A collective coordinate framework to study solitary waves in stochastically perturbed Korteweg-de Vries equations
Abstract
Stochastically perturbed Korteweg-de Vries (KdV) equations are widely used to describe the effect of random perturbations on coherent solitary waves. We present a collective coordinate approach to describe the effect on coherent solitary waves in stochastically perturbed KdV equations. The collective coordinate approach allows one to reduce the infinite-dimensional stochastic partial differential equation (SPDE) to a finite-dimensional stochastic differential equation for the amplitude, width and location of the solitary wave. The reduction provides a remarkably good quantitative description of the shape of the solitary waves and its location. Moreover, the collective coordinate framework can be used to estimate the time-scale of validity of stochastically perturbed KdV equations for which they can be used to describe coherent solitary waves. We describe loss of coherence by blow-up as well as by radiation into linear waves. We corroborate our analytical results with numerical simulations of the full SPDE.
Keywords
Cite
@article{arxiv.2104.04619,
title = {A collective coordinate framework to study solitary waves in stochastically perturbed Korteweg-de Vries equations},
author = {Madeleine Cartwright and Georg A. Gottwald},
journal= {arXiv preprint arXiv:2104.04619},
year = {2021}
}