(2000), who produced a laser pulse in atomic cesium gas with a group velocity of Experiments showing group velocities greater than c include that of Wang et al. Phase velocity and group velocity of a wave may exceed the speed of light, but in suchĬases, no energy or information actually travels faster than c. 1952, Brillouin and Sommerfeld 1960,īorn and Wolf 1999, Landau and Lifschitz 1997), there is nothing preventing "apparent" motion faster than c (or, inįact, with negative speeds, implying arrival at a destination before leaving the origin). Information from traveling faster than the speed of light c (Lorentz et al.
It should be noted that while Einstein's theory of special relativity prevents (real) mass, energy, or There is a putative class of particles dubbed tachyons which are able to travel faster than light.įaster-than-light phenomena violate the usual understanding of the "flow" of time, a state of affairs which is knownĪs the causality problem (and also called the "Shalimar Treaty"). Rodrigues, Jr.Ī superluminal phenomenon is a frame of reference traveling with a speed greater than the speed of light c. Portions of this entry contributed by Waldyr A. Superluminal - from Eric Weisstein's World of Physics
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