## View abstract

### Session S22 - Deterministic and probabilistic aspects of nonlinear evolution equations

Thursday, July 22, 18:20 ~ 18:50 UTC-3

## The quartic integrability and long time existence of steep water waves in 2d

### Sijue Wu

#### University of Michigan, Ann Arbor, USA   -   This email address is being protected from spambots. You need JavaScript enabled to view it. document.getElementById('cloake4acd0eddf3cdb2d9feeb71d6c15d299').innerHTML = ''; var prefix = '&#109;a' + 'i&#108;' + '&#116;o'; var path = 'hr' + 'ef' + '='; var addye4acd0eddf3cdb2d9feeb71d6c15d299 = 's&#105;j&#117;&#101;' + '&#64;'; addye4acd0eddf3cdb2d9feeb71d6c15d299 = addye4acd0eddf3cdb2d9feeb71d6c15d299 + '&#117;m&#105;ch' + '&#46;' + '&#101;d&#117;'; var addy_texte4acd0eddf3cdb2d9feeb71d6c15d299 = 's&#105;j&#117;&#101;' + '&#64;' + '&#117;m&#105;ch' + '&#46;' + '&#101;d&#117;';document.getElementById('cloake4acd0eddf3cdb2d9feeb71d6c15d299').innerHTML += '<a ' + path + '\'' + prefix + ':' + addye4acd0eddf3cdb2d9feeb71d6c15d299 + '\'>'+addy_texte4acd0eddf3cdb2d9feeb71d6c15d299+'<\/a>';

It is known since the work of Dyachenko & Zakharov in 1994 that for the weakly nonlinear 2d infinite depth water waves, there are no 3-wave interactions and all of the 4-wave interaction coefficients vanish on the non-trivial resonant manifold. In this talk I will present a recent result that proves this partial integrability from a different angle. We construct a sequence of energy functionals $\mathcal E_j(t)$, directly in the physical space, which are explicit in the Riemann mapping variable and involve material derivatives of order $j$ of the solutions for the 2d water wave equation, so that $\frac d{dt} \mathcal E_j(t)$ is quintic or higher order. We show that if some scaling invariant norm, and a norm involving one spacial derivative above the scaling of the initial data are of size no more than $\varepsilon$, then the lifespan of the solution for the 2d water wave equation is at least of order $O(\epsilon^{-3}\ )$, and the solution remains as regular as the initial data during this time. If only the scaling invariant norm of the data is of size $\epsilon$, then the lifespan of the solution is at least of order $O( \epsilon^{-5/2}\ )$. Our long time existence results do not impose size restrictions on the slope of the initial interface and the magnitude of the initial velocity, they allow the interface to have arbitrary large steepnesses and initial velocities to have arbitrary large magnitudes.