Multi-component generalizations of the {CH} equation: Geometrical Aspects, Peakons and Numerical Examples

TL;DR

This paper introduces a family of multi-component integrable equations generalizing the two-component Camassa-Holm equation, exploring their geometric properties, soliton solutions, and Hamiltonian structures.

Contribution

It extends the CH2 equation to a multi-component family CH(n,k), analyzes their geometric and Hamiltonian structures, and provides numerical examples of soliton behaviors.

Findings

All CH(n,k) members exhibit fluid-like soliton properties.

Explicit Lie-Poisson Hamiltonian structures are derived.

Numerical simulations demonstrate soliton solution behaviors.

Abstract

The Lax pair formulation of the two-component Camassa-Holm equation (CH2) is generalized to produce an integrable multi-component family, CH(n,k), of equations with $n$ components and $1\le |k|\le n$ velocities. All of the members of the CH(n,k) family show fluid-dynamics properties with coherent solitons following particle characteristics. We determine their Lie-Poisson Hamiltonian structures and give numerical examples of their soliton solution behaviour. We concentrate on the CH(2,k) family with one or two velocities, including the CH(2,-1) equation in the Dym position of the CH2 hierarchy. A brief discussion of the CH(3,1) system reveals the underlying graded Lie-algebraic structure of the Hamiltonian formulation for CH(n,k) when $n\ge3$.