An Index Theory for Paths That Are Solutions of a Class of Strongly Indefinite Variational Problems
نویسنده
چکیده
We generalize the Morse index theorem of [12, 13] and we apply the new result to obtain lower estimates on the number of geodesics joining two fixed non conjugate points in certain classes of semi-Riemannian manifolds. More specifically, we consider semi-Riemannian manifolds (M, g) admitting a smooth distribution spanned by commuting Killing vector fields and containing a maximal negative distribution for g. In particular we obtain Morse relations for stationary semi-Riemannian manifolds (see [7]) and for the Gödel-type manifolds (see [3]).
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