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Title
Hecke relations among 2d fermionic RCFTs
KIAS Author
Lee, Kimyeong,Sun, Kaiwen
Journal
JOURNAL OF HIGH ENERGY PHYSICS, 2023
Archive
hep-th/2211.15304
Abstract
Recently, Harvey and Wu proposed a suitable Hecke operator for vector-valued SL(2, Z) modular forms to connect the characters of different 2d rational conformal field theories (RCFTs). We generalize such an operator to the 2d fermionic RCFTs and call it fermionic Hecke operator. The new Hecke operator naturally maps the Neveu-Schwarz (NS) characters of a fermionic theory to the NS characters of another fermionic theory. Mathematically, it is the natural Hecke operator on vector-valued Gamma(theta) modular forms of weight zero. We find it can also be extended to (NS) over tilde and Ramond (R) sectors by combining the characters of the two sectors together. We systematically study the fermionic Hecke relations among 2d fermionic RCFTs with up to five NS characters and find that almost all known supersymmetric RCFTs can be realized as fermionic Hecke images of some simple theories such as supersymmetric minimal models. We also study the coset relations between fermionic Hecke images with respect to c = 12k holomorphic SCFTs.