Physics – Nuclear Physics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985nuphb.260..215k&link_type=abstract
Nuclear Physics B, Volume 260, Issue 1, p. 215-226.
Physics
Nuclear Physics
144
Scientific paper
In this paper I consider models where the strong CP problem is solved by means of a Peccei-Quinn symmetry carried by exotic colored fermions. An example is Kim's recently proposed composite invisible axion model. Axions from such models don't couple to electrons, and have model dependent photon couplings which may differ from the standard coupling by a factor of 10-2 - 10+1. As a result, laboratory detection of relic axions may be very difficult, and astrophysical bounds on the axion mass are weakened. Pulsar observations place no strong bound on such an axion unless the core is known not to be superfluid. Normal fusion stars allow an axion mass as large as ma ⋍ 20 eV for certain models.
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