Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-04-22
Phys.Rev.D78:046006,2008
Physics
High Energy Physics
High Energy Physics - Theory
16 pages, discussion is enlarged, version to appear in PRD
Scientific paper
10.1103/PhysRevD.78.046006
We study the future evolution of quintessence/phantom dominated epoch in modified $F(R)$-gravity which unifies the early-time inflation with late-time acceleration and which is consistent with observational tests. Using the reconstruction technique it is demonstrated that there are models where any known (Big Rip, II, III or IV Type) singularity may classically occur. From another side, in Einstein frame (scalar-tensor description) only IV Type singularity occurs. Near the singularity the classical description breaks up, it is demonstrated that quantum effects act against the singularity and may prevent its appearance. The realistic $F(R)$-gravity which is future singularity free is proposed. We point out that additional modification of any $F(R)$-gravity by the terms relevant at the early universe is possible, in such a way that future singularity does not occur even classically.
Nojiri Shin'ichi
Odintsov Sergei D.
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