Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-07-10
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
17 pages
Scientific paper
Here Randall-Sundrum brane-gravity models of the homogeneous and flat universe, dominated by phantom fluid, is considered. It is noted that brane-gravity corrections effect the behaviour of phantom fluid in RS-II model (where brane-tension $\lambda$ is negative) drastically. It is interesting to see that, phantom fluid violates the weak energy condition (WEC) till energy density $\rho < \lambda$, but when phantom energy density $\rho$ grows more, the effective equation of state does not violate WEC. Moreover, with increasing phantom energy density, a stage comes when even strong energy condition is not violated due to effect of these corrections. Also expansion stops, when $\rho = 2 \lambda$. As a consequence, RS-II phantom universe accelerates upto a finite time explaining the present cosmic acceleration, but it decelerates later.Thus, RS-II phantom universe is singularity-free. In the case of RS-I model, where $\lambda$ is positive, characteristics of phantom fluid is not suppressed by brane-corrections and phantom universe accelerates ending up in big-rip singularity in finite future time.
No associations
LandOfFree
Can Phantom-Dominated Universe Decelerate Also in Future ? 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 Can Phantom-Dominated Universe Decelerate Also in Future ?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Can Phantom-Dominated Universe Decelerate Also in Future ? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-453392