Constraints on exact Lagrangians in cotangent bundles of manifolds fibred over the circle

Details Constraints on exact Lagrangians in cotangent bundles of manifolds fibred over the circle Constraints on exact Lagrangians in cotangent bundles of manifolds fibred over the circle

2007-10-02

arxiv.org/abs/0710.0511v2

Mathematics

Symplectic Geometry

Scientific paper

We give topological obstructions to the existence of a closed exact Lagrangian submanifold in the cotangent bundle of a closed manifold M which is the total space of a fibration over the circle. For instance we show that the fundamental group of such a Lagrangian submanifold cannot be the free product of two non-trivial groups and that in any finite presentation of this group the difference between the number of generators and the number of relations is less than two.

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