Cold Dark Matter Models with a Cosmological Constant

Details Cold Dark Matter Models with a Cosmological Constant Cold Dark Matter Models with a Cosmological Constant

1995-12-15

arxiv.org/abs/astro-ph/9512102v3

Mon.Not.Roy.Astron.Soc.282:281,1996

Astronomy and Astrophysics

Astrophysics

11 pages LaTeX file with two figures incorporated (uses mn.sty and epsf). Also available by e-mailing ARL, or by WWW at http

Scientific paper

We use linear and quasi-linear perturbation theory to analyse cold dark matter models of structure formation in spatially flat models with a cosmological constant. Both a tilted spectrum of density perturbations and a significant gravitational wave contribution to the microwave anisotropy are allowed as possibilities. We provide normalizations of the models to microwave anisotropies, as given by the four-year {\it COBE} observations, and show how all the normalization information for such models, including tilt, can be condensed into a single fitting function which is independent of the value of the Hubble parameter. We then discuss a wide variety of other types of observations. We find that a very wide parameter space is available for these models, provided $\Omega_0$ is greater than about 0.3, and that large-scale structure observations show no preference for any particular value of $\Omega_0$ in the range 0.3 to 1.

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