Do axions need inflation?

Details Do axions need inflation? Do axions need inflation?

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nuphb.324..167d&link_type=abstract

Nuclear Physics B, Volume 324, Issue 1, p. 167-186.

Physics

Nuclear Physics

85

Scientific paper

Without inflation the energy density of relic axions in a Robertson-Walker universe arises not from coherent oscillations of a zero-momentum mode but from radiative decay of axion strings. An estimate of the upper bound on the PQ scale coming from these axions is in conflict with the lower bound from SN1987a. We present analytical and numerical evidence supporting this estimate. If true, then the axion needs inflation. With inflation the axion is safe, but the motivation for axion search experiments is weakened.

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