Is the physical vacuum a preferred frame
2008
It is generally assumed that the physical vacuum of particle physics should be characterized by an energy-momentum tensor in such a way as to preserve exact Lorentz invariance. On the other hand, if the ground state were characterized by its energy-momentum vector, with zero spatial momentum and a non-zero energy, the vacuum would represent a preferred frame. Since both theoretical approaches have their own good motivations, we propose an experimental test to decide between the two scenarios.
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