Observable Horizons in the Expanding Universe

概要

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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>~10^3 for thermal photons corresponding to the Friedmann universe model with the present matter density p_<m0>=10^<-29>~10^<-32>g/cm^3. As the cosmic black-body radiation is a relict radiation emitted from matter at the observable horizon, it may carry the information on the structure in the early period of 10^5~10^7 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 concerning the galaxy formation.
理論物理学刊行会の論文
1968-10-25