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arXiv · 1610.09631

Lagrangian isotopies and symplectic function theory

Michael Entov·Yaniv Ganor·Cedric Membrez
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Abstract

We study two related invariants of Lagrangian submanifolds in symplectic manifolds. For a Lagrangian torus these invariants are functions on the first cohomology of the torus. The first invariant is of topological nature and is related to the study of Lagrangian isotopies with a given Lagrangian flux. More specifically, it measures the length of straight paths in the first cohomology that can be realized as the Lagrangian flux of a Lagrangian isotopy. The second invariant is of analytical nature and comes from symplectic function theory. It is defined for Lagrangian submanifolds admitting fibrations over a circle and has a dynamical interpretation. We partially compute these invariants for certain Lagrangian tori.

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Michael Entov, Yaniv Ganor, Cedric Membrez. 2016-10-30. Lagrangian isotopies and symplectic function theory. https://arxiv.org/abs/1610.09631

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