Three approaches towards Floer homology of cotangent bundles

Details Three approaches towards Floer homology of cotangent bundles Three approaches towards Floer homology of cotangent bundles

2006-02-10

arxiv.org/abs/math/0602230v1

Mathematics

Symplectic Geometry

30 pages, 6 figures. To appear in J. Symplectic Geom. (Stare Jablonki conference issue)

Scientific paper

Consider the cotangent bundle of a closed Riemannian manifold and an almost complex structure close to the one induced by the Riemannian metric. For Hamiltonians which grow for instance quadratically in the fibers outside of a compact set, one can define Floer homology and show that it is naturally isomorphic to singular homology of the free loop space. We review the three isomorphisms constructed by Viterbo (1996), Salamon-Weber (2003) and Abbondandolo-Schwarz (2004). The theory is illustrated by calculating Morse and Floer homology in case of the euclidean n-torus. Applications include existence of noncontractible periodic orbits of compactly supported Hamiltonians on open unit disc cotangent bundles which are sufficiently large over the zero section.

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