Full field algebras, operads and tensor categories

Liang Kong

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Submission date: 15. Mar. 2006
Pages: 82
published in: Advances in mathematics, 213 (2007) 1, p. 271-340 
DOI number (of the published article): 10.1016/j.aim.2006.12.007
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Abstract:
We study the operadic and categorical formulations of (conformal) full field algebras. In particular, we show that a grading-restricted R×R-graded full field algebra is equivalent to an algebra over a partial operad constructed from spheres with punctures and local coordinates. This result is general- ized to conformal full field algebras over V^L ⊗ V^R, where V^L and V^R are two vertex operator algebras satisfying certain natural finite and reductive conditions. We also study the geometry interpretation of conformal full field algebras over V^L ⊗ V^R equipped with a nondegenerate invariant bi- linear form. By assuming slightly stronger conditions on V^L and V^R, we show that a conformal full field algebra over V^L ⊗ V^R equipped with a non- degenerate invariant bilinear form exactly corresponds to a commutative Frobenius algebra with a trivial twist in the category of V^L ⊗ V^R-modules. The so-called diagonal constructions [Y.-Z. Huang and L. Kong, Full field algebras, arXiv:math.QA/0511328.] of conformal full field algebras are given in tensor-categorical language.