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Thursday, November 1 2018

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The old cosmological constant problem - why do we not see the gravitational effects of the large vacuum energy predicted by particle physics? - is an outstanding problem for cosmologists, relativists, and particle physicists alike. One possibility is that gravity is modified in such a way that the cosmological constant does not gravitate the way it does general relativity, though there are few (if any) concrete and realistic models along these lines.