Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-24
Astronomy and Astrophysics
Astrophysics
14 pages, 15 color figures in one file rad; revision added refs for figure 1 revision, symbols replace "sun" in figures
Scientific paper
A Big Bang universe consisting, before recombination, of H, D, 3He, 4He, 6Li, and 7Li ions, electrons, photons, and massless neutrinos, at closure density, with a galaxy-size perturbation spectrum but no large-scale structure, will evolve into the universe as we now observe it. Evolution during the first billion years is controlled by radiation. Globular clusters are formed by radiatively-driven implosions, galaxies are formed by radiatively triggered gravitational collapse of systems of globular clusters, and voids are formed by radiatively-driven expansion. After this period the strong radiation sources are exhausted and the universe has expanded to the point where further evolution is determined by gravity and universal expansion.
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