Trigonometric Degeneration and Orbifold Wess-Zumino-Witten Model. I

Abstract

Trigonometric degeneration of the Baxter-Belavin elliptic r matrix is described by the degeneration of the twisted WZW model on elliptic curves. The spaces of conformal blocks and conformal coinvariants of the degenerate model are factorised into those of the orbifold WZW model.Comment: 24 pages, 1 figure, contribution to ``Conformal Field Theory and Integrable Models'', Chernogolovka, Moscow Region, Russia, on September 15--21, 2002; typos corrected, references added (v2); typos corrected, final version (v3