Computer Science – Sound
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ncimb.112.1561r&link_type=abstract
Nuovo Cimento B, Vol. 112B, No. 12, p. 1561 - 1575
Computer Science
Sound
Cosmology: Density Perturbations, Galaxies: Masses
Scientific paper
Cosmological density perturbations with masses below 1015Msun are the subject. Their evolution from cosmological times where they are stable (before hydrogen recombination) to times where they are unstable (after recombination) is studied. It is found that not the amplification of the density contrasts by pure self-gravity in the unstable phase is dominant but the amplification during times of stability just before the perturbations become unstable. The decoupling of the radiation from the matter perturbations during the recombination plays a crucial role, which leads to a steep drop of the speed of sound. The larger the masses are, the smaller the amplification is. Above 1012Msun - 1013Msun the amplification is so small that this can be regarded as upper limits for galaxies.
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