query: Group and phase velocity - why can the latter be faster than light?
positive_passages.docid: 128320
positive_passages.text: In superluminal phase velocities, what is it that is traveling faster than light?
negative_passages.docid: 128965
negative_passages.text: Photon pair production at relativistic speeds?
negative_passages.docid: 64822
negative_passages.text: Why is speed defined like it is?
negative_passages.docid: 148196
negative_passages.text: Does the speed of light in different mediums affect the lorentz transformation?
negative_passages.docid: 2154
negative_passages.text: Why doesn't gravity speed up light?
negative_passages.docid: 75580
negative_passages.text: Derivation of the speed of light using the integral forms of Maxwell's Equations
negative_passages.docid: 93598
negative_passages.text: Is it proven experimentally that the speed of causality (light) is the maximum speed?
negative_passages.docid: 73660
negative_passages.text: Relativistic Doppler effect derivation
negative_passages.docid: 26363
negative_passages.text: How does faster than light travel violate causality?
negative_passages.docid: 47568
negative_passages.text: Is it experimentally proven that photons travel at speed $c$ in vacuum?
negative_passages.docid: 155657
negative_passages.text: argument about fallacy of diff(M) being a gauge group for general relativity
negative_passages.docid: 119953
negative_passages.text: What is the meaning of speed of light $c$ in $E=mc^2$?
negative_passages.docid: 14186
negative_passages.text: Is it possible for information to be transmitted faster than light by using a rigid pole?
negative_passages.docid: 96657
negative_passages.text: The speed of light as it approaches a massive body
negative_passages.docid: 120621
negative_passages.text: Speed of Dark experiment, does it *really* travel faster than light?
negative_passages.docid: 820
negative_passages.text: Photons are faster than the speed of light because they travel in transversal waves?
negative_passages.docid: 77372
negative_passages.text: "Speed" of Gravity and Speed of Light