H\"older regularity and exponential decay of correlations for a class of piecewise partially hyperbolic maps

TL;DR

This paper proves H"older regularity and exponential decay of correlations for a class of piecewise partially hyperbolic maps with non-uniform expansion, spectral gap, and invariant measures.

Contribution

It establishes spectral gap and regularity results for transfer operators of piecewise partially hyperbolic maps with discontinuities.

Findings

Spectral gap for transfer operator on anisotropic spaces.

H"older regularity of invariant measure disintegration.

Exponential decay of correlations for H"older functions.

Abstract

We consider a class of endomorphisms which contains a set of piecewise partially hyperbolic skew-products with a non-uniformly expanding base map. The aimed transformation preserves a foliation which is almost everywhere uniformly contracted with possible discontinuity sets, which are parallel to the contracting direction. We prove that the associated transfer operator, acting on suitable anisotropic normed spaces, has a spectral gap (on which we have quantitative estimation) and the disintegration of the unique invariant physical measure, along the stable leaves, is $\zeta$-H\"older. We use this fact to obtain exponential decay of correlations on the set of $\zeta$-H\"older functions.