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Lattice chiral symmetry from bosons in
Phys. Rev. D 114, 034518 – Published 24 August, 2026
DOI: https://doi.org/10.1103/pxvz-r2gf
Abstract
We present a solvable Hamiltonian that realizes an exact lattice chiral symmetry. Nielsen-Ninomiya-type no-go theorems are evaded by using lattice bosons rather than fermions. The continuum limit is a compact boson field theory with an axionlike coupling. The symmetry shifts the scalar, while acts on local operators associated with short axion strings and is transmuted into a higher-form symmetry in the continuum limit. We demonstrate the chiral anomaly by showing that the lattice theta angle is shifted by an axial rotation when is gauged. Gauging either or leads to lattice noninvertible and 2-group symmetries, respectively, matching the continuum picture.
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