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Scalar field mass in generalized gravity

Valerio Faraoni

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The notions of mass and range of a Brans–Dicke-like scalar field in scalar–tensor and f(R) gravity are subject to an ambiguity that hides a potential trap. We spell out this ambiguity and identify a physically meaningful and practical definition for these quantities. This is relevant when giving a mass to this scalar in order to circumvent experimental limits on the PPN parameters coming from solar system experiments.


PACS

04.20.Jb Exact solutions

04.50.-h Higher-dimensional gravity and other theories of gravity

MSC

83C15 Exact solutions

83C45 Quantization of the gravitational field

Subjects

Gravitation and cosmology

Dates

Issue 14 (21 July 2009)

Received 22 March 2009, in final form 2 June 2009

Published 29 June 2009



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