Abstract
An U q (sl( n))-invariant transfer matrix with periodic boundary conditions is analysed by means of the algebraic nested Bethe ansatz for the case of q being a root of unity. The transfer matrix corresponds to a two-dimensional vertex model on a torus with topological interaction with respect to the three-dimensional interior of the torus. By means of finite-size analysis we find the central charge of the corresponding Virasoro algebra as c = (n − 1) [ 1 − n(n + 1) (r(r − 1)) ] .
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