A variational perspective on continuum limits of ABS and lattice GD equations
Abstract
A pluri-Lagrangian structure is an attribute of integrability for lattice equations and for hierarchies of differential equations. It combines the notion of multi-dimensional consistency (in the discrete case) or commutativity of the flows (in the continuous case) with a variational principle. Recently we developed a continuum limit procedure for pluri-Lagrangian systems, which we now apply to most of the ABS list and some members of the lattice Gelfand-Dickey hierarchy. We obtain pluri-Lagrangian structures for many hierarchies of integrable PDEs for which such structures where previously unknown. This includes the Krichever-Novikov hierarchy, the double hierarchy of sine-Gordon and modified KdV equations, and a first example of a continuous multi-component pluri-Lagrangian system.
Keywords
Cite
@article{arxiv.1811.01855,
title = {A variational perspective on continuum limits of ABS and lattice GD equations},
author = {Mats Vermeeren},
journal= {arXiv preprint arXiv:1811.01855},
year = {2019}
}