  The inhomogeneous cosmological model with matter in the form self-acting
scalar field and perfect fluid is considered. On the basis of exact solutions
is considered the evolution of density distribution of a matter in space on a
background cosmological expansion by the Universe. Is shown, the first, in such
model the equation of a matter state is variable in time and is closely
connected to character cosmological expansions. Secondly, it is shown with
point of view of the observer the Universe looks as space flat, but with effect
of latent mass. This effect consists in that the mass of a perfect fluid by
dynamic measurements surpasses the own mass perfect fluid that is explained by
presence scalar field (20K).
