arXiv:1708.05014quant-ph
Boundary time crystals
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Abstract
In this work we introduce {\it boundary time-crystals}. Here {\it continuous} time-translation symmetry breaking occurs only in a macroscopic fraction of a many-body quantum system. After introducing their definition and properties, we analyse in detail a solvable model where an accurate scaling analysis can be performed. The existence of the boundary time crystals is intimately connected to the emergence of a time-periodic steady state in the thermodynamic limit of a many-body open quantum system. We also discuss connections to quantum synchronisation.
I wonder if the structure of brain waves is a result of a gravity time crystal. https://arxiv.org/pdf/1708.05014.pdf
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