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Friday, March 20, 2026
2:00 PM - 3:00 PM
Linde Hall 310

Geometry and Topology Seminar

Asymptotically geodesic hypersurfaces and the fundamental groups of hyperbolic manifolds
Hans Han, Assistant Professor of Mathematics, Department of Mathematics, Shanghai Institute for Mathematics and Interdisciplinary Sciences (SIMIS),

Let M be a closed hyperbolic manifold. A sequence of closed, smoothly immersed hypersurfaces in M (up to homotopy and commensurability) is called asymptotically geodesic if the hypersurfaces are eventually totally geodesic. We show that if M contains such a sequence, its fundamental group is virtually special and thus a linear group with integer coefficients. If, in addition, M is arithmetic of type I, we build a sequence of asymptotically geodesic, strongly filling hypersurfaces that are equidistributing in the Grassmann bundles, where strongly filling implies a hypersurface having essential intersection with every geodesic.

This partially answers a question of Ben Lowe regarding the gap of hypersurfaces in higher dimensional hyperbolic manifolds and is a joint work with Ruojing Jiang.

For more information, please contact Math Department by phone at 626-395-4335 or by email at [email protected] or visit https://caltech.zoom.us/j/89155661233.