Constraining f(R) gravity models with disappearing cosmological constant

I. Thongkool, M. Sami, RADOUANE GANNOUJI , S. Jhingan

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

The f(R) gravity models proposed by Hu-Sawicki and Starobinsky are generic for local gravity constraints to be evaded. The large deviations from these models result in either violation of local gravity constraints or the modifications indistinguishable from cosmological constant. The curvature singularity in these models is generic but can be avoided, provided that proper fine-tuning is imposed on the evolution of scalaron in the high curvature regime. In principle, the problem can be circumvented by incorporating quadratic curvature correction in the Lagrangian, though it might be quite challenging to probe the relevant region numerically.

Original languageEnglish
Article number043523
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume80
Issue number4
DOIs
StatePublished - 24 Aug 2009

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