Production of new cosmological perturbations during the radiation-dominated ERA

Details Production of new cosmological perturbations during the radiation-dominated ERA Production of new cosmological perturbations during the radiation-dominated ERA

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..137p&link_type=abstract

Nature, vol. 279, May 10, 1979, p. 137-139.

Computer Science

Sound

10

Cosmic Dust, Cosmic Rays, Cosmology, Flow Velocity, Gas Flow, Perturbation Theory, Adiabatic Conditions, Entropy, Photon-Electron Interaction, Shock Waves, Sound Propagation, Stochastic Processes, Velocity Distribution, Viscous Drag

Scientific paper

The tendency noted for dust particles to cluster when they are coupled by viscous drag to a gas with a stochastic velocity field is applied to the cosmology of the radiation-dominated era. The clustering effect is considered capable of generating relatively large isothermal perturbations (which may lead to globular clusters or galaxies) from relatively small adiabatic perturbations. In the cosmological application, dust is taken to be represented by protons and helium nuclei, while the dominant component of the gas is photons; the baryons are viscously coupled to the photon gas primarily by means of radiation drag on their attendant electrons. Calculations are presented to show that 10% adiabatic perturbations will generate 1% isothermal perturbations in the mass range of one billion to one trillion solar masses. The clustering process is considered to dominate the dissipation of shock waves as a process that can generate entropy perturbations.

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