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801.3273
Johan Peter Uldall Fynbo
Johan P. U. Fynbo (1), J. Xavier Prochaska (2), Jesper Sommer-Larsen (3,1), Miroslava Dessauges-Zavadsky (4), Palle Moller (5) ((1) Dark Cosmology Centre, NBI, Copenhagen, Denmark; (2) UCO/Lick Observatory, USA; (3) Excellence Cluster Universe, TUM, Munich, Germany; (4) Geneva Observatory, Switzerland; (5) European Southern Observatory, Garching, Germany)
Reconciling the Metallicity Distributions of Gamma-ray Burst, Damped Lyman-alpha, and Lyman-break Galaxies at z=3
31 pages, 6 figures. Accepted for publication in ApJ
Astrophys. J. 683 (2008) 321-328
10.1086/589555
null
astro-ph
null
We test the hypothesis that the host galaxies of long-duration gamma-ray bursts (GRBs) as well as quasar-selected damped Lyman-alpha (DLA) systems are drawn from the population of UV-selected star-forming, high-z galaxies (generally referred to as Lyman-break galaxies). Specifically, we compare the metallicity distributions of the GRB and DLA populations to simple models where these galaxies are drawn randomly from the distribution of star-forming galaxies according to their star-formation rate and HI cross-section respectively. We find that it is possible to match both observational distributions assuming very simple and constrained relations between luminosity, metallicity and HI sizes. The simple model can be tested by observing the luminosity distribution of GRB host galaxies and by measuring the luminosity and impact parameters of DLA selected galaxies as a function of metallicity. Our results support the expectation that GRB and DLA samples, in contrast to magnitude limited surveys, provide an almost complete census of z=3 star-forming galaxies that are not heavily dust-obscured.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:24:46 GMT" }, { "version": "v2", "created": "Sun, 13 Apr 2008 10:55:13 GMT" } ]
2008-08-08T00:00:00
[ [ "Fynbo", "Johan P. U.", "" ], [ "Prochaska", "J. Xavier", "" ], [ "Sommer-Larsen", "Jesper", "" ], [ "Dessauges-Zavadsky", "Miroslava", "" ], [ "Moller", "Palle", "" ] ]
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801.3274
Zohar Komargodski
Zohar Komargodski
On collinear factorization of Wilson loops and MHV amplitudes in N=4 SYM
26 pages, 7 figures, JHEP format. v2: minor corrections. v3: minor improvements
JHEP 0805:019,2008
10.1088/1126-6708/2008/05/019
WIS/01/08-JAN-DPP
hep-th
null
We consider the (multi) Splitting function of Wilson loops and MHV gluon scattering S matrix elements in N=4 SYM. At strong coupling, one can utilize the methods of Alday and Maldacena and at weak coupling (one loop) the correspondence to light like Wilson loops is used. In both cases, the (multi) Splitting function corresponds to flattened cusps in the light like polygon, allowing for a clean disentanglement from the other gluons. We compute it in some cases and estimate some terms in other cases. We also prove the anomalous Ward identity of Drummond et al. in the strong coupling regime. Lastly, we briefly comment on a possible strategy for a proof of collinear factorization of Wilson loops at higher orders of perturbation theory.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:05:36 GMT" }, { "version": "v2", "created": "Tue, 11 Mar 2008 21:24:57 GMT" }, { "version": "v3", "created": "Thu, 17 Apr 2008 12:24:48 GMT" } ]
2014-11-18T00:00:00
[ [ "Komargodski", "Zohar", "" ] ]
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801.3275
Robert Feldmann
R. Feldmann, C. M. Carollo, C. Porciani, S. J. Lilly, P. Oesch
The Zurich Extragalactic Bayesian Redshift Analyzer (ZEBRA), version 1.0 -- User manual
33 pages, 3 Figures, 7 Tables. title and abstract adjusted. ZEBRA is available at http://www.exp-astro.phys.ethz.ch/ZEBRA
null
null
null
astro-ph
null
ZEBRA, the Zurich Extragalactic Bayesian Redshift Analyzer, is a tool for estimating redshifts and template types of galaxies using medium- and broad-band photometric data. ZEBRA employs novel techniques within the template-fitting approach to produce high-quality Maximum-Likelihood and Bayesian redshift estimates. This manuscript serves as a user guide to ZEBRA. It explains how to use ZEBRA, specifies input and output formats, and gives a short account of the available options. ZEBRA is a free and open-source software distributed under the GNU Public License 3 and available at http://www.exp-astro.phys.ethz.ch/ZEBRA . Several upgrades are currently being implemented in ZEBRA. An updated documentation will be provided at each new release. Any problems, comments and suggestions on the code and the manual should be sent via e-mail to [email protected].
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:11:25 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 09:39:38 GMT" } ]
2008-02-04T00:00:00
[ [ "Feldmann", "R.", "" ], [ "Carollo", "C. M.", "" ], [ "Porciani", "C.", "" ], [ "Lilly", "S. J.", "" ], [ "Oesch", "P.", "" ] ]
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801.3276
Asantha R. Cooray
Paolo Serra, Asantha Cooray (Irvine)
Impact of Secondary non-Gaussianities on the Search for Primordial Non-Gaussianity with CMB Maps
4 pages; submitted as a PRD Brief Report
Phys.Rev.D77:107305,2008
10.1103/PhysRevD.77.107305
null
astro-ph
null
When constraining the primordial non-Gaussianity parameter f_NL with cosmic microwave background anisotropy maps, the bias resulting from the covariance between primordial non-Gaussianity and secondary non-Gaussianities to the estimator of f_NL is generally assumed to be negligible. We show that this assumption may not hold when attempting to measure the primordial non-Gaussianity out to angular scales below a few tens arcminutes with an experiment like Planck, especially if the primordial non-Gaussianity parameter is around the minimum detectability level with f_NL between 5 and 10. In future, it will be necessary to jointly estimate the combined primordial and secondary contributions to the CMB bispectrum and establish f_NL by properly accounting for the confusion from secondary non-Gaussianities.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:11:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Serra", "Paolo", "", "Irvine" ], [ "Cooray", "Asantha", "", "Irvine" ] ]
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801.3277
Doug Pickrell
Doug Pickrell
Homogeneous Poisson Structures on Loop Spaces of Symmetric Spaces
This is a contribution to the Special Issue on Kac-Moody Algebras and Applications, published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4 (2008), 069, 33 pages
10.3842/SIGMA.2008.069
null
math.SG math-ph math.MP
http://creativecommons.org/licenses/by-nc-sa/3.0/
This paper is a sequel to [Caine A., Pickrell D., arXiv:0710.4484], where we studied the Hamiltonian systems which arise from the Evens-Lu construction of homogeneous Poisson structures on both compact and noncompact type symmetric spaces. In this paper we consider loop space analogues. Many of the results extend in a relatively routine way to the loop space setting, but new issues emerge. The main point of this paper is to spell out the meaning of the results, especially in the SU(2) case. Applications include integral formulas and factorizations for Toeplitz determinants.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:13:40 GMT" }, { "version": "v2", "created": "Sat, 14 Jun 2008 18:51:24 GMT" }, { "version": "v3", "created": "Sun, 13 Jul 2008 17:30:49 GMT" }, { "version": "v4", "created": "Tue, 7 Oct 2008 07:27:46 GMT" } ]
2008-10-07T00:00:00
[ [ "Pickrell", "Doug", "" ] ]
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801.3278
David Shih
Patrick Meade, Nathan Seiberg, David Shih
General Gauge Mediation
19 pages, 1 figure, minor changes
Prog.Theor.Phys.Suppl.177:143-158,2009
10.1143/PTPS.177.143
null
hep-ph hep-th
null
We give a general definition of gauge mediated supersymmetry breaking which encompasses all the known gauge mediation models. In particular, it includes both models with messengers as well as direct mediation models. A formalism for computing the soft terms in the generic model is presented. Such a formalism is necessary in strongly-coupled direct mediation models where perturbation theory cannot be used. It allows us to identify features of the entire class of gauge mediation models and to distinguish them from specific signatures of various subclasses.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:14:42 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 18:56:37 GMT" }, { "version": "v3", "created": "Sat, 8 Mar 2008 00:04:57 GMT" } ]
2009-09-15T00:00:00
[ [ "Meade", "Patrick", "" ], [ "Seiberg", "Nathan", "" ], [ "Shih", "David", "" ] ]
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801.3279
Allan Greenleaf
Allan Greenleaf, Yaroslav Kurylev, Matti Lassas and Gunther Uhlmann
Comment on "Scattering Theory Derivation of a 3D Acoustic Cloaking Shell"
3 pages, RevTex
null
null
null
physics.optics
null
In a recent Letter, Cummer et al. give a description of material parameters for acoustic wave propagation giving rise to a 3D spherical cloak, and verify the cloaking phenomenon on the level of scattering coefficients. A similar configuration has been given by Chen and Chan. In this Comment, we show that these theoretical constructions follow directly from our earlier work http://arxiv.org/abs/math/0611185 on full wave analysis of cloaking for the Helmholtz equation with respect to Riemannian metrics. Furthermore, the analysis there covers the case of acoustically radiating objects being enclosed in the cloaked region.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:23:47 GMT" } ]
2008-01-23T00:00:00
[ [ "Greenleaf", "Allan", "" ], [ "Kurylev", "Yaroslav", "" ], [ "Lassas", "Matti", "" ], [ "Uhlmann", "Gunther", "" ] ]
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801.328
Cristina Buzea
Cristina Buzea, Ivan I. Pacheco, Kevin Robbie
Nanomaterials and nanoparticles: Sources and toxicity
State of the art review on nanoparticles and dust toxicity intended for a wide audience. Comprehensible to non-specialists in medicine - contains minidictionary of medical terminology; 41 Figures, 4 Tables, 103 pages, 345 references
Published in Biointerphases Vol. 2, issue 4 (2007) pages MR17 - MR71
null
null
physics.med-ph
null
This review is written with the goal of informing public health concerns related to nanoscience, while raising awareness of nanomaterials toxicity among scientists and manufacturers handling them. We show that humans have always been exposed to nanoparticles and dust from natural sources and human activities, the recent development of industry and combustion-based engine transportation profoundly increasing anthropogenic nanoparticulate pollution. The key to understanding the toxicity of nanoparticles is that their minute size, smaller than cells and cellular organelles, allows them to penetrate these basic biological structures, disrupting their normal function. Among diseases associated with nanoparticles are asthma, bronchitis, lung cancer, neurodegenerative diseases (such as Parkinson`s and Alzheimer`s diseases), Crohn`s disease, colon cancer. Nanoparticles that enter the circulatory system are related to occurrence of arteriosclerosis, and blood clots, arrhythmia, heart diseases, and ultimately cardiac death. We show that possible adverse effects of nanoparticles on human health depend on individual factors such as genetics and existing disease, as well as exposure, and nanoparticle chemistry, size, shape, and agglomeration state. The faster we will understand their causes and mechanisms, the more likely we are to find cures for diseases associated with nanoparticle exposure. We foresee a future with better-informed, and hopefully more cautious manipulation of engineered nanomaterials, as well as the development of laws and policies for safely managing all aspects of nanomaterial manufacturing, industrial and commercial use, and recycling.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 20:36:12 GMT" } ]
2008-01-23T00:00:00
[ [ "Buzea", "Cristina", "" ], [ "Pacheco", "Ivan I.", "" ], [ "Robbie", "Kevin", "" ] ]
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801.3281
Arunava Roy
Arunava Roy and Marco Cavaglia
Discriminating Supersymmetry and Black Holes at the Large Hadron Collider
12 pages, 8 figures
Phys.Rev.D77:064029,2008
10.1103/PhysRevD.77.064029
null
hep-ph
null
We show how to differentiate the minimal supersymmetric extension of the standard model from black hole events at the Large Hadron Collider. Black holes are simulated with the CATFISH generator. Supersymmetry simulations use a combination of PYTHIA and ISAJET. Our study, based on event shape variables, visible and missing momenta, and analysis of dilepton events, demonstrates that supersymmetry and black hole events at the LHC can be easily discriminated.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:22:10 GMT" } ]
2008-12-18T00:00:00
[ [ "Roy", "Arunava", "" ], [ "Cavaglia", "Marco", "" ] ]
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801.3282
Abilio Mateus
Abilio Mateus (1,2), Raul Jimenez (1), Enrique Gaztanaga (1) ((1) ICE, Barcelona, Spain; (2) LAM, Marseille, France)
The scale dependence of mass assembly in galaxies
4 pages, 4 figures, final version accepted for publication in ApJ Letters
null
10.1086/591732
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compare the results of the mark correlation analysis of galaxies in a sample from the Sloan Digital Sky Survey and from two galaxy catalogs obtained by semi-analytical galaxy formation models implemented on the Millennium Simulation. We use the MOPED method to retrieve the star formation history of observed galaxies and use star formation parameters as weights to the mark correlations. We find an excellent match between models and observations when the mark correlations use stellar mass and luminosity as weights. The most remarkable result is related to the mark correlations associated to the evolution of mass assembly through star formation in galaxies, where we find that semi-analytical models are able to reproduce the main trends seen in the observational data. In addition, we find a good agreement between the redshift evolution of the mean total mass formed by star formation predicted by the models and that measured by MOPED. Our results show that close galaxy pairs today formed more stellar mass ~10 Gyr ago than the average, while more recently this trend is the opposite, with close pairs showing low levels of star formation activity. We also show a strong correlation in simulations between the shape and time evolution of the star formation marks and the number of major mergers experienced by galaxies, which drive the environmental dependence in galaxy formation by regulating the star formation process.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:23:32 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 04:51:55 GMT" }, { "version": "v3", "created": "Thu, 10 Jul 2008 16:26:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Mateus", "Abilio", "" ], [ "Jimenez", "Raul", "" ], [ "Gaztanaga", "Enrique", "" ] ]
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801.3283
Hamid Hezari
Hamid Hezari
Inverse Spectral Problem for Schr\"odinger Operators
22 pages
null
10.1007/s00220-008-0718-8
null
math.SP
null
In this article we improve some of the inverse spectral results proved by Guillemin and Uribe in \cite{GU}. They proved that under some symmetry assumptions on the potential $V(x)$, the Taylor expansion of $V(x)$ near a non-degenerate global minimum can be recovered from the knowledge of the low-lying eigenvalues of the associated Schr\"odinger operator in $\mathbb R^n$. We prove some similar inverse spectral results using fewer symmetry assumptions. We also show that in dimension 1, no symmetry assumption is needed to recover the Taylor coefficients of $V(x)$. We establish our results by finding some explicit formulas for wave invariants at the bottom of the well.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:31:05 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 18:21:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Hezari", "Hamid", "" ] ]
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801.3284
Kenichi Konishi
Daniele Dorigoni, Kenichi Konishi, Keisuke Ohashi
Non-Abelian Vortices without Dynamical Abelianization
22 pages, 4 figures, One section (Section 2) added, and an extended discussion added in Section 5
Phys.Rev.D79:045011,2009
10.1103/PhysRevD.79.045011
IFUP-TH/2007-35, DAMTP-2008-4
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Vortices carrying truly non-Abelian flux moduli, which do not dynamically reduce to Abelian vortices, are found in the context of softly-broken ${\cal N}=2$ supersymmetric chromodynamics (SQCD). By tuning the bare quark masses appropriately we identify the vacuum in which the underlying SU(N) gauge group is partially broken to $SU(n) \times SU(r) \times U(1)/{\mathbbm Z}_{K}$, where $K$ is the least common multiple of $(n, r)$, and with $N_{f}^{su(n)}=n$ and $N_{f}^{su(r)}=r$ flavors of light quark multiplets. At much lower energies the gauge group is broken completely by the squark VEVs, and vortices develop which carry non-Abelian flux moduli $CP^{n-1}\times CP^{r-1}$. For $n>r$ we argue that the SU(n) fluctuations become strongly coupled and Abelianize, while leaving weakly fluctuating $SU(r)$ flux moduli. This allows us to recognize the semi-classical origin of the light non-Abelian monopoles found earlier in the fully quantum-mechanical treatment of 4D SQCD.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:35:44 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 15:20:49 GMT" } ]
2014-11-18T00:00:00
[ [ "Dorigoni", "Daniele", "" ], [ "Konishi", "Kenichi", "" ], [ "Ohashi", "Keisuke", "" ] ]
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801.3285
Debora Sijacki
D. Sijacki (1,2), C. Pfrommer (3), V. Springel (1), and T. A. Ensslin (1) ((1) MPA Garching, (2) IoA Cambridge, (3) CITA Toronto)
Simulations of cosmic ray feedback by AGN in galaxy clusters
15 pages, 7 figures, minor revisions, MNRAS accepted
null
10.1111/j.1365-2966.2008.13310.x
null
astro-ph
null
We investigate a numerical model for AGN feedback where for the first time a relativistic particle population in AGN-inflated bubbles is followed within a full cosmological context. In our high-resolution simulations of galaxy cluster formation, we assume that BH accretion is accompanied by energy feedback that occurs in two different modes, depending on the accretion rate itself. Unlike in previous work, we inject a non-thermal particle population of relativistic protons into the AGN bubbles, instead of adopting a purely thermal heating. We then follow the subsequent evolution of the cosmic ray (CR) plasma inside the bubbles, considering both its hydrodynamical interactions and dissipation processes relevant for the CR population. Due to the different buoyancy of relativistic plasma and the comparatively long CR dissipation timescale we find substantial changes in the evolution of clusters as a result of CR feedback. In particular, the non-thermal population can provide significant pressure support in central cluster regions at low thermal temperatures, providing a natural explanation for the decreasing temperature profiles found in cool core clusters. At the same time, the morphologies of the bubbles and of the induced X-ray cavities show a striking similarity to observational findings. AGN feedback with CRs also proves efficient in regulating cluster cooling flows so that the total baryon fraction in stars becomes limited to realistic values of the order of 10%. We find that the partial CR support of the intracluster gas also affects the expected signal of the thermal Sunyaev-Zel'dovich effect, with typical modifications of the integrated Compton-y parameter within the virial radius of the order of 10%. [Abridged]
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:44:05 GMT" }, { "version": "v2", "created": "Wed, 28 May 2008 14:51:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Sijacki", "D.", "", "MPA Garching", "IoA Cambridge" ], [ "Pfrommer", "C.", "", "CITA Toronto" ], [ "Springel", "V.", "", "MPA Garching" ], [ "Ensslin", "T. A.", "", "MPA Garching" ] ]
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801.3286
Ariyeh Maller
Ariyeh H. Maller, Andreas A. Berlind, Michael R. Blanton and David W. Hogg
The Intrinsic Properties of SDSS Galaxies
11 pages, 12 figures submitted to ApJ
Astrophys.J.691:394-406,2009
10.1088/0004-637X/691/1/394
null
astro-ph
null
The observed properties of galaxies vary with inclination; for most applications we would rather have properties that are independent of inclination, intrinsic properties. One way to determine inclination corrections is to consider a large sample of galaxies, study how the observed properties of these galaxies depend on inclination and then remove this dependence to recover the intrinsic properties. We perform such an analysis for galaxies selected from the Sloan Digital Sky Survey which have been matched to galaxies from the Two-Micron All Sky Survey. We determine inclination corrections for these galaxies as a function of galaxy luminosity and Sersic index. In the g-band these corrections reach as as high as 1.2 mag and have a median value of 0.3 mag for all galaxies in our sample. We find that the corrections show little dependence on galaxy luminosity, except in the $u$ band, but are strongly dependent on galaxy Sersic index. We find that the ratio of red-to-blue galaxies changes from 1:1 to 1:2 when going from observed to intrinsic colors for galaxies in the range -22.75 < M_K < -17.75. We also discuss how survey completeness and photometric redshifts should be determined when taking into account that observed and intrinsic properties differ. Finally, we examine whether previous determinations of stellar mass give an intrinsic quantity or one that depends on galaxy inclination.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 21:55:43 GMT" } ]
2009-06-23T00:00:00
[ [ "Maller", "Ariyeh H.", "" ], [ "Berlind", "Andreas A.", "" ], [ "Blanton", "Michael R.", "" ], [ "Hogg", "David W.", "" ] ]
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801.3287
Holger Weyer
Martin Reuter and Holger Weyer
Background Independence and Asymptotic Safety in Conformally Reduced Gravity
4 figures,
Phys.Rev.D79:105005,2009
10.1103/PhysRevD.79.105005
MZ-TH/08-04
hep-th gr-qc
null
We analyze the conceptual role of background independence in the application of the effective average action to quantum gravity. Insisting on a background independent renormalization group (RG) flow the coarse graining operation must be defined in terms of an unspecified variable metric since no rigid metric of a fixed background spacetime is available. This leads to an extra field dependence in the functional RG equation and a significantly different RG flow in comparison to the standard flow equation with a rigid metric in the mode cutoff. The background independent RG flow can possess a non-Gaussian fixed point, for instance, even though the corresponding standard one does not. We demonstrate the importance of this universal, essentially kinematical effect by computing the RG flow of Quantum Einstein Gravity in the ``conformally reduced'' Einstein--Hilbert approximation which discards all degrees of freedom contained in the metric except the conformal one. Without the extra field dependence the resulting RG flow is that of a simple $\phi^4$-theory. Including it one obtains a flow with exactly the same qualitative properties as in the full Einstein--Hilbert truncation. In particular it possesses the non-Gaussian fixed point which is necessary for asymptotic safety.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 22:01:52 GMT" } ]
2009-10-29T00:00:00
[ [ "Reuter", "Martin", "" ], [ "Weyer", "Holger", "" ] ]
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801.3288
Jan-Uwe Ness
J.U-. Ness, G. Schwarz, S. Starrfield, J.P. Osborne, K.L. Page, A.P. Beardmore, R.M. Wagner, C.E. Woodward
V723 Cassiopeia still on in X-rays: A bright Super Soft Source 12 years after outburst
Accepted by AJ; 7 pages, 5 figures, 2 tables
null
null
null
astro-ph
null
We find that the classical nova V723 Cas (1995) is still an active X-ray source more than 12 years after outburst and analyze seven X-ray observations carried out with Swift between 2006 January 31 and 2007 December 3. The average count rate is 0.022+/-0.01 cts s^-1 but the source is variable within a factor of two of the mean and does not show any signs of turning off. We present supporting optical observations which show that between 2001 and 2006 an underlying hot source was present with steadily increasing temperature. In order to confirm that the X-ray emission is from V723 Cas, we extract a ROSAT observation taken in 1990 and find that there was no X-ray source at the position of the nova. The Swift XRT spectra resemble those of the Super Soft X-ray binary Sources (SSS) which is confirmed by RXTE survey data which show no X-ray emission above 2 keV between 1996 and 2007. Using blackbody fits we constrain the effective temperature to between T_eff=(2.8-3.8)x10^5 K and a bolometric luminosity >5x10^36 erg s^-1 and caution that luminosities from blackbodies are generally overestimated and temperatures underestimated. We discuss a number of possible explanations for the continuing X-ray activity, including the intriguing possibility of steady hydrogen burning due to renewed accretion.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 22:42:55 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 16:52:57 GMT" } ]
2008-02-05T00:00:00
[ [ "Ness", "J. U-.", "" ], [ "Schwarz", "G.", "" ], [ "Starrfield", "S.", "" ], [ "Osborne", "J. P.", "" ], [ "Page", "K. L.", "" ], [ "Beardmore", "A. P.", "" ], [ "Wagner", "R. M.", "" ], [ "Woodward", "C. E.", "" ] ]
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801.3289
Lifeng Lai
Lifeng Lai, Hesham El Gamal, Hai Jiang and H. Vincent Poor
Optimal Medium Access Control in Cognitive Radios: A Sequential Design Approach
To appear in the Proceedings of the 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March 30- April 4, 2008
null
10.1109/ICASSP.2008.4518049
null
cs.IT cs.NI math.IT
null
The design of medium access control protocols for a cognitive user wishing to opportunistically exploit frequency bands within parts of the radio spectrum having multiple bands is considered. In the scenario under consideration, the availability probability of each channel is unknown a priori to the cognitive user. Hence efficient medium access strategies must strike a balance between exploring the availability of channels and exploiting the opportunities identified thus far. Using a sequential design approach, an optimal medium access strategy is derived. To avoid the prohibitive computational complexity of this optimal strategy, a low complexity asymptotically optimal strategy is also developed. The proposed strategy does not require any prior statistical knowledge about the traffic pattern on the different channels.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 22:45:28 GMT" } ]
2016-11-17T00:00:00
[ [ "Lai", "Lifeng", "" ], [ "Gamal", "Hesham El", "" ], [ "Jiang", "Hai", "" ], [ "Poor", "H. Vincent", "" ] ]
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801.329
Todd Kaplan
Todd D. Kaplan and Stephanie Forrest
A dual assortative measure of community structure
null
null
null
null
physics.data-an physics.soc-ph
null
Current community detection algorithms operate by optimizing a statistic called modularity, which analyzes the distribution of positively weighted edges in a network. Modularity does not account for negatively weighted edges. This paper introduces a dual assortative modularity measure (DAMM) that incorporates both positively and negatively weighted edges. We describe the the DAMM statistic and illustrate its utility in a community detection algorithm. We evaluate the efficacy of the algorithm on both computer generated and real-world networks, showing that DAMM broadens the domain of networks that can be analyzed by community detection algorithms.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 22:53:32 GMT" } ]
2008-01-23T00:00:00
[ [ "Kaplan", "Todd D.", "" ], [ "Forrest", "Stephanie", "" ] ]
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801.3291
Xiao-Gang Wen
Xiao-Gang Wen and Zhenghan Wang
A classification of symmetric polynomials of infinite variables -- a construction of Abelian and non-Abelian quantum Hall states
21 pages, RevTeX4
Phys. Rev. B 77, 235108 (2008)
10.1103/PhysRevB.77.235108
null
cond-mat.str-el cond-mat.mes-hall math-ph math.MP
null
Classification of complex wave functions of infinite variables is an important problem since it is related to the classification of possible quantum states of matter. In this paper, we propose a way to classify symmetric polynomials of infinite variables using the pattern of zeros of the polynomials. Such a classification leads to a construction of a class of simple non-Abelian quantum Hall states which are closely related to parafermion conformal field theories.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 23:21:15 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 22:56:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Wen", "Xiao-Gang", "" ], [ "Wang", "Zhenghan", "" ] ]
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801.3292
Alexander Hariton
A. M. Grundland, A. J. Hariton
Supersymmetric version of a hydrodynamic system in Riemann invariants and its solutions
30 pages
J.Math.Phys.49:043502,2008
10.1063/1.2898094
null
math-ph math.MP
null
In this paper, a supersymmetric extension of a system of hydrodynamic type equations involving Riemann invariants is formulated in terms of a superspace and superfield formalism. The symmetry properties of both the classical and supersymmetric versions of this hydrodynamical model are analyzed through the use of group-theoretical methods applied to partial differential equations involving both bosonic and fermionic variables. More specifically, we compute the Lie superalgebras of both models and perform classifications of their respective subalgebras. A systematic use of the subalgebra structures allow us to construct several classes of invariant solutions, including travelling waves, centered waves and solutions involving monomials, exponentials and radicals.
[ { "version": "v1", "created": "Mon, 21 Jan 2008 23:21:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Grundland", "A. M.", "" ], [ "Hariton", "A. J.", "" ] ]
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801.3293
Daniel Price
Daniel Price (U. Exeter), Matthew Bate (U. Exeter)
The effect of magnetic fields on star cluster formation
16 pages, 9 figures, 8 very pretty movies, MNRAS, accepted. Version with high-res figures + movies available from http://www.astro.ex.ac.uk/people/dprice/pubs/mcluster/index.html
null
10.1111/j.1365-2966.2008.12976.x
null
astro-ph
null
We examine the effect of magnetic fields on star cluster formation by performing simulations following the self-gravitating collapse of a turbulent molecular cloud to form stars in ideal MHD. The collapse of the cloud is computed for global mass-to-flux ratios of infinity, 20, 10, 5 and 3, that is using both weak and strong magnetic fields. Whilst even at very low strengths the magnetic field is able to significantly influence the star formation process, for magnetic fields with plasma beta < 1 the results are substantially different to the hydrodynamic case. In these cases we find large-scale magnetically-supported voids imprinted in the cloud structure; anisotropic turbulent motions and column density structure aligned with the magnetic field lines, both of which have recently been observed in the Taurus molecular cloud. We also find strongly suppressed accretion in the magnetised runs, leading to up to a 75% reduction in the amount of mass converted into stars over the course of the calculations and a more quiescent mode of star formation. There is also some indication that the relative formation efficiency of brown dwarfs is lower in the strongly magnetised runs due to the reduction in the importance of protostellar ejections.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 00:08:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Price", "Daniel", "", "U. Exeter" ], [ "Bate", "Matthew", "", "U. Exeter" ] ]
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801.3294
Ian F. Putnam
Ian F. Putnam
A homology theory for Smale spaces: a summary
Research summary; complete version in preparation. The new version gives a substantially simplified and more natural definition
null
null
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider Smale spaces, a particular class of hyperbolic topological dynamical systems, which include the basic sets for Smale's Axiom A systems. We present a homology theory for such systems which is based on the dimension group in the special case of shifts of finite type. This theory provides a Lefschetz formula relating trace data with the number of periodic points of the system.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 00:46:52 GMT" }, { "version": "v2", "created": "Thu, 20 Nov 2008 00:05:46 GMT" } ]
2008-11-20T00:00:00
[ [ "Putnam", "Ian F.", "" ] ]
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801.3295
Eugene Lim
Xingang Chen, Richard Easther, Eugene A. Lim
Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
29 pp, 8 figs
JCAP 0804:010,2008
10.1088/1475-7516/2008/04/010
null
astro-ph hep-th
null
Inflation driven by a single, minimally coupled, slowly rolling field generically yields a negligible primordial non-Gaussianity. We discuss two distinct mechanisms by which a non-trivial potential can generate large non-Gaussianities. Firstly, if the inflaton traverses a feature in the potential, or if the inflationary phase is short enough so that initial transient contributions to the background dynamics have not been erased, modes near horizon-crossing can acquire significant non-Gaussianities. Secondly, potentials with small-scale structure may induce significant non-Gaussianities while the relevant modes are deep inside the horizon. The first case includes the "step" potential we previously analyzed while the second "resonance" case is novel. We derive analytic approximations for the 3-point terms generated by both mechanisms written as products of functions of the three individual momenta, permitting the use of efficient analysis algorithms. Finally, we present a significantly improved approach to regularizing and numerically evaluating the integrals that contribute to the 3-point function.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 01:13:52 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 20:13:38 GMT" } ]
2009-06-23T00:00:00
[ [ "Chen", "Xingang", "" ], [ "Easther", "Richard", "" ], [ "Lim", "Eugene A.", "" ] ]
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801.3296
Nitu Kitchloo
Ralph L. Cohen, Soren Galatius, Nitu Kitchloo
Universal moduli spaces of surfaces with flat connections and cobordism theory
22 pages
null
null
null
math.AT math.GT
null
Given a semisimple, compact, connected Lie group G with complexification G^c, we show there is a stable range in the homotopy type of the universal moduli space of flat connections on a principal G-bundle on a closed Riemann surface, and equivalently, the universal moduli space of semistable holomorphic G^c-bundles. The stable range depends on the genus of the surface. We then identify the homology of this moduli space in the stable range in terms of the homology of an explicit infinite loop space. Rationally this says that the stable cohomology of this moduli space is generated by the Mumford-Morita-Miller kappa-classes, and the ring of characteristic classes of principal G-bundles, H^*(BG). We then identify the homotopy type of the category of one-manifolds and surface cobordisms, each equipped with a flat G-bundle. We also explain how these results may be generalized to arbitrary compact connected Lie groups. Our methods combine the classical techniques of Atiyah and Bott, with the new techniques coming out of Madsen and Weiss's proof of Mumford's conjecture on the stable cohomology of the moduli space of Riemann surfaces.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 02:39:55 GMT" } ]
2008-01-23T00:00:00
[ [ "Cohen", "Ralph L.", "" ], [ "Galatius", "Soren", "" ], [ "Kitchloo", "Nitu", "" ] ]
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801.3297
Ben Dilday
Benjamin Dilday, R. Kessler, J. A. Frieman, J. Holtzman, J. Marriner, G. Miknaitis, R. C. Nichol, R. Romani, M. Sako, B. Bassett, A. Becker, D. Cinabro, F. DeJongh, D. L. Depoy, M. Doi, P. M. Garnavich, C. J. Hogan, S. Jha, K. Konishi, H. Lampeitl, J. L. Marshall, D. McGinnis, J. L. Prieto, A. G. Riess, M. W. Richmond, D. P. Schneider, M. Smith, N. Takanashi, K. Tokita, K. van der Heyden, N. Yasuda, C. Zheng, J. Barentine, H. Brewington, C. Choi, A. Crotts, J. Dembicky, M. Harvanek, M. Im, W. Ketzeback, S. J. Kleinman, J. Krzesi\'nski, D. C. Long, E. Malanushenko, V. Malanushenko, R. J. McMillan, A. Nitta, K. Pan, G. Saurage, S. A. Snedden, S. Watters, J. C. Wheeler, and D. York
A Measurement of the Rate of type-Ia Supernovae at Redshift $z\approx$ 0.1 from the First Season of the SDSS-II Supernova Survey
65 pages, 12 figures
Astrophys.J.682:262-282,2008
10.1086/587733
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a measurement of the rate of type Ia supernovae (SNe Ia) from the first of three seasons of data from the SDSS-II Supernova Survey. For this measurement, we include 17 SNe Ia at redshift $z\le0.12$. Assuming a flat cosmology with $\Omega_m = 0.3=1-\Omega_\Lambda$, we find a volumetric SN Ia rate of $[2.93^{+0.17}_{-0.04}({\rm systematic})^{+0.90}_{-0.71}({\rm statistical})] \times 10^{-5} {\rm SNe} {\rm Mpc}^{-3} h_{70}^3 {\rm year}^{-1}$, at a volume-weighted mean redshift of 0.09. This result is consistent with previous measurements of the SN Ia rate in a similar redshift range. The systematic errors are well controlled, resulting in the most precise measurement of the SN Ia rate in this redshift range. We use a maximum likelihood method to fit SN rate models to the SDSS-II Supernova Survey data in combination with other rate measurements, thereby constraining models for the redshift-evolution of the SN Ia rate. Fitting the combined data to a simple power-law evolution of the volumetric SN Ia rate, $r_V \propto (1+z)^{\beta}$, we obtain a value of $\beta = 1.5 \pm 0.6$, i.e. the SN Ia rate is determined to be an increasing function of redshift at the $\sim 2.5 \sigma$ level. Fitting the results to a model in which the volumetric SN rate, $r_V=A\rho(t)+B\dot \rho(t)$, where $\rho(t)$ is the stellar mass density and $\dot \rho(t)$ is the star formation rate, we find $A = (2.8 \pm 1.2) \times 10^{-14} \mathrm{SNe} \mathrm{M}_{\sun}^{-1} \mathrm{year}^{-1}$, $B = (9.3^{+3.4}_{-3.1})\times 10^{-4} \mathrm{SNe} \mathrm{M}_{\sun}^{-1}$.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 15:15:27 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 19:54:27 GMT" }, { "version": "v3", "created": "Mon, 21 Jul 2008 13:18:17 GMT" } ]
2010-11-05T00:00:00
[ [ "Dilday", "Benjamin", "" ], [ "Kessler", "R.", "" ], [ "Frieman", "J. A.", "" ], [ "Holtzman", "J.", "" ], [ "Marriner", "J.", "" ], [ "Miknaitis", "G.", "" ], [ "Nichol", "R. C.", "" ], [ "Romani", "R.", "" ], [ "Sako", "M.", "" ], [ "Bassett", "B.", "" ], [ "Becker", "A.", "" ], [ "Cinabro", "D.", "" ], [ "DeJongh", "F.", "" ], [ "Depoy", "D. L.", "" ], [ "Doi", "M.", "" ], [ "Garnavich", "P. M.", "" ], [ "Hogan", "C. J.", "" ], [ "Jha", "S.", "" ], [ "Konishi", "K.", "" ], [ "Lampeitl", "H.", "" ], [ "Marshall", "J. L.", "" ], [ "McGinnis", "D.", "" ], [ "Prieto", "J. L.", "" ], [ "Riess", "A. G.", "" ], [ "Richmond", "M. W.", "" ], [ "Schneider", "D. P.", "" ], [ "Smith", "M.", "" ], [ "Takanashi", "N.", "" ], [ "Tokita", "K.", "" ], [ "van der Heyden", "K.", "" ], [ "Yasuda", "N.", "" ], [ "Zheng", "C.", "" ], [ "Barentine", "J.", "" ], [ "Brewington", "H.", "" ], [ "Choi", "C.", "" ], [ "Crotts", "A.", "" ], [ "Dembicky", "J.", "" ], [ "Harvanek", "M.", "" ], [ "Im", "M.", "" ], [ "Ketzeback", "W.", "" ], [ "Kleinman", "S. J.", "" ], [ "Krzesiński", "J.", "" ], [ "Long", "D. C.", "" ], [ "Malanushenko", "E.", "" ], [ "Malanushenko", "V.", "" ], [ "McMillan", "R. J.", "" ], [ "Nitta", "A.", "" ], [ "Pan", "K.", "" ], [ "Saurage", "G.", "" ], [ "Snedden", "S. A.", "" ], [ "Watters", "S.", "" ], [ "Wheeler", "J. C.", "" ], [ "York", "D.", "" ] ]
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801.3298
Zhiming Wang
Zhiming Wang, Feng Xu, Chao Lu, He Zhang, Qingyu Xu, Jinan Zhu (Institute of Mechanical Engineering, Nanjing University of science and technology, Nanjing, China)
Electronic Conductivity Upturn of HOPG Contrast to Transport Properties of Polycrystal Graphite
11 pages 5 figures
null
null
null
cond-mat.mtrl-sci cond-mat.other
null
The transport properties of highly oriented pyrolitic graphite (HOPG) and polycrystal graphite have been studied. The electric conductivity of HOPG is several times larger than that of the polycrystal graphite. Along with the large magnetoresistances (MR), the polycrystal graphite show the accordant semiconductor-like character in a wide temperature (roughly range from 20K to 120K) under 0, 4, 8, 12 T applied magnetic field, while the magnetic-field-induced metal-semiconductor-like transition was only found in HOPG. The difference of transport properties originates from the Coulomb interaction quasipartical in HOPG graphite layers in contrast with the grain boundary scattering in the polycrystal graphite.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 02:20:37 GMT" } ]
2008-01-23T00:00:00
[ [ "Wang", "Zhiming", "", "Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China" ], [ "Xu", "Feng", "", "Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China" ], [ "Lu", "Chao", "", "Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China" ], [ "Zhang", "He", "", "Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China" ], [ "Xu", "Qingyu", "", "Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China" ], [ "Zhu", "Jinan", "", "Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China" ] ]
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801.3299
Stephen D. Miller
Stephen D. Miller
A method for computing general automorphic forms on general groups
v1:6 pages v2:updates to mention recent computational work by other researchers v3:7 pages, updates and adds some comments and references
null
null
null
math.NT math.SP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article describes a general method for computing automorphic forms using Voronoi-type summation formulas. It gives a numerical example where the technique is successful in quickly finding a cusp form on GL(3,Z)\GL(3,R), albeit one whose existence was already known as a Langlands lift.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 02:51:59 GMT" }, { "version": "v2", "created": "Wed, 4 Jun 2008 20:04:54 GMT" }, { "version": "v3", "created": "Thu, 23 Jul 2009 18:05:16 GMT" } ]
2009-07-23T00:00:00
[ [ "Miller", "Stephen D.", "" ] ]
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801.33
Sang Pyo Kim
Sang Pyo Kim (Kunsan Nat'l Univ.)
Strong Scalar QED in Inhomogeneous Electromagnetic Fields
RevTex 8 pages, no figure; to appear in the Proceedings of the 10th Italian-Korean Symposium on Relativistic Astrophysics, Pescara, Italy, June 25-30, 2007; pair production rate and mean number of pairs clarified in the strong electric field limit and references added
null
null
null
hep-th
null
Strong QED has attracted attention recently partly because many astrophysical phenomena have been observed to involve electromagnetic fields beyond the critical strength for electron-positron pair production and partly because terrestrial experiments will generate electromagnetic fields above or near the critical strength in the near future. In this talk we critically review QED phenomena involving strong external electromagnetic fields. Strong QED is characterized by vacuum polarization due to quantum fluctuations and pair production due to the vacuum instability. A canonical method is elaborated for pair production at zero or finite temperature by inhomogeneous electric fields. An algorithm is advanced to calculate pair production rate for electric fields acting for finite periods of time or localized in space or oscillating electric fields. Finally, strong QED is discussed in astrophysics, in particular, strange stars.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 02:54:34 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 18:01:55 GMT" } ]
2008-02-06T00:00:00
[ [ "Kim", "Sang Pyo", "", "Kunsan Nat'l Univ." ] ]
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801.3301
Yoshio Koide
Naoyuki Haba and Yoshio Koide
F-term Induced Flavor Mass Spectrum
12 pages, no figure
JHEP 0806:023,2008
10.1088/1126-6708/2008/06/023
OU-HET 596/2008
hep-ph
null
New mechanism of generating flavor mass spectrum is proposed by using an O'Raifeartaigh-type supersymmetry breaking model. A desired bilinear form of fermion mass spectrum is naturally realized through F-components of gauge-singlet (nonet of SU(3) flavor symmetry) superfields, and the suitable charged-lepton mass relation is reproduced. The charged-slepton mass spectrum is non-degenerate in general, and can be even hierarchical (proportional to the charged-lepton masses in the specific case). Flavor changing neutral processes are suppressed since the charged-lepton and slepton (except for right-handed sneutrino) mass matrices are diagonalized simultaneously in the flavor space. The right-handed sneutrinos are light with the similar ratio to the lepton sector ($\tilde{m}_{\nu_R}$/$\tilde{m}_e \sim m_\nu$/$m_e$).
[ { "version": "v1", "created": "Tue, 22 Jan 2008 05:07:17 GMT" } ]
2009-01-06T00:00:00
[ [ "Haba", "Naoyuki", "" ], [ "Koide", "Yoshio", "" ] ]
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801.3302
Farhan Rana
Jahan M. Dawlaty, Shriram Shivaraman, Jared Strait, Paul George, Mvs Chandrashekhar, Farhan Rana, Michael G. Spencer, Dmitry Veksler, Yunqing Chen
Measurement of the Optical Absorption Spectra of Epitaxial Graphene from Terahertz to Visible
null
null
10.1063/1.2990753
null
cond-mat.mtrl-sci cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present experimental results on the optical absorption spectra of epitaxial graphene from the visible to the terahertz (THz) frequency range. In the THz range, the absorption is dominated by intraband processes with a frequency dependence similar to the Drude model. In the near IR range, the absorption is due to interband processes and the measured optical conductivity is close to the theoretical value of $e^{2}/4\hbar$. We extract values for the carrier densities, the number of carbon atom layers, and the intraband scattering times from the measurements.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 20:35:54 GMT" }, { "version": "v2", "created": "Sun, 27 Jan 2008 05:18:07 GMT" }, { "version": "v3", "created": "Sat, 16 Aug 2008 11:43:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Dawlaty", "Jahan M.", "" ], [ "Shivaraman", "Shriram", "" ], [ "Strait", "Jared", "" ], [ "George", "Paul", "" ], [ "Chandrashekhar", "Mvs", "" ], [ "Rana", "Farhan", "" ], [ "Spencer", "Michael G.", "" ], [ "Veksler", "Dmitry", "" ], [ "Chen", "Yunqing", "" ] ]
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801.3303
Yanfei Jiang
Yu-Qing Lou, Yan-Fei Jiang, Chi-Chuan Jin
Self-Similar Shocks and Winds in Galaxy Clusters
26 pages, 20 figures
null
10.1111/j.1365-2966.2008.12999.x
null
astro-ph
null
A theoretical model framework of spherical symmetry is presented for a composite astrophysical system of two polytropic fluids coupled together by gravity to explore large-scale shocks and flow dynamics in clusters of galaxies or in globular clusters. The existence of such large-scale shocks in clusters of galaxies as inferred by high-resolution X-ray and radio imaging observations implies large-scale systematic flows that are beyond usual static models for clusters of galaxies. Here, we explore self-similar two-fluid flow solutions with shocks for a hot polytropic gas flow in a cluster of galaxies in the presence of a massive dark matter (DM) flow after the initiation of a gravitational core collapse or a central AGN activity or a large-scale merging process. In particular, the possibility of DM shocks or sharp jumps of mass density and of velocity dispersion in dark matter halo is discussed and such DM shocks might be detectable through gravitational lensing effects. To examine various plausible scenarios for clusters of galaxies, we describe three possible classes of shock flows within our model framework for different types of temperature, density and flow speed profiles. Depending upon sensible model parameters and shock locations, the hot ICM and DM halo may have various combinations of asymptotic behaviours of outflow, breeze, inflow, contraction or static envelopes at large radii at a given time. We refer to asymptotic outflows of hot ICM at large radii as the galaxy cluster wind. As a result of such galaxy cluster winds and simultaneous contractions of DM halo during the course of galaxy cluster evolution, there would be less hot ICM within clusters of galaxies as compared to the average baryon fraction in the Universe.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 04:23:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Lou", "Yu-Qing", "" ], [ "Jiang", "Yan-Fei", "" ], [ "Jin", "Chi-Chuan", "" ] ]
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801.3304
Rebecca McFadden
R. A. McFadden, N. D. R. Bhat, R. D. Ekers, C. W. James, D. Jones, S. J. Tingay, P. P. Roberts, C. J. Phillips, R. J. Protheroe
Developments in Nanosecond Pulse Detection Methods and Technology
4 pages, 1 figure, Proceedings from 30th ICRC, Merida, Mexico, 2007
null
null
null
astro-ph
null
A promising method for the detection of UHE neutrinos is the Lunar Cherenkov technique, which utilises Earth-based radio telescopes to detect the coherent Cherenkov radiation emitted when a UHE neutrino interacts in the outer layers of the Moon. The LUNASKA project aims to overcome the technological limitations of past experiments to utilise the next generation of radio telescopes in the search for these elusive particles. To take advantage of broad-bandwidth data from potentially thousands of antennas requires advances in signal processing technology. Here we describe recent developments in this field and their application in the search for UHE neutrinos, from a preliminary experiment using the first stage of an upgrade to the Australia Telescope Compact Array, to possibilities for fully utilising the completed Square Kilometre Array. We also explore a new real time technique for characterising ionospheric pulse dispersion which specifically measures ionospheric electron content that is line of sight to the moon.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 04:24:19 GMT" } ]
2008-01-23T00:00:00
[ [ "McFadden", "R. A.", "" ], [ "Bhat", "N. D. R.", "" ], [ "Ekers", "R. D.", "" ], [ "James", "C. W.", "" ], [ "Jones", "D.", "" ], [ "Tingay", "S. J.", "" ], [ "Roberts", "P. P.", "" ], [ "Phillips", "C. J.", "" ], [ "Protheroe", "R. J.", "" ] ]
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801.3305
Masahiro Machida N
Masahiro N. Machida, Eiichiro Kokubo, Shu-ichiro Inutsuka, Tomoaki Matsumoto
Angular Momentum Accretion onto a Gas Giant Planet
39 pages,13 figures, Submitted to ApJ, For high resolution figures see http://www2.scphys.kyoto-u.ac.jp/~machidam/jupiter2/ms08jan22.pdf
null
10.1086/590421
null
astro-ph
null
We investigate the accretion of angular momentum onto a protoplanet system using three-dimensional hydrodynamical simulations. We consider a local region around a protoplanet in a protoplanetary disk with sufficient spatial resolution. We describe the structure of the gas flow onto and around the protoplanet in detail. We find that the gas flows onto the protoplanet system in the vertical direction crossing the shock front near the Hill radius of the protoplanet, which is qualitatively different from the picture established by two-dimensional simulations. The specific angular momentum of the gas accreted by the protoplanet system increases with the protoplanet mass. At Jovian orbit, when the protoplanet mass M_p is M_p < 1 M_J, where M_J is Jovian mass, the specific angular momentum increases as j \propto M_p. On the other hand, it increases as j \propto M_p^2/3 when the protoplanet mass is M_p > 1 M_J. The stronger dependence of the specific angular momentum on the protoplanet mass for M_p < 1 M_J is due to thermal pressure of the gas. The estimated total angular momentum of a system of a gas giant planet and a circumplanetary disk is two-orders of magnitude larger than those of the present gas giant planets in the solar system. A large fraction of the total angular momentum contributes to the formation of the circumplanetary disk. We also discuss the satellite formation from the circumplanetary disk.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 04:24:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Machida", "Masahiro N.", "" ], [ "Kokubo", "Eiichiro", "" ], [ "Inutsuka", "Shu-ichiro", "" ], [ "Matsumoto", "Tomoaki", "" ] ]
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801.3306
Lionel Levine
Alexander E. Holroyd, Lionel Levine, Karola Meszaros, Yuval Peres, James Propp, David B. Wilson
Chip-Firing and Rotor-Routing on Directed Graphs
34 pages, 11 figures. v2 has additional references, v3 corrects figure 9, v4 corrects several typos
In and Out of Equilibrium 2, "Progress in Probability'' vol. 60, pages 331--364 (2008)
10.1007/978-3-7643-8786-0_17
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a rigorous and self-contained survey of the abelian sandpile model and rotor-router model on finite directed graphs, highlighting the connections between them. We present several intriguing open problems.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 18:08:35 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 23:19:42 GMT" }, { "version": "v3", "created": "Fri, 18 Apr 2008 13:23:44 GMT" }, { "version": "v4", "created": "Thu, 20 Jun 2013 13:11:54 GMT" } ]
2015-03-13T00:00:00
[ [ "Holroyd", "Alexander E.", "" ], [ "Levine", "Lionel", "" ], [ "Meszaros", "Karola", "" ], [ "Peres", "Yuval", "" ], [ "Propp", "James", "" ], [ "Wilson", "David B.", "" ] ]
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801.3307
Shunji Tsuchiya
Shunji Tsuchiya, Franco Dalfovo, Lev P. Pitaevskii
Solitons in two-dimensional Bose-Einstein condensates
4 pages, 4 figures, published version
Phys. Rev. A 77, 045601 (2008)
10.1103/PhysRevA.77.045601
null
cond-mat.supr-con cond-mat.other
null
The excitations of a two-dimensional (2D) Bose-Einstein condensate in the presence of a soliton are studied by solving the Kadomtsev-Petviashvili equation which is valid when the velocity of the soliton approaches the speed of sound. The excitation spectrum is found to contain states which are localized near the soliton and have a dispersion law similar to the one of the stable branch of transverse oscillations of a 1D gray soliton in a 2D condensate. By using the stabilization method we show that these localized excitations behave as resonant states coupled to the continuum of free excitations of the condensate.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 05:15:06 GMT" }, { "version": "v2", "created": "Fri, 14 Mar 2008 05:03:01 GMT" }, { "version": "v3", "created": "Fri, 4 Apr 2008 07:52:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Tsuchiya", "Shunji", "" ], [ "Dalfovo", "Franco", "" ], [ "Pitaevskii", "Lev P.", "" ] ]
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801.3308
Alok Shukla
Priya Sony and Alok Shukla
Ab initio Wannier-function-based correlated calculations of Born effective charges of crystalline Li$_{2}$O and LiCl
11 pages, 1 figure. To appear in Phys. Rev. B (Feb 2008)
Phys. Rev. B 77, 075130 (2008).
10.1103/PhysRevB.77.075130
null
cond-mat.mtrl-sci
null
In this paper we have used our recently developed ab initio Wannier-function-based methodology to perform extensive Hartree-Fock and correlated calculations on Li$_{2}$O and LiCl to compute their Born effective charges. Results thus obtained are in very good agreement with the experiments. In particular, for the case of Li$_{2}$O, we resolve a controversy originating in the experiment of Osaka and Shindo {[}Solid State Commun. 51 (1984) 421] who had predicted the effective charge of Li ions to be in the range 0.58--0.61, a value much smaller compared to its nominal value of unity, thereby, suggesting that the bonding in the material could be partially covalent. We demonstrate that effective charge computed by Osaka and Shindo is the Szigeti charge, and once the Born charge is computed, it is in excellent agreement with our computed value. Mulliken population analysis of Li$_{2}$O also confirms ionic nature of the bonding in the substance.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 05:56:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Sony", "Priya", "" ], [ "Shukla", "Alok", "" ] ]
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801.3309
Li Yu
Yu Guo, Li Yu
Surgery on links with unknotted components and three-manifolds
10 pages, 8 figures
Journal of Knot Theory and Its Ramifications, Vol. 19, No. 12 (2010) 1645--1653
null
null
math.GT
null
It is shown that any closed three-manifold M obtained by integral surgery on a knot in the three-sphere can always be constructed from integral surgeries on a 3-component link L with each component being an unknot in the three-sphere. It is also interesting to notice that infinitely many different integral surgeries on the same link L could give the same three-manifold M.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 06:00:11 GMT" } ]
2011-01-25T00:00:00
[ [ "Guo", "Yu", "" ], [ "Yu", "Li", "" ] ]
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801.331
Tatiana Hessami Pilehrood
Kh. Hessami Pilehrood, T. Hessami Pilehrood
Simultaneous generation for zeta values by the Markov-WZ method
7 pages
Discrete Math. Theor. Comput. Sci. 10 (2008), no. 3, 115-123
null
null
math.CO math.NT
null
By application of the Markov-WZ method, we prove a more general form of a bivariate generating function identity containing, as particular cases, Koecher's and Almkvist-Granville's Ap\'ery-like formulae for odd zeta values. As a consequence, we get a new identity producing Ap\'ery-like series for all $\zeta(2n+4m+3),$ $n,m\ge 0,$ convergent at the geometric rate with ratio $2^{-10}.$
[ { "version": "v1", "created": "Tue, 22 Jan 2008 06:10:44 GMT" } ]
2013-12-31T00:00:00
[ [ "Pilehrood", "Kh. Hessami", "" ], [ "Pilehrood", "T. Hessami", "" ] ]
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801.3311
Alex T. Granik
Alex Granik
Straightforward Derivation of the Schr{\"o}dinger Equation from Classical Mechanics and the Planck Postulate
18 pages, 2 appendices, the title is changed, introduction and conclusions are revised for making more clear the purpose and the results of the paper
null
null
null
quant-ph
null
According to the widely accepted notion, the Schr{\"o}dinger equation (SE) is not derivable in principle. Contrary to this belief, we present here a straightforward derivation of SE. It is based on only two fundamentals of mechanics: the classical Hamilton-Jacobi equation(HJE) and the Planck postulate about the discrete transfer of energy at micro-scales. Our approach is drastically different from the other published derivations of SE which either employ an ad hoc underlying assumption about the probabilistic or the statistical nature of the micro-scale phenomena, or rely on the prior knowledge of SE and arrive at it by introducing a new postulate - neither present in classical mechanics nor following from experiments - with a suitable but physically unjustifiable choice of a key arbitrary constant.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 06:48:27 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 09:19:41 GMT" }, { "version": "v3", "created": "Wed, 16 Apr 2008 06:33:00 GMT" } ]
2008-04-16T00:00:00
[ [ "Granik", "Alex", "" ] ]
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801.3312
Cory Dean
C.R. Dean, B.A. Piot, P. Hayden, S. Das Sarma, G. Gervais, L.N. Pfeiffer, and K.W. West
Intrinsic Gap of the nu=5/2 Fractional Quantum Hall State
5 pages, 4 figures; typo corrected, comment expanded
Phys. Rev. Lett. 100, 146803 (2008)
10.1103/PhysRevLett.100.146803
null
cond-mat.mes-hall
null
The fractional quantum Hall effect is observed at low field, in a regime where the cyclotron energy is smaller than the Coulomb interaction. The nu=5/2 excitation gap is measured to be 262+/-15 mK at ~2.6 T, in good agreement with previous measurements performed on samples with similar mobility, but with electronic density larger by a factor of two. The role of disorder on the nu=5/2 gap is examined. Comparison between experiment and theory indicates that a large discrepancy remains for the intrinsic gap extrapolated from the infinite mobility (zero disorder) limit. In contrast, no such large discrepancy is found for the nu=1/3 Laughlin state. The observation of the nu=5/2 state in the low-field regime implies that inclusion of non-perturbative Landau level mixing may be necessary to better understand the energetics of half-filled fractional quantum hall liquids.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 06:54:48 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 18:53:11 GMT" } ]
2008-04-10T00:00:00
[ [ "Dean", "C. R.", "" ], [ "Piot", "B. A.", "" ], [ "Hayden", "P.", "" ], [ "Sarma", "S. Das", "" ], [ "Gervais", "G.", "" ], [ "Pfeiffer", "L. N.", "" ], [ "West", "K. W.", "" ] ]
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801.3313
Yuliang Yan
Yu-Liang Yan, Bao-Guo Dong, Dai-Mei Zhou, Xiao-Mei Li, Hai-Liang Ma, Ben-Hao Sa
Parton rescattering effect on the charged hadron forward-backward multiplicity correlation in $pp$ collisions at $\sqrt s$=200 GeV
5 pages, 3 figures
null
null
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The parton rescattering effect on the charged hadron forward-backward multiplicity correlation in $pp$ collisions at $\sqrt s$=200 GeV is studied by a parton and hadron cascade model, PACIAE, based on the PYTHIA model. The calculated multiplicity and pseudorapidity distribution of the final state charged hadron are well compared with experimental data. It turned out that the final state charged hadron pseudorapidity distribution are different from the initial state charged partons. The parton rescattering effect on the charged hadron forward-backward multiplicity correlation increases with increasing parton rescattering strength in the center pseudorapidity region ($|\eta| <1$). However, this effect becomes weaker in the outer pseudorapidity region ($|\eta|> 1$).
[ { "version": "v1", "created": "Tue, 22 Jan 2008 07:04:57 GMT" }, { "version": "v2", "created": "Wed, 16 Dec 2009 06:16:16 GMT" } ]
2009-12-16T00:00:00
[ [ "Yan", "Yu-Liang", "" ], [ "Dong", "Bao-Guo", "" ], [ "Zhou", "Dai-Mei", "" ], [ "Li", "Xiao-Mei", "" ], [ "Ma", "Hai-Liang", "" ], [ "Sa", "Ben-Hao", "" ] ]
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801.3314
Ciprian Tudor
Khalifa Es-Sebaiy, David Nualart, Youssef Ouknine, Ciprian Tudor (CES, SAMOS)
Occupation densities for certain processes related to fractional Brownian motion
null
null
null
null
math.PR
null
In this paper we establish the existence of a square integrable occupation density for two classes of stochastic processes. First we consider a Gaussian process with an absolutely continuous random drift, and secondly we handle the case of a (Skorohod) integral with respect to the fractional Brownian motion with Hurst parameter $H>\frac 12$. The proof of these results uses a general criterion for the existence of a square integrable local time, which is based on the techniques of Malliavin calculus.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 07:09:18 GMT" } ]
2008-01-23T00:00:00
[ [ "Es-Sebaiy", "Khalifa", "", "CES,\n SAMOS" ], [ "Nualart", "David", "", "CES,\n SAMOS" ], [ "Ouknine", "Youssef", "", "CES,\n SAMOS" ], [ "Tudor", "Ciprian", "", "CES,\n SAMOS" ] ]
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801.3315
Hiromitsu Takahashi
Kazuo Makishima, Hiromitsu Takahashi, Shin'ya Yamada, Chris Done, Aya Kubota, Tadayasu Dotani, Ken Ebisawa, Takeshi Itoh, Shunji Kitamoto, Hitoshi Negoro, Yoshihiro Ueda and Kazutaka Yamaoka
Suzaku Results on Cygnus X-1 in the Low/Hard State
21 pages, 12 figures, accepted for Publications of the Astronomical Society of Japan
null
10.1093/pasj/60.3.585
null
astro-ph
null
The black-hole binary Cygnus X-1 was observed for 17 ks with the Suzaku X-ray observatory in 2005 October, while it was in a low/hard state with a 0.7-300 keV luminosity of 4.6 x 10^37 erg/s. The XIS and HXD spectra, spanning 0.7-400 keV, were reproduced successfully incorporating a cool accretion disk and a hot Comptonizing corona. The corona is characterized by an electron temperature of ~100 keV, and two optical depths of ~0.4 and ~1.5 which account for the harder and softer continua, respectively. The disk has the innermost temperature of ~0.2 keV, and is thought to protrude half way into the corona. The disk not only provides seed photons to the Compton cloud, but also produces a soft spectral excess, a mild reflection hump, and a weakly broadened iron line. A comparison with the Suzaku data on GRO J1655-40 reveals several interesting spectral differences, which can mostly be attributed to inclination effects assuming that the disk has a flat geometry while the corona is grossly spherical. An intensity-sorted spectroscopy indicates that the continuum becomes less Comptonized when the source flares up on times scales of 1-200 s, while the underlying disk remains unchanged.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 07:18:36 GMT" } ]
2015-05-13T00:00:00
[ [ "Makishima", "Kazuo", "" ], [ "Takahashi", "Hiromitsu", "" ], [ "Yamada", "Shin'ya", "" ], [ "Done", "Chris", "" ], [ "Kubota", "Aya", "" ], [ "Dotani", "Tadayasu", "" ], [ "Ebisawa", "Ken", "" ], [ "Itoh", "Takeshi", "" ], [ "Kitamoto", "Shunji", "" ], [ "Negoro", "Hitoshi", "" ], [ "Ueda", "Yoshihiro", "" ], [ "Yamaoka", "Kazutaka", "" ] ]
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801.3316
Zbigniew Koza
Maciej Matyka, Arzhang Khalili, Zbigniew Koza
Tortuosity-porosity relation in the porous media flow
null
Phys. Rev. E 78, 026306 (2008)
10.1103/PhysRevE.78.026306
null
physics.flu-dyn physics.comp-ph
null
We study numerically the tortuosity--porosity relation in a microscopic model of a porous medium arranged as a collectin of freely overlapping squares. It is demonstrated that the finite-size effects and the discretization errors, which were ignored in previous studies, may cause significant underestimation of tortuosity. The simple tortuosity calculation method proposed here eliminates the need for using complicated, weighted averages. The numerical results presented here are in good agreement with an empirical relation between tortuosity ($T$) and porosity ($\phi$) given by $T-1\propto \ln\phi$, that was found by others experimentally in granule packings and sediments. This relation can be also written as $T-1\propto R S/\phi$ with $R$ and $S$ denoting the hydraulic radius of granules and the specific surface area, respectively.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 12:21:45 GMT" } ]
2013-08-13T00:00:00
[ [ "Matyka", "Maciej", "" ], [ "Khalili", "Arzhang", "" ], [ "Koza", "Zbigniew", "" ] ]
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801.3317
Detlef Klimm
S. Ganschow, D. Klimm, P. Reiche, R. Uecker
On the Crystallization of Terbium Aluminium Garnet
6 pages, 2 figures
Crystal Research and Technology 34 (1999) 615-619
10.1002/(SICI)1521-4079(199906)34:5/6<615::AID-CRAT615>3.0.CO;2-C
null
cond-mat.mtrl-sci physics.chem-ph
null
Attempts to grow terbium aluminium garnet (Tb3Al5O12, TAG) by the Czochralski method lead to crystals of millimeter scale. Larger crystals could not be obtained. DTA measurements within the binary system showed that TAG melts incongruently at 1840 deg. C. The perovskite (TbAlO3, TAP) with a congruent melting point of 1930 deg. C is the most stable phase in this system. The region for primary crystallization of TAP covers the chemical composition of TAG and suppresses the primary crystallization of the terbium aluminium garnet.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 07:41:57 GMT" } ]
2008-01-23T00:00:00
[ [ "Ganschow", "S.", "" ], [ "Klimm", "D.", "" ], [ "Reiche", "P.", "" ], [ "Uecker", "R.", "" ] ]
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801.3318
Yoav Tsori
Yoav Tsori, David Andelman and Jean-Fran\c{c}ois Joanny
Interfacial Instability of Charged End-Group Polymer Brushes
6 pages, 3 figures
Europhys. Lett. 82, 46001 (2008)
10.1209/0295-5075/82/46001
null
cond-mat.soft
null
We consider a polymer brush grafted to a surface (acting as an electrode) and bearing a charged group at its free end. Using a second distant electrode, the brush is subject to a constant electric field. Based on a coarse-grained continuum model, we calculate the average brush height and find that the brush can stretch or compress depending on the applied field and charge end-group. We further look at an undulation mode of the flat polymer brush and find that the electrostatic energy scales linearly with the undulation wavenumber, $q$. Competition with surface tension, scaling as $q^2$, tends to stabilize a lateral $q$-mode of the polymer brush with a well-defined wavelength. This wavelength depends on the brush height, surface separation, and several system parameters.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 07:55:22 GMT" } ]
2012-01-31T00:00:00
[ [ "Tsori", "Yoav", "" ], [ "Andelman", "David", "" ], [ "Joanny", "Jean-François", "" ] ]
[ 0.0341378078, 0.0314045958, -0.0341924727, 0.1117883399, -0.0752726346, 0.0555388518, -0.0306666307, -0.0412988216, -0.0666356906, 0.0065938723, 0.0244485755, -0.0578894131, -0.0803017467, -0.0159619544, 0.0181621891, 0.0617705733, -0.0682209507, 0.0047694538, 0.0021421544, 0.0324432179, 0.0190368164, -0.0613332614, 0.0042569763, -0.0293820202, -0.0028374149, -0.0214147102, 0.0368983522, -0.0716101378, 0.0876814201, -0.0201164354, 0.0782245025, -0.0538715944, -0.0361877158, -0.1211359203, -0.0762019306, 0.0883920491, -0.0285073929, 0.0623172149, 0.0211140569, 0.0502090901, 0.0503457524, 0.0616065823, -0.1249624193, 0.0628638566, 0.0824336484, 0.0449613258, 0.0556208491, 0.0565774739, 0.031021947, -0.0295733456, 0.0073181731, 0.0859321654, 0.0384562835, -0.0642304644, -0.0737967044, -0.0597479977, 0.0280974116, 0.0344384611, -0.0787164867, 0.0012060294, 0.0569054596, -0.1484680325, 0.057944078, -0.0506190732, -0.0736327097, 0.0563588142, -0.1071418822, 0.0284253974, -0.0247628931, 0.0257605165, 0.0077076559, 0.0197064523, -0.0150053296, 0.0275917668, -0.018900156, -0.0834722742, -0.0506464057, -0.0678383037, -0.0152649852, 0.0962090343, 0.0481318496, -0.1227758527, -0.0828709677, -0.0945691094, -0.0213190485, -0.041162163, 0.0082884636, -0.0726487562, -0.153825134, -0.0356957391, -0.057780087, 0.070571512, -0.1252904087, 0.0716647953, 0.0622625537, -0.0139257116, 0.0659250543, 0.0322792232, 0.0418454632, -0.0243255794, 0.0248858891, 0.0436493829, 0.0205264166, -0.0156476349, 0.0983956084, 0.0168092493, -0.0351764299, 0.0028322903, -0.1508732587, 0.0395495668, 0.1920900941, 0.0670730025, -0.0731953979, 0.0148276715, 0.0510290526, -0.0904146284, -0.0158389583, -0.0065972889, -0.0507283993, -0.0034728865, -0.0789898038, 0.0475032106, 0.0669090077, -0.0168912448, 0.0741793513, -0.120042637, 0.0182988495, -0.0052409326, -0.1592915505, -0.0912345946, 0.0763659254, -0.052996967, -0.0124497777, -0.0409161709, -0.0230819695, -0.0520403422, 0.0808483884, 0.0248995554, 0.0875720903, 0.059201356, 0.0630278513, -0.0111924997, 0.0061428924, -0.0451526493, -0.0107620191, 0.0484325029, -0.0371170081, 0.007912647, -0.0033686829, -0.0315412581, 0.0505644083, -0.0797004402, -0.010987509, 0.0207177419, 0.0974116474, -0.1342553347, 0.0891026855, 0.1565583348, 0.0755459592, 0.0049163639, -0.0022087763, 0.0104135349, -0.0671823323, -0.0818323418, 0.082652308, 0.0396042317, 0.015825294, -0.0516303591, -0.0105501954, -0.1127176285, -0.0301199872, -0.0831989497, -0.1045179963, -0.0447426699, 0.0312132724, -0.0113769919, -0.0294093527, -0.0430207439, -0.0505370758, 0.0653784126, 0.1035340428, 0.0181758553, 0.0782245025, -0.0169322435, -0.0311039444, -0.0256648529, 0.0217563622, 0.0584360547, -0.0588733703, 0.0014827671, -0.0417634696, 0.0060984776, -0.033864487, -0.0760379359, 0.0063991309, -0.1245251074, 0.1386284679, 0.044851996, 0.0742886811, -0.0209090654, 0.0321425647, -0.0243392456, 0.0703528598, -0.0094364118, -0.1234318167, -0.0167819168, -0.0489244796, 0.0040212371, -0.0691502467, -0.132834062, 0.0664716959, 0.0011385533, 0.082324326, -0.0834722742, -0.0768032372, -0.0296280105, -0.0132424086, 0.0647224411, -0.0704075247, 0.063191846, 0.0146363461, 0.0672369972, 0.0508103967, 0.1167627871, -0.0408341773, 0.0507557318, 0.0126479352, -0.0699702054, 0.021688031, -0.0046054609, -0.0236559436, 0.0134815648, -0.0605132952, -0.0619892329, 0.034329135, -0.0185448378, -0.0164129343, 0.1227758527, 0.010987509, -0.0558121726, -0.0178068709, 0.0866427943, -0.0754912943, 0.0654877424, 0.0346844494, 0.0151146585, -0.0895399973, -0.0485418327, 0.068986252, -0.0710088313, -0.0225626584, -0.0136933886, 0.0234919507, 0.0877360776, 0.0238882657, 0.0090195974 ]
801.3319
Pierpaolo Brutti
Pierpaolo Brutti
Warped Wavelet and Vertical Thresholding
Submitted to the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
null
null
IMS-EJS-EJS_2008_175
math.ST stat.TH
null
Let $\{(X_i,Y_i)\}_{i\in \{1,..., n\}}$ be an i.i.d. sample from the random design regression model $Y=f(X)+\epsilon$ with $(X,Y)\in [0,1]\times [-M,M]$. In dealing with such a model, adaptation is naturally to be intended in terms of $L^2([0,1],G_X)$ norm where $G_X(\cdot)$ denotes the (known) marginal distribution of the design variable $X$. Recently much work has been devoted to the construction of estimators that adapts in this setting (see, for example, [5,24,25,32]), but only a few of them come along with a easy--to--implement computational scheme. Here we propose a family of estimators based on the warped wavelet basis recently introduced by Picard and Kerkyacharian [36] and a tree-like thresholding rule that takes into account the hierarchical (across-scale) structure of the wavelet coefficients. We show that, if the regression function belongs to a certain class of approximation spaces defined in terms of $G_X(\cdot)$, then our procedure is adaptive and converge to the true regression function with an optimal rate. The results are stated in terms of excess probabilities as in [19].
[ { "version": "v1", "created": "Tue, 22 Jan 2008 07:56:26 GMT" } ]
2008-01-23T00:00:00
[ [ "Brutti", "Pierpaolo", "" ] ]
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801.332
Roberto Floreanini
S. Anderloni, F. Benatti and R. Floreanini
Noise induced current in a double-well trap
10 pages, LaTeX
null
null
null
quant-ph cond-mat.other
null
We study the behavior of cold atoms trapped in optical double well potentials in presence of noise, either generated by an external environment or by the trap itself. We show that quite in general the noise can induce a current between the two wells even when tunneling between the two wells is highly suppressed (Mott insulator phase). An engineered environment could provide a test ground for the behavior of such a current.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 08:01:11 GMT" } ]
2008-01-23T00:00:00
[ [ "Anderloni", "S.", "" ], [ "Benatti", "F.", "" ], [ "Floreanini", "R.", "" ] ]
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801.3321
W. Prellier
R. Ranjith, Asish K. Kundu, M.Filippi, B.Kundys, W. Prellier, B. Raveau, J. Laverdiere, M.P. Singh and S. Jandl
Ferromagnetism and magneto-dielectric effect in insulating LaBiMn4/3Co2/3O6 thin films
Submitted to Appl. Phys. Lett. (2008)
Appl. Phys. Lett. 92, 062909 (2008)
10.1063/1.2842409
null
cond-mat.mtrl-sci
null
High quality epitaxial thin films of LaBiMn4/3Co2/3O6 perovskite were fabricated on (001)-oriented SrTiO3 and LaAlO3 substrates by the pulsed laser deposition technique. Magnetization measurements reveal a strong magnetic anisotropy and a ferromagnetic behavior that is in agreement with a super-exchange interaction between Mn4+ and Co2+ ions, which are randomly distributed in the B-site. A distinct anomaly is observed in the dielectric measurements at 130K corresponding to the onset of the magnetic ordering, suggesting a coupling. Above this temperature, the extrinsic Maxwell-Wagner effect is dominating. Theses results are explained using the Raman spectroscopic studies indicating a weak spin-lattice interaction around this magnetic transition.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 08:07:00 GMT" } ]
2008-02-18T00:00:00
[ [ "Ranjith", "R.", "" ], [ "Kundu", "Asish K.", "" ], [ "Filippi", "M.", "" ], [ "Kundys", "B.", "" ], [ "Prellier", "W.", "" ], [ "Raveau", "B.", "" ], [ "Laverdiere", "J.", "" ], [ "Singh", "M. P.", "" ], [ "Jandl", "S.", "" ] ]
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801.3322
Kaitai Li
Kaitai Li, Jian Su, Liquan Mei
Boundary Shape Control of Navier-Stokes Equations and Geometrical Design Method for Blade's Surface in the Impeller
27 pages
null
null
null
math.AP math-ph math.MP
null
In this paper A Geometrical Design Method for Blade's surface $\Im$ in the impeller is provided here $\Im$ is a solution to a coupling system consisting of the well-known Navier-Stokes equations and a four order elliptic boundary value problem . The coupling system is used to describe the relations between solutions of Navier-Stokes equations and the geometry of the domain occupied by fluids, and also provides new theory and methods for optimal geometric design of the boundary of domain mentioned above. This coupling system is the Eular-Lagrange equations of the optimal control problem which is describing a new principle of the geometric design for the blade's surface of an impeller. The control variable is the surface of the blade and the state equations are Navier-Stokes equations with mixed boundary conditions in the channel between two blades. The objective functional depending on the geometry shape of blade's surface describes the dissipation energy of the flow and the power of the impeller. First we prove the existence of a solution of the optimal control problem. Then we use a special coordinate system of the Navier-Stokes equations to derive the objective functional which depends on the surface $\Theta$ explicitly. We also show the weakly continuity of the solution of the Navier-Stokes equations with respect to the geometry shape of the blade's surface.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 08:11:18 GMT" } ]
2008-01-23T00:00:00
[ [ "Li", "Kaitai", "" ], [ "Su", "Jian", "" ], [ "Mei", "Liquan", "" ] ]
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801.3323
Seung Chul Chae
Chunli Liu, S. C. Chae, S. H. Chang, S. B. Lee, T. W. Noh, J. S. Lee, B. Kahng, D.-W. Kim, C. U. Jung, S. Seo and Seung-Eon Ahn
Abnormal Resistance Switching Behaviors of NiO Thin Films: Possible Occurrence of Simultaneous Formation and Rupture of Conducting Channels
12 pages, 5 figures
null
10.1088/0022-3727/42/1/015506
null
cond-mat.mtrl-sci
null
We report the detailed current-voltage (I-V) characteristics of resistance switching in NiO thin films. In unipolar resistance switching, it is commonly believed that conducting filaments will rupture when NiO changes from a low resistance to a high resistance state. However, we found that this resistance switching can sometimes show abnormal behavior during voltage- and current-driven I-V measurements. We used the random circuit breaker network model to explain how abnormal switching behaviors could occur. We found that this resistance change can occur via a series of avalanche processes, where conducting filaments could be formed as well as ruptured.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 08:24:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "Chunli", "" ], [ "Chae", "S. C.", "" ], [ "Chang", "S. H.", "" ], [ "Lee", "S. B.", "" ], [ "Noh", "T. W.", "" ], [ "Lee", "J. S.", "" ], [ "Kahng", "B.", "" ], [ "Kim", "D. -W.", "" ], [ "Jung", "C. U.", "" ], [ "Seo", "S.", "" ], [ "Ahn", "Seung-Eon", "" ] ]
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801.3324
Roberto A. Sussman
Roberto A. Sussman
Quasi-local variables in spherical symmetry: numerical applications to dark matter and dark energy sources
Final version to appear in Physical Review D. More references added. 20 pages, RevTex 4 style, 8 pdf figures
Phys.Rev.D79:025009,2009
10.1103/PhysRevD.79.025009
null
gr-qc astro-ph hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A numerical approach is considered for spherically symmetric spacetimes that generalize Lemaitre-Tolman-Bondi dust solutions to nonzero pressure ("LTB spacetimes"). We introduce quasi-local (QL) variables that are covariant LTB objects satisfying evolution equations of Friedman-Lemaitre-Robertson-Walker (FLRW) cosmologies. We prove rigorously that relative deviations of the local covariant scalars from the QL scalars are non-linear, gauge invariant and covariant perturbations on a FLRW formal "background" given by the QL scalars. The dynamics of LTB spacetimes is completely determined by the QL scalars and these exact perturbations. Since LTB spacetimes are compatible with a wide variety of "equations of state", either single fluids or mixtures, a large number of known solutions with dark matter and dark energy sources in a FLRW framework (or with linear perturbations) can be readily examined under idealized but non-trivial inhomogeneous conditions. Coordinate choices and initial conditions are derived for a numerical treatment of the perturbation equations, allowing us to study non-linear effects in a variety of phenomena, such as gravitational collapse, non-local effects, void formation, dark matter and dark energy couplings and particle creation. In particular, the embedding of inhomogeneous regions can be performed by a smooth matching with a suitable FLRW solution, thus generalizing the Newtonian "top hat" models that are widely used in astrophysical literature. As examples of the application of the formalism, we examine numerically the formation of a black hole in an expanding Chaplygin gas FLRW universe, as well as the evolution of density clumps and voids in an interactive mixture of cold dark matter and dark energy.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 09:44:07 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 22:41:41 GMT" }, { "version": "v3", "created": "Wed, 30 Jan 2008 06:34:52 GMT" }, { "version": "v4", "created": "Tue, 7 Oct 2008 07:40:43 GMT" }, { "version": "v5", "created": "Tue, 23 Dec 2008 16:17:13 GMT" } ]
2010-05-12T00:00:00
[ [ "Sussman", "Roberto A.", "" ] ]
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801.3325
Sergey Troshin
S.M. Troshin, N.E. Tyurin
Directed flow and rotation of transient matter
4 pages, no figures, talk given at the XII Workshop on High Energy Spin Physics, Dubna, Russia, September 3 - 7, 2007; to appear in the Proceedings
null
null
null
hep-ph
null
Directed flow $v_1$ treated as an effect of the transient matter rotation in hadronic and nuclei reactions.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 08:38:48 GMT" } ]
2008-01-23T00:00:00
[ [ "Troshin", "S. M.", "" ], [ "Tyurin", "N. E.", "" ] ]
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801.3326
Yaron Antebi
Ofer Aharony, Yaron E. Antebi, Micha Berkooz
On the Conformal Field Theory Duals of type IIA AdS_4 Flux Compactifications
42 pages, 1 figure, latex; v2: added references
JHEP 0802:093,2008
10.1088/1126-6708/2008/02/093
WIS/02/08-JAN-DPP
hep-th
null
We study the conformal field theory dual of the type IIA flux compactification model of DeWolfe, Giryavets, Kachru and Taylor, with all moduli stabilized. We find its central charge and properties of its operator spectrum. We concentrate on the moduli space of the conformal field theory, which we investigate through domain walls in the type IIA string theory. The moduli space turns out to consist of many different branches. We use Bezout's theorem and Bernstein's theorem to enumerate the different branches of the moduli space and estimate their dimension.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 09:39:39 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 13:21:54 GMT" } ]
2009-09-29T00:00:00
[ [ "Aharony", "Ofer", "" ], [ "Antebi", "Yaron E.", "" ], [ "Berkooz", "Micha", "" ] ]
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801.3327
Albert Zijlstra
Albert Zijlstra, P.A.M. van Hoof, and R.A. Perley
The Evolution of NGC 7027 at Radio Frequencies: A New Determination of the Distance and Core Mass
submitted to the Astrophysical Journal
null
10.1086/588778
null
astro-ph
null
We present the results of a 25-year program to monitor the radio flux evolution of the planetary nebula NGC7027. We find significant evolution of the spectral flux densities. The flux density at 1465 MHz, where the nebula is optically thick, is increasing at a rate of 0.251+-0.015 % per year, caused by the expansion of the ionized nebula. At frequencies where the emission is optically thin, the spectral flux density is changing at a rate of -0.145+-0.005 % per year, caused by a decrease in the number of ionizing photons coming from the central star. A distance of 980+-100 pc is derived. By fitting interpolated models of post-AGB evolution to the observed changes, we find that over the 25-yr monitoring period, the stellar temperature has increased by 3900+-900 K and the stellar bolometric luminosity has decreased by 1.75+-0.38 %. We derive a distance-independent stellar mass of 0.655+-0.01 solar masses adopting the Bloecker stellar evolution models, or about 0.04 solar masses higher when using models of Vassiliadis & Wood which may provide a better fit. A Cloudy photoionization model is used to fit all epochs at all frequencies simultaneously. The differences between the radio flux density predictions and the observed values show some time-independent residuals of typically 1 %. A possible explanation is inaccuracies in the radio flux scale of Baars et al. We propose an adjustment to the flux density scale of the primary radio flux calibrator 3C286, based on the Cloudy model of NGC7027. We also calculate precise flux densities for NGC7027 for all standard continuum bands used at the VLA, as well as for some new 30GHz experiments.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 09:16:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Zijlstra", "Albert", "" ], [ "van Hoof", "P. A. M.", "" ], [ "Perley", "R. A.", "" ] ]
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801.3328
Mihai Tibar
Raimundo Ara\'ujo dos Santos and Mihai Tib\u{a}r
Real map germs and higher open books
12 pages
originally sent to London Math Soc on Dec. 7, 2007. Published without Section 5 in Geom. Dedicata (2010), 147:177-185
10.1007/s10711-009-9449-z
null
math.AG math.CV
null
We present a general criterion for the existence of open book structures defined by real map germs $(\bR^m, 0) \to (\bR^p, 0)$, where $m> p \ge 2$, with isolated critical point. We show that this is satisfied by weighted-homogeneous maps. We also derive sufficient conditions in case of map germs with isolated critical value.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 09:18:37 GMT" } ]
2010-12-21T00:00:00
[ [ "Santos", "Raimundo Araújo dos", "" ], [ "Tibăr", "Mihai", "" ] ]
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801.3329
YaJuan Lei
Y.J. Lei, J.L. Qu, L.M. Song, C.M. Zhang, S. Zhang, F. Zhang, J.M. Wang, Z.B. Li, G.B. Zhang
Evolution of cross-correlation and time lag of Cyg X-2 along the branches
23 pages 106 figures accepted for publication in ApJ
null
10.1086/533423
null
astro-ph
null
We report the detections of the anti-correlated soft and hard X-rays, and the time lags of $\sim$ hecto-second from the neutron star low-mass X-ray binary Cyg X-2, a well-known Z-type luminous source. Both the anti-correlation and the positive correlation were detected during the low-intensity states, while only the latter showed up during high-intensity states. Comparing with the lower part of normal branch and flaring branch, more observations located on the horizontal and the upper normal branches are accompanied with the anti-correlation, implying the occurrence of the anti-correlation under circumstance of a low mass accretion rate. So far the anti-correlated hard lag of thousand-second timescale are only reported from the Galactic black hole candidates in their hard states. Here we provide the first evidence that a similar feature can also establish in a neutron-star system like Cyg X-2. Finally, the possible origins of the observed time lags are discussed under the current LMXB models.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:07:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Lei", "Y. J.", "" ], [ "Qu", "J. L.", "" ], [ "Song", "L. M.", "" ], [ "Zhang", "C. M.", "" ], [ "Zhang", "S.", "" ], [ "Zhang", "F.", "" ], [ "Wang", "J. M.", "" ], [ "Li", "Z. B.", "" ], [ "Zhang", "G. B.", "" ] ]
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801.333
Jean-Fran\c{c}ois Marckert
Jean-Fran\c{c}ois Marckert
The lineage process in Galton--Watson trees and globally centered discrete snakes
Published in at http://dx.doi.org/10.1214/07-AAP450 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Probability 2008, Vol. 18, No. 1, 209-244
10.1214/07-AAP450
IMS-AAP-AAP450
math.PR
null
We consider branching random walks built on Galton--Watson trees with offspring distribution having a bounded support, conditioned to have $n$ nodes, and their rescaled convergences to the Brownian snake. We exhibit a notion of ``globally centered discrete snake'' that extends the usual settings in which the displacements are supposed centered. We show that under some additional moment conditions, when $n$ goes to $+\infty$, ``globally centered discrete snakes'' converge to the Brownian snake. The proof relies on a precise study of the lineage of the nodes in a Galton--Watson tree conditioned by the size, and their links with a multinomial process [the lineage of a node $u$ is the vector indexed by $(k,j)$ giving the number of ancestors of $u$ having $k$ children and for which $u$ is a descendant of the $j$th one]. Some consequences concerning Galton--Watson trees conditioned by the size are also derived.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 09:42:39 GMT" } ]
2008-01-28T00:00:00
[ [ "Marckert", "Jean-François", "" ] ]
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801.3331
Guillaume Hanrot
Guillaume Hanrot (INRIA Lorraine - LORIA), Damien Stehl\'e (INRIA Rh\^one-Alpes)
Worst-Case Hermite-Korkine-Zolotarev Reduced Lattice Bases
null
null
null
null
math.NT cs.CC cs.CR
null
The Hermite-Korkine-Zolotarev reduction plays a central role in strong lattice reduction algorithms. By building upon a technique introduced by Ajtai, we show the existence of Hermite-Korkine-Zolotarev reduced bases that are arguably least reduced. We prove that for such bases, Kannan's algorithm solving the shortest lattice vector problem requires $d^{\frac{d}{2\e}(1+o(1))}$ bit operations in dimension $d$. This matches the best complexity upper bound known for this algorithm. These bases also provide lower bounds on Schnorr's constants $\alpha_d$ and $\beta_d$ that are essentially equal to the best upper bounds. Finally, we also show the existence of particularly bad bases for Schnorr's hierarchy of reductions.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 09:52:35 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 15:13:23 GMT" } ]
2008-01-24T00:00:00
[ [ "Hanrot", "Guillaume", "", "INRIA Lorraine - LORIA" ], [ "Stehlé", "Damien", "", "INRIA\n Rhône-Alpes" ] ]
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801.3332
Miguel Marques
Miguel A. L. Marques and N. N. Lathiotakis
Empirical Functionals for Reduced Density Matrix Functional Theory
4 pages, 2 figures
Phys. Rev. A 77, 032509 (2008)
10.1103/PhysRevA.77.032509
null
physics.comp-ph physics.chem-ph
null
We present fully empirical exchange-correlation functionals to be used within reduced density matrix functional theory (RDMFT). These are of the popular J-K form, where the function of the occupation numbers that multiplies the Fock orbital term is written as a Pade approximant. The coefficients of the Pade are optimized for a testset of eight molecules, and then refined for a larger set of 35 molecules. Two different approaches were tried, either keeping the self-interaction terms, or by removing them explicitly from the functional. The functionals thus obtained involve very few parameters, but are able to outperform other RDMFT functionals, yielding correlation energies that are, on average, even slightly better than Moeller-Plesset MP2 theory.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 09:59:50 GMT" } ]
2017-03-03T00:00:00
[ [ "Marques", "Miguel A. L.", "" ], [ "Lathiotakis", "N. N.", "" ] ]
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801.3333
Qing-Bo Yan
Qing-Bo Yan, Qing-Rong Zheng, and Gang Su
Structures, Electronic Properties, Spectroscopies and Hexagonal Monolayer Phase of a Family of Unconventional Fullerenes C64X4 (X = H; F;Cl;Br)
17 pages, 6 figures
J. Phys. Chem. C 2007, 111, 549-554
null
null
cond-mat.mtrl-sci
null
A systematic first-principles study within density functional theory on the geometrical structures and electronic properties of unconventional fullerene C64 and its derivatives C64X4 (X = H; F;Cl;Br) has been performed. By searching through all 3465 isomers of C64, the ground state of C64 is found to be spherical shape with D2 symmetry, which differs from the parent cage of the recently synthesized C64H4 that is pear-shaped with C3v symmetry. We found that the addition of the halogen atoms like F;Cl;Br to the pentagon-pentagon fusion vertex of C64 cage could enhance the stability, forming the unconventional fullerenes C64X4. The Mulliken charge populations, LUMO-HOMO gap energies and density of states are calculated, showing that different halogen atoms added to C64 will cause remarkably different charge populations of the C64X4 molecule; the chemical deriving could enlarge the energy gaps and affect the electronic structures distinctly. It is unveiled that C64F4 is even more stable than C64H4, as the C-X bond energy of the former is higher than that of the latter. The computed spectra of C64H4 molecules agree well with the experimental data; the IR, Raman, NMR spectra of C64X4 (X = F;Cl;Br) are also calculated to stimulate further experimental investigations. Finally, it is uncovered by total energy calculations that C64X4 could form a stable hexagonal monolayer.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:05:33 GMT" } ]
2008-01-23T00:00:00
[ [ "Yan", "Qing-Bo", "" ], [ "Zheng", "Qing-Rong", "" ], [ "Su", "Gang", "" ] ]
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801.3334
Stefano Scopel
A. Bottino (1), N. Fornengo (1), G. Polesello (2), S. Scopel (3) ((1) Univ. of Torino and INFN-Torino (2) INFN-Pavia (3) Korea Institute of Advanced Study, Seoul)
Light neutralinos at LHC in cosmologically-inspired scenarios: new benchmarks in the search for supersymmetry
21 pages, 17 figures
Phys.Rev.D77:115026,2008
10.1103/PhysRevD.77.115026
DFTT 3/2008, KIAS-P08014
hep-ph astro-ph
null
We study how the properties of the four neutralino states, chi_i (i = 1, 2, 3, 4), can be investigated at the Large Hadron Collider (LHC), in the case when the lightest one, chi_1, has a mass m_chi < 50 GeV and is stable. This situation arises naturally in supersymmetric models where gaugino masses are not unified at a Grand Unified (GUT) scale and R-parity is conserved. The main features of these neutralino states are established by analytical and numerical analyses, and two scenarios are singled out on the basis of the cosmological properties required for the relic neutralinos. Signals expected at LHC are discussed through the main chain processes started by a squark, produced in the initial proton-proton scattering. We motivate the selection of some convenient benchmarks, in the light of the spectroscopical properties (mass spectrum and transitions) of the four neutralino states. Branching ratios and the expected total number of events are derived in the various benchmarks, and their relevance for experimental determination of neutralino properties is finally discussed.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:15:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Bottino", "A.", "" ], [ "Fornengo", "N.", "" ], [ "Polesello", "G.", "" ], [ "Scopel", "S.", "" ] ]
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801.3335
Daniel Gazda
D. Gazda, E. Friedman, A. Gal, J. Mare\v{s}
Multi-$\bar{K}$ nuclei and kaon condensation
21 pages, 8 figures, revised text and references
Phys.Rev.C77:045206,2008
10.1103/PhysRevC.77.045206
null
nucl-th
null
We extend previous relativistic mean-field (RMF) calculations of multi-$\bar K$ nuclei, using vector boson fields with SU(3) PPV coupling constants and scalar boson fields constrained phenomenologically. For a given core nucleus, the resulting $\bar K$ separation energy $B_{\bar K}$, as well as the associated nuclear and $\bar K$-meson densities, saturate with the number $\kappa$ of $\bar K$ mesons for $\kappa > \kappa_{\rm sat} \sim 10$. Saturation appears robust against a wide range of variations, including the RMF nuclear model used and the type of boson fields mediating the strong interactions. Because $B_{\bar K}$ generally does not exceed 200 MeV, it is argued that multi-$\bar K$ nuclei do not compete with multihyperonic nuclei in providing the ground state of strange hadronic configurations and that kaon condensation is unlikely to occur in strong-interaction self-bound strange hadronic matter. Last, we explore possibly self-bound strange systems made of neutrons and ${\bar K}^0$ mesons, or protons and $K^-$ mesons, and study their properties.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:52:43 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 16:42:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Gazda", "D.", "" ], [ "Friedman", "E.", "" ], [ "Gal", "A.", "" ], [ "Mareš", "J.", "" ] ]
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801.3336
Luca Pasquini
Luca Pasquini, M.P. Doellinger, A. Hatzes, J. Setiawan, L. Girardi, L. da Silva, J.R. de Medeiros
Testing planet formation theories with Giant stars
IAU 249: Exoplanets: Detection, Formation and Dynamics J.L. Zhou, Y.S. Sun & S. Ferraz-Mello, eds. in press
null
null
null
astro-ph
null
Planet searches around evolved giant stars are bringing new insights to planet formation theories by virtue of the broader stellar mass range of the host stars compared to the solar-type stars that have been the subject of most current planet searches programs. These searches among giant stars are producing extremely interesting results. Contrary to main sequence stars planet-hosting giants do not show a tendency of being more metal rich. Even if limited, the statistics also suggest a higher frequency of giant planets (at least 10 %) that are more massive compared to solar-type main sequence stars. The interpretation of these results is not straightforward. We propose that the lack of a metallicity-planet connection among giant stars is due to pollution of the star while on the main sequence, followed by dilution during the giant phase. We also suggest that the higher mass and frequency of the planets are due to the higher stellar mass. Even if these results do not favor a specific formation scenario, they suggest that planetary formation might be more complex than what has been proposed so far, perhaps with two mechanisms at work and one or the other dominating according to the stellar mass. We finally stress as the detailed study of the host stars and of the parent sample is essential to derive firm conclusions.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:20:22 GMT" } ]
2008-01-23T00:00:00
[ [ "Pasquini", "Luca", "" ], [ "Doellinger", "M. P.", "" ], [ "Hatzes", "A.", "" ], [ "Setiawan", "J.", "" ], [ "Girardi", "L.", "" ], [ "da Silva", "L.", "" ], [ "de Medeiros", "J. R.", "" ] ]
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801.3337
Jose Luis Toca-Herrera
Johann Faccelo Osma Cruz
Banana skin: a novel material for a low-cost production of laccase
Master Thesis (Chemical Engineering Department, Rovira i Virgili University, Spain) Supervisors: Susana Rodriguez Couto and Jose L. Toca-Herrera Pages: 28, Figures: 12, Tables: 1
null
null
null
physics.chem-ph physics.bio-ph
null
Laccases (benzenodiol: oxygen oxidoreductases; EC 1.10.3.2) are multicopper oxidases of wide substrate specificity mainly found in white-rot fungi, which are the only microorganisms able to degrade the whole wood components, but they are also expressed in bacteria and higher plants. Laccases are used currently in biotechnological processes because this enzyme oxidizes both phenolic and non-phenolic lignin-related compounds as well as highly recalcitrant environmental pollutants. In this work banana skin has been selected as a supporting material for laccase produntion because of its high content in carbohydrates, which due to their organic nature are easily metabolized by the fungus. In addition, its content in ascorbic acid exerts an inhibitory effect against bacteria. The activity of the produced laccase is tested in decoloration studies.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:23:03 GMT" } ]
2008-01-23T00:00:00
[ [ "Cruz", "Johann Faccelo Osma", "" ] ]
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801.3338
Andrea Fischer Miss
Andrzej Eilmes, Andrea M. Fischer, Rudolf A. R\"omer
Critical parameters for the disorder-induced metal-insulator transition in FCC and BCC lattices
7 RevTex pages, 9 figures with 10 figure files included, submitted to Physical Review B
Phys. Rev. B 77, 245117-8 (2008)
10.1103/PhysRevB.77.245117
null
cond-mat.dis-nn cond-mat.mtrl-sci
null
We use a transfer-matrix method to study the disorder-induced metal-insulator transition. We take isotropic nearest- neighbor hopping and an onsite potential with uniformly distributed disorder. Following previous work done on the simple cubic lattice, we perform numerical calculations for the body centered cubic and face centered cubic lattices, which are more common in nature. We obtain the localization length from calculated Lyapunov exponents for different system sizes. This data is analyzed using finite-size scaling to find the critical parameters. We create an energy-disorder phase diagram for both lattice types, noting that it is symmetric about the band center for the body centered cubic lattice, but not for the face centered cubic lattice. We find a critical exponent of approximately 1.5-1.6 for both lattice types for transitions occurring either at fixed energy or at fixed disorder, agreeing with results previously obtained for other systems belonging to the same orthogonal universality class. We notice an increase in critical disorder with the number of nearest neighbors, which agrees with intuition.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:23:37 GMT" } ]
2008-07-16T00:00:00
[ [ "Eilmes", "Andrzej", "" ], [ "Fischer", "Andrea M.", "" ], [ "Römer", "Rudolf A.", "" ] ]
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801.3339
Colette Moeglin
Colette Moeglin (IMJ)
Holomorphie des op\'erateurs d'entrelacement normalis\'es \`a l'aide des param\`etres d'Arthur
null
null
null
null
math.RT
null
In this paper we prove holomorphy for certain intertwining operators arising from the theory of Eisenstein series.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:37:23 GMT" } ]
2008-01-23T00:00:00
[ [ "Moeglin", "Colette", "", "IMJ" ] ]
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801.334
Long Jiang
Long Jiang
Convexity, translation invariance and subadditivity for $g$-expectations and related risk measures
Published in at http://dx.doi.org/10.1214/105051607000000294 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Probability 2008, Vol. 18, No. 1, 245-258
10.1214/105051607000000294
IMS-AAP-AAP0229
math.PR
null
Under the continuous assumption on the generator $g$, Briand et al. [Electron. Comm. Probab. 5 (2000) 101--117] showed some connections between $g$ and the conditional $g$-expectation $({\mathcal{E}}_g[\cdot|{\mathcal{F}}_t])_{t\in[0,T]}$ and Rosazza Gianin [Insurance: Math. Econ. 39 (2006) 19--34] showed some connections between $g$ and the corresponding dynamic risk measure $(\rho^g_t)_{t\in[0,T]}$. In this paper we prove that, without the additional continuous assumption on $g$, a $g$-expectation ${\mathcal{E}}_g$ satisfies translation invariance if and only if $g$ is independent of $y$, and ${\mathcal{E}}_g$ satisfies convexity (resp. subadditivity) if and only if $g$ is independent of $y$ and $g$ is convex (resp. subadditive) with respect to $z$. By these conclusions we deduce that the static risk measure $\rho^g$ induced by a $g$-expectation ${\mathcal{E}}_g$ is a convex (resp. coherent) risk measure if and only if $g$ is independent of $y$ and $g$ is convex (resp. sublinear) with respect to $z$. Our results extend the results in Briand et al. [Electron. Comm. Probab. 5 (2000) 101--117] and Rosazza Gianin [Insurance: Math. Econ. 39 (2006) 19--34] on these subjects.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 10:49:54 GMT" } ]
2008-01-28T00:00:00
[ [ "Jiang", "Long", "" ] ]
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801.3341
Mary Erlund
M.C. Erlund, A.C. Fabian, Katherine M. Blundell and Carolin S. Crawford
The Compton-thick quasar at the heart of the high-redshift giant radio galaxy 6C 0905+39
5 pages, 5 figures, accepted to MNRAS
null
10.1111/j.1745-3933.2008.00448.x
null
astro-ph
null
Our XMM-Newton spectrum of the giant, high-redshift (z=1.88) radio galaxy 6C 0905+39 shows that it contains one of the most powerful, high-redshift, Compton-thick quasars known. Its spectrum is very hard above 2 keV. The steep XMM spectrum below that energy is shown to be due to extended emission from the radio bridge using Chandra data. The nucleus of 6C 0905+39 has a column density of 3.5 (+1.4,-0.4) X 10^24 cm^-2 and absorption-corrected X-ray luminosity of 1.7 (+0.9,-0.1) X 10^45 erg/s in the 2-10 keV band. A lower redshift active galaxy in the same field, SDSS J090808.36+394313.6, may also be Compton-thick.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 12:07:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Erlund", "M. C.", "" ], [ "Fabian", "A. C.", "" ], [ "Blundell", "Katherine M.", "" ], [ "Crawford", "Carolin S.", "" ] ]
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801.3342
Olaf Scholten
Olaf Scholten and Arjen van Vliet
Determining neutrino absorption spectra at Ultra-High Energies
7 figures, submitted to JCAP revision: References updated and minor changes in text
JCAP 0806:015,2008
10.1088/1475-7516/2008/06/015
null
astro-ph
null
A very efficient method to measure the flux of Ultra-high energy (UHE) neutrinos is through the detection of radio waves which are emitted by the particle shower in the lunar regolith. The highest acceptance is reached for radio waves in the frequency band of 100-200 MHz which can be measured with modern radio telescopes. In this work we investigate the sensitivity of this detection method to structures in the UHE neutrino spectrum caused by their absorption on the low-energy relic anti-neutrino background through the Z-boson resonance. The position of the absorption peak is sensitive to the neutrino mass and the redshift of the source. A new generation of low-frequency digital radio telescopes will provide excellent detection capabilities for measuring these radio pulses, thus making our consideration here very timely.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:22:47 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 17:03:15 GMT" } ]
2009-06-23T00:00:00
[ [ "Scholten", "Olaf", "" ], [ "van Vliet", "Arjen", "" ] ]
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801.3343
Norbert Van den Bergh
H.R. Karimian, N. Van den Bergh and L. De Groote
Purely radiative perfect fluids with degenerate shear tensor
8 pages, references added, typos corrected, simplified some algebraic manipulations
Class.Quant.Grav.25:125010,2008
10.1088/0264-9381/25/12/125010
null
gr-qc
null
We consider non-rotating geodesic perfect fluid spacetimes which are purely radiative in the sense that the gravitational field satisfies the covariant transverse conditions div H = div E = 0. We show that when the shear tensor S is degenerate, H, E and S necessarily commute and hence the resulting spacetimes are hypersurface homogeneous of Bianchi class A (modulo some purely electric exceptions).
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:31:19 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 09:03:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Karimian", "H. R.", "" ], [ "Bergh", "N. Van den", "" ], [ "De Groote", "L.", "" ] ]
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801.3344
Nicolas Clauvelin
N. Clauvelin, B. Audoly and S. Neukirch
Mechanical response of plectonemic DNA: an analytical solution
14 pages, 4 figures
null
10.1021/ma702713x
null
q-bio.BM
null
We consider an elastic rod model for twisted DNA in the plectonemic regime. The molecule is treated as an impenetrable tube with an effective, adjustable radius. The model is solved analytically and we derive formulas for the contact pressure, twisting moment and geometrical parameters of the supercoiled region. We apply our model to magnetic tweezer experiments of a DNA molecule subjected to a tensile force and a torque, and extract mechanical and geometrical quantities from the linear part of the experimental response curve. These reconstructed values are derived in a self-contained manner, and are found to be consistent with those available in the literature.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:36:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Clauvelin", "N.", "" ], [ "Audoly", "B.", "" ], [ "Neukirch", "S.", "" ] ]
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801.3345
Salih Celik
Salih Celik and Erg\"un Yasar
The Hopf algebra structure of the Z$_3$-graded quantum supergroup GL$_{q,j}(1|1)$
null
J. Math. Phys. 49 (2008) Art. No: 023511
10.1063/1.2873369
null
math.QA
null
In this work, we give some features of the Z$_3$-graded quantum supergroup.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:38:38 GMT" } ]
2014-02-25T00:00:00
[ [ "Celik", "Salih", "" ], [ "Yasar", "Ergün", "" ] ]
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801.3346
Marco Lombardi
M. Lombardi, C. Lada, J. Alves
Hipparcos distances of Ophiuchus and Lupus cloud complexes
A&A in press - Corrected typo (Lupus distance) in the electronic abstract
null
10.1051/0004-6361:20079110
null
astro-ph
null
We combine extinction maps from the Two Micron All Sky Survey (2MASS) with Hipparcos and Tycho parallaxes to obtain reliable and high-precision estimates of the distance to the Ophiuchus and Lupus dark complexes. Our analysis, based on a rigorous maximum-likelihood approach, shows that the rho-Ophiuchi cloud is located at (119 +/- 6) pc and the Lupus complex is located at (155 +/- 8) pc; in addition, we are able to put constraints on the thickness of the clouds and on their orientation on the sky (both these effects are not included in the error estimate quoted above). For Ophiuchus, we find some evidence that the streamers are closer to us than the core. The method applied in this paper is currently limited to nearby molecular clouds, but it will find many natural applications in the GAIA-era, when it will be possible to pin down the distance and three-dimensional structure of virtually every molecular cloud in the Galaxy.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:39:44 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 12:53:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Lombardi", "M.", "" ], [ "Lada", "C.", "" ], [ "Alves", "J.", "" ] ]
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801.3347
Grachev Stanislav
S.I. Grachev, V.K. Dubrovich
Dynamics of Primordial Hydrogen Recombination with Allowance for a Recoil for Scattering in the Ly-alpha Line
9 pages, 5 figures; accepted for publication in Astronomy Letters
null
10.1134/S1063773708070013
null
astro-ph
null
It is shown that taking into account a recoil for radiation scattering in the Ly-alpha line can lead to a noticable acceleration of primordial hydrogen recombination. Thus for LambdaCDM model a decrease of ionization degree exceeds 1% for redshifts z in a range 800 - 1050 achieving approximately 1.3% at z=900. Corresponding corrections to the cosmic microwave background power spectra can achieve 1.1% for TT spectra and 1.7% for EE ones. Radiative transfer in these calculations was treated in a quasistationary approximation. Numerical solutions are also obtained in diffusion approximation for a nonstationary problem of Ly-alpha line radiative transfer under partial frequency redistribution with a recoil. An evolution of a local line profile is traced to as well as an evolution of a relative number of uncompensated transitions from 2p state down to 1s one. It is shown that taking into account nonstationarity of Ly-alpha line radiative transfer can lead to an additional acceleration of primordial hydrogen recombination.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:41:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Grachev", "S. I.", "" ], [ "Dubrovich", "V. K.", "" ] ]
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801.3348
Theodoros Tsagaris
Theodoros Tsagaris
Statistical Arbitrage and Optimal Trading with Transaction Costs in Futures Markets
28 pages, submitted to journal
null
null
null
q-fin.TR math.OC math.PR
null
We consider the Brownian market model and the problem of expected utility maximization of terminal wealth. We, specifically, examine the problem of maximizing the utility of terminal wealth under the presence of transaction costs of a fund/agent investing in futures markets. We offer some preliminary remarks about statistical arbitrage strategies and we set the framework for futures markets, and introduce concepts such as margin, gearing and slippage. The setting is of discrete time, and the price evolution of the futures prices is modelled as discrete random sequence involving Ito's sums. We assume the drift and the Brownian motion driving the return process are non-observable and the transaction costs are represented by the bid-ask spread. We provide explicit solution to the optimal portfolio process, and we offer an example using logarithmic utility.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:44:01 GMT" } ]
2008-12-02T00:00:00
[ [ "Tsagaris", "Theodoros", "" ] ]
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801.3349
Wei Zhu
Jianhong Ruan, Zhenqi Shen and Wei Zhu
Nuclear Shadowing and Antishadowing in a Unitarized BFKL Equation
19 pages, 6 figures, to be appeared in Chinese Physics C
null
10.1088/1674-1137/32/9/009
null
hep-ph
null
The nuclear shadowing and antishadowing effects are explained by a unitarized BFKL equation. The $Q^2$- and $x$-variations of the nuclear parton distributions are detailed based on the level of the unintegrated gluon distribution. In particular, the asymptotical behavior of the unintegrated gluon distribution near the saturation limit in nuclear targets is studied. Our results in the nuclear targets are insensitive to the input distributions if the parameters are fixed by the data of a free proton.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:46:57 GMT" } ]
2015-05-13T00:00:00
[ [ "Ruan", "Jianhong", "" ], [ "Shen", "Zhenqi", "" ], [ "Zhu", "Wei", "" ] ]
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801.335
Xi Chen
Xi Chen, Qing-Rong Zheng and Gang Su
Quantum Oscillations of Tunnel Magnetoresistance Induced by Spin-Wave Excitations in Ferromagnet-Ferromagnet-Ferromagnet Double Barrier Tunnel Junctions
19 pages, 6 figures
PHYSICAL REVIEW B 76,144409(2007)
10.1103/PhysRevB.76.144409
null
cond-mat.mes-hall
null
The possibility of quantum oscillations of the tunnel conductance and magnetoresistance induced by spin-wave excitations in a ferromagnet-ferromagnet-ferromagnet double barrier tunnel junction, when the magnetizations of the two side ferromagnets are aligned antiparallel to that of the middle ferromagnet, is investigated in a self-consistent manner by means of Keldysh nonequilibrium Green function method. It has been found that owing to the s-d exchange interactions between conduction electrons and the spin density induced by spin accumulation in the middle ferromagnet, the differential conductance and the TMR indeed oscillate with the increase of bias voltage, being consistent with the phenomenon that is observed recently in experiments. The effects of magnon modes, the energy levels of electrons as well as the molecular field in the central ferromagnet on the oscillatory transport property of the system are also discussed.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:47:47 GMT" } ]
2008-01-23T00:00:00
[ [ "Chen", "Xi", "" ], [ "Zheng", "Qing-Rong", "" ], [ "Su", "Gang", "" ] ]
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801.3351
Thorsten Schumm
Martin Trinker, S\"onke Groth, Stefan Haslinger, Stephanie Manz, Thomas Betz, Israel Bar-Joseph, Thorsten Schumm, J\"org Schmiedmayer
Multi-layer atom chips for versatile atom micro manipulation
4 pages, 5 figures
Appl. Phys. Lett. 92, 254102 (2008)
10.1063/1.2945893
null
physics.atom-ph physics.ins-det
null
We employ a combination of optical UV- and electron-beam-lithography to create an atom chip combining sub-micron wire structures with larger conventional wires on a single substrate. The new multi-layer fabrication enables crossed wire configurations, greatly enhancing the flexibility in designing potentials for ultra cold quantum gases and Bose-Einstein condensates. Large current densities of >6 x 10^7 A/cm^2 and high voltages of up to 65 V across 0.3 micron gaps are supported by even the smallest wire structures. We experimentally demonstrate the flexibility of the next generation atom chip by producing Bose-Einstein condensates in magnetic traps created by a combination of wires involving all different fabrication methods and structure sizes.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 11:48:15 GMT" } ]
2008-06-24T00:00:00
[ [ "Trinker", "Martin", "" ], [ "Groth", "Sönke", "" ], [ "Haslinger", "Stefan", "" ], [ "Manz", "Stephanie", "" ], [ "Betz", "Thomas", "" ], [ "Bar-Joseph", "Israel", "" ], [ "Schumm", "Thorsten", "" ], [ "Schmiedmayer", "Jörg", "" ] ]
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801.3352
Piero Barone
Piero Barone
On the condensed density of the generalized eigenvalues of pencils of Hankel Gaussian random matrices and applications
30 pages, 16 figures, better approximations provided
Journal of Multivariate Analysis 111 (2012) 160-173
10.1016/j.jmva.2012.05.009
null
math.ST math.PR stat.CO stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pencils of Hankel matrices whose elements have a joint Gaussian distribution with nonzero mean and not identical covariance are considered. An approximation to the distribution of the squared modulus of their determinant is computed which allows to get a closed form approximation of the condensed density of the generalized eigenvalues of the pencils. Implications of this result for solving several moments problems are discussed and some numerical examples are provided.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 16:29:20 GMT" }, { "version": "v2", "created": "Tue, 7 Sep 2010 08:53:36 GMT" } ]
2012-09-28T00:00:00
[ [ "Barone", "Piero", "" ] ]
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801.3353
Yosef Rinott
Sergiu Hart, Yosef Rinott, Benjamin Weiss
Evolutionarily stable strategies of random games, and the vertices of random polygons
Published in at http://dx.doi.org/10.1214/07-AAP455 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Probability 2008, Vol. 18, No. 1, 259-287
10.1214/07-AAP455
IMS-AAP-AAP455
math.PR econ.TH
null
An evolutionarily stable strategy (ESS) is an equilibrium strategy that is immune to invasions by rare alternative (``mutant'') strategies. Unlike Nash equilibria, ESS do not always exist in finite games. In this paper we address the question of what happens when the size of the game increases: does an ESS exist for ``almost every large'' game? Letting the entries in the $n\times n$ game matrix be independently randomly chosen according to a distribution $F$, we study the number of ESS with support of size $2.$ In particular, we show that, as $n\to \infty$, the probability of having such an ESS: (i) converges to 1 for distributions $F$ with ``exponential and faster decreasing tails'' (e.g., uniform, normal, exponential); and (ii) converges to $1-1/\sqrt{e}$ for distributions $F$ with ``slower than exponential decreasing tails'' (e.g., lognormal, Pareto, Cauchy). Our results also imply that the expected number of vertices of the convex hull of $n$ random points in the plane converges to infinity for the distributions in (i), and to 4 for the distributions in (ii).
[ { "version": "v1", "created": "Tue, 22 Jan 2008 12:37:16 GMT" } ]
2022-09-22T00:00:00
[ [ "Hart", "Sergiu", "" ], [ "Rinott", "Yosef", "" ], [ "Weiss", "Benjamin", "" ] ]
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801.3354
Masaru Fujino
Masaru Fujino
$C^*$-algebras arising from substitutions
19 pages
null
null
null
math.OA math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we introduce a $C^{\ast}$-algebra associated with a proper primitive substitution. We show that the $C^{\ast}$-algebra is simple and purely infinite and contains the associated Cuntz-Krieger algebra and the crossed product $C^{\ast}$-algebra of the corresponding Cantor minimal system. We calculate the $K$-groups.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 12:40:51 GMT" }, { "version": "v2", "created": "Wed, 25 Jun 2008 22:32:18 GMT" } ]
2008-06-26T00:00:00
[ [ "Fujino", "Masaru", "" ] ]
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801.3355
Robert Harlander
Robert Harlander, Jens Vollinga, Marcus Weber
Gluon-Induced Weak Boson Fusion
9 pages, 8 figures (21 included ps- and eps-files)
Phys.Rev.D77:053010,2008
10.1103/PhysRevD.77.053010
NIKHEF/2007-025, WUB/07-12
hep-ph
null
The gluon-gluon induced terms for Higgs production through weak boson fusion (WBF) are computed. Formally, these are of NNLO in the strong coupling constant. This is the lowest order at which non-zero color exchange occurs between the scattering quarks, leading to a color field and thus additional hadronic activity between the outgoing jets. Using a minimal set of cuts, the numerical impact of these terms is at the percent level with respect to the NLO rate for weak boson fusion. Applying the so-called WBF cuts leads to an even stronger suppression, so that we do not expect a significant deterioration of the WFB signal by these color exchange effects.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 12:46:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Harlander", "Robert", "" ], [ "Vollinga", "Jens", "" ], [ "Weber", "Marcus", "" ] ]
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801.3356
Viviane Baladi
Viviane Baladi and Daniel Smania
Analyticity of the SRB measure for holomorphic families of quadratic-like Collet-Eckmann maps
7 pages
null
null
null
math.DS
null
We show that if f_t is a holomorphic family of quadratic-like maps with all periodic orbits repelling so that for each real t the map f_t is a real Collet-Eckmann S-unimodal map then, writing m_t for the unique absolutely continuous invariant probability measure of f_t, the map t -> \int g dm_t is real analytic for any real analytic function g.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 12:48:36 GMT" } ]
2008-01-23T00:00:00
[ [ "Baladi", "Viviane", "" ], [ "Smania", "Daniel", "" ] ]
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801.3357
Florent Ravelet
Florent Ravelet (SPEC, AHD), Arnaud Chiffaudel (SPEC), Francois Daviaud (SPEC)
Supercritical transition to turbulence in an inertially-driven von Karman closed flow
null
Journal of Fluid Mechanics 601 (2008) 339-364
null
null
physics.flu-dyn
null
We study the transition from laminar flow to fully developed turbulence for an inertially-driven von Karman flow between two counter-rotating large impellers fitted with curved blades over a wide range of Reynolds number (100 - 1 000 000). The transition is driven by the destabilisation of the azimuthal shear-layer, i.e., Kelvin-Helmholtz instability which exhibits travelling/drifting waves, modulated travelling waves and chaos below the emergence of a turbulent spectrum. A local quantity -the energy of the velocity fluctuations at a given point- and a global quantity -the applied torque- are used to monitor the dynamics. The local quantity defines a critical Reynolds number Rec for the onset of time-dependence in the flow, and an upper threshold/crossover Ret for the saturation of the energy cascade. The dimensionless drag coefficient, i.e., the turbulent dissipation, reaches a plateau above this finite Ret, as expected for a "Kolmogorov"-like turbulence for Re -> infinity. Our observations suggest that the transition to turbulence in this closed flow is globally supercritical: the energy of the velocity fluctuations can be considered as an order parameter characterizing the dynamics from the first laminar time-dependence up to the fully developed turbulence. Spectral analysis in temporal domain moreover reveals that almost all of the fluctuations energy is stored in time-scales one or two orders of magnitude slower than the time-scale based on impeller frequency.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 12:51:19 GMT" } ]
2008-03-17T00:00:00
[ [ "Ravelet", "Florent", "", "SPEC, AHD" ], [ "Chiffaudel", "Arnaud", "", "SPEC" ], [ "Daviaud", "Francois", "", "SPEC" ] ]
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801.3358
Mohammad R. Garousi
Mohammad R. Garousi, Hanif Golchin
On higher derivative corrections of tachyon action
22 pages, 1 figure, latex file, V2: minor change in notation
Nucl.Phys.B800:547-564,2008
10.1016/j.nuclphysb.2008.03.005
null
hep-th
null
We have examined the momentum expansion of the disk level S-matrix element of two tachyons and two gauge fields to find, up to on-shell ambiguity, the couplings of these fields in the world volume theory of N coincident non-BPS D-branes to all order of $\alpha'$. Using the proposal that the action of D-brane-anti-D-brane is given by the projection of the action of two non-BPS D-branes with $(-1)^{F_L}$, we find the corresponding couplings in the world volume theory of the brane-anti-brane system. Using these infinite tower of couplings, we then calculate the massless pole of the scattering amplitude of one RR field, two tachyons and one gauge field in the brane-anti-brane theory. We find that the massless pole of the field theory amplitude is exactly equal to the massless pole of the disk level S-matrix element of one RR, two tachyons and one gauge field to all order of $\alpha'$.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:21:32 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 14:31:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Garousi", "Mohammad R.", "" ], [ "Golchin", "Hanif", "" ] ]
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801.3359
Ezio Maina
A. Ballestrero, A. Belhouari, G. Bevilacqua, V. Kashkan, E. Maina
PHANTOM: a Monte Carlo event generator for six parton final states at high energy colliders
Version updated to agree with published one in Comp.Phys.Comm
null
10.1016/j.cpc.2008.10.005
DFTT 13/2007
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
PHANTOM is a tree level Monte Carlo for six parton final states at proton--proton, proton--antiproton and electron--positron collider at O(alpha_ew^6) and O(alpha_ew^4*alpha_s^2) including possible interferences between the two sets of diagrams. This comprehends all purely electroweak contribution as well as all contributions with one virtual or two external gluons. It can generate unweighted events for any set of processes and it is interfaced to parton shower and hadronization packages via the last Les Houches Accord protocol. It can be used to analyze the physics of boson boson scattering, Higgs boson production in boson boson fusion, t-tbar and three boson production.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:17:06 GMT" }, { "version": "v2", "created": "Mon, 5 Jan 2009 15:36:30 GMT" } ]
2009-01-05T00:00:00
[ [ "Ballestrero", "A.", "" ], [ "Belhouari", "A.", "" ], [ "Bevilacqua", "G.", "" ], [ "Kashkan", "V.", "" ], [ "Maina", "E.", "" ] ]
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801.336
Guido Montagna Dr
G. Balossini, C. Bignamini, C.M. Carloni Calame, G. Montagna, O. Nicrosini and F. Piccinini
Photon pair production at flavour factories with per mille accuracy
11 pages, 5 figures, 1 table
Phys.Lett.B663:209-213,2008
10.1016/j.physletb.2008.04.007
FNT/T 2008/01, SHEP-08-05
hep-ph hep-ex
null
We present a high-precision QED calculation, with 0.1% theoretical accuracy, of two photon production in $e^+ e^-$ annihilation, as required by more and more accurate luminosity monitoring at flavour factories. The accuracy of the approach, which is based on the matching of exact next-to-leading order corrections with a QED Parton Shower algorithm, is demonstrated through a detailed analysis of the impact of the various sources of radiative corrections to the experimentally relevant observables. The calculation is implemented in the latest version of the event generator BabaYaga, available for precision simulations of photon pair production at $e^+ e^-$ colliders of moderately high energies.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:11:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Balossini", "G.", "" ], [ "Bignamini", "C.", "" ], [ "Calame", "C. M. Carloni", "" ], [ "Montagna", "G.", "" ], [ "Nicrosini", "O.", "" ], [ "Piccinini", "F.", "" ] ]
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801.3361
Michael Buchoff
Paulo F. Bedaque, Michael I. Buchoff, Brian C. Tiburzi, Andre Walker-Loud
Broken Symmetries from Minimally Doubled Fermions
13 pages, 3 figures, published version, analysis reorganized and condensed
Phys.Lett.B662:449-455,2008
10.1016/j.physletb.2008.03.034
UMD-40762-406
hep-lat hep-ph nucl-th
null
Novel chirally symmetric fermion actions containing the minimum amount of fermion doubling have been recently proposed in the literature. We study the symmetries and renormalization of these actions and find that in each case, discrete symmetries, such as parity and time-reversal, are explicitly broken. Consequently, when the gauge interactions are included, these theories radiatively generate relevant and marginal operators. Thus the restoration of these symmetries and the approach to the continuum limit require the fine-tuning of several parameters. With some assumptions, we show that this behavior is unavoidable for actions displaying minimal fermion doubling.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 20:18:14 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 20:17:28 GMT" }, { "version": "v3", "created": "Mon, 21 Apr 2008 15:36:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Bedaque", "Paulo F.", "" ], [ "Buchoff", "Michael I.", "" ], [ "Tiburzi", "Brian C.", "" ], [ "Walker-Loud", "Andre", "" ] ]
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801.3362
Sophie Schlunk
Sophie Schlunk, Adela Marian, Wieland Schoellkopf, Gerard Meijer
AC electric trapping of neutral atoms
10 pages, 13 figures, updated version, added journal reference
Phys. Rev. A 77, 043408 (2008)
10.1103/PhysRevA.77.043408
null
physics.atom-ph
null
We study the dynamic behavior of ultracold neutral atoms in a macroscopic ac electric trap. Confinement in such a trap is achieved by switching between two saddle-point configurations of the electric field. The gradual formation of a stably trapped cloud is observed and the trap performance is studied versus the switching frequency and the symmetry of the switching cycle. Additionally, the electric field in the trap is mapped out by imaging the atom cloud while the fields are still on. Finally, the phase-space acceptance of the trap is probed by introducing a modified switching cycle. The experimental results are reproduced using full three-dimensional trajectory calculations.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:37:14 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 15:33:59 GMT" } ]
2008-04-14T00:00:00
[ [ "Schlunk", "Sophie", "" ], [ "Marian", "Adela", "" ], [ "Schoellkopf", "Wieland", "" ], [ "Meijer", "Gerard", "" ] ]
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801.3363
Daniel Neumaier
D. Neumaier, K. Wagner, U. Wurstbauer, M. Reinwald, W. Wegscheider and D. Weiss
Phase coherent transport in (Ga,Mn)As
22 pages, 10 figures
null
10.1088/1367-2630/10/5/055016
null
cond-mat.mes-hall
null
Quantum interference effects and resulting quantum corrections of the conductivity have been intensively studied in disordered conductors over the last decades. The knowledge of phase coherence lengths and underlying dephasing mechanisms are crucial to understand quantum corrections to the resistivity in the different material systems. Due to the internal magnetic field and the associated breaking of time-reversal symmetry quantum interference effects in ferromagnetic materials have been scarcely explored. Below we describe the investigation of phase coherent transport phenomena in the newly discovered ferromagnetic semiconductor (Ga,Mn)As. We explore universal conductance fluctuations in mesoscopic (Ga,Mn)As wires and rings, the Aharonov-Bohm effect in nanoscale rings and weak localization in arrays of wires, made of the ferromagnetic semiconductor material. The experiments allow to probe the phase coherence length L_phi and the spin flip length L_SO as well as the temperature dependence of dephasing.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:39:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Neumaier", "D.", "" ], [ "Wagner", "K.", "" ], [ "Wurstbauer", "U.", "" ], [ "Reinwald", "M.", "" ], [ "Wegscheider", "W.", "" ], [ "Weiss", "D.", "" ] ]
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801.3364
Mike Scherfner
M. Plaue, M. Scherfner, L.A.M. de Sousa Jr
On Spacetimes with Given Kinematical Invariants: Construction and Examples
null
null
null
null
gr-qc
null
We present a useful method for the construction of cosmological models by solving the differential equations arising from calculating the kinematical invariants (shear, rotation, expansion and acceleration) of an observer field in proper time description. As an application of our method we present two generalizations of the G\"odel spacetime that follow naturally from our approach.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:40:38 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 13:24:40 GMT" } ]
2008-01-24T00:00:00
[ [ "Plaue", "M.", "" ], [ "Scherfner", "M.", "" ], [ "Sousa", "L. A. M. de", "Jr" ] ]
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801.3365
Giuseppe Ruzzi
Romeo Brunetti, Giuseppe Ruzzi
Quantum charges and spacetime topology: The emergence of new superselection sectors
null
Commun.Math.Phys.287:523-563,2009
10.1007/s00220-008-0671-6
null
math-ph gr-qc hep-th math.MP
null
In which is developed a new form of superselection sectors of topological origin. By that it is meant a new investigation that includes several extensions of the traditional framework of Doplicher, Haag and Roberts in local quantum theories. At first we generalize the notion of representations of nets of C*-algebras, then we provide a brand new view on selection criteria by adopting one with a strong topological flavour. We prove that it is coherent with the older point of view, hence a clue to a genuine extension. In this light, we extend Roberts' cohomological analysis to the case where 1--cocycles bear non trivial unitary representations of the fundamental group of the spacetime, equivalently of its Cauchy surface in case of global hyperbolicity. A crucial tool is a notion of group von Neumann algebras generated by the 1-cocycles evaluated on loops over fixed regions. One proves that these group von Neumann algebras are localized at the bounded region where loops start and end and to be factorial of finite type I. All that amounts to a new invariant, in a topological sense, which can be defined as the dimension of the factor. We prove that any 1-cocycle can be factorized into a part that contains only the charge content and another where only the topological information is stored. This second part resembles much what in literature are known as geometric phases. Indeed, by the very geometrical origin of the 1-cocycles that we discuss in the paper, they are essential tools in the theory of net bundles, and the topological part is related to their holonomy content. At the end we prove the existence of net representations.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 14:00:42 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 12:02:49 GMT" } ]
2009-03-20T00:00:00
[ [ "Brunetti", "Romeo", "" ], [ "Ruzzi", "Giuseppe", "" ] ]
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801.3366
Bulent Yilmaz
B. Yilmaz, S. Ayik, Y. Abe, and D. Boilley
Non-Markovian diffusion over a parabolic potential barrier: influence of the friction-memory function
20 pages, 12 figures, accepted to PRE
Phys. Rev. E 77, 011121 (2008).
10.1103/PhysRevE.77.011121
null
cond-mat.stat-mech cond-mat.other
null
The over-passing probability across an inverted parabolic potential barrier is investigated according to the classical and quantal generalized Langevin equations. It is shown that, in the classical case, the asymptotic value of the over-passing probability is determined by a single dominant root of the "characteristic function", and it is given by a simple expression. The expression for the over-passing probability is quite general, and details of dissipation mechanism and memory effects enter into the expression only through the dominant root of the characteristic equation.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:47:43 GMT" } ]
2008-01-23T00:00:00
[ [ "Yilmaz", "B.", "" ], [ "Ayik", "S.", "" ], [ "Abe", "Y.", "" ], [ "Boilley", "D.", "" ] ]
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801.3367
Remon Cornelisse
Remon Cornelisse, Jorge Casares, Teo Munoz-Darias, Danny Steeghs, Phil Charles, Rob Hynes, Kieran O'Brien
An Overview of the Bowen Survey; detecting donor star signatures in Low Mass X-ray Binaries
5 pages, 3 figures, Proceedings of "A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments", St. Petersburg Beach, Florida, USA, 28 October - 2 November, 2007
AIP Conf.Proc.1010:148-152,2008
10.1063/1.2945024
null
astro-ph
null
In this paper we give a review of the Bowen fluorescence survey, showing that narrow emission lines (mainly NIII and CIII lines between 4630 and 4660 A) appear to be universally present in the Bowen blend of optically bright low mass X-ray binaries. These narrow lines are attributed to reprocessing in the companion star giving the first estimates of K_2, and thereby providing the first constraints on their system parameters. We will give an overview of the constraints on the masses of the compact objects and briefly highlight the most important results of the survey. Furthermore, we will point out the most promising systems for future follow-up studies and indicate how we think their estimates of the component masses can be improved.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:49:10 GMT" } ]
2009-06-23T00:00:00
[ [ "Cornelisse", "Remon", "" ], [ "Casares", "Jorge", "" ], [ "Munoz-Darias", "Teo", "" ], [ "Steeghs", "Danny", "" ], [ "Charles", "Phil", "" ], [ "Hynes", "Rob", "" ], [ "O'Brien", "Kieran", "" ] ]
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801.3368
Nakia Carlevaro
Nakia Carlevaro and Giovanni Montani
On the Role of Viscosity in Early Cosmology
4 pages, no figure
Int. J. Mod. Phys. A 23, 1248-1252 (2008)
10.1142/S0217751X08040160
null
gr-qc astro-ph
null
We present a discussion of the effects induced by bulk viscosity on the very early Universe stability. The viscosity coefficient is assumed to be related to the energy density $\rho$ via a power-law of the form $\zeta=\zeta_0 \rho^s$ (where $\zeta_0, s=const.$) and the behavior of the density contrast in analyzed. In particular, we study both Einstein and hydrodynamic equations up to first and second order in time in the so-called quasi-isotropic collapsing picture near the cosmological singularity. As a result, we get a power-law solution existing only in correspondence to a restricted domain of $\zeta_0$. The particular case of pure isotropic FRW dynamics is then analyzed and we show how the asymptotic approach to the initial singularity admits an unstable collapsing picture.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:55:18 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 10:36:22 GMT" }, { "version": "v3", "created": "Tue, 15 Apr 2008 09:48:43 GMT" }, { "version": "v4", "created": "Thu, 24 Apr 2008 10:00:11 GMT" } ]
2009-03-24T00:00:00
[ [ "Carlevaro", "Nakia", "" ], [ "Montani", "Giovanni", "" ] ]
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801.3369
Dr. Badam Singh Kushvah
Badam Singh Kushvah (Gwalior Engineering College Airport Road, Maharajpura, Gwalior (M.P.)INDIA)
The Effect of Radiation Pressure on the Equilibrium Points in the Generalised Photogravitational Restricted Three Body Problem
null
Astrophysics and Space Science, Volume 315, Numbers 1-4 / June, 2008
10.1007/s10509-008-9823-6
null
math.DS
null
The existence of equilibrium points and the effect of radiation pressure have been discussed numerically. The problem is generalized by considering bigger primary as a source of radiation and small primary as an oblate spheroid. We have also discussed the Poynting-Robertson(P-R) effect which is caused due to radiation pressure. It is found that the collinear points $L_1,L_2,L_3$ deviate from the axis joining the two primaries, while the triangular points $L_4,L_5$ are not symmetrical due to radiation pressure. We have seen that $L_1,L_2,L_3$ are linearly unstable while $L_4,L_5$ are conditionally stable in the sense of Lyapunov when P-R effect is not considered. We have found that the effect of radiation pressure reduces the linear stability zones while P-R effect induces an instability in the sense of Lyapunov.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 13:59:14 GMT" }, { "version": "v2", "created": "Fri, 16 May 2008 12:04:45 GMT" } ]
2009-02-08T00:00:00
[ [ "Kushvah", "Badam Singh", "", "Gwalior Engineering College Airport Road,\n Maharajpura, Gwalior" ] ]
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801.337
Richard Durrett
Richard Durrett, Mateo Restrepo
One-dimensional stepping stone models, sardine genetics and Brownian local time
Published in at http://dx.doi.org/10.1214/07-AAP451 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Probability 2008, Vol. 18, No. 1, 334-358
10.1214/07-AAP451
IMS-AAP-AAP451
math.PR
null
Consider a one-dimensional stepping stone model with colonies of size $M$ and per-generation migration probability $\nu$, or a voter model on $\mathbb{Z}$ in which interactions occur over a distance of order $K$. Sample one individual at the origin and one at $L$. We show that if $M\nu/L$ and $L/K^2$ converge to positive finite limits, then the genealogy of the sample converges to a pair of Brownian motions that coalesce after the local time of their difference exceeds an independent exponentially distributed random variable. The computation of the distribution of the coalescence time leads to a one-dimensional parabolic differential equation with an interesting boundary condition at 0.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 14:00:41 GMT" } ]
2008-01-28T00:00:00
[ [ "Durrett", "Richard", "" ], [ "Restrepo", "Mateo", "" ] ]
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801.3371
Zhuan Xu
X. F. Xu, Z. A. Xu, T. J. Liu, D. Fobes, Z. Q. Mao, J. L. Luo, Y. Liu
Band-dependent normal-state coherence in Sr$_{2}$RuO$_{4}$: Evidence from Nernst effect and thermopower measurements
4 pages, 4 figures; added figures, revised content; accepted by PRL
Phys. Rev. Lett. 101, 057002 (2008)
10.1103/PhysRevLett.101.057002
null
cond-mat.str-el cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the first measurement on Nernst effect in the normal state of odd-parity, spin-triplet superconductor Sr$_{2}$RuO$_{4}$. Below 100 K, the Nernst signal was found to be negative, large, and, as a function of magnetic field, nonlinear. Its magnitude increases with the decreasing temperature until reaching a maximum around $T^*$ $\approx$ 20 - 25 K, below which it starts to decrease linearly as a function of temperature. The large value of the Nernst signal appears to be related to the multiband nature of the normal state and the nonlinearity to band-dependent magnetic fluctuation in Sr$_{2}$RuO$_{4}$. We argue that the sharp decrease in Nernst signal below $T^*$ is due to the suppression of quasiparticle scattering and the emergence of band-dependent coherence in the normal state. The observation of a sharp kink in the temperature dependent thermopower around $T^*$ and a sharp drop of Hall angle at low temperatures provide additional support to this picture.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 14:00:43 GMT" }, { "version": "v2", "created": "Sat, 5 Jul 2008 12:04:59 GMT" } ]
2008-07-31T00:00:00
[ [ "Xu", "X. F.", "" ], [ "Xu", "Z. A.", "" ], [ "Liu", "T. J.", "" ], [ "Fobes", "D.", "" ], [ "Mao", "Z. Q.", "" ], [ "Luo", "J. L.", "" ], [ "Liu", "Y.", "" ] ]
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801.3372
Laurent Jacques
Laurent Jacques and Christophe De Vleeschouwer (Communications and Remote Sensing Laboratory (TELE) Universit\'e catholique de Louvain (UCL), Belgium.)
A Geometrical Study of Matching Pursuit Parametrization
26 pages, 8 figures
null
10.1109/TSP.2008.917379
null
math.DG math.NA math.OC
null
This paper studies the effect of discretizing the parametrization of a dictionary used for Matching Pursuit decompositions of signals. Our approach relies on viewing the continuously parametrized dictionary as an embedded manifold in the signal space on which the tools of differential (Riemannian) geometry can be applied. The main contribution of this paper is twofold. First, we prove that if a discrete dictionary reaches a minimal density criterion, then the corresponding discrete MP (dMP) is equivalent in terms of convergence to a weakened hypothetical continuous MP. Interestingly, the corresponding weakness factor depends on a density measure of the discrete dictionary. Second, we show that the insertion of a simple geometric gradient ascent optimization on the atom dMP selection maintains the previous comparison but with a weakness factor at least two times closer to unity than without optimization. Finally, we present numerical experiments confirming our theoretical predictions for decomposition of signals and images on regular discretizations of dictionary parametrizations.
[ { "version": "v1", "created": "Tue, 22 Jan 2008 14:05:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Jacques", "Laurent", "", "Communications and\n Remote Sensing Laboratory" ], [ "De Vleeschouwer", "Christophe", "", "Communications and\n Remote Sensing Laboratory" ] ]
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