Counting geodesics on a Riemannian manifold and topological entropy of geodesic flows

Details Counting geodesics on a Riemannian manifold and topological entropy of geodesic flows Counting geodesics on a Riemannian manifold and topological entropy of geodesic flows

1996-10-25

arxiv.org/abs/math/9610223v1

Mathematics

Dynamical Systems

Scientific paper

Let $M$ be a compact $C^{\infty}$ Riemannian manifold. Given $p$ and $q$ in $M$ and $T>0$, define $n_{T}(p,q)$ as the number of geodesic segments joining $p$ and $q$ with length $\leq T$. Ma\~n\'e showed that the exponential growth rate of the integral of $n_{T}(p,q)$ over $M \times M$ is the topological entropy of the geodesic flow of $M$. In the present paper we exhibit an open set of metrics on the two-sphere for which the exponential growth rate of $n_{T}(p,q$ is less than the topological entropy of the geodesic flow for a positive measure set of $(p,q)\in M\times M$. This answers in the negative questions raised by Ma\~n\'e.

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