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ThunderLight
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If general relativity in the formal sense constrains all velocities to the speed of light as a maximum, how would superluminal group velocities exceeding speeds of light (at their superpositions) be evaluated in mainstream physics? Would this be a case of General Relativity and Physics principles Violation?
An example is a paper reporting superluminal group velocities measured:
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.88.073901
An example is a paper reporting superluminal group velocities measured:
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.88.073901