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In analogy with crystalline solids around us, Wilczek recently proposed the idea of "time crystals" as phases that spontaneously break the continuous time translation into a discrete subgroup.
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E. Castillo, B. Koch, and G. Palma, On the dynamics of fluctuations in time crystals
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M. Thies, Semiclassical time crystal in the chiral Gross-Neveu model
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