Sebastian Burgos | Searcharxiv

arXiv2024

On the structure of the Birkhoff-irregular set for subshifts of finite type

We study the set of irregular points for topologically mixing subshifts of finite type. It is well known that despite the irregular set having zero measure for every invariant measure, it has full topological entropy and full Hausdorff dimension. We establish that for these systems the irregular set is not only abundant in terms of its dimensional properties, but also contains uncountably many pairwise disjoint invariant subsets, each of them dense and carrying full topological entropy and Hausdorff dimension. This results deepens our understanding of the complexity of irregular points in dynamical systems, highlighting their intricate structure and suggesting avenues for further explorations in related areas.

math.DS↗

arXiv2023

Decay of Correlations for some Non-Uniformly Hyperbolic Attractors

A classical problem in smooth dynamical systems is known as smooth realization problem. It asks if given a compact manifold $M$, one can construct a volume preserving diffeomorphism with prescribed ergodic properties. We study the decay of correlations for certain dynamical systems with non-uniformly hyperbolic attractors, which natural invariant measure is not the volume, but the SRB measure. The system $g$ that we consider is produced by applying the slow-down procedure to a uniformly hyperbolic diffeomorphism $f$ with an attractor. Under certain assumptions on the map $f$ and the slow-down neighborhood, we show that the map $g$ admits polynomial upper and lower bounds on correlations with respect to its SRB measure and the class of H\"older continuous potentials. Our results apply to the Smale-Williams solenoid, as well as its sufficiently small perturbations.

math.DS↗