Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-27
Phys.Rev.Lett.98:131302,2007
Astronomy and Astrophysics
Astrophysics
4 pages; v2: revised figure and minor changes to match version accepted on Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.98.131302
All $f(R)$ modified gravity theories are conformally identical to models of quintessence in which matter is coupled to dark energy with a strong coupling. This coupling induces a cosmological evolution radically different from standard cosmology. We find that in all $f(R)$ theories that behave as a power of $R$ at large or small $R$ (which include most of those proposed so far in the literature) the scale factor during the matter phase grows as $t^{1/2}$ instead of the standard law $t^{2/3}$. This behaviour is grossly inconsistent with cosmological observations (e.g. WMAP), thereby ruling out these models even if they pass the supernovae test and can escape the local gravity constraints.
Amendola Luca
Polarski David
Tsujikawa Shinji
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