subluminal
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subluminal — adjective slower than light; having a speed less than light. Syn: sublumic See Also: superluminal, transluminal, luminal … Wiktionary
Faster-than-light — (also superluminal or FTL) communications and travel refer to the propagation of information or matter faster than the speed of light. Science fiction style space travel, dubbed true FTL, defies known physics.Under the special theory of… … Wikipedia
Speed of light — The speed of light in the vacuum of free space is an important physical constant usually denoted by the letter c . [NIST and BIPM practice is to use c 0 for the speed of light in vacuum in accord with international standard ISO 31 5. See… … Wikipedia
Phase velocity — periodic gravity waves on the surface of deep water. The red dot moves with the phase velocity, and is located at a fixed wave phase: the crest for the case shown.The phase velocity (or phase speed) of a wave is the rate at which the phase of the … Wikipedia
Superluminal communication — is the term used to describe the hypothetical process by which one might send information at faster than light (FTL) speeds. All empirical evidence found by scientific investigation indicates that it s impossible in the real world.Some theories… … Wikipedia
Tachyon — A tachyon (from the Greek polytonic|ταχυόνιον, takhyónion , from polytonic|ταχύς, takhýs , i.e. swift, fast) is any hypothetical particle that travels at faster than light speed. The first description of tachyons is attributed to German physicist … Wikipedia
Wormhole — In physics, a wormhole is a hypothetical topological feature of spacetime that is fundamentally a shortcut through space and time. Spacetime can be viewed as a 2D surface, and when folded over, a wormhole bridge can be formed. A wormhole has at… … Wikipedia
No-communication theorem — In quantum information theory, a no communication theorem is a result which gives conditions under which instantaneous transfer of information between two observers is impossible. These results can be applied to understand the so called paradoxes … Wikipedia
Scharnhorst effect — The Scharnhorst effect is a hypothetical phenomenon in which the speed of light is slightly greater between two closely spaced conducting plates than it is in a normal vacuum. It was predicted by Klaus Scharnhorst of the Humboldt University of… … Wikipedia
Physical Research Laboratory — The Physical Research Laboratory is a national Indian centre for research in space and allied sciences, supported mainly by Department of Space. This research laboratory currently has ongoing research programmes over astronomy and astrophysics,… … Wikipedia
