Origin and evolution of the large-scale structure of the universe

Details Origin and evolution of the large-scale structure of the universe Origin and evolution of the large-scale structure of the universe

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cajph..68..799s&link_type=abstract

Canadian Journal of Physics (ISSN 0008-4204), vol. 68, Sept. 1990, p. 799-804; Discussion, p. 804-807.

Physics

Big Bang Cosmology, Relic Radiation, Universe, Galactic Clusters, Galactic Evolution, Voids

Scientific paper

Ever since the epoch of the spontaneous breaking of grand unification symmetry between the nuclear and electromagnetic interactions, the universe has expanded under the imprint of a spectrum of density fluctuations that is generally considered to have originated in this phase transition. Various possibilities for the form of the primordial fluctuation spectrum, spanning the range of adiabatic fluctuations, isocurvature fluctuations, and cosmic strings are here considered. Growth of the seed fluctuations by gravitational instability generates the formation of large-scale structures, from the scale of galaxies to that of clusters and superclusters of galaxies. The large-scale distribution of the galaxies, including the apparent voids, sheets and filaments, and the coherent peculiar velocity field on scales of several tens of megaparsecs, probe the primordial fluctuation spectrum on scales that are only mildly nonlinear. Even larger scales are probed by study of the anisotropy of the cosmic microwave background radiation, which provides a direct glimpse of the primoridal fluctuations that existed about one million years or so after the initial big bang singularity. Galaxy formation is the process by which the building blocks of the universe have formed, involving a complex interaction between hydrodynamical and dynamical processes in a collapsing gas cloud.

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