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Positivity of Lyapunov exponents for Anderson-type models on two coupled strings

Authors
  • Boumaza, Hakim
  • Stolz, Günter
Type
Preprint
Publication Date
Nov 01, 2006
Submission Date
Nov 01, 2006
Identifiers
arXiv ID: math-ph/0611001
Source
arXiv
License
Unknown
External links

Abstract

We study two models of Anderson-type random operators on two deterministically coupled continuous strings. Each model is associated with independent, identically distributed four-by-four symplectic transfer matrices, which describe the asymptotics of solutions. In each case we use a criterion by Gol'dsheid and Margulis (i.e. Zariski denseness of the group generated by the transfer matrices in the group of symplectic matrices) to prove positivity of both leading Lyapunov exponents for most energies. In each case this implies almost sure absence of absolutely continuous spectrum (at all energies in the first model and for sufficiently large energies in the second model). The methods used allow for singularly distributed random parameters, including Bernoulli distributions.

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