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Are f(R) dark energy models cosmologically viable ? | | Luca Amendola
; David Polarski
; Shinji Tsujikawa
; | | Date: |
27 Mar 2006 | | 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. | | Source: | arXiv, astro-ph/0603703 | | Other source: | [GID 797010] pmid17501182 | | Services: | Forum | Review | PDF | Favorites | |
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