Rational Generalised Moonshine from Abelian Orbifoldings of the Moonshine Module

Details Rational Generalised Moonshine from Abelian Orbifoldings of the Moonshine Module Rational Generalised Moonshine from Abelian Orbifoldings of the Moonshine Module

2001-06-05

arxiv.org/abs/math/0106027v2

Nucl.Phys. B635 (2002) 435-472

Mathematics

Quantum Algebra

40 pages, Improved version

Scientific paper

We consider orbifoldings of the Moonshine Module with respect to the abelian group generated by a pair of commuting Monster group elements with one of prime order $p=2,3,5,7$ and the other of order $pk$ for $k=1$ or $k$ prime. We show that constraints arising from meromorphic orbifold conformal field theory allow us to demonstrate that each orbifold partition function with rational coefficients is either constant or is a hauptmodul for an explicitly found modular fixing group of genus zero. We thus confirm in the cases considered the Generalised Moonshine conjectures for all rational modular functions for the Monster centralisers related to the Baby Monster, Fischer, Harada-Norton and Held sporadic simple groups. We also derive non-trivial constraints on the possible Monster conjugacy classes to which the elements of the orbifolding abelian group may belong.

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