Spectral distortions of the microwave background radiation resulting from the damping of pressure waves

Details Spectral distortions of the microwave background radiation resulting from the damping of pressure waves Spectral distortions of the microwave background radiation resulting from the damping of pressure waves

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371...14d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 10, 1991, p. 14-28. NSF-supported research.

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35

Astronomical Spectroscopy, Damping, Elastic Waves, Microwaves, Relic Radiation, Universe, Computational Astrophysics, Mass Distribution, Perturbation Theory, Photons, Power Spectra, Radiation Distribution

Scientific paper

Initial perturbations of the energy density of the radiation field associated with initial perturbations of the mass density on scales relevant for galaxies and clusters of galaxies are not observable as anisotropies of the temperature of the microwave background radiation. By the recombination epoch, the initial inhomogeneities in the photon distribution is smoothed out by the processes of nonlinear dissipation and photon diffusion on mass scales. As initial inhomogenities of the energy density of the radiation field on scales less than the damping scale at recombination is not seen as an anisotropy in the microwave background but as a spectral distortion of the background. Signatures of pressure wave damping over certain redshift intervals are identified, and an upper bound is obtained for the index of the initial power spectrum of the mass distribution.

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