Faster-than-light drive | Wikipedia audio article
Channel: wikipedia tts
Date: 06/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Faster-than-light


00:01:25 1 Superluminal travel of non-information
00:02:59 1.1 Daily sky motion
00:04:19 1.2 Light spots and shadows
00:05:17 1.3 Apparent FTL propagation of static field effects
00:06:24 1.4 Closing speeds
00:08:50 1.5 Proper speeds
00:09:49 1.6 Possible distance away from Earth
00:11:50 1.7 Phase velocities above ic/i
00:12:48 1.8 Group velocities above ic/i
00:14:15 1.9 Universal expansion
00:17:06 1.10 Astronomical observations
00:18:10 1.11 Quantum mechanics
00:20:49 1.11.1 Hartman effect
00:22:03 1.11.2 Casimir effect
00:22:57 1.11.3 EPR paradox
00:25:03 1.11.4 Delayed choice quantum eraser
00:26:13 2 Superluminal communication
00:29:11 3 Justifications
00:29:21 3.1 Relative permittivity or permeability less than 1
00:30:26 3.2 Casimir vacuum and quantum tunnelling
00:37:25 3.3 Give up (absolute) relativity
00:38:34 3.4 Spacetime distortion
00:41:12 3.5 Heim theory
00:41:35 3.6 Lorentz symmetry violation
00:44:03 3.7 Superfluid theories of physical vacuum
00:45:23 4 Time of flight of neutrinos
00:45:33 4.1 MINOS experiment
00:46:18 4.2 OPERA neutrino anomaly
00:47:53 5 Tachyons
00:48:43 6 Exotic matter
00:53:39 7 General relativity
00:56:00 8 Variable speed of light
00:58:24 9 See also



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SUMMARY
=======
Faster-than-light (also superluminal or FTL) communication and travel are the conjectural propagation of information or matter faster than the speed of light.
The special theory of relativity implies that only particles with zero rest mass may travel at the speed of light. Tachyons, particles whose speed exceeds that of light, have been hypothesized, but their existence would violate causality, and the consensus of physicists is that they cannot exist. On the other hand, what some physicists refer to as "apparent" or "effective" FTL depends on the hypothesis that unusually distorted regions of spacetime might permit matter to reach distant locations in less time than light could in normal or undistorted spacetime.
According to the current scientific theories, matter is required to travel at slower-than-light (also subluminal or STL) speed with respect to the locally distorted spacetime region. Apparent FTL is not excluded by general relativity; however, any apparent FTL physical plausibility is speculative. Examples of apparent FTL proposals are the Alcubierre drive and the traversable wormhole.