Illusions of general relativity in Brans-Dicke gravity

Details Illusions of general relativity in Brans-Dicke gravity Illusions of general relativity in Brans-Dicke gravity

1999-02-26

arxiv.org/abs/gr-qc/9902083v1

Phys.Rev.D59:084021,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages, LaTeX, to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.59.084021

Contrary to common belief, the standard tenet of Brans-Dicke theory reducing to general relativity when omega tends to infinity is false if the trace of the matter energy-momentum tensor vanishes. The issue is clarified in a new approach using conformal transformations. The otherwise unaccountable limiting behavior of Brans-Dicke gravity is easily understood in terms of the conformal invariance of the theory when the sources of gravity have radiation-like properties. The rigorous computation of the asymptotic behavior of the Brans-Dicke scalar field is straightforward in this new approach.

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