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Issue A&A
Volume 454, Number 3, August II 2006
Page(s) 707 - 714
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20064994



A&A 454, 707-714 (2006)
DOI: 10.1051/0004-6361:20064994

Cosmological constraints on f(R) gravity theories within the Palatini approach

M. Amarzguioui1, Ø. Elgarøy1, 2, D. F. Mota1 and T. Multamäki2, 3

1  Institute of Theoretical Astrophysics, University of Oslo, Box 1029, 0315 Oslo, Norway
    e-mail: morad@astro.uio.no
2  NORDITA, Blegdamsvej 17, 2100 Copenhagen, Denmark
3  Department of Physics, University of Turku, 20014 Turku, Finland

(Received 9 February 2006 / Accepted 30 March 2006 )

Abstract
We investigate f(R) theories of gravity within the Palatini approach and show how one can determine the expansion history, H(a), for an arbitrary choice of f(R). As an example, we consider cosmological constraints on such theories arising from the supernova type Ia, large-scale structure formation, and cosmic microwave background observations. We find that the best fit to the data is a non-null leading order correction to the Einstein gravity. However, the current data exhibits no significant trend toward such corrections compared to the concordance $\Lambda$CDM model. Our results show that the oft-considered 1/R models are not compatible with the data. The results demonstrate that background expansion alone can act as a good discriminator between modified gravity models when multiple data sets are used.


Key words: gravitation -- cosmological parameters -- cosmology: observations -- cosmology: theory -- large-scale structure of Universe



© ESO 2006

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