Time travel | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-14

This is an audio version of the Wikipedia Article:
Time travel


00:01:10 1 History of the time travel concept
00:02:25 1.1 Shift to science fiction
00:06:43 2 Time travel in physics
00:08:06 2.1 General relativity
00:09:04 2.1.1 Different spacetime geometries
00:09:58 2.1.2 Wormholes
00:13:03 2.1.3 Other approaches based on general relativity
00:16:00 2.2 Quantum physics
00:16:08 2.2.1 No-communication theorem
00:17:48 2.2.2 Interacting many-worlds interpretation
00:19:21 2.3 Experimental results
00:22:52 2.4 Absence of time travelers from the future
00:24:44 3 Forward time travel in physics
00:24:54 3.1 Time dilation
00:27:22 4 Philosophy
00:27:56 4.1 Presentism vs. eternalism
00:30:56 4.2 The grandfather paradox
00:31:55 4.3 Ontological paradox
00:32:04 4.3.1 Compossibility
00:32:35 4.3.2 Self-consistency principle
00:34:44 5 In fiction



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SUMMARY
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Time travel is the concept of movement between certain points in time, analogous to movement between different points in space by an object or a person, typically using a hypothetical device known as a time machine. Time travel is a widely-recognized concept in philosophy and fiction. The idea of a time machine was popularized by H. G. Wells' 1895 novel The Time Machine. 
It is uncertain if time travel to the past is physically possible. Forward time travel, outside the usual sense of the perception of time, is an extensively-observed phenomenon and well-understood within the framework of special relativity and general relativity. However, making one body advance or delay more than a few milliseconds compared to another body is not feasible with current technology. As for backwards time travel, it is possible to find solutions in general relativity that allow for it, but the solutions require conditions that may not be physically possible.  Traveling to an arbitrary point in spacetime has a very limited support in theoretical physics, and usually only connected with quantum mechanics or wormholes, also known as Einstein-Rosen bridges.