Spherically symmetric cosmological perturbations in the de Donder gauge (2): The evolution during the radiation and dust periods

Details Spherically symmetric cosmological perturbations in the de Donder gauge (2): The evolution during the radiation and dust periods Spherically symmetric cosmological perturbations in the de Donder gauge (2): The evolution during the radiation and dust periods

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.219..171i&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 219, no. 2, p. 171-181

Astronomy and Astrophysics

Astrophysics

3

Astronomical Models, Background Radiation, Cosmic Dust, Cosmology, Galactic Evolution, Gauge Theory, Perturbation, Symmetry, Universe, Equations Of State, Flux Density, Hubble Constant, Tensor Analysis

Scientific paper

In the framework of a previously developed procedure the evolution of small spherically symmetric perturbations in a homogeneous R-W-F universe is analyzed. It turns out that the evolution tendency is mainly predicted by the state of the cosmic background. In the radiation dominated period the universe does not stimulate growing processes, a perturbation 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 were formed at the beginning of the dust dominated era.

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