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arXiv · 1711.10542

Exceptional directions for the Teichm\"{u}ller geodesic flow and Hausdorff dimension

Hamid Al-Saqban·Paul Apisa·Alena Erchenko·Osama Khalil·Shahriar Mirzadeh·Caglar Uyanik
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Abstract

We prove that for every flat surface $\omega$, the Hausdorff dimension of the set of directions in which Teichm\"{u}ller geodesics starting from $\omega$ exhibit a definite amount of deviation from the correct limit in Birkhoff's and Oseledets' Theorems is strictly less than $1$. This theorem extends a result by Chaika and Eskin where they proved that such sets have measure $0$. We also prove that the Hausdorff dimension of the directions in which Teichm\"{u}ller geodesics diverge on average in a stratum is bounded above by $1/2$, strengthening a classical result due to Masur. Moreover, we show that the Hausdorff codimension of the set of non-weakly mixing IETs with permutation $(d, d-1, \dots, 1)$, where $d$ is an odd number, is exactly $1/2$ and strengthen a result by Avila and Leguil.

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Hamid Al-Saqban, Paul Apisa, Alena Erchenko, Osama Khalil, Shahriar Mirzadeh, Caglar Uyanik. 2017-11-28. Exceptional directions for the Teichm\"{u}ller geodesic flow and Hausdorff dimension. https://doi.org/10.4171/jems%2F1037

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