Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232....7r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 1, June 1990, p. 7-15. Research supported by DOE and NASA.
Astronomy and Astrophysics
Astrophysics
3
Cosmology, Dark Matter, Fragmentation, Galactic Clusters, Universe, Astronomical Models, Jeans Theory, Perturbation Theory, Space Density
Scientific paper
The spectrum of cosmological perturbations which may give origin to a cellular observer-homogeneous self similar structure in the universe, is examined. It is assumed that this structure ogiginates by successive fragmentations in the dark matter 'ino' component, due to a process of Jeans instability. The fragmentation is characterized by the number of fragments (N) occurring at each step and by a characteristic 'lagging time factor' (tau) at each successive fragmentation. In order to fulfill the observed spectrum of perturbations, at the present epoch, suitable values of tau are defined, the process is quite independent on the value of N. The initial spectrum of density perturbations is found to have a flat spectrum in mass with an upper and lower cutoff. The initial amplitudes of the perturbations, as well as the ones to be found at the era of decoupling between matter and radiation, are discussed.
Ruffini Remo
Song Doo Jong
Taraglio S.
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