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BIMSA-Tsinghua String Seminar
2d CFTs, Borcherds products and hyperbolization of affine Lie algebras
2d CFTs, Borcherds products and hyperbolization of affine Lie algebras
Organizers
Speaker
Kai-Wen Sun
Time
Monday, January 15, 2024 2:00 PM - 3:00 PM
Venue
A3-3-301
Online
Zoom 518 868 7656
(BIMSA)
Abstract
In 1983, Feingold and Frenkel posed a question about possible relations between affine Lie algebras, hyperbolic Kac-Moody algebras and Siegel modular forms. We give an automorphic answer to this question and its generalization. We classify Borcherds-Kac-Moody algebras whose denominators define reflective automorphic products of singular weight. As a consequence, we prove that there are exactly 81 affine Lie algebras which have nice extensions to BKM algebras. We find that 69 of them appear in Schellekens’ list of holomorphic CFT of central charge 24, while 8 of them correspond to the N=1 structures of holomorphic SCFT of central charge 12 composed of 24 chiral fermions. The last 4 cases are related to exceptional modular invariants from nontrivial automorphisms of fusion algebras. This is based on a joint paper with Haowu Wang and Brandon Williams.