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A Goldstone theorem for continuous non-invertible symmetries (2211.09570v2)
Published 17 Nov 2022 in hep-th and cond-mat.str-el
Abstract: We study systems with an Adler-Bell-Jackiw anomaly in terms of non-invertible symmetry. We present a new kind of non-invertible charge defect where a key role is played by a local current operator localized on the defect. The charge defects are now labeled by elements of a continuous $U(1)$. We use this construction to prove an analogue of Goldstone's theorem for such non-invertible symmetries. We comment on possible applications to string theory.