QCD Vacuum in the Early Universe

Details QCD Vacuum in the Early Universe QCD Vacuum in the Early Universe

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrvl..78..420s&link_type=abstract

Physical Review Letters, Volume 78, Issue 3, January 20, 1997, pp.420-423

Physics

Scientific paper

The thermal equilibrium value of the number density of the vacuum fluctuations (instantons) in QCD has been determined by Gross, Pisarski, and Yaffe for the high temperature of the early Universe. It is shown that, in coming to thermal equilibrium, all \|θ,vac> states are suppressed except those with θ = +/-\(π/2\). The instanton contribution to the electric dipole moment of the neutron is found to depend only on the chiral phase of the quark mass matrix and is no larger than its experimental upper limit so that the ``strong CP problem'' appears to be eliminated by this identification of the vacuum state.

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