Large-scale anisotropy of the cosmic microwave background radiation

Details Large-scale anisotropy of the cosmic microwave background radiation Large-scale anisotropy of the cosmic microwave background radiation

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244l..37s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 244, Mar. 1, 1981, p. L37-L41.

Physics

52

Anisotropy, Background Radiation, Cosmic Rays, Cosmology, Extraterrestrial Radiation, Microwaves, Galactic Evolution, Matter (Physics), Quadrupoles, Universe

Scientific paper

Inhomogeneities in the large-scale distribution of matter inevitably lead to the generation of large-scale anisotropy in the cosmic background radiation. The dipole, quadrupole, and higher order fluctuations expected in an Einstein-de Sitter cosmological model have been computed. The dipole and quadrupole anisotropies are comparable to the measured values, and impose important constraints on the allowable spectrum of large-scale matter density fluctuations. A significant dipole anisotropy is generated by the matter distribution on scales greater than approximately 100 Mpc. The large-scale anisotropy is insensitive to the ionization history of the universe since decoupling, and cannot easily be reconciled with a galaxy formation theory that is based on primordial adiabatic density fluctuations.

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