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A rapidity-independent parameter in the star-triangle relation

R. J. Baxter
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Abstract

The normalization factor in the star-triangle relation can be evaluated in a simple form by taking determinants. If we combine this with the rotation symmetries, then we can show that a certain simple quantity $I$ has to be independent of the rapidities. In this sense it is an invariant. We evaluate it for several particular models and find it is one for self-dual models, and is related to the modulus $k$ (or $k'$) for the Ising, Kashiwara-Miwa and chiral Potts models.

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R. J. Baxter. 2001-08-23. A rapidity-independent parameter in the star-triangle relation. https://arxiv.org/abs/cond-mat/0108363

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