
"F.",
""
]
] | [
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802.0863 | Huey-Wen Lin | Huey-Wen Lin, Tom Blum, Shigemi Ohta, Shoichi Sasaki, Takeshi Yamazaki | Nucleon structure with two flavors of dynamical domain-wall fermions | 28 pages in two columns; 37 figures, 12 tables | Phys.Rev.D78:014505,2008 | 10.1103/PhysRevD.78.014505 | null | hep-lat | http://creativecommons.org/licenses/publicdomain/ | We present a numerical lattice quantum chromodynamics calculation of
isovector form factors and the first few moments of the isovector structure
functions of the nucleon. The calculation employs two degenerate dynamical
flavors of domain-wall fermions, resulting in good control of chiral symmetry
breaking. Non-perturbative renormalization of the relevant quark currents is
performed where necessary. The inverse lattice spacing, $a^{-1}$, is about 1.7
GeV. We use degenerate up and down dynamical quark masses around 1, 3/4 and 1/2
the strange quark mass. The physical volume of the lattice is about
$(1.9{fm})^3$. The ratio of the isovector vector to axial charges, $g_A/g_V$,
trends a bit lower than the experimental value as the quark mass is reduced
toward the physical point. We calculate the momentum-transfer dependences of
the isovector vector, axial, induced tensor and induced pseudoscalar form
factors. The Goldberger-Treiman relation holds at low momentum transfer and
yields a pion-nucleon coupling, $g_{\pi NN} = 15.5(1.4)$, where the quoted
error is only statistical. We find that the flavor non-singlet quark momentum
fraction $<x>_{u-d}$ and quark helicity fraction $<x>_{\Delta u-\Delta d}$
overshoot their experimental values after linear chiral extrapolation. We
obtain the transversity, $<1 >_{\delta u-\delta d} = 0.93(6)$ in $\bar{\rm MS}$
at 2 GeV and a twist-3 polarized moment, $d_1$, appears small, suggesting that
the Wandzura-Wilczek relation holds approximately. We discuss the systematic
errors in the calculation, with particular attention paid to finite-volume
effects, excited-state contamination, and chiral extrapolations.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:05:34 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Lin",
"Huey-Wen",
""
],
[
"Blum",
"Tom",
""
],
[
"Ohta",
"Shigemi",
""
],
[
"Sasaki",
"Shoichi",
""
],
[
"Yamazaki",
"Takeshi",
""
]
] | [
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802.0864 | Simone Speziale | Bianca Dittrich and Simone Speziale | Area-angle variables for general relativity | 7 pages, 1 figure. v2 small changes to match published version | NewJ.Phys.10:083006,2008 | 10.1088/1367-2630/10/8/083006 | pi-qg-72 | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a modified Regge calculus for general relativity on a
triangulated four dimensional Riemannian manifold where the fundamental
variables are areas and a certain class of angles. These variables satisfy
constraints which are local in the triangulation. We expect the formulation to
have applications to classical discrete gravity and non-perturbative approaches
to quantum gravity.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:12:57 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jul 2008 16:24:49 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Jul 2008 23:50:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dittrich",
"Bianca",
""
],
[
"Speziale",
"Simone",
""
]
] | [
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] |
802.0865 | Andrew Gacek | Andrew Gacek, Dale Miller, and Gopalan Nadathur | Combining generic judgments with recursive definitions | To appear in LICS 2008 | null | null | null | cs.LO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many semantical aspects of programming languages, such as their operational
semantics and their type assignment calculi, are specified by describing
appropriate proof systems. Recent research has identified two proof-theoretic
features that allow direct, logic-based reasoning about such descriptions: the
treatment of atomic judgments as fixed points (recursive definitions) and an
encoding of binding constructs via generic judgments. However, the logics
encompassing these two features have thus far treated them orthogonally: that
is, they do not provide the ability to define object-logic properties that
themselves depend on an intrinsic treatment of binding. We propose a new and
simple integration of these features within an intuitionistic logic enhanced
with induction over natural numbers and we show that the resulting logic is
consistent. The pivotal benefit of the integration is that it allows recursive
definitions to not just encode simple, traditional forms of atomic judgments
but also to capture generic properties pertaining to such judgments. The
usefulness of this logic is illustrated by showing how it can provide elegant
treatments of object-logic contexts that appear in proofs involving typing
calculi and of arbitrarily cascading substitutions that play a role in
reducibility arguments.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:18:57 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Apr 2008 13:25:42 GMT"
}
] | 2008-04-14T00:00:00 | [
[
"Gacek",
"Andrew",
""
],
[
"Miller",
"Dale",
""
],
[
"Nadathur",
"Gopalan",
""
]
] | [
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] |
802.0866 | Galina L. Klimchitskaya | V.M. Mostepanenko, R.S. Decca, E. Fischbach, G.L. Klimchitskaya, D.E.
Krause and D. L\'opez | Stronger constraints on non-Newtonian gravity from the Casimir effect | 9 pages, 2 figures, Proceedings of QFEXT07, to appear in J. Phys. A | J.Phys.A41:164054,2008 | 10.1088/1751-8113/41/16/164054 | null | hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review new constraints on the Yukawa-type corrections to Newtonian gravity
obtained recently from gravitational experiments and from the measurements of
the Casimir force. Special attention is paid to the constraints following from
the most precise dynamic determination of the Casimir pressure between the two
parallel plates by means of a micromechanical torsional oscillator. The
possibility of setting limits on the predictions of chameleon field theories
using the results of gravitational experiments and Casimir force measurements
is discussed.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:26:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mostepanenko",
"V. M.",
""
],
[
"Decca",
"R. S.",
""
],
[
"Fischbach",
"E.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Krause",
"D. E.",
""
],
[
"López",
"D.",
""
]
] | [
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] |
802.0867 | Nicolas Rougemaille | Fabien Cheynis (NEEL), Nicolas Rougemaille (NEEL), Rachid Belkhou
(SSOLEIL), Jean-Christophe Toussaint (NEEL), Olivier Fruchart (NEEL) | X-ray photoelectron emission microscopy in combination with x-ray
magnetic circular dichroism investigation of size effects on field-induced
N\'eel-cap reversal | null | Journal of Applied Physics 103 (2008) 07D915 | 10.1063/1.2832332 | null | cond-mat.mtrl-sci | null | X-ray photoelectron emission microscopy in combination with x-ray magnetic
circular dichroism is used to investigate the influence of an applied magnetic
field on N\'eel caps (i.e., surface terminations of asymmetric Bloch walls).
Self-assembled micron-sized Fe(110) dots displaying a moderate distribution of
size and aspect ratios serve as model objects. Investigations of remanent
states after application of an applied field along the direction of N\'eel-cap
magnetization give clear evidence for the magnetization reversal of the N\'eel
caps around 120 mT, with a $\pm$20 mT dispersion. No clear correlation could be
found between the value of the reversal field and geometrical features of the
dots.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 19:50:19 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Cheynis",
"Fabien",
"",
"NEEL"
],
[
"Rougemaille",
"Nicolas",
"",
"NEEL"
],
[
"Belkhou",
"Rachid",
"",
"SSOLEIL"
],
[
"Toussaint",
"Jean-Christophe",
"",
"NEEL"
],
[
"Fruchart",
"Olivier",
"",
"NEEL"
]
] | [
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802.0868 | Pierre Vanhove | N. E. J. Bjerrum-Bohr and Pierre Vanhove | Explicit Cancellation of Triangles in One-loop Gravity Amplitudes | 25 pages. 2 eps pictures, harvmac format. v2: version to appear in
JHEP. Equations (3.9), (3.12) and minor typos corrected | JHEP0804:065,2008 | 10.1088/1126-6708/2008/04/065 | null | hep-th | null | We analyse one-loop graviton amplitudes in the field theory limit of a
genus-one string theory computation. The considered amplitudes can be
dimensionally reduced to lower dimensions preserving maximal supersymmetry. The
particular case of the one-loop five-graviton amplitude is worked out in detail
and explicitly features no triangle contributions. Based on a recursive form of
the one-loop amplitude we investigate the contributions that will occur at
n-point order in relation to the ``no-triangle'' hypothesis of N=8
supergravity. We argue that the origin of unexpected cancellations observed in
gravity scattering amplitudes is linked to general coordinate invariance of the
gravitational action and the summation over all orderings of external legs.
Such cancellations are instrumental in the extraordinary good ultra-violet
behaviour of N=8 supergravity amplitudes and will play a central role in
improving the high-energy behaviour of gravity amplitudes at more than one
loop.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 20:46:31 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Apr 2008 17:05:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bjerrum-Bohr",
"N. E. J.",
""
],
[
"Vanhove",
"Pierre",
""
]
] | [
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802.0869 | S. A. Belbas | S. A. Belbas, W. H. Schmidt | Optimal control of impulsive Volterra equations with variable impulse
times | 23 pages | null | null | null | math.OC math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain necessary conditions of optimality for impulsive Volterra integral
equations with switching and impulsive controls, with variable impulse
time-instants. The present work continues and complements our previous work on
impulsive Volterra control with fixed impulse times.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 20:31:14 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Belbas",
"S. A.",
""
],
[
"Schmidt",
"W. H.",
""
]
] | [
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802.087 | Iman Marvian | I. Marvian and R.B. Mann | Building all Time Evolutions with Rotationally Invariant Hamiltonians | 26 pages, 5 figures; V2 published version (Typos corrected, Figures
changed, more discussion about metric) | Phys. Rev. A 78, 022304 (2008) | 10.1103/PhysRevA.78.022304 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All elementary Hamiltonians in nature are expected to be invariant under
rotation. Despite this restriction, we usually assume that any arbitrary
measurement or unitary time evolution can be implemented on a physical system,
an assumption whose validity is not obvious. We introduce two different schemes
by which any arbitrary unitary time evolution and measurement can be
implemented with desired accuracy by using rotationally invariant Hamiltonians
that act on the given system and two ancillary systems serving as reference
frames. These frames specify the z and x directions and are independent of the
desired time evolution. We also investigate the effects of quantum fluctuations
that inevitably arise due to usage of a finite system as a reference frame and
estimate how fast these fluctuations tend to zero when the size of the
reference frame tends to infinity. Moreover we prove that for a general
symmetry any symmetric quantum operations can be implemented just by using
symmetric interactions and ancillas in the symmetric states.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 00:16:57 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Aug 2008 00:34:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marvian",
"I.",
""
],
[
"Mann",
"R. B.",
""
]
] | [
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] |
802.0871 | Gabriele Ghisellini | F. Tavecchio and G. Ghisellini (INAF - Osservatorio Astronomico di
Brera, Italy) | The spectrum of the Broad Line Region and the high-energy emission of
powerful blazars | 10 pages, 9 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13072.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-energy emission (from the X-ray through the gamma-ray band) of Flat
Spectrum Radio Quasars is widely associated with the inverse Compton (IC)
scattering of ambient photons, produced either by the accretion disk or by the
Broad Line Region, by high-energy electrons in a relativistic jet. In the
modelling of the IC spectrum one usually adopts a simple black-body
approximation for the external radiation field, though the real shape is
probably more complex. The knowledge of the detailed spectrum of the external
radiation field would allow to better characterize the soft-medium X-ray IC
spectrum, which is crucial to address several issues related to the study of
these sources. Here we present a first step in this direction, calculating the
IC spectra expected by considering a realistic spectrum for the external
radiation energy density produced by the BLR, as calculated with the
photoionization code CLOUDY. We find that, under a wide range of the physical
parameters characterizing the BLR clouds, the IC spectrum calculated with the
black-body approximation reproduces quite well the exact spectrum for energies
above few keV. In the soft energy band, instead, the IC emission calculated
using the BLR emission shows a complex shape, with a moderate excess with
respect to the approximate spectrum, which becomes more important for
decreasing values of the peak frequency of the photoionizing continuum. We also
show that the high-energy spectrum shows a marked steepening, due to the energy
dependence of the scattering cross section, above a characteristic energy of
10-20 GeV, quasi independent on the Lorentz factor of the jet.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 21:00:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tavecchio",
"F.",
"",
"INAF - Osservatorio Astronomico di\n Brera, Italy"
],
[
"Ghisellini",
"G.",
"",
"INAF - Osservatorio Astronomico di\n Brera, Italy"
]
] | [
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] |
802.0872 | Joshua Younger | Joshua D. Younger (1), Gurtina Besla (1), T. J. Cox (1), Lars
Hernquist (1), Brant Robertson (2,3), and Beth Willman (1) ((1) Harvard/CfA;
(2) University of Chicago; (3) Enrico Fermi Institute) | On the Origin of Dynamically Cold Rings Around the Milky Way | accepted to ApJL; 4 Figures | null | 10.1086/587099 | null | astro-ph | null | We present a scenario for the production of dynamically cold rings around the
Milky Way via a high-eccentricity, flyby encounter. These initial conditions
are more cosmologically motivated than those considered in previous works. We
find that the encounters we examine generically produce a series of nearly
dynamically cold ring-like features on low-eccentricity orbits that persist
over timescales of ~2-4 Gyr via the tidal response of the primary galaxy to the
close passage of the satellite. Moreover, they are both qualitatively and
quantitatively similar to the distribution, kinematics, and stellar population
of the Monoceros ring. Therefore, we find that a high eccentricity flyby by a
satellite galaxy represents a cosmologically appealing scenario for forming
kinematically distinct ring-like features around the Milky Way.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 15:43:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Younger",
"Joshua D.",
""
],
[
"Besla",
"Gurtina",
""
],
[
"Cox",
"T. J.",
""
],
[
"Hernquist",
"Lars",
""
],
[
"Robertson",
"Brant",
""
],
[
"Willman",
"Beth",
""
]
] | [
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] |
802.0873 | Keith S. M. Lee | Keith S. M. Lee | Subleading Shape-Function Effects and the Extraction of |V_ub| | 23 pages | Phys.Rev.D78:013002,2008 | 10.1103/PhysRevD.78.013002 | CALT-68-2664 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a class of formulae relating moments of B -> Xu l nu to B -> Xs
gamma in the shape function region, where m_X^2 ~ m_b Lambda_QCD. We also
derive an analogous class of formulae involving the decay B -> Xs l+ l-. These
results incorporate Lambda_QCD/m_b power corrections, but are independent of
leading and subleading hadronic shape functions. Consequently, they enable one
to determine |V_ub|/|V_tb V_ts*| to subleading order in a model-independent
way.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 19:52:14 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Dec 2008 01:18:47 GMT"
}
] | 2008-12-16T00:00:00 | [
[
"Lee",
"Keith S. M.",
""
]
] | [
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] |
802.0874 | Stephen Cenko | S. Bradley Cenko, Edo Berger, Ehud Nakar, Mansi M. Kasliwal, Antonio
Cucchiara, Shri R. Kulkarni, Eran Ofek, Derek B. Fox, Fiona A. Harrison, Arne
Rau, Paul A. Price, Avishay Gal-Yam, Michael A. Dopita, Bryan E. Penprase | GRBs 070429B and 070714B: The High End of the Short-Duration Gamma-Ray
Burst Redshift Distribution | ApJL submitted; 4 pages, 3 figures; Comments welcome | null | null | null | astro-ph | null | We present optical spectra of the host galaxies of the short-duration
gamma-ray burst GRB 070429B and the likely short-duration with extended
emission GRB 070714B. In both cases, we find a single emission line that we
identify as O II lambda 3727 at z ~ 0.9. Both events are more distant than any
previous short-duration GRB with a secure host association from the
sub-arcsecond position of an optical afterglow. GRBs 070429B and 070714B
provide strong evidence in support of our previous claims in Berger et al. that
a significant fraction of short-duration hosts (>~ 33%) reside at z > 0.7. We
discuss the implications of the existence this population on the energetics of
short-duration GRBs, as well as on progenitor models. In the context of the
degenerate binary merger scenario, such events require progenitor systems with
a range of lifetimes and disfavor progenitor models with a long, narrow
lifetime distribution.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 04:34:05 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Cenko",
"S. Bradley",
""
],
[
"Berger",
"Edo",
""
],
[
"Nakar",
"Ehud",
""
],
[
"Kasliwal",
"Mansi M.",
""
],
[
"Cucchiara",
"Antonio",
""
],
[
"Kulkarni",
"Shri R.",
""
],
[
"Ofek",
"Eran",
""
],
[
"Fox",
"Derek B.",
""
],
[
"Harrison",
"Fiona A.",
""
],
[
"Rau",
"Arne",
""
],
[
"Price",
"Paul A.",
""
],
[
"Gal-Yam",
"Avishay",
""
],
[
"Dopita",
"Michael A.",
""
],
[
"Penprase",
"Bryan E.",
""
]
] | [
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802.0875 | Ferenc Jarai-Szabo | F. Jarai-Szabo, Z. Neda, S. Astilean, C. Farcau, and A. Kuttesch | Shake-induced order in nanosphere systems | 7 pages, 10 figures | Eur. Phys. J. E 23, 153-159 (2007) | 10.1140/epje/i2006-10194-9 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-assembled patterns obtained from a drying nanosphere suspension are
investigated by computer simulations and simple experiments. Motivated by the
earlier experimental results of Sasaki and Hane and Schope, we confirm that
more ordered triangular lattice structures can be obtained whenever a moderate
intensity random shaking is applied on the drying system. Computer simulations
are realized on an improved version of a recently elaborated
Burridge-Knopoff-type model. Experiments are made following the setup of Sasaki
and Hane, using ultrasonic radiation as source for controlled shaking.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 21:05:25 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Jarai-Szabo",
"F.",
""
],
[
"Neda",
"Z.",
""
],
[
"Astilean",
"S.",
""
],
[
"Farcau",
"C.",
""
],
[
"Kuttesch",
"A.",
""
]
] | [
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802.0876 | Roman Zwicky | Franz Muheim, Yuehong Xie, Roman Zwicky | Exploiting the width difference in B_s -> phi gamma | 13 pages, 2 figures | Phys.Lett.B664:174-179,2008 | 10.1016/j.physletb.2008.05.032 | IPPP/08/04, DCPT/08/08 | hep-ph | null | The photon polarization in B -> V gamma is a sensitive probe of right-handed
currents. In the time dependent decay rate of B_s -> phi gamma the coefficients
S and H in front of the sin(Delta m_s t) and the sinh(Delta Gamma_s /2 t) terms
are sensitive to those right-handed currents. As compared to the B_d system
there is a sizable width difference in B_s mesons which leads to the additional
measurable observable H. We show with a Monte Carlo simulation that the
expected resolution on S and H will be about 0.15 at the LHCb experiment for
Delta Gamma_s/Gamma_s = 0.15 and a data sample of 2 fb^{-1}. We also show that
the observable H can be measured from the untagged decay rate of B_s mesons
which has considerable experimental advantages as no flavour tag will be
required. The resolution on H is inversely proportional to the B_s width
difference Delta Gamma_s. These experimental prospects have to be compared with
the Standard Model predictions S_{phi gamma} = 0 \pm 0.002 and H_{phi \gamma} =
0.047 \pm 0.025+0.015 presented in this paper. We also give the Standard Model
prediction and the experimental sensitivity for the direct CP asymmetry in B_s
-> phi gamma.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 22:42:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Muheim",
"Franz",
""
],
[
"Xie",
"Yuehong",
""
],
[
"Zwicky",
"Roman",
""
]
] | [
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802.0877 | Nelson David Padilla | Nelson D. Padilla (1) and Michael A. Strauss (2) ((1) Pontificia
Universidad Catolica de Chile, (2) Princeton University) | The shapes of galaxies in the Sloan Digital Sky Survey | 18 pages, 14 figures, accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.388:1321-1334,2008 | 10.1111/j.1365-2966.2008.13480.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the underlying shapes of spiral and elliptical galaxies in the
Sloan Digital Sky Survey Data Release 6 from the observed distribution of
projected galaxy shapes, taking into account the effects of dust extinction and
reddening. We assume that the underlying shapes of spirals and ellipticals are
well approximated by triaxial ellipsoids. The elliptical galaxy data are
consistent with oblate spheroids, with a correlation between luminosity and
ellipticity: the mean values of minor to middle axis ratios are 0.41+-0.03 for
Mr ~ -18 ellipticals, and 0.76+-0.04 for Mr ~-22.5 ellipticals. Ellipticals
show almost no dependence of axial ratio on galaxy colour, implying a
negligible dust optical depth.
There is a strong variation of spiral galaxy shapes with colour indicating
the presence of dust. The intrinsic shapes of spiral galaxies in the SDSS-DR6
are consistent with flat disks with a mean and dispersion of thickness to
diameter ratio of (21+-2)%, and a face-on ellipticity, e, of ln(e)=-2.33+-0.79.
Not including the effects of dust in the model leads to disks that are
systematically rounder by up to 60%. More luminous spiral galaxies tend to have
thicker and rounder disks than lower-luminosity spirals. Both elliptical and
spiral galaxies tend to be rounder for larger galaxies.
The marginalised value of the edge-on r-band dust extinction E_0 in spiral
galaxies is E_0 ~ 0.45 magnitudes for galaxies of median colours, increasing to
E_0=1 magnitudes for g-r>0.9 and E_0=1.9 for the luminous and most compact
galaxies, with half-light radii <2kpc/h.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 21:23:13 GMT"
},
{
"version": "v2",
"created": "Mon, 19 May 2008 14:19:57 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Padilla",
"Nelson D.",
""
],
[
"Strauss",
"Michael A.",
""
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802.0878 | Nero Budur | Nero Budur | Jumping numbers of hyperplane arrangements | example added | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | M. Saito recently proved that the jumping numbers of a hyperplane arrangement
depend only on the combinatorics of the arrangement. However, a formula in
terms of the combinatorial data was still missing. In this note, we give a
formula and a different proof of the fact that the jumping numbers of a
hyperplane arrangement depend only on the combinatorics. We also give a
combinatorial formula for part of the Hodge spectrum and for the inner jumping
multiplicities.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 21:27:36 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 00:46:07 GMT"
},
{
"version": "v3",
"created": "Fri, 19 Sep 2008 19:12:45 GMT"
}
] | 2008-09-19T00:00:00 | [
[
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""
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] |
802.0879 | Kristen Shapiro | K. L. Shapiro, R. Genzel, N. M. Forster Schreiber, L. J. Tacconi, N.
Bouche, G. Cresci, R. Davies, F. Eisenhauer, P. H. Johansson, D. Krajnovic,
D. Lutz, T. Naab, N. Arimoto, S. Arribas, A. Cimatti, L. Colina, E. Daddi, O.
Daigle, D. Erb, O. Hernandez, X. Kong, M. Mignoli, M. Onodera, A. Renzini, A.
Shapley, C. Steidel | Kinemetry of SINS High-Redshift Star-Forming Galaxies: Distinguishing
Rotating Disks from Major Mergers | Accepted for publication in the Astrophysical Journal. 24 pages, 14
figures | null | 10.1086/587133 | null | astro-ph | null | We present a simple set of kinematic criteria that can distinguish between
galaxies dominated by ordered rotational motion and those involved in major
merger events. Our criteria are based on the dynamics of the warm ionized gas
(as traced by H-alpha) within galaxies, making this analysis accessible to
high-redshift systems, whose kinematics are primarily traceable through
emission features. Using the method of kinemetry (developed by Krajnovic and
co-workers), we quantify asymmetries in both the velocity and velocity
dispersion maps of the warm gas, and the resulting criteria enable us to
empirically differentiate between non-merging and merging systems at high
redshift. We apply these criteria to 11 of our best-studied rest-frame
UV/optical-selected z~2 galaxies for which we have near infrared integral field
spectroscopic data from SINFONI on the VLT. Of these 11 systems, we find that
>50% have kinematics consistent with a single rotating disk interpretation,
while the remaining systems are more likely undergoing major mergers. This
result, combined with the short formation timescales of these systems, provides
evidence that rapid, smooth accretion of gas plays a significant role in galaxy
formation at high redshift.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:33:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shapiro",
"K. L.",
""
],
[
"Genzel",
"R.",
""
],
[
"Schreiber",
"N. M. Forster",
""
],
[
"Tacconi",
"L. J.",
""
],
[
"Bouche",
"N.",
""
],
[
"Cresci",
"G.",
""
],
[
"Davies",
"R.",
""
],
[
"Eisenhauer",
"F.",
""
],
[
"Johansson",
"P. H.",
""
],
[
"Krajnovic",
"D.",
""
],
[
"Lutz",
"D.",
""
],
[
"Naab",
"T.",
""
],
[
"Arimoto",
"N.",
""
],
[
"Arribas",
"S.",
""
],
[
"Cimatti",
"A.",
""
],
[
"Colina",
"L.",
""
],
[
"Daddi",
"E.",
""
],
[
"Daigle",
"O.",
""
],
[
"Erb",
"D.",
""
],
[
"Hernandez",
"O.",
""
],
[
"Kong",
"X.",
""
],
[
"Mignoli",
"M.",
""
],
[
"Onodera",
"M.",
""
],
[
"Renzini",
"A.",
""
],
[
"Shapley",
"A.",
""
],
[
"Steidel",
"C.",
""
]
] | [
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] |
802.088 | William Donnelly | William Donnelly | Entanglement Entropy in Loop Quantum Gravity | 4 pages, no figures | Phys.Rev.D77:104006,2008 | 10.1103/PhysRevD.77.104006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The entanglement entropy between quantum fields inside and outside a black
hole horizon is a promising candidate for the microscopic origin of black hole
entropy. We show that the entanglement entropy may be defined in loop quantum
gravity, and compute its value for spin network states. The entanglement
entropy for an arbitrary region of space is expressed as a sum over punctures
where the spin network intersects the region's boundary. Our result agrees
asymptotically with results previously obtained from the isolated horizon
framework, and we give a justification for this agreement. We conclude by
proposing a new method for studying corrections to the area law and its
implications for quantum corrections to the gravitational action.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 21:44:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Donnelly",
"William",
""
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802.0881 | Jeffrey Herfindal | Jeffrey Herfindal and Joanna Rankin | Deep Analyses of Nulling in Arecibo Pulsars Reveal Further Periodic
Behavior | 5 pages, 2 figures, 2 tables, uses mn2e.cls | null | 10.1111/j.1365-2966.2008.14119.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sensitive Arecibo observations provide an unprecedented ability to detect
nulls for an accurate pulse-modulation quelling (PMQ) analysis. We demonstrate
that a number of conal pulsars show "periodic nulling" similar to the
phenomenon found earlier in pulsar B1133+16.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 21:58:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Herfindal",
"Jeffrey",
""
],
[
"Rankin",
"Joanna",
""
]
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802.0882 | John R. Clem | John R. Clem | Field and current distributions and ac losses in a bifilar stack of
superconducting strips | 8 pages, 9 figures | Phys. Rev. B 77, 134506 (2008) | 10.1103/PhysRevB.77.134506 | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper I first analytically calculate the magnetic-field and
sheet-current distributions generated in an infinite stack of thin
superconducting strips of thickness d, width 2a >> d, and arbitrary separation
D when adjacent strips carry net current of magnitude I in opposite directions.
Each strip is assumed to have uniform critical current density Jc, critical
sheet-current density Kc = Jc d, and critical current Ic = 2a Kc, and the
distribution of the current density within each strip is assumed to obey
critical-state theory. I then derive expressions for the ac losses due to
magnetic-flux penetration both from the strip edges and from the top and bottom
of each strip, and I express the results in terms of integrals involving the
perpendicular and parallel components of the magnetic field. After numerically
evaluating the ac losses for typical dimensions, I present analytic expressions
from which the losses can be estimated.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 22:05:55 GMT"
}
] | 2010-08-31T00:00:00 | [
[
"Clem",
"John R.",
""
]
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802.0883 | Henry Wilton | Henry Wilton | Residually free 3-manifolds | 19 pages, referee's comments incorporated, to appear in Algebraic &
Geometric Topology | Algebr. Geom. Topol. 8 (2008) 2031-2047 | 10.2140/agt.2008.8.2031 | null | math.GT math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We classify those compact 3-manifolds with incompressible toral boundary
whose fundamental groups are residually free. For example, if such a manifold
$M$ is prime and orientable and the fundamental group of $M$ is non-trivial
then $M \cong \Sigma\times S^1$, where $\Sigma$ is a surface.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 22:21:15 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Sep 2008 23:37:24 GMT"
}
] | 2014-10-01T00:00:00 | [
[
"Wilton",
"Henry",
""
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] |
802.0884 | Jungkai Alfred Chen | Jungkai A. Chen and Christopher D. Hacon | On the geography of threefolds of general type | null | null | null | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $X$ be a complex nonsingular projective 3-fold of general type. We show
that there are positive constants $c$, $c'$ and $m_1$ such that $\chi (\omega
_X)\geq -c\Vol (X)$ and $P_m(X)\geq c'm^3\Vol (X)$ for all $m\geq m_1$.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 22:25:36 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Chen",
"Jungkai A.",
""
],
[
"Hacon",
"Christopher D.",
""
]
] | [
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802.0885 | Keisuke Goda | Keisuke Goda, Daniel R. Solli, and Bahram Jalali | Amplified Dispersive Optical Tomography | 7 pages, 5 figures | null | null | null | physics.optics physics.med-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Optical coherence tomography (OCT) has proven to be a powerful technique for
studying tissue morphology in ophthalmology, cardiology, and endomicroscopy.
Its performance is limited by the fundamental trade-off between the imaging
sensitivity and acquisition speed -- a predicament common in virtually all
imaging systems. In this paper, we circumvent this limit by using distributed
Raman post-amplification of the reflection from the sample. We combine the
amplification with simultaneously performed dispersive Fourier transformation,
a process that maps the optical spectrum into an easily measured time-domain
waveform. The Raman amplification enables measurement of weak signals which are
otherwise buried in noise. It extends the depth range without sacrificing the
acquisition speed or causing damage to the sample. As proof of concept,
single-shot imaging with 15 dB improvement in sensitivity at an axial scan rate
of 36.6 MHz is demonstrated.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 22:26:38 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Feb 2008 02:23:56 GMT"
}
] | 2008-02-27T00:00:00 | [
[
"Goda",
"Keisuke",
""
],
[
"Solli",
"Daniel R.",
""
],
[
"Jalali",
"Bahram",
""
]
] | [
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] |
802.0886 | Daniel Nagaj | Daniel Nagaj, Pawel Wocjan | Hamiltonian Quantum Cellular Automata in 1D | explanation in Section II largely rewritten, 2 new figures, accepted
for publication in PRA | Phys. Rev. A 78, 032311 (2008) | 10.1103/PhysRevA.78.032311 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a simple translationally invariant, nearest-neighbor Hamiltonian
on a chain of 10-dimensional qudits that makes it possible to realize universal
quantum computing without any external control during the computational
process. We only require the ability to prepare an initial computational basis
state which encodes both the quantum circuit and its input. The computational
process is then carried out by the autonomous Hamiltonian time evolution. After
a time polynomially long in the size of the quantum circuit has passed, the
result of the computation is obtained with high probability by measuring a few
qudits in the computational basis. This result also implies that there cannot
exist efficient classical simulation methods for generic translationally
invariant nearest-neighbor Hamiltonians on qudit chains, unless quantum
computers can be efficiently simulated by classical computers (or, put in
complexity theoretic terms, unless BPP=BQP).
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 22:35:51 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Apr 2008 18:41:28 GMT"
},
{
"version": "v3",
"created": "Fri, 25 Apr 2008 14:56:16 GMT"
},
{
"version": "v4",
"created": "Thu, 14 Aug 2008 08:35:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nagaj",
"Daniel",
""
],
[
"Wocjan",
"Pawel",
""
]
] | [
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] |
802.0887 | Aongus \'O Murchadha | Francis Halzen, Aongus O'Murchadha | Neutrinos from Auger Sources | 4 pages, LaTeX file using RevTEX4, 1 B/W .eps figure, typos corrected | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Pierre Auger observatory has presented evidence that the arrival
directions of cosmic rays with energies in excess of 6x10^7 TeV may be
correlated with nearby active galactic nuclei (AGN). In this context we revisit
a suggestion based on gamma ray observations that nearby Fanaroff-Riley I
galaxies such as Cen A and M87 are the sources of the local cosmic rays. We
compute the accompanying neutrino flux and find a flux within reach of
second-generation kilometer-scale neutrino telescopes.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 22:40:46 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 21:18:48 GMT"
}
] | 2008-02-28T00:00:00 | [
[
"Halzen",
"Francis",
""
],
[
"O'Murchadha",
"Aongus",
""
]
] | [
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] |
802.0888 | Lewis Hyatt | CAPMAP Collaboration: C. Bischoff, L. Hyatt, J. J. McMahon, G. W.
Nixon, D. Samtleben, K. M. Smith, K. Vanderlinde, D. Barkats, P. Farese, T.
Gaier, J. O. Gundersen, M. M. Hedman, S. T. Staggs, and B. Winstein | New Measurements of Fine-Scale CMB Polarization Power Spectra from
CAPMAP at Both 40 and 90 GHz | 19 pages, 17 figures, 2 tables, submitted to ApJ | Astrophys.J.684:771-789,2008 | 10.1086/590487 | null | astro-ph | null | We present new measurements of the cosmic microwave background (CMB)
polarization from the final season of the Cosmic Anisotropy Polarization MAPper
(CAPMAP). The data set was obtained in winter 2004-2005 with the 7 m antenna in
Crawford Hill, New Jersey, from 12 W-band (84-100 GHz) and 4 Q-band (36-45 GHz)
correlation polarimeters with 3.3' and 6.5' beamsizes, respectively. After
selection criteria were applied, 956 (939) hours of data survived for analysis
of W-band (Q-band) data. Two independent and complementary pipelines produced
results in excellent agreement with each other. A broad suite of null tests as
well as extensive simulations showed that systematic errors were minimal, and a
comparison of the W-band and Q-band sky maps revealed no contamination from
galactic foregrounds. We report the E-mode and B-mode power spectra in 7 bands
in the range 200 < l < 3000, extending the range of previous measurements to
higher l. The E-mode spectrum, which is detected at 11 sigma significance, is
in agreement with cosmological predictions and with previous work at other
frequencies and angular resolutions. The BB power spectrum provides one of the
best limits to date on B-mode power at 4.8 uK^2 (95% confidence).
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 20:45:48 GMT"
}
] | 2010-05-12T00:00:00 | [
[
"CAPMAP Collaboration",
"",
""
],
[
"Bischoff",
"C.",
""
],
[
"Hyatt",
"L.",
""
],
[
"McMahon",
"J. J.",
""
],
[
"Nixon",
"G. W.",
""
],
[
"Samtleben",
"D.",
""
],
[
"Smith",
"K. M.",
""
],
[
"Vanderlinde",
"K.",
""
],
[
"Barkats",
"D.",
""
],
[
"Farese",
"P.",
""
],
[
"Gaier",
"T.",
""
],
[
"Gundersen",
"J. O.",
""
],
[
"Hedman",
"M. M.",
""
],
[
"Staggs",
"S. T.",
""
],
[
"Winstein",
"B.",
""
]
] | [
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802.0889 | Lauren Williams | Konstanze Rietsch, Lauren Williams | The totally nonnegative part of G/P is a CW complex | 14 pages | null | null | null | math.AG | null | The totally nonnegative part of a partial flag variety G/P has been shown by
the first author to be a union of semi-algebraic cells. Moreover she showed
that the closure of a cell is the union of smaller cells. In this note we
provide glueing maps for each of the cells to prove that the totally
nonnegative part of G/P is a CW complex. This generalizes a result of
Postnikov, Speyer and the second author for Grassmannians.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 06:20:54 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Rietsch",
"Konstanze",
""
],
[
"Williams",
"Lauren",
""
]
] | [
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802.089 | Brahim Bouya | Brahim Bouya | Closed ideals in some algebras of analytic functions | 19 pages | Can. j. math. 61 (2009) 282-298 | 10.4153/CJM-2009-014-5 | null | math.CV math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a complete description of closed ideals of the algebra
$\mathcal{D}\cap \mathrm{lip}_\alpha},$ $0<\alpha\leq{1/2},$ where
$\mathcal{D}$ is the Dirichlet space and $\mathrm{lip}_\alpha}$ is the algebra
of analytic functions satisfying the Lipschitz condition of order $\alpha.$
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:08:03 GMT"
}
] | 2019-06-12T00:00:00 | [
[
"Bouya",
"Brahim",
""
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802.0891 | Luigi Del Debbio | Luigi Del Debbio, Mads T. Frandsen, Haralambos Panagopoulos, Francesco
Sannino | Higher representations on the lattice: perturbative studies | 22 pages, 4 figures | JHEP0806:007,2008 | 10.1088/1126-6708/2008/06/007 | NI08005 | hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present analytical results to guide numerical simulations with Wilson
fermions in higher representations of the colour group. The ratio of $\Lambda$
parameters, the additive renormalization of the fermion mass, and the
renormalization of fermion bilinears are computed in perturbation theory,
including cactus resummation. We recall the chiral Lagrangian for the different
patterns of symmetry breaking that can take place with fermions in higher
representations, and discuss the possibility of an Aoki phase as the fermion
mass is reduced at finite lattice spacing.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:11:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Del Debbio",
"Luigi",
""
],
[
"Frandsen",
"Mads T.",
""
],
[
"Panagopoulos",
"Haralambos",
""
],
[
"Sannino",
"Francesco",
""
]
] | [
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802.0892 | Brahim Bouya | Brahim Bouya | Closed ideals in analytic weighted Lipschitz algebras | 22 pages | null | null | null | math.CV math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a complete description of closed ideals in weighted Lipschitz
algebras $\Lambda_\omega$ of analytic functions on the unit disk satisfying the
following condition $$\frac{|f(z)-f(w)|}{\omega(|z-w|)}=o(1)\qquad(as |z-w|
\longrightarrow 0),$$ where $\omega$ is a modulus of continuity satisfying some
regularity conditions.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:25:28 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Bouya",
"Brahim",
""
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802.0893 | Roald Guandalini | R. Guandalini, M. Busso and M. Cardinali (Dipartimento di Fisica,
Universit\'a di Perugia) | On the Luminosity and Mass Loss of Galactic AGB Stars | 6 pages, 4 figures, Contribution from the Conference: "Why Galaxies
Care About AGB Stars: Their Importance as Actors and Probes", held 7-11
August 2006 at University Campus, Vienna, Austria | ASP Conf.Ser.378:245,2007 | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As part of a reanalysis of Galactic Asymptotic Giant Branch stars (hereafter
AGB stars) at infrared wavelengths, we discuss here two samples (the first of
carbon-rich stars, the second of S stars) for which photometry in the near- and
mid-IR and distance estimates are available. Whenever possible we searched also
for mass-loss rates. The observed spectral energy distributions extended in all
cases up to 20 $\mu$m and for the best-observed sources up to 45 $\mu$m. The
wide wavelength coverage allows us to obtain reliable bolometric corrections,
and hence bolometric magnitudes. We show that mid-IR fluxes are crucial for
estimating bolometric magnitudes for stars with dusty envelopes and that the
so-called luminosity problem of C stars (i.e. the suggestion that they are less
luminous than predicted by models) does not appear to exist.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:26:16 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Guandalini",
"R.",
"",
"Dipartimento di Fisica,\n Universitá di Perugia"
],
[
"Busso",
"M.",
"",
"Dipartimento di Fisica,\n Universitá di Perugia"
],
[
"Cardinali",
"M.",
"",
"Dipartimento di Fisica,\n Universitá di Perugia"
]
] | [
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802.0894 | Zurab Tavartkiladze | Berthold Stech, Zurab Tavartkiladze | Generation Symmetry and E_6 Unification | RevTex, typos corrected, refs. added. To appear in Phys Rev D | Phys.Rev.D77:076009,2008 | 10.1103/PhysRevD.77.076009 | HD-THEP-08-08, OSU-HEP-08-01 | hep-ph | null | The group E_6 for grand unification is combined with the generation symmetry
group SO(3)_g. The coupling matrices in the Yukawa interaction are identified
with the vacuum expectation values of scalar fields which are representations
of the generation symmetry. These values determine the hierarchy of the
fermions as well as their mixings and CP-violation. This generation mixing
appears in conjunction with the mixing of the standard model fermions with the
heavy fermions present in the lowest representation of E_6. A close connection
between charged and neutral fermions is observed relating for instance the CKM
mixings with the mass splittings of the light neutrinos. Numerical fits with
only few parameters reproduce quantitatively all known fermion properties. The
model predicts an inverted neutrino hierarchy and gives rather strict values
for the light and heavy neutrino masses as well as for the 0\nu 2\beta decay
parameter. It also predicts that the masses of the two lightest of six `right
handed' neutrinos lie in the low TeV region.
| [
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"created": "Wed, 6 Feb 2008 23:55:00 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 07:29:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Stech",
"Berthold",
""
],
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""
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802.0895 | Erik Talvila | Erik Talvila | Review of "Garden of integrals" | null | null | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a review of the book "Garden of integrals" by Frank Burk.
| [
{
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] |
802.0896 | Stefan Zohren | J. Ambjorn, R. Loll, Y. Watabiki, W. Westra, S. Zohren | Topology change in causal quantum gravity | 4 pages, proceedings of the workshop JGRG 17 (Nagoya, Japan, December
2007) | null | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of topology change in a fundamental theory of quantum gravity is
still a matter of debate. However, when regarding string theory as
two-dimensional quantum gravity, topological fluctuations are essential. Here
we present a third quantization of two-dimensional surfaces based on the method
of causal dynamical triangulation (CDT). Formally, our construction is similar
to the c = 0 non-critical string field theory developed by Ishibashi, Kawai and
others, but physically it is quite distinct. Unlike in non-critical string
theory the topology change of spatial slices is well controlled and regulated
by Newton's constant.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:43:31 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Ambjorn",
"J.",
""
],
[
"Loll",
"R.",
""
],
[
"Watabiki",
"Y.",
""
],
[
"Westra",
"W.",
""
],
[
"Zohren",
"S.",
""
]
] | [
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] |
802.0897 | Joaquim Matias | Alakabha Datta (Mississippi U.), David London (Montreal U), Joaquim
Matias (UAB & IFAE), Makiko Nagashima and Alejandro Szynkman (Montreal U) | Final-state Polarization in Bs Decays | 6 pages | Eur.Phys.J.C60:279-284,2009 | 10.1140/epjc/s10052-009-0883-8 | UMISS-HEP-2008-02, UdeM-GPP-TH-08-167, UAB-FT-646 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Certain Bs --> V_1V_2 decays (V_i is a vector meson) can be related by flavor
SU(3) symmetry to corresponding Bd --> V_3V_4 decays. In this paper, we show
that the final-state polarization can be predicted in the Bs decay, assuming
polarization measurements of the Bd decay. This can be done within the scenario
of penguin annihilation (PA), which has been suggested as an explanation of the
unexpectedly large transverse polarization in B-->phi K^*. PA is used to
estimate the breaking of flavor SU(3) symmetry in pairs of decays. Two of these
for which PA makes a reasonably precise prediction of the size of SU(3)
breaking are (Bs --> phiphi, Bd --> phi K^{0*}) and (Bs --> phi {\bar K}^{0*},
Bd --> {\bar K}^{0*} K^{0*}). The polarization measurement in the Bd decay can
be used to predict the transverse polarization in the Bs decay, and will allow
a testing of PA.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:58:25 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Oct 2008 15:16:48 GMT"
}
] | 2009-03-24T00:00:00 | [
[
"Datta",
"Alakabha",
"",
"Mississippi U."
],
[
"London",
"David",
"",
"Montreal U"
],
[
"Matias",
"Joaquim",
"",
"UAB & IFAE"
],
[
"Nagashima",
"Makiko",
"",
"Montreal U"
],
[
"Szynkman",
"Alejandro",
"",
"Montreal U"
]
] | [
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] |
802.0898 | Brahim Bouya | B. Bouya, O. El-Fallah, K. Kellay | Ideaux fermes d'algebres de Beurling analytiques sur le bidisque | 17 pages | null | null | null | math.CV math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the closed ideal in the Beurling algebras
$\mathcal{A}^{+}_{\alpha,\beta}$ of holomorphic function $f$ in the bidisc such
that $\sum_{n,m\geq 0}|\hat{f}(n,m)|(1+n)^{\alpha}(1+m)^\beta<+\infty$. We
determine the function $f\in\mathcal{A}^{+}_{\alpha,\beta}$ such that the
ideals generated by $f$ coincide with the ideal generated by their zeros set.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:49:03 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Bouya",
"B.",
""
],
[
"El-Fallah",
"O.",
""
],
[
"Kellay",
"K.",
""
]
] | [
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802.0899 | Yasuko S. Honda | Mitsuru Honda | Phase-transient hierarchical turbulence as an energy correlation
generator of blazar light curves | 5 pages, 3 figures, accepted for publication in ApJ Letters | Astrophys.J. 675 (2008) L61-L64 | 10.1086/533528 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hierarchical turbulent structure constituting a jet is considered to
reproduce energy-dependent variability in blazars, particularly, the
correlation between X- and gamma-ray light curves measured in the TeV blazar
Markarian 421. The scale-invariant filaments are featured by the ordered
magnetic fields that involve hydromagnetic fluctuations serving as electron
scatterers for diffusive shock acceleration, and the spatial size scales are
identified with the local maximum electron energies, which are reflected in the
synchrotron spectral energy distribution (SED) above the near-infrared/optical
break. The structural transition of filaments is found to be responsible for
the observed change of spectral hysteresis.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:54:14 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Apr 2008 01:37:32 GMT"
}
] | 2008-04-10T00:00:00 | [
[
"Honda",
"Mitsuru",
""
]
] | [
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] |
802.09 | William East | Vah\'e Petrosian and William E. East | Heating and Acceleration of Intracluster Medium Electrons by Turbulence | 28 pages, 7 figures. Astrophysical Journal, in press | Astrophys. J. Vol 682, 175 (2008) | 10.1086/588424 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the feasibility of bremsstrahlung radiation from
`nonthermal' electrons as a source of hard X-rays from the intracluster medium
of clusters of galaxies. With an exact treatment of the Coulomb collisions in a
Fokker-Planck analysis of the electron distribution we find that the severe
difficulties with lifetimes of `nonthermal' particles found earlier by
Petrosian (2001) using a cold target model remain problematic. We then address
possible acceleration of background electrons into a nonthermal tail. We assume
a simplified but generic acceleration rate and determine the expected evolution
of an initially Maxwellian distribution of electrons. We find that strong
nonthermal components arise only for rapid rate of acceleration which also
heats up the entire plasma. These results confirm the conclusion that if the
observed `nonthermal' excesses are due to some process accelerating the
background thermal electrons this process must be short lived.
| [
{
"version": "v1",
"created": "Wed, 6 Feb 2008 23:57:00 GMT"
}
] | 2013-03-08T00:00:00 | [
[
"Petrosian",
"Vahé",
""
],
[
"East",
"William E.",
""
]
] | [
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] |
802.0901 | Sebastian Schmidt | S. Schmidt, Y. Alhassid | Mesoscopic competition of superconductivity and ferromagnetism:
conductance peak statistics in metallic grains | 4 pages, 3 figures | Phys. Rev. Lett. 101, 207003 (2008) | 10.1103/PhysRevLett.101.207003 | null | cond-mat.mes-hall cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the competition between superconductivity and ferromagnetism
in chaotic ultra-small metallic grains in a regime where both phases can
coexist. We use an effective Hamiltonian that combines a BCS-like pairing term
and a ferromagnetic Stoner-like spin exchange term. We study the transport
properties of the grain in the Coulomb blockade regime and identify signatures
of the coexistence between pairing and exchange correlations in the mesoscopic
fluctuations of the conductance peak spacings and peak heights.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 01:51:17 GMT"
}
] | 2009-08-27T00:00:00 | [
[
"Schmidt",
"S.",
""
],
[
"Alhassid",
"Y.",
""
]
] | [
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802.0902 | Erin Jollley Mrs | Erin Jolley and Zdenka Kuncic | Jet enhanced accretion growth of supermassive black holes | null | null | 10.1111/j.1365-2966.2008.13082.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of a disc-driven jet on the accretion growth of
cosmological supermassive black holes (SMBHs). The presence of a jet enhances
the mass growth rate because for a given luminosity, the mass accretion rate,
is higher (or equivalently, the radiative efficiency e_r is lower for a fixed
mass accretion rate) than that predicted by standard accretion disc theory. As
jets carry away very little of the accreting matter, a larger proportion of the
rest mass can reach the black hole during episodes of jet activity. We show
quantitatively that the conditions required to grow a rapidly spinning black
hole to a mass ~ 10^9 solar masses by redshift z ~ 6, whilst satisfying the
observational constraint e_r > 0.1, are considerably less restrictive for
jet-enhanced disc accretion than for standard disc accretion, which requires
implausibly high super-Eddington accretion rates. Furthermore, jet-enhanced
accretion growth offers a viable explanation for the observed correlation
between black hole mass and radio-loudness of quasars.
| [
{
"version": "v1",
"created": "Thu, 7 Feb 2008 01:56:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jolley",
"Erin",
""
],
[
"Kuncic",
"Zdenka",
""
]
] | [
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