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“Physics in the 20th century was built on two great revolutions: the general theory of relativity and quantum mechanics. ... It illustrates how, quantum theory and general relativity will only be unified when theory meets experiment. The Standard Model of particle physics explains fundamental interactions in terms of the trade of field particles between basic matter particles; yet gravity on the other hand does not fit the Model. Einstein explains the reason they cannot work with gravity, gravitational forces result from the curvature of the space-time continuum.
There are two obvious routes to quantum gravity. The first, as described in the article, is to formulate general relativity into a quantum field theory in which the gravitational force is carried by the exchange of gravitons. The second route to quantum gravity, however, starts with general relativity and involves completely rewriting quantum theory.
Approximate Word count = 638
Approximate Pages = 2.6
(250 words per page double spaced)
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