Scaling Symmetries and Conservation Laws for Variable-coefficients Nonlinear Dispersive Equations

Érica M. Silva, Wescley L. Souza

Abstract


Scaling symmetries arise in different branches of physics, and symmetry-based approaches are powerful tools for studying scaling-invariant models since they can provide conservation laws that are not obvious by inspection. In this framework, the class of variable-coefficients nonlinear dispersive equations vc$K(m,n)$, which contains several important evolution equations modeling nonlinear phenomena, is considered. For some of its scaling-invariant subclasses, we study its nonlinear self-adjointness and construct eight new local conservation laws associated with scaling symmetries by using a general theorem on conservation laws and the multipliers method. The property of scale invariance of those equations led to five conservation laws with a direct physical interpretation: energy, center of mass, and mass are the conserved quantities obtained in some cases.

 


Keywords


Scaling symmetries; Variable-coefficients nonlinear dispersive equations; Nonlinear self-adjointness; Conservation laws

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DOI: https://doi.org/10.5540/tema.2019.020.03.429

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TEMA - Trends in Applied and Computational Mathematics

A publication of the Brazilian Society of Applied and Computational Mathematics (SBMAC)
ISSN: 1677-1966  (print version),  2179-8451  (online version)

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