Paralinearization of the Dirichlet to Neumann operator, and regularity of three-dimensional water waves

Details Paralinearization of the Dirichlet to Neumann operator, and regularity of three-dimensional water waves Paralinearization of the Dirichlet to Neumann operator, and regularity of three-dimensional water waves

2009-01-19

arxiv.org/abs/0901.2888v2

Communications in Partial Differential Equations 34, 12 (2009) 1632-1704

Mathematics

Analysis of PDEs

Corrected version

Scientific paper

This paper is concerned with a priori $C^\infty$ regularity for three-dimensional doubly periodic travelling gravity waves whose fundamental domain is a symmetric diamond. The existence of such waves was a long standing open problem solved recently by Iooss and Plotnikov. The main difficulty is that, unlike conventional free boundary problems, the reduced boundary system is not elliptic for three-dimensional pure gravity waves, which leads to small divisors problems. Our main result asserts that sufficiently smooth diamond waves which satisfy a diophantine condition are automatically $C^\infty$. In particular, we prove that the solutions defined by Iooss and Plotnikov are $C^\infty$. Two notable technical aspects are that (i) no smallness condition is required and (ii) we obtain an exact paralinearization formula for the Dirichlet to Neumann operator.

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