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Bibliographic Details
Main Authors:	De Blasi, Irene, Takeuchi, Airi, Terracini, Susanna
Format:	Preprint
Published:	2025
Subjects:	Dynamical Systems
Online Access:	https://arxiv.org/abs/2509.17132
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This paper deals with the so-called Boltzmann billiard, that is, a billiard subjected to a central force of the type $V(r)=-α/r-β/r^2$, $α$ and $β$ being positive constants, and with a straight reflection table. In the particular case of $α$ and $β$ positive, we prove the presence of a symbolic dynamics, and hence of positive topological entropy, at positive energy and for $β$ sufficiently small.