| DATE: |
2009-07-10 14:00 - 15:00 |
| PLACE: |
Kenkyu Honkan 2F RM 220 |
| TITLE: |
Phantom crossing in F(R) gravity |
| CONTACT: |
ISHIBASHI, Akihiro/akihiro.ishibashi AT kek.jp |
| SPEAKER: |
Dr. Kazuharu Bamba (Taiwan Natl.Tsing Hua U) |
| ABSTRACT: |
A scenario to explain the current accelerated expansion of the universe is to study a modified gravitational theory, such as F(R) gravity, in which the action is described by an arbitrary function F(R) of the scalar curvature R. On the other hand, various observational data imply that the ratio of the effective pressure to the effective energy densityof the universe, i.e., the effective equation of state (EoS), may evolve from larger than -1 (non-phantom phase) to less than -1 (phantom phase). Namely, it crosses (or crossed) -1 (the phantom divide) at the present time (or in near past/future). In this presentation, we reconstruct an explicit model of F(R) gravity with realizing a crossing of the phantom divide.
Reference: Phys. Rev. D 79, 083014 (2009) [arXiv:0810.4296] |
|
