Rational Ruijsenaars-Schneider hierarchy and bispectral difference operators

Details Rational Ruijsenaars-Schneider hierarchy and bispectral difference operators Rational Ruijsenaars-Schneider hierarchy and bispectral difference operators

2006-09-05

arxiv.org/abs/math-ph/0609011v2

Phys. D 229 (2007), no. 2, 184--190.

Physics

Mathematical Physics

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Scientific paper

10.1016/j.physd.2007.03.017

We show that a monic polynomial in a discrete variable $n$, with coefficients depending on time variables $t_1, t_2,...$ is a $\tau$-function for the discrete Kadomtsev-Petviashvili hierarchy if and only if the motion of its zeros is governed by a hierarchy of Ruijsenaars-Schneider systems. These $\tau$-functions were considered in [12], where it was proved that they parametrize rank one solutions to a difference-differential version of the bispectral problem.

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