Iteration of closed geodesics in stationary Lorentzian manifolds

Details Iteration of closed geodesics in stationary Lorentzian manifolds Iteration of closed geodesics in stationary Lorentzian manifolds

2007-05-04

arxiv.org/abs/0705.0589v2

Mathematics

Differential Geometry

LaTeX2e, amsart, 22 pages. Acknowledgements of financial support added

Scientific paper

Following the lines of a celebrated result by R. Bott (Comm. Pure Appl. Math. 9, 1956) we study the Morse index of the iterated of a closed geodesic in stationary Lorentzian manifolds, or, more generally, of a closed Lorentzian geodesic that admits a timelike periodic Jacobi field. Given one such closed geodesic $\gamma$, we prove the existence of a locally constant integer valued map $\Lambda_\gamma$ on the unit circle with the property that the Morse index of the iterated $\gamma^N$ is equal, up to a correction term $\epsilon_\gamma\in\{0,1\}$, to the sum of the values of $\Lambda_\gamma$ at the $N$-th roots of unity. The discontinuities of $\Lambda_\gamma$ occur at a finite number of points of the unit circle, that are special eigenvalues of the linearized Poincar\'e map of $\gamma$. We discuss some applications of the theory.

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