Physics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162....5m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 5-12.
Physics
6
Background Radiation, Microwaves, Polarization Characteristics, Anisotropy, Baryons, Cosmic Background Explorer Satellite, Dark Matter, Matter (Physics), Numerical Integration, Red Shift
Scientific paper
The origins of an observed small scale polarization of the cosmic microwave background are discussed analytically. The working assumption is that polarization can ultimately be attributed to adiabatic density perturbations caused by dark matter in the universe. The ratio of the polarization and radiation anisotropy (about 10 percent) is evaluated as a function of angular scale for cosmological scenarios which include as dark matter neutrinos, warm particles with a rest mass in the keV range (gravitinos), cold particles or baryons. The polarization/anisotropy ratio is found to vary with the universal mass density parameter value employed and the spectral index chosen for the primeval density fluctuations. It is also shown that the polarization would not have been affected by a second ionization period such as the formation of the galaxies. Precise measurement of the degree of polarization is concluded to offer empirical constraints to values for the density parameter and the spectral index of the primeval density fluctuations.
Milaneschi E.
Valdarnini Riccardo
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