Practical solutions for perturbed f(R) gravity
Name
Hojjati-2012-Practical solutions for perturbed.pdf
Size
6.63 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Hojjati, Alireza
Pogosian, Levon
Silvestri, Alessandra
Talbot, Starla
Date Issued
December 2012
Journal
Physical Review D
Publisher
American Physical Society
Citation
Hojjati, Alireza et al. “Practical Solutions for Perturbed f(R) Gravity.” Physical Review D 86.12 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
We examine the accuracy of the quasistatic approximation and a parametric form commonly employed for evolving linear perturbations in f(R) gravity theories and placing cosmological constraints. In particular, we analyze the nature and the importance of the near-horizon effects that are often neglected. We find that for viable models, with a small present value of the scalaron field, such corrections are entirely negligible with no impact on observables. We also find that the one-parameter form, commonly used to represent the modified equations for linear perturbations in f(R), leads to theoretical systematic errors that are relatively small and, therefore, is adequate for placing constraint on f(R) models.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.86.123503
