Interacting Matter and Radiation in Homogeneous Isotropic World Models

Details Interacting Matter and Radiation in Homogeneous Isotropic World Models Interacting Matter and Radiation in Homogeneous Isotropic World Models

Jan 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ijtp....9...47k&link_type=abstract

International Journal of Theoretical Physics, Volume 9, Issue 1, pp.47-54

Physics

Scientific paper

Transitions between two or more fluids may result in changes of the total amount of radiation in the universe without violating overall energy conservation. Special rate equations for such processes are discussed, for which the radius of the universe as a function of time can be found by numerical integration of a single differential equation, and the radiation density can then be easily obtained, although it must be verified as positive for all times. The integrations are carried out and reported here for the simplest rate equation for two fluids for various values of the initial mass of one fluid, the transition rate, and the cosmological constant.

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