Year: 2026
Type: preprint
Abstract: The Fushchych--Shtelen (FS) construction of approximate symmetries, based on a triangular system for the coefficients of a solution expansion, is extended to arbitrary order. A coefficient-map formulation establishes, under explicit hypotheses, a correspondence with the Baikov--Gazizov--Ibragimov (BGI) method. The two approaches are compared for a perturbed cubic wave equation. Nonlinearities admitting an FS point symmetry with prescribed projection onto the unperturbed dilation are classified through second order, up to equivalences. They comprise a power family and logarithmic families at exceptional exponents. Nonlinearities admitting second-order BGI point symmetries that continue this dilation are also classified. Among perturbations nontrivial at first order, these form a proper subfamily of one FS family; another family is admitted by both methods when the perturbation first enters at second order. Joint reduction by the Lorentz algebra and the inherited FS dilation yields explicit invariant solutions for all FS normal forms and recovers the first-order solutions of Fushchych and Shtelen. For the common family with a nontrivial first-order perturbation, the logarithmic corrections arise from expanding a power law with a perturbation-dependent exponent. Periodic traveling waves illustrate the long-scale validity of the FS expansion. The first correction is obtained by quadrature, second-order secular terms are identified, and phase renormalization yields bounded approximations. For integer-power members of the power family, the amplitude dependence of the corrected wavenumber agrees with the symmetry scaling weights.
Source: arXiv (Cornell University)
Author: Shevyakov, Alexey
Institution: University of Saskatchewan
Language: English
Topic: Nonlinear Waves and Solitons
Subfield: Statistical and Nonlinear Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Award: G918023722
OpenAlex ID: W7204955249