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The more I look at this, the more interesting it becomes.
It seems the ripples arise due to spontaneous symmetry breaking, but the ripples are themselves, caused by interaction between 'flexural phonons'.
This mechanism is similar to what happens in crystal oscillators.
The propagation of Phonons through a crystal lattice, also reminds me of density waves in the arms of a spiral galaxy.
Interesting.
Cheers
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