CDM models with a smooth component
Abstract
The inflationary prediction of a flat Universe is at odds with current determinations of the matter density (ΩM~=0.2-0.4). This dilemma can be resolved if a smooth component contributes the remaining energy density (ΩX=1-ΩM). We parametrize the smooth component by its equation of state, pX=wρX, and show that XCDM with w~=-0.6, ΩM~=0.3, and h~=0.7 is the best fit to all present cosmological data. Together, the position of the peak in the CMB angular power spectrum and the type Ia supernova magnitude-redshift diagram provide a crucial test of XCDM.
- Publication:
-
Physical Review D
- Pub Date:
- October 1997
- DOI:
- arXiv:
- arXiv:astro-ph/9701138
- Bibcode:
- 1997PhRvD..56.4439T
- Keywords:
-
- 98.80.Cq;
- 95.35.+d;
- 98.65.Dx;
- 98.80.Es;
- Particle-theory and field-theory models of the early Universe;
- Dark matter;
- Superclusters;
- large-scale structure of the Universe;
- Observational cosmology;
- Astrophysics
- E-Print:
- 5 pages, RevTeX, with 5 postscript figures included. Minor modifications to reflect version accepted by Phys. Rev. D