Introduction to Vertex Algebras, Borcherds Algebras, and the Monster Lie Algebra

Details Introduction to Vertex Algebras, Borcherds Algebras, and the Monster Lie Algebra Introduction to Vertex Algebras, Borcherds Algebras, and the Monster Lie Algebra

1993-08-31

arxiv.org/abs/hep-th/9308151v2

Int.J.Mod.Phys.A8:5441-5504,1993

Physics

High Energy Physics

High Energy Physics - Theory

55 pages, (two minor changes thanks to comment by R. Borcherds)

Scientific paper

10.1142/S0217751X93002162

The theory of vertex algebras constitutes a mathematically rigorous axiomatic formulation of the algebraic origins of conformal field theory. In this context Borcherds algebras arise as certain ``physical'' subspaces of vertex algebras. The aim of this review is to give a pedagogical introduction into this rapidly-developing area of mathemat% ics. Based on the machinery of formal calculus we present the axiomatic definition of vertex algebras. We discuss the connection with conformal field theory by deriving important implications of these axioms. In particular, many explicit calculations are presented to stress the eminent role of the Jacobi identity axiom for vertex algebras. As a class of concrete examples the vertex algebras associated with even lattices are constructed and it is shown in detail how affine Lie algebras and the fake Monster Lie algebra naturally appear. This leads us to the abstract definition of Borcherds algebras as generalized Kac-Moody algebras and their basic properties. Finally, the results about the simplest generic Borcherds algebras are analysed from the point of view of symmetry in quantum theory and the construction of the Monster Lie algebra is sketched.

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