A vector valued almost sure invariance principle for time dependent non-uniformly expanding dynamical systems

Abstract: We prove a vector-valued almost sure invariance principle for some classes of time dependent non-uniformly distance expanding dynamical systems. The models we have in mind are certain sequential versions of the smooth non-uniformly distance expanding maps considered in \cite{castro} and \cite{Vara}, as well as certain types of sequences of covering maps. Our results rely on the theory of complex projective metrics which was developed in \cite{Rug}, together with the spectral methods of Gou\"ezel \cite{GO}. A big advantage in applying the theory of complex cones here is that it also yields additional probabilistic limit theorems for random dynamical systems, as described at the last section of this paper.