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String theories quantize gravity and aim to a model of a unified theory with the other three interactions which are well described by the standard model for elementary particles. In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String ...


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To complement Ernie's description of the experimental evidence (and some of the theoretical evidence) that gravity must ultimately be 'quantum' in nature there are additional theoretical arguments that gravity waves (which as Ernie said are distinctly prediced by general relativity, even though we haven't observed them yet) must correspond to some ...


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General relativity predicts gravity waves. If subatomic particles deliver the full menu of gravitational effects, they should should agree with the equivalence principle, an important corollary of gravity. Here it is in Einstein's own words: "...the law of the equality of the inertial and gravitational mass is equivalent to the assertion that the ...


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Virtual particles are not real. They come, as I've said in many answers on this site, from a naive interpretation of Feynman diagrams which should not be taken as an actual, exact description of how the physics works. The actual description of an interaction in the quantum field theory is more complicated than "photons are exchanged". In particular, ...



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