Simplifications of Lax pairs for differential-difference equations by gauge transformations and (doubly) modified integrable equations
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arXiv
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| Natura: | Preprint |
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2024
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| _version_ | 1866911970316255232 |
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| author | Igonin, Sergei |
| author_facet | Igonin, Sergei |
| contents | Matrix differential-difference Lax pairs play an essential role in the theory of integrable nonlinear differential-difference equations. We present sufficient conditions which allow one to simplify such a Lax pair by matrix gauge transformations. Furthermore, we describe a procedure for such a simplification and present applications of it to constructing new integrable equations connected by (non-invertible) discrete substitutions of Miura type to known equations with Lax pairs.
Suppose that one has three (possibly multicomponent) equations $E$, $E_1$, $E_2$, a (Miura-type) discrete substitution from $E_1$ to $E$, and a discrete substitution from $E_2$ to $E_1$. Then $E_1$ and $E_2$ can be called a modified version of $E$ and a doubly modified version of $E$, respectively. We demonstrate how the above-mentioned procedure helps (in the considered examples) to construct modified and doubly modified versions of a given equation possessing a Lax pair satisfying certain conditions.
The considered examples include scalar equations of Itoh-Narita-Bogoyavlensky type and $2$-component equations related to the Toda lattice. We present several new integrable equations connected by new discrete substitutions of Miura type to known equations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_12022 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Simplifications of Lax pairs for differential-difference equations by gauge transformations and (doubly) modified integrable equations Igonin, Sergei Exactly Solvable and Integrable Systems Mathematical Physics Dynamical Systems 37K60, 37K35 Matrix differential-difference Lax pairs play an essential role in the theory of integrable nonlinear differential-difference equations. We present sufficient conditions which allow one to simplify such a Lax pair by matrix gauge transformations. Furthermore, we describe a procedure for such a simplification and present applications of it to constructing new integrable equations connected by (non-invertible) discrete substitutions of Miura type to known equations with Lax pairs. Suppose that one has three (possibly multicomponent) equations $E$, $E_1$, $E_2$, a (Miura-type) discrete substitution from $E_1$ to $E$, and a discrete substitution from $E_2$ to $E_1$. Then $E_1$ and $E_2$ can be called a modified version of $E$ and a doubly modified version of $E$, respectively. We demonstrate how the above-mentioned procedure helps (in the considered examples) to construct modified and doubly modified versions of a given equation possessing a Lax pair satisfying certain conditions. The considered examples include scalar equations of Itoh-Narita-Bogoyavlensky type and $2$-component equations related to the Toda lattice. We present several new integrable equations connected by new discrete substitutions of Miura type to known equations. |
| title | Simplifications of Lax pairs for differential-difference equations by gauge transformations and (doubly) modified integrable equations |
| topic | Exactly Solvable and Integrable Systems Mathematical Physics Dynamical Systems 37K60, 37K35 |
| url | https://arxiv.org/abs/2403.12022 |