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Department of Mathematics,
University of California San Diego

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Math 211B - Group Actions Seminar

Zuo Lin

UCSD

Distribution of dense lattice orbits on homogeneous spaces

Abstract:

Let $H < G$ both be noncompact connected semisimple real algebraic groups and $\Gamma < G$ be a lattice. In the work of Gorodnik--Weiss, they showed that the distribution of dense $\Gamma$-orbit on homogeneous space $G/H$ is asymptotically the same as $G$-orbit on $G/H$. One key ingredient in their proof is Shah's theorem derived from the famous Ratner's theorem. In this talk, we report an effective version of this result in the case $(G, H, \Gamma) = (\mathrm{SL}_3(\mathbb{R}), \mathrm{SO}(2, 1), \mathrm{SL}_3(\mathbb{Z}))$. The proof uses recent progress by Lindenstrauss--Mohammadi--Wang--Yang towards an effective version of Ratner's theorem. We also prove the general case if an effective version of Ratner's theorem is provided. The talk is based on an ongoing work with Pratyush Sarkar.

Host: Brandon Seward

December 7, 2023

10:00 AM

APM 7321

Research Areas

Ergodic Theory and Dynamical Systems

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