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Superstatistics in random matrix theory
Faculty
Science
Year:
2006
Type of Publication:
Article
Pages:
41-54
Authors:
Abul-Magd, AY
DOI:
10.1016/j.physa.2005.07.019
Journal:
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS ELSEVIER SCIENCE BV
Volume:
361
Research Area:
Physics
ISSN
ISI:000235533200005
Keywords :
superstatistics, non-extensive statistics, random-matrix theory, mixed systems
Abstract:
Using the superstatistics method, we propose an extension of the random matrix theory to cover systems with mixed regular-chaotic: dynamics. Unlike most of the other works in this direction, the ensembles of the proposed approach are basis invariant but the matrix elements are not statistically independent. Spectral characteristics of the mixed systems are expressed by averaging the corresponding quantities in the standard random-matrix theory over the fluctuations of the inverse variance of the matrix elements. We obtain analytical expressions for the level density and the nearest-neighbor-spacing distributions for four different inverse-variance distributions. The resulting expressions agree with each other for small departures from chaos, measured by an effective non-extensivity parameter. Our results suggest, among other things, that superstatistics is suited only for the initial stage of transition from chaos to regularity. (c) 2005 Elsevier B.V. All rights reserved.
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