Lattice Realization of the Axial U(1) Noninvertible Symmetry

Author:

Honda Yamato1,Morikawa Okuto2ORCID,Onoda Soma1,Suzuki Hiroshi1ORCID

Affiliation:

1. Department of Physics, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395 , Japan

2. Department of Physics, Osaka University , Toyonaka, Osaka 560-0043 , Japan

Abstract

Abstract In U(1) lattice gauge theory with compact U(1) variables, we construct the symmetry operator, i.e. the topological defect, for the axial U(1) noninvertible symmetry. This requires a lattice formulation of chiral gauge theory with an anomalous matter content and we employ the lattice formulation on the basis of the Ginsparg–Wilson relation. The invariance of the symmetry operator under the gauge transformation of the gauge field on the defect is realized, imitating the prescription by Karasik in continuum theory, by integrating the lattice Chern–Simons term on the defect over smooth lattice gauge transformations. The projection operator for allowed magnetic fluxes on the defect then emerges with lattice regularization. The resulting symmetry operator is manifestly invariant under lattice gauge transformations. In an appendix, we give another way of constructing the symmetry operator on the basis of a 3D $\mathbb {Z}_N$ topological quantum field theory, the level-N BF theory on the lattice.

Funder

SCOAP

Publisher

Oxford University Press (OUP)

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