Chaplygin gas in decelerating DGP gravity and the age of the oldest star

Details Chaplygin gas in decelerating DGP gravity and the age of the oldest star Chaplygin gas in decelerating DGP gravity and the age of the oldest star

2008-05-27

arxiv.org/abs/0805.4113v1

Phys.Lett.B666:420-424,2008

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures

Scientific paper

10.1016/j.physletb.2008.07.094

Accelerating Chaplygin gas combined with the decelerating braneworld Dvali-Gabadadze-Porrati (DGP) model can produce an overall accelerated expansion of the order of magnitude seen. Both models have similar asymptotic properties at early and late cosmic times, and are characterized by a length scale. Taking the length scales to be proportional one obtains a combined model with three free parameters, one more than the LCDM model, which fits supernovae data equally well. We further constrain it by the CMB shift parameter, and by requiring that the model yields a longer age of the Universe than that of the oldest star HE 1523-0901, t * = 13.4\pm 0.8(stat)\pm 1.8(syst). In contrast to generalized DGP and Chaplygin gas models, this is a genuine alternative to the cosmological constant model because it does not reduce to it in any limit of the parameter space.

Affiliated with

Also associated with

No associations

Rating

Chaplygin gas in decelerating DGP gravity and the age of the oldest star 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 Chaplygin gas in decelerating DGP gravity and the age of the oldest star, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chaplygin gas in decelerating DGP gravity and the age of the oldest star will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-273607