Classical-Quantum Correspondence and Functional Relations for Painleve Equations

TL;DR

This paper explores the Classical-Quantum Correspondence related to Painleve equations, showing that specific functional relations and potentials derived from linear problems reproduce the Painleve list, offering an alternative definition.

Contribution

It demonstrates that the Classical-Quantum Correspondence can serve as an alternative framework to define Painleve equations through functional relations and potentials.

Findings

Functional equations for potentials depend on a single function.

The function satisfies the heat equation.

Natural choices reproduce the Painleve list.

Abstract

In the light of the Quantum Painleve-Calogero Correspondence established in our previous papers [1,2], we investigate the inverse problem. We imply that this type of the correspondence (Classical-Quantum Correspondence) holds true and find out what kind of potentials arise from the compatibility conditions of the related linear problems. The latter conditions are written as functional equations for the potentials depending on a choice of a single function - the left-upper element of the Lax connection. The conditions of the Correspondence impose restrictions on this function. In particular, it satisfies the heat equation. It is shown that all natural choices of this function (rational, hyperbolic and elliptic) reproduce exactly the Painleve list of equations. In this sense the Classical-Quantum Correspondence can be regarded as an alternative definition of the Painleve equations.