Gravitational optical scintillation and anisotropy of the cosmic microwave background

Details Gravitational optical scintillation and anisotropy of the cosmic microwave background Gravitational optical scintillation and anisotropy of the cosmic microwave background

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..385f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. 385-395.

Astronomy and Astrophysics

Astrophysics

3

Background Radiation, Cosmic Rays, Gravitational Lenses, Microwaves, Scintillation, Cosmology, Spatial Distribution

Scientific paper

It is proposed that the stochastic component of matter distribution in the universe may cause the apparent intensity fluctuation of radiation sources at cosmological distances. The anisotropy correlation function of light intensity fluctuation is obtained and applied to study the temperature pattern of cosmic background radiation. The gravitational optical scintillation is found to significantly contribute to the anisotropy of cosmic background radiation (CBR) temperature fluctuation after the decoupling era, and to dominate on a scale of arcmin. It is shown that hot dark matter, adiabatic or isocurvature cold dark matter, and baryonic models with Omega = 1 are incompatible with the upper limit of CBR anisotropy given by recent observations. It is concluded that in the flat Einstein-de Sitter universe predicted strongly by the inflationary scenario, the luminous and underlying dark matter might have different distributions, namely, the luminous objects are inhomogeneous as observed today, while the dark matter has a smooth density distribution.

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