Propagation of cosmological perturbations - the velocity of sound in the recombination epoch.

Details Propagation of cosmological perturbations - the velocity of sound in the recombination epoch. Propagation of cosmological perturbations - the velocity of sound in the recombination epoch.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ncimb.111.1125r&link_type=abstract

Nuovo Cimento B, Vol. 111B, No. 9, p. 1125 - 1133

Computer Science

Sound

2

Universe: Recombination Era, Universe: Density Perturbations

Scientific paper

On a cosmological background of radiation and matter the propagation of matter density perturbations is studied. The speed of sound is calculated before, during and after the recombination era. The model is that of matter-radiation as a hydrodynamical single fluid. The coupling strength of radiation to matter is taken into account by the ratio of the spatial perturbation scale to the mean free path of the photons via Thomson scattering. The speed of sound becomes scale dependent. The Jeans stability borders of the matter perturbations are calculated during and near the recombination epoch.

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