A limit on the inflationary energy density from axion isocurvature fluctuations

Details A limit on the inflationary energy density from axion isocurvature fluctuations A limit on the inflationary energy density from axion isocurvature fluctuations

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phlb..236..408l&link_type=abstract

Physics Letters B, Volume 236, Issue 4, p. 408-410.

Physics

43

Scientific paper

It is shown that the existence of axions arising from a Peccei-Quinn symmetry which is already broken at the onset of inflation implies an upper limit on the energy density V during inflation V1/4 < 5 × 10-5mPl, where mPl is the Planck energy. The limit comes from requiring that isocurvature perturbations in the axion density should not produce a microwave background anisotropy in excess of the observational limit.

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