Integrable vertex models and extended conformal invariance

Transfer matrix eigenvalues are exactly computed for large but finite size for a general class of q-state vertex models (q different states per bond, 2<or=q) from their nested Bethe ansatz equations. The conformal dimensions here obtained vary continuously as functions of the anisotropy parameter and express nicely in terms of the Cartan matrix of the underlying Lie algebra. They indicate the presence of an extended conformal invariance.

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