SPHERICALLY SYMMETRICAL COSMOLOGICAL PERTURBATIONS IN THE DEDONDER GAUGE .2. THE EVOLUTION DURING THE RADIATION AND DUST PERIODS

In the framework of a previously developed procedure the evolution of small spherically symmetric perturbations in a homogeneous R-W-F unive rse is analyzed. It turns out that the evolution tendency is mainly pr edicted by the state of the cosmic background. In the radiation domina ted period the universe does not stimulate growing processes, a pertur bation will be in a frozen state or it will diffuse. It is found that a dust dominated universe stimulates the perturbation masses to grow. The rate of this cosmic affected growing process is proportional to (R )(-1/2) (R being the scale factor). Consequently almost all galaxies w ere formed at the beginning of the dust dominated era.