It is said phonon(not photon) in superfluid experiments could also produce similar upper-limit speed effect which I'm not sure if that's also Lorentz invariant.(adsbygoogle = window.adsbygoogle || []).push({});

Another problem is that I can't dig out those paper that demonstrates this kind of effect. Anyone ever seen any of this paper? Thanks..

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# Phonon Lorentz invariant?

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