Effect of Various Cross-Section Energy Dependences in Calculations of Cosmological Viscosity

Details Effect of Various Cross-Section Energy Dependences in Calculations of Cosmological Viscosity Effect of Various Cross-Section Energy Dependences in Calculations of Cosmological Viscosity

Aug 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969ap%26ss...4..459m&link_type=abstract

Astrophysics and Space Science, Volume 4, Issue 4, pp.459-463

Astronomy and Astrophysics

Astrophysics

8

Scientific paper

The Einstein Field Equations for homogeneous cosmologies are considered within the viscosity approximation. It is shown that some power laws σ˜T m (whereT is the temperature) for the cross-section σ lead to collisionless behavior near the initial singularity in a ‘big bang’ model. Under some circumstances one may have two viscous phases, as the cosmic fluid passes from collisionless to collisional to collisionless again, while the universe expands.

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