Matter creation and primordial CMB spectrum in the inflationless Milne-like cosmologies
The primordial spectrum of scalar particle's density perturbations is calculated. On the assumption of spectrum universality, i.e., a mean energy density and a typical value of inhomogeneity can be chosen arbitrarily, the form of the spectrum turns out to be completely defined. It is close to the flat Harrison - Zeldovich spectrum, but with the suppression of low-frequency modes.