The experimental evidence for electromagnetic signals propagating with superluminal group velocity is recalled. Transformations of space and time depending on a synchronization parameter, e1, indicate the existence of a privileged inertial system. The Lorentz transformations are obtained for a particular e1≠0. No standard experiment on relativity depends on e1, but if accelerations are considered only e1=0 remains possible. The causal paradox generated by superluminal signals (SLS) in the theory of relativity does not exist in the theory with e1=0. The irrelevance of SLS for the Einstein, Podolsky and Rosen paradox is pointed out.
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Selleri, F. Superluminal Signals and the Resolution of the Causal Paradox. Found Phys 36, 443–463 (2006). https://doi.org/10.1007/s10701-005-9028-6
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DOI: https://doi.org/10.1007/s10701-005-9028-6