Evans–Gannon-type near-group modular-data conjecture for arbitrary abelian groups

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Let AA be a finite abelian group, let G=A×AG=A\times A, and let ⟨⟨⋅,⋅⟩⟩\langle\langle\cdot,\cdot\rangle\rangle be a non-degenerate symmetric bicharacter on AA. Define q1(a1,a2)=⟨⟨a1,a2⟩⟩q_1(a_1,a_2)=\langle\langle a_1,a_2\rangle\rangle and let the involution be θ1(a1,a2)=(a2,a1)\theta_1(a_1,a_2)=(a_2,a_1). Near-group modular-data conjecture. The modular data of the Drinfeld center of the near-group category for AA with multiplicity ∣A∣|A| are the modular data constructed from these data, with ∣Γ∣=∣G∣+4∣U∣=∣A∣(∣A∣+4)|\Gamma|=|G|+4|U|=|A|(|A|+4). This generalizes the odd-group Evans–Gannon conjecture; it is known in some examples, but the general realization remains open.

References

Primary source

Pinhas Grossman and Masaki Izumi, “Infinite families of potential modular data related to quadratic categories”, arXiv:1906.07397 (2019).

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