paper

Modular differential equations and null vectors

arXiv:0804.0489 · doi:10.1088/1126-6708/2008/09/079

Abstract

We show that every modular differential equation of a rational conformal field theory comes from a null vector in the vacuum Verma module. We also comment on the implications of this result for the consistency of the extremal self-dual conformal field theories at c=24 k.

28 pages, LaTeX, v2: added appendix containing details of proof; version published in JHEP, v3: corrected typos in appendix

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