Graviton | Wikipedia audio article
Channel: wikipedia tts
Date: 08/12/2018

This is an audio version of the Wikipedia Article:
Graviton


00:01:07 1 Theory
00:01:58 1.1 Gravitons and renormalization
00:02:57 1.2 Comparison with other forces
00:04:07 1.3 Gravitons in speculative theories
00:06:15 2 Energy and wavelength
00:07:50 3 Experimental observation
00:09:35 4 Difficulties and outstanding issues



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SUMMARY
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In theories of quantum gravity, the graviton is the hypothetical elementary particle that mediates the force of gravity. There is no complete quantum field theory of gravitons due to an outstanding mathematical problem with renormalization in general relativity. In string theory, believed to be a consistent theory of quantum gravity, the graviton is a massless state of a fundamental string.  
If it exists, the graviton is expected to be  massless  because the gravitational force is very long range and appears to propagate at the speed of light.  The graviton must be a spin-2 boson because the source of gravitation is the stress–energy tensor, a second-order tensor (compared with electromagnetism's spin-1 photon, the source of which is the four-current, a first-order tensor). Additionally, it can be shown that any massless spin-2 field would give rise to a force indistinguishable from gravitation, because a massless spin-2 field would couple to the stress–energy tensor in the same way that gravitational interactions do. This result suggests that, if a massless spin-2 particle is discovered, it must be the graviton.