Fusion Algebras of Fermionic Rational Conformal Field Theories via a Generalized Verlinde Formula

Abstract

We prove a generalization of the Verlinde formula to fermionic rational conformal field theories. The fusion coefficients of the fermionic theory are equal to sums of fusion coefficients of its bosonic projection. In particular, fusion coefficients of the fermionic theory connecting two conjugate Ramond fields with the identity are either one or two. Therefore, one is forced to weaken the axioms of fusion algebras for fermionic theories. We show that in the special case of fermionic W(2,d)-algebras these coefficients are given by the dimensions of the irreducible representations of the horizontal subalgebra on the highest weight. As concrete examples we discuss fusion algebras of rational models of fermionic W(2,d)-algebras including minimal models of the $N=1$ super Virasoro algebra as well as $N=1$ super W-algebras SW(3/2,d).

28 pages (Plain TeX), BONN-HE-93-05

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• A (Dummy's) Guide to Working with Gapped Boundaries via (Fermion) Condensation
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• Path Spaces and W-Fusion in Minimal Models
• Fusion rules for the logarithmic $N=1$ superconformal minimal models I: the Neveu-Schwarz sector
• Fusion rules for the logarithmic $N=1$ superconformal minimal models II: including the Ramond sector
• On SW-minimal models and N=1 supersymmetric Quantum Toda-field theories
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