Lyapunov exponents at anomalies of SL(2,R)-actions

Details Lyapunov exponents at anomalies of SL(2,R)-actions Lyapunov exponents at anomalies of SL(2,R)-actions

2006-07-12

arxiv.org/abs/math-ph/0607026v1

Operator Theory: Advances and Applications, OTAMP Proceedings 2002, Bedlewo, Birkhaeuser

Physics

Mathematical Physics

Scientific paper

Anomalies are known to appear in the perturbation theory for the one-dimensional Anderson model. A systematic approach to anomalies at critical points of products of random matrices is developed, classifying and analysing their possible types. The associated invariant measure is calculated formally. For an anomaly of so-called second degree, it is given by the groundstate of a certain Fokker-Planck equation on the unit circle. The Lyapunov exponent is calculated to lowest order in perturbation theory with rigorous control of the error terms.

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