Ref HAL: in2p3-00115597_v1
Ref Arxiv: astro-ph/0605384
DOI: 10.1142/S0218271807010936
WoS: 000252849500002
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
84 Citations
Résumé:

In the recent paper astro-ph/0603703 we have shown that $f(R)=R+\mu R^n$ modified gravity dark energy models are not cosmologically viable because during the matter era that precedes the accelerated stage the cosmic expansion is $a ~ t^{1/2}$ rather than $t^{2/3}$. In this short note we wish to comment on the recent paper astro-ph/0604431 which criticised our results. We show here that the $R^n$ models presented in astro-ph/0604431 cannot generate a stage with $a ~ t^{2/3}$ preceding a stage of accelerated expansion. Hence, though acceptable $f(R)$ dark energy models might exist, the $R^n$ models presented in astro-ph/0604431 are not viable, confirming our previous results.

Commentaires: 3 pages