Practical solutions for perturbed f(R) gravity
Author(s)
Hojjati, Alireza; Pogosian, Levon; Silvestri, Alessandra; Talbot, Starla
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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.
Date issued
2012-12Department
Massachusetts Institute of Technology. Department of PhysicsJournal
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
ISSN
1550-7998
1089-4918