Generalizing the generalized Chaplygin gas

Details Generalizing the generalized Chaplygin gas Generalizing the generalized Chaplygin gas

2005-07-29

arxiv.org/abs/astro-ph/0507717v2

Phys.Rev. D72 (2005) 063511

Astronomy and Astrophysics

Astrophysics

8 pages, 9 figures, references added, to appear in Phys. Rev. D

Scientific paper

The generalized Chaplygin gas is characterized by the equation of state p = - A/rho^alpha, with alpha > -1 and w > -1. We generalize this model to allow for the cases where alpha < -1 or w < -1. This generalization leads to three new versions of the generalized Chaplygin gas: an early phantom model in which w << -1 at early times and asymptotically approaches w = -1 at late times, a late phantom model with w \approx -1 at early times and w -> - \infty at late times, and a transient model with w \approx -1 at early times and w -> 0 at late times. We consider these three cases as models for dark energy alone and examine constraints from type Ia supernovae and from the subhorizon growth of density perturbations. The transient Chaplygin gas model provides a possible mechanism to allow for a currently accelerating universe without a future horizon, while some of the early phantom models produce w < -1 without either past or future singularities.

Affiliated with

Also associated with

No associations

Rating

Generalizing the generalized Chaplygin gas 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 Generalizing the generalized Chaplygin gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Generalizing the generalized Chaplygin gas will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-562198