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Prog. Theor. Phys. Vol. 40 No. 4 (1968) pp. 781-795

Observable Horizons in the Expanding Universe

Humitaka Satō

Department of Physics, Kyoto University, Kyoto

(Received May 13, 1968)

Abstract:

Considering the absorption of extragalactic radiation in an expanding medium, we investigated observable limits of distances, i.e. observable horizons. For each of various radiations, the universe was cloudy in the early stage filled with a dense absorbing medium, and it was thereafter cleared up at some critical time t_c. Photons emitted at t_c suffer the reddening, being expressed in terms of red-shift parameter z; z+1=10^1.6∼10^3.1 for γ-rays, 10^0.9∼10^2.3 for X-rays and 10^0.9 ∼10³ for thermal photons corresponding to the Friedmann universe model with the present matter density ρ_m0=10^-29∼10^-32 g/cm³.
As the cosmic black-body radiation is a relict radiation emitted from matter at the observable horizon, it may carry the information on the strucure in the early period of 10⁵∼10⁷ years since the birth of the universe. From this point, an inhomogeneous distribution of this radiation with the angular size of 10'∼1'' is likely to take place conserning the galaxy formation.

URL : http://ptp.ipap.jp/link?PTP/40/781/
DOI : 10.1143/PTP.40.781

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Citing Article(s) :

1. Progress of Theoretical Physics Vol. 47 No. 2 (1972) pp. 416-443 :

   Non-Linear Theory of Gravitational Instability in the Expanding Universe. III

   Kenji Tomita

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