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Scalar-tensor theories with an external scalar

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arxiv 1503.07581 v3 pith:QY2CNTSL submitted 2015-03-25 gr-qc astro-ph.CO

Scalar-tensor theories with an external scalar

Bertrand Chauvineau , Davi C. Rodrigues , J\'ulio C. Fabris This is my paper
classification gr-qc astro-ph.CO
keywords externalgravityscalar-tensorfieldpartparticularscalarsolution
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Scalar-tensor (ST) gravity is considered in the case where the scalar is an external field. We show that General Relativity (GR) and usual ST gravity are particular cases of the External Scalar-Tensor (EST) gravity. It is shown with a particular cosmological example that it is possible to join a part of a GR solution to a part of a ST one such that the complete solution neither belongs to GR nor to ST, but fully satisfies the EST field equations. We argue that external fields may effectively work as a type of screening mechanism for ST theories.

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