Combinatorics of Solitons in Noncritical String Theory

Abstract

We study the combinatorics of solitons in $D<2$ (or $c<1$) string theory. The weights in the summation over multi-solitons are shown to be automatically determined if we further require that the partition function with soliton background be a $\tau$ function of the KP hierarchy, in addition to the $W_{1+\infty }$ constraint.

10 pages, LaTeX

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