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Are f(R) dark energy models cosmologically viable ?

Authors
  • Amendola, L.
  • Polarski, D.
  • Tsujikawa, S.
Publication Date
Jan 01, 2007
Source
HAL-IN2P3
Keywords
Language
English
License
Unknown
External links

Abstract

We show that all f(R) modified gravity theories are conformally identical to models of quintessence in which matter is coupled to dark energy with a large coupling. This strong 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 all 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.

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