Cosmologies with a Synge gas and radiation

Details Cosmologies with a Synge gas and radiation Cosmologies with a Synge gas and radiation

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.189..767s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 189, Dec. 1979, p. 767-775.

Mathematics

Logic

6

Astronomical Models, Baryons, Black Body Radiation, Cosmology, Equations Of State, Gas Expansion, Computerized Simulation, Electron Energy, Photons, Proton Energy, Relativistic Effects, Thermodynamic Equilibrium

Scientific paper

The paper derives a relativistic equation of state in the context of the Friedmann cosmological models which allows a uniform and precise description of thermodynamics during expansion. The formalism permits a natural treatment of low photon/baryon ratios, considering the simplest case of non-degenerate protons, electrons, and blackbody radiation which shows that photon number is generally not conserved. A family of models is generated characterized by the total number of baryons within some fiducial radius, the curvature constant K, and the initial photon/baryon ratio. The results of computer calculations for low and high photon/baryon ratios are compared and their Jeans mass curves presented.

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