Evans–Gannon's modular-data conjecture for odd-order near-group categories

Let GG be a finite abelian group of odd order, let qq be a quadratic form on GG, and let NG(G,q,b,c)\mathcal{NG}(G,q,b,c) be the corresponding near-group fusion category. Let EjE_j be the simple objects in Theorem. Evans–Gannon's conjecture. There exists a metric group (G,q)(G',q') of order G+4|G|+4 such that the simple objects EjE_j are indexed by gGg\in G and xG\{e}x\in G'\backslash\{e\}, with Eg,x=Eg,x1E_{g,x}=E_{g,x^{-1}} and

θEg,x=g,ge2πiq(x).\theta_{E_{g,x}}=\langle g,g\rangle e^{2\pi i\partial q'(x)}.

Moreover, the modular data are given by the Kronecker product of the Weil representation for (G,q)(G,q) with modular data (S,T)(S',T') for a rank G+3|G|+3 modular category:

Sq,q=SqS,Tq,q=TqT.S^{q,q'}=S^q\otimes S',\qquad T^{q,q'}=T^q\otimes T'.

Here

T=Diag(1,1,g,gq,x,xq)gG,xG.T'=\operatorname{Diag}(1,1,\langle g,g\rangle_q,\langle x,x\rangle_{q'})_{g\in G,\,x\in G'}.

This conjecture predicts a uniform description of the modular data of the centers of odd-order near-group fusion categories by means of metric groups and Weil representations; the supplied text does not indicate whether it has been resolved.

Sources & referencesView supporting material

Primary source

Henry Tucker, “Frobenius-Schur indicators for near-group and Haagerup-Izumi fusion categories”, arXiv:1510.05696 (2017).

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