Prog. Theor. Phys. Vol. 86 No. 5 (1991) pp. 1021-1030
Effect of Rayleigh Scattering on Cosmic Microwave Background Anisotropies
Department of Physics, Tokyo Metropolitan University, Hachioji 192-03
(Received July 5, 1991)
We study the effect of Rayleigh scattering off neutral hydrogens on CMB anisotropies. We numerically solved the evolution of frequency dependent radiation perturbations coupled with matter perturbations for baryon dominated Ω= 1 universe in the synchronous gauge. It is found that at wavelengths shorter than 0.05 cm radiation perturbations are significantly damped and that small scale CMB anisotropies are smaller by 20% than those obtained when only Thomson scattering is taken into account. Thus the effect of Rayleigh scattering is milder than suggested by La. Rayleigh scattering has little effect on matter perturbations and radiation perturbations at longer wavelengths.
DOI : 10.1143/PTP.86.1021
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