Curvature of spacetime | Wikipedia audio article
Channel: wikipedia tts
Date: 28/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/General_relativity


00:03:01 1 History
00:08:04 2 From classical mechanics to general relativity
00:08:41 2.1 Geometry of Newtonian gravity
00:12:26 2.2 Relativistic generalization
00:17:10 2.3 Einstein's equations
00:21:17 2.4 Alternatives to general relativity
00:21:47 3 Definition and basic applications
00:22:15 3.1 Definition and basic properties
00:24:33 3.2 Model-building
00:28:01 4 Consequences of Einstein's theory
00:28:28 4.1 Gravitational time dilation and frequency shift
00:29:56 4.2 Light deflection and gravitational time delay
00:31:42 4.3 Gravitational waves
00:33:54 4.4 Orbital effects and the relativity of direction
00:34:27 4.4.1 Precession of apsides
00:37:12 4.4.2 Orbital decay
00:38:48 4.4.3 Geodetic precession and frame-dragging
00:40:21 5 Astrophysical applications
00:40:32 5.1 Gravitational lensing
00:42:06 5.2 Gravitational wave astronomy
00:43:45 5.3 Black holes and other compact objects
00:46:17 5.4 Cosmology
00:50:36 5.5 Time travel
00:51:19 6 Advanced concepts
00:51:29 6.1 Causal structure and global geometry
00:52:53 6.2 Horizons
00:56:37 6.3 Singularities
00:59:16 6.4 Evolution equations
01:00:45 6.5 Global and quasi-local quantities
01:02:25 7 Relationship with quantum theory
01:02:56 7.1 Quantum field theory in curved spacetime
01:04:13 7.2 Quantum gravity
01:07:53 8 Current status
01:09:16 9 See also



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SUMMARY
=======
General relativity (GR, also known as the general theory of relativity or GTR) is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics. General relativity generalizes special relativity and Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or spacetime. In particular, the curvature of spacetime is directly related to the energy and momentum of whatever matter and radiation are present. The relation is specified by the Einstein field equations, a system of partial differential equations.
Some predictions of general relativity differ significantly from those of classical physics, especially concerning the passage of time, the geometry of space, the motion of bodies in free fall, and the propagation of light. Examples of such differences include gravitational time dilation, gravitational lensing, the gravitational redshift of light, and the gravitational time delay. The predictions of general relativity in relation to classical physics have been confirmed in all observations and experiments to date. Although general relativity is not the only relativistic theory of gravity, it is the simplest theory that is consistent with experimental data. However, unanswered questions remain, the most fundamental being how general relativity can be reconciled with the laws of quantum physics to produce a complete and self-consistent theory of quantum gravity.
Einstein's theory has important astrophysical implications. For example, it implies the existence of black holes—regions of space in which space and time are distorted in such a way that nothing, not even light, can escape—as an end-state for massive stars. There is ample evidence that the intense radiation emitted by certain kinds of astronomical objects is due to black holes; for example, microquasars and active galactic nuclei result from the presence of stellar black holes and supermassive black holes, respectively. The bending of light by gravity can lead to the phenomenon of gravitational lensing, in which multiple images of the same distant astronomical object are visible in the sky. General relativity also predicts the existence of gravitational waves, which have since been observed directly by the physics collaboration LIGO. In addition, general relativity ...