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arXiv · 2302.13466

Higher-group structure in lattice Abelian gauge theory under instanton-sum modification

Naoto Kan·Okuto Morikawa·Yuta Nagoya·Hiroki Wada
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Abstract

We consider the $U(1)$ gauge theory on a four-dimensional torus, where the instanton number is restricted to an integral multiple of $p$. This theory possesses the nontrivial higher-group structure, which can be regarded as a generalization of the Green--Schwarz mechanism, between $\mathbb{Z}_q$ $1$-form and $\mathbb{Z}_{pq}$ $3$-form symmetries. Here, $\mathbb{Z}_q$ is a subgroup of the center of~$U(1)$. Following the recent study of the lattice construction of the $U(1)/\mathbb{Z}_q$ principal bundle, we examine how such a structure is realized on the basis of lattice regularization.

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Naoto Kan, Okuto Morikawa, Yuta Nagoya, Hiroki Wada. 2023-02-27. Higher-group structure in lattice Abelian gauge theory under instanton-sum modification. https://doi.org/10.1140/epjc/s10052-023-11616-6

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