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Prog. Theor. Phys. Vol. 78 No. 1 (1987) pp. 105-113

Decaying-Particle Universe Models with Nonzero Cosmological Constant and the Galactic Number Count Observation

Kenji Tomita and Naoshi Sugiyama

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

(Received March 9, 1987)

Abstract:

Decaying-particle universe models with nonzero cosmological constant Λ are considered in connection with the recent observational [Galaxy number count N-redshift z] relation and it is shown that the best-fitted values of Λ and the density parameter Ω₀ depend on the decay time t_d: For H₀t_d=0.05, we get Ω₀=0.494 and Λc²/(3H₀²)=-0.046. If the model is required to be flat, the fitted values are Ω₀=0.689 and Λc²/(3H₀²)=0.311 for H₀t_d=0.05. The cosmic ages are found to be of the order of or larger than 0.6/H₀ in the fitted models. Moreover the nonlinear growth of the density perturbations is considered and the evolution of the baryon density is examined in several fitted models.

URL : http://ptp.ipap.jp/link?PTP/78/105/
DOI : 10.1143/PTP.78.105

[ Full Text PDF : FREE ACCESS (448K) ] Citation: Plain Text BiBTeX EndNote(RIS) RSS

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Citing Article(s) :

1. Progress of Theoretical Physics Vol. 78 No. 6 (1987) pp. 1288-1299 :

   The Dipole Anisotropy in the Decaying-Particle Universe Models with Nonzero Cosmological Constant

   Kenji Tomita and Naoshi Sugiyama

2. Progress of Theoretical Physics 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

3. Progress of Theoretical Physics Vol. 84 No. 5 (1990) pp. 892-898 :

   Observational Relations in Model Universes Dominated by Negative-Pressure Matter

   Kenji Tomita and Kazuya Watanabe

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