Dynamical Systems Seminar

Title: Measures of maximal entropy that are SRB
Speaker: Raúl Ures
Speaker Info: SUSTech
Brief Description:
Special Note:

How often does it occur that the measure of maximal entropy of a system is an SRB measure? We study this question for partially hyperbolic diffeomorphisms isotopic to Anosov (DA-diffeomorphisms) on the 3-torus, and establish a rigidity result: the measure of maximal entropy is an SRB measure if and only if the sum of its positive Lyapunov exponents coincides with that of the linear Anosov map A on all periodic orbits of the support of the measure. In that case, the measure is also the unique physical measure. We also show non-Anosov examples satisfying this condition, both in the conservative and in the non-conservative setting.

Finally, we prove that a volume-preserving DA-diffeomorphism on the 3-torus is Anosov if all Lyapunov exponents coincide almost everywhere with those of the linear Anosov in the isotopy class. Consequently, a smooth DA-diffeomorphism is smoothly conjugated to its linear part if and only if all Lyapunov exponents coincide almost everywhere with those of its linear part. This talk is based in a joint work with Fernando Micena, Ryo More, and Jana Rodriguez Hertz.

Date: Wednesday, April 24, 2024
Time: 3:00pm
Where: Lunt 107
Contact Person: Solly Coles
Contact email: solly.coles@northwestern.edu
Contact Phone: 8477128513
Copyright © 1997-2024 Department of Mathematics, Northwestern University.