Faster than Light Neutrinos revisited
CERN’s measurements of neutrinos traveling faster than the speed of light immediately started speculation that it showed a problem with Special Relativity. However this speculation is exaggerated.since not being able to travel at or faster than the speed of light only applies to particles with a real non zero rest mass. A particle like a photon that has a zero rest mass travels at the speed of light. Particles that travel faster than light have been speculated for years under the name tachyons. Tachyons would have a negative imaginary rest mass giving it a real non zero mass at speeds above the speed of light. It would however be incapable of being
decelerated to the speed of light below it.