There have been numerous papers on these topics and if you're interested in more in depth understanding of the issus, I refer you to Klaus Scharnhorst's article here: http://www.nat.vu.nl/~scharnh/m16scine.htm, Matt Visser, Stefano Liberati, and Sebastiano Sonego's article "Faster-than-c signals, special relativity, and causality" from Annals Phys. edition 298, Superluminal Tunneling Devices by Gunter Nimtz available online here: http://cdsweb.cern.ch/record/547324/files/0204043.pdf?version=1, and "Can Light Signals Travel Faster than c in Nontrivial Vacuua in Flat space-time? Relativistic Causality II" by Heidi Fearn. | There have been numerous papers on these topics and if you're interested in more in depth understanding of the issus, I refer you to Klaus Scharnhorst's article here: http://www.nat.vu.nl/~scharnh/m16scine.htm, Matt Visser, Stefano Liberati, and Sebastiano Sonego's article "Faster-than-c signals, special relativity, and causality" from Annals Phys. edition 298, Superluminal Tunneling Devices by Gunter Nimtz available online here: http://cdsweb.cern.ch/record/547324/files/0204043.pdf?version=1, and "Can Light Signals Travel Faster than c in Nontrivial Vacuua in Flat space-time? Relativistic Causality II" by Heidi Fearn. |