Planck-scale corrections to axion models

Details Planck-scale corrections to axion models Planck-scale corrections to axion models

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..46..539b&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 46, Issue 2, 15 July 1992, pp.539-549

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94

Particle-Theory And Field-Theory Models Of The Early Universe, Charge Conjugation, Parity, Time Reversal, And Other Discrete Symmetries, Elementary Particle Processes

Scientific paper

It has been argued that quantum gravitational effects will violate all nonlocal symmetries. Peccei-Quinn symmetries must therefore be an ``accidental'' or automatic consequence of local gauge symmetry. Moreover, higher-dimensional operators suppressed by powers of MPl are expected to explicitly violate the Peccei-Quinn symmetry. Unless these operators are of dimension d>=10, axion models do not solve the strong CP problem in a natural fashion. A small gravitationally induced contribution to the axion mass has little if any effect on the density of relic axions. If d=10, 11, or 12 these operators can solve the axion domain-wall problem, and we describe a simple class of Kim-Shifman-Vainshtein-Zakharov axion models where this occurs. We also study the astrophysics and cosmology of ``heavy axions'' in models where 5<=d<=10.

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