Saving the axions in superstring models

Details Saving the axions in superstring models Saving the axions in superstring models

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phlb..161..289y&link_type=abstract

Physics Letters B, Volume 161, Issue 4-6, p. 289-293.

Physics

39

Scientific paper

In the effective four-dimensional supersymmetric theories derived from the superstring theories, we investigate a possible way to evade the cosmological bound ƒ;a<~1012GeV on the axion decay constant. A significant amount of entropy could be produced by the out-of-equilibrium decay of the Higgs field which is responsible for the breaking of the extra gauge symmetry at an intermediate mass scale MI. The appearance of such a Higgs fiield is a general feature of the superstring models. We find that if the gravitino mass m3/2~1-102 GeV and MI~107-1010 GeV, the axions are diluted efficiently by the entropy production, and ƒ;a~O(1016 GeV) will still be acceptable.
Address after September 1, 1985: Department of Physics, The Johns Hopkins University, Baltimore, MD 21218, USA.

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