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Linear Dispersive Decay Estimates for the 3+1 Dimensional Water Wave Equation with Surface Tension

Published online by Cambridge University Press:  20 November 2018

Daniel Spirn
Affiliation:
School of Mathematics, University of Minnesota, Minneapolis, MN 55455, U.S.A. e-mail: spirn@math.umn.edu
J. Douglas Wright
Affiliation:
Department of Mathematics, Drexel University, Philadelphia, PA 19104, U.S.A. e-mail: jdoug@math.drexel.edu
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Abstract

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We consider the linearization of the three-dimensional water waves equation with surface tension about a flat interface. Using oscillatory integral methods, we prove that solutions of this equation demonstrate dispersive decay at the somewhat surprising rate of ${{t}^{-5/6}}$. This rate is due to competition between surface tension and gravitation at $O(1)$ wave numbers and is connected to the fact that, in the presence of surface tension, there is a so-called “slowest wave”. Additionally, we combine our dispersive estimates with ${{L}^{2}}$ type energy bounds to prove a family of Strichartz estimates.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 2012

References

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