On the wave turbulence theory of 2D gravity waves, I: deterministic energy estimates

TL;DR

This paper initiates a rigorous study of wave turbulence for 2D gravity water waves, focusing on energy estimates and addressing the challenges posed by quasilinear equations unlike semilinear models.

Contribution

It introduces a novel strategy to derive energy estimates for 2D gravity water waves, overcoming derivative loss issues in quasilinear equations, paving the way for wave kinetic equation derivation.

Findings

Developed a new approach for energy estimates in quasilinear water wave models

Addressed derivative loss challenges in 2D gravity wave equations

Laid groundwork for rigorous wave turbulence analysis in water waves

Abstract

Our goal in this paper is to initiate the rigorous investigation of wave turbulence and derivation of wave kinetic equations (WKE) for water waves models. This problem has received intense attention in recent years in the context of semilinear models, such as semilinear Schr\"odinger equations or multi-dimensional KdV-type equations. However, our situation here is different since the water waves equations are quasilinear and the solutions cannot be constructed by iteration of the Duhamel formula due to unavoidable derivative loss. This is the first of two papers in which we design a new strategy to address this issue, in the context of 2D gravity waves.