Abstract
The various measurements of the linear matter density perturbation amplitude obtained from the observations of the cosmic microwave background (CMB) anisotropy, weak gravitational lensing, galaxy cluster mass function, matter power spectrum, and redshift space distortions are compared. The Planck data on the CMB temperature anisotropy spectrum at high multipoles, ℓ > 1000 (where the effect of gravitational lensing is most significant), are shown to give a measurement of the matter density perturbation amplitude that contradicts all other measurements of this quantity from both Planck CMB anisotropy data and other data at a significance level of about 3.7σ. Thus, at present these data should not be combined together for the calculations of constraints on cosmological parameters. Except for the Planck data on the CMB temperature anisotropy spectrum at high multipoles, all the remaining measurements of the density perturbation amplitude agree well between themselves and give the following constraints: σ8 = 0.792± 0.006 on the linear matter density perturbation amplitude, Ωm = 0.287± 0.007 on the matter density parameter, and H0 = 69.4 ± 0.6 km s−1 Mpc−1 on the Hubble constant. Various constraints on the sum of neutrino masses and the number of neutrino flavors can be obtained by additionally taking into account the data on baryon acoustic oscillations and (or) direct Hubble constant measurements in the local Universe.
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Original Russian Text © R.A. Burenin, 2018, published in Pis’ma v Astronomicheskii Zhurnal, 2018, Vol. 44, No. 11, pp. 715–726.
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Burenin, R.A. Measurements of the Matter Density Perturbation Amplitude from Cosmological Data. Astron. Lett. 44, 653–663 (2018). https://doi.org/10.1134/S1063773718110038
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DOI: https://doi.org/10.1134/S1063773718110038