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Author

Ara Basmajian

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Preprint Aug 2026

The entropy spectrum of hyperbolic surfaces

This article introduces and studies the entropy spectrum of a hyperbolic surface, that is the set of entropies of its subsurfaces. The main results are that the entropy spectrum is a reverse well-ordered multiset, with finite multiplicities, and that there is a quantifiable gap around the value $1$. This gap comes from...

Ara Basmajian, Hugo Parlier · 0 citations
Preprint Sep 2026

A topological version of Huber's theorem

Let $X$ be a closed hyperbolic surface. We prove that the number of topological types of primitive closed geodesics of length at most $L$ is asymptotic to \[ \frac{1}{|\Isom(X)|}\frac{e^L}{2L}. \] as $L$ grows. Thus Huber's asymptotic remains unchanged after quotienting by topological type, up to the finite symmetry fa...

Ara Basmajian, Hugo Parlier · 0 citations

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