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We prove that the geodesic flow on a compact locally CAT(−1) space has the weak specification property, and give various applications. We show that every Hölder potential on the space of geodesics has a unique equilibrium state. We establish the equidistribution of weighted periodic orbits and the large deviations principle for all such measures. The thermodynamic results are proved for the class of expansive flows with weak specification.
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David Constantine, Jean-François Lafont, Daniel J. Thompson, The weak specification property for geodesic flows on CAT(–1) spaces. Groups Geom. Dyn. 14 (2020), no. 1, pp. 297–336