Abstract
In the approximation that every inertial observer experiences a homogeneous, uniform flow of time and sees a space that is Euclidean, the arena of physics is Minkowskian and one speed is the same in all intertial frames. If a given intertial observer finds an infinitesimal source or particle traveling faster than this fundamental speed near a given event, the source must appear in some inertial frame spread over neighboring positions at a given time as a spacelike structure. If this structure persists over a period of proper time, it can be interpreted as a wave group. If it is conserved, it can be interpreted as a line or tube of force.
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Duffey, G.H. Tachyons and superluminal wave groups. Found Phys 5, 349–354 (1975). https://doi.org/10.1007/BF00717449
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DOI: https://doi.org/10.1007/BF00717449