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arXiv · 2305.18625

Equidistribution of $q$-orbits of closed geodesics

Asbjørn Christian Nordentoft
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Abstract

Given an element of $(\mathbb{Z}/q\mathbb{Z})^\times$ we associate a closed geodesic on the modular surface. We prove that the closed geodesics associated to cosets of sufficiently large subgroups equidistribute in the unit tangent bundle as $q$ tends to infinity. This is a $q$-orbit analogue of Duke's theorem for real quadratic fields as extended to subgroups by Popa. Finally, we show that the homology classes of the $q$-orbits of oriented closed geodesics concentrate around the Eisenstein line and present group theoretic applications.

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Asbjørn Christian Nordentoft. 2023-05-29. Equidistribution of $q$-orbits of closed geodesics. https://arxiv.org/abs/2305.18625

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