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arXiv · 1908.03165

Time-periodic solutions of Hamiltonian PDEs using pseudoholomorphic curves

Oliver Fabert·Niek Lamoree
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Abstract

We extend the pseudoholomorphic curve methods from Floer theory to infinite-dimensional phase spaces and use our results to prove the existence of a forced time-periodic solution to a general Hamiltonian PDE with regularizing nonlinearity. In particular, when the nonlinearity is sufficiently regularizing, bounded and time-periodic, we prove an infinite-dimensional version of Gromov-Floer compactness by using ideas from the theory of Diophantine approximations to overcome the small divisor problem. Furthermore, in the case when the infinite-dimensional phase space is a product of a finite-dimensional closed symplectic manifold with linear symplectic Hilbert space, we prove a cup-length estimate for the number of periodic solutions.

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Oliver Fabert, Niek Lamoree. 2019-08-08. Time-periodic solutions of Hamiltonian PDEs using pseudoholomorphic curves. https://doi.org/10.2140/agt.2023.23.461

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