Realization of several related $(2+1)$-dimensional integrable systems via an anti-self-dual Yang--Mills reduction
Year: 2026
Type: preprint
Abstract: We derive several integrable equations in $(2+1)$ dimensions from the anti-self-dual Yang--Mills (ASDYM) equations with gauge group $G=\mathrm{GL}(2,\mathbb C)$ by imposing a single one-dimensional constraint on the ASDYM matrices. The resulting systems include the $(2+1)$-dimensional nonlinear Schrödinger (NLS) equation, a $(2+1)$-dimensional generalized derivative NLS family encompassing the Gerdjikov--Ivanov, Chen--Lee--Liu, and Kaup--Newell equations, and the $(2+1)$-dimensional Heisenberg ferromagnetic (HF) equation. The $(1+1)$-dimensional Wadati--Konno--Ichikawa equation is also recovered through a reciprocal transformation of the HF equation. The nonlinear variables and the associated gauge transformations are expressed explicitly in terms of the entries of the ASDYM matrices. The same one-dimensional constraint is implemented in the Cauchy matrix framework, yielding explicit solutions of the reduced integrable equations. In this formulation, the ASD Yang--Mills Lagrangian density is expressed in terms of a $τ$-function; for suitable exponential data, this $τ$-function becomes a Grammian-type $τ$-function of the Kadomtsev--Petviashvili equaton. The studies are extended to $\mathrm{GL}(M,\mathbb C)$ at the matrix level.
Source: arXiv (Cornell University)
Language: English
Topic: Nonlinear Waves and Solitons
Subfield: Statistical and Nonlinear Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222967736