Stable, accelerating universes in modified-gravity theories

Simon DeDeo, Dimitrios Psaltis

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Modifications to gravity that add additional functions of the Ricci curvature to the Einstein-Hilbert action-collectively known as f(R) theories-have been studied in great detail. When considered as complete theories of gravity they can generate nonperturbative deviations from the general relativistic predictions in the solar system, and the simplest models show instabilities on cosmological scales. Here, we show that it is possible to treat f(R)=R±μ4/R gravity in a perturbative fashion such that it shows no instabilities on cosmological scales and, in the solar system, is consistent with measurements of the parametrized post-Newtonian parameters. We show that such a theory produces a spatially flat, accelerating universe, even in the absence of dark energy and when the matter density is too small to close the Universe in the general relativistic case.

Original languageEnglish (US)
Article number064013
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number6
StatePublished - Sep 3 2008

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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