Counting problems for geodesics on arithmetic hyperbolic surfaces

Linowitz, Benjamin

doi:10.1090/proc/13782

Counting problems for geodesics on arithmetic hyperbolic surfaces
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Proc. Amer. Math. Soc. 146 (2018), 1347-1361 Request permission

Abstract:

It is a longstanding problem to determine the precise relationship between the geodesic length spectrum of a hyperbolic manifold and its commensurability class. A well-known result of Reid, for instance, shows that the geodesic length spectrum of an arithmetic hyperbolic surface determines the surface’s commensurability class. It is known, however, that non-commensurable arithmetic hyperbolic surfaces may share arbitrarily large portions of their length spectra. In this paper we investigate this phenomenon and prove a number of quantitative results about the maximum cardinality of a family of pairwise non-commensurable arithmetic hyperbolic surfaces whose length spectra all contain a fixed (finite) set of non-negative real numbers.

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