Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-01-07
Int.J.Mod.Phys. D13 (2004) 2193-2240
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
RevTeX, 34 pages. Review article to be published by Int. J. Mod. Phys. D
Scientific paper
10.1142/S0218271804006462
The role played by torsion in gravitation is critically reviewed. After a description of the problems and controversies involving the physics of torsion, a comprehensive presentation of the teleparallel equivalent of general relativity is made. According to this theory, curvature and torsion are alternative ways of describing the gravitational field, and consequently related to the same degrees of freedom of gravity. However, more general gravity theories, like for example Einstein-Cartan and gauge theories for the Poincare and the affine groups, consider curvature and torsion as representing independent degrees of freedom. By using an active version of the strong equivalence principle, a possible solution to this conceptual question is reviewed. This solution favors ultimately the teleparallel point of view, and consequently the completeness of general relativity. A discussion of the consequences for gravitation is presented.
Arcos Hector Ivan
Pereira J. G.
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