Geodesic Conjugacy in two-step nilmanifolds

Details Geodesic Conjugacy in two-step nilmanifolds Geodesic Conjugacy in two-step nilmanifolds

1995-03-15

arxiv.org/abs/math/9503220v1

Mathematics

Differential Geometry

Scientific paper

Two Riemannian manifolds are said to have $C^k$-conjugate geodesic flows if there exist an $C^k$ diffeomorphism between their unit tangent bundles which intertwines the geodesic flows. We obtain a number of rigidity results for the geodesic flows on compact 2-step Riemannian nilmanifolds: For generic 2-step nilmanifolds the geodesic flow is $C^2$ rigid. For special classes of 2-step nilmanifolds, we show that the geodesic flow is $C^0$ or $C^2$ rigid. In particular, there exist continuous families of 2-step nilmanifolds whose Laplacians are isospectral but whose geodesic flows are not $C^0$ conjugate.

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