Formation of galaxies in a gravitino-dominated universe

Details Formation of galaxies in a gravitino-dominated universe Formation of galaxies in a gravitino-dominated universe

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phrvl..48.1636b&link_type=abstract

Physical Review Letters, vol. 48, June 7, 1982, p. 1636-1639.

Physics

84

Galactic Clusters, Galactic Evolution, Gravitinos, Gravitons, Particle Mass, Universe, Dark Matter, Galactic Structure, Neutrinos, Perturbation Theory, Space Density

Scientific paper

If gravitinos of mass 1 keV (or similar particles) dominate the mass of the universe, a critical scale of galactic size arises due to their collisionless phase mixing. It is shown that density perturbation spectrum of gravitinos is relatively flat between galactic and cluster scales, unlike the massive neutrino case. If gravitinos form the dark matter, initial adiabatic fluctuations lead to a hierarchical picture of clustering. Galaxies form first, but dissipation is necessary for their survival.

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