Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-12-20
Phys.Lett.B646:105-111,2007
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX file, 9 pages. Some references are added. The version to appear in Physcs Letters B
Scientific paper
10.1016/j.physletb.2007.01.013
It is shown that phantom scalar models can be mapped into a mathematically equivalent, modified $F(R)$ gravity, which turns out to be complex, in general. Only for even scalar potentials is the ensuing modified gravity real. It is also demonstrated that, even in this case, modified gravity becomes complex at the region where the original phantom dark energy theory develops a Big Rip singularity. A number of explicit examples are presented which show that these two theories are not completely equivalent, from the physical viewpoint. This basically owes to the fact that the physical metric in both theories differ in a time-dependent conformal factor. As a result, an FRW accelerating solution, or FRW instanton, in the scalar-tensor theory may look as a deccelerating FRW solution, or a non-instantonic one, in the corresponding modified gravity theory.
Briscese Fabio
Elizalde Emilio
Nojiri Shin'ich
Odintsov Sergei D.
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