Mathematical Research Letters

Volume 9 (2002)

Number 1

Commutative conservation laws for geodesic flows of metrics admitting projective symmetry

Pages: 65 – 72



Peter Topalov (Universität Zürich)


We prove that the geodesic flow of a pseudo-Riemannian metric $g$ that admits a “nontrivial” projective symmetry $X$ is completely integrable. Nontriviality condition of the projective symmetry is expressed in the terms of the invariants of the pair forms $g$ and $L_Xg$, where $L_X$ denotes the Lie derivative with respect to the vector field $X$. The theorem we propose can be considered as a “commutative” analog of the Noether theorem.

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