Dilution of cosmological axions by entropy production

Details Dilution of cosmological axions by entropy production Dilution of cosmological axions by entropy production

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nuphb.346..193l&link_type=abstract

Nuclear Physics B, Volume 346, Issue 1, p. 193-212.

Physics

Nuclear Physics

62

Scientific paper

The usual cosmological bound on axions can be significantly relaxed if the universe experienced a period of entropy production between the time axions were produced and nucleosynthesis. We discuss a scenario in which a large amount of entropy is generated by decaying particles of mass 1-10 TeV. We find that nucleosynthesis constraints the decay lifetimes to be less than about 0.03 seconds. Using this limiting lifetime, we derive cosmological limits on the axion mass and find that ma >~ 9 × 10-8 eV if the axion density is dominated by radiation from strings. This limit is far from the limit ma <~ 10-3 based on supernova 1987A, thus showing clearly a case where axionic strings do not need to be inflated away. If the strings were inflated away, we can relax the axion mass bound to ma >~ 5 × 10-9 eV.

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