Cosmic background radiation anisotropies in universes dominated by nonbaryonic dark matter

Details Cosmic background radiation anisotropies in universes dominated by nonbaryonic dark matter Cosmic background radiation anisotropies in universes dominated by nonbaryonic dark matter

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285l..45b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. L45-L48. Research supported

Astronomy and Astrophysics

Astrophysics

651

Background Radiation, Big Bang Cosmology, Dark Matter, Elementary Particle Interactions, Galactic Evolution, Mass To Light Ratios, Relic Radiation, Anisotropy, Brightness Temperature, Galactic Clusters, Linear Polarization, Mass Distribution, Neutrinos

Scientific paper

Detailed calculations of the temperature fluctuations in the cosmic background radiation for universes dominated by massive collisionless relics of the big bang are presented. An initially adiabatic constant curvature perturbation spectrum is assumed. In models with cold dark matter, the simplest hypothesis - that galaxies follow the mass distribution leads to small-scale anisotropies which exceed current observational limits if omega is less than 0.2 h to the -4/3. Since low values of omega are indicated by dynamical studies of galaxy clustering, cold particle models in which light traces mass are probably incorrect. Reheating of the pregalactic medium is unlikely to modify this conclusion. In cold particle or neutrino-dominated universes with omega = 1, presented predictions for small-scale and quadrupole anisotropies are below current limits. In all cases, the small-scale fluctuations are predicted to be about 10 percent linearly polarized.

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