Geometry of Anosov Flows and Rigidity - 3/4

Explore the geometric properties of Anosov flows and their applications to rigidity theory in this advanced mathematics lecture. Begin with an introduction to Anosov flows as dynamical systems where vectors experience uniform expansion or contraction, using the geodesic flow on negatively curved manifolds as a fundamental example. Examine the geometric structure of these systems, including invariant manifolds, ergodicity properties, and regularity questions that arise in their study. Delve into compact group extensions of Anosov flows and discover the associated "Brin group," which functions as a Galois group for these extensions. Apply these theoretical tools to understand a significant rigidity result: when a compact negatively curved real-analytic Riemannian manifold contains infinitely many totally geodesic hypersurfaces, it must have constant sectional curvature. Gain insight into the deep connections between dynamical systems theory, differential geometry, and rigidity phenomena in modern mathematics through this comprehensive mathematical exposition delivered by Simion Filip from the University of Chicago.