Mathematics – Logic
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phrvd..32..831u&link_type=abstract
Physical Review D (Particles and Fields), Volume 32, Issue 4, 15 August 1985, pp.831-842
Mathematics
Logic
33
Particle-Theory And Field-Theory Models Of The Early Universe, Late Stages Of Stellar Evolution
Scientific paper
It has been proposed that the ``mass turn-on'' of the axion field in the early Universe could have set that field into a large-amplitude coherent oscillation. We give here a general analysis of damping mechanisms for field oscillations of this nature which are operative during an era of ``mass turn-on.'' A thermal-damping mechanism is analyzed in detail. Order-of-magnitude estimates indicate that the mechanism could possibly be important for axions if the mass turn-on rate is very large near the QCD temperature. If part of the mass turn-on occurs in association with a phase transition, a similar damping mechanism due to phase nonequilibria could be operative. Furthermore, supercooling could lead to a very effective damping mechanism. In addition, phase separation could result in scattering of the axions and destruction of their coherence. Other damping mechanisms of a more mechanical nature are also analyzed. We conclude that the upper limit of ~1012 GeV for the vacuum expectation value associated with the spontaneous breaking of Peccei-Quinn symmetry-previously derived from arguments concerning cosmological overproduction of coherent axions-should not be considered as firm.
Unruh William G.
Wald Robert M.
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