1994/09/28 by D. Pogosyan, Dmitri Pogosyan, Alexei A. Starobinsky +1 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Geophysics and Gravity Measurements #astro-ph
paper · pdf · doi:10.1086/175890
published as Astrophys.J. 447 (1995) 465 · 18 pages, LaTeX file, YITP/U-94-26, postscript figures on request
arxiv created 1994/09/28 · openalex publication_date 1995/07/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The mixed cold-hot dark matter cosmological model (CHDM) withΩ <SUB>tot</SUB> = 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 H<SUB>0</SUB> < 60 km s<SUP>-1</SUP> Mpc<SUP>-1</SUP> (H<SUB>0</SUB> < 55 for n = 1) and the neutrino energy density Ω < 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 ΔT/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.