Appreciating the classical elegance of time crystals

Structures known as ‘time crystals’ — which repeat in time as conventional crystals repeat in space — have recently captured the interest and imagination of researchers across disciplines. The concept has emerged from the context of quantum many-body systems, but physicists have now developed a versatile framework that clarifies connections to classical works dating back nearly two centuries, thus providing a unifying platform to explore seemingly dissimilar phenomena.

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