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712.1779
Nikolaos Mavromatos
J. Alexandre, K. Farakos, N. E. Mavromatos and P. Pasipoularides
Neutrino oscillations in a stochastic model for space-time foam
12 pages RevTex4, no figures
Phys.Rev.D77:105001,2008
10.1103/PhysRevD.77.105001
null
hep-ph astro-ph hep-th
null
We study decoherence models for flavour oscillations in four-dimensional stochastically fluctuating space times and discuss briefly the sensitivity of current neutrino experiments to such models. We pay emphasis on demonstrating the model dependence of the associated decoherence-induced damping coefficients in front of the oscillatory terms in the respective transition probabilities between flavours. Within the context of specific models of foam, involving point-like D-branes and leading to decoherence-induced damping which is inversely proportional to the neutrino energies, we also argue that future limits on the relevant decoherence parameters coming from TeV astrophysical neutrinos, to be observed in ICE-CUBE, are not far from theoretically expected values with Planck mass suppression. Ultra high energy neutrinos from Gamma Ray Bursts at cosmological distances can also exhibit in principle sensitivity to such effects.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 17:40:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Alexandre", "J.", "" ], [ "Farakos", "K.", "" ], [ "Mavromatos", "N. E.", "" ], [ "Pasipoularides", "P.", "" ] ]
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712.178
Charles Conley
Charles H. Conley
Conformal symbols and the action of contact vector fields over the superline
48 pages
J. reine angew. Math. 633 (2009), 115-163
10.1515/CRELLE.2009.062
null
math.RT math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let K be the Lie superalgebra of contact vector fields on the supersymmetric line. We compute the action of K on the modules of differential and pseudodifferential operators between spaces of tensor densities, in terms of their conformal symbols. As applications we deduce the geometric subsymbols, 1-cohomology, and various uniserial subquotients of these modules. We also outline the computation of the K-equivalences and symmetries of their subquotients.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 17:38:29 GMT" }, { "version": "v2", "created": "Mon, 24 Mar 2008 07:23:03 GMT" }, { "version": "v3", "created": "Thu, 10 Dec 2009 16:39:10 GMT" } ]
2014-12-31T00:00:00
[ [ "Conley", "Charles H.", "" ] ]
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712.1781
Jean-Francois Babadjian
Jean-Francois Babadjian, Vincent Millot
Homogenization of variational problems in manifold valued Sobolev spaces
22 pages
ESAIM Control, Optimisation and Calculus of Variations 16, no. 4 (2010), 833-855
null
null
math.AP
null
Homogenization of integral functionals is studied under the constraint that admissible maps have to take their values into a given smooth manifold. The notion of tangential homogenization is defined by analogy with the tangential quasiconvexity introduced by Dacorogna, Fonseca, Maly and Trivisa \cite{DFMT}. For energies with superlinear or linear growth, a $\Gamma$-convergence result is established in Sobolev spaces, the homogenization problem in the space of functions of bounded variation being the object of \cite{BM}.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 17:40:36 GMT" }, { "version": "v2", "created": "Thu, 3 Apr 2008 13:47:28 GMT" }, { "version": "v3", "created": "Tue, 22 Apr 2008 07:42:16 GMT" } ]
2013-10-31T00:00:00
[ [ "Babadjian", "Jean-Francois", "" ], [ "Millot", "Vincent", "" ] ]
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712.1782
Bjorn Poonen
Bjorn Poonen
Existence of rational points on smooth projective varieties
11 pages
J. Eur. Math. Soc. (JEMS) 11 (2009), no. 3, 529-543
10.4171/JEMS/159
null
math.NT math.AG
null
Fix a number field k. We prove that if there is an algorithm for deciding whether a smooth projective geometrically integral k-variety has a k-point, then there is an algorithm for deciding whether an arbitrary k-variety has a k-point and also an algorithm for computing X(k) for any k-variety X for which X(k) is finite. The proof involves the construction of a one-parameter algebraic family of Chatelet surfaces such that exactly one of the surfaces fails to have a k-point.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 17:50:46 GMT" } ]
2017-04-03T00:00:00
[ [ "Poonen", "Bjorn", "" ] ]
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712.1783
Q. H. Zhang
Qinghui Zhang, Alex Pevsner, Agung Hertanto, Yu-Chi Hu, Kenneth E. Rosenzweig, C. Clifton Ling, Gig S Mageras
A patient-specific respiratory model of anatomical motion for radiation treatment planning
18 pages, 9 figures
Med. Phys. 34, 4772 (2007)
10.1118/1.2804576
null
physics.med-ph
null
Modeling of respiratory motion is important for a more accurate understanding and accounting of its effect on dose to cancers in the thorax and abdomen by radiotherapy. We have developed a model of respiration-induced organ motion in the thorax, without the commonly adopted assumption of repeatable breath cycles. The model describes the motion of a volume of interest within the patient, based on a reference 3-dimensional image (at end-expiration), and the diaphragm positions at different time points. The input data are respiration-correlated CT images of patients treated for nonsmall cell lung cancer, consisting of 3D images, including the diaphragm positions, at 10 phases of the respiratory cycle. A deformable image registration algorithm calculates the deformation field that maps each 3D image to the reference 3D image. A principle component analysis is performed to parameterize the 3D deformation field in terms of the diaphragm motion. We show that the first two principal components are adequate to accurately and completely describe the organ motion in the data of 4 patients. Artifacts in the RCCT images that commonly occur at the mid-respiration states are reduced in the model-generated images. Further validation of the model is demonstrated in the successful application of the parameterized 3D deformation field to RCCT data of the same patient but acquired several days later. We have developed a method for predicting respiration-induced organ motion in patients that has potential for improving the accuracy of dose calculation in radiotherapy.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 17:54:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhang", "Qinghui", "" ], [ "Pevsner", "Alex", "" ], [ "Hertanto", "Agung", "" ], [ "Hu", "Yu-Chi", "" ], [ "Rosenzweig", "Kenneth E.", "" ], [ "Ling", "C. Clifton", "" ], [ "Mageras", "Gig S", "" ] ]
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712.1784
James McLaughlin
J. A. McLaughlin, A. W. Hood
Magnetohydrodynamics wave propagation in the neighbourhood of two dipoles
15 pages, 12 figures
Astron.Astrophys.452:603-613,2006
10.1051/0004-6361:20054575
null
astro-ph
null
This paper is the third in a series of investigations by the authors. The nature of fast magnetoacoustic and Alfv\'en waves is investigated in a 2D $\beta=0$ plasma in the neighbourhood of two dipoles. We use both numerical simulations (two-step Lax-Wendroff scheme) and analytical techniques (WKB approximation). It is found that the propagation of the linear fast wave is dictated by the Alfv\'en speed profile and that close to the null, the wave is attracted to the neutral point. However, it is also found that in this magnetic configuration some of the wave can escape the refraction effect; this had not been seen in previous investigations by the authors. The wave split occurs near the regions of very high Alfv\'en speed (found near the loci of the two dipoles). Also, for the set-up investigated it was found that 40% of the wave energy accumulates at the null. Ohmic dissipation will then extract the wave energy at this point. The Alfv\'en wave behaves in a different manner in that part of the wave accumulates along the separatrices and part escapes. Hence, the current density will accumulate at this part of the topology and this is where wave heating will occur. The phenomenon of wave accumulation at a specific place is a feature of both wave types, as is the result that a fraction of the wave can now escape the numerical box when propagating in this magnetic configuration.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 18:18:59 GMT" } ]
2009-06-25T00:00:00
[ [ "McLaughlin", "J. A.", "" ], [ "Hood", "A. W.", "" ] ]
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712.1785
Bjorn Poonen
Bjorn Poonen
The set of non-squares in a number field is diophantine
5 pages; corrected minor typos, improved exposition, added reference
Math. Res. Lett. 16 (2009), no. 1, 165-170
10.4310/MRL.2009.v16.n1.a16
null
math.NT math.AG
null
Fix a number field k. We prove that k* - k*^2 is diophantine over k. This is deduced from a theorem that for a nonconstant separable polynomial P(x) in k[x], there are at most finitely many a in k* modulo squares such that there is a Brauer-Manin obstruction to the Hasse principle for the conic bundle X given by y^2 - az^2 = P(x).
[ { "version": "v1", "created": "Tue, 11 Dec 2007 17:56:01 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 15:18:57 GMT" } ]
2017-04-03T00:00:00
[ [ "Poonen", "Bjorn", "" ] ]
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712.1786
Jonas Mureika
J. R. Mureika
Unparticle-Enhanced Black Holes at the LHC
15 pp, 2 figs (pdfLaTeX); v2 minor changes include some added references and discussion of new literature; to appear in Phys. Lett. B
Phys.Lett.B660:561-566,2008
10.1016/physletb.2008.01.050
null
hep-ph gr-qc hep-th
null
Based on the idea that tensor unparticles can enhance the gravitational interactions between standard model particles, potential black hole formation in high energy collisions is examined. Modifications to the horizon radius $r_H$ are derived, and the corresponding geometric cross-sections of such objects are calculated. It is shown that $r_H$ increases dramatically to the electroweak scale for masses $M_{BH} \sim 1-10 $TeV, yielding a geometric cross-section $\sigma_{BH}=\pi r_H^2$ on the order of $leq 50$ pb. This suggests that unparticle physics provides a mechanism for black hole formation in future accelerators, without the requirement of extra spatial dimensions.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 17:59:48 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 02:12:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Mureika", "J. R.", "" ] ]
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712.1787
Karim . A. Malik
Karim A. Malik, David Seery, and Kishore N. Ananda
Different approaches to the second order Klein-Gordon equation
9 pages, revtex4
Class.Quant.Grav.25:175008,2008
10.1088/0264-9381/25/17/175008
null
astro-ph
null
We derive the Klein--Gordon equation for a single scalar field coupled to gravity at second order in perturbation theory and leading order in slow-roll. This is done in two ways: we derive the Klein--Gordon equation first using the Einstein field equations, and then directly from the action after integrating out the constraint equations. We also point out an unexpected result regarding the treatment of the field equations.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 18:24:22 GMT" } ]
2009-06-23T00:00:00
[ [ "Malik", "Karim A.", "" ], [ "Seery", "David", "" ], [ "Ananda", "Kishore N.", "" ] ]
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712.1788
Degiorgi
M. Lavagnini, A. Sacchetti, L. Degiorgi, E. Arcangeletti, L. Baldassarre, P. Postorino, S. Lupi, A. Perucchi, K.Y. Shin and I.R. Fisher
Pressure dependence of the optical properties of the charge-density-wave compound LaTe$_2$
null
Phys. Rev. B77, 165132 (2008)
10.1103/PhysRevB.77.165132
null
cond-mat.str-el cond-mat.mtrl-sci
null
We report the pressure dependence of the optical response of LaTe$_2$, which is deep in the charge-density-wave (CDW) ground state even at 300 K. The reflectivity spectrum is collected in the mid-infrared spectral range at room temperature and at pressures between 0 and 7 GPa. We extract the energy scale due to the single particle excitation across the CDW gap and the Drude weight. We establish that the gap decreases upon compressing the lattice, while the Drude weight increases. This signals a reduction in the quality of nesting upon applying pressure, therefore inducing a lesser impact of the CDW condensate on the electronic properties of LaTe$_2$. The consequent suppression of the CDW gap leads to a release of additional charge carriers, manifested by the shift of weight from the gap feature into the metallic component of the optical response. On the contrary, the power-law behavior, seen in the optical conductivity at energies above the gap excitation and indicating a weakly interacting limit within the Tomonaga-Luttinger liquid scenario, seems to be only moderately dependent on pressure.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 18:17:52 GMT" } ]
2012-01-11T00:00:00
[ [ "Lavagnini", "M.", "" ], [ "Sacchetti", "A.", "" ], [ "Degiorgi", "L.", "" ], [ "Arcangeletti", "E.", "" ], [ "Baldassarre", "L.", "" ], [ "Postorino", "P.", "" ], [ "Lupi", "S.", "" ], [ "Perucchi", "A.", "" ], [ "Shin", "K. Y.", "" ], [ "Fisher", "I. R.", "" ] ]
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712.1789
Michael Bridges
M. Bridges, J.D. McEwen, M. Cruz, M.P. Hobson, A.N. Lasenby, P. Vielva, E. Martinez-Gonzalez
Bianchi VII_h models and the cold spot texture
5 pages, 3 figures, submitted to MNRAS letters
null
10.1111/j.1365-2966.2008.13835.x
null
astro-ph
null
We have returned to our previous Bianchi VII_h analysis in light of the Cruz et al. 2007 suggestion that the cold spot observed near the southern Galactic pole may be a remnant temperature perturbation of a cosmic texture. In Bridges et al. 2006b we found two favoured left handed Bianchi VII_h templates with restricted prior probabilities so that the template was centred close to the cold spot. Using WMAP data `corrected' for the texture fit we have now reexamined both models to assess any changes to these conclusions. We find that both models are left almost entirely unconstrained by the data and consequently exhibit significantly reduced Bayesian evidences. Both models are now disfavoured by the data. This result reinforces our previous suggestion that the cold spot was likely to be driving any Bianchi VII_h detection.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 18:34:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Bridges", "M.", "" ], [ "McEwen", "J. D.", "" ], [ "Cruz", "M.", "" ], [ "Hobson", "M. P.", "" ], [ "Lasenby", "A. N.", "" ], [ "Vielva", "P.", "" ], [ "Martinez-Gonzalez", "E.", "" ] ]
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712.179
Eugene Sherman
R.M. Abrarov, E.Ya. Sherman, and J.E. Sipe
Hydrodynamic model for relaxation of optically injected currents in quantum wells
9 pages, 4 figures; version slightly longer than published
Appl. Phys. Lett. 91, 232113 (2007)
10.1063/1.2805385
null
cond-mat.other
null
We use a hydrodynamic model to describe the relaxation of optically injected currents in quantum wells on a picosecond time scale, numerically solving the continuity and velocity evolution equations with the Hermite-Gaussian functions employed as a basis. The interplay of the long-range Coulomb forces and nonlinearity in the equations of motion leads to rather complex patterns of the calculated charge and current densities. We find that the time dependence of even the first moment of the electron density is sensitive to this complex evolution.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 18:41:47 GMT" } ]
2007-12-12T00:00:00
[ [ "Abrarov", "R. M.", "" ], [ "Sherman", "E. Ya.", "" ], [ "Sipe", "J. E.", "" ] ]
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712.1791
Thomas G. Rizzo
Thomas G. Rizzo
Unique Identification of Lee-Wick Gauge Bosons at Linear Colliders
16 pages, 6 figures; discussion and references added
JHEP 0801:042,2008
10.1088/1126-6708/2008/01/042
SLAC-PUB-13039
hep-ph
null
Grinstein, O'Connell and Wise have recently presented an extension of the Standard Model (SM), based on the ideas of Lee and Wick (LW), which demonstrates an interesting way to remove the quadratically divergent contributions to the Higgs mass induced by radiative corrections. This model predicts the existence of negative-norm copies of the usual SM fields at the TeV scale with ghost-like propagators and negative decay widths, but with otherwise SM-like couplings. In earlier work, it was demonstrated that the LW states in the gauge boson sector of these models, though easy to observe, cannot be uniquely identified as such at the LHC. In this paper, we address the issue of whether or not this problem can be resolved at an $e^+e^-$ collider with a suitable center of mass energy range. We find that measurements of the cross section and the left-right polarization asymmetry associated with Bhabha scattering can lead to a unique identification of the neutral electroweak gauge bosons of the Lee-Wick type.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 18:42:51 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 16:45:47 GMT" } ]
2009-05-08T00:00:00
[ [ "Rizzo", "Thomas G.", "" ] ]
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712.1792
James McLaughlin
J. A. McLaughlin, A. W. Hood
MHD wave propagation in the neighbourhood of a two-dimensional null point
12 pages, 14 figures
Astron.Astrophys.420:1129-1140,2004
10.1051/0004-6361:20035900
null
astro-ph
null
The nature of fast magnetoacoustic and Alfv\'en waves is investigated in a zero $\beta$ plasma. This gives an indication of wave propagation in the low $\beta$ solar corona. It is found that for a two-dimensional null point, the fast wave is attracted to that point and the front of the wave slows down as it approaches the null point, causing the current density to accumulate there and rise rapidly. Ohmic dissipation will extract the energy in the wave at this point. This illustrates that null points play an important role in the rapid dissipation of fast magnetoacoustic waves and suggests the location where wave heating will occur in the corona. The Alfv\'en wave behaves in a different manner in that the wave energy is dissipated along the separatrices. For Alfv\'en waves that are decoupled from fast waves, the value of the plasma $\beta$ is unimportant. However, the phenomenon of dissipating the majority of the wave energy at a specific place is a feature of both wave types.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:42:58 GMT" } ]
2009-06-25T00:00:00
[ [ "McLaughlin", "J. A.", "" ], [ "Hood", "A. W.", "" ] ]
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712.1793
Nikolas Akerblom
Nikolas Akerblom, Ralph Blumenhagen, Dieter Lust, Maximilian Schmidt-Sommerfeld
D-brane Instantons in 4D Supersymmetric String Vacua
16 pages, 3 figures. Contribution to the proceedings of the BW2007 Workshop "Challenges Beyond the Standard Model", September 2-9, 2007, Kladovo, Serbia
Fortsch.Phys.56:313-323,2008
10.1002/prop.200710501
MPP-2007-187, LMU-ASC 74/07
hep-th
null
We review some aspects of D-instantons in intersecting D-brane models. In particular, we present applications of the recently proposed instanton calculus to computations of charged matter superpotential couplings and corrections to the gauge kinetic function in the low energy effective action of type IIA orientifolds. As an interesting byway, we also discuss how one-loop corrections to the gauge kinetic function can be deduced from gauge threshold corrections in the type IIA setting.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:19:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Akerblom", "Nikolas", "" ], [ "Blumenhagen", "Ralph", "" ], [ "Lust", "Dieter", "" ], [ "Schmidt-Sommerfeld", "Maximilian", "" ] ]
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712.1794
Almar Kaid
Holger Brenner and Almar Kaid
On deep Frobenius descent and flat bundles
Significant changes in the proofs of Lemma 3.1 and Lemma 3.2
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let R be an integral domain of finite type over Z and let f:X --> Spec R be a smooth projective morphism of relative dimension d >= 1. We investigate, for a vector bundle E on the total space X, under what arithmetical properties of a sequence (p_n, e_n)_{n \in \NN}, consisting of closed points p_n in Spec R and Frobenius descent data E_{p_n} \cong F^{e_n}^*(F) on the closed fibers X_{p_n}, the bundle E_0 on the generic fiber X_0 is semistable.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 18:57:39 GMT" }, { "version": "v2", "created": "Fri, 13 Jun 2008 16:13:01 GMT" } ]
2008-06-13T00:00:00
[ [ "Brenner", "Holger", "" ], [ "Kaid", "Almar", "" ] ]
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712.1795
Fabio Riccioni
Fabio Riccioni and Peter West
E(11)-extended spacetime and gauged supergravities
81 pages, 2 figures. Refs added, two equations corrected, one equation added. Version published on JHEP
JHEP 0802:039,2008
10.1088/1126-6708/2008/02/039
KCL-MTH-07-17
hep-th
null
We formulate all the five dimensional gauged maximal supergravity theories as non-linear realisations of the semi-direct product of E_{11} and a set of generators which transform according to the first fundamental representation l of E_{11}. The latter introduces a generalised space-time which plays a crucial role for these theories. We derive the E_{11} and l transformations of all the form fields and their dynamics. We also formulate the five dimensional gauged supergravity theories using the closure of the supersymmetry algebra. We show that this closes on the bosonic field content predicted by E_{11} and we derive the field transformations and the dynamics of this theory. The results are in precise agreement with those found from the E_{11} formulation. This provides a very detailed check of E_{11} and also the first substantial evidence for the generalised space-time. The results can be generalised to all gauged maximal supergravities, thus providing a unified framework of all these theories as part of E_{11}.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:00:20 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 18:04:32 GMT" } ]
2010-02-03T00:00:00
[ [ "Riccioni", "Fabio", "" ], [ "West", "Peter", "" ] ]
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712.1796
Viktor Toth
J. W. Moffat and V. T. Toth
Fundamental parameter-free solutions in Modified Gravity
11 pages, 8 figures; accepted for publication in CQG
Class. Quantum Grav. 26 (2009) 085002
10.1088/0264-9381/26/8/085002
null
gr-qc astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modified Gravity (MOG) has been used successfully to explain the rotation curves of galaxies, the motion of galaxy clusters, the Bullet Cluster, and cosmological observations without the use of dark matter or Einstein's cosmological constant. We now have the ability to demonstrate how these solutions can be obtained directly from the action principle, without resorting to the use of fitted parameters or empirical formulae. We obtain numerical solutions to the theory's field equations that are exact in the sense that no terms are omitted, in two important cases: the spherically symmetric, static vacuum solution and the cosmological case of an homogeneous, isotropic universe. We compare these results to selected astrophysical and cosmological observations.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:19:03 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 20:11:52 GMT" }, { "version": "v3", "created": "Mon, 5 May 2008 22:46:33 GMT" }, { "version": "v4", "created": "Sun, 1 Jun 2008 17:24:47 GMT" }, { "version": "v5", "created": "Fri, 27 Feb 2009 15:46:16 GMT" } ]
2009-04-04T00:00:00
[ [ "Moffat", "J. W.", "" ], [ "Toth", "V. T.", "" ] ]
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712.1797
Michael Williams
Michael J. Williams
Lens space surgeries & primitive/Seifert type constructions
18 pages, 8 figures
null
null
null
math.GT
null
We show that lens space surgeries on knots in $S^3$ which arise from the primitive/Seifert type construction also arise from the primitive/primitive construction. This is the first step of a three step program to prove the Berge conjecture for tunnel number one knots.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:43:33 GMT" } ]
2007-12-12T00:00:00
[ [ "Williams", "Michael J.", "" ] ]
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712.1798
Iv\'an Calvo
Ivan Calvo, Raul Sanchez, Benjamin A. Carreras, Boudewijn Ph. van Milligen
Fractional generalization of Fick's law: a microscopic approach
4 pages. Published version
Phys. Rev. Lett. 99, 230603 (2007)
10.1103/PhysRevLett.99.230603
null
cond-mat.stat-mech
null
In the study of transport in inhomogeneous systems it is common to construct transport equations invoking the inhomogeneous Fick law. The validity of this approach requires that at least two ingredients be present in the system. First, finite characteristic length and time scales associated to the dominant transport process must exist. Secondly, the transport mechanism must satisfy a microscopic symmetry: global reversibility. Global reversibility is often satisfied in nature. However, many complex systems exhibit a lack of finite characteristic scales. In this Letter we show how to construct a generalization of the inhomogeneous Fick law that does not require the existence of characteristic scales while still satisfying global reversibility.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:23:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Calvo", "Ivan", "" ], [ "Sanchez", "Raul", "" ], [ "Carreras", "Benjamin A.", "" ], [ "van Milligen", "Boudewijn Ph.", "" ] ]
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712.1799
Alfonso Mondragon
A. Mondrag\'on, M. Mondrag\'on and E. Peinado
S_3-flavour symmetry as realized in lepton flavour violating processes
23 pages, one figure. To appear in J. Phys A: Mathematical and Theoretical (SPE QTS5)
J.Phys.A41:304035,2008
10.1088/1751-8113/41/30/304035
null
hep-ph
null
A variety of lepton flavour violating effects related to the recent discovery of neutrino oscillations and mixings is here systematically discussed in terms of an S_3-flavour permutational symmetry. After a brief review of some relevant results on lepton masses and mixings, that had been derived in the framework of a Minimal S_3-Invariant Extension of the Standard Model, we derive explicit analytical expressions for the matrices of the Yukawa couplings and compute the branching ratios of some selected flavour changing neutral current (FCNC) processes, as well as, the contribution of the exchange of neutral flavour changing scalars to the anomaly of the muon's magnetic moment as functions of the masses of the charged leptons and the neutral Higgs bosons. We find that the S_3 x Z_2 flavour symmetry and the strong mass hierarchy of the charged leptons strongly suppress the FCNC processes in the leptonic sector well below the present experimental upper bounds by many orders of magnitude. The contribution of FCNC to the anomaly of the muon's magnetic moment is small but non-negligible.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:27:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Mondragón", "A.", "" ], [ "Mondragón", "M.", "" ], [ "Peinado", "E.", "" ] ]
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712.18
Sebastien George
S\'ebastien George (LIESP), C\'ecile Bothorel (TECH/EASY)
Conception d'outils de communication sp\'ecifiques au contexte \'educatif
null
Sciences et Technologies de l'Information et de la Communication pour l'Education et la Formation 13 (2007) 317-344
null
null
cs.HC
null
In a distance learning context, providing usual communication tools (forum, chat, ...) is not always enough to create efficient interactions between learners and to favour collective knowledge building. A solution consists in setting-up collective activities which encourage learners to communicate. But, even in that case, tools can sometimes become a barrier to communication. We present in this paper examples of specific tools that are designed in order to favour and to guide communications in an educational context, but also to foster interactions during learning activities that are not inherently collaborative. We describe synchronous communication tools (semi-structured chat), asynchronous tools (temporally structured forum, contextual forum) and a system which promotes mutual aid between learners.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:30:46 GMT" } ]
2007-12-12T00:00:00
[ [ "George", "Sébastien", "", "LIESP" ], [ "Bothorel", "Cécile", "", "TECH/EASY" ] ]
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712.1801
Carlos Gonz\'alez-Fern\'andez
C. Gonz\'alez-Fern\'andez (1), A. Cabrera-Lavers (1 and 2), P.L. Hammersley (1), and F. Garz\'on (1 and 3) ((1) Instituto de Astrof\'isica de Canarias, (2) GTC Project Office, (3) Departamento de Astrof\'isica, Universidad de La Laguna)
Metallicity distribution of red giants in the Inner Galaxy from Near Infrared spectra
20 pages, 23 figures. Accepted for publication in A&A
null
10.1051/0004-6361:20077938
null
astro-ph
null
In this paper, we present low resolution (R=500) near-infrared spectra for selected and serendipitous sources in six inner in-plane Galactic fields, with the aim of analysing the stellar content present. From the equivalent widths of the main features of the K band spectra (the NaI, CaI and CO bandheads) we have derived the metallicities of the sources by means of the empirical scale obtained by Ram\'irez et al. (2000) and Frogel et al. (2001) for luminous red giants. Our results show how the mean metallicity of the sample varies with Galactic longitude. We find two groups of stars, one whose [Fe/H] is similar to the values obtained for the bulge in other studies (Molla et al. 2000; Schultehis et al 2003), and a second one with a metallicity similar to that of the inner parts of the disc (Rocha-Pinto et al. 2006). The relative density of both groups of stars in our sample varies in a continuous way from the bulge to the disc. This could hint at the existence of a single component apart from the disc and bulge, running from l=7 to l=27 and able to transport disc stars inwards and bulge stars outwards, which could be the Galactic bar that has been detected in previous works as an overdensity of stars located at those galactic coordinates (Hammersley et al. 1994, 2000; Picaud et al. 2003).
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:31:06 GMT" } ]
2009-11-13T00:00:00
[ [ "González-Fernández", "C.", "", "1 and 2" ], [ "Cabrera-Lavers", "A.", "", "1 and 2" ], [ "Hammersley", "P. L.", "", "1 and 3" ], [ "Garzón", "F.", "", "1 and 3" ] ]
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712.1802
Boris Kolev
Christian Bonatti (IMB), Boris Kolev (LATP)
Existence de points fixes enlac\'es \`a une orbite p\'eriodique d'un hom\'eomorphisme du plan
7 pages, 4 figures
Ergodic Theory and Dynamical Systems 12, 4 (1992) 677-682
null
null
math.DS
null
Let f be an orientation-preserving homeomorphism of the plane such that f-Id is contracting. Under these hypotheses, we establish the existence, for every periodic orbit, of a fixed point which has nonzero linking number with this periodic orbit.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:31:58 GMT" } ]
2007-12-12T00:00:00
[ [ "Bonatti", "Christian", "", "IMB" ], [ "Kolev", "Boris", "", "LATP" ] ]
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712.1803
Jerome Galtier
Jerome Galtier (INRIA Sophia Antipolis)
Tournament MAC with Constant Size Congestion Window for WLAN
null
null
null
null
cs.NI
null
In the context of radio distributed networks, we present a generalized approach for the Medium Access Control (MAC) with fixed congestion window. Our protocol is quite simple to analyze and can be used in a lot of different situations. We give mathematical evidence showing that our performance is tight, in the sense that no protocol with fixed congestion window can do better. We also place ourselves in the WiFi/WiMAX framework, and show experimental results enlightening collision reduction of 14% to 21% compared to the best known other methods. We show channel capacity improvement, and fairness considerations.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:43:44 GMT" }, { "version": "v2", "created": "Thu, 13 Dec 2007 09:59:55 GMT" }, { "version": "v3", "created": "Wed, 19 Dec 2007 11:54:52 GMT" } ]
2007-12-19T00:00:00
[ [ "Galtier", "Jerome", "", "INRIA Sophia Antipolis" ] ]
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712.1804
Fabrizio Zanello
Adam Van Tuyl, Fabrizio Zanello
Simplicial complexes and Macaulay's inverse systems
Very minor changes. To appear in Math. Z
Math. Z. 265 (2010), no. 1, 151-160
null
null
math.AC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $\Delta$ be a simplicial complex on $V = \{x_1,...,x_n\}$, with Stanley-Reisner ideal $I_{\Delta}\subseteq R = k[x_1,...,x_n]$. The goal of this paper is to investigate the class of artinian algebras $A=A(\Delta,a_1,...,a_n)= R/(I_{\Delta},x_1^{a_1},...,x_n^{a_n})$, where each $a_i \geq 2$. By utilizing the technique of Macaulay's inverse systems, we can explicitly describe the socle of $A$ in terms of $\Delta$. As a consequence, we determine the simplicial complexes, that we will call {\em levelable}, for which there exists a tuple $(a_1,...,a_n)$ such that $A(\Delta,a_1,...,a_n)$ is a level algebra.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:47:15 GMT" }, { "version": "v2", "created": "Sun, 22 Feb 2009 00:16:23 GMT" } ]
2011-09-06T00:00:00
[ [ "Van Tuyl", "Adam", "" ], [ "Zanello", "Fabrizio", "" ] ]
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712.1805
Christopher Search
James Owen Weatherall, Christopher P. Search, and Markku Jaaskelainen
Quantum control of EIT dispersion via atomic tunneling in a double-well Bose-Einstein condensate
null
null
10.1103/PhysRevA.78.013830
null
quant-ph
null
Electromagnetically induced transparency (EIT) is an important tool for controlling light propagation and nonlinear wave mixing in atomic gases with potential applications ranging from quantum computing to table top tests of general relativity. Here we consider EIT in an atomic Bose-Einstein Condensate (BEC) trapped in a double well potential. A weak probe laser propagates through one of the wells and interacts with atoms in a three-level $\Lambda$ configuration. The well through which the probe propagates is dressed by a strong control laser with Rabi frequency $\Omega_{\mu}$, as in standard EIT systems. Tunneling between the wells at the frequency $g$ provides a coherent coupling between identical electronic states in the two wells, which leads to the formation of inter-well dressed states. The tunneling in conjunction with the macroscopic interwell coherence of the BEC wave function, results in the formation of two ultra-narrow absorption resonances for the probe field that are inside of the ordinary EIT transparency window. We show that these new resonances can be interpreted in terms of the inter-well dressed states and the formation of a novel type of dark state involving the control laser and the inter-well tunneling. To either side of these ultra-narrow resonances there is normal dispersion with very large slope controlled by $g$. For realistic values of $g$, the large slope of this dispersion yields group velocities for the probe field that are two orders of magnitude slower than standard EIT systems. We discuss prospects for observing these ultra-narrow resonances and the corresponding regions of high dispersion experimentally.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 19:58:53 GMT" }, { "version": "v2", "created": "Sun, 11 May 2008 18:54:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Weatherall", "James Owen", "" ], [ "Search", "Christopher P.", "" ], [ "Jaaskelainen", "Markku", "" ] ]
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712.1806
Daniel Nagaj
Daniel Nagaj, Edward Farhi, Jeffrey Goldstone, Peter Shor, Igor Sylvester
The Quantum Transverse Field Ising Model on an Infinite Tree from Matrix Product States
28 pages, 23 figures, PDFlatex
Phys. Rev. B 77, 214431 (2008)
10.1103/PhysRevB.77.214431
null
cond-mat.stat-mech quant-ph
null
We give a generalization to an infinite tree geometry of Vidal's infinite time-evolving block decimation (iTEBD) algorithm for simulating an infinite line of quantum spins. We numerically investigate the quantum Ising model in a transverse field on the Bethe lattice using the Matrix Product State ansatz. We observe a second order phase transition, with certain key differences from the transverse field Ising model on an infinite spin chain. We also investigate a transverse field Ising model with a specific longitudinal field. When the transverse field is turned off, this model has a highly degenerate ground state as opposed to the pure Ising model whose ground state is only doubly degenerate.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:06:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Nagaj", "Daniel", "" ], [ "Farhi", "Edward", "" ], [ "Goldstone", "Jeffrey", "" ], [ "Shor", "Peter", "" ], [ "Sylvester", "Igor", "" ] ]
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712.1807
Paul Bracken Prof
Paul Bracken
Intrinsic Formulation of Geometric Integrability and Generation of Conservation Laws
null
Int.J.Geom.Meth.Mod.Phys.6:825-837,2009
10.1142/S0219887809003771
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An intrinsic version of the integrability theorem for the classical Backlund theorem is presented. It is characterized by a one-form which can be put in the form of a Riccati system. It is shown how this system can be linearized. Based on this, a procedure for generating an infinite number of conservation laws is given.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:07:22 GMT" }, { "version": "v2", "created": "Sat, 21 Jun 2008 00:20:36 GMT" } ]
2010-11-02T00:00:00
[ [ "Bracken", "Paul", "" ] ]
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712.1808
Andreas Luscher
Andreas Luscher, Reinhard M. Noack, Andreas Laeuchli
The FFLO state in the one-dimensional attractive Hubbard model and its fingerprint in the spatial noise correlations
8 pages, 4 figures
Phys. Rev. A 78, 013637 (2008)
10.1103/PhysRevA.78.013637
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore the pairing properties of the one-dimensional attractive Hubbard model in the presence of finite spin polarization. The correlation exponents for the most important fluctuations are determined as a function of the density and the polarization. We find that in a system with spin population imbalance, Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-type pairing at wavevector Q=|k_{F,\uparrow}-k_{F,\downarrow}| is always dominant and there is no Chandrasekhar-Clogston limit. We then investigate the case of weakly coupled 1D systems and determine the region of stability of the 1D FFLO phase. This picture is corroborated by density-matrix-renormalization-group (DMRG) simulations of the spatial noise correlations in uniform and trapped systems, unambiguously revealing the presence of fermion pairs with nonzero momentum Q. This opens up an interesting possibility for experimental studies of FFLO states.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:25:03 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 21:41:23 GMT" }, { "version": "v3", "created": "Wed, 18 Jun 2008 11:48:57 GMT" }, { "version": "v4", "created": "Wed, 6 Aug 2008 12:43:05 GMT" } ]
2008-08-06T00:00:00
[ [ "Luscher", "Andreas", "" ], [ "Noack", "Reinhard M.", "" ], [ "Laeuchli", "Andreas", "" ] ]
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712.1809
James McLaughlin
J. A. McLaughlin, A. W. Hood
MHD Wave Propagation in the Neighbourhood of Two Null Points
11 pages, 14 figures
Astron.Astrophys.435:313-325,2005
10.1051/0004-6361:20042361
null
astro-ph
null
The nature of fast magnetoacoustic and Alfv\'en waves is investigated in a zero $\beta$ plasma in the neighbourhood of a pair of two-dimensional null points. This gives an indication of wave propagation in the low $\beta$ solar corona, for a more complicated magnetic configuration than that looked at by McLaughlin & Hood (2004). It is found that the fast wave is attracted to the null points and that the front of the wave slows down as it approaches the null point pair, with the wave splitting and part of the wave accumulating at one null and the rest at the other. Current density will then accumulate at these points and ohmic dissipation will then extract the energy in the wave at these points. This suggests locations where wave heating will occur in the corona. The Alfv\'en wave behaves in a different manner in that the wave accumulates along the separatrices. Hence, the current density will accumulate at this part of the topology and this is where wave heating will occur. However, the phenomenon of wave accumulation at a specific place is a feature of both wave types, and illustrates the importance of studying the topology of the corona when considering MHD wave propagation.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:26:07 GMT" } ]
2009-06-25T00:00:00
[ [ "McLaughlin", "J. A.", "" ], [ "Hood", "A. W.", "" ] ]
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712.181
Mark G. Alford
Mark G. Alford and Gerald Good
Flux tubes and the type-I/type-II transition in a superconductor coupled to a superfluid
14 pages, improved discussion of the effects of varying the neutron/proton condensate ratio; added references
Phys.Rev.B78:024510,2008
10.1103/PhysRevB.78.024510
null
nucl-th cond-mat.supr-con
null
We analyze magnetic flux tubes at zero temperature in a superconductor that is coupled to a superfluid via both density and gradient (``entrainment'') interactions. The example we have in mind is high-density nuclear matter, which is a proton superconductor and a neutron superfluid, but our treatment is general and simple, modeling the interactions as a Ginzburg-Landau effective theory with four-fermion couplings, including only s-wave pairing. We numerically solve the field equations for flux tubes with an arbitrary number of flux quanta, and compare their energies. This allows us to map the type-I/type-II transition in the superconductor, which occurs at the conventional kappa = 1/sqrt(2) if the condensates are uncoupled. We find that a density coupling between the condensates raises the critical kappa and, for a sufficiently high neutron density, resolves the type-I/type-II transition line into an infinite number of bands corresponding to ``type-II(n)'' phases, in which n, the number of quanta in the favored flux tube, steps from 1 to infinity. For lower neutron density, the coupling creates spinodal regions around the type-I/type-II boundary, in which metastable flux configurations are possible. We find that a gradient coupling between the condensates lowers the critical kappa and creates spinodal regions. These exotic phenomena may not occur in nuclear matter, which is thought to be deep in the type-II region, but might be observed in condensed matter systems.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:18:40 GMT" }, { "version": "v2", "created": "Tue, 3 Jun 2008 20:42:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Alford", "Mark G.", "" ], [ "Good", "Gerald", "" ] ]
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712.1811
Richard F. Lebed
Herry J. Kwee, Richard F. Lebed
Pion Form Factor in Improved Holographic QCD Backgrounds
19 pages, 1 eps figure. This version, to appear in Phys. Rev. D, includes an extended discussion of the fit to the soft-wall model and a detailed description of the numerical approaches used
Phys.Rev.D77:115007,2008
10.1103/PhysRevD.77.115007
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We extend a recent numerical calculation of the pion electromagnetic form factor F_\pi (Q^2) in holographic QCD to study two important issues regarding the behavior of fields in the bulk. First, we show that using a chiral symmetry-breaking field formally satisfying the boundary conditions of the ``soft-wall'' model changes numerical results very little from the earlier calculation that ignores these constraints. Second, we use a background field that interpolates between ``hard-wall'' and ``soft-wall'' models to obtain an improved model that reproduces the desirable phenomenological features of both. In all cases, F_\pi$ for large Q^2 is shallower than data, an effect that can be cured by relaxing the fit to one of the static observables, particularly the decay constant f_\pi.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:22:19 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 16:50:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Kwee", "Herry J.", "" ], [ "Lebed", "Richard F.", "" ] ]
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712.1812
Valentin V. Khoze
Steven A. Abel, Callum Durnford, Joerg Jaeckel and Valentin V. Khoze
Patterns of Gauge Mediation in Metastable SUSY Breaking
Minor corrections. Extended version published in JHEP. New appendix on R-symmetry. 28 pages, 3 Figures
JHEP0802:074,2008
10.1088/1126-6708/2008/02/074
IPPP/07/97
hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Supersymmetry breaking in a metastable vacuum allows one to build simple and concrete models of gauge mediation. Generation of gaugino masses requires that R-symmetry be broken in this vacuum. In general, there are two possible ways to break R-symmetry, explicitly or spontaneously. We find that the MSSM phenomenology depends crucially on how this breaking occurs in the Hidden Sector. Explicit R-symmetry breaking models can lead to fairly standard gauge mediation, but we argue that in the context of ISS-type models this only makes sense if B=0 at the mediation scale, which leads to high tan(beta). If on the other hand, R-symmetry is broken spontaneously, then R-symmetry violating soft terms tend to be suppressed with respect to R-symmetry preserving ones, and one is led to a scenario with large scalar masses. These models interpolate between standard gauge mediation and split SUSY models. We provide benchmark points for the two scenarios. They demonstrate that the specific dynamics of the Hidden Sector -- the underlying nature of supersymmetry and R-symmetry breaking -- affects considerably the mass spectrum of the MSSM, and vice versa.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:37:13 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 11:49:46 GMT" }, { "version": "v3", "created": "Tue, 19 Feb 2008 09:27:31 GMT" }, { "version": "v4", "created": "Mon, 9 Feb 2009 12:29:07 GMT" } ]
2009-02-09T00:00:00
[ [ "Abel", "Steven A.", "" ], [ "Durnford", "Callum", "" ], [ "Jaeckel", "Joerg", "" ], [ "Khoze", "Valentin V.", "" ] ]
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712.1813
Jonathan Le\'on-Tavares
J. Leon-Tavares, A.P. Lobanov, V.H. Chavushyan and T.G. Arshakian
Radio-Optical Study of Double-Peaked AGNs. I. 3C 390.3
3 pages, 3 figures. From planets to dark energy: the modern radio universe October 1-5 2007 University of Manchester, Manchester, UK
PoS MRU:112,2007
null
null
astro-ph
null
We aim to test the model proposed to explain the correlation between the flux density at 15 GHz of a stationary component in the parsec-scale jet and the optical continuum emission in the radio galaxy 3C~390.3. In the model, the double-peaked emission from 3C~390.3 is likely to be generated both near the disk and in a rotating subrelativistic outflow surrounding the jet, due to ionization of the outflow by the beamed continuum emission from the jet. This scenario is chosen since broad-emission lines are observed to vary following changes in the inner radio jet. For recent epochs we have imaged and modelled the radio emission of the inner jet of 3C~390.3, which was observed with very long baseline interferometry at 15 GHz, 22 GHz and 43 GHz, to image the inner part of the parsec-scale jet, locate the exact region where the bulk of the continuum luminosity is generated and search for the mechanism that drives the double-peaked profile emission. We present the preliminary results of testing the model using data from 11 years of active monitoring of 3C~390.3.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:38:35 GMT" } ]
2009-06-23T00:00:00
[ [ "Leon-Tavares", "J.", "" ], [ "Lobanov", "A. P.", "" ], [ "Chavushyan", "V. H.", "" ], [ "Arshakian", "T. G.", "" ] ]
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712.1814
Rafel Escribano
Rafel Escribano (UAB and IFAE, Barcelona)
Is eta' partially made of gluonium?
8 pages, 2 figures, uses frascatiphys style. Talk presented at the XII International Conference on Hadron Spectroscopy (HADRON 07), Laboratori Nazionali di Frascati (Rome), Italy, 8-13 October 2007
null
null
UAB-FT-635
hep-ph hep-ex
null
A phenomenological analysis of radiative $V\to P\gamma$ and $P\to V\gamma$ decays is performed in order to determine the gluonic content of the $\eta^\prime$ wave function. Our result shows that there is no evidence for such a gluonium contribution, $Z_{\eta^\prime}^2=0.04\pm 0.09$. In terms of a mixing angle description this corresponds to $\phi_P=(41.4\pm 1.3)^\circ$ and $|\phi_{\eta^\prime G}|=(12\pm 13)^\circ$.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:43:21 GMT" } ]
2007-12-13T00:00:00
[ [ "Escribano", "Rafel", "", "UAB and IFAE, Barcelona" ] ]
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712.1815
Per Berglund
Vijay Balasubramanian, Per Berglund, Raul Jimenez, Joan Simon, Licia Verde
Topology from Cosmology
34 pages, added references, improved argument of observable dependence on microscopic parameters
JHEP0806:025,2008
10.1088/1126-6708/2008/06/025
null
hep-th astro-ph
null
We show that cosmological observables can constrain the topology of the compact additional dimensions predicted by string theory. To do this, we develop a general strategy for relating cosmological observables to the microscopic parameters of the potentials and field-dependent kinetic terms of the multiple scalar fields that arise in the low-energy limit of string theory. We apply this formalism to the Large Volume Scenarios in Type IIB flux compactifications where analytical calculations are possible. Our methods generalize to other settings.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 20:47:03 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 20:54:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Balasubramanian", "Vijay", "" ], [ "Berglund", "Per", "" ], [ "Jimenez", "Raul", "" ], [ "Simon", "Joan", "" ], [ "Verde", "Licia", "" ] ]
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712.1816
Gianfranco Gentile
G. Gentile, H. S. Zhao, B. Famaey
Neutrinos as galactic dark matter in the Ursa Major galaxy group?
Accepted for publication in MNRAS Letters. 5 pages, 2 figures
null
10.1111/j.1745-3933.2008.00435.x
null
astro-ph
null
We present the analysis of 23 published rotation curves of disk galaxies belonging to the Ursa Major group of galaxies, with kinematics free of irregularities. The rotation curves are analysed in the context of MOND (Modified Newtonian Dynamics). We add an extra component to the rotation curve fits, in addition to the stellar and gaseous disks: a speculative halo of constant density made of, e.g., neutrinos, which would solve the bulk of the problem currently faced by MOND on rich galaxy clusters scales. We find that this additional unseen mass density is poorly constrained (as expected a priori, given that a neutrino halo never dominates the kinematics), but we also find that the best-fit value is non-zero: rho = 3.8 x 10^{-27} g/cm^3, and that a zero-density is marginally excluded with 87% confidence; also, the 95% confidence upper limit for the density is rho = 9.6 x 10^{-27} g/cm^3. These limits are slightly above the expectations from the Tremaine-Gunn phase space constraints on ordinary 2 eV neutrinos, but in accordance with the maximum density expected for one or two species of 5 eV sterile neutrinos.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:04:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Gentile", "G.", "" ], [ "Zhao", "H. S.", "" ], [ "Famaey", "B.", "" ] ]
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712.1817
Darrick E. Chang
D.E. Chang, V. Gritsev, G. Morigi, V. Vuletic, M.D. Lukin, and E.A. Demler
Crystallization of strongly interacting photons in a nonlinear optical fiber
null
Nature Phys. 4, 884-889 (2008)
10.1038/nphys1074
null
cond-mat.other
null
Understanding strongly correlated quantum systems is a central problem in many areas of physics. The collective behavior of interacting particles gives rise to diverse fundamental phenomena such as confinement in quantum chromodynamics, phase transitions, and electron fractionalization in the quantum Hall regime. While such systems typically involve massive particles, optical photons can also interact with each other in a nonlinear medium. In practice, however, such interactions are often very weak. Here we describe a novel technique that allows the creation of a strongly correlated quantum gas of photons using one-dimensional optical systems with tight field confinement and coherent photon trapping techniques. The confinement enables the generation of large, tunable optical nonlinearities via the interaction of photons with a nearby cold atomic gas. In its extreme, we show that a quantum light field can undergo fermionization in such one-dimensional media, which can be probed via standard photon correlation measurements.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:00:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Chang", "D. E.", "" ], [ "Gritsev", "V.", "" ], [ "Morigi", "G.", "" ], [ "Vuletic", "V.", "" ], [ "Lukin", "M. D.", "" ], [ "Demler", "E. A.", "" ] ]
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712.1818
Mark Norris
Mark A. Norris, Ray M. Sharples, Terry Bridges, Karl Gebhardt, Duncan A. Forbes, Robert Proctor, Favio Raul Faifer, Juan Carlos Forte, Michael A. Beasley, Stephen E. Zepf, David A. Hanes
Gemini/GMOS Spectroscopy of the Spheroid and Globular Cluster System of NGC 3923
15 pages, 9 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12826.x
null
astro-ph
null
We present a technique to extract ultra-deep diffuse-light spectra from the standard multi-object spectroscopic observations used to investigate extragalactic globular cluster (GC) systems. This technique allows a clean extraction of the spectrum of the host galaxy diffuse light from the same slitlets as the GC targets. We show the utility of the method for investigating the kinematics and stellar populations of galaxies at radii much greater than usually probed in longslit studies, at no additional expense in terms of telescope time. To demonstrate this technique we present Gemini/GMOS spectroscopy of 29 GCs associated with the elliptical galaxy NGC 3923. We compare the measured stellar population parameters of the GC system with those of the spheroid of NGC 3923 at the same projected radii, and find the GCs to have old ages (> 10 Gyr), [alpha/Fe]~0.3 and a range of metallicities running from [Z/H] = -1.8 to +0.35. The diffuse light of the galaxy is found to have ages, metallicities and [alpha/Fe] abundance ratios indistinguishable from those of the red GCs.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 14:29:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Norris", "Mark A.", "" ], [ "Sharples", "Ray M.", "" ], [ "Bridges", "Terry", "" ], [ "Gebhardt", "Karl", "" ], [ "Forbes", "Duncan A.", "" ], [ "Proctor", "Robert", "" ], [ "Faifer", "Favio Raul", "" ], [ "Forte", "Juan Carlos", "" ], [ "Beasley", "Michael A.", "" ], [ "Zepf", "Stephen E.", "" ], [ "Hanes", "David A.", "" ] ]
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712.1819
Casey Papovich
Casey Papovich (Steward Observatory, University of Arizona)
The Angular Clustering of Distant Galaxy Clusters
Accepted for publication in ApJ. 12 pages in emulateapj format, 10 figures (some in color). Comments welcome
null
10.1086/527665
null
astro-ph
null
We discuss the angular clustering of galaxy clusters at z > 1 selected within 50 sq. deg from the Spitzer Wide-Infrared Extragalactic survey. We employ a simple color selection to identify high redshift galaxies with no dependence on galaxy rest-frame optical color using Spitzer IRAC 3.6 and 4.5 micron photometry. The majority (>90%) of galaxies with z > 1.3 are identified with [3.6] - [4.5] > -0.1 AB mag. We identify candidate galaxy clusters at z > 1 by selecting overdensities of >26-28 objects with [3.6] - [4.5] > -0.1 mag within radii of 1.4 arcminutes, which corresponds to r < 0.5 Mpc/h at z=1.5. These candidate galaxy clusters show strong angular clustering, with an angular correlation function represented by w(theta) = (3.1 +/- 0.5) theta^(-1.1 +/- 0.1) with theta in units of arcminutes over scales of 2-100 arcminutes. Assuming the redshift distribution of these galaxy clusters follows a fiducial model, these galaxy clusters have a spatial-clustering scale length r_0 = 22.4 +/- 3.6 Mpc/h, and a comoving number density n = 1.2 +/- 0.1 x 10^-6 (Mpc/h)^-3. The correlation scale length and number density of these objects are comparable to those of rich galaxy clusters at low redshift. The number density of these high-redshift clusters correspond to dark-matter halos larger than 3-5 x 10^13 h^-1 solar masses at z=1.5. Assuming the dark halos hosting these high-redshift clusters grow following Lambda-CDM models, these clusters will reside in halos larger than 1-2 x 10^14 h^-1 solar masses at z=0.2, comparable to rich galaxy clusters.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 18:39:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Papovich", "Casey", "", "Steward Observatory, University of Arizona" ] ]
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712.182
Scott Watson
Nemanja Kaloper and Scott Watson
Geometric Precipices in String Cosmology
27 pages, 6 figures, References added, accepted in PRD
Phys.Rev.D77:066002,2008
10.1103/PhysRevD.77.066002
null
hep-th astro-ph gr-qc hep-ph
null
We consider the effects of graviton multiplet fields on transitions between string gas phases. Focusing on the dilaton field, we show that it may obstruct transitions between different thermodynamic phases of the string gas, because the sign of its dimensionally reduced, $T$-duality invariant, part is conserved when the energy density of the universe is positive. Thus, many interesting solutions for which this sign is positive end up in a future curvature singularity. Because of this, some of the thermodynamic phases of the usual gravitating string gases behave like superselection sectors. For example, a past-regular Hagedorn phase and an expanding FRW phase dominated by string momentum modes cannot be smoothly connected in the framework of string cosmology with positive sources. The singularity separates them like a geometric precipice in the moduli space, preventing the dynamics of the theory from bridging across. Sources which simultaneously violate the positivity of energy and NEC could modify these conclusions. We provide a quantitative measure of positivity of energy and NEC violations that would be necessary for such transitions. These effects must dominate the universe at the moment of transition, altering the standard gas pictures. At present, it is not known how to construct such sources from first principles in string theory.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 03:53:52 GMT" }, { "version": "v2", "created": "Sat, 2 Feb 2008 15:26:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Kaloper", "Nemanja", "" ], [ "Watson", "Scott", "" ] ]
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712.1821
Steffen Mieske
Steffen Mieske, Pavel Kroupa
An extreme IMF as an explanation for high M/L ratios in UCDs? The CO index as a tracer of bottom heavy IMFs
7 pages, 5 figures, accepted for publication in ApJ
null
10.1086/528739
null
astro-ph
null
A new type of compact stellar systems, labelled ``ultra-compact dwarf galaxies'' (UCDs), was discovered in the last decade. Recent studies show that their dynamical mass-to-light ratios (M/L) tend to be too high to be explained by canonical stellar populations, being on average about twice as large as those of Galactic globular clusters of comparable metallicity. If this offset is caused by dark matter in UCDs, it would imply dark matter densities as expected for the centers of cuspy dark matter halos, incompatible with cored dark matter profiles. Investigating the nature of the high M/L ratios in UCDs therefore offers important constraints on the phase space properties of dark matter particles. Here we describe an observational method to test whether a bottom-heavy IMF may cause the high M/L ratios of UCDs. We propose to use the CO index at 2.3mu -- which is sensitive to the presence of low-mass stars -- to test for a bottom heavy IMF. In the case that the high M/L ratios are caused by a bottom-heavy IMF, we show that the equivalent width of the CO index will be up to 30% weaker in UCDs compared to sources with similar metallicity that have canonical IMFs. We find that these effects are well detectable with current astronomical facilities in a reasonable amount of time (a few hours to nights). Measuring the CO index of UCDs hence appears a promising tool to investigate the origin of their high M/L ratios.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:07:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Mieske", "Steffen", "" ], [ "Kroupa", "Pavel", "" ] ]
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712.1822
Wissam Al-Saidi
W. A. Al-Saidi, E. J. Walter, and A. M. Rappe
Optimized norm-conserving Hartree-Fock pseudopotentials for plane-wave calculations
To be published in Phys. Rev. B
Phys. Rev. B 77, 075112 (2008)
10.1103/PhysRevB.77.075112
null
cond-mat.mtrl-sci
null
We report Hartree-Fock (HF) based pseudopotentials suitable for plane-wave calculations. Unlike typical effective core potentials, the present pseudopotentials are finite at the origin and exhibit rapid convergence in a plane-wave basis; the optimized pseudopotential method [A. M. Rappe et. al, Phys. Rev. B 41 1227--30 (1990)] improves plane-wave convergence. Norm-conserving HF pseudopotentials are found to develop long-range non-Coulombic behavior which does not decay faster than 1/r, and is non-local. This behavior, which stems from the nonlocality of the exchange potential, is remedied using a recently developed self-consistent procedure [J. R. Trail and R. J. Needs, J. Chem. Phys. 122, 014112 (2005)]. The resulting pseudopotentials slightly violate the norm conservation of the core charge. We calculated several atomic properties using these pseudopotentials, and the results are in good agreement with all-electron HF values. The dissociation energies, equilibrium bond lengths, and frequency of vibrations of several dimers obtained with these HF pseudopotentials and plane waves are also in good agreement with all-electron results.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:01:53 GMT" } ]
2008-02-28T00:00:00
[ [ "Al-Saidi", "W. A.", "" ], [ "Walter", "E. J.", "" ], [ "Rappe", "A. M.", "" ] ]
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712.1823
Maria Jose Calderon
M.J. Calderon, Belita Koiller, and S. Das Sarma
Valley interference effects on a donor electron close to a Si/SiO2 interface
7 pages, 5 figures
Phys. Rev. B 77, 155302 (2008)
10.1103/PhysRevB.77.155302
null
cond-mat.mes-hall quant-ph
null
We analyze the effects of valley interference on the quantum control and manipulation of an electron bound to a donor close to a Si/SiO2 interface as a function of the valley-orbit coupling at the interface. We find that, for finite valley-orbit coupling, the tunneling times involved in shuttling the electron between the donor and the interface oscillate with the interface/donor distance in much the same way as the exchange coupling oscillates with the interdonor distance. These oscillations disappear when the ground state at the interface is degenerate (corresponding to zero valley-orbit coupling).
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:12:47 GMT" } ]
2008-04-18T00:00:00
[ [ "Calderon", "M. J.", "" ], [ "Koiller", "Belita", "" ], [ "Sarma", "S. Das", "" ] ]
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712.1824
Brent Groves
B. Groves (1), M. Dopita (2), R. Sutherland (2), L. Kewley (3), J. Fischera (4), C. Leitherer (5), B.Brandl (1) and W. van Breugal (6) ((1) University Leiden, (2)RSAA, ANU, (3)IoA, Univ. of Hawai'i, (4)CITA, Univ. of Toronto, (5)STScI, (6)U. Cal. at Merced)
Modelling the Pan-Spectral Energy Distribution of Starburst Galaxies: IV The Controlling Parameters of the Starburst SED
35 pages, 21 figures, accepted for publication in ApJS full-res available at http://www.strw.leidenuniv.nl/~brent/publications/SEDIV.pdf
null
10.1086/528711
null
astro-ph
null
We combine the the stellar spectral synthesis code Starburst99, the nebular modelling code MAPPINGSIII, and a 1-D dynamical evolution model of HII regions around massive clusters of young stars to generate improved models of the spectral energy distribution (SED) of starburst galaxies. We introduce a compactness parameter, C, which characterizes the specific intensity of the radiation field at ionization fronts in HII regions, and which controls the shape of the far-IR dust re-emission, often referred to loosely as the dust ``temperature''. We also investigate the effect of metallicity on the overall SED and in particular, on the strength of the PAH features. We provide templates for the mean emission produced by the young compact HII regions, the older (10 - 100 Myr) stars and for the wavelength-dependent attenuation produced by a foreground screen of the dust used in our model. We demonstrate that these components may be combined to produce a excellent fit to the observed SEDs of star formation dominated galaxies which are often used as templates (Arp 220 and NGC 6240). This fit extends from the Lyman Limit to wavelengths of about one mm. The methods presented in both this paper and in the previous papers of this series allow the extraction of the physical parameters of the starburst region (star formation rates, star formation rate history, mean cluster mass, metallicity, dust attenuation and pressure) from the analysis of the pan-spectral SED.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:03:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Groves", "B.", "" ], [ "Dopita", "M.", "" ], [ "Sutherland", "R.", "" ], [ "Kewley", "L.", "" ], [ "Fischera", "J.", "" ], [ "Leitherer", "C.", "" ], [ "Brandl", "B.", "" ], [ "van Breugal", "W.", "" ] ]
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712.1825
Mercedes Lopez-Morales
Alceste Z. Bonanos, Mercedes Lopez-Morales (Carnegie-DTM), Ian Hunter, Robert S.I. Ryans (Queen's University Belfast)
Low Metallicity Indicates that the Hypervelocity Star HE 0437-5439 was Ejected from the LMC
12 pages, 3 figures, 1 table; accepted to ApJL. Added 2 coauthors & full abundance analysis. Results are strengthened
Astrophys.J. 675 (2008) L77-L80
10.1086/533531
null
astro-ph
null
We measure the metallicity of the unusual hypervelocity star HE 0437-5439 from high resolution spectroscopy to be half-solar. We determine a spectral type of B2 IV-III for the star and derive an effective temperature Teff= 21,500 +/- 1,000 K and a surface gravity log(g) = 3.7 +/- 0.2 (cgs). We also present BV time series photometry and find the star to be non-variable at the 0.02 mag level. We refine the magnitude of the hypervelocity star to V=16.36+/-0.04 mag, with a color B-V=-0.23+/-0.03 mag, confirming its early-type nature. Our metallicity result establishes the origin of HE 0437-5439 in the Large Magellanic Cloud and implies the existence of a massive black hole somewhere in this galaxy.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 23:07:21 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 18:23:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Bonanos", "Alceste Z.", "", "Carnegie-DTM" ], [ "Lopez-Morales", "Mercedes", "", "Carnegie-DTM" ], [ "Hunter", "Ian", "", "Queen's University Belfast" ], [ "Ryans", "Robert S. I.", "", "Queen's University Belfast" ] ]
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712.1826
Igor Bandos
Igor A. Bandos
On covariant quantization of M0-brane. Spinor moving frame, pure spinor formalism and hidden symmetries of D=11 supergravity
10 pages, no figures, talk given at SQS07, Supersymmetry and Quantum Symmetries, JINR, Dubna, July 30-August 4, 2007. V2: reference on 1985 preprint by M.J. Duff [28] and notice on it added
null
null
FTUV-07-1112, IFIC-07-78
hep-th
null
The covariant quantization of massless D=11 superparticle (M0-brane) in its twistor-like Lorentz harmonic formulation is used to clarify the origin and some properties of the Berkovits pure spinor approach to quantum superstring and to search for hidden symmetries of D=11 supergravity. In the twistor like Lorentz harmonic formulation, the SO(16) symmetry is seen already at the classical level. The quantization produces the linearized supergravity multiplet as 128+128=256 component Majorana spinor of SO(16) and also shows an indirect argument in favor of the possible E8 symmetry.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 14:28:41 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 17:22:26 GMT" } ]
2008-02-20T00:00:00
[ [ "Bandos", "Igor A.", "" ] ]
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712.1827
Benjamin Oppenheimer
Benjamin D. Oppenheimer, Romeel Dav\'e
Mass, Metal, and Energy Feedback in Cosmological Simulations
Accepted to MNRAS. 28 MNRAS pages, 14 figures. Text modified slightly with the largest changes/additions to Section 5.4
null
10.1111/j.1365-2966.2008.13280.x
null
astro-ph
null
Using Gadget-2 cosmological hydrodynamic simulations including an observationally-constrained model for galactic outflows, we investigate how feedback from star formation distributes mass, metals, and energy on cosmic scales from z=6->0. We include instantaneous enrichment from Type II SNe, delayed enrichment from Type Ia SNe and stellar (AGB) mass loss, and we individually track C, O, Si, and Fe. Following on the successes of the momentum-driven wind scalings, we improve our implementation with an on-the-fly galaxy finder to derive wind properties based on host galaxy masses. By tracking wind particles in a suite of simulations, we find: (1) Wind material reaccretes onto a galaxy on a recycling timescale that varies inversely with galaxy mass. Hence metals driven into the IGM by galactic superwinds cannot be assumed to leave their galaxy forever. Wind material is typically recycled several times; the median number of ejections for a given wind particle is 3, so by z=0 the total mass ejected in winds exceeds 0.5\Omega_b. (2) The physical distance winds travel is fairly independent of redshift and galaxy mass (60-100 physical kpc). For sizable galaxies at later epochs, winds typically do not escape the galaxy halo, and rain back down in a halo fountain. High-z galaxies enrich a significantly larger comoving volume of the IGM, with metals migrating back into galaxies to lower z. (3) The energy imparted into winds scales with M_{gal}^{1/3}, and energy from another source besides SNe (such as photons from young stars) may be required to distributed cosmic metals as observed. (4) The production of all 4 metals tracked is globally dominated by Type II SNe at all epochs. However, intracluster gas iron content triples as a result of non-Type II sources, and the low-z IGM carbon content is boosted by AGB feedback.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:52:38 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 18:39:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Oppenheimer", "Benjamin D.", "" ], [ "Davé", "Romeel", "" ] ]
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712.1828
Gil Refael
Gil Refael, Eugene Demler
Superfluid-insulator transition in Fermi-Bose mixtures and the orthogonality catastrophe
11 pages, 4 figures
null
10.1103/PhysRevB.77.144511
null
cond-mat.supr-con
null
The superfluid-insulator transition of bosons is strongly modified by the presence of Fermions. Through an imaginary-time path integral approach, we derive the self-consistent mean-field transition line, and account for both the static and the dynamic screening effects of the fermions. We find that an effect akin to the fermionic orthogonality catastrophe, arising from the fermionic screening fluctuations, suppresses superfluidity. We analyze this effect for various mixture parameters and temperatures, and consider possible signatures of the orthogonality catastrophe effect in other measurables of the mixture.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 06:50:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Refael", "Gil", "" ], [ "Demler", "Eugene", "" ] ]
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712.1829
Max Pettini
Max Pettini (Institute of Astronomy, University of Cambridge), Berkeley J. Zych (Institute of Astronomy, University of Cambridge), Charles C. Steidel (California Institute of Technology), Fred H. Chaffee (W. M. Keck Observatory)
C, N, O Abundances in the Most Metal-Poor Damped Lyman alpha Systems
17 pages, 9 Figures, Accepted for publication in Monthly Notices of the Royal Astronomical Society
null
10.1111/j.1365-2966.2008.12951.x
null
astro-ph
null
This study focuses on some of the most metal-poor damped Lyman alpha absorbers known in the spectra of high redshift QSOs, using new and archival observations obtained with UV-sensitive echelle spectrographs on the Keck and VLT telescopes. The weakness and simple velocity structure of the absorption lines in these systems allows us to measure the abundances of several elements, and in particular those of C, N, and O, a group that is difficult to study in DLAs of more typical metallicities. We find that when the oxygen abundance is less than about 1/100 of solar, the C/O ratio in high redshift DLAs and sub-DLAs matches that of halo stars of similar metallicity and shows higher values than expected from galactic chemical evolution models based on conventional stellar yields. Furthermore, there are indications that at these low metallicities the N/O ratio may also be above simple expectations and may exhibit a minimum value, as proposed by Centurion and her collaborators in 2003. Both results can be interpreted as evidence for enhanced production of C and N by massive stars in the first few episodes of star formation, in our Galaxy and in the distant proto-galaxies seen as QSO absorbers. The higher stellar yields implied may have an origin in stellar rotation which promotes mixing in the stars' interiors, as considered in some recent model calculations. We briefly discuss the relevance of these results to current ideas on the origin of metals in the intergalactic medium and the universality of the stellar initial mass function.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:25:57 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 10:21:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Pettini", "Max", "", "Institute of Astronomy, University of Cambridge" ], [ "Zych", "Berkeley J.", "", "Institute of Astronomy, University of Cambridge" ], [ "Steidel", "Charles C.", "", "California Institute of Technology" ], [ "Chaffee", "Fred H.", "", "W. M. Keck\n Observatory" ] ]
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712.183
Alessandro Cuoco
Alessandro Cuoco, Steen Hannestad
Ultra-high energy Neutrinos from Centaurus A and the Auger hot spot
5 pages, 2 figures, 1 table; enlarged discussion; matches published version
Phys.Rev.D78:023007,2008
10.1103/PhysRevD.78.023007
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Pierre Auger collaboration has reported a correlation between Ultra-High Energy Cosmic Rays (UHECR) and nearby Active Galactic Nuclei (AGNs) within 75 Mpc. Two of these events fall within 3 degrees from Centaurus A, the nearest AGN, clearly suggesting that this object is a strong UHECR emitter. Here we pursue this hypothesis and forecast the expected rate of ultra-high energy neutrinos in detectors like IceCube. In our baseline model we find a rate of 0.4--0.6 yr^-1 events above a threshold of 100 TeV, the uncertainty of which is mainly related to the poor knowledge of the physical parameters of the source and on the details of the model. This situation will improve with detailed high energy gamma ray measurements of Cen A by the upcoming GLAST satellite. This would make Cen A the first example where the potential of high energy multi-messenger astronomy is finally realized.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:43:08 GMT" }, { "version": "v2", "created": "Fri, 25 Jul 2008 12:23:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Cuoco", "Alessandro", "" ], [ "Hannestad", "Steen", "" ] ]
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712.1831
Rob Gibson
Robert R. Gibson, W. N. Brandt, Donald P. Schneider, S. C. Gallagher
Quasar Broad Absorption Line Variability on Multi-Year Time Scales
To be published in ApJ
null
10.1086/527462
null
astro-ph
null
We use quantitative metrics to characterize the variation of CIV 1549 A broad absorption lines (BALs) over 3--6 (rest-frame) years in a sample of 13 quasars at 1.7 <= z <= 2.8 and compare the results to previous studies of BAL variability on shorter time scales. The strong BALs in our study change in complex ways over 3--6 yr. Variation occurs in discrete regions which are only a few thousand km/s wide, and the distribution of the change in absorption equivalent width broadens over time. We constrain the typical CIV BAL lifetime to be at least a few decades. While we do not find evidence to support a scenario in which the variation is primarily driven by photoionization on multi-year time scales, there is some indication that the variation is produced by changes in outflow geometry. We do not observe significant changes in the BAL onset velocity, indicating that the absorber is either far from the source or is being continually replenished and is azimuthally symmetric. It is not possible in a human lifetime to expand the time scales in our study by more than a factor of a few using optical spectroscopy. However, the strong variation we have observed in some BALs indicates that future studies of large numbers of BAL QSOs will be valuable to constrain BAL lifetimes and the physics of variation.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:22:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Gibson", "Robert R.", "" ], [ "Brandt", "W. N.", "" ], [ "Schneider", "Donald P.", "" ], [ "Gallagher", "S. C.", "" ] ]
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712.1832
Mariana Orellana
G.E. Romero, M. Orellana, A.T. Okazaki and S.P. Owocki
LS I+61 303: microquasar or not microquasar?
4 figs, 4 pages, contributing paper to the Conference "High Energy Processes in Relativistic Outflows", Dublin, September, 2007
Int.J.Mod.Phys.D17:1875-1881,2008
10.1142/S0218271808013510
null
astro-ph
null
LS I +61 303 is a puzzling object detected from radio up to high-energy gamma-rays. Variability has recently been observed in its high-energy emission. The object is a binary system, with a compact object and a Be star as primary. The nature of the secondary and the origin of the gamma-ray emission are not clearly established at present. Recent VLBA radio data have been used to claim that the system is a Be/neutron star colliding wind binary, instead of a microquasar. We review the main views on the nature of LS I +61 303 and present results of 3D SPH simulations that can shed some light on the nature of the system. Our results support an accretion powered source, compatible with a microquasar interpretation.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:29:04 GMT" } ]
2009-06-23T00:00:00
[ [ "Romero", "G. E.", "" ], [ "Orellana", "M.", "" ], [ "Okazaki", "A. T.", "" ], [ "Owocki", "S. P.", "" ] ]
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712.1833
Naoko Kurahashi
Naoko Kurahashi and Giorgio Gratta
Oceanic Ambient Noise as a Background to Acoustic Neutrino Detection
Minor changes. Submitted to PRD. 5 pages, 7 figures
Phys.Rev.D78:092001,2008
10.1103/PhysRevD.78.092001
null
physics.ao-ph astro-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ambient noise measured in the deep ocean is studied in the context of a search for signals from ultra-high energy cosmic ray neutrinos. The spectral shape of the noise at the relevant high frequencies is found to be very stable for an extensive data set collected over several months from 49 hydrophones mounted near the bottom of the ocean at ~1600 m depth. The slopes of the ambient noise spectra above 15 kHz are found to roll-off faster than the -6 dB/octave seen in Knudsen spectra. A model attributing the source to an uniform distribution of surface noise that includes frequency-dependent absorption at large depth is found to fit the data well up to 25 kHz. This depth dependent model should therefore be used in analysis methods of acoustic neutrino pulse detection that require the expected noise spectra.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:39:54 GMT" }, { "version": "v2", "created": "Thu, 16 Oct 2008 19:48:37 GMT" } ]
2010-11-23T00:00:00
[ [ "Kurahashi", "Naoko", "" ], [ "Gratta", "Giorgio", "" ] ]
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712.1834
Carlos Kenig
Carlos E.Kenig and Frank Merle
Scattering for H^1/2 bounded solutions to the cubic, defocusing NLS in 3 dimensions
To appear, Tran.Amer.Math.Soc
null
null
null
math.AP math.AG
null
We show that if a solution of the defocusing cubic NLS in 3d remains bounded in the homogeneous Sobolev norm of order 1/2 in its maximal interval of existence, then the interval is infinite and the solution scatters. No radial assumption is made.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:58:35 GMT" } ]
2007-12-13T00:00:00
[ [ "Kenig", "Carlos E.", "" ], [ "Merle", "Frank", "" ] ]
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712.1835
Stephen C. Anco
Stephen C. Anco, George Bluman, Thomas Wolf
Invertible Mappings of Nonlinear PDEs to Linear PDEs Through Admitted Conservation Laws
20 pages. Published version to appear in a special issue "Geometric Methods in Differential Equations" of Acta Appl. Math
Acta Appl. Math. 101 (2008), 21-38
null
null
math-ph math.MP
null
An algorithmic method using conservation law multipliers is introduced that yields necessary and sufficient conditions to find invertible mappings of a given nonlinear PDE to some linear PDE and to construct such a mapping when it exists. Previous methods yielded such conditions from admitted point or contact symmetries of the nonlinear PDE. Through examples, these two linearization approaches are contrasted.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 21:58:30 GMT" }, { "version": "v2", "created": "Sat, 26 Jan 2008 16:58:34 GMT" } ]
2010-07-09T00:00:00
[ [ "Anco", "Stephen C.", "" ], [ "Bluman", "George", "" ], [ "Wolf", "Thomas", "" ] ]
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712.1836
Jens Eisert
K. Kieling, J. Eisert
Percolation in quantum computation and communication
Invited book chapter, "Quantum Percolation and Breakdown", Lecture Notes in Physics (Springer, Heidelberg, 2008). Also contains longer version of proof of main statement of quant-ph/0611140
Quantum and Semi-classical Percolation and Breakdown in Disordered Solids, pages 287-319 (Springer, Berlin, 2009)
null
null
quant-ph
null
This article is a draft of a book chapter of the book entitled "Quantum Percolation and Breakdown", to appear 2008.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 22:09:37 GMT" } ]
2009-05-15T00:00:00
[ [ "Kieling", "K.", "" ], [ "Eisert", "J.", "" ] ]
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712.1837
Jesus Cuevas
J Cuevas, G James, P G Kevrekidis, B A Malomed and B Sanchez-Rey
Approximated profiles for discrete solitons in DNLS lattices
13 pages, 14 figures. Submitted to Procceedings of NEEDS'07 Conference
J. Nonl. Math. Phys. 15, Supp. 3 (2008) 124-136
null
null
nlin.PS
null
We study four different approximations for finding the profile of discrete solitons in the one-dimensional Discrete Nonlinear Schr\"odinger (DNLS) Equation. Three of them are discrete approximations (namely, a variational approach, an approximation to homoclinic orbits and a Green-function approach), and the other one is a quasi-continuum approximation. All the results are compared with numerical computations.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 22:23:42 GMT" } ]
2015-05-20T00:00:00
[ [ "Cuevas", "J", "" ], [ "James", "G", "" ], [ "Kevrekidis", "P G", "" ], [ "Malomed", "B A", "" ], [ "Sanchez-Rey", "B", "" ] ]
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712.1838
Christina Markert
Christina Markert (for the STAR Collaboration)
Resonance production in heavy-ion collisions at STAR
SQM2007 proceedings, 7 pages, 7 figures
J.Phys.G35:044029,2008
10.1088/0954-3899/35/4/044029
null
nucl-ex
null
Hadronic resonances are sensitive to the properties of a hot and dense medium created in a heavy ion collisions. During the hadronic phase, after hadronization of quark and gluons into hadrons, resonances are useful to determine the lifetime between chemical and thermal freeze-out, under the assumption that the re-scattering of the decay particles and the probability of regeneration of resonances from hadrons depends on the system properties and the resonance lifetime. The system size and energy dependence of resonance spectra and yields will be shown and discussed in the context of the lifetime and size of the hadronic phase. Elliptic flow measurement will extend the sensitivity of resonance yields to the partonic state through additional information on constituent quark scaling. We also explore a possible new technique to extract signals from the early, potentially chirally symmetric, stage through the selection of resonances from jets.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 22:24:36 GMT" } ]
2019-08-13T00:00:00
[ [ "Markert", "Christina", "", "for the STAR Collaboration" ] ]
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712.1839
Ivan Khalzov
I. V. Khalzov, A. I. Smolyakov, V. I. Ilgisonis
Energy of eigen-modes in magnetohydrodynamic flows of ideal fluids
10 pages, 3 figures
Physics of Plasmas 15, 054501 (2008)
10.1063/1.2907164
null
astro-ph
null
Analytical expression for energy of eigen-modes in magnetohydrodynamic flows of ideal fluids is obtained. It is shown that the energy of unstable modes is zero, while the energy of stable oscillatory modes (waves) can assume both positive and negative values. Negative energy waves always correspond to non-symmetric eigen-modes -- modes that have a component of wave-vector along the equilibrium velocity. These results suggest that all non-symmetric instabilities in ideal MHD systems with flows are associated with coupling of positive and negative energy waves. As an example the energy of eigen-modes is calculated for incompressible conducting fluid rotating in axial magnetic field.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 22:26:53 GMT" } ]
2012-11-09T00:00:00
[ [ "Khalzov", "I. V.", "" ], [ "Smolyakov", "A. I.", "" ], [ "Ilgisonis", "V. I.", "" ] ]
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712.184
Adrian Vasiu
Adrian Vasiu
Geometry of Shimura varieties of Hodge type over finite fields
47 pages. Enlarged version of the three lectures we gave in July 2007 during the summer school "Higher dimensional geometry over finite fields", June 25 - July 06, 2007, Mathematisches Institut, Georg-August-Universit\"at G\"ottingen
Proceedings of the NATO Advanced Study Institute on Higher dimensional geometry over finite fields, G\"ottingen, Germany, June 25 - July 06 2007, 197--243, IOS Press.
null
null
math.NT math.AC
null
We present a general and comprehensive overview of recent developments in the theory of integral models of Shimura varieties of Hodge type. The paper covers the following topics: construction of integral models, their possible moduli interpretations, their uniqueness, their smoothness, their properness, and basic stratifications of their special fibres.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 22:36:11 GMT" } ]
2008-08-12T00:00:00
[ [ "Vasiu", "Adrian", "" ] ]
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712.1841
Jan Staff
Jan Staff, Brian Niebergal, and Rachid Ouyed
A three stage model for the inner engine of GRBs: Prompt emission and early afterglow
4 pages, to appear in the proceedings of the HEPRO conference, September 24-28, 2007, Dublin, Ireland
Int.J.Mod.Phys.D17:1383-1389,2008
10.1142/S0218271808012954
null
astro-ph
null
We describe a model within the ``Quark-nova'' scenario to interpret the recent observations of early X-ray afterglows of long Gamma-Ray Bursts (GRB) with the Swift satellite. This is a three-stage model within the context of a core-collapse supernova. STAGE 1 is an accreting (proto-) neutron star leading to a possible delay between the core collapse and the GRB. STAGE 2 is accretion onto a quark-star, launching an ultrarelativistic jet generating the prompt GRB. This jet also creates the afterglow as the jet interacts with the surrounding medium creating an external shock. Slower shells ejected from the quark star (during accretion), can re-energize the external shock leading to a flatter segment in the X-ray afterglow. STAGE 3, which occurs only if the quark-star collapses to form a black-hole, consists of an accreting black-hole. The jet launched in this accretion process interacts with the preceding quark star jet, and could generate the flaring activity frequently seen in early X-ray afterglows. Alternatively, a STAGE 2b can occur in our model if the quark star does not collapse to a black hole. The quark star in this case can then spin down due to magnetic braking, and the spin down energy may lead to flattening in the X-ray afterglow as well. This model seems to account for both the energies and the timescales of GRBs, in addition to the newly discovered early X-ray afterglow features.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 22:49:03 GMT" } ]
2009-06-23T00:00:00
[ [ "Staff", "Jan", "" ], [ "Niebergal", "Brian", "" ], [ "Ouyed", "Rachid", "" ] ]
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712.1842
Hyun Ho Lee
Hyun Ho Lee
A Note on Kasparov Product and Duality
12 pages, The organization of the paper is changed with further additional contents for an expository style
null
null
null
math.OA math.KT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using Paschke-Higson duality, we can get a natural index pairing $K_{i}(A) \times K_{i+1}(D_{\Phi}) \to \boldsymbol{Z} \quad (i=0,1) (\mbox{mod}2)$, where $A$ is a separable $C\sp*$-algebra, and $\Phi$ is a representation of $A$ on a separable infinite dimensional Hilbert space $H$. It is proved that this is a special case of the Kasparov Product. As a step, we show a proof of Bott-periodicity for KK-theory asserting that $\mathbb{C}_1$ and $S$ are $KK$-equivalent using the odd index pairing.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 22:53:13 GMT" }, { "version": "v2", "created": "Tue, 14 Sep 2010 08:27:52 GMT" } ]
2010-09-15T00:00:00
[ [ "Lee", "Hyun Ho", "" ] ]
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712.1843
David Eisenbud
David Eisenbud and Frank-Olaf Schreyer
Betti Numbers of Graded Modules and Cohomology of Vector Bundles
This version incorporates many corrections and many expository improvements of the original. It is to appear in the Journal of the American Mathematical Society
null
null
null
math.AC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mats Boij and Jonas Soederberg (math.AC/0611081) have conjectured that the Betti table of a Cohen-Macaulay module over a polynomial ring can be decomposed in a certain way as a positive linear combination of Betti tables of modules with pure resolutions. We prove, over any field, a strengthened form of their conjecture. Applications include a proof of the Multiplicity Conjecture of Huneke and Srinivasan and a proof of the convexity of a fan naturally associated to the Young lattice. We also characterize the rational cone of all cohomology tables of vector bundles on projective spaces in terms of the cohomology tables of "supernatural" bundles. This characterization is dual, in a certain sense, to our characterization of Betti tables.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 23:06:46 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 17:47:10 GMT" }, { "version": "v3", "created": "Sat, 12 Jul 2008 21:06:47 GMT" } ]
2008-07-14T00:00:00
[ [ "Eisenbud", "David", "" ], [ "Schreyer", "Frank-Olaf", "" ] ]
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712.1844
Delfim F. M. Torres
Gastao S. F. Frederico, Delfim F. M. Torres
Fractional Optimal Control in the Sense of Caputo and the Fractional Noether's Theorem
16 pages
Int. Math. Forum, 3, 2008, no. 10, 479--493.
null
null
math.OC math-ph math.MP
null
The study of fractional variational problems with derivatives in the sense of Caputo is a recent subject, the main results being Agrawal's necessary optimality conditions of Euler-Lagrange and respective transversality conditions. Using Agrawal's Euler-Lagrange equation and the Lagrange multiplier technique, we obtain here a Noether-like theorem for fractional optimal control problems in the sense of Caputo.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 23:19:29 GMT" } ]
2008-01-16T00:00:00
[ [ "Frederico", "Gastao S. F.", "" ], [ "Torres", "Delfim F. M.", "" ] ]
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712.1845
Andrew Inglis
Andrew Inglis, Luis Cruz, Dan L. Roe, H.E. Stanley, Douglas L. Rosene, Brigita Urbanc
Automated identification of neurons and their locations
38 pages. Formatted for two-sided printing. Supplemental material and software available at http://physics.bu.edu/~ainglis/ANRA/
null
null
null
physics.bio-ph q-bio.NC
null
Individual locations of many neuronal cell bodies (>10^4) are needed to enable statistically significant measurements of spatial organization within the brain such as nearest-neighbor and microcolumnarity measurements. In this paper, we introduce an Automated Neuron Recognition Algorithm (ANRA) which obtains the (x,y) location of individual neurons within digitized images of Nissl-stained, 30 micron thick, frozen sections of the cerebral cortex of the Rhesus monkey. Identification of neurons within such Nissl-stained sections is inherently difficult due to the variability in neuron staining, the overlap of neurons, the presence of partial or damaged neurons at tissue surfaces, and the presence of non-neuron objects, such as glial cells, blood vessels, and random artifacts. To overcome these challenges and identify neurons, ANRA applies a combination of image segmentation and machine learning. The steps involve active contour segmentation to find outlines of potential neuron cell bodies followed by artificial neural network training using the segmentation properties (size, optical density, gyration, etc.) to distinguish between neuron and non-neuron segmentations. ANRA positively identifies 86[5]% neurons with 15[8]% error (mean[st.dev.]) on a wide range of Nissl-stained images, whereas semi-automatic methods obtain 80[7]%/17[12]%. A further advantage of ANRA is that it affords an unlimited increase in speed from semi-automatic methods, and is computationally efficient, with the ability to recognize ~100 neurons per minute using a standard personal computer. ANRA is amenable to analysis of huge photo-montages of Nissl-stained tissue, thereby opening the door to fast, efficient and quantitative analysis of vast stores of archival material that exist in laboratories and research collections around the world.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 00:17:17 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 21:23:19 GMT" } ]
2008-05-01T00:00:00
[ [ "Inglis", "Andrew", "" ], [ "Cruz", "Luis", "" ], [ "Roe", "Dan L.", "" ], [ "Stanley", "H. E.", "" ], [ "Rosene", "Douglas L.", "" ], [ "Urbanc", "Brigita", "" ] ]
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712.1846
Craig Fennie
Craig J. Fennie, Ram Seshadri, and Karin M. Rabe
Lattice instabilities in cubic pyrochlore Bi$_2$Ti$_2$O$_7$
null
null
null
null
cond-mat.mtrl-sci
null
The oxide pyrochlore Bi$_2$Ti$_2$O$_7$ is in some ways analogous to perovskite PbTiO$_3$, in that Bi$_2$Ti$_2$O$_7$ has two cations, Bi$^{3+}$ and Ti$^{4+}$ in oxidation states that are normally associated with a propensity to off-center. However, unlike PbTiO$_3$, Bi$_2$Ti$_2$O$_7$ is experimentally observed to remain cubic down to 2 K, while the only observed ionic displacements are local and incoherent. Here we report first-principles calculations of the zone-center phonons of the ordered cubic pyrochlore which reveal several lattice instabilities. An analysis of the structural energetics suggest that the ordered cubic pyrochlore is unstable with respect to distortion towards a ferroelectric ground state with a large polarization. Our results suggest a key role of a frustrated soft polar mode in the dielectric properties of bismuth pyrochlores.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 23:33:15 GMT" } ]
2007-12-13T00:00:00
[ [ "Fennie", "Craig J.", "" ], [ "Seshadri", "Ram", "" ], [ "Rabe", "Karin M.", "" ] ]
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712.1847
Mario Cuoco
R. Fittipaldi, A. Vecchione, R. Ciancio, S. Pace, M. Cuoco, D. Stornaiuolo, D. Born, F. Tafuri, E. Olsson, S. Kittaka, H. Yaguchi, Y. Maeno
Superconductivity in Sr2RuO4-Sr3Ru2O7 eutectic crystals
Pages 4, figures 3, submitted to Phys. Rev. Lett
EPL 83, 27007 (2008)
10.1209/0295-5075/83/27007
null
cond-mat.supr-con cond-mat.str-el
null
Superconducting behavior has been observed in the Sr2RuO4-Sr3Ru2O7 eutectic system as grown by the flux-feeding floating zone technique. A supercurrent flows across a single interface between Sr2RuO4 and Sr3Ru2O7 areas at distances that are far beyond those expected in a conventional proximity scenario. The current-voltage characteristics within the Sr3Ru2O7 macrodomain, as extracted from the eutectic, exhibit signatures of superconductivity in the bilayered ruthenate. Detailed microstructural, morphological and compositional analyses address issues on the concentration and the size of Sr2RuO4 inclusions within the Sr3Ru2O7 matrix. We speculate on the possibility of inhomogeneous superconductivity in the eutectic Sr3Ru2O7 and exotic pairing induced by the Sr2RuO4 inclusions.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 23:36:57 GMT" } ]
2013-08-29T00:00:00
[ [ "Fittipaldi", "R.", "" ], [ "Vecchione", "A.", "" ], [ "Ciancio", "R.", "" ], [ "Pace", "S.", "" ], [ "Cuoco", "M.", "" ], [ "Stornaiuolo", "D.", "" ], [ "Born", "D.", "" ], [ "Tafuri", "F.", "" ], [ "Olsson", "E.", "" ], [ "Kittaka", "S.", "" ], [ "Yaguchi", "H.", "" ], [ "Maeno", "Y.", "" ] ]
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712.1848
Jeffrey Kuan
Alexei Borodin and Jeffrey Kuan
Asymptotics of Plancherel measures for the infinite-dimensional unitary group
39 pages
Advances in Mathematics, Volume 219, Issue 3, 20 October 2008, Pages 894-931
null
null
math.RT math-ph math.CO math.MP
null
We study a two-dimensional family of probability measures on infinite Gelfand-Tsetlin schemes induced by a distinguished family of extreme characters of the infinite-dimensional unitary group. These measures are unitary group analogs of the well-known Plancherel measures for symmetric groups. We show that any measure from our family defines a determinantal point process, and we prove that in appropriate scaling limits, such processes converge to two different extensions of the discrete sine process as well as to the extended Airy and Pearcey processes.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 23:38:18 GMT" } ]
2011-03-08T00:00:00
[ [ "Borodin", "Alexei", "" ], [ "Kuan", "Jeffrey", "" ] ]
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712.1849
E. L. Koschmieder
E.L. Koschmieder
Weak nuclear forces cause the strong nuclear force
12 pages, 1 figure
AIP Conf.Proc.1018:125-134,2008
10.1063/1.2947671
null
physics.gen-ph
null
We determine the strength of the weak nuclear force which holds the lattices of the elementary particles together. We also determine the strength of the strong nuclear force which emanates from the sides of the nuclear lattices. The strong force is the sum of the unsaturated weak forces at the surface of the nuclear lattices. The strong force is then about ten to the power of 6 times stronger than the weak force between two lattice points.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 23:51:38 GMT" } ]
2009-02-18T00:00:00
[ [ "Koschmieder", "E. L.", "" ] ]
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712.185
Ethan Thompson
Tatsuo Azeyanagi, Andreas Karch, Tadashi Takayanagi, Ethan G. Thompson
Holographic Calculation of Boundary Entropy
21 pages, 3 figures
JHEP 0803:054-054,2008
10.1088/1126-6708/2008/03/054
KUNS-2114
hep-th cond-mat.stat-mech
null
We use the holographic proposal for calculating entanglement entropies to determine the boundary entropy of defects in strongly coupled two-dimensional conformal field theories. We study several examples including the Janus solution and show that the boundary entropy extracted from the entanglement entropy as well as its more conventional definition via the free energy agree with each other. Maybe somewhat surprisingly we find that, unlike in the case of a conformal field theory with boundary, the entanglement entropy for a generic region in a theory with defect carries detailed information about the microscopic details of the theory. We also argue that the g-theorem for the boundary entropy is closely related to the strong subadditivity of the entanglement entropy.
[ { "version": "v1", "created": "Tue, 11 Dec 2007 23:55:16 GMT" } ]
2009-12-15T00:00:00
[ [ "Azeyanagi", "Tatsuo", "" ], [ "Karch", "Andreas", "" ], [ "Takayanagi", "Tadashi", "" ], [ "Thompson", "Ethan G.", "" ] ]
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712.1851
Giulia Zanderighi
R. Keith Ellis and Giulia Zanderighi
Scalar one-loop integrals for QCD
27 pages, 5 figures, associated fortran code available at http://qcdloop.fnal.gov/. New version corrects typographical error in Eq. 5.2
JHEP 0802:002,2008
10.1088/1126-6708/2008/02/002
Fermilab-PUB-07-633-T, OUTP-07/16P
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a basis set of infra-red and/or collinearly divergent scalar one-loop integrals and give analytic formulas, for tadpole, bubble, triangle and box integrals, regulating the divergences (ultra-violet, infra-red or collinear) by regularization in $D=4-2\epsilon$ dimensions. For scalar triangle integrals we give results for our basis set containing 6 divergent integrals. For scalar box integrals we give results for our basis set containing 16 divergent integrals. We provide analytic results for the 5 divergent box integrals in the basis set which are missing in the literature. Building on the work of van Oldenborgh, a general, publicly available code has been constructed, which calculates both finite and divergent one-loop integrals. The code returns the coefficients of $1/\epsilon^2,1/\epsilon^1$ and $1/\epsilon^0$ as complex numbers for an arbitrary tadpole, bubble, triangle or box integral.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 17:26:45 GMT" }, { "version": "v2", "created": "Sun, 16 Nov 2008 20:38:20 GMT" }, { "version": "v3", "created": "Thu, 8 Jul 2010 15:33:10 GMT" }, { "version": "v4", "created": "Tue, 28 Jun 2011 20:17:59 GMT" } ]
2011-06-30T00:00:00
[ [ "Ellis", "R. Keith", "" ], [ "Zanderighi", "Giulia", "" ] ]
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712.1852
Gasper Tkacik
Gasper Tkacik, William Bialek
Diffusion, dimensionality and noise in transcriptional regulation
8 pages, 2 figures
Phys. Rev. E 79, 051901 (2009)
10.1103/PhysRevE.79.051901
null
q-bio.MN q-bio.SC
null
The precision of biochemical signaling is limited by randomness in the diffusive arrival of molecules at their targets. For proteins binding to the specific sites on the DNA and regulating transcription, the ability of the proteins to diffuse in one dimension by sliding along the length of the DNA, in addition to their diffusion in bulk solution, would seem to generate a larger target for DNA binding, consequently reducing the noise in the occupancy of the regulatory site. Here we show that this effect is largely cancelled by the enhanced temporal correlations in one dimensional diffusion. With realistic parameters, sliding along DNA has surprisingly little effect on the physical limits to the precision of transcriptional regulation.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 00:41:48 GMT" } ]
2013-08-01T00:00:00
[ [ "Tkacik", "Gasper", "" ], [ "Bialek", "William", "" ] ]
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712.1853
Stefan Trotzky
S. Trotzky, P. Cheinet, S. F\"olling, M. Feld, U. Schnorrberger, A. M. Rey, A. Polkovnikov, E. A. Demler, M. D. Lukin and I. Bloch
Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
24 pages, 7 figures
Science, 319, p.295-299 (2008)
10.1126/science.1150841
null
cond-mat.other
null
Quantum mechanical superexchange interactions form the basis of quantum magnetism in strongly correlated electronic media. We report on the direct measurement of superexchange interactions with ultracold atoms in optical lattices. After preparing a spin-mixture of ultracold atoms in an antiferromagnetically ordered state, we measure a coherent superexchange-mediated spin dynamics with coupling energies from 5 Hz up to 1 kHz. By dynamically modifying the potential bias between neighboring lattice sites, the magnitude and sign of the superexchange interaction can be controlled, thus allowing the system to be switched between antiferromagnetic or ferromagnetic spin interactions. We compare our findings to predictions of a two-site Bose-Hubbard model and find very good agreement, but are also able to identify corrections which can be explained by the inclusion of direct nearest-neighbor interactions.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 01:37:38 GMT" } ]
2008-04-17T00:00:00
[ [ "Trotzky", "S.", "" ], [ "Cheinet", "P.", "" ], [ "Fölling", "S.", "" ], [ "Feld", "M.", "" ], [ "Schnorrberger", "U.", "" ], [ "Rey", "A. M.", "" ], [ "Polkovnikov", "A.", "" ], [ "Demler", "E. A.", "" ], [ "Lukin", "M. D.", "" ], [ "Bloch", "I.", "" ] ]
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712.1854
Soung Liew
S.C. Liew, C. Kai, J. Leung, B. Wong
Back-of-the-Envelope Computation of Throughput Distributions in CSMA Wireless Networks
null
null
null
null
cs.NI cs.PF
null
This work started out with our accidental discovery of a pattern of throughput distributions among links in IEEE 802.11 networks from experimental results. This pattern gives rise to an easy computation method, which we term back-of-the-envelop (BoE) computation, because for many network configurations, very accurate results can be obtained within minutes, if not seconds, by simple hand computation. BoE beats prior methods in terms of both speed and accuracy. While the computation procedure of BoE is simple, explaining why it works is by no means trivial. Indeed the majority of our investigative efforts have been devoted to the construction of a theory to explain BoE. This paper models an ideal CSMA network as a set of interacting on-off telegraph processes. In developing the theory, we discovered a number of analytical techniques and observations that have eluded prior research, such as that the carrier-sensing interactions among links in an ideal CSMA network result in a system state evolution that is time-reversible; and that the probability distribution of the system state is insensitive to the distributions of the "on" and "off" durations given their means, and is a Markov random field. We believe these theoretical frameworks are useful not just for explaining BoE, but could also be a foundation for a fundamental understanding of how links in CSMA networks interact. Last but not least, because of their basic nature, we surmise that some of the techniques and results developed in this paper may be applicable to not just CSMA networks, but also to other physical and engineering systems consisting of entities interacting with each other in time and space.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 01:41:54 GMT" } ]
2007-12-13T00:00:00
[ [ "Liew", "S. C.", "" ], [ "Kai", "C.", "" ], [ "Leung", "J.", "" ], [ "Wong", "B.", "" ] ]
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712.1855
Kazufumi Kimoto
Kazufumi Kimoto and Yoshinori Yamasaki
A variation of multiple $L$-values arising from the spectral zeta function of the non-commutative harmonic oscillator
10 pages
null
null
null
math.NT
null
A variation of multiple $L$-values, which arises from the description of the special values of the spectral zeta function of the non-commutative harmonic oscillator, is introduced. In some special cases, we show that its generating function can be written in terms of the gamma functions. This result enables us to obtain explicit evaluations of them.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 02:06:49 GMT" }, { "version": "v2", "created": "Thu, 8 May 2008 01:46:39 GMT" } ]
2008-05-08T00:00:00
[ [ "Kimoto", "Kazufumi", "" ], [ "Yamasaki", "Yoshinori", "" ] ]
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712.1856
Frederick W. Strauch
Frederick W. Strauch, Mark Edwards, Eite Tiesinga, Carl Williams, Charles W. Clark
Tunneling phase gate for neutral atoms in a double-well lattice
5 pages, 4 figures
null
10.1103/PhysRevA.77.050304
null
quant-ph
null
We propose a new two--qubit phase gate for ultra--cold atoms confined in an experimentally realized tilted double--well optical lattice [Sebby--Strabley et al., Phys. Rev. A {\bf 73} 033605 (2006)]. Such a lattice is capable of confining pairs of atoms in a two--dimensional array of double--well potentials where control can be exercised over the barrier height and the energy difference of the minima of the two wells (known as the ``tilt''). The four lowest single--particle motional states consist of two pairs of motional states in which each pair is localized on one side of the central barrier, allowing for two atoms confined in such a lattice to be spatially separated qubits. We present a time--dependent scheme to manipulate the tilt to induce tunneling oscillations which produce a collisional phase gate. Numerical simulations demonstrate that this gate can be performed with high fidelity.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 02:16:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Strauch", "Frederick W.", "" ], [ "Edwards", "Mark", "" ], [ "Tiesinga", "Eite", "" ], [ "Williams", "Carl", "" ], [ "Clark", "Charles W.", "" ] ]
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712.1857
Kiki Vierdayanti
Kiki Vierdayanti, Ken-ya Watarai, Shin Mineshige
On Black Hole Mass Estimation from X-ray Spectra of Ultraluminous X-ray Sources
14 pages, 9 figures, 6 tables (accepted, PASJ, Vol.60 No.3). Update: abstract and discussion
null
10.1093/pasj/60.3.653
null
astro-ph
null
We propose a methodology to derive a black-hole mass for super-critical accretion flow. Here, we use the extended disk blackbody (extended DBB) model, a fitting model in which the effective temperature profile obeys the relation $T_{\rm eff} \propto r^{-p}$, with $r$ being the disk radius and $p$ being treated as a fitting parameter. We first numerically calculate the theoretical flow structure and its spectra for a given black-hole mass, $M$, and accretion rate, $\dot{M}$. Through fitting to the theoretical spectra by the extended DBB model, we can estimate the black-hole mass, $M_{\rm x}$, assuming that the innermost disk radius is $r_{\rm in}=3r_{\rm g} (\propto M_{\rm x})$, where $r_{\rm g}$ is the Schwarzschild radius. We find, however, that the estimated mass deviates from that adopted in the spectral calculations, $M$, even for low-$\dot{M}$ cases. We also find that the deviations can be eliminated by introducing a new correction for the innermost radius. Using this correction, we calculate mass correction factors, $M/M_{\rm x}$, in the super-critical regimes for some sets of $M$ and $\dot M$, finding that a mass correction factor ranges between $M/M_{\rm x} \sim$ 1.2 -- 1.6. The higher is $\dot{M}$, the larger does the mass correction factor tend to be. Since the correction is relatively small, we can safely conclude that the black holes in ULXs which Vierdayanti et al. (2006, PASJ, 58, 915) analyzed are stellar-mass black holes with the mass being $< 100M_{\odot}$.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 02:24:25 GMT" }, { "version": "v2", "created": "Thu, 8 May 2008 02:35:32 GMT" } ]
2015-05-13T00:00:00
[ [ "Vierdayanti", "Kiki", "" ], [ "Watarai", "Ken-ya", "" ], [ "Mineshige", "Shin", "" ] ]
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712.1858
Satoru Yamamoto
Satoru Yamamoto, Hiroshi Kimura, Evgenij Zubko, Hiroshi Kobayashi, Koji Wada, Masateru Ishiguro, and Takafumi Matsui
Comet 9P/Tempel 1: Interpretation with the Deep Impact Results
11 pages, 1 figure, 1 table. ApJ letters, 673, L199-202
null
10.1086/527558
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
According to our common understandings, the original surface of a short-period comet nucleus has been lost by sublimation processes during its close approaches to the Sun. Sublimation results in the formation of a dust mantle on the retreated surface and in chemical differentiation of ices over tens or hundreds of meters below the mantle. In the course of NASA's Deep Impact mission, optical and infrared imaging observations of the ejecta plume were conducted by several researchers, but their interpretations of the data came as a big surprise: (1) The nucleus of comet 9P/Tempel 1 is free of a dust mantle, but maintains its pristine crust of submicron-sized carbonaceous grains; (2) Primordial materials are accessible already at a depth of several tens of cm with abundant silicate grains of submicrometer sizes. In this study, we demonstrate that a standard model of cometary nuclei explains well available observational data: (1) A dust mantle with a thickness of ~1-2 m builds up on the surface, where compact aggregates larger than tens of micrometers dominate; (2) Large fluffy aggregates are embedded in chemically differentiated layers as well as in the deepest part of the nucleus with primordial materials. We conclude that the Deep Impact results do not need any peculiar view of a comet nucleus.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 02:43:41 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 06:10:24 GMT" }, { "version": "v3", "created": "Thu, 20 Dec 2007 09:34:10 GMT" }, { "version": "v4", "created": "Wed, 26 Dec 2007 01:02:44 GMT" }, { "version": "v5", "created": "Wed, 10 Sep 2008 08:36:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Yamamoto", "Satoru", "" ], [ "Kimura", "Hiroshi", "" ], [ "Zubko", "Evgenij", "" ], [ "Kobayashi", "Hiroshi", "" ], [ "Wada", "Koji", "" ], [ "Ishiguro", "Masateru", "" ], [ "Matsui", "Takafumi", "" ] ]
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712.1859
Zhongmu Li
Zhongmu Li, Zhanwen Han
Fitting Formulae for the Effects of Binary Interactions on Lick Indices and Colours of Stellar Populations
19 pages, 5 tables, 6 figures, the formulae for Mgb line indices and colours are updated
null
null
null
astro-ph
null
More than about 50% stars of galaxies are in binaries, but most stellar population studies take single star-stellar population (ss-SSP) models, which do not take binary interactions into account. In fact, the integrated peculiarities of ss-SSPs are various from those of stellar populations with binary interactions (bs-SSPs). Therefore, it is necessary to investigate the effects of binary interactions on the Lick indices and colours of populations detailedly. We show some formulae for calculating the difference between the Lick indices and colours of bs-SSPs, and those of ss-SSPs. Twenty-five Lick indices and 12 colours are studied in the work. The results can be conveniently used for estimating the effects of binary interactions on stellar population studies and for adding the effects of binary interactions into existing ss-SSP models. The results and a few procedures can be obtained on request to the authors or via http://www.ynao.ac.cn/~bps/zhongmu/download.htm
[ { "version": "v1", "created": "Wed, 12 Dec 2007 08:09:06 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 01:45:38 GMT" } ]
2007-12-17T00:00:00
[ [ "Li", "Zhongmu", "" ], [ "Han", "Zhanwen", "" ] ]
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712.186
Alexander Itin
A.P.Itin and S.Watanabe
Integrability, stability, and adiabaticity in nonlinear stimulated Raman adiabatic passage
Presented on QUAMP-4 conference (UCL, London); 4 pages; bibliography is slightly extended as compared to a version published in PRL
Phys. Rev. Lett. 99, 223903 (2007)
10.1103/PhysRevLett.99.223903
null
cond-mat.other physics.class-ph quant-ph
null
We study dynamics of a two-color photoassociation of atoms into diatomic molecules via nonlinear Stimulated Raman adiabatic passage (STIRAP) process. This system has a famous counterpart in (linear) quantum mechanics, and been discussed recently in the context of generalizing quantum adiabatic theorem to nonlinear systems. Here we use another approach to study adiabaticity and stability in the system: we apply methods of classical Hamiltonian dynamics. We found nonlinear dynamical instabilities, cases of complete integrability, and improved conditions of adiabaticity.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 03:18:46 GMT" } ]
2007-12-13T00:00:00
[ [ "Itin", "A. P.", "" ], [ "Watanabe", "S.", "" ] ]
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712.1861
Xiao-Gang He
Xiao-Gang He (NTU)
CKM Phase and Spontaneous CP Violation
Latex 8 pages with one figure. Error in reference fixed
Int.J.Mod.Phys.A23:3282-3289,2008
10.1142/S0217751X08041980
null
hep-ph
null
The Standard Model for CP violation, the CKM model, works very well in explaining all laboratory experimental data. However, this model does not address the question that where it comes from. The origin of CP violation is still a mystery. In this talk I discuss a model\cite{model} addressing this problem in which the CP violating phase in the CKM matrix is identical to the phase in the Higgs potential resulting from spontaneous CP violation.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 03:24:58 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 23:50:52 GMT" } ]
2008-11-26T00:00:00
[ [ "He", "Xiao-Gang", "", "NTU" ] ]
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712.1862
De-en Jiang
De-en Jiang and Sheng Dai
Spin states of zigzag-edged Mobius graphene nanoribbons from first principles
17 pages, 4 figures
J. Phys. Chem. C, 112, 5348 (2008).
10.1021/jp711660k
null
physics.chem-ph
null
Mobius graphene nanoribbons have only one edge topologically. How the magnetic structures, previously associated with the two edges of zigzag-edged flat nanoribbons or cyclic nanorings, would change for their Mobius counterparts is an intriguing question. Using spin-polarized density functional theory, we shed light on this question. We examine spin states of zigzag-edged Mobius graphene nanoribbons (ZMGNRs) with different widths and lengths. We find a triplet ground state for a Mobius cyclacene, while the corresponding two-edged cyclacene has an open-shell singlet ground state. For wider ZMGNRs, the total magnetization of the ground state is found to increase with the ribbon length. For example, a quintet ground state is found for a ZMGNR. Local magnetic moments on the edge carbon atoms form domains of majority and minor spins along the edge. Spins at the domain boundaries are found to be frustrated. Our findings show that the Mobius topology (i.e., only one edge) causes ZMGNRs to favor one spin over the other, leading to a ground state with non-zero total magnetization.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 03:36:25 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 16:54:31 GMT" }, { "version": "v3", "created": "Sun, 18 May 2008 15:24:11 GMT" } ]
2008-05-18T00:00:00
[ [ "Jiang", "De-en", "" ], [ "Dai", "Sheng", "" ] ]
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712.1863
Weng-Long Chang
Weng-Long Chang, Michael (Shan-Hui) Ho, and Minyi Guo
Constructing Bio-molecular Databases on a DNA-based Computer
The article includes 35 pages, several tables and figures
null
null
null
cs.NE cs.DB q-bio.OT
null
Codd [Codd 1970] wrote the first paper in which the model of a relational database was proposed. Adleman [Adleman 1994] wrote the first paper in which DNA strands in a test tube were used to solve an instance of the Hamiltonian path problem. From [Adleman 1994], it is obviously indicated that for storing information in molecules of DNA allows for an information density of approximately 1 bit per cubic nm (nanometer) and a dramatic improvement over existing storage media such as video tape which store information at a density of approximately 1 bit per 1012 cubic nanometers. This paper demonstrates that biological operations can be applied to construct bio-molecular databases where data records in relational tables are encoded as DNA strands. In order to achieve the goal, DNA algorithms are proposed to perform eight operations of relational algebra (calculus) on bio-molecular relational databases, which include Cartesian product, union, set difference, selection, projection, intersection, join and division. Furthermore, this work presents clear evidence of the ability of molecular computing to perform data retrieval operations on bio-molecular relational databases.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 03:58:01 GMT" } ]
2007-12-13T00:00:00
[ [ "Chang", "Weng-Long", "", "Shan-Hui" ], [ "Michael", "", "", "Shan-Hui" ], [ "Ho", "", "" ], [ "Guo", "Minyi", "" ] ]
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712.1864
Craig Antonio Pastro
Brian Day and Craig Pastro
On endomorphism algebras of separable monoidal functors
17 pages
Theory and Applications of Categories 22 (2009) 77-96
null
null
math.CT math.QA
null
We show that the (co)endomorphism algebra of a sufficiently separable "fibre" functor into Vect_k, for k a field of characteristic 0, has the structure of what we call a "unital" von Neumann core in Vect_k. For Vect_k, this particular notion of algebra is weaker than that of a Hopf algebra, although the corresponding concept in Set is again that of a group.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 04:01:04 GMT" } ]
2010-03-03T00:00:00
[ [ "Day", "Brian", "" ], [ "Pastro", "Craig", "" ] ]
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712.1865
Jesse Ratzkin
Karsten Grosse-Brauckmann, Nicholas J. Korevaar, Robert B. Kusner, Jesse Ratzkin, John M. Sullivan
Coplanar k-unduloids are nondegenerate
19 pages, no figures; improvements to exposition
Int. Math. Res. Not. 2009, 3391-3416
null
null
math.DG math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove each embedded, constant mean curvature (CMC) surface in Euclidean space with genus zero and finitely many coplanar ends is nondegenerate: there is no nontrivial square-integrable solution to the Jacobi equation, the linearization of the CMC condition. This implies that the moduli space of such coplanar surfaces is a real-analytic manifold and that a neighborhood of these in the full CMC moduli space is itself a manifold. Nondegeneracy further implies (infinitesimal and local) rigidity in the sense that the asymptotes map is an analytic immersion on these spaces, and also that the coplanar classifying map is an analytic diffeomorphism.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 20:29:13 GMT" }, { "version": "v2", "created": "Fri, 12 Dec 2008 12:47:33 GMT" } ]
2010-06-14T00:00:00
[ [ "Grosse-Brauckmann", "Karsten", "" ], [ "Korevaar", "Nicholas J.", "" ], [ "Kusner", "Robert B.", "" ], [ "Ratzkin", "Jesse", "" ], [ "Sullivan", "John M.", "" ] ]
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712.1866
Jeong-Eun Lee
Jeong-Eun Lee
Chemical Evolution in VeLLOs
corrected e-mail address
null
10.5303/JKAS.2007.40.4.083
null
astro-ph
null
A new type of object called "Very Low Luminosity Objects (VeLLOs)" has been discovered by the Spitzer Space Telescope. VeLLOs might be substellar objects forming by accretion. However, some VeLLOs are associated with strong outflows, indicating the previous existence of massive accretion. The thermal history, which significantly affects the chemistry, between substellar objects with a continuous low accretion rate and objects in a quiescent phase after massive accretion (outburst) must be greatly different. In this study, the chemical evolution has been calculated in an episodic accretion model to show that CO and N2H+ have a relation different from starless cores or Class 0/I objects. Furthermore, the CO2 ice feature at 15.2 micron will be a good tracer of the thermal process in VeLLOs.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 04:14:44 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 00:44:19 GMT" } ]
2017-01-18T00:00:00
[ [ "Lee", "Jeong-Eun", "" ] ]
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712.1867
Alexander E. Holroyd
Alexander E. Holroyd, Robin Pemantle, Yuval Peres and Oded Schramm
Poisson Matching
37 pages; to appear in Annales de l'institut Henri Poincare (B)
null
null
null
math.PR
null
Suppose that red and blue points occur as independent homogeneous Poisson processes in R^d. We investigate translation-invariant schemes for perfectly matching the red points to the blue points. For any such scheme in dimensions d=1,2, the matching distance X from a typical point to its partner must have infinite d/2-th moment, while in dimensions d>=3 there exist schemes where X has finite exponential moments. The Gale-Shapley stable marriage is one natural matching scheme, obtained by iteratively matching mutually closest pairs. A principal result of this paper is a power law upper bound on the matching distance X for this scheme. A power law lower bound holds also. In particular, stable marriage is close to optimal (in tail behavior) in d=1, but far from optimal in d>=3. For the problem of matching Poisson points of a single color to each other, in d=1 there exist schemes where X has finite exponential moments, but if we insist that the matching is a deterministic factor of the point process then X must have infinite mean.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 06:27:08 GMT" }, { "version": "v2", "created": "Sun, 9 Mar 2008 02:52:08 GMT" }, { "version": "v3", "created": "Sat, 15 Mar 2008 05:05:49 GMT" } ]
2008-03-15T00:00:00
[ [ "Holroyd", "Alexander E.", "" ], [ "Pemantle", "Robin", "" ], [ "Peres", "Yuval", "" ], [ "Schramm", "Oded", "" ] ]
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712.1868
Chin-Ping Hu
Chin-Ping Hu, Yi Chou, and Yi-Ying Chung
Parameterization studies of the properties of the X-ray dips for Low Mass X-ray binary X1916-053
accepted by ApJ
null
10.1086/527549
null
astro-ph
null
The ultra-compact Low Mass X-ray Binary (LMXB) X1916-053, composed of a neutron star and a semi-degenerated white dwarf, exhibits periodic X-ray dips with variable width and depth. We have developed new methods to parameterize the dip to systematically study its variations. This helps to further understand binary and accretion disk behaviors. The RXTE 1998 observations clearly show a 4.87d periodic variation of the dip width. This is probably due to the nodal precession of the accretion disk, although there are no significant sidebands in the spectrum from the epoch folding search. From the negative superhump model (Larwood et. al. 1996), the mass ratio can be estimated as q = 0.045. Combined with more than 24 years of historical data, we found an orbital period derivative of $\dot{P}_{orb}/P_{orb}=(1.62 \pm 0.48)\times 10^{-7} yr^{-1}$ and established a quadratic ephemeris for the X-ray dips. The period derivative seems inconsistent with the prediction of the standard model of binary orbital evolution proposed by Rappaport et. al. (1987). On the other hand, the radiation-driven model (Tavani et. al. 1991) may properly interpret the period derivative even though the large mass outflow predicted by this model has never been observed in this system. With the best ephemeris, we obtained that the standard deviation of primary dips are smaller than that of secondary dips. This means that the primary dips are more stable than the secondary dips. Thus, we conclude that the primary dips of X1916-053 occur from the bulge at the rim instead of the ring of the disk proposed by Frank et. al. (1987).
[ { "version": "v1", "created": "Wed, 12 Dec 2007 05:34:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Chin-Ping", "" ], [ "Chou", "Yi", "" ], [ "Chung", "Yi-Ying", "" ] ]
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712.1869
Pierre Leroux
Andrei Gagarin (1), Gilbert Labelle (2), Pierre Leroux (2) and Timothy Walsh (2) ((1) Acadia Un. Wolfville N. S. Canada, (2) LaCIM UQAM Montreal Qc Canada)
Two-connected graphs with prescribed three-connected components
Work presented at the Ottawa-Carleton Discrete Mathematics Workshop, May 25-26, 2007 and at the Seminaire Lotharingien de Combinatoire, Bertinoro, Italy, September 24-26, 2007. 32 pages. 11 pdf figures. Version 2: Minor revisions, one Table added
Adv. in Appl. Math. 43 (2009), no. 1, pp. 46-74
10.1016/j.aam.2009.01.002
null
math.CO cs.DM
null
We adapt the classical 3-decomposition of any 2-connected graph to the case of simple graphs (no loops or multiple edges). By analogy with the block-cutpoint tree of a connected graph, we deduce from this decomposition a bicolored tree tc(g) associated with any 2-connected graph g, whose white vertices are the 3-components of g (3-connected components or polygons) and whose black vertices are bonds linking together these 3-components, arising from separating pairs of vertices of g. Two fundamental relationships on graphs and networks follow from this construction. The first one is a dissymmetry theorem which leads to the expression of the class B=B(F) of 2-connected graphs, all of whose 3-connected components belong to a given class F of 3-connected graphs, in terms of various rootings of B. The second one is a functional equation which characterizes the corresponding class R=R(F) of two-pole networks all of whose 3-connected components are in F. All the rootings of B are then expressed in terms of F and R. There follow corresponding identities for all the associated series, in particular the edge index series. Numerous enumerative consequences are discussed.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 05:14:46 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 19:55:22 GMT" } ]
2010-12-24T00:00:00
[ [ "Gagarin", "Andrei", "" ], [ "Labelle", "Gilbert", "" ], [ "Leroux", "Pierre", "" ], [ "Walsh", "Timothy", "" ] ]
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712.187
Shouchuan Zhang
Yange Xu, Shouchuan Zhang, Jing Cheng
Duality Theorem and Hom Functor in Braided Tensor Categories
27Pages
null
null
null
math.QA
null
Blatter-Montgomery duality theorem is generalized into braided tensor categories. It is shown that $Hom(V,W)$ is a braided Yetter-Drinfeld module for any two braided Yetter-Drinfeld modules $V$ and $W$.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 05:38:32 GMT" } ]
2007-12-13T00:00:00
[ [ "Xu", "Yange", "" ], [ "Zhang", "Shouchuan", "" ], [ "Cheng", "Jing", "" ] ]
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712.1871
Robert A. Gruendl
You-Hua Chu and Robert A. Gruendl (University of Illinois)
Were All Massive Stars Born in OB Associations and Clusters?
8 pages, 6 figures, Massive Star Formation: Observations Confront Theory, held at Heidelberg on September 10-14, 2007
null
null
null
astro-ph
null
It has been commonly conjectured that all massive >10 Msun stars are born in OB associations or clusters. Many O and B stars in the Galaxy or the Magellanic Clouds appear to exist in isolation, however. While some of these field OB stars have been ejected from their birthplaces, some are too far away from massive star forming regions to be runaways. Can massive stars form in isolation? The Spitzer survey of the Large Magellanic Cloud (aka SAGE) provides a unique opportunity for us to investigate and characterize the formation sites of massive stars for an entire galaxy. We have identified all massive young stellar objects (YSOs) in the Large Magellanic Cloud. We find that ~85% of the massive YSOs are in giant molecular clouds and ~65% are in OB associations. Only ~7% of the massive YSOs are neither in OB associations nor in giant molecular clouds. This fraction of isolated massive stars in the Large Magellanic Cloud is comparable to the 5-10% found in the Galaxy.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 06:09:08 GMT" } ]
2007-12-13T00:00:00
[ [ "Chu", "You-Hua", "", "University of Illinois" ], [ "Gruendl", "Robert A.", "", "University of Illinois" ] ]
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712.1872
Andreas Lager{\aa}s
Peter Jagers, Andreas Nordvall Lager{\aa}s
Supercritical general branching processes conditioned on extinction are subcritical
6 pages
null
null
null
math.PR
null
It is well known that a simple, supercritical Bienaym\'e-Galton-Watson process turns into a subcritical such process, if conditioned to die out. We prove that the corresponding holds true for general, multi-type branching, where child-bearing may occur at different ages, life span may depend upon reproduction, and the whole course of events is thus affected by conditioning upon extinction.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 06:23:42 GMT" } ]
2007-12-13T00:00:00
[ [ "Jagers", "Peter", "" ], [ "Lagerås", "Andreas Nordvall", "" ] ]
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712.1873
Mohammad Reza Setare
M. R. Setare, J. Sadeghi, A. R. Amani
Shape invariance method for quintom model in the bent brane background
13 pages, no figure
Phys.Lett.B660:299-306,2008
10.1016/j.physletb.2008.01.024
null
hep-th
null
In the present paper, we study the braneworld scenarios in the presence of quintom dark energy coupled by gravity. The first-order formalism for the bent brane (for both de Sitter and anti-de Sitter geometry), leads us to discuss the shape invariance method in the bent brane systems. So, by using the fluctuations of metric and quintom fields we obtain the Schrodinger equation. Then we factorize the corresponding Hamiltonian in terms of multiplication of the first-order differential operators. These first-order operators lead us to obtain the energy spectrum with the help of shape invariance method.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 06:26:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Setare", "M. R.", "" ], [ "Sadeghi", "J.", "" ], [ "Amani", "A. R.", "" ] ]
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712.1874
Ryo Takahashi
Ryo Takahashi
On localizing subcategories of derived categories
12 pages, some corrections, to appear in J. Math. Kyoto Univ
null
null
null
math.AC math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let A be a commutative noetherian ring. In this paper, we interpret localizing subcategories of the derived category of A by using subsets of Spec A and subcategories of the category of A-modules. We unify theorems of Gabriel, Neeman and Krause.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 07:17:22 GMT" }, { "version": "v2", "created": "Tue, 14 Jul 2009 22:07:50 GMT" } ]
2009-07-15T00:00:00
[ [ "Takahashi", "Ryo", "" ] ]
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712.1875
Michel Fliess
Michel Fliess (INRIA Futurs)
Critique du rapport signal \`a bruit en th\'eorie de l'information -- A critical appraisal of the signal to noise ratio in information theory
null
null
null
null
cs.IT math.IT math.LO math.PR math.RA quant-ph
null
The signal to noise ratio, which plays such an important role in information theory, is shown to become pointless in digital communications where - symbols are modulating carriers, which are solutions of linear differential equations with polynomial coefficients, - demodulations is achieved thanks to new algebraic estimation techniques. Operational calculus, differential algebra and nonstandard analysis are the main mathematical tools.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 07:20:54 GMT" } ]
2007-12-13T00:00:00
[ [ "Fliess", "Michel", "", "INRIA Futurs" ] ]
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712.1876
Dafa Li
D. Li, X. Li, H. Huang, X. Li
SLOCC classification for nine families of four-qubits
19 pages, no figures
quantum information and computation, Vol. 9, No. 9 & 10 (2009) 0778-0800
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In Phys. Rev. A 62, 062314 (2000), D\"{u}r, Vidal and Cirac indicated that there are infinitely many SLOCC classes for four qubits. Verstraete, Dehaene, and Verschelde in Phys. Rev. A 65, 052112 (2002) proposed nine families of states corresponding to nine different ways of entangling four qubits. In Phys. Rev. A 75, 022318 (2007), Lamata et al. reported that there are eight true SLOCC entanglement classes of four qubits up to permutations of the qubits. In this paper, we investigate SLOCC classification of the nine families proposed by Verstraete, Dehaene and Verschelde, and distinguish 49 true SLOCC entanglement classes from them.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 07:33:20 GMT" }, { "version": "v2", "created": "Sun, 23 Dec 2007 09:10:19 GMT" }, { "version": "v3", "created": "Mon, 14 Dec 2009 07:29:20 GMT" } ]
2009-12-14T00:00:00
[ [ "Li", "D.", "" ], [ "Li", "X.", "" ], [ "Huang", "H.", "" ], [ "Li", "X.", "" ] ]
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712.1877
Yunhi Cho
Yunhi Cho
Trigonometry in extended hyperbolic space and extended de Sitter space
31 pages 20 figures
Bull.Korean Math. Soc. 46(2009), No.6, pp. 1099-1133
null
null
math.MG
null
We study the hyperbolic cosine and sine laws in the extended hyperbolic space which contains hyperbolic space as a subset and is an analytic continuation of the hyperbolic space. And we also study the spherical cosine and sine laws in the extended de Sitter space which contains de Sitter Space $S^n_1$ as a subset and is also an analytic continuation of de Sitter space. In fact, the extended hyperbolic space and extended de Sitter space are the same space only differ by -1 multiple in the metric. Hence these two extended spaces clearly show and apparently explain that why many corresponding formulas in hyperbolic and spherical space are very similar each other. From these extended trigonometry laws, we can give a coherent and geometrically simple explanation for the various relations between the lengths and angles of hyperbolic polygons and relations on de Sitter polygons which lie on $S^2_1$.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 07:44:52 GMT" } ]
2010-01-05T00:00:00
[ [ "Cho", "Yunhi", "" ] ]
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712.1878
Luc Brun
Jean Hugues Pruvot (GREYC), Luc Brun (GREYC)
Hierarchy construction schemes within the Scale set framework
null
Dans Graph-Based Representations in Pattern Recognition - Graph based Representation 2007, Alicante : Espagne (2007)
null
null
cs.CV
null
Segmentation algorithms based on an energy minimisation framework often depend on a scale parameter which balances a fit to data and a regularising term. Irregular pyramids are defined as a stack of graphs successively reduced. Within this framework, the scale is often defined implicitly as the height in the pyramid. However, each level of an irregular pyramid can not usually be readily associated to the global optimum of an energy or a global criterion on the base level graph. This last drawback is addressed by the scale set framework designed by Guigues. The methods designed by this author allow to build a hierarchy and to design cuts within this hierarchy which globally minimise an energy. This paper studies the influence of the construction scheme of the initial hierarchy on the resulting optimal cuts. We propose one sequential and one parallel method with two variations within both. Our sequential methods provide partitions near the global optima while parallel methods require less execution times than the sequential method of Guigues even on sequential machines.
[ { "version": "v1", "created": "Wed, 12 Dec 2007 07:45:08 GMT" } ]
2007-12-13T00:00:00
[ [ "Pruvot", "Jean Hugues", "", "GREYC" ], [ "Brun", "Luc", "", "GREYC" ] ]
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