Exponential Growth of Products of Non-Stationary Markov-Dependent Matrices

Let (ξj)j≥1 be a non-stationary Markov chain with phase space X and let gj:X↦SL(m,R) be a sequence of functions on X with values in the unimodular group. Set gj=gj(ξj) and denote by Sn=gn…g1⁠, the product of the matrices gj⁠. We provide sufficient conditions for exponential growth of the norm ∥Sn∥ when the Markov chain is not supposed to be stationary. This generalizes the classical theorem of Furstenberg on the exponential growth of products of independent identically distributed matrices as well as its extension by Virtser to products of stationary Markov-dependent matrices