BEST-FIT COSMOLOGICAL PARAMETERS FROM OBSERVATIONS OF THE LARGE SCALE STRUCTURE OF THE UNIVERSE

B. Novosyadlyj, S. Apunevych, R. Durrer, S. Gottloeber, V. Lukash

Анотація


The possibility to determine cosmological parameters on the basis of a wide set of observational data including the Abell-ACO cluster power spectrum and mass function, peculiar velocities of galaxies, the distribution of Ly-α clouds and CMB temperature fluctuations is analyzed. Assuming a flat universe,
ΩΛ + Ωm= 1, with purely scalar perturbations, we show that a χ2 minimization method applied on this data set determines quite precisely the values of the spectral index n of the primordial power spectrum, the baryon and massive neutrino density Ω b and Ω v respectively, the Hubble constant h ≡ H0/(100km / s / Mpc) and the value of the cosmological constant, ΩΛ. Varying all parameters we find that a tilted ΛMDM model with one species of massive neutrinos and the parameters n = 1.13 ± 0.10, Ωm = 0.41 ± 0.11,
Ω v = 0.06 ± 0.028, Ωb = 0.039 ± 0.014 and h = 0.70 ± 0.12 matches the observational data best.

Ключові слова


Cosmology; theory; large scale structure of the Universe; dark matter; galaxies; clustering.

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Посилання


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DOI: https://doi.org/10.18524/1810-4215.1999.12.93104

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