Joint moments of higher order derivatives of CUE characteristic polynomials I: asymptotic formulae
Keating, J
Wei, F
International Mathematics Research Notices
volume 2024
issue 12
9607-9632
(04 Apr 2024)
Tue, 23 Apr 2024
13:00
13:00
L2
What's done cannot be undone: non-invertible symmetries
Shu-Heng Shao
(Stony Brook University)
Abstract
In massless QED, we find that the classical U(1) chiral symmetry is not completely broken by the Adler-Bell-Jackiw anomaly. Rather, it is resurrected as a generalized global symmetry labeled by the rational numbers. Intuitively, this new global symmetry in QED is a composition of the naive axial rotation and a fractional quantum Hall state. The conserved symmetry operators do not obey a group multiplication law, but a non-invertible fusion algebra. We further generalize our construction to QCD, and show that the neutral pion decay can be derived from a matching condition of the non-invertible global symmetry.
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