'Time crystals' idea is challenged but its proponent doubles down.
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References
Bruno, P. Phys. Rev. Lett. 111, 070402 (2013).
Wilczek, F. Preprint at http://arxiv.org/abs/1308.5949 (2013).
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"Time Crystals" Could Be a Legitimate Form of Perpetual Motion
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Powell, D. Can matter cycle through shapes eternally?. Nature (2013). https://doi.org/10.1038/nature.2013.13657
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DOI: https://doi.org/10.1038/nature.2013.13657