Noninvertible Time-Reversal Symmetry

Aug 8, 2022
31 pages
Published in:
  • Phys.Rev.Lett. 130 (2023) 13, 131602
  • Published: Mar 28, 2023
e-Print:
Report number:
  • YITP-SB-2022-28,
  • MIT-CTP/5457

Citations per year

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Abstract: (APS)
In gauge theory, it is commonly stated that time-reversal symmetry only exists at θ=0 or π for a 2π-periodic θ angle. In this Letter, we point out that in both the free Maxwell theory and massive QED, there is a noninvertible time-reversal symmetry at every rational θ angle, i.e., θ=πp/N. The noninvertible time-reversal symmetry is implemented by a conserved, antilinear operator without an inverse. It is a composition of the naive time-reversal transformation and a fractional quantum Hall state. We also find similar noninvertible time-reversal symmetries in non-Abelian gauge theories, including the N=4 SU(2) super Yang-Mills theory along the locus |τ|=1 on the conformal manifold.
Note:
  • 31 pages
  • time reversal: symmetry
  • space: conformal
  • gauge field theory: Yang-Mills
  • quantum electrodynamics: massive
  • gauge field theory: nonabelian
  • supersymmetry
  • fractional
  • pi p
  • SU(2)
  • conservation law