Persistence properties of a Camassa-Holm type equation with $(n+1)-$order non-linearities

TL;DR

This paper investigates the conservation laws, symmetries, and long-term behavior of solutions for a generalized Camassa-Holm type equation with higher-order nonlinearities, including persistence, asymptotic decay, and unique continuation properties.

Contribution

It introduces new conservation laws and symmetry analysis for a family of hyperbolic equations extending the Camassa-Holm model, and studies the persistence and asymptotic behavior of their solutions.

Findings

Two conservation laws with zeroth order characteristics identified.

Solutions with exponentially decaying initial data maintain this decay over time.

Under certain conditions, solutions with specific asymptotic behavior vanish identically.

Abstract

Lower order conservation laws and symmetries of a family of hyperbolic equations having the Camassa-Holm equation as a particular member are obtained. We show that the equation has two conservation laws with zeroth order characteristics and that its symmetries are generated by translations in the independent variables and a certain scaling, as well as some invariant solutions are studied. Next, we consider persistence and asymptotic properties for the solutions of the equation considered. In particular, we analyse the behaviour of the solutions of the equation for large values of the spatial variable. We show that if the initial data has a certain asymptotic exponential decaying, then such property persists for any time as long as the solution exists. Moreover, depending on the behaviour of the initial data for large values of the spatial variable and if for some further time the solution shares the same behaviour, then it necessarily vanishes identically. Finally, we prove unique continuation results for the solutions of the equation.