Behavior of the SRB Entropy Functional in Families of Hyperbolic Attractors and Expanding Maps

Abstract

We review the current state of the study of the SRB entropy functional over open components of families of uniformly hyperbolic systems, including Anosov systems, hyperbolic attractors, expanding maps, and Markov transformations. We address problems concerning the functional's infimum, supremum, and local extrema; the gradient flow induced by the functional; and the functional's behavior near the boundary of open components.