The Lattice Structure of Connection Preserving Deformations for q-Painlev\'e Equations I

TL;DR

This paper investigates the lattice structure of connection preserving deformations related to q-Painlevé equations, linking their symmetries, Bäcklund transformations, and Lax pairs within a unified algebraic framework.

Contribution

It reveals that translational Bäcklund transformations of q-Painlevé equations can be lifted to their linear problems, establishing a lattice structure for connection preserving deformations.

Findings

Connection preserving deformations form a lattice structure.

Translational Bäcklund transformations admit Lax pairs.

Framework applies to q-Painlevé equations up to q-PVI.

Abstract

We wish to explore a link between the Lax integrability of the $q$-Painlev\'e equations and the symmetries of the $q$-Painlev\'e equations. We shall demonstrate that the connection preserving deformations that give rise to the $q$-Painlev\'e equations may be thought of as elements of the groups of Schlesinger transformations of their associated linear problems. These groups admit a very natural lattice structure. Each Schlesinger transformation induces a B\"acklund transformation of the $q$-Painlev\'e equation. Each translational B\"acklund transformation may be lifted to the level of the associated linear problem, effectively showing that each translational B\"acklund transformation admits a Lax pair. We will demonstrate this framework for the $q$-Painlev\'e equations up to and including $q$-$\mathrm{P}_{\mathrm{VI}}$.