Moonshine-like function characterization conjecture

Let ff be a moonshine-like function, meaning a completely replicable function given by the graded trace of a finite-order automorphism of a C2C_2-cofinite, holomorphic vertex operator algebra of central charge 2424 with graded dimension J(τ)=j(τ)744=q1+196884q+J(\tau)=j(\tau)-744=q^{-1}+196884q+\cdots. Moonshine-like function characterization conjecture. There is some gMg\in\mathbb{M} such that

f=Tg.f=T_g.

This conjecture would characterize all trace functions arising from moonshine-like vertex operator algebras as monstrous McKay–Thompson series. The paper proves strong restrictions and shows that all non-monstrous functions except possibly 9a9a, 63a63a, and 117a117a are non-moonshine-like, leaving only a small unresolved part.

Sources & referencesView supporting material

Primary source

Scott Carnahan, Takahiro Komuro and Satoru Urano, “Characterizing Moonshine Functions by Vertex-Operator-Algebraic Conditions”, arXiv:1712.10160 (2018).

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