The Cosmic X-ray background carries the information of cosmic accretion onto super-massive black holes. The intensity at its peak can be used to constrain the integrated space density of highly obscured AGNs. Determining the shape and intensity of the Cosmic X-ray background radiation represents, however, a first step towards the understanding of the population of Comptonthick AGNs. The study o...

We discuss the implications of the Calogero hypothesis on the \cosmic origin of quantization" 1], and of the variation of h with time it implies, for cosmology. We focus on two issues: (a) how the relation between redshift and distance would be modiied; and (b) how the observations on the cosmic background radiation, and the estimation they give of the time elapsed since its production, would b...

The model of quantum universe as a cosmological system in quasistationary state is considered. It is shown that in proposed approach the difficulties of the standard Big-bang cosmology do not arise. The theory predicts the observed dimensions of the nonhomogeneities of matter density and the amplitude of the fluctuations of the cosmic background radiation temperature in the Universe and points ...