Abstract
We consider modulational solutions to the 3D inviscid incompressible irrotational infinite depth water wave problem, neglecting surface tension. For such solutions, it is well known that one formally expects the modulation to be a profile traveling at group velocity and governed by a 2D hyperbolic cubic nonlinear Schrödinger equation. In this paper we justify this fact by providing rigorous error estimates in Sobolev spaces. We reproduce the multiscale calculation to derive an approximate wave packet-like solution to the evolution equations with mild quadratic nonlinearities constructed by Sijue Wu. Then we use the energy method along with the method of normal forms to provide suitable a priori bounds on the difference between the true and approximate solutions.
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Communicated by N. Totz
The author would like to thank Sijue Wu for her discussions on her formulation of the 3D water wave problem, as well as her helpful comments and suggestions on the draft of this paper. The author was supported in part by NSF grant DMS-0800194.
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Totz, N. A Justification of the Modulation Approximation to the 3D Full Water Wave Problem. Commun. Math. Phys. 335, 369–443 (2015). https://doi.org/10.1007/s00220-014-2259-7
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DOI: https://doi.org/10.1007/s00220-014-2259-7