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Cosmological perturbations in Palatini-modified gravity
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Uddin, Kotub, Lidsey, James E. and Tavakol, Reza (2007) Cosmological perturbations in Palatini-modified gravity. Classical and Quantum Gravity, 24 (15). p. 3951. doi:10.1088/0264-9381/24/15/012 ISSN 0264-9381.
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Official URL: http://dx.doi.org/10.1088/0264-9381/24/15/012
Abstract
Two approaches to the study of cosmological density perturbations in modified theories of Palatini gravity have recently been discussed. These utilize, respectively, a generalization of Birkhoff's theorem and a direct linearization of the gravitational field equations. In this paper these approaches are compared and contrasted. The general form of the gravitational Lagrangian for which the two frameworks yield identical results in the long-wavelength limit is derived. This class of models includes the case where the Lagrangian is a power-law of the Ricci curvature scalar. The evolution of density perturbations in theories of the type f(R) = R − c/Rb is investigated numerically. It is found that the results obtained by the two methods are in good agreement on sufficiently large scales when the values of the parameters (b, c) are consistent with current observational constraints. However, this agreement becomes progressively poorer for models that differ significantly from the standard concordance model and as smaller scales are considered.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||
Journal or Publication Title: | Classical and Quantum Gravity | ||||||
Publisher: | IOP Publishing Inc. | ||||||
ISSN: | 0264-9381 | ||||||
Official Date: | 17 July 2007 | ||||||
Dates: |
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Volume: | 24 | ||||||
Number: | 15 | ||||||
Page Range: | p. 3951 | ||||||
DOI: | 10.1088/0264-9381/24/15/012 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
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