Positivity of Lyapunov exponents for Anderson-type models on two coupled strings
Date
2007-03-20
Authors
Boumaza, Hakim
Stolz, Gunter
Journal Title
Journal ISSN
Volume Title
Publisher
Texas State University-San Marcos, Department of Mathematics
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.
Description
Keywords
Random operators, Anderson model, Lyapunov exponents
Citation
Boumaza, H., & Stolz, G. (2007). Positivity of Lyapunov exponents for Anderson-type models on two coupled strings. <i>Electronic Journal of Differential Equations, 2007</i>(47), pp. 1-18.
Rights
Attribution 4.0 International