Fluctuations of ergodic sums  for horocycle flows on $\Z^d$--covers of finite volume surfaces

François Ledrappier; Omri Sarig

doi:10.3934/dcds.2008.22.247

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2008, Volume 22, Issue 1&2: 247-325. Doi: 10.3934/dcds.2008.22.247

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Fluctuations of ergodic sums for horocycle flows on $\Z^d$--covers of finite volume surfaces

François Ledrappier^1, and
Omri Sarig^2,

1.
Department of Mathematics, 255 Hurley Hall, University of Notre Dame, Notre Dame IN 46556-4618
2.
Department of Mathematics, The Pennsylvania State University, University Park, PA 16802

Received: August 31, 2007

Published: February 2008

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Abstract

We study the almost sure asymptotic behavior of the ergodic sums of $L^1$--functions, for the infinite measure preserving system given by the horocycle flow on the unit tangent bundle of a $\Z^d$--cover of a hyperbolic surface of finite area, equipped with the volume measure. We prove rational ergodicity, identify the return sequence, and describe the fluctuations of the ergodic sums normalized by the return sequence. One application is a 'second order ergodic theorem': almost sure convergence of properly normalized ergodic sums, subject to a certain summability method (the ordinary pointwise ergodic theorem fails for infinite measure preserving systems).

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Mathematics Subject Classification: Primary: 37A17, 58F17; Secondary: 37A40.

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