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Limits of geodesic push-forwards of horocycle invariant measures

Part of: Noncompact transformation groups Ergodic theory Riemann surfaces Low-dimensional topology

Published online by Cambridge University Press:  23 October 2020

GIOVANNI FORNI
GIOVANNI FORNI*
Affiliation:
Department of Mathematics, University of Maryland, College Park, MD, USA (e-mail: gforni@math.umd.edu)
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Abstract

We prove several general conditional convergence results on ergodic averages for horocycle and geodesic subgroups of any continuous $\operatorname {SL}(2, \mathbb {R})$ -action on a locally compact space. These results are motivated by theorems of Eskin, Mirzakhani and Mohammadi on the $\operatorname {SL}(2, \mathbb {R})$ -action on the moduli space of Abelian differentials. By our argument we can derive from these theorems an improved version of the ‘weak convergence’ of push-forwards of horocycle measures under the geodesic flow and a short proof of weaker versions of theorems of Chaika and Eskin on Birkhoff genericity and Oseledets regularity in almost all directions for the Teichmüller geodesic flow.

Keywords

Teichmüller horocycle flowpointwise equidistributionBirkhoff ergodic theoremOseledets multiplicative ergodic theorem

MSC classification

Primary: 37A30: Ergodic theorems, spectral theory, Markov operators 30F60: Teichmüller theory
Secondary: 22F30: Homogeneous spaces 57M60: Group actions in low dimensions
Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 41 , Issue 9 , September 2021 , pp. 2782 - 2804
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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