Omega from the skewness of the cosmic velocity divergence
نویسندگان
چکیده
منابع مشابه
Omega from the Skewness of the Cosmic Velocity Divergence
We propose a method for measuring the cosmological density parameter from the statistics of the expansion scalar, H 1 r v, { the divergence of peculiar velocity, expressed in units of the Hubble constant, H 100h km s 1 Mpc 1 . The velocity eld is spatially smoothed over 10h 1 Mpc to remove strongly nonlinear e ects. Assuming weakly-nonlinear gravitational evolution from Gaussian initial uctuati...
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We compute the skewness t3 and the corresponding hierarchical amplitude T3 of the divergence of the velocity field for arbitrary non-Gaussian initial conditions. We find that T3 qualitatively resembles the corresponding hierarchical amplitude for the density field, S3, in that it contains a term proportional to the initial skewness, which decays inversely as the linear growth factor, plus a con...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1995
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/274.1.20