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arXiv · 2407.03134

Refined Counting of Geodesic Segments in the Hyperbolic Plane

Marios Voskou
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Abstract

For $\Gamma$ a cofinite Fuchsian group, and $l$ a fixed closed geodesic, we study the asymptotics of the number of those images of $l$ that have a prescribed orientation and distance from $l$ less than or equal to $X$. Using a new relative trace formula that we develop, we give a new concrete proof of the error bound $O(X^{2/3})$ that appears in the works of Good and Hejhal. Furthermore, we prove a new bound $O(X^{1/2}\log{X})$ for the mean square of the error. For particular arithmetic groups, we provide interpretations in terms of correlation sums of the number of ideals of norm at most $X$ in associated number fields, generalizing previous examples due to Hejhal.

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Marios Voskou. 2024-07-03. Refined Counting of Geodesic Segments in the Hyperbolic Plane. https://arxiv.org/abs/2407.03134

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