Poisson Pencils, Lie Symmetries and Hamiltonian Reductions of a Coupled Nonlinear Wave System:Tangent KdV Geometry and Elliptic Moduli
Abstract
We study the two-field nonlinear dispersive system ut=uxxx+6uux, vt=vxxx+6(uv)x, viewed simultaneously as a coupled wave equation, as the tangent covering of Korteweg--de Vries (KdV), and as a Hamiltonian flow on a tangent Poisson manifold. The main purpose is to make these viewpoints interact at theorem level. First, we prove that the Magri Poisson pencil of KdV admits a complete tangent lift to an explicit compatible pair of matrix Hamiltonian operators. The corresponding recursion operator has triangular tangent form and generates the lifted KdV hierarchy. Second, we identify a five-dimensional point-symmetry algebra together with the infinite hierarchy of tangent generalized symmetries. Third, reduction by the traveling-wave subgroup produces a four-dimensional Hamiltonian system that is the complete tangent lift of the scalar KdV profile dynamics. On the nonsingular elliptic locus, the base profile is written in Weierstrass form and every tangent traveling wave is classified explicitly by derivatives with respect to the energy and integration constants.
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BibTeX
@misc{salas2026poisson,
title = {{Poisson Pencils, Lie Symmetries and Hamiltonian Reductions of a Coupled Nonlinear Wave System:Tangent KdV Geometry and Elliptic Moduli}},
author = {Alvaro H. Salas},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.13300},
eprint = {2609.13300},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.13300},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Poisson Pencils, Lie Symmetries and Hamiltonian Reductions of a Coupled Nonlinear Wave System:Tangent KdV Geometry and Elliptic Moduli
AU - Alvaro H. Salas
PY - 2026
DA - 2026/09/10
PB - arXiv
DO - 10.48550/arxiv.2609.13300
UR - https://arxiv.org/abs/2609.13300
AB - We study the two-field nonlinear dispersive system u_t=u_xxx+6uu_x, v_t=v_xxx+6(uv)_x, viewed simultaneously as a coupled wave equation, as the tangent covering of Korteweg--de Vries (KdV), and as a Hamiltonian flow on a tangent Poisson manifold. The main purpose is to make these viewpoints interact at theorem level. First, we prove that the Magri Poisson pencil of KdV admits a complete tangent lift to an explicit compatible pair of matrix Hamiltonian operators. The corresponding recursion operator has triangular tangent form and generates the lifted KdV hierarchy. Second, we identify a five-dimensional point-symmetry algebra together with the infinite hierarchy of tangent generalized symmetries. Third, reduction by the traveling-wave subgroup produces a four-dimensional Hamiltonian system that is the complete tangent lift of the scalar KdV profile dynamics. On the nonsingular elliptic locus, the base profile is written in Weierstrass form and every tangent traveling wave is classified explicitly by derivatives with respect to the energy and integration constants.
ER -