Rigidity of Lyapunov exponents for derived from Anosov diffeomorphisms

José Santana Costa, Ali Tahzibi

Published 2023-10-10Version 1

For a class of volume preserving partially hyperbolic diffeomorphisms (or non-uniformly Anosov) $f:\mathbb{T}^d \rightarrow \mathbb{T}^d$ homotopic to linear Anosov automorphism, we show that the sum of the positive (negative) Lyapunov exponents of $f$ is bounded above (resp. below) by the sum of the positive (resp. negative) Lyapunov exponents of its linearization. We show this for some classes of derived from Anosov (DA) and non-uniformly hyperbolic systems with dominated splitting, in particular for examples described by Bonatti and Viana.