Relaxing Axions
S. M. Barr
Abstract
A mechanism for lifting the cosmological upper bound on the axion decay constant, fa, is proposed. It entails the near masslessness of the radial mode whose vacuum expectation value is fa. Energy in the coherent oscillations of the axion field in the early universe gets fed into the motion of the radial mode, from which it is then redshifted away.
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