Events for 03/01/2023 from all calendars

Noncommutative Geometry Seminar

Time: 2:00PM - 3:00PM

Location: BLOC 302

Speaker: Bo Zhu, TAMU

Title: Metric structure of Riemannian manifolds involving their curvature II

Groups and Dynamics Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 302

Speaker: Frank Lin, Texas A&M University

Title: Entropy and quantitative orbit equivalence

Abstract: In the setting of probability measure preserving group actions, two systems are orbit equivalent if their orbits can be matched almost everywhere in a measurable fashion. Orbit equivalence is much weaker than measure conjugacy in general, but various authors have shown that entropy is invariant under certain stronger notions of quantitative orbit equivalence. We introduce some of these results, including (in joint work with Lewis Bowen) the invariance of the f-invariant- a generalization of Kolmogorov-Sinai entropy to actions of free groups - under bounded orbit equivalence.