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- W3100113428 endingPage "143001" @default.
- W3100113428 startingPage "143001" @default.
- W3100113428 abstract "We review various classical unified theories of gravity and other interactions that have appeared in the literature, paying special attention to scenarios in which spacetime remains four-dimensional, while an internal space is enlarged. The starting point for each such unification scenario is a particular formalism for General Relativity. We thus start by reviewing, besides the usual Einstein-Hilbert and Palatini formulations, the Einstein-Cartan, MacDowell-Mansouri and BF (both non-chiral and chiral) formulations. Each of these introduces some version of internal bundle and a dynamical variable that ties the internal and tangent bundles. In each of these formulations there is also an independent connection in the internal bundle. One can then study the effects of enlarging the internal space, which typically leads to a theory of gravity and Yang-Mills fields. We review what has been done in the literature on each of these unification schemes, and compare and contrast their achievements to those of the better developed Kaluza-Klein scenario." @default.
- W3100113428 created "2020-11-23" @default.
- W3100113428 creator A5055796078 @default.
- W3100113428 creator A5064326167 @default.
- W3100113428 date "2018-06-15" @default.
- W3100113428 modified "2023-10-14" @default.
- W3100113428 title "Gravity and unification: a review" @default.
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