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Title:
Mixed Cold-Hot Dark Matter Model with Falling and Quasi-flat Initial Perturbation Spectra
Authors:
Pogosyan, Dmitri Yu.; Starobinsky, Alexei A.
Publication:
Astrophysical Journal v.447, p.465 (ApJ Homepage)
Publication Date:
07/1995
Origin:
APJ; KNUDSEN
Astronomy Keywords:
COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE, COSMOLOGY: DARK MATTER, COSMOLOGY: OBSERVATIONS, COSMOLOGY: THEORY
DOI:
10.1086/175890
Bibliographic Code:
1995ApJ...447..465P

Abstract

The mixed cold-hot dark matter cosmological model (CHDM) withOmega tot = 1 and a falling power-law initial spectrum of Gaussian adiabatic perturbations (n > 1) is tested using recent observational data. It is shown that its fit to the data becomes worse with the growth of n-1 and may be considered as unreasonable for n> 1.1 for all possible values of the Hubble constant. Thus, the CHDM model with a falling initial spectrum is worse than the same model with the approximately flat (|n-1| <0.1) spectrum. On the other hand, the CHDM model provides a rather good fit to the data if n lies in the range (0.9-1.0), the Hubble constant H0 < 60 km s-1 Mpc-1 (H0 < 55 for n = 1) and the neutrino energy density Omega < 0.25. So, the CHDM model offers the best possibility for the realization of the simplest variants of the inflationary scenario having the effective slope n ≈ (0.95-0.97) between galaxy and horizon scales, including a modest contribution of primordial gravitational wave background to large-angle DeltaT/T fluctuations of the cosmic microwave background (resulting in the increase of their total rms amplitude by 5%-10% expected in some variants). A classification of cosmological models according to the number of fundamental parameters used to fit observational data is presented, too.

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