Dynamical Systems Seminar

Title: Horocycle orbits in strata of translation surfaces
Speaker: Jon Chaika
Speaker Info: University of Utah
Brief Description:
Special Note:

Ratner, Margulis, Dani and many others, showed that the horocycle flow on homogeneous spaces has strong measure theoretic and topological rigidity properties. Eskin-Mirzakhani and Eskin-Mirzakhani-Mohommadi, showed that the action of SL(2,R) and the upper triangular subgroup of SL(2,R) on strata of translation surfaces have similar rigidity properties. We will describe how some of these results fail for the horocycle flow on strata of translation surfaces. In particular,

1) There exist horocycle orbit closures with fractional Hausdorff dimension.

2) There exist points which do not equidistribute under the horocycle flow with respect to any measure.

3) There exist points which equidistribute distribute under the horocycle flow to a measure, but they are not in the topological support of that measure.

This is joint work with John Smillie and Barak Weiss.

Date: Tuesday, May 08, 2018
Time: 4:00pm
Where: Lunt 105
Contact Person: Prof. Bryna Kra
Contact email: kra@math.northwestern.edu
Contact Phone: 847-491-5567
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