Integral modular categories of Frobenius-Perron dimension $p{q}^n$

Abstract

Integral modular categories of Frobenius-Perron dimension $p{q}^n$, where $p$ and $q$ are primes, are considered. It is already known that such categories are group-theoretical in the cases of $0\le n\le 4$. In the general case we determine that these categories are either group theoretical or contain a Tannakian subcategory of dimension $q^i$ for $i>1$. We then show that all integral modular categories $\mathcal{C}$ with $\mathrm{FPdim}(\mathcal{C})=p{q}^5$ are group-theoretical, and, if in addition $p<q$, all with $\mathrm{FPdim}(\mathcal{C})=p{q}^6$ or $p{q}^7$ are group-theoretical. In the process we generalize an existing criterion for an integral modular category to be group-theoretical.

15 pages, we rewrite the whole paper