Equilibrium matter fields in the early universe

Details Equilibrium matter fields in the early universe Equilibrium matter fields in the early universe

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..602b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, April 15, 1990, p. 602-609.

Astronomy and Astrophysics

Astronomy

2

Black Body Radiation, Elementary Particles, Particle Mass, Thermodynamic Equilibrium, Universe, Cosmology, High Energy Interactions, Mass Spectra, Relativistic Particles

Scientific paper

The behavior of matter and radiation in thermal equilibrium when there is a continuous mass spectrum of elementary particle states is investigated. The detailed forms of the density and pressure in the relativistic and nonrelativistic limits are calculated for power-law and power-law times exponential forms for the density of states spectrum. The spectrum of fluctuations from thermal equilibrium is also derived in each case. These results are used to study the change in behavior of Friedman universes when there exists a continuous spectrum of mass states in the early universe. The results are compared with the standard picture which assumes a discrete spectrum of elementary particle mass states. Connections with string theories are also discussed.

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