Are f(R) dark energy models cosmologically viable?

Luca Amendola*, David Polarski, Shinji Tsujikawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

428 Citations (Scopus)


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 where a power of R is dominant 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 t1/2 instead of the standard law t2/3. This behavior is grossly inconsistent with cosmological observations (e.g., Wilkinson Microwave Anisotropy Probe), thereby ruling out these models even if they pass the supernovae test and can escape the local gravity constraints.

Original languageEnglish
Article number131302
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 2007 Mar 30
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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