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Phantom scalar dark energy as modified gravity: understanding the origin of the Big Rip singularity
- Publication Year :
- 2006
- Publisher :
- arXiv, 2006.
-
Abstract
- 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.<br />Comment: LaTeX file, 9 pages. Some references are added. The version to appear in Physcs Letters B
- Subjects :
- High Energy Physics - Theory
Physics
Nuclear and High Energy Physics
Gravity (chemistry)
Astrophysics (astro-ph)
Scalar (physics)
Big Rip
FOS: Physical sciences
Scalar potential
General Relativity and Quantum Cosmology (gr-qc)
Astrophysics
General Relativity and Quantum Cosmology
Scalar–tensor theory
Singularity
High Energy Physics - Theory (hep-th)
Dark energy
f(R) gravity
Mathematical physics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....80fc2f53b1cc7e561d951f032fbcc974
- Full Text :
- https://doi.org/10.48550/arxiv.hep-th/0612220