Journal
ASTRONOMY & ASTROPHYSICS
Volume 454, Issue 3, Pages 707-714Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20064994
Keywords
gravitation; cosmological parameters; cosmology : observations; cosmology : theory; large-scale structure of Universe
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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.
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