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In the experiment, the crystals were driven by RF excitation. Do time crystals generally require a constant energy source to oscillate? I would assume not, since they're called crystals...

Also, is the oscillation frequency temperature dependent?

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Unfortunately, time crystals do require an external excitation. The key is that the excitation does not have the same frequency as the time crystal.

Exactly, thinking about a parametric oscillation might help

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