%0 Journal Article
%T Are f(R) dark energy models cosmologically viable ?
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Amendola, L.
%A Polarski, D.
%A Tsujikawa, S.
%Z 4 pages
%< avec comité de lecture
%Z PTA/06-28
%@ 0031-9007
%J Physical Review Letters
%I American Physical Society
%V 98
%P 131302
%8 2007
%D 2007
%Z astro-ph/0603703
%R 10.1103/PhysRevLett.98.131302
%Z Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
%Z Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
%Z Physics [physics]/High Energy Physics - Theory [hep-th]Journal articles
%X 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.
%G English
%L in2p3-00115618
%U https://hal.in2p3.fr/in2p3-00115618
%~ IN2P3
%~ LPTA
%~ CNRS
%~ UNIV-MONTP2
%~ UNIV-MONTPELLIER
%~ UM1-UM2