Effect of various cross-section energy dependences in calculations of cosmological viscosity |
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| Authors: | Richard A Matzner |
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| Institution: | (1) Dept. of Physics, The University of Texas, Austin, Tex., USA;(2) University of Texas at Austin, Austin, USA |
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| Abstract: | The Einstein Field Equations for homogeneous cosmologies are considered within the viscosity approximation. It is shown that some power laws   T
m
(whereT is the temperature) for the cross-section 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.Research was sponsored in part by the Aerospace Research Laboratories, Office of Aerospace Research, United States Air Force, Contract F33615-68-C-1675. |
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