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asimov42
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Posting as this was buried in another thread - If Lorentz invariance is broken in, e.g., whatever theory of quantum gravity turns out to be correct, what effect would this have (if one can speculate) on the physical vacuum? That is, for two observers, let's say, moving at different, constant velocities (so Unruh effect aside, for now) relative to the 'preferred' frame, would the vacuum 'appear differently'? My naive thought is that there would be some measurable effect on the field modes... does this have any influence on field excitations, or does the vacuum still look empty no matter which may you're going?