Fluid cosmology with decay and production of particles

Details Fluid cosmology with decay and production of particles Fluid cosmology with decay and production of particles

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gregr..26.1259z&link_type=abstract

General Relativity and Gravitation, Volume 26, Issue 12, pp.1259-1265

Mathematics

Logic

22

Scientific paper

We investigate the influence of particle number nonconserving processes on the thermal history and the dynamics of the universe. There occurs a backreaction both on the temperature and on the scale factor if particles of one species decay into particles of another species, or if the overall particle number changes. This backreaction is determined by the ratios of the relevant decay and production rates to the Hubble expansion rate. It results in reheating phenomena and modifications of the standard Friedmann-Lemaitre-Robertson-Walker (FLRW) expansion laws. A high production rate at the Planck scale tends to avoid the cosmological singularity.

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