Affine equation of state from quintessence and k-essence fields

Details Affine equation of state from quintessence and k-essence fields Affine equation of state from quintessence and k-essence fields

2007-06-25

arxiv.org/abs/0706.3667v2

Class.Quant.Grav.24:5413-5426,2007

Astronomy and Astrophysics

Astrophysics

9 pages, 6 figures. Minor updates, accepted by CQG

Scientific paper

10.1088/0264-9381/24/22/006

We explore the possibility that a scalar field with appropriate Lagrangian can mimic a perfect fluid with an affine barotropic equation of state. The latter can be thought of as a generic cosmological dark component evolving as an effective cosmological constant plus a generalized dark matter. As such, it can be used as a simple, phenomenological model for either dark energy or unified dark matter. Furthermore, it can approximate (up to first order in the energy density) any barotropic dark fluid with arbitrary equation of state. We find that two kinds of Lagrangian for the scalar field can reproduce the desired behaviour: a quintessence-like with a hyperbolic potential, or a purely kinetic k-essence one. We discuss the behaviour of these two classes of models from the point of view of the cosmological background, and we give some hints on their possible clustering properties.

Affiliated with

Also associated with

No associations

Rating

Affine equation of state from quintessence and k-essence fields 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 Affine equation of state from quintessence and k-essence fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Affine equation of state from quintessence and k-essence fields will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-230474