Superfluidity and space-time translation symmetry breaking.

  title={Superfluidity and space-time translation symmetry breaking.},
  author={Frank Wilczek},
  journal={Physical review letters},
  volume={111 25},
  • F. Wilczek
  • Published 27 August 2013
  • Physics
  • Physical review letters
I present a simple model that exhibits a temporal analogue of superconducting crystalline (Larkin-Ovchinnikov-Ferrell-Fulde) ordering, with a time-dependent order parameter. I sketch designs for minimally dissipative ac circuits, all based on time translation symmetry (τ) invariant dynamics, exploiting weak links (Josephson effects). These systems violate τ spontaneously. I also discuss effective theories of that phenomenon, and space-time generalizations. 

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