Dynamics of KdV solitons in the presence of a slowly varying potential

TL;DR

This paper analyzes how KdV solitons evolve under a slowly varying potential, providing explicit parameter trajectories and error estimates without inverse scattering, supported by numerical evidence.

Contribution

It offers a new explicit description of soliton dynamics in perturbed KdV equations with a slowly varying potential, using Lyapunov and virial estimates instead of inverse scattering.

Findings

Explicit soliton parameter trajectories derived

Error estimates of size h^{1/2} established

Results supported by numerical simulations

Abstract

We study the dynamics of solitons as solutions to the perturbed KdV (pKdV) equation $\partial_t u = -\partial_x (\partial_x^2 u + 3u^2-bu)$, where $b(x,t) = b_0(hx,ht)$, $h\ll 1$ is a slowly varying, but not small, potential. We option an explicit description of the trajectory of the soliton parameters of scale and position on the dynamically relevant time scale $\delta h^{-1}\log h^{-1}$, together with an estimate on the error of size $h^{1/2}$. In addition to the Lyapunov analysis commonly applied to these problems, we use a local virial estimate due to Martel-Merle (2005). The results are supported by numerics. The proof does not rely on the inverse scattering machinery and is expected to carry through for the $L^2$ subcritical gKdV-$p$ equation, $1<p<5$. The case of $p=3$, the modified Korteweg-de Vries (mKdV) equation, is structurally simpler and more precise results can be obtained by the method of Holmer-Zworski (2007).