paper

Tau functions in combinatorial Bethe ansatz

arXiv:math/0610505 · doi:10.1016/j.nuclphysb.2007.06.007

Abstract

We introduce ultradiscrete tau functions associated with rigged configurations for A^{(1)}_n. They satisfy an ultradiscrete version of the Hirota bilinear equation and play a role analogous to a corner transfer matrix for the box-ball system. As an application, we establish a piecewise linear formula for the Kerov-Kirillov-Reshetikhin bijection in the combinatorial Bethe ansatz. They also lead to general N-soliton solutions of the box-ball system.

52 pages

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