Equidistribution of Horocyclic Flows on Complete Hyperbolic Surfaces of Finite Area

Details Equidistribution of Horocyclic Flows on Complete Hyperbolic Surfaces of Finite Area Equidistribution of Horocyclic Flows on Complete Hyperbolic Surfaces of Finite Area

2007-12-08

arxiv.org/abs/0712.1300v2

Mathematics

Dynamical Systems

29 pages, 10 figures

Scientific paper

We provide a self-contained, accessible introduction to Ratner's Equidistribution Theorem in the special case of horocyclic flow on a complete hyperbolic surface of finite area. This equidistribution result was first obtained in the early 1980s by Dani and Smillie and later reappeared as an illustrative special case of Ratner's work on the equidistribution of unipotent flows in homogeneous spaces. We also prove an interesting probabilistic result due to Breuillard: on the modular surface an arbitrary uncentered random walk on the horocycle through almost any point will fail to equidistribute, even though the horocycles are themselves equidistributed. In many aspects of this exposition we are indebted to Bekka and Mayer's more ambitious survey, "Ergodic Theory and Topological Dynamics for Group Actions on Homogeneous Spaces."

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