Stochastic stability for partially hyperbolic diffeomorphisms with mostly expanding and contracting centers

Abstract

We prove the stochastic stability of an open class of partially hyperbolic diffeomorphisms, each of which admits two centers E c 1 and E c 2 such that any Gibbs u-state admits only positive (resp. negative) Lyapunov exponents along E c 1 (resp. E c 2 ).