Decaying particles do not ``heat up'' the Universe

Details Decaying particles do not ``heat up'' the Universe Decaying particles do not ``heat up'' the Universe

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phrvd..31..681s&link_type=abstract

Physical Review D (Particles and Fields), Volume 31, Issue 4, 15 February 1985, pp.681-688

Physics

95

Particle-Theory And Field-Theory Models Of The Early Universe, Unified Field Theories And Models, Origin, Formation, And Abundances Of The Elements

Scientific paper

It is usually assumed that a massive relic species, which comes to dominate the mass density of the Universe and later decays, ``heats up'' the Universe when the age of the Universe ~= its lifetime. We show that if its decay follows the usual exponential decay law, then the Universe is never reheated, rather it just cools more slowly. We calculate the evolution of the temperature and entropy, and find that to within numerical factors of order unity, the usual estimates for the entropy increase are correct. Our results have implications for primordial nucleosynthesis in scenarios where a massive relic with lifetime ~= 10-2-103 sec is present, and for baryogenesis in the new inflationary Universe scenario.

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