English

Metaplectic Categories, Gauging and Property F

Quantum Algebra 2018-08-24 v3

Abstract

NN-Metaplectic categories, unitary modular categories with the same fusion rules as SO(N)2SO(N)_2, are prototypical examples of weakly integral modular categories. As such, a conjecture of the second author would imply that images of the braid group representations associated with metaplectic categories are finite groups, i.e. have property FF. While it was recently shown that SO(N)2SO(N)_2 itself has property FF, proving property FF for the more general class of metaplectic modular categories is an open problem. We verify this conjecture for NN-metaplectic modular categories when NN is odd, exploiting their classification and enumeration to relate them to SO(N)2SO(N)_2. In another direction, we prove that when NN is divisible by 88 the NN-metaplectic categories have 33 non-trivial bosons, and the boson condensation procedure applied to 2 of these bosons yields N4\frac{N}{4}-metaplectic categories. Otherwise stated: any 8k8k-metaplectic category is a Z2\mathbb{Z}_2-gauging of a 2k2k-metaplectic category, so that the NN even metaplectic categories lie towers of Z2\mathbb{Z}_2-gaugings commencing with 2k2k- or 4k4k-metaplectic categories with kk odd.

Keywords

Cite

@article{arxiv.1808.00698,
  title  = {Metaplectic Categories, Gauging and Property F},
  author = {Paul Gustafson and Eric Rowell and Yuze Ruan},
  journal= {arXiv preprint arXiv:1808.00698},
  year   = {2018}
}

Comments

version 3: condensed proofs

R2 v1 2026-06-23T03:22:30.684Z