Holomorphic quasi-modular bootstrap

Holomorphic modular bootstrap is an approach to classifying rational conformal field theories making use of the modular differential equations. In this paper we explore its flavored refinement. For a class of chiral algebras, we propose constraints on a special null state, which determine the structure of the algebra, and through flavored modular differential equations and quasi-modularity, completely fix the spectra in both the untwisted and twisted sector. Using the differential equations, we reveal hidden structures among null states of the chiral algebras under the modular group action and translation related to spectral flow.