Classification of multifluid CP world models

Details Classification of multifluid CP world models Classification of multifluid CP world models

2000-12-20

arxiv.org/abs/astro-ph/0012437v1

A&A 366, 395-406

Astronomy and Astrophysics

Astrophysics

12 pages, 11 figures, latex, A&A in press

Scientific paper

10.1051/0004-6361:20000103

Various classification schemes exist for homogeneous and isotropic (CP) world models, which include pressureless matter (so-called dust) and Einstein's cosmological constant Lambda. We here classify the solutions of more general world models consisting of up to four non-interacting fluids, each with pressure P, energy density epsilon and an equation of state P = (gamma - 1) epsilon with 0 <= gamma <= 2. In addition to repulsive fluids with negative pressure and positive energy density, which generalize the classical repulsive (positive) Lambda component, we consider fluids with negative energy density as well. The latter generalize a negative Lambda component. This renders possible new types of models that do not occur among the classical classifications of world models. Singularity-free periodic solutions as well as further `hill-type', `hollow-type' and `shifting-type' models are feasible. However, if one only allows for three components (dust, radiation and one repulsive component) in a spatially flat universe the repulsive classical Lambda fluid (with Lambda > 0) tends to yield the smoothest fits of the Supernova Ia data from Perlmutter et al. (1999). Adopting the SN Ia constraints, exotic negative energy density components can be fittingly included only if the universe consists of four or more fluids.

Affiliated with

Also associated with

No associations

Rating

Classification of multifluid CP world models 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 Classification of multifluid CP world models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Classification of multifluid CP world models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-374323