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$\mathbb{Z}_N$ Symmetries, Anomalies, and the Modular Bootstrap

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arxiv 2101.08343 v2 pith:FKEX3234 submitted 2021-01-20 hep-th cond-mat.str-el

classification hep-thcond-mat.str-el
keywords mathbbsymmetrybootstrapconstraintsexistencemodularoperatoranomalies
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abstract

We explore constraints on (1+1)$d$ unitary conformal field theory with an internal $\mathbb{Z}_N$ global symmetry, by bounding the lightest symmetry-preserving scalar primary operator using the modular bootstrap. Among the other constraints we have found, we prove the existence of a $\mathbb{Z}_N$-symmetric relevant/marginal operator if $N-1 \le c\le 9-N$ for $N\leq4$, with the endpoints saturated by various WZW models that can be embedded into $(\mathfrak{e}_8)_1$. Its existence implies that robust gapless fixed points are not possible in this range of $c$ if only a $\mathbb{Z}_N$ symmetry is imposed microscopically. We also obtain stronger, more refined bounds that depend on the 't Hooft anomaly of the $\mathbb{Z}_N$ symmetry.

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