Physics – Nuclear Physics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..dnp.dg001k&link_type=abstract
American Physical Society, Division of Nuclear Physics Annual Meeting, October 25-28, 2006, abstract #DG.001
Physics
Nuclear Physics
Scientific paper
Experimental evidence suggests that the strong interactions conserve the discrete CP symmetry. Standard Model QCD, however, predicts that CP should be violated unless the angular parameter θ is exceedingly small (< 10-10). The most elegant and compelling solution to this so-called Strong-CP problem was proposed by Peccei and Quinn and involves the spontaneous breaking of a new U(1)PQ global symmetry. The axion arises as the pseudo-Goldstone Boson associated with this SSB. Astrophysics has played an important role in constraining the allowed axion mass. I will review the arguments from stellar evolution and supernovae that lead to an upper bound of 1-10 meV for the mass. Axions with μeV mass have not been ruled out and would have sufficient relic density to be a very plausible candidate for cold dark matter. I will describe different scenarios for axion production in the early universe and comment on their compatibility with current measurements of cosmological parameters. Finally, I will summarize the current experimental and theoretical bounds of the axion-to-photon coupling constant.
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