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712.0879
Diptiman Sen
Diptiman Sen, Michael Stone, Smitha Vishveshwara
Quasi-particle propagation in quantum Hall systems
16 pages including 4 figures; a more detailed and self-contained version of Phys. Rev. Lett. 99, 190401 (2007), arXiv:0705.0360; this is the final published version
Phys. Rev. B 77, 115442 (2008)
10.1103/PhysRevB.77.115442
null
cond-mat.mes-hall
null
We study various geometrical aspects of the propagation of particles obeying fractional statistics in the physical setting of the quantum Hall system. We find a discrete set of zeros for the two-particle kernel in the lowest Landau level; these arise from a combination of a two-particle Aharonov-Bohm effect and the exchange phase related to fractional statistics. The kernel also shows short distance exclusion statistics, for instance, in a power law behavior as a function of initial and final positions of the particles. We employ the one-particle kernel to compute impurity-mediated tunneling amplitudes between different edges of a finite-sized quantum Hall system and and find that they vanishes for certain strengths and locations of the impurity scattering potentials. We show that even in the absence of scattering, the correlation functions between different edges exhibits unusual features for a narrow enough Hall bar.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 06:25:26 GMT" }, { "version": "v2", "created": "Sat, 8 Dec 2007 04:25:14 GMT" }, { "version": "v3", "created": "Thu, 27 Mar 2008 06:50:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Sen", "Diptiman", "" ], [ "Stone", "Michael", "" ], [ "Vishveshwara", "Smitha", "" ] ]
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712.088
Prasanta K. Panigrahi
Priyam Das, Manan Vyas and Prasanta K Panigrahi
Loss of superfluidity in the Bose-Einstein condensate in an optical lattice with cubic and quintic nonlinearity
5 pages, 1 figure
J. Phys. B: At. Mol. Opt. Phys. 42 245304 (2009).
10.1088/0953-4075/42/24/245304
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a one-dimensional shallow optical lattice, in the presence of both cubic and quintic nonlinearity, a superfluid density wave is identified in a Bose-Einstein condensate. Interestingly, it ceases to exist when only one of these interactions is operative. We predict the loss of superfluidity through a classical dynamical phase transition, where modulational instability leads to the loss of phase coherence. In a certain parameter domain, the competition between lattice potential and the interactions is shown to give rise to a stripe phase, where atoms are confined in finite domains. In a pure two-body case, apart from the known superfluid and insulating phases, a density wave insulating phase is found to exist, possessing two frequency modulations commensurate with the lattice potential.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 06:35:00 GMT" }, { "version": "v2", "created": "Mon, 9 Jun 2008 04:33:43 GMT" }, { "version": "v3", "created": "Tue, 10 Jun 2008 04:47:08 GMT" }, { "version": "v4", "created": "Wed, 18 Mar 2009 06:59:58 GMT" }, { "version": "v5", "created": "Mon, 23 Nov 2009 10:20:14 GMT" }, { "version": "v6", "created": "Tue, 13 Apr 2010 10:19:55 GMT" } ]
2010-04-14T00:00:00
[ [ "Das", "Priyam", "" ], [ "Vyas", "Manan", "" ], [ "Panigrahi", "Prasanta K", "" ] ]
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712.0881
Hui Zou
Hui Zou, Trevor Hastie, Robert Tibshirani
On the "degrees of freedom" of the lasso
Published in at http://dx.doi.org/10.1214/009053607000000127 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2173-2192
10.1214/009053607000000127
IMS-AOS-AOS0248
math.ST stat.TH
null
We study the effective degrees of freedom of the lasso in the framework of Stein's unbiased risk estimation (SURE). We show that the number of nonzero coefficients is an unbiased estimate for the degrees of freedom of the lasso--a conclusion that requires no special assumption on the predictors. In addition, the unbiased estimator is shown to be asymptotically consistent. With these results on hand, various model selection criteria--$C_p$, AIC and BIC--are available, which, along with the LARS algorithm, provide a principled and efficient approach to obtaining the optimal lasso fit with the computational effort of a single ordinary least-squares fit.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 07:22:35 GMT" } ]
2007-12-18T00:00:00
[ [ "Zou", "Hui", "" ], [ "Hastie", "Trevor", "" ], [ "Tibshirani", "Robert", "" ] ]
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712.0882
Agata Fronczak
Piotr Fronczak, Agata Fronczak
Critical line in undirected Kauffman boolean networks - the role of percolation
submitted to Journal of Physics A, special issue "Complex networks"
J. Phys. A 41, 224009 (2008)
10.1088/1751-8113/41/22/224009
null
cond-mat.dis-nn cond-mat.stat-mech
null
We show that to correctly describe the position of the critical line in the Kauffman random boolean networks one must take into account percolation phenomena underlying the process of damage spreading. For this reason, since the issue of percolation transition is much simpler in random undirected networks, than in the directed ones, we study the Kauffman model in undirected networks. We derive the mean field formula for the critical line in the giant component of these networks, and show that the critical line characterizing the whole network results from the fact that the ordered behavior of small clusters shields the chaotic behavior of the giant component. We also show a possible attitude towards the analytical description of the shielding effect. The theoretical derivations given in this paper quite tally with numerical simulations done for classical random graphs.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 07:52:48 GMT" } ]
2015-05-13T00:00:00
[ [ "Fronczak", "Piotr", "" ], [ "Fronczak", "Agata", "" ] ]
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712.0883
Conrad Burden
C. J. Burden
Understanding the physics of oligonucleotide microarrays: the Affymetrix spike-in data reanalysed
32 pages, 13 figures, minor amendments
Phys. Biol. 5 (2008) 016004
10.1088/1478-3975/5/1/016004
null
q-bio.QM q-bio.BM
null
The Affymetrix U95 and U133 Latin Square spike-in datasets are reanalysed, together with a dataset from a version of the U95 spike-in experiment without a complex non-specific background. The approach uses a physico-chemical model which includes the effects the specific and non-specific hybridisation and probe folding at the microarray surface, target folding and hybridisation in the bulk RNA target solution, and duplex dissociation during the post-hybridisatoin washing phase. The model predicts a three parameter hyperbolic response function that fits well with fluorescence intensity data from all three datasets. The importance of the various hybridisation and washing effects in determining each of the three parameters is examined, and some guidance is given as to how a practical algorithm for determining specific target concentrations might be developed.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 02:11:19 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 14:50:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Burden", "C. J.", "" ] ]
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712.0884
Liping Fu
L. Fu, E. Semboloni, H. Hoekstra, M. Kilbinger, L. van Waerbeke, I. Tereno, Y. Mellier, C. Heymans, J. Coupon, K. Benabed, J. Benjamin, E. Bertin, O. Dor\'e, M. J. Hudson, O. Ilbert, R. Maoli, C. Marmo, H. J. McCracken, B. M\'enard
Very weak lensing in the CFHTLS Wide: Cosmology from cosmic shear in the linear regime
23 pages, 16 figures (A&A accepted)
Astron.Astrophys.479:9-25,2008
10.1051/0004-6361:20078522
null
astro-ph
null
We present an exploration of weak lensing by large-scale structure in the linear regime, using the third-year (T0003) CFHTLS Wide data release. Our results place tight constraints on the scaling of the amplitude of the matter power spectrum sigma_8 with the matter density Omega_m. Spanning 57 square degrees to i'_AB = 24.5 over three independent fields, the unprecedented contiguous area of this survey permits high signal-to-noise measurements of two-point shear statistics from 1 arcmin to 4 degrees. Understanding systematic errors in our analysis is vital in interpreting the results. We therefore demonstrate the percent-level accuracy of our method using STEP simulations, an E/B-mode decomposition of the data, and the star-galaxy cross correlation function. We also present a thorough analysis of the galaxy redshift distribution using redshift data from the CFHTLS T0003 Deep fields that probe the same spatial regions as the Wide fields. We find sigma_8(Omega_m/0.25)^0.64 = 0.785+-0.043 using the aperture-mass statistic for the full range of angular scales for an assumed flat cosmology, in excellent agreement with WMAP3 constraints. The largest physical scale probed by our analysis is 85 Mpc, assuming a mean redshift of lenses of 0.5 and a LCDM cosmology. This allows for the first time to constrain cosmology using only cosmic shear measurements in the linear regime. Using only angular scales theta> 85 arcmin, we find sigma_8(Omega_m/0.25)_lin^0.53 = 0.837+-0.084, which agree with the results from our full analysis. Combining our results with data from WMAP3, we find Omega_m=0.248+-0.019 and sigma_8 = 0.771+-0.029.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:45:56 GMT" } ]
2010-04-06T00:00:00
[ [ "Fu", "L.", "" ], [ "Semboloni", "E.", "" ], [ "Hoekstra", "H.", "" ], [ "Kilbinger", "M.", "" ], [ "van Waerbeke", "L.", "" ], [ "Tereno", "I.", "" ], [ "Mellier", "Y.", "" ], [ "Heymans", "C.", "" ], [ "Coupon", "J.", "" ], [ "Benabed", "K.", "" ], [ "Benjamin", "J.", "" ], [ "Bertin", "E.", "" ], [ "Doré", "O.", "" ], [ "Hudson", "M. J.", "" ], [ "Ilbert", "O.", "" ], [ "Maoli", "R.", "" ], [ "Marmo", "C.", "" ], [ "McCracken", "H. J.", "" ], [ "Ménard", "B.", "" ] ]
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712.0885
Georgii Shestakov
N.N. Achasov, G.N. Shestakov
Lightest scalar and tensor resonances in $\gamma\gamma\to\pi\pi$ after the Belle experiment
14 pages, 5 figures. Fitted for the publication in Physical Review D
Phys.Rev.D77:074020,2008
10.1103/PhysRevD.77.074020
null
hep-ph hep-ex nucl-th
null
New high statistics Belle data on the $\gamma\gamma\to\pi^+\pi^-$ reaction cross section measured in the range of pion-pair invariant masses $\sqrt{s}$ between 0.8 GeV and 1.5 GeV are analyzed to clarify the current situation around the $\sigma(600)$, $f_0(980)$, and $f_2(1270)$ resonances in $\gamma\gamma$ collisions. The present analysis shows that the direct coupling constants of the $\sigma(600)$ and $f_0(980)$ resonances to $\gamma\gamma$ are small, and the $\sigma(600)\to\gamma\gamma$ and $f_0(980)\to\gamma\gamma$ decays are four-quark transitions caused by the $\pi^+\pi^-$ and $K^+K^-$ loop mechanisms, respectively. The chiral shielding of the $\sigma(600)$ resonance takes place in the reactions $\gamma\gamma\to\pi\pi$ as well as in $\pi\pi$ scattering. Some results of a simultaneous description of the $\gamma\gamma\to\pi^+\pi^-$ and $\gamma\gamma\to\pi^0\pi^0$ Belle data are also presented. In particular, the following tentative estimate of the $f_2(1270)\to\gamma\gamma$ decay width is obtained: $\Gamma_{f_2\to\gamma\gamma}(m^2_{f_2})\approx 3.68$ keV.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:34:08 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 06:27:16 GMT" }, { "version": "v3", "created": "Mon, 28 Apr 2008 06:39:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Achasov", "N. N.", "" ], [ "Shestakov", "G. N.", "" ] ]
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712.0886
Harun Omer
Harun Omer
Towards Mirror Symmetry with Semi-Realistic Intersecting Brane Configurations
19 pages
JHEP 0901:032,2009
10.1088/1126-6708/2009/01/032
null
hep-th
null
A T6 orbifold compactification is discussed from the somewhat unconventional perspective as the large radius limit of a Landau-Ginzburg model. The features of the model are in principle familiar, but the way they enter here is different from the way they enter when using more commonly used methods. It is hoped that the point of view presented here can supplement the understanding of the features used in string compactifications, notably in terms of naturalness and completeness. More precisely, the analyzed T6 / Z_4 x Z_4 features two different kinds of O-planes, branes in the bulk as well as fractional branes, continuous and discrete Wilson lines as well as an orientifold action which can act in different ways on the Wilson lines. The D-branes are desribed by matrix factorizations. This work is also intended to be a showcase for the potentials of matrix factorizations which are for the first time geared to their full level of sophistication in this paper. Throughout the analyis everything is mapped from the B-model side of the LG-model to the A side by mirror symmetry. The work could be extended straightforwardly yet tediously to perform mirror symmetry on a general intersecting brane configuration and to compute Yukawa couplings. The analysis presented here can also be applied to non-toroidal backgrounds with an intersecting brane configuration on it, so I hope that it will be a helpful basis for later applications of mirror symmetry to models exhibiting real world properties.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 08:23:14 GMT" } ]
2009-02-12T00:00:00
[ [ "Omer", "Harun", "" ] ]
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712.0887
Ludovic Berthier
Pinaki Chaudhuri, Yongxiang Gao, Ludovic Berthier, Maria Kilfoil, Walter Kob
A random walk description of the heterogeneous glassy dynamics of attracting colloids
13 pages, 5 figs. Submitted to special issue "Classical and Quantum Glasses" of J. Phys.: Condens. Matter; v2: response to referee
J. Phys.: Condens. Matter 20, 244126 (2008)
10.1088/0953-8984/20/24/244126
null
cond-mat.soft cond-mat.stat-mech
null
We study the heterogeneous dynamics of attractive colloidal particles close to the gel transition using confocal microscopy experiments combined with a theoretical statistical analysis. We focus on single particle dynamics and show that the self part of the van Hove distribution function is not the Gaussian expected for a Fickian process, but that it reflects instead the existence, at any given time, of colloids with widely different mobilities. Our confocal microscopy measurements can be described well by a simple analytical model based on a conventional continuous time random walk picture, as already found in several other glassy materials. In particular, the theory successfully accounts for the presence of broad tails in the van Hove distributions that exhibit exponential, rather than Gaussian, decay at large distance.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 08:24:02 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 09:35:26 GMT" } ]
2009-08-25T00:00:00
[ [ "Chaudhuri", "Pinaki", "" ], [ "Gao", "Yongxiang", "" ], [ "Berthier", "Ludovic", "" ], [ "Kilfoil", "Maria", "" ], [ "Kob", "Walter", "" ] ]
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712.0888
Sergei Rubin
K.A. Bronnikov, S.G. Rubin
Abilities of multidimensional gravity
6 pages, 3 figures
Grav.Cosmol.13:253,2007
null
null
gr-qc
null
We show that a number of problems of modern cosmology may be addressed and solved in the framework of multidimensional gravity with high-order curvature invariants, without invoking other fields. As applications of this approach, we mention primordial inflation and particle production after it; description of the modern accelerated stage of the Universe with stable compact extra dimensions; construction of asymmetric thick brane-world models.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 08:33:05 GMT" }, { "version": "v2", "created": "Sat, 22 Dec 2007 11:31:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Bronnikov", "K. A.", "" ], [ "Rubin", "S. G.", "" ] ]
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712.0889
Francois Mignard
F. Mignard, C. Bailer-Jones, U. Bastian, R. Drimmel, L. Eyer, D. Katz, F. van Leeuwen, X. Luri, W. O'Mullane, X. Passot, D. Pourbaix and T. Prusti
Gaia: Organisation and challenges for the data processing
7 pages, 2 figures, Proceedings of IAU Symp. 248
null
10.1017/S1743921308019145
null
astro-ph
null
Gaia is an ambitious space astrometry mission of ESA with a main objective to map the sky in astrometry and photometry down to a magnitude 20 by the end of the next decade. While the mission is built and operated by ESA and an industrial consortium, the data processing is entrusted to a consortium formed by the scientific community, which was formed in 2006 and formally selected by ESA one year later. The satellite will downlink around 100 TB of raw telemetry data over a mission duration of 5 years from which a very complex iterative processing will lead to the final science output: astrometry with a final accuracy of a few tens of microarcseconds, epoch photometry in wide and narrow bands, radial velocity and spectra for the stars brighter than 17 mag. We discuss the general principles and main difficulties of this very large data processing and present the organisation of the European Consortium responsible for its design and implementation.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 08:36:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Mignard", "F.", "" ], [ "Bailer-Jones", "C.", "" ], [ "Bastian", "U.", "" ], [ "Drimmel", "R.", "" ], [ "Eyer", "L.", "" ], [ "Katz", "D.", "" ], [ "van Leeuwen", "F.", "" ], [ "Luri", "X.", "" ], [ "O'Mullane", "W.", "" ], [ "Passot", "X.", "" ], [ "Pourbaix", "D.", "" ], [ "Prusti", "T.", "" ] ]
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712.089
Marino Gran
Francis Borceux, Marino Gran, Sandra Mantovani
On closure operators and reflections in Goursat categories
14 pages. Accepted for publication in "Rendiconti dell'Istituto Matematico di Trieste"
Rendiconti dell'Istituto Matematico di Trieste,Vol. 39 (2007) 87-104
null
null
math.CT
null
By defining a closure operator on effective equivalence relations in a regular category $C$, it is possible to establish a bijective correspondence between these closure operators and the regular epireflective subcategories $L$ of $C$. When $C$ is an exact Goursat category this correspondence restricts to a bijection between the Birkhoff closure operators on effective equivalence relations and the Birkhoff subcategories of $C$. In this case it is possible to provide an explicit description of the closure, and to characterise the congruence distributive Goursat categories.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 08:43:24 GMT" } ]
2016-01-06T00:00:00
[ [ "Borceux", "Francis", "" ], [ "Gran", "Marino", "" ], [ "Mantovani", "Sandra", "" ] ]
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712.0891
Taras Fityo Dr
Taras Fityo
Statistical physics in deformed spaces with minimal length
16 pages, 2 figures; several mistakes are corrected
Phys. Lett. A 372, 5872-5877 (2008)
10.1016/j.physleta.2008.07.047
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We considered the thermodynamics in spaces with deformed commutation relation leading to existence of the minimal length. We developed a classical method of the partition function evaluation. We calculated the partition function and heat capacity for ideal gas and harmonic oscillators using this method. The obtained results are in good agreement with the exact quantum ones. We also showed that the minimal length introduction reduces degrees of freedom of an arbitrary system in the high temperature limit significantly.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 09:05:31 GMT" }, { "version": "v2", "created": "Wed, 27 Aug 2008 17:25:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Fityo", "Taras", "" ] ]
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712.0892
Bing Li
Bing Li, Xiangrong Yin
On surrogate dimension reduction for measurement error regression: An invariance law
Published in at http://dx.doi.org/10.1214/009053607000000172 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2143-2172
10.1214/009053607000000172
IMS-AOS-AOS0263
math.ST stat.TH
null
We consider a general nonlinear regression problem where the predictors contain measurement error. It has been recently discovered that several well-known dimension reduction methods, such as OLS, SIR and pHd, can be performed on the surrogate regression problem to produce consistent estimates for the original regression problem involving the unobserved true predictor. In this paper we establish a general invariance law between the surrogate and the original dimension reduction spaces, which implies that, at least at the population level, the two dimension reduction problems are in fact equivalent. Consequently we can apply all existing dimension reduction methods to measurement error regression problems. The equivalence holds exactly for multivariate normal predictors, and approximately for arbitrary predictors. We also characterize the rate of convergence for the surrogate dimension reduction estimators. Finally, we apply several dimension reduction methods to real and simulated data sets involving measurement error to compare their performances.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 09:06:20 GMT" } ]
2009-09-29T00:00:00
[ [ "Li", "Bing", "" ], [ "Yin", "Xiangrong", "" ] ]
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712.0893
Lukasz Machura
M. Kostur, L. Machura, P. Talkner, P. Hanggi, J. Luczka
Anomalous transport in biased ac-driven Josephson junctions: Negative conductances
7 pages, 5 figures
Phys. Rev. B 77 104509 (2008)
10.1103/PhysRevB.77.104509
null
cond-mat.supr-con
null
We investigate classical anomalous electrical transport in a driven, resistively and capacitively shunted Josephson junction device. Novel transport phenomena are identified in chaotic regimes when the junction is subjected to both, a time periodic (ac) and a constant, biasing (dc) current. The dependence of the voltage across the junction on the dc-current exhibits a rich diversity of anomalous transport characteristics: In particular, depending on the chosen parameter regime we can identify so termed absolute negative conductance around zero dc-bias, the occurrence of negative differential conductance and, after crossing a zero conductance, the emergence of a negative nonlinear conductance in the non-equilibrium response regime remote from zero dc-bias.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 09:06:40 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 10:21:13 GMT" } ]
2008-03-25T00:00:00
[ [ "Kostur", "M.", "" ], [ "Machura", "L.", "" ], [ "Talkner", "P.", "" ], [ "Hanggi", "P.", "" ], [ "Luczka", "J.", "" ] ]
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712.0894
Leila Mohammadi
Franz Merkl, Leila Mohammadi
Optimal third root asymptotic bounds in the statistical estimation of thresholds
Published in at http://dx.doi.org/10.1214/009053607000000325 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2193-2218
10.1214/009053607000000325
IMS-AOS-AOS0271
math.ST stat.TH
null
This paper is concerned with estimating the intersection point of two densities, given a sample of both of the densities. This problem arises in classification theory. The main results provide lower bounds for the probability of the estimation errors to be large on a scale determined by the inverse cube root of the sample size. As corollaries, we obtain probabilistic bounds for the prediction error in a classification problem. The key to the proof is an entropy estimate. The lower bounds are based on bounds for general estimators, which are applicable in other contexts as well. Furthermore, we introduce a class of optimal estimators whose errors asymptotically meet the border permitted by the lower bounds.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 09:33:04 GMT" } ]
2007-12-18T00:00:00
[ [ "Merkl", "Franz", "" ], [ "Mohammadi", "Leila", "" ] ]
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712.0895
Ariel Amir
Ariel Amir, Yuval Oreg, Yoseph Imry
A mean-field model for the electron glass dynamics
null
Phys. Rev. B 77, 165207 (2008)
10.1103/PhysRevB.77.165207
null
cond-mat.dis-nn
null
We study a microscopic mean-field model for the dynamics of the electron glass, near a local equilibrium state. Phonon-induced tunneling processes are responsible for generating transitions between localized electronic sites, which eventually lead to the thermalization of the system. We find that the decay of an excited state to a locally stable state is far from being exponential in time, and does not have a characteristic time scale. Working in a mean-field approximation, we write rate equations for the average occupation numbers, and describe the return to the locally stable state using the eigenvalues of a rate matrix, A, describing the linearized time-evolution of the occupation numbers. Analyzing the probability distribution of the eigenvalues of A we find that, under certain physically reasonable assumptions, it takes the form $P(\lambda) \sim \frac{1}{|\lambda|}$, leading naturally to a logarithmic decay in time. While our derivation of the matrix A is specific for the chosen model, we expect that other glassy systems, with different microscopic characteristics, will be described by random rate matrices belonging to the same universality class of A. Namely, the rate matrix has elements with a very broad distribution, i.e., exponentials of a variable with nearly uniform distribution.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 09:34:12 GMT" } ]
2009-11-30T00:00:00
[ [ "Amir", "Ariel", "" ], [ "Oreg", "Yuval", "" ], [ "Imry", "Yoseph", "" ] ]
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712.0896
Paolo Perinotti Dr.
Giacomo M. D'Ariano, Rafal Demkowicz-Dobrzanski, Paolo Perinotti, and Massimiliano F. Sacchi
Quantum state decorrelation
11 pages, 2 figures, RevTex4
Phys. Rev. A 77, 032344 (2008)
10.1103/PhysRevA.77.032344
null
quant-ph
null
We address the general problem of removing correlations from quantum states while preserving local quantum information as much as possible. We provide a complete solution in the case of two qubits, by evaluating the minimum amount of noise that is necessary to decorrelate covariant sets of bipartite states. We show that two harmonic oscillators in arbitrary Gaussian state can be decorrelated by a Gaussian covariant map. Finally, for finite-dimensional Hilbert spaces, we prove that states obtained from most cloning channels (e.g., universal and phase-covariant cloning) can be decorrelated only at the expense of a complete erasure of information about the copied state. More generally, in finite dimension, cloning without correlations is impossible for continuous sets of states. On the contrary, for continuos variables cloning, a slight modification of the customary set-up for cloning coherent states allows one to obtain clones without correlations.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 09:51:44 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 12:03:54 GMT" } ]
2008-04-02T00:00:00
[ [ "D'Ariano", "Giacomo M.", "" ], [ "Demkowicz-Dobrzanski", "Rafal", "" ], [ "Perinotti", "Paolo", "" ], [ "Sacchi", "Massimiliano F.", "" ] ]
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712.0897
Jun Cao
Jun Cao
Reactor Neutrino Experiments
14 pages, 18 figures, prepared for XXIII International Symposium on Lepton and Photon Interactions at High Energy (LP07), 13-18 Aug 2007, Daegu, Korea
null
null
null
hep-ex
null
Precisely measuring $\theta_{13}$ is one of the highest priority in neutrino oscillation study. Reactor experiments can cleanly determine $\theta_{13}$. Past reactor neutrino experiments are reviewed and status of next precision $\theta_{13}$ experiments are presented. Daya Bay is designed to measure $\sin^22\theta_{13}$ to better than 0.01 and Double Chooz and RENO are designed to measure it to 0.02-0.03. All are heading to full operation in 2010. Recent improvements in neutrino moment measurement are also briefed.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 09:54:23 GMT" } ]
2007-12-07T00:00:00
[ [ "Cao", "Jun", "" ] ]
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712.0898
M. Levine
Lawrence D. Brown, M. Levine
Variance estimation in nonparametric regression via the difference sequence method
Published in at http://dx.doi.org/10.1214/009053607000000145 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2219-2232
10.1214/009053607000000145
IMS-AOS-AOS0252
math.ST stat.TH
null
Consider a Gaussian nonparametric regression problem having both an unknown mean function and unknown variance function. This article presents a class of difference-based kernel estimators for the variance function. Optimal convergence rates that are uniform over broad functional classes and bandwidths are fully characterized, and asymptotic normality is also established. We also show that for suitable asymptotic formulations our estimators achieve the minimax rate.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 09:57:53 GMT" } ]
2009-09-29T00:00:00
[ [ "Brown", "Lawrence D.", "" ], [ "Levine", "M.", "" ] ]
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712.0899
Uwe Wolter
U. Wolter, J. Robrade, J. H. M. M. Schmitt and J. U. Ness
Doppler imaging an X-ray flare on the ultrafast rotator BO Mic - A contemporaneous multiwavelength study using XMM-Newton and VLT
Accepted by A&A
null
10.1051/0004-6361:20078838
null
astro-ph
null
We present an analysis of contemporaneous photospheric, chromospheric and coronal structures on the highly active K-dwarf star BO Mic (Speedy Mic). We localize a moderate flare in the stellar atmosphere and study its energetics, size and thermal behaviour. The analysis is based on strictly simultaneous X-ray, UV- and optical observations carried out by XMM-Newton and the VLT. We use Doppler imaging and related methods for the localization of features. Based on X-ray spectroscopy we study the the coronal plasma in and outside the flare. The flare emits in X-rays and UV, but is not detected in white light; it is located at intermediate latitude between an extended spot group and the weakly spotted pole. We estimate its height below 0.4 stellar radii making it clearly distinct in longitude and height from the prominences found about two stellar radii above the surface. While BO Mic's photospheric brightness is modulated due to extended starspots, neither the chromospheric nor the X-ray emission show a pronounced rotational modulation.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:01:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Wolter", "U.", "" ], [ "Robrade", "J.", "" ], [ "Schmitt", "J. H. M. M.", "" ], [ "Ness", "J. U.", "" ] ]
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712.09
Laurent Chevillard
L. Chevillard, C. Meneveau, L. Biferale, F. Toschi
Modeling the pressure Hessian and viscous Laplacian in Turbulence: comparisons with DNS and implications on velocity gradient dynamics
16 pages, 10 figures, minor revisions, final version published in Phys. Fluids
Phys. Fluids 20, 101504 (2008)
10.1063/1.3005832
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modeling the velocity gradient tensor A along Lagrangian trajectories in turbulent flow requires closures for the pressure Hessian and viscous Laplacian of A. Based on an Eulerian-Lagrangian change of variables and the so-called Recent Fluid Deformation closure, such models were proposed recently. The resulting stochastic model was shown to reproduce many geometric and anomalous scaling properties of turbulence. In this work, direct comparisons between model predictions and Direct Numerical Simulation (DNS) data are presented. First, statistical properties of A are described using conditional averages of strain skewness, enstrophy production, energy transfer and vorticity alignments, conditioned upon invariants of A. These conditionally averaged quantities are found to be described accurately by the stochastic model. More detailed comparisons that focus directly on the terms being modeled in the closures are also presented. Specifically, conditional statistics associated with the pressure Hessian and the viscous Laplacian are measured from the model and are compared with DNS. Good agreement is found in strain-dominated regions. However, some features of the pressure Hessian linked to rotation dominated regions are not reproduced accurately by the model. Geometric properties such as vorticity alignment with respect to principal axes of the pressure Hessian are mostly predicted well. In particular, the model predicts that an eigenvector of the rate-of-strain will be also an eigenvector of the pressure Hessian, in accord to basic properties of the Euler equations. The analysis identifies under what conditions the Eulerian-Lagrangian change of variables with the Recent Fluid Deformation closure works well, and in which flow regimes it requires further improvements.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:06:06 GMT" }, { "version": "v2", "created": "Tue, 11 Nov 2008 21:05:17 GMT" } ]
2008-11-11T00:00:00
[ [ "Chevillard", "L.", "" ], [ "Meneveau", "C.", "" ], [ "Biferale", "L.", "" ], [ "Toschi", "F.", "" ] ]
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712.0901
Jiming Jiang
Jiming Jiang, Yihui Luan, You-Gan Wang
Iterative estimating equations: Linear convergence and asymptotic properties
Published in at http://dx.doi.org/10.1214/009053607000000208 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2233-2260
10.1214/009053607000000208
IMS-AOS-AOS0264
math.ST stat.TH
null
We propose an iterative estimating equations procedure for analysis of longitudinal data. We show that, under very mild conditions, the probability that the procedure converges at an exponential rate tends to one as the sample size increases to infinity. Furthermore, we show that the limiting estimator is consistent and asymptotically efficient, as expected. The method applies to semiparametric regression models with unspecified covariances among the observations. In the special case of linear models, the procedure reduces to iterative reweighted least squares. Finite sample performance of the procedure is studied by simulations, and compared with other methods. A numerical example from a medical study is considered to illustrate the application of the method.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:24:50 GMT" } ]
2007-12-18T00:00:00
[ [ "Jiang", "Jiming", "" ], [ "Luan", "Yihui", "" ], [ "Wang", "You-Gan", "" ] ]
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712.0902
Keisuke Izumi
Keisuke Izumi
Orthogonal black di-ring solution
13 pages, 5 figures,
Prog.Theor.Phys.119:757-774,2008
10.1143/PTP.119.757
KUNS-2113
hep-th gr-qc
null
We construct a five dimensional exact solution of the orthogonal black di-ring which has two black rings whose $S^1$-rotating planes are orthogonal. This solution has four free parameters which represent radii of and speeds of $S^1$-rotation of the black rings. We use the inverse scattering method. This method needs the seed metric. We also present a systematic method how to construct a seed metric. Using this method, we can probably construct other solutions having many black rings on the two orthogonal planes with or without a black hole at the center.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:28:59 GMT" }, { "version": "v2", "created": "Sun, 9 Dec 2007 11:51:40 GMT" }, { "version": "v3", "created": "Sun, 6 Jan 2008 09:11:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Izumi", "Keisuke", "" ] ]
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712.0903
Cecilia Jarlskog
C. Jarlskog
Neutrino Sector with Majorana Mass Terms and Friedberg-Lee Symmetry
null
Phys.Rev.D77:073002,2008
10.1103/PhysRevD.77.073002
null
hep-ph
null
We examine a recently proposed symmetry/condition by Friedberg and Lee in the framework where three right-handed neutrinos are added to the spectrum of the three-family Minimal Standard Model. It is found that the right-handed neutrinos are very special, with respect to this symmetry. In the symmetry limit the neutrinos are massless and that may be a hint about why they are light. Imposed as a condition and not as a full symmetry, we find that one of the three right-handed neutrinos simply decouples (has only gravitational interactions) and that there is a massless interacting neutrino. The possible relation of the model to the see-saw mechanism is briefly discussed.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:29:23 GMT" } ]
2008-11-26T00:00:00
[ [ "Jarlskog", "C.", "" ] ]
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712.0904
Felix Abramovich
Felix Abramovich, Vadim Grinshtein, Marianna Pensky
On optimality of Bayesian testimation in the normal means problem
Published in at http://dx.doi.org/10.1214/009053607000000226 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2261-2286
10.1214/009053607000000226
IMS-AOS-AOS0254
math.ST stat.TH
null
We consider a problem of recovering a high-dimensional vector $\mu$ observed in white noise, where the unknown vector $\mu$ is assumed to be sparse. The objective of the paper is to develop a Bayesian formalism which gives rise to a family of $l_0$-type penalties. The penalties are associated with various choices of the prior distributions $\pi_n(\cdot)$ on the number of nonzero entries of $\mu$ and, hence, are easy to interpret. The resulting Bayesian estimators lead to a general thresholding rule which accommodates many of the known thresholding and model selection procedures as particular cases corresponding to specific choices of $\pi_n(\cdot)$. Furthermore, they achieve optimality in a rather general setting under very mild conditions on the prior. We also specify the class of priors $\pi_n(\cdot)$ for which the resulting estimator is adaptively optimal (in the minimax sense) for a wide range of sparse sequences and consider several examples of such priors.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:50:15 GMT" } ]
2007-12-18T00:00:00
[ [ "Abramovich", "Felix", "" ], [ "Grinshtein", "Vadim", "" ], [ "Pensky", "Marianna", "" ] ]
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712.0905
Michael Kreissl
Michael Kreissl and Wolfgang Nolting
Two-band ferromagnetic Kondo-lattice model for local-moment half-metals
10 pages, 5 figures, submitted to Journal of Physics: Condensed Matter
J. Phys.: Condens. Matter 20 035222 (2008)
10.1088/0953-8984/20/03/035222
null
cond-mat.str-el
null
We introduce a two-band Kondo-lattice model to describe ferromagnetic half-metals with local magnetic moments. In a model study, the electronic and magnetic properties are presented by temperature dependent magnetization curves, band-structures, spin polarizations and plasma frequencies. These are obtained from numerically evaluated equations, based on the single-electron Green functions. We show that the mutual influence between the itinerant electrons and the local magnetic moments is responsible for several phase transitions of the half-metals, namely first and second order magnetic phase transitions, as well as half-metal to semiconductor and half-metal to semimetal transitions.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:51:07 GMT" } ]
2011-11-10T00:00:00
[ [ "Kreissl", "Michael", "" ], [ "Nolting", "Wolfgang", "" ] ]
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712.0906
Miriam Giorgini
Giorgio Giacomelli (Dipartimento di Fisica dell'Universita' di Bologna and INFN Sezione di Bologna)
Rising Total Hadron-Hadron Cross Sections
10 pages, 7 eps figures. Talk given in honour of George T. Zatsepin
null
null
null
hep-ex
null
A historical summary is made on the measurements concerning the rising total hadron-hadron cross sections at high energies. The first part of this paper concerns the total cross section measurements performed at the Brookhaven, Serpukhov and Fermilab fixed target accelerators; then the measurements at the CERN Intersecting Storage Rings (ISR), and at the CERN and at the Tevatron Fermilab proton-antiproton colliders; finally the cosmic ray measurements at even higher energies. A short discussion on Conclusions and Perspectives follows.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 10:53:24 GMT" } ]
2007-12-07T00:00:00
[ [ "Giacomelli", "Giorgio", "", "Dipartimento di Fisica dell'Universita' di Bologna\n and INFN Sezione di Bologna" ] ]
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712.0907
Michiel van Setten
M.J. van Setten, G.A. de Wijs, G. Brocks
A first-principles study of the electronic structure and stability of Be(BH4)2
7 pages, 7 figures
Phys. Rev. B 77, 165115 (2008)
null
null
cond-mat.mtrl-sci
null
Alanates and boranates are studied intensively because of their potential use as hydrogen storage materials. In this paper we present a first-principles study of the electronic structure and the energetics of beryllium boranate, Be(BH4)2. From total energy calculations we show that - in contrast to the other boranates and alanates - hydrogen desorption directly to the elements is likely, and is at least competitive with desorption to the elemental hydride (BeH2). The formation enthalpy of Be(BH4)2 is only -0.12 eV/H2 (at T=0K). This low value can be rationalized by the participation of all atoms in the covalent bonding, in contrast to the ionic bonding observed in other boranates. From calculations of thermodynamic properties at finite temperature we estimate a decomposition temperature of 162 K at a pressure of 1 bar.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:10:00 GMT" } ]
2008-04-11T00:00:00
[ [ "van Setten", "M. J.", "" ], [ "de Wijs", "G. A.", "" ], [ "Brocks", "G.", "" ] ]
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712.0908
Alexey Veryaskin
Alexey Veryaskin
Theory of Operation of Direct String Magnetic Gradiometer with Proportional and Integral Feedback
20 pages, 4 figures, submitted to Sensors and Actuators A:Physical content has been modified in accordance with referees comments
null
null
null
physics.ins-det physics.geo-ph
null
A quantitative theory of operation of a novel device, namely Direct String Magnetic Gradiometer (DSMG), is presented. The paper provides a detailed analysis of DSMG basic functions and measured quantities, represented in terms of physical parameters that are known either a priori or can be experimentally determined. It leaves a reasonable degree of freedom to further investigate some of the finer detail of this new instrument based on experimental results coming both from the laboratory environment and from field trials. The analysis also allows us to quantitatively evaluate the error budget for an optimised DSMG.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:00:40 GMT" }, { "version": "v2", "created": "Thu, 13 Dec 2007 05:31:51 GMT" }, { "version": "v3", "created": "Sun, 16 Dec 2007 10:57:45 GMT" }, { "version": "v4", "created": "Sun, 4 May 2008 06:22:05 GMT" } ]
2008-05-04T00:00:00
[ [ "Veryaskin", "Alexey", "" ] ]
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712.0909
Walter Winter
Andrea Donini, Patrick Huber, Silvia Pascoli, Walter Winter, Osamu Yasuda
Physics and Performance Evaluation Group
3 pages, 1 figure. Plenary talk given at the NuFact 07 conference
AIPConf.Proc.981:43-45,2008
10.1063/1.2898998
IPPP/07/95, DCPT/07/190, IDS-NF-Conf-07-02
hep-ph hep-ex
null
We summarize the objectives and results of the ``international scoping study of a future neutrino factory and superbeam facility'' (ISS) physics working group. Furthermore, we discuss how the ISS study should develop into a neutrino factory design study (IDS-NF) from the point of view of physics and performance evaluation.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:00:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Donini", "Andrea", "" ], [ "Huber", "Patrick", "" ], [ "Pascoli", "Silvia", "" ], [ "Winter", "Walter", "" ], [ "Yasuda", "Osamu", "" ] ]
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712.091
Tomasz Kapela
Tomasz Kapela, Piotr Zgliczy\'nski
A Lohner-type algorithm for control systems and ordinary differential inclusions
null
null
null
null
math.DS math.OC
null
We describe a Lohner-type algorithm for the computation of rigorous upper bounds for reachable set for control systems, solutions of ordinary differential inclusions and perturbations of ODEs.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:12:50 GMT" } ]
2007-12-07T00:00:00
[ [ "Kapela", "Tomasz", "" ], [ "Zgliczyński", "Piotr", "" ] ]
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712.0911
Christian Holler
C. M. Holler, R. E. Hills, M. E. Jones, K. Grainge and T. Kaneko
Implementation of an Optimised Cassegrain System for Radio Telescopes
4 pages, 7 figures, to be published in MNRAS
Monthly Notices of the Royal Astronomical Society, 384: 1207-1210 (2008)
10.1111/j.1365-2966.2007.12792.x
null
astro-ph
null
We present the antenna design for a radio interferometer, the Arcminute Microkelvin Imager, together with its beam pattern measurement. Our aim was to develop a low-cost system with high aperture efficiency and low ground-spill across the frequency range 12-18GHz. We use a modified cassegrain system consisting of a commercially-available paraboloidal primary mirror with a diameter of 3.7m, and a shaped secondary mirror. The secondary mirror is oversized with respect to a ray-optics design and has a surface that is bent towards the primary near its outer edge using a square term for the shaping. The antennas are simple to manufacture and therefore their cost is low. The design increased the antenna gain by approximately 10 per cent compared to a normal Cassegrain system while still maintaining low contamination from ground-spill and using a simple design for the horn.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:06:11 GMT" } ]
2011-12-12T00:00:00
[ [ "Holler", "C. M.", "" ], [ "Hills", "R. E.", "" ], [ "Jones", "M. E.", "" ], [ "Grainge", "K.", "" ], [ "Kaneko", "T.", "" ] ]
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712.0912
Gao-Feng Gu
Gao-Feng Gu (ECUST), Wei Chen (SZSE), Wei-Xing Zhou (ECUST)
Empirical regularities of order placement in the Chinese stock market
15 Elsart page including 1 table and 5 figures
Physica A 387 (13), 3173-3182 (2008)
10.1016/j.physa.2008.01.114
null
q-fin.TR physics.soc-ph
null
Using ultra-high-frequency data extracted from the order flows of 23 stocks traded on the Shenzhen Stock Exchange, we study the empirical regularities of order placement in the opening call auction, cool period and continuous auction. The distributions of relative logarithmic prices against reference prices in the three time periods are qualitatively the same with quantitative discrepancies. The order placement behavior is asymmetric between buyers and sellers and between the inside-the-book orders and outside-the-book orders. In addition, the conditional distributions of relative prices in the continuous auction are independent of the bid-ask spread and volatility. These findings are crucial to build an empirical behavioral microscopic model based on order flows for Chinese stocks.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:08:48 GMT" } ]
2008-12-02T00:00:00
[ [ "Gu", "Gao-Feng", "", "ECUST" ], [ "Chen", "Wei", "", "SZSE" ], [ "Zhou", "Wei-Xing", "", "ECUST" ] ]
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712.0913
C\'eline Combet
C. Combet and J. Ferreira
The radial structure of protostellar accretion disks: influence of jets
11 pages, 4 figures. Accepted for publication in A&A
Astron.Astrophys.479:481-491,2008
10.1051/0004-6361:20078734
null
astro-ph
null
The radial structure of accretion disks is a fundamental issue regarding star and planet formation. Many theoretical studies, focussing on different aspects such as e.g. disk emissivity or ionization, have been conducted in the context of the Standard Accretion Disk (SAD) model, where no jet is present. We wish to calculate the structure of YSO accretion disks in an approach that takes into account the presence of the protostellar jets. The radial structure of these Jet Emitting Disks (JED) should then be compared to that of standard accretion disks. The analytical treatment used in this work is very similar to that of standard accretion disks but is using the parameter space of Magnetised Accretion-Ejection Structures that include the jet torque on the underlying disk. In this framework, the analytical expressions of key quantities, such as mid-plane temperatures, surface densities or disk aspect ratio are derived. It is found that JEDs present a structure very different from the SADs and that can be observationally tested. The implications on planet formation in the inner regions of accretion disks are briefly discussed. We also supply sets of analytical formulae, valid in different opacity regimes, for the disk quantities. These expressions can be readily used for any work where the disk structure is needed as an input for the model.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:09:56 GMT" } ]
2014-11-18T00:00:00
[ [ "Combet", "C.", "" ], [ "Ferreira", "J.", "" ] ]
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712.0914
Vadim Kostrykin
Vadim Kostrykin, Jurgen Potthoff, Robert Schrader
Contraction semigroups on metric graphs
null
null
null
null
math.FA math-ph math.MP
null
The main objective of the present work is to study contraction semigroups generated by Laplace operators on metric graphs, which are not necessarily self-adjoint. We prove criteria for such semigroups to be continuity and positivity preserving. Also we provide a characterization of generators of Feller semigroups on metric graphs.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:17:26 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 22:30:57 GMT" } ]
2008-02-27T00:00:00
[ [ "Kostrykin", "Vadim", "" ], [ "Potthoff", "Jurgen", "" ], [ "Schrader", "Robert", "" ] ]
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712.0915
Igor Hoveijn
I. Hoveijn
Differentiability of the volume of a region enclosed by level sets
11 pages, 1 figure
null
10.1016/j.jmaa.2008.07.012
null
math.CA
null
The level of a function f on an n-dimensional space encloses a region. The volume of a region between two such levels depends on both levels. Fixing one of them the volume becomes a function of the remaining level. We show that if the function f is smooth, the volume function is again smooth for regular values of f. For critical values of f the volume function is only finitely differentiable. The initial motivation for this study comes from Radiotherapy, where such volume functions are used in an optimization process. Thus their differentiability properties become important.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:21:21 GMT" } ]
2015-05-13T00:00:00
[ [ "Hoveijn", "I.", "" ] ]
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712.0916
Matthias Christandl
Matthias Christandl, Ben Toner
Finite de Finetti theorem for conditional probability distributions describing physical theories
Published version. 10 pages, 1 figure
J. Math. Phys. 50, 042104 (2009)
10.1063/1.3114986
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We work in a general framework where the state of a physical system is defined by its behaviour under measurement and the global state is constrained by no-signalling conditions. We show that the marginals of symmetric states in such theories can be approximated by convex combinations of independent and identical conditional probability distributions, generalizing the classical finite de Finetti theorem of Diaconis and Freedman. Our results apply to correlations obtained from quantum states even when there is no bound on the local dimension, so that known quantum de Finetti theorems cannot be used.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:22:18 GMT" }, { "version": "v2", "created": "Thu, 16 Apr 2009 05:00:17 GMT" } ]
2009-04-16T00:00:00
[ [ "Christandl", "Matthias", "" ], [ "Toner", "Ben", "" ] ]
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712.0917
Inge Bethke
Inge Bethke and Piet Rodenburg
Some properties of finite meadows
8 pages, 1 table
null
null
null
math.RA cs.SC
null
The aim of this note is to describe the structure of finite meadows. We will show that the class of finite meadows is the closure of the class of finite fields under finite products. As a corollary, we obtain a unique representation of minimal meadows in terms of prime fields.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:27:44 GMT" } ]
2011-11-10T00:00:00
[ [ "Bethke", "Inge", "" ], [ "Rodenburg", "Piet", "" ] ]
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712.0918
Joke Adam
J. Adam, B. Janssen, W. Troost, W. Van Herck
Some thoughts about matrix coordinate transformations
LaTeX, 12 pages
Phys.Lett.B662:220-226,2008
10.1016/j.physletb.2008.03.009
null
hep-th
null
Matrix coordinate transformations are defined as substitution operators without requiring an ordering prescription or an inclusion function from the Abelian coordinate transformations. We construct transforming objects mimicking most of the properties of tensors. We point out some problems with the matrix generalization of contravariant vectors. We suggest to use the substitution operators to search for an inclusion function.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:07:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Adam", "J.", "" ], [ "Janssen", "B.", "" ], [ "Troost", "W.", "" ], [ "Van Herck", "W.", "" ] ]
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712.0919
Pedro Lind
Andres A. Pena, Pedro G. Lind, Hans J. Herrmann
Modeling slow deformation of polygonal particles using DEM
15 pages, 10 figures
Particuology 6, 506-514 (2008)
null
null
cond-mat.mtrl-sci
null
We introduce two improvements in the numerical scheme to simulate collision and slow shearing of irregular particles. First, we propose an alternative approach based on simple relations to compute the frictional contact forces. The approach improves efficiency and accuracy of the Discrete Element Method (DEM) when modeling the dynamics of the granular packing. We determine the proper upper limit for the integration step in the standard numerical scheme using a wide range of material parameters. To this end, we study the kinetic energy decay in a stress controlled test between two particles. Second, we show that the usual way of defining the contact plane between two polygonal particles is, in general, not unique which leads to discontinuities in the direction of the contact plane while particles move. To solve this drawback, we introduce an accurate definition for the contact plane based on the shape of the overlap area between touching particles, which evolves continuously in time.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 11:42:48 GMT" } ]
2011-03-15T00:00:00
[ [ "Pena", "Andres A.", "" ], [ "Lind", "Pedro G.", "" ], [ "Herrmann", "Hans J.", "" ] ]
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712.092
Ebrahim Ghorbani
Saieed Akbari and Ebrahim Ghorbani
Choice Number and Energy of Graphs
to appear in Linear Algebra and its Applications
null
null
null
math.CO
null
The energy of a graph G, denoted by E(G), is defined as the sum of the absolute values of all eigenvalues of G. It is proved that E(G)>= 2(n-\chi(\bar{G}))>= 2(ch(G)-1) for every graph G of order n, and that E(G)>= 2ch(G) for all graphs G except for those in a few specified families, where \bar{G}, \chi(G), and ch(G) are the complement, the chromatic number, and the choice number of G, respectively.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:00:20 GMT" } ]
2007-12-07T00:00:00
[ [ "Akbari", "Saieed", "" ], [ "Ghorbani", "Ebrahim", "" ] ]
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712.0921
Anton Zelinger
Daniel M. Greenberger, Michael A. Horne, Anton Zeilinger
Going Beyond Bell's Theorem
This original suggestion of GHZ-states and of what is today called multi-qubit entanglement is not generally accessible, so here we make it available electronically. Subsequently, such states were first realized with photons by Bouwmeester et al. arXiv:quant-ph/9810035 (PRL 82, 1345-49, 1999) and applied to a quantum nonlocality test by Pan et al. (Nature 403, 515-519, 2000)
in: 'Bell's Theorem, Quantum Theory, and Conceptions of the Universe', M. Kafatos (Ed.), Kluwer, Dordrecht, 69-72 (1989)
null
null
quant-ph
null
Bell's Theorem proved that one cannot in general reproduce the results of quantum theory with a classical, deterministic local model. However, Einstein originally considered the case where one could define an 'element of reality', namely for the much simpler case where one could predict with certainty a definite outcome for an experiment. For this simple case, Bell's Theorem says nothing. But by using a slightly more complicated model than Bell, one can show that even in this simple case where one can make definite predictions, one still cannot generally introduce deterministic, local models to explain the results.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:04:25 GMT" } ]
2008-05-01T00:00:00
[ [ "Greenberger", "Daniel M.", "" ], [ "Horne", "Michael A.", "" ], [ "Zeilinger", "Anton", "" ] ]
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712.0922
Rudolf Rohr
Rudolf Philippe Rohr
Transgression and Clifford algebras
19 pages
Annales de l'institut Fourier, (2008) 59 :1337-1358
null
null
math.RT math.QA
null
Let $W$ be a differential (not necessarily commutative) algebra which carries a free action of a polynomial algebra $SP$ with homogeneous generators $p_1, >..., p_r$. We show that for $W$ acyclic, the cohomology of the quotient $H(W/<p_1, ..., p_r>)$ is isomorphic to a Clifford algebra $\text{Cl}(P,B)$, where the (possibly degenerate) bilinear form $B$ depends on $W$. This observation is an analogue of an old result of Borel in a non-commutative context. As an application, we study the case of $W$ given by the quantized Weil algebra $\qWg = \Ug \otimes \Clg$ for $\Lieg$ a reductive Lie algebra. The resulting cohomology of the canonical Weil differential gives a Clifford algebra, but the bilinear form vanishes on the space of primitive invariants of the semi-simple part. As an application, we consider the deformed Weil differential (following Freed, Hopkins and Teleman).
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:12:41 GMT" } ]
2011-05-17T00:00:00
[ [ "Rohr", "Rudolf Philippe", "" ] ]
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712.0923
Poul Olesen
Poul Olesen
A Linear Equation for Wilson Loops
6 pages. Some comments added
Phys.Lett.B660:597-599,2008
10.1016/j.physletb.2008.01.036
null
hep-th hep-lat hep-ph
null
The Makeenko-Migdal loop equation is non-linear and first order in the area derivative, but we show that for simple loops in QCD$_2$ it is possible to reformulate this equation as a linear equation with second order derivatives. This equation is a bound state Schr\"odinger equation with a three dimensional Coulomb potential. Thus, loop dynamics leads to a surprising new picture of confinement, where this phenomenon is due to a (bound state) localization in loop space, with the Wilson loops decaying exponentially outside a characteristic radius.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:25:58 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 12:43:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Olesen", "Poul", "" ] ]
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712.0924
Nick van Eijndhoven
Nick van Eijndhoven
GRB neutrino detection via time profile stacking
4 pages, 5 figures. Talk presented at ICRC07, Merida, Mexico
null
null
null
astro-ph
null
A method is presented for the identification of high-energy neutrinos from gamma ray bursts by means of a large-scale neutrino telescope. The procedure makes use of a time profile stacking technique of observed neutrino induced signals in correlation with satellite observations. By selecting a rather wide time window, a possible difference between the arrival times of the gamma and neutrino signals may also be identified. This might provide insight in the particle production processes at the source. By means of a toy model it will be demonstrated that a statistically significant signal can be obtained with a km$^{3}$-scale neutrino telescope on a sample of 500 gamma ray bursts for a signal rate as low as 1 detectable neutrino for 3% of the bursts.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:33:35 GMT" } ]
2007-12-07T00:00:00
[ [ "van Eijndhoven", "Nick", "" ] ]
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712.0925
Marcella Palese
M. Palese and E. Winterroth
Lagrangian reductive structures on gauge-natural bundles
11 pages, remarks and comments added, this version published in ROMP
Rep. Math. Phys. 62(2) (2008) 229--239.
10.1016/S0034-4877(08)80028-6
null
math-ph math.DG math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A reductive structure is associated here with Lagrangian canonically defined conserved quantities on gauge-natural bundles. Parametrized transformations defined by the gauge-natural lift of infinitesimal principal automorphisms induce a variational sequence such that the generalized Jacobi morphism is naturally self-adjoint. As a consequence, its kernel defines a reductive split structure on the relevant underlying principal bundle.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:37:32 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 11:33:11 GMT" }, { "version": "v3", "created": "Wed, 15 Oct 2008 09:07:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Palese", "M.", "" ], [ "Winterroth", "E.", "" ] ]
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712.0926
Claude Berthier
F. Levy (LCMI), I. Sheikin (LCMI), C. Berthier (LCMI), M. Horvatic (LCMI), M. Takigawa (ISSP), H. Kageyama, T. Waki (ISSP), Y. Ueda (ISSP)
Field dependence of the quantum ground state in the Shastry-Sutherland system SrCu$_2$(BO$_3$)$_2$
submitted to European Physical Letters
Europhysics Letters (EPL) 81 (2008) 67004
10.1209/0295-5075/81/67004
null
cond-mat.str-el
null
We present magnetic torque measurements on the Shastry-Sutherland quantum spin system SrCu$_2$(BO$_3$)$_2$ in fields up to 31 T and temperatures down to 50 mK. A new quantum phase is observed in a 1 T field range above the 1/8 plateau, in agreement with recent NMR results. Since the presence of the DM coupling precludes the existence of a true Bose-Einstein condensation and the formation of a supersolid phase in SrCu$_2$(BO$_3$)$_2$, the exact nature of the new phase in the vicinity of the plateau remains to be explained. Comparison between magnetization and torque data reveals a huge contribution of the Dzyaloshinskii-Moriya interaction to the torque response. Finally, our measurements demonstrate the existence of a supercooling due to adiabatic magnetocaloric effects in pulsed field experiments.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:44:28 GMT" } ]
2008-04-01T00:00:00
[ [ "Levy", "F.", "", "LCMI" ], [ "Sheikin", "I.", "", "LCMI" ], [ "Berthier", "C.", "", "LCMI" ], [ "Horvatic", "M.", "", "LCMI" ], [ "Takigawa", "M.", "", "ISSP" ], [ "Kageyama", "H.", "", "ISSP" ], [ "Waki", "T.", "", "ISSP" ], [ "Ueda", "Y.", "", "ISSP" ] ]
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712.0927
Fengshan Liu
F. S. Liu, X. Y. Xia, Shude Mao, Hong Wu, Z. G. Deng
Photometric Properties and Scaling Relations of Early Type Brightest Cluster Galaxies
15 pages, 15 figures, and 2 tables; in press in MNRAS. Accepted 2007 November 23, Received 2007 November 23; in original form of 2007 August 6
null
10.1111/j.1365-2966.2007.12818.x
null
astro-ph
null
We investigate the photometric properties of the early type Brightest Cluster Galaxies (BCGs) using a carefully selected sample of 85 BCGs from the C4 cluster catalogue with redshift less than 0.1. We perform accurate background subtractions, and surface photometry for these BCGs to 25 $\magsec$ in the Sloan $r$-band. By quantitatively analysing the gradient of the Petrosian profiles of BCGs, we find that a large fraction of BCGs have extended stellar envelopes in their outskirts; more luminous BCGs tend to have more extended stellar halos that are likely connected with mergers. A comparison sample of elliptical galaxies was chosen with similar apparent magnitude and redshift ranges, for which the same photometric analysis procedure is applied. We find that BCGs have steeper size-luminosity ($R \propto L^\alpha$) and Faber-Jackson ($L \propto \sigma^\beta$) relations than the bulk of early type galaxies. Furthermore, the power-law indices ($\alpha$ and $\beta$) in these relations increase as the isophotal limits become deeper. For isophotal limits from 22 to 25 $\magsec$, BCGs are usually larger than the bulk of early type galaxies, and a large fraction ($\sim 49%$) of BCGs have disky isophotal shapes. The differences in the scaling relations are consistent with a scenario where the dynamical structure and formation route of BCGs may be different from the bulk of early type galaxies, in particular dry (dissipationless) mergers may play a more important role in their formation; we highlight several possible dry merger candidates in our sample.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:52:06 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 14:51:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "F. S.", "" ], [ "Xia", "X. Y.", "" ], [ "Mao", "Shude", "" ], [ "Wu", "Hong", "" ], [ "Deng", "Z. G.", "" ] ]
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712.0928
Jonathan Pridham
J. P. Pridham
Galois actions on homotopy groups
72 pages; v2 corrections to Section 3; v3 references updated; v4 final version
Geom. Topol. 15 (2011) 501-607
10.2140/gt.2011.15.501
null
math.AG math.AT math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the Galois actions on the l-adic schematic and Artin-Mazur homotopy groups of algebraic varieties. For proper varieties of good reduction over a local field K, we show that the l-adic schematic homotopy groups are mixed representations explicitly determined by the Galois action on cohomology of Weil sheaves, whenever l is not equal to the residue characteristic p of K. For quasi-projective varieties of good reduction, there is a similar characterisation involving the Gysin spectral sequence. When l=p, a slightly weaker result is proved by comparing the crystalline and p-adic schematic homotopy types. Under favourable conditions, a comparison theorem transfers all these descriptions to the Artin-Mazur homotopy groups.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:55:24 GMT" }, { "version": "v2", "created": "Wed, 4 Feb 2009 19:01:35 GMT" }, { "version": "v3", "created": "Mon, 24 Aug 2009 21:53:15 GMT" }, { "version": "v4", "created": "Tue, 10 May 2011 14:29:16 GMT" } ]
2014-11-11T00:00:00
[ [ "Pridham", "J. P.", "" ] ]
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712.0929
Martin W. Gruenewald
The LEP Collaborations: ALEPH Collaboration, DELPHI Collaboration, L3 Collaboration, OPAL Collaboration, the LEP Electroweak Working Group
Precision Electroweak Measurements and Constraints on the Standard Model
18 pages, 6 figures
null
null
CERN-PH-EP/2007-039
hep-ex
null
This note presents constraints on Standard Model parameters using published and preliminary precision electroweak results measured at the electron-positron colliders LEP and SLC. The results are compared with precise electroweak measurements from other experiments, notably CDF and D{\O}at the Tevatron. Constraints on the input parameters of the Standard Model are derived from the results obtained in high-$Q^2$ interactions, and used to predict results in low-$Q^2$ experiments, such as atomic parity violation, M{\o}ller scattering, and neutrino-nucleon scattering.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:09:51 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 09:53:08 GMT" } ]
2012-08-27T00:00:00
[ [ "The LEP Collaboration", "", "" ], [ "ALEPH Collaboration", "", "" ], [ "DELPHI Collaboration", "", "" ], [ "L3 Collaboration", "", "" ], [ "OPAL Collaboration", "", "" ], [ "the LEP Electroweak Working Group", "", "" ] ]
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712.093
Ireneusz Weymann
I. Weymann and J. Barnas
Shot noise and tunnel magnetoresistance in multilevel quantum dots: Effects of cotunneling
null
Phys. Rev. B 77, 075305 (2008)
10.1103/PhysRevB.77.075305
null
cond-mat.mes-hall
null
Spin-dependent transport through a multilevel quantum dot weakly coupled to ferromagnetic leads is analyzed theoretically by means of the real-time diagrammatic technique. Both the sequential and cotunneling processes are taken into account, which makes the results on tunnel magnetoresistance (TMR) and shot noise applicable in the whole range of relevant bias and gate voltages. Suppression of the TMR due to inelastic cotunneling and super-Poissonian shot noise have been found in some of the Coulomb blockade regions. Furthermore, in the Coulomb blockade regime there is an additional contribution to the noise due to bunching of cotunneling processes involving the spin-majority electrons. On the other hand, in the sequential tunneling regime TMR oscillates with the bias voltage, while the current noise is generally sub-Poissonian.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:13:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Weymann", "I.", "" ], [ "Barnas", "J.", "" ] ]
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712.0931
Stefan Bahr
S. Bahr, K. Petukhov, V. Mosser, W. Wernsdorfer
Energy Level Lifetimes in the Single-Molecule Magnet Fe_8 : Experiments and Simulations
6 pages, 5 figures
Phys. Rev. B 77, 064404 (2008)
10.1103/PhysRevB.77.064404
null
cond-mat.mes-hall
null
We present pump-probe measurements on the single-molecule magnet Fe_8 with microwave pulses having a length of several nanoseconds. The microwave radiation in the experiments is located in the frequency range between 104 GHz and 118 GHz. The dynamics of the magnetization of the single Fe_8 crystal is measured using micrometer-sized Hall sensors. This technique allows us to determine the level lifetimes of excited spin states, that are found to be in good agreement with theoretical calculations. The theory, to which we compare our experimental results, is based on a general spin-phonon coupling formalism, which involves spin transitions between nearest and next-nearest energy levels. We show that good agreement between theory and experiments is only obtained when using both the Delta m_S = +-1 transition as well as Delta m_S = +-2, where Delta m_S designates a change in the spin quantum number m_S. Temperature dependent studies of the level lifetimes of several spin states allow us finally to determine experimentally the spin-phonon coupling constants.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:42:53 GMT" } ]
2008-02-05T00:00:00
[ [ "Bahr", "S.", "" ], [ "Petukhov", "K.", "" ], [ "Mosser", "V.", "" ], [ "Wernsdorfer", "W.", "" ] ]
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712.0932
Kumar Eswaran Dr.
Dasika Ratna Deepthi, Sujeet Kuchibhotla and K.Eswaran
Dimensionality Reduction and Reconstruction using Mirroring Neural Networks and Object Recognition based on Reduced Dimension Characteristic Vector
Presented in IEEE International Conference on Advances in Computer Vision and Information Technology (ACVIT-07), Nov. 28-30 2007
IEEE International Conference On Advances in Computer Vision and Information Tech. (IEEE, ACVIT-07), pp. 348 - 353 (2007)
null
null
cs.CV cs.AI cs.NE
null
In this paper, we present a Mirroring Neural Network architecture to perform non-linear dimensionality reduction and Object Recognition using a reduced lowdimensional characteristic vector. In addition to dimensionality reduction, the network also reconstructs (mirrors) the original high-dimensional input vector from the reduced low-dimensional data. The Mirroring Neural Network architecture has more number of processing elements (adalines) in the outer layers and the least number of elements in the central layer to form a converging-diverging shape in its configuration. Since this network is able to reconstruct the original image from the output of the innermost layer (which contains all the information about the input pattern), these outputs can be used as object signature to classify patterns. The network is trained to minimize the discrepancy between actual output and the input by back propagating the mean squared error from the output layer to the input layer. After successfully training the network, it can reduce the dimension of input vectors and mirror the patterns fed to it. The Mirroring Neural Network architecture gave very good results on various test patterns.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:11:07 GMT" } ]
2008-12-13T00:00:00
[ [ "Deepthi", "Dasika Ratna", "" ], [ "Kuchibhotla", "Sujeet", "" ], [ "Eswaran", "K.", "" ] ]
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712.0933
Guoce Xin
Guoce Xin
Proof of the Somos-4 Hankel Determinants Conjecture
3 pages
null
null
null
math.CO
null
By considering the fundamental equation $x=y-y^2=z-z^3$, Somos conjectured that the Hankel determinants for the generating series $y(z)$ are the Somos-4 numbers. We prove this conjecture by using the quadratic transformation for Hankel determinants of Sulanke and Xin.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:27:06 GMT" } ]
2007-12-07T00:00:00
[ [ "Xin", "Guoce", "" ] ]
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712.0934
David Baugh
David D. Baugh (Rice University)
The cycle problem: an intriguing periodicity to the zeros of the Riemann zeta function
5 pages, 9 figures
null
null
null
math.GM
null
Summing the values of the real portion of the logarithmic integral of n^rho, where rho is one of a consecutive series of zeros of the Riemann zeta function, reveals an unexpected periodicity to the sum. This is the cycle problem.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:37:49 GMT" } ]
2007-12-07T00:00:00
[ [ "Baugh", "David D.", "", "Rice University" ] ]
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712.0935
Bing Dong
X. Y. Shen, Bing Dong, and X. L. Lei
Phonon-assisted resonant tunneling through a triple-quantum-dot: a phonon-signal detector
3 pages, 3 figures
Chin. Phys. Lett. 25, 683 (2008).
10.1088/0256-307X/25/2/089
null
cond-mat.mes-hall
null
We study the effect of electron-phonon interaction on current and zero-frequency shot noise in resonant tunneling through a series triple-quantum-dot coupling to a local phonon mode by means of a nonperturbative mapping technique along with the Green function formulation. By fixing the energy difference between the first two quantum dots to be equal to phonon frequency and sweeping the level of the third quantum dot, we find a largely enhanced current spectrum due to phonon effect, and in particular we predict current peaks corresponding to phonon-absorption and -emission assisted resonant tunneling processes, which shows that this system can be acted as a sensitive phonon-signal detector or as a cascade phonon generator.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:34:28 GMT" } ]
2009-11-13T00:00:00
[ [ "Shen", "X. Y.", "" ], [ "Dong", "Bing", "" ], [ "Lei", "X. L.", "" ] ]
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712.0936
Lara Benfatto
L.Benfatto, C.Castellani and T.Giamarchi
Doping dependence of the vortex-core energy in bilayer films of cuprates
4pages, 3 figures. References added, final version
Phys. Rev. B 77, 100506(R) (2008)
10.1103/PhysRevB.77.100506
null
cond-mat.supr-con cond-mat.str-el
null
The energy needed to create a vortex core is the basic ingredient to address the physics of thermal vortex fluctuations in underdoped cuprates. Here we theoretically investigate its role on the occurrence of the Beresinskii-Kosterlitz-Thouless transition in a bilayer film with inhomogeneity. From the comparison with recent measurements of the penetration depth in two-unit cell thin films of Y$_{1-x}$Ca$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-\d}$ (YBCO) by Hetel et al. [Nat. Phys. 3, 700 (2007)] we can extract the value of the vortex-core energy $\mu$, and show that $\mu$ scales linearly with $T_c$ at low doping.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:45:44 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 12:27:20 GMT" } ]
2008-04-08T00:00:00
[ [ "Benfatto", "L.", "" ], [ "Castellani", "C.", "" ], [ "Giamarchi", "T.", "" ] ]
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712.0937
Aleksandra Pi\'orkowska
Marek Biesiada and Aleksandra Pi\'orkowska
GRB neutrinos, Lorenz Invariance Violation and the influence of background cosmology
Accepted for publication in JCAP. 10 pages, 3 figures
JCAP 0705:011,2007
10.1088/1475-7516/2007/05/011
null
astro-ph
null
Modern ideas in quantum gravity predict the possibility of Lorenz Invariance Violation (LIV) manifested e.g. by energy dependent modification of standard relativistic dispersion relation. In a recent paper Jacob and Piran proposed that time of flight delays in high energy neutrinos emitted by gamma ray bursts (GRBs) located at cosmological distances can become a valuable tool for setting limits on LIV theories. However, current advances in observational cosmology suggest that our Universe is dominated by dark energy with relatively little guidance on its nature thus leading to several cosmological scenarios compatible with observations. In this paper we raise the issue of how important, in the context of testing LIV theories, is our knowledge of background cosmological model. Specifically we calculate expected time lags for high-energy (100 TeV) neutrinos in different cosmological models. Out of many particular models of dark energy we focus on five: $\Lambda$CDM, quintessence, quintessence with time varying equation of state, brane-world and generalized Chaplygin gas model as representative for various competing approaches. The result is that uncertainty introduced by our ignorance concerning the right phenomenological model describing dark energy dominated universe is considerable and may obscure bounds derived from studying time delays from cosmological sources.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:47:50 GMT" } ]
2009-06-30T00:00:00
[ [ "Biesiada", "Marek", "" ], [ "Piórkowska", "Aleksandra", "" ] ]
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712.0938
Kumar Eswaran Dr.
Dasika Ratna Deepthi, G.R.Aditya Krishna and K. Eswaran
Automatic Pattern Classification by Unsupervised Learning Using Dimensionality Reduction of Data with Mirroring Neural Networks
Presented in IEEE International Conference on Advances in Computer Vision and Information Technology (ACVIT-07), Nov. 28-30 2007
IEEE International Conference on Advances in Computer Vision and Information Tech. (IEEE, ACVIT-07), pp. 354 - 360 (2007)
null
null
cs.LG cs.AI cs.NE
null
This paper proposes an unsupervised learning technique by using Multi-layer Mirroring Neural Network and Forgy's clustering algorithm. Multi-layer Mirroring Neural Network is a neural network that can be trained with generalized data inputs (different categories of image patterns) to perform non-linear dimensionality reduction and the resultant low-dimensional code is used for unsupervised pattern classification using Forgy's algorithm. By adapting the non-linear activation function (modified sigmoidal function) and initializing the weights and bias terms to small random values, mirroring of the input pattern is initiated. In training, the weights and bias terms are changed in such a way that the input presented is reproduced at the output by back propagating the error. The mirroring neural network is capable of reducing the input vector to a great degree (approximately 1/30th the original size) and also able to reconstruct the input pattern at the output layer from this reduced code units. The feature set (output of central hidden layer) extracted from this network is fed to Forgy's algorithm, which classify input data patterns into distinguishable classes. In the implementation of Forgy's algorithm, initial seed points are selected in such a way that they are distant enough to be perfectly grouped into different categories. Thus a new method of unsupervised learning is formulated and demonstrated in this paper. This method gave impressive results when applied to classification of different image patterns.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:52:04 GMT" } ]
2008-12-15T00:00:00
[ [ "Deepthi", "Dasika Ratna", "" ], [ "Krishna", "G. R. Aditya", "" ], [ "Eswaran", "K.", "" ] ]
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712.0939
Vladimir Spokoiny
Denis Belomestny, Vladimir Spokoiny
Spatial aggregation of local likelihood estimates with applications to classification
Published in at http://dx.doi.org/10.1214/009053607000000271 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Statistics 2007, Vol. 35, No. 5, 2287-2311
10.1214/009053607000000271
IMS-AOS-AOS0274
math.ST stat.TH
null
This paper presents a new method for spatially adaptive local (constant) likelihood estimation which applies to a broad class of nonparametric models, including the Gaussian, Poisson and binary response models. The main idea of the method is, given a sequence of local likelihood estimates (``weak'' estimates), to construct a new aggregated estimate whose pointwise risk is of order of the smallest risk among all ``weak'' estimates. We also propose a new approach toward selecting the parameters of the procedure by providing the prescribed behavior of the resulting estimate in the simple parametric situation. We establish a number of important theoretical results concerning the optimality of the aggregated estimate. In particular, our ``oracle'' result claims that its risk is, up to some logarithmic multiplier, equal to the smallest risk for the given family of estimates. The performance of the procedure is illustrated by application to the classification problem. A numerical study demonstrates its reasonable performance in simulated and real-life examples.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:53:29 GMT" } ]
2007-12-18T00:00:00
[ [ "Belomestny", "Denis", "" ], [ "Spokoiny", "Vladimir", "" ] ]
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712.094
Bruno. Cessac
E. Pecou, B. Cessac, G. Espinoza
Inducing periodicity and chaos by negative feedback
This paper has been withdrawn due to an error in the proof of the main theorem
null
null
null
nlin.CD math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn due to an error in the proof of the main theorem.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:05:27 GMT" }, { "version": "v2", "created": "Wed, 15 Apr 2009 07:47:04 GMT" }, { "version": "v3", "created": "Sat, 6 Nov 2010 17:59:56 GMT" } ]
2010-11-09T00:00:00
[ [ "Pecou", "E.", "" ], [ "Cessac", "B.", "" ], [ "Espinoza", "G.", "" ] ]
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712.0941
Aleksandra Pi\'orkowska
Marek Biesiada and Aleksandra Pi\'orkowska
Gravitational lensing time delays as a tool for testing Lorentz Invariance Violation
11 pages, submitted to A&A. Version corrected in order to acknowledge the priority of G. Amelino-Camelia et al. (1998 Nature 393, 763) in formulating the idea of using gravitational time delays for testing LIV
Mon.Not.Roy.Astron.Soc.396: 946-950, 2009
10.1111/j.1365-2966.2009.14748.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite the fact that quantum gravity theory still remains elusive, it is generally expected that it will bring the picture of a space-time foam at short distances leading to Lorenz Invariance Violation (LIV) manifested e.g. by energy dependent modification of standard relativistic dispersion relation. One direction of research, pursued intensively is to measure energy dependent time of arrival delays in photons emitted by astrophysical sources located at cosmological distances. This is tempered however by our ignorance of either intrinsic delay (at source frame) in different energy channels or as recently shown, the correct model of the background cosmology. In this paper we propose a new test based on gravitational lensing. Monitoring time delays between images performed in different energy channels (e.g. optical - low energy and TeV photons) may reveal extra delays due to distorted dispersion relation typical in LIV theories - a test which is free from the systematics inherent in other settings.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:09:38 GMT" }, { "version": "v2", "created": "Thu, 11 Sep 2008 09:52:16 GMT" } ]
2015-05-13T00:00:00
[ [ "Biesiada", "Marek", "" ], [ "Piórkowska", "Aleksandra", "" ] ]
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712.0942
Martin Greiter
Ronny Thomale, Martin Greiter
Numerical analysis of three-band models for CuO planes as candidates for a spontaneous T violating orbital current phase
12 pages, 15 figures
Phys. Rev. B 77, 094511 (2008)
10.1103/PhysRevB.77.094511
null
cond-mat.supr-con cond-mat.str-el
null
Recently, we have numerically evaluated the current-current correlation function for the ground states of three-band models for the CuO planes of high-Tc superconductors at hole doping x=1/8 using systems with 24 sites and periodic boundary conditions. In this article, the numerical analysis is explicated in detail and extended to a wider range of parameters. Our results show no evidence for the time-reversal symmetry violating current patterns recently proposed by Varma. If such current patterns exist, our results indicate that the energy associated with the loop currents must be smaller than 5 meV per link even if the on-site chemical potential on the oxygen sites, which is generally assumed to be of the order of 3.6 eV, is taken to zero, as advocated by Varma. We also vary the inter-atomic Coulomb repulsion scale and find only a weak dependence on this parameter. So while our studies do not rule out the existence of such current patterns, they do rule out that quantum critical fluctuations of these patterns are responsible for phenomena occurring at significantly higher energies such as the superconductivity or the anomalous properties observed in the strange metal phase provided the CuO superconductors are adequately described by any of the three-band models discussed.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:14:09 GMT" } ]
2008-03-13T00:00:00
[ [ "Thomale", "Ronny", "" ], [ "Greiter", "Martin", "" ] ]
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712.0943
Mario A. Serna
Graham G. Ross and Mario Serna
Mass Determination of New States at Hadron Colliders
Minor corrections. 10 pages, 6 figures. Clarrified behavior under ISR
Phys.Lett.B665:212-218,2008
10.1016/j.physletb.2008.06.003
OUTP-0719P
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an improved method for hadron-collider mass determination of new states that decay to a massive, long-lived state like the LSP in the MSSM. We focus on pair produced new states which undergo three-body decay to a pair of visible particles and the new invisible long-lived state. Our approach is to construct a kinematic quantity which enforces all known physical constraints on the system. The distribution of this quantity calculated for the observed events has an endpoint that determines the mass of the new states. However we find it much more efficient to determine the masses by fitting to the entire distribution and not just the end point. We consider the application of the method at the LHC for various models and demonstrate that the method can determine the masses within about 6 GeV using only 250 events. This implies the method is viable even for relatively rare processes at the LHC such as neutralino pair production.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:18:00 GMT" }, { "version": "v2", "created": "Wed, 11 Jun 2008 17:06:48 GMT" }, { "version": "v3", "created": "Mon, 30 Jun 2008 11:45:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Ross", "Graham G.", "" ], [ "Serna", "Mario", "" ] ]
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712.0944
Stephen Doty
Stephen Doty and Jun Hu
Schur-Weyl duality for orthogonal groups
35 pages; to appear in Proc. L.M.S
null
10.1112/plms/pdn044
null
math.RT math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove Schur--Weyl duality between the Brauer algebra $\mathfrak{B}_n(m)$ and the orthogonal group $O_{m}(K)$ over an arbitrary infinite field $K$ of odd characteristic. If $m$ is even, we show that each connected component of the orthogonal monoid is a normal variety; this implies that the orthogonal Schur algebra associated to the identity component is a generalized Schur algebra. As an application of the main result, an explicit and characteristic-free description of the annihilator of $n$-tensor space $V^{\otimes n}$ in the Brauer algebra $mathfrak{B}_n(m)$ is also given.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:21:38 GMT" }, { "version": "v2", "created": "Tue, 7 Oct 2008 15:30:22 GMT" }, { "version": "v3", "created": "Wed, 8 Oct 2008 05:09:04 GMT" } ]
2014-02-26T00:00:00
[ [ "Doty", "Stephen", "" ], [ "Hu", "Jun", "" ] ]
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712.0945
Bo\v{s}tjan Golob
B. Golob
Recent results on D^0 mixing from Belle
11 pages, 13 figures, to appear in proceedings of XXIII International Symposium on Lepton and Photon Interactions at High Energy, Daegu, S. Korea
null
null
null
hep-ex
null
We report on recent measurements of the $D^0-\bar{D}^0$ mixing and $CP$ violation parameters performed by the Belle experiment. The evidence for the mixing phenomena in the system of neutral $D$ mesons, arising in the study of $D^0\to K^+K^-, \pi^+\pi^-$ decays is presented first. Using a time dependent Dalitz analysis of $D^0\to K_S\pi^+\pi^-$ decays we also obtained the most precise up-to-date determination of the mass difference of the two $D$ meson mass eigenstates. The presented results are based on 540 fb$^{-1}$ of data recorded by the Belle detector at the KEKB $e^+e^-$ collider. We conclude with short prospects for the future measurements.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:22:57 GMT" } ]
2007-12-07T00:00:00
[ [ "Golob", "B.", "" ] ]
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712.0946
Alexei Morozov
A. Morozov
Hamiltonian Formalism in the Presence of Higher Derivatives
8 pages
Theor.Math.Phys.157:1542-1549,2008
10.1007/s11232-008-0128-2
ITEP/TH-72/07
hep-th
null
A short review of basic formulas from Hamiltonian formalism in classical mechanics in the case when Lagrangian contains N time-derivatives of n coordinate variables. For non-local models N=infinity.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:23:31 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 15:40:47 GMT" }, { "version": "v3", "created": "Thu, 13 Dec 2007 08:18:57 GMT" } ]
2008-12-25T00:00:00
[ [ "Morozov", "A.", "" ] ]
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712.0947
Miko{\l}aj Chojnacki
Mikolaj Chojnacki, Wojciech Florkowski, Wojciech Broniowski and Adam Kisiel
Soft heavy-ion physics from hydrodynamics with statistical hadronization - predictions for the Large Hadron Collider
14 pages, 18 figures
Phys.Rev.C78:014905,2008
10.1103/PhysRevC.78.014905
null
nucl-th hep-ph nucl-ex
null
Hydrodynamics merged with single-freeze-out statistical hadronization is used to describe the midrapidity hadron production in relativistic heavy-ion collisions at the highest RHIC energies and to make predictions for the LHC. Thermodynamic properties of the quark-gluon plasma are taken from lattice simulations, at low temperatures the hadron-gas equation of state is used, while in the cross-over region an interpolation between the two equations of state is constructed. The initial condition for hydrodynamics is obtained from a Glauber profile for the entropy, with the initial central temperature Ti. The conditions obtained from the hydrodynamic expansion at the freeze-out temperature Tf are used as input for the thermal event generator THERMINATOR. Basic physical observables are obtained: the transverse-momentum spectra, the elliptic flow coefficient v2, and the HBT radii. The femtoscopic observables are evaluated with the help of the two-particle method which accounts for the resonance decays and Coulomb final-state interactions. The problem of a simultaneous description of all discussed observables is addressed, with the conclusion that at the highest RHIC energies our approach gives a quite satisfactory global description of soft hadronic observables. Some discrepancies may be attributed to the absence of the final-state elastic interactions among hadrons. Extrapolating Ti to higher values allows for global predictions for soft hadronic physics at the LHC. We test Ti=400, 450, and 500 MeV, and observe the expected growth of particle multiplicities and the increase of the flow, resulting in smaller slopes of the pT-spectra. The elliptic flow of pions exhibits saturation, with v2 remaining practically constant, while the HBT radii increase moderately with Ti.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:25:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Chojnacki", "Mikolaj", "" ], [ "Florkowski", "Wojciech", "" ], [ "Broniowski", "Wojciech", "" ], [ "Kisiel", "Adam", "" ] ]
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712.0948
Stefan Woltran
Stefan Woltran
A Common View on Strong, Uniform, and Other Notions of Equivalence in Answer-Set Programming
null
null
null
null
cs.AI cs.LO
null
Logic programming under the answer-set semantics nowadays deals with numerous different notions of program equivalence. This is due to the fact that equivalence for substitution (known as strong equivalence) and ordinary equivalence are different concepts. The former holds, given programs P and Q, iff P can be faithfully replaced by Q within any context R, while the latter holds iff P and Q provide the same output, that is, they have the same answer sets. Notions in between strong and ordinary equivalence have been introduced as theoretical tools to compare incomplete programs and are defined by either restricting the syntactic structure of the considered context programs R or by bounding the set A of atoms allowed to occur in R (relativized equivalence).For the latter approach, different A yield properly different equivalence notions, in general. For the former approach, however, it turned out that any ``reasonable'' syntactic restriction to R coincides with either ordinary, strong, or uniform equivalence. In this paper, we propose a parameterization for equivalence notions which takes care of both such kinds of restrictions simultaneously by bounding, on the one hand, the atoms which are allowed to occur in the rule heads of the context and, on the other hand, the atoms which are allowed to occur in the rule bodies of the context. We introduce a general semantical characterization which includes known ones as SE-models (for strong equivalence) or UE-models (for uniform equivalence) as special cases. Moreover,we provide complexity bounds for the problem in question and sketch a possible implementation method. To appear in Theory and Practice of Logic Programming (TPLP).
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:26:42 GMT" } ]
2007-12-07T00:00:00
[ [ "Woltran", "Stefan", "" ] ]
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712.0949
Nuo Yang
Nuo Yang, Gang Zhang, Baowen Li
Ultralow Thermal Conductivity of Isotope-Doped Silicon Nanowires
Nano Lett., ASAP Article 10.1021/nl0725998 S1530-6984(07)02599-4 Web Release Date: December 21, 2007
null
10.1021/nl0725998
null
cond-mat.mtrl-sci cond-mat.other
null
The thermal conductivity of silicon nanowires (SiNWs) is investigated by molecular dynamics (MD) simulation. It is found that the thermal conductivity of SiNWs can be reduced exponentially by isotopic defects at room temperature. The thermal conductivity reaches the minimum, which is about 27% of that of pure 28Si NW, when doped with fifty percent isotope atoms. The thermal conductivity of isotopic-superlattice structured SiNWs depends clearly on the period of superlattice. At a critical period of 1.09 nm, the thermal conductivity is only 25% of the value of pure Si NW. An anomalous enhancement of thermal conductivity is observed when the superlattice period is smaller than this critical length. The ultra-low thermal conductivity of superlattice structured SiNWs is explained with phonon spectrum theory.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:32:11 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 05:22:46 GMT" }, { "version": "v3", "created": "Wed, 26 Dec 2007 06:54:50 GMT" } ]
2015-05-13T00:00:00
[ [ "Yang", "Nuo", "" ], [ "Zhang", "Gang", "" ], [ "Li", "Baowen", "" ] ]
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712.095
Andrei G. Bytsko
A.G. Bytsko, I.E. Shenderovich
On string solutions of Bethe equations in N=4 supersymmetric Yang-Mills theory
LaTex, 9 pages, 1 figure
Zap.Nauchn.Semin. POMI 347 (2007) 75-87; J.Math.Sciences 151 (2008) 2840-2847 (Engl. transl.)
10.1007/s10958-008-9004-8
DESY 07-216
nlin.SI hep-th
null
The Bethe equations, arising in description of the spectrum of the dilatation operator for the su(2) sector of the N=4 supersymmetric Yang-Mills theory, are considered in the anti-ferromagnetic regime. These equations are deformation of those for the Heisenberg XXX magnet. It is proven that in the thermodynamic limit roots of the deformed equations group into strings. It is proven that the corresponding Yang's action is convex, which implies uniqueness of solution for centers of the strings. The state formed of strings of length (2n+1) is considered and the density of their distribution is found. It is shown that the energy of such a state decreases as n grows. It is observed that non-analyticity of the left hand side of the Bethe equations leads to an additional contribution to the density and energy of strings of even length. Whence it is concluded that the structure of the anti-ferromagnetic vacuum is determined by the behaviour of exponential corrections to string solutions in the thermodynamic limit and possibly involves strings of length 2.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:43:49 GMT" } ]
2009-11-19T00:00:00
[ [ "Bytsko", "A. G.", "" ], [ "Shenderovich", "I. E.", "" ] ]
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712.0951
Andrej Gendiar
Andrej Gendiar, Martin Mosko, Pavel Vagner and Radoslav Nemeth
Tunneling of interacting fermions in 1D systems
Conference proceedings
Acta Physica Polonica 108 (2005) 661-667
null
null
cond-mat.mes-hall
null
Using the self-consistent Hartree-Fock approximation for spinless electrons at zero temperature, we study tunneling of the interacting electron gas through a single delta-barrier in a finite one-dimensional (1D) wire connected to contacts. Our results exhibit features known from correlated many-body models. In particular, the conductance decays with the wire length as $\propto L^{-2\alpha}$, where the power $\alpha$ is universal. We also show that a similar result for a wire conductance can be extracted from the persistent current (I) through the delta-barrier in a 1D ring, where it is known that I \propto L^{-1-\alpha}$.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 14:57:36 GMT" } ]
2007-12-07T00:00:00
[ [ "Gendiar", "Andrej", "" ], [ "Mosko", "Martin", "" ], [ "Vagner", "Pavel", "" ], [ "Nemeth", "Radoslav", "" ] ]
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712.0952
Andrej Gendiar
Martin Mosko, Pavel Vagner, Andrej Gendiar and Radoslav Nemeth
Coherent transport of interacting electrons through a single scatterer
Conference proceedings
Physica B 378-380 (2006) 908
10.1016/j.physb.2006.01.350
null
cond-mat.mes-hall
null
Using the self-consistent Hartree-Fock method, we calculate the persistent current of weakly-interacting spinless electrons in a one-dimensional ring containing a single delta-barrier. We find that the persistent current decays with the system length (L) asymptotically like $I \propto L^{-1-\alpha}$, where $\alpha > 0$ is the power depending only on the electron-electron interaction. We also simulate tunneling of the weakly-interacting one-dimensional electron gas through a single delta-barrier in a finite wire biased by contacts. We find that the Landauer conductance decays with the system length asymptotically like $L^{-2\alpha}$. The power laws $L^{-1-\alpha}$ and $L^{-2\alpha}$ have so far been observed only in correlated models. Their existence in the Hartree-Fock model is thus surprising.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:03:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Mosko", "Martin", "" ], [ "Vagner", "Pavel", "" ], [ "Gendiar", "Andrej", "" ], [ "Nemeth", "Radoslav", "" ] ]
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712.0953
Konrad Swanepoel
Konrad J. Swanepoel
Cardinalities of k-distance sets in Minkowski spaces
7 pages, 2 figures
Discrete Mathematics 197/198 (1999) 759-767
10.1090/S0002-9939-96-03370-9
null
math.MG math.CO
null
A subset of a metric space is a k-distance set if there are exactly k non-zero distances occuring between points. We conjecture that a k-distance set in a d-dimensional Banach space (or Minkowski space), contains at most (k+1)^d points, with equality iff the unit ball is a parallelotope. We solve this conjecture in the affirmative for all 2-dimensional spaces and for spaces where the unit ball is a parallelotope. For general spaces we find various weaker upper bounds for k-distance sets.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:05:29 GMT" } ]
2007-12-07T00:00:00
[ [ "Swanepoel", "Konrad J.", "" ] ]
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712.0954
Wolfram Schmidt
W. Schmidt
The Numerical Simulation of Turbulence
18 pages, 7 figures; proceedings contribution to "Structure formation in the Universe: Chamonix 2007"
null
null
null
astro-ph
null
In this contribution, I give an overview of the various approaches toward the numerical modelling of turbulence, particularly, in the interstellar medium. The discussion is placed in a physical context, i. e. computational problems are motivated from basic physical considerations. Presenting selected examples for solutions to these problems, I introduce the basic ideas of the most commonly used numerical methods.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 16:15:15 GMT" } ]
2007-12-07T00:00:00
[ [ "Schmidt", "W.", "" ] ]
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712.0955
Andrej Gendiar
Andrej Gendiar, Martin Mosko, Pavel Vagner and Radoslav Nemeth
Tunneling of interacting one-dimensional electrons through a single scatterer: Luttinger liquid behavior in the Hartree-Fock model
Conference proceedings
Physica E 34 (2006) 596
10.1016/j.physe.2006.03.037
null
cond-mat.mes-hall
null
We study tunneling of weakly-interacting spinless electrons at zero temperature through a single delta-barrier in one-dimensional wires and rings of finite lengths. Our numerical calculations are based on the self-consistent Hartree-Fock approximation, nevertheless, our results exhibit features known from correlated many-body models. In particular, the transmission in a wire of length L at the Fermi level is proportional to $L^{-2\alpha}$ with the universal power $\alpha$ (depending on the electron-electron interaction only, not on the strength of the delta-barrier). Similarly, the persistent current in a ring of the circumference $L$ obeys the rule $I\propto L^{-1-\alpha}$ known from the Luttinger liquid and Hubbard models. We show that the transmission at the Fermi level in the wire is related to the persistent current in the ring at the magnetic flux h/4e.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:08:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Gendiar", "Andrej", "" ], [ "Mosko", "Martin", "" ], [ "Vagner", "Pavel", "" ], [ "Nemeth", "Radoslav", "" ] ]
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712.0956
Jing Zhang
Jing Zhang
Affine Algebraic Varieties
Welcome comments
null
null
null
math.AG math.CV
null
In this paper, we give new criteria for affineness of a variety defined over $\Bbb{C}$. Our main result is that an irreducible algebraic variety $Y$ (may be singular) of dimension $d$ ($d\geq 1$) defined over $\Bbb{C}$ is an affine variety if and only if $Y$ contains no complete curves, $H^i(Y, {\mathcal{O}}_Y)=0$ for all $i>0$ and the boundary $X-Y$ is support of a big divisor, where $X$ is a projective variety containing $Y$. We construct three examples to show that a variety is not affine if it only satisfies two conditions among these three conditions. We also give examples to demonstrate the difference between the behavior of the boundary divisor $D$ and the affineness of $Y$. If $Y$ is an affine variety, then the ring $\Gamma (Y, {\mathcal{O}}_Y)$ is noetherian. However, to prove that $Y$ is an affine variety, we do not start from this ring. We explain why we do not need to check the noetherian property of the ring $\Gamma (Y, {\mathcal{O}}_Y)$ directly but use the techniques of sheaf and cohomology.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 18:48:30 GMT" } ]
2007-12-07T00:00:00
[ [ "Zhang", "Jing", "" ] ]
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712.0957
Roman Novikov
Roman Novikov (LMJL)
On stable determination of potential by boundary measurements
null
null
null
null
math.AP math-ph math.MP
null
We give new stability estimates for the Gel'fand-Calderon inverse boundary value problem
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:14:11 GMT" } ]
2007-12-07T00:00:00
[ [ "Novikov", "Roman", "", "LMJL" ] ]
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712.0958
Vlada Limic
V. Limic and P. Tarres
What is the difference between a square and a triangle?
18 pages, 1 figure
null
null
null
math.PR
null
We offer a reader-friendly introduction to the attracting edge problem (also known as the "triangle conjecture") and its most general current solution of Limic and Tarr\`es (2007). Little original research is reported; rather this article ``zooms in'' to describe the essential characteristics of two different techniques/approaches verifying the almost sure existence of the attracting edge for the strongly edge reinforced random walk (SERRW) on a square. Both arguments extend straightforwardly to the SERRW on even cycles. Finally, we show that the case where the underlying graph is a triangle cannot be studied by a simple modification of either of the two techniques.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:14:18 GMT" }, { "version": "v2", "created": "Tue, 20 May 2008 02:32:03 GMT" } ]
2008-05-20T00:00:00
[ [ "Limic", "V.", "" ], [ "Tarres", "P.", "" ] ]
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712.0959
Andrea Ciardi Dr
A. Ciardi, D.J. Ampleford, S.V. Lebedev and C. Stehle
Curved Herbig-Haro Jets: Simulations and Experiments
15 pages, 5 figure, accepted to be published in The Astrophysical Journal
null
10.1086/528679
null
astro-ph
null
Herbig-Haro jets often show some degree of curvature along their path, in many cases produced by the ram pressure of a side-wind. We present simulations of both laboratory and astrophysical curved jets and experimental results from laboratory experiments. We discuss the properties and similarities of the laboratory and astrophysical flow, which show the formation of internal shocks and working surfaces. In particular the results illustrate how the break-up of the bow-shock and clumps in the flow are produced without invoking jet variability; we also discuss how jet rotation reduces the growth of the Rayleigh-Taylor instability in curved jets.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 12:20:59 GMT" }, { "version": "v2", "created": "Fri, 28 Dec 2007 15:28:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Ciardi", "A.", "" ], [ "Ampleford", "D. J.", "" ], [ "Lebedev", "S. V.", "" ], [ "Stehle", "C.", "" ] ]
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712.096
Andrej Gendiar
Roman Krcmar, Andrej Gendiar, Martin Mosko, Radoslav Nemeth, Pavel Vagner and Lubos Mitas
Persistent current of correlated electrons in mesoscopic ring with impurity
Conference proceedings. Accepted for publication in Physica E
Physica E 40 (2008) 1507
10.1016/j.physe.2007.09.074
null
cond-mat.mes-hall
null
The persistent current of correlated electrons in a continuous one-dimensional ring with a single scatterer is calculated by solving the many-body Schrodinger equation for several tens of electrons interacting via the electron-electron (e-e) interaction of finite range. The problem is solved by the configuration-interaction (CI) and diffusion Monte Carlo (DMC) methods. The CI and DMC results are in good agreement. In both cases, the persistent current $I$ as a function of the ring length $L$ exhibits the asymptotic dependence $I \propto L^{-1-\alpha}$ typical of the Luttinger liquid, where the power $\alpha$ depends only on the e-e interaction. The numerical values of $\alpha$ agree with the known formula of the renormalisation-group theory.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:15:44 GMT" } ]
2008-03-31T00:00:00
[ [ "Krcmar", "Roman", "" ], [ "Gendiar", "Andrej", "" ], [ "Mosko", "Martin", "" ], [ "Nemeth", "Radoslav", "" ], [ "Vagner", "Pavel", "" ], [ "Mitas", "Lubos", "" ] ]
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712.0961
Arnaud Pierens
Arnaud Pierens, Richard P. Nelson
On the evolution of multiple low mass planets embedded in a circumbinary disc
12 pages, 16 figures. Accepted for publication in A&A. High resolution pdf available at http://www.maths.qmul.ac.uk/~rpn/preprints/index.html
null
10.1051/0004-6361:20078844
null
astro-ph
null
Previous work has shown that the tidal interaction between a binary system and a circumbinary disc leads to the formation of a large inner cavity in the disc. Subsequent formation and inward migration of a low mass planet causes it to become trapped at the cavity edge, where it orbits until further mass growth or disc dispersal. The question of how systems of multiple planets in circumbinary discs evolve has not yet been addressed. Here, we present a suite of simulations which study the evolution of pairs of planets migrating in the disc. We also present the results of hydrodynamic simulations of five-planet systems, and study their long term evolution after disc dispersal using a N-body code. For the two-planet simulations we assume that the innermost planet has migrated to the edge of the inner cavity and remains trapped there, and study the subsequent evolution of the system as the outermost planet migrates inward. We find that the outcomes largely depend on the mass ratio q=m_i/m_o, where m_i (m_o) is the mass of the innermost (outermost) planet. For q<1, planets usually undergo dynamical scattering or orbital exchange. For values of q>1 the systems reach equilibrium configurations in which the planets are locked into mean motion resonances, and remain trapped at the edge of the inner cavity without further migration. Most simulations of five-planet systems we performed resulted in collisions and scattering events, such that only a single planet remained in orbit about the binary. In one case however, a multiplanet resonant system was found to be dynamically stable over long time scales, suggesting that such systems may be observed in planet searches focussed on close binary systems.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:21:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Pierens", "Arnaud", "" ], [ "Nelson", "Richard P.", "" ] ]
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712.0962
Andrej Gendiar
Antonia Moskova, Martin Mosko and Andrej Gendiar
Possible persistent current in a ring made of the perfect crystalline insulator
Conference proceedings. Accepted for publication in Physica E
Physica E 40 (2008) 1991
10.1016/j.physe.2007.09.042
null
cond-mat.mes-hall
null
A mesoscopic conducting ring pierced by magnetic flux is known to support the persistent electron current. Here we propose possibility of the persistent current in the ring made of the perfect crystalline insulator. We consider a ring-shaped lattice of one-dimensional "atoms" with a single energy level. We express the Bloch states in the lattice as a linear combination of atomic orbitals. The discrete energy level splits into the energy band which serves as a simple model of the valence band. We show that the insulating ring (with the valence band fully filled by electrons) supports a nonzero persistent current, because each atomic orbital overlaps with its own tail when making one loop around the ring. In the tight-binding limit only the neighboring orbitals overlap. In that limit the persistent current at full filling becomes zero which is a standard result.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:22:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Moskova", "Antonia", "" ], [ "Mosko", "Martin", "" ], [ "Gendiar", "Andrej", "" ] ]
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712.0963
Steven Spallone
Adrian Jenkins and Steven Spallone
A p-adic approach to local analytic dynamics: analytic flows and analytic maps tangent to the identity
null
null
null
null
math.DS math.NT
null
In this note, we will consider the question of local equivalence of analytic functions which fix the origin and are tangent to the identity, as well as the question of flows of analytic vector fields. All mappings and equivalences are considered in the non-archimedean context e.g. all norms can be considered $p$-adic norms. We show that any two mappings $f$ and $g$ which are formally equivalent are also analytically equivalent, and we show that analytic vector fields generate analytic flows. We consider the related questions of roots and centralizers for analytic mappings. In this setting, anything which can be done formally can also be done analytically.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:26:35 GMT" } ]
2007-12-07T00:00:00
[ [ "Jenkins", "Adrian", "" ], [ "Spallone", "Steven", "" ] ]
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712.0964
Frank Aurzada
Frank Aurzada, Steffen Dereich, Michael Scheutzow and Christian Vormoor
High resolution quantization and entropy coding of jump processes
Preprint (submitted), 34 pages
Journal of Complexity 25 (2009), no. 2, 163-187
10.1016/j.jco.2008.10.002
null
math.PR
null
We study the quantization problem for certain types of jump processes. The probabilities for the number of jumps are assumed to be bounded by Poisson weights. Otherwise, jump positions and increments can be rather generally distributed and correlated. We show in particular that in many cases entropy coding error and quantization error have distinct rates. Finally, we investigate the quantization problem for the special case of $\mathbb{R}^d$-valued compound Poisson processes.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:27:21 GMT" } ]
2009-05-25T00:00:00
[ [ "Aurzada", "Frank", "" ], [ "Dereich", "Steffen", "" ], [ "Scheutzow", "Michael", "" ], [ "Vormoor", "Christian", "" ] ]
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712.0965
Nicolas Bavouzet
N. Bavouzet, H. Dole, E. Le Floc'h, K.I. Caputi, G. Lagache, C.S. Kochanek
Estimating the total infrared luminosity of galaxies up to z~2 from mid- and far-infrared observations
15 pages, 14 figures, 6 tables. Accepted for publication in A&A
Astron.Astrophys.479:83-96,2008
10.1051/0004-6361:20077896
null
astro-ph
null
We present the observed correlations between rest-frame 8, 24, 70 and 160 um monochromatic luminosities and measured total infrared luminosities L_IR of galaxies detected by Spitzer. Our sample consists of 372 star-forming galaxies with individual detections and flux measurements at 8, 24, 70 and 160 um. We have spectroscopic redshifts for 93% of these sources, and accurate photometric redshifts for the remainder. We also used a stacking analysis to measure the IR fluxes of fainter sources at higher redshifts. We show that the monochromatic mid and far-infrared luminosities are strongly correlated with the total infrared luminosity and our stacking analysis confirms that these correlations also hold at higher redshifts. We provide relations between monochromatic luminosities and total infrared luminosities L_IR that should be reliable up to z~2 (z~1.1) for ULIRGs (LIRGs). In particular, we can predict L_IR with accuracies of 37% and 54% from the 8 and 24 um fluxes, while the best tracer is the 70 um flux. Combining bands leads to slightly more accurate estimates. For example, combining the 8 and 24 um luminosities predicts L_IR with an accuracy of 34%. Our results are generally compatible with previous studies, and the small changes are probably due to differences in the sample selection criteria. We can rule out strong evolution in dust properties with redshift up to z~1. Finally, we show that infrared and sub-millimeter observations are complementary means of building complete samples of star-forming galaxies, with the former being more sensitive for z<~2 and the latter at higher z>~2.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:55:34 GMT" } ]
2009-08-17T00:00:00
[ [ "Bavouzet", "N.", "" ], [ "Dole", "H.", "" ], [ "Floc'h", "E. Le", "" ], [ "Caputi", "K. I.", "" ], [ "Lagache", "G.", "" ], [ "Kochanek", "C. S.", "" ] ]
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712.0966
Matthias Bergner
Matthias Bergner
On the Dirichlet problem for prescribed mean curvature equation over general domains
null
null
null
null
math.DG math.AP
null
We study and solve the Dirichlet problem for graphs of prescribed mean curvature in $\mathbb R^{n+1}$ over general domains $\Omega$ without requiring a mean convexity assumption. By using pieces of nodoids as barriers we first give sufficient conditions for the solvability in case of zero boundary values. Applying a result by Schulz and Williams we can then also solve the Dirichlet problem for boundary values satisfying a Lipschitz condition.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:30:11 GMT" } ]
2007-12-07T00:00:00
[ [ "Bergner", "Matthias", "" ] ]
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712.0967
Yusuf Ziya Umul
Yusuf Z. Umul
Universality of the de Broglie-Einstein velocity equation
2 pages, no figures
null
null
null
physics.gen-ph
null
The de Broglie-Einstein velocity equation is derived for a relativistic particle by using the energy and momentum relations in terms of wave and matter properties. It is shown that the velocity equation is independent from the relativistic effects and is valid also for the non-relativistic case. The results of this property is discussed.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:33:28 GMT" } ]
2007-12-07T00:00:00
[ [ "Umul", "Yusuf Z.", "" ] ]
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712.0968
David Dumas
David Dumas and Michael Wolf
Projective structures, grafting, and measured laminations
31 pages, 4 figures
Geom. Topol. 12 (2008) 351-386
10.2140/gt.2008.12.351
null
math.DG math.CV math.GT
null
We show that grafting any fixed hyperbolic surface defines a homeomorphism from the space of measured laminations to Teichmuller space, complementing a result of Scannell-Wolf on grafting by a fixed lamination. This result is used to study the relationship between the complex-analytic and geometric coordinate systems for the space of complex projective ($\CP^1$) structures on a surface. We also study the rays in Teichmuller space associated to the grafting coordinates, obtaining estimates for extremal and hyperbolic length functions and their derivatives along these grafting rays.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:34:38 GMT" } ]
2014-11-11T00:00:00
[ [ "Dumas", "David", "" ], [ "Wolf", "Michael", "" ] ]
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712.0969
Christof Wunderlich
M. Johanning, A. Braun, D. Eiteneuer, Chr. Paape, Chr. Balzer, W. Neuhauser, Chr. Wunderlich
Resonance enhanced isotope-selective photoionization of YbI for ion trap loading
9 pages. Considerably extended and revised version including new data
Applied Physics B 103, 327-338 (2011)
10.1007/s00340-011-4502-7
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutral Ytterbium (YbI) and singly ionized Ytterbium (YbII) is widely used in experiments in quantum optics, metrology and quantum information science. We report on the investigation of isotope selective two-photoionisation of YbI that allows for efficient loading of ion traps with YbII. Results are presented on two-colour (399 nm and 369 nm) and single-colour (399 nm) photoionisation and their efficiency is compared to electron impact ionisation. Nearly deterministic loading of a desired number of YbII ions into a linear Paul trap is demonstrated.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:36:22 GMT" }, { "version": "v2", "created": "Thu, 17 Jun 2010 11:27:52 GMT" } ]
2011-12-23T00:00:00
[ [ "Johanning", "M.", "" ], [ "Braun", "A.", "" ], [ "Eiteneuer", "D.", "" ], [ "Paape", "Chr.", "" ], [ "Balzer", "Chr.", "" ], [ "Neuhauser", "W.", "" ], [ "Wunderlich", "Chr.", "" ] ]
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712.097
Isabella Pagano
I. Pagano, F. Bacciotti, L. Bedin, F. Bracciaferri, E. Brocato, A. Bulgarelli, L. Buson, C. Cacciari, A. Capetti, A. Cassatella, E. Cavazzuti, R. Claudi, D. De Martino, G. De Paris, F. Ferraro, M. Fiorini, L. Gambicorti, A. Gherardi, F. Gianotti, D. Magrin, S. Marchi, G. Mulas, M. Munari, M. Nonino, E. Pace, M. Pancrazzi, E. Pian, G. Piotto, C. Pompei, C. Pontoni, G. Preti, S. Scuderi, S. Shore, M. Trifoglio, M. Turatto, M. Uslenghi
Field Camera Unit for WSO-UV: Phase A Study Report
The Phase A/B1 Study for the Italian Participation to WSO-UV has been funded by the Italian Space Agency. The activities have been carried out in the framework of the ASI-INAF Contract No. I/085/06/0
I. Pagano, R. Claudi, G. Piotto, S. Scuderi, & M. Trifoglio (eds.), Printed by Runner s.a.s. - Catania (Italy), Oct 2007
null
null
astro-ph
null
World Space Observatory UltraViolet (WSO-UV) is a multipurpose space observatory, made by a 170 cm aperture telescope, capable of UV high-resolution spectroscopy, long slit low-resolution spectroscopy, and deep UV and optical imaging. With a nominal mission life time of 5 years, and a planned extension to 10 years, from a geosynchronous orbit with an inclination of 51.8 degrees, WSO-UV will provide observations of exceptional importance for the study of many unsolved astrophysical problems. WSO-UV is implemented in the framework of a collaboration between Russia (chair), China, Germany, Italy, Spain, and Ukraine. This book illustrates the results of the feasibility study for the Field Camera Unit (FCU), a multi-spectral radial instrument on the focal plane of WSO-UV. The book provides an overview of the key science topics that are drivers to the participation of the Italian astronomical community in the WSO-UV project. The science drivers here illustrated have been used to define the technical requirements for the conceptual and architectural design of the Field Camera Unit (FCU) focal plane instrument. In Chapter I we show that WSO-UV will give a significant contribution to solve the key astronomical problems individuated by the ASTRONET consortium, and which are driving the European Space Agency Cosmic Vision program. Chapter II elucidates the scientific requirements for WSO-UV FCU instrument, discussed in Chapter I, which are translated in a list of verifiable top level requirements usable to make the conceptual design of the FCU instrument. Chapter III is dedicated to the Field Camera Unit opto-mechanical design, its detectors and electronics subsystems. Finally, Chapter IV outlines the AIV and GSE plans and activities for the FCU instrument.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 13:19:24 GMT" } ]
2007-12-07T00:00:00
[ [ "Pagano", "I.", "" ], [ "Bacciotti", "F.", "" ], [ "Bedin", "L.", "" ], [ "Bracciaferri", "F.", "" ], [ "Brocato", "E.", "" ], [ "Bulgarelli", "A.", "" ], [ "Buson", "L.", "" ], [ "Cacciari", "C.", "" ], [ "Capetti", "A.", "" ], [ "Cassatella", "A.", "" ], [ "Cavazzuti", "E.", "" ], [ "Claudi", "R.", "" ], [ "De Martino", "D.", "" ], [ "De Paris", "G.", "" ], [ "Ferraro", "F.", "" ], [ "Fiorini", "M.", "" ], [ "Gambicorti", "L.", "" ], [ "Gherardi", "A.", "" ], [ "Gianotti", "F.", "" ], [ "Magrin", "D.", "" ], [ "Marchi", "S.", "" ], [ "Mulas", "G.", "" ], [ "Munari", "M.", "" ], [ "Nonino", "M.", "" ], [ "Pace", "E.", "" ], [ "Pancrazzi", "M.", "" ], [ "Pian", "E.", "" ], [ "Piotto", "G.", "" ], [ "Pompei", "C.", "" ], [ "Pontoni", "C.", "" ], [ "Preti", "G.", "" ], [ "Scuderi", "S.", "" ], [ "Shore", "S.", "" ], [ "Trifoglio", "M.", "" ], [ "Turatto", "M.", "" ], [ "Uslenghi", "M.", "" ] ]
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712.0971
Vladimir Karmanov
V.A. Karmanov, J. Carbonell and M. Mangin-Brinet
Electromagnetic form factor via Minkowski and Euclidean Bethe-Salpeter amplitudes
3 pages, 2 figures. Contribution to the proceedings of the 20th International Conference on Few-Body Problems in Physics (FB20), Pisa, Italy, September 10-14, 2007. To be published in "Few-Body Systems"
Few Body Syst.44:283-286,2008
10.1007/s00601-008-0309-4
null
hep-ph
null
The electromagnetic form factors calculated through Euclidean Bethe-Salpeter amplitude and through the light-front wave function are compared with the one found using the Bethe-Salpeter amplitude in Minkowski space. The form factor expressed through the Euclidean Bethe-Salpeter amplitude (both within and without static approximation) considerably differs from the Minkowski one, whereas form factor found in the light-front approach is almost indistinguishable from it.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:50:53 GMT" } ]
2009-01-16T00:00:00
[ [ "Karmanov", "V. A.", "" ], [ "Carbonell", "J.", "" ], [ "Mangin-Brinet", "M.", "" ] ]
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712.0972
Jie Sun
Jie Sun, Ruoyuan Li, Chang Zhao, Like Yu, Xiaoling Ye, Bo Xu, Yonghai Chen and Zhanguo Wang
Room temperature observation of electron resonant tunneling through InAs/AlAs quantum dots
First time observation of electron resonant tunneling through InAs quantum dots
null
null
null
cond-mat.mes-hall
null
Molecular beam epitaxy is employed to manufacture self-assembled InAs/AlAs quantum-dot resonant tunneling diodes. Resonant tunneling current is superimposed on the thermal current, and they make up the total electron transport in devices. Steps in current-voltage characteristics and peaks in capacitance-voltage characteristics are explained as electron resonant tunneling via quantum dots at 77K or 300K, and this is the first time that resonant tunneling is observed at room temperature in III-V quantum-dot materials. Hysteresis loops in the curves are attributed to hot electron injection/emission process of quantum dots, which indicates the concomitant charging/discharging effect.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:44:15 GMT" } ]
2007-12-07T00:00:00
[ [ "Sun", "Jie", "" ], [ "Li", "Ruoyuan", "" ], [ "Zhao", "Chang", "" ], [ "Yu", "Like", "" ], [ "Ye", "Xiaoling", "" ], [ "Xu", "Bo", "" ], [ "Chen", "Yonghai", "" ], [ "Wang", "Zhanguo", "" ] ]
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712.0973
Martin Depken
Martin Depken, Helmut Schiessel
Nucleosome shape dictates chromatin-fiber structure
13 pages, 3 figures, 1 table, and supporting notes
null
null
null
q-bio.OT
null
Apart from being the gateway for all access to the eukaryotic genome, chromatin has in recent years been identified as carrying an epigenetic code regulating transcriptional activity. The detailed knowledge of this code contrasts the ignorance of the fiber structure which it regulates, and none of the suggested fiber models are capable of predicting the most basic quantities of the fiber (diameter, nucleosome line density, etc.). We address this three-decade-old problem by constructing a simple geometrical model based on the nucleosome shape alone. Without fit parameters we predict the observed properties of the condensed chromatin fiber (e.g. its 30 nm diameter), the structure, and how the fiber changes with varying nucleosome repeat length. Our approach further puts the plethora of previously suggested models within a coherent framework, and opens the door to detailed studies of the interplay between chromatin structure and function.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:52:33 GMT" } ]
2007-12-07T00:00:00
[ [ "Depken", "Martin", "" ], [ "Schiessel", "Helmut", "" ] ]
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712.0974
Stephen E. Fienberg
Stephen E. Fienberg
Editorial: Statistics and forensic science
Published in at http://dx.doi.org/10.1214/07-AOAS140 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Statistics 2007, Vol. 1, No. 2, 285-286
10.1214/07-AOAS140
IMS-AOAS-AOAS140
stat.AP
null
Forensic science is usually taken to mean the application of a broad spectrum of scientific tools to answer questions of interest to the legal system. Despite such popular television series as CSI: Crime Scene Investigation and its spinoffs--CSI: Miami and CSI: New York--on which the forensic scientists use the latest high-tech scientific tools to identify the perpetrator of a crime and always in under an hour, forensic science is under assault, in the public media, popular magazines [Talbot (2007), Toobin (2007)] and in the scientific literature [Kennedy (2003), Saks and Koehler (2005)]. Ironically, this growing controversy over forensic science has occurred precisely at the time that DNA evidence has become the ``gold standard'' in the courts, leading to the overturning of hundreds of convictions many of which were based on clearly less credible forensic evidence, including eyewitness testimony [Berger (2006)].
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:42:37 GMT" } ]
2009-09-29T00:00:00
[ [ "Fienberg", "Stephen E.", "" ] ]
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712.0975
Andreas Winter
Patrick Hayden, Peter W. Shor, Andreas Winter
Random quantum codes from Gaussian ensembles and an uncertainty relation
9 pages, two-column style. This paper is a companion to quant-ph/0702005 and quant-ph/0702006
Open Syst. Inf. Dyn. 15 (2008) 71-89
10.1142/S1230161208000079
null
quant-ph cs.IT math.IT
null
Using random Gaussian vectors and an information-uncertainty relation, we give a proof that the coherent information is an achievable rate for entanglement transmission through a noisy quantum channel. The codes are random subspaces selected according to the Haar measure, but distorted as a function of the sender's input density operator. Using large deviations techniques, we show that classical data transmitted in either of two Fourier-conjugate bases for the coding subspace can be decoded with low probability of error. A recently discovered information-uncertainty relation then implies that the quantum mutual information for entanglement encoded into the subspace and transmitted through the channel will be high. The monogamy of quantum correlations finally implies that the environment of the channel cannot be significantly coupled to the entanglement, and concluding, which ensures the existence of a decoding by the receiver.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:47:29 GMT" } ]
2012-07-06T00:00:00
[ [ "Hayden", "Patrick", "" ], [ "Shor", "Peter W.", "" ], [ "Winter", "Andreas", "" ] ]
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712.0976
Michael Bachmann
Anna Kallias, Michael Bachmann, and Wolfhard Janke
Thermodynamics and Kinetics of a Go Proteinlike Heteropolymer Model with Two-State Folding Characteristics
8 pages, 9 figures
J. Chem. Phys. 128, 055102 (2008).
10.1063/1.2822287
null
cond-mat.soft
null
We present results of Monte Carlo computer simulations of a coarse-grained hydrophobic-polar Go-like heteropolymer model and discuss thermodynamic properties and kinetics of an exemplified heteropolymer, exhibiting two-state folding behavior. It turns out that general, characteristic folding features of realistic proteins with a single free-energy barrier can also be observed in this simplified model, where the folding transition is primarily driven by the hydrophobic force.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:47:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Kallias", "Anna", "" ], [ "Bachmann", "Michael", "" ], [ "Janke", "Wolfhard", "" ] ]
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712.0977
Lee Smolin
Lee Smolin
The Plebanski action extended to a unification of gravity and Yang-Mills theory
12 pages, one figure, Corrected and improved version
Phys.Rev.D80:124017,2009
10.1103/PhysRevD.80.124017
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a unification of gravity with Yang-Mills fields based on a simple extension of the Plebanski action to a Lie group G which contains the local lorentz group. The Coleman-Mandula theorem is avoided because the theory has no global spacetime symmetry. This may be applied to Lisi's proposal of an E8 unified theory, giving a fully E8 invariant action. The extended form of the Plebanski action suggests a new class of spin foam models.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:51:16 GMT" }, { "version": "v2", "created": "Fri, 25 Jul 2008 15:45:05 GMT" } ]
2009-12-30T00:00:00
[ [ "Smolin", "Lee", "" ] ]
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712.0978
Martin Michael M\"uller
Jemal Guven, Martin Michael Mueller
How paper folds: bending with local constraints
20 pages, 1 figure
J. Phys. A: Math. Theor. 41 (2008) 055203.
10.1088/1751-8113/41/5/055203
null
cond-mat.other cond-mat.soft cond-mat.stat-mech
null
A variational framework is introduced to describe how a surface bends when it is subject to local constraints on its geometry. This framework is applied to describe the patterns of a folded sheet of paper. The unstretchability of paper implies a constraint on the surface metric; bending is penalized by an energy quadratic in mean curvature. The local Lagrange multipliers enforcing the constraint are identified with a conserved tangential stress that couples to the extrinsic curvature of the sheet. The framework is illustrated by examining the deformation of a flat sheet into a generalized cone.
[ { "version": "v1", "created": "Thu, 6 Dec 2007 15:52:32 GMT" } ]
2008-01-24T00:00:00
[ [ "Guven", "Jemal", "" ], [ "Mueller", "Martin Michael", "" ] ]
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