Superfluidity and Space-Time Translation Symmetry Breaking

I present a simple model that exhibits a temporal analogue of superconducting crystalline (LOFF) ordering. 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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