Analyticity of the Lyapunov exponents of random products of quasi-periodic cocycles

Abstract

We show that the top Lyapunov exponent ${\lambda }_{+}(p)$ , $p=(p_1,\cdots ,p_N)$ with $p_i>0$ for each $i$, associated with a random product of quasi-periodic cocycles depends real analytically on the transition probabilities $p$ whenever ${\lambda }_{+}(p)$ is simple. Moreover if the spectrum at $p$ is simple (all Lyapunov exponents having multiplicity one ) then all Lyapunov exponents depend real analytically on $p$.

17 pages