Updated constraints on axions from SN1987A

Details Updated constraints on axions from SN1987A Updated constraints on axions from SN1987A

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phlb..219..515m&link_type=abstract

Physics Letters B, Volume 219, Issue 4, p. 515-520.

Physics

44

Scientific paper

We recently determined a lower bound on the axion decay constant (upper bound on the axion mass) by demanding that the axion emission rate in SN1987A be small enough to be consistent with the observed neutrino emission. We estimate here the magnitude of corrections to our previous results due to high density effects, ϱ exchange and the restoration of chiral symmetry. Assuming a non-degenerate core, we now find that for naive quark model couplings fa>~0.2×1012 GeV(ma<~3.6×10-4 eV) which is a factor of 4 different from our previous limits assuming a degenerate core. Limits using couplings derived from EMC measurements are a factor of 2-4 weaker. We show that there is no window in fa for non-freely-streaming axions. These limits still imply that the remaining window for axions is the one which is the most interesting for cosmology.

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