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Faster-than-light - Possibility of FTL | A Wisdom Archive on Faster-than-light - Possibility of FTL | | Faster-than-light - Possibility of FTL A selection of articles related to Faster-than-light - Possibility of FTL | |
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Faster-than-light, Faster-than-light - Apparent FTL, Faster-than-light - Astronomical observations, Faster-than-light - General relativity, Faster-than-light - Group velocities above <i>c</i>, Faster-than-light - Moving spot of light, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Phase velocities above c, Faster-than-light - Possibility of FTL, Faster-than-light - Quantum mechanics, Faster-than-light - Relative motion, Faster-than-light - Tachyons, Faster-than-light - Terminology, Faster-than-light - Universal expansion
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ARTICLES RELATED TO Faster-than-light - Possibility of FTL | | | |  Faster-than-light - Possibility of FTL: Encyclopedia II - Faster-than-light - Possibility of FTLFaster-Than-Light travel or communication is problematic in a universe that is consistent with Einstein's Theory of Relativity. In a hypothetical universe where Newton's laws of motion and the Galilean transformations are exact, rather than approximate, the following would be true:
Space and time measurements always give the same results in every 'frame of reference'
Velocities add linearly
There is nothing fundamental about the wave velocity of ligh ...
See also:Faster-than-light, Faster-than-light - Terminology, Faster-than-light - Possibility of FTL, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Tachyons, Faster-than-light - General relativity, Faster-than-light - Apparent FTL, Faster-than-light - Moving spot of light, Faster-than-light - Relative motion, Faster-than-light - Phase velocities above c, Faster-than-light - Group velocities above c, Faster-than-light - Universal expansion, Faster-than-light - Astronomical observations, Faster-than-light - Quantum mechanics Read more here: » Faster-than-light: Encyclopedia II - Faster-than-light - Possibility of FTL |
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| | | | Faster-than-light - Possibility of FTL: Encyclopedia II - Faster-than-light - Apparent FTL
Faster-than-light - Moving spot of light.
Processes which do not transmit information may move faster than light. A good example is a beam of light projected onto a distant surface, such as the Moon. The spot which the beam strikes is not a physical object, just a point of light. Moving it (by reorienting the beam) does not carry information between locations on the surface. To put it another way, the beam can be considered as a stream of photons; where each photon strikes the surface is determined only by the or ...
See also:Faster-than-light, Faster-than-light - Terminology, Faster-than-light - Possibility of FTL, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Tachyons, Faster-than-light - General relativity, Faster-than-light - Apparent FTL, Faster-than-light - Moving spot of light, Faster-than-light - Relative motion, Faster-than-light - Phase velocities above c, Faster-than-light - Group velocities above c, Faster-than-light - Universal expansion, Faster-than-light - Astronomical observations, Faster-than-light - Quantum mechanics Read more here: » Faster-than-light: Encyclopedia II - Faster-than-light - Apparent FTL |
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| | | | Faster-than-light - Possibility of FTL: Encyclopedia II - Faster-than-light - Terminology In the context of this article, FTL actually refers to the transmission of information or matter faster than c, a constant equal to the speed of light in a vacuum, roughly 300 million metres per second. This is not quite the same as travelling faster than light, since:
There are some processes which do propagate faster than c, but which can't actually carry information (See the Apparent FTL section in this article).
Light itself will travel at a speed slower than c when not in a vacuum (causing refr ...
See also:Faster-than-light, Faster-than-light - Terminology, Faster-than-light - Possibility of FTL, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Tachyons, Faster-than-light - General relativity, Faster-than-light - Apparent FTL, Faster-than-light - Moving spot of light, Faster-than-light - Relative motion, Faster-than-light - Phase velocities above c, Faster-than-light - Group velocities above c, Faster-than-light - Universal expansion, Faster-than-light - Astronomical observations, Faster-than-light - Quantum mechanics Read more here: » Faster-than-light: Encyclopedia II - Faster-than-light - Terminology |
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| | | | Faster-than-light - Possibility of FTL: Encyclopedia II - Faster-than-light - Tachyons In special relativity, while it is impossible to accelerate an object to the speed of light, or for a massive object to move at the speed of light, it is not impossible for an object to exist which always moves faster than light. The hypothetical elementary particles that have this property are called tachyons. Their existence has neither been proven nor disproven.
Tachyons are not structurally stable. The equations of relativity do allow faster than light travel, since the equations are symmetric about the velocity 'c', ...
See also:Faster-than-light, Faster-than-light - Terminology, Faster-than-light - Possibility of FTL, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Tachyons, Faster-than-light - General relativity, Faster-than-light - Apparent FTL, Faster-than-light - Moving spot of light, Faster-than-light - Relative motion, Faster-than-light - Phase velocities above c, Faster-than-light - Group velocities above c, Faster-than-light - Universal expansion, Faster-than-light - Astronomical observations, Faster-than-light - Quantum mechanics Read more here: » Faster-than-light: Encyclopedia II - Faster-than-light - Tachyons |
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| | | | Faster-than-light - Possibility of FTL: Encyclopedia II - Faster-than-light - Terminology In the context of this article, FTL actually refers to the transmission of information or matter faster than c, a constant equal to the speed of light in a vacuum, roughly 300 million metres per second. This is not quite the same as travelling faster than light, since:
There are some processes which do propagate faster than c, but which can't actually carry information (See the Apparent FTL section in this article).
Light itself will travel slower than c when not in a vacuum (causing refraction), and in certain materials other particles can travel faster than it (but still slower than ...
See also:Faster-than-light, Faster-than-light - Terminology, Faster-than-light - Possibility of FTL, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Tachyons, Faster-than-light - General relativity, Faster-than-light - Apparent FTL, Faster-than-light - Moving spot of light, Faster-than-light - Relative motion, Faster-than-light - Phase velocities above c, Faster-than-light - Group velocities above c, Faster-than-light - Universal expansion, Faster-than-light - Astronomical observations, Faster-than-light - Quantum mechanics Read more here: » Faster-than-light: Encyclopedia II - Faster-than-light - Terminology |
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| | | | Faster-than-light - Possibility of FTL: Encyclopedia II - Faster-than-light - General relativity General relativity was developed after special relativity, to include concepts like gravity. It maintains the principle that no object can accelerate to the speed of light in its own reference frame. However, it permits distortions in spacetime that allow an object to move faster than light from the point of view of a distant observer, even though it always moved slower than light in its own reference frame. One such distortion is the Alcubierre drive, which can be thought of as producing a ripple in spacetime that carries an object along wi ...
See also:Faster-than-light, Faster-than-light - Terminology, Faster-than-light - Possibility of FTL, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Tachyons, Faster-than-light - General relativity, Faster-than-light - Apparent FTL, Faster-than-light - Moving spot of light, Faster-than-light - Relative motion, Faster-than-light - Phase velocities above c, Faster-than-light - Group velocities above c, Faster-than-light - Universal expansion, Faster-than-light - Astronomical observations, Faster-than-light - Quantum mechanics Read more here: » Faster-than-light: Encyclopedia II - Faster-than-light - General relativity |
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