Higher-order Approximate Symmetries
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.
Related
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- Higher Integrability, Generalized Symmetries, and Partially Topological Field Theories
- Symmetries and Higher-Form Connections in Derived Differential Geometry
- Magnetic Higher-Form Symmetries as Dual Fundamental ∞-Groupoids
BibTeX
@misc{shevyakov2026higherorder,
title = {{Higher-order Approximate Symmetries}},
author = {Alexey Shevyakov},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.31098},
eprint = {2608.31098},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.31098},
}
RIS
TY - UNPB
TI - Higher-order Approximate Symmetries
AU - Alexey Shevyakov
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2608.31098
UR - https://arxiv.org/abs/2608.31098
AB - 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.
ER -