Modular invariance for conformal full field algebras

Details Modular invariance for conformal full field algebras Modular invariance for conformal full field algebras

2006-09-20

arxiv.org/abs/math/0609570v2

Mathematics

Quantum Algebra

54 pages

Scientific paper

Let V^L and V^R be simple vertex operator algebras satisfying certain natural uniqueness-of-vacuum, complete reducibility and cofiniteness conditions and let F be a conformal full field algebra over the tensor product of V^L and V^R. We prove that the q_\tau-\bar{q_\tau}-traces (natural traces involving q_\tau=e^{2\pi i\tau} and \bar{q_\tau}=\bar{e^{2\pi i\tau}}) of geometrically modified genus-zero correlation functions for F are convergent in suitable regions and can be extended to doubly periodic functions with periods 1 and \tau. We obtain necessary and sufficient conditions for these functions to be modular invariant. In the case that V^L=V^R and F is one of those constructed by the authors in \cite{HK}, we prove that all these functions are modular invariant.

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