Crossing the phantom divide

Details Crossing the phantom divide Crossing the phantom divide

2009-09-16

arxiv.org/abs/0909.3013v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

42 pages, 17 figs, invited review for Nova Science Publisher, as a chapter of the book Dark Energy: Theories, Developments and

Scientific paper

The cosmic acceleration is one of the most significant cosmological discoveries over the last century. Following the more accurate data a more dramatic result appears: the recent analysis of the observation data (especially from SNe Ia) indicate that the time varying dark energy gives a better fit than a cosmological constant, and in particular, the equation of state parameter $w$ (defined as the ratio of pressure to energy density) crosses -1 at some low redshift region. This crossing behavior is a serious challenge to fundamental physics. In this article, we review a number of approaches which try to explain this remarkable crossing behavior. First we show the key observations which imply the crossing behavior. And then we concentrate on the theoretical progresses on the dark energy models which can realize the crossing -1 phenomenon. We discuss three kinds of dark energy models: 1. two-field models (quintom-like), 2. interacting models (dark energy interacts with dark matter), and 3. the models in frame of modified gravity theory (concentrating on brane world).

Affiliated with

Also associated with

No associations

Rating

Crossing 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 Crossing the phantom divide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crossing the phantom divide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-583183