Painleve equations from Darboux chains - Part 1: P3-P5

Details Painleve equations from Darboux chains - Part 1: P3-P5 Painleve equations from Darboux chains - Part 1: P3-P5

2003-02-06

arxiv.org/abs/nlin/0302012v2

Nonlinear Sciences

Exactly Solvable and Integrable Systems

23 pages, 1 reference added + minor changes

Scientific paper

10.1088/0305-4470/36/42/014

We show that the Painleve equations P3-P5 can be derived (in a unified way) from a periodic sequence of Darboux transformations for a Schrodinger problem with quadratic eigenvalue dependency. The general problem naturally divides into three different branches, each described by an infinite chain of equations. The Painleve equations are obtained by closing the chain periodically at the lowest nontrivial level(s). The chains provide ``symmetric forms'' for the Painleve equations, from which Hirota bilinear forms and Lax pairs are derived. In this paper (Part 1) we analyze in detail the cases P3-P5, while P6 will be studied in Part 2.

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