FUSION RULES FOR EXTENDED CURRENT ALGEBRAS
Ernest Baver, Doron Gepner · Modern Physics Letters A · 1996
The initial classification of fusion rules have shown that rational conformal field theory is very limited. In this letter we study the fusion rules of extended current algebras. Explicit formulas are given for the S-matrix and the fusion rules, based on the full splitting of the fixed point fields. We find that in some cases sensible fusion rules are obtained, while in others this procedure leads to fractional fusion constants.