Evolution of adiabatic irregularities during the recombination era, and the missing mass in the universe

Details Evolution of adiabatic irregularities during the recombination era, and the missing mass in the universe Evolution of adiabatic irregularities during the recombination era, and the missing mass in the universe

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62..639z&link_type=abstract

(Astronomicheskii Zhurnal, vol. 62, July-Aug. 1985, p. 639-650) Soviet Astronomy (ISSN 0038-5301), vol. 29, July-Aug. 1985, p. 3

Astronomy and Astrophysics

Astrophysics

Adiabatic Conditions, Big Bang Cosmology, Fluctuation Theory, Hydrogen Recombinations, Missing Mass (Astrophysics), Hydrodynamics, Neutrinos, Particle Mass, Perturbation, Temporal Distribution

Scientific paper

The evolutionary dynamics of pregalactic fluctuations are numerically analyzed for a three-component model medium consisting of baryons, radiation, and a background of heavy, gravitating, but weakly interacting particles. Dissipative effects are analyzed numerically, and the plasma velocity field is calculated at the epoch of decoupling. In a model with three massive neutrino species of equal mass and thermodynamic number density, the perturbations in the plasma density when the redshift is about 1000 would amount to 0.1 percent at most. If instead the gravitating particle background consists of stable heavy leptons or primordial black holes, the maximum density contrast would be an order of magnitude lower. The gravitation of any density fluctuations in ordinary collisional matter during the recombination and postrecombination eras would modulate the amplitude of the small-scale part of the spectrum of inhomogeneities occurring in a background of massive neutrinos.

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