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A natural construction of Borcherds' Fake Baby Monster Lie Algebra

Gerald Hoehn, Nils R. Scheithauer

math.QAarXiv:math/0312106

Abstract

We use a Z2-orbifold of the vertex operator algebra associated to the Niemeier lattice with root lattice A38 and the no-ghost theorem of string theory to construct a generalized Kac-Moody algebra. Borcherds' theory of automorphic products allows us to determine the simple roots and identify the algebra with the fake baby monster Lie algebra.

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