Strictly non-proportional geodesically equivalent metrics have
arXiv:math/0410498
Abstract
Suppose the Riemannian metrics and on a closed connected manifold are geodesically equivalent and strictly non-proportional at least at one point. Then the topological entropy of the geodesic flow of vanishes.
arXiv commentThis is a slightly extended version of the paper submitted to ETDS. 16 pages, one .eps figure