Studies on the second member of the second Painlevé hierarchy

Details Studies on the second member of the second Painlevé hierarchy Studies on the second member of the second Painlevé hierarchy

2008-05-16

arxiv.org/abs/0805.2444v2

Mathematics

Algebraic Geometry

21 pages

Scientific paper

In this paper, we study the second member of the second Painlev\'e hierarchy $P_{II}^{(2)}$. We show that the birational transformations take this equation to the polynomial Hamiltonian system in dimension four, and this Hamiltonian system can be considered as a 1-parameter family of coupled Painlev\'e systems. This Hamiltonian is new. We also show that this system admits extended affine Weyl group symmetry of type $A_1^{(1)}$, and can be recovered by its holomorphy conditions. We also study a fifth-order ordinary differential equation satisfied by this Hamiltonian. After we transform this equation into a system of the first-order ordinary differential equations of polynomial type in dimension five by birational transformations, we give its symmetry and holomorphy conditions.

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