Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy

Details Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy

2008-08-22

arxiv.org/abs/0808.3125v2

Phys.Rev.D78:087303,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, code available at http://camb.info/ppf, minor revisions reflect PRD published version

Scientific paper

10.1103/PhysRevD.78.087303

Dark energy models with a single scalar field cannot cross the equation of state divide set by a cosmological constant. More general models that allow crossing require additional degrees of freedom to ensure gravitational stability. We show that a parameterized post-Friedmann description of cosmic acceleration provides a simple but accurate description of multiple scalar field crossing models. Moreover the prescription provides a well controlled approximation for a wide range of "smooth" dark energy models. It conserves energy and momentum and is exact in the metric evolution on scales well above and below the transition scale to relative smoothness. Standard linear perturbation tools have been altered to include this description and made publicly available for studies of the dark energy involving cosmological structure out to the horizon scale.

Affiliated with

Also associated with

No associations

Rating

Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy 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 Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-186046