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Prog. Theor. Phys. Vol. 79 No. 6 (1988) pp. 1345-1364

Clustering of Galaxies and Clusters of Galaxies in a Decaying-Particle Cosmological Model with a Massive Decay Product

Kenji Tomita

Research Institute for Theoretical Physics, Hiroshima University, Takehara, Hiroshima 725

(Received January 14, 1988)

Abstract:

On the basis of a decaying-particle cosmological model with a massive decay product whose present Jeans wavelength is ∼30 h^-1Mpc (the Hubble constant H₀ = 100 h km s^-1Mpc^-1), we study the correlation functions and velocity distributions of galaxies and clusters of galaxies using the direct method of N body simulation for these objects and the simple difference method for the dark matter fluid consisting of the decay product. It is assumed that the power index N_s of the power spectrum of the initial density perturbations is 0, -1 and -2, the redshift z_d corresponding to the decay time is 2 ∼3 and the present density parameter Ω_d0 for the decay product is 0.8 ∼0.9. The dark matter fluid prevents galaxies from clustering in the small-scale and helps clusters of galaxies clustering in the large-scale. Owing to this role of the dark matter fluid, models in the case N_s = 0 ∼-1, Ω_d0 = 0.8 ∼0.9 and z_d = 2.0 ∼3.0 are found to be consistent with the observational results on the correlation functions and velocity distributions.

URL : http://ptp.ipap.jp/link?PTP/79/1345/
DOI : 10.1143/PTP.79.1345

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Citing Article(s) :

1. Progress of Theoretical Physics Vol. 82 No. 3 (1989) pp. 563-580 :

   Gravitational Lens Effect on the Cosmic Background Radiation Due to Nonlinear Inhomogeneities

   Kenji Tomita and Kazuya Watanabe

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