Virasoro Algebra, Dedekind $η$-function and Specialized Macdonald's Identities

Details Virasoro Algebra, Dedekind $η$-function and Specialized Macdonald's Identities Virasoro Algebra, Dedekind $η$-function and Specialized Macdonald's Identities

2003-11-24

arxiv.org/abs/math/0311405v1

Transform. Groups 9 (2004) 273-288

Mathematics

Quantum Algebra

16 pages, LaTeX

Scientific paper

We motivate and prove a series of identities which form a generalization of the Euler's pentagonal number theorem, and are closely related to specialized Macdonald's identities for powers of the Dedekind $\eta$--function. More precisely, we show that what we call ``denominator formula'' for the Virasoro algebra has ``higher analogue'' for all $c_{s,t}$-minimal models. We obtain one identity per series which is in agreement with features of conformal field theory such as {\em fusion} and {\em modular invariance} that require all the irreducible modules of the series. In particular, in the case of $c_{2,2k+1}$--minimal models we give a new proof of a family of specialized Macdonald's identities associated with twisted affine Lie algebras of type $A^{(2)}_{2k}, k \geq 2$ (i.e., $BC_k$-affine root system) which involve $(2k^2-k)$-th powers of the Dedekind $\eta$-function. Our paper is in many ways a continuation of math.QA/0309201.

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