Rademacher sums, moonshine and gravity

Details Rademacher sums, moonshine and gravity Rademacher sums, moonshine and gravity

2009-07-26

arxiv.org/abs/0907.4529v3

Commun. Number Theory Phys. 5 (2011) no. 4, 1-128

Mathematics

Representation Theory

112 pages; minor editing in v.2, submitted; many improvements in v.3 thanks to comments from referees, final version

Scientific paper

In 1939 Rademacher derived a conditionally convergent series expression for the elliptic modular invariant, and used this expression- the first Rademacher sum - to verify its modular invariance. By generalizing Rademacher's approach we construct bases for the spaces of automorphic integrals of arbitrary even integer weight, for all groups commensurable with the modular group. We use these Rademacher sums to illuminate various aspects of the structure of the spaces of automorphic integrals, including the actions of Hecke operators. We obtain a new characterization of the discrete groups of monstrous moonshine in terms of Rademacher sums, and we develop connections between Rademacher sums and a family of monstrous Lie algebras recently introduced by Carnahan. Our constructions suggest conjectures relating monstrous moonshine to a distinguished family of chiral three dimensional quantum gravities, and relating monstrous Lie algebras and their Verma modules to the second quantization of this family of chiral three dimensional quantum gravities.

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