Can graininess in the early universe make galaxies?

Details Can graininess in the early universe make galaxies? Can graininess in the early universe make galaxies?

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268....1c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 1-16.

Mathematics

Probability

29

Big Bang Cosmology, Density Wave Model, Elementary Particle Interactions, Galactic Clusters, Galactic Evolution, Baryons, Broken Symmetry, Correlation, Fluctuation Theory, Gauge Theory, Particle Mass, Particle Motion, Phase Transformations, Photon Density, Random Processes, Unified Field Theory

Scientific paper

An explanation is presented for the formation of galaxies and galaxy clusters from density fluctuation arising spontaneously in an initially Friedmann universe as a result of statistical effects associated with the universe developing nonlinear lumps. It is argued that the fluctuations derive from the universe's becoming 'grainy' at some epoch as a result of its undergoing some sort of phase transition. Two kinds of fluctuation may be generated by grain formation, one associated with the fact that the probability of grains forming in regions which are not causally connected should be uncorrelated, the other with the fact that grains must develop peculiar velocities through nonlinear effects. An acausal scenario involving grains sprinkled in Poisson fashion is also considered. Factors that could permit grains to be much larger than the usual Friedmann particle horizon size at formation are discussed in the context of hot and cold Big Bang models.

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