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arxiv: 1812.05109 · v4 · pith:XFPY7O4Dnew · submitted 2018-12-12 · ✦ hep-th · math-ph· math.MP· math.NT

Curiosities above c = 24

classification ✦ hep-th math-phmath.MPmath.NT
keywords charactersmethodnumberrcfttheoriestheretwo-characterabove
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Two-dimensional rational CFT are characterised by an integer $\ell$, related to the number of zeroes of the Wronskian of the characters. For two-character RCFT's with $\ell<6$ there is a finite number of theories and most of these are classified. Recently it has been shown that for $\ell \ge 6$ there are infinitely many admissible characters that could potentially describe CFT's. In this note we examine the $\ell=6$ case, whose central charges lie between 24 and 32, and propose a classification method based on cosets of meromorphic CFT's. We illustrate the method using theories on Kervaire lattices with complete root systems. In the process we construct the first known two-character RCFT's beyond $\ell=2$.

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  1. Signs, growth and admissibility of quasi-characters and the holomorphic modular bootstrap for RCFT

    hep-th 2025-07 unverdicted novelty 6.0

    The work proves that quasi-character coefficients have stabilizing alternating signs and estimates their growth near n ~ c/12 via Frobenius recursion on MLDEs, enabling candidate RCFT characters at arbitrary Wronskian index.