Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-08-26
Eur. Phys. J. C (2011) 71:1660
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
11 pages, 5 figs, v3: several references added, to match the published version
Scientific paper
10.1140/epjc/s10052-011-1660-z
Recently, type Ia supernovae data appear to support a dark energy whose equation of state $w$ crosses -1, which is a much more amazing problem than the acceleration of the universe. We show that it is possible for the equation of state to cross the phantom divide by a scalar field in the gravity with an additional inverse power-law term of Ricci scalar in the Lagrangian. The necessary and sufficient condition for a universe in which the dark energy can cross the phantom divide is obtained. Some analytical solutions with $w<-1$ or $w>-1$ are obtained. A minimal coupled scalar with different potentials, including quadratic, cubic, quantic, exponential and logarithmic potentials are investigated via numerical methods, respectively. All these potentials lead to the crossing behavior. We show that it is a robust result which is hardly dependent on the concrete form of the potential of the scalar.
Du Yunshuang
Li Xin-zhou
Zhang Hongsheng
No associations
LandOfFree
New mechanism to cross the phantom divide does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New mechanism to cross the phantom divide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New mechanism to cross the phantom divide will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-703607