Why PQ?

Details Why PQ? Why PQ?

2010-05-04

arxiv.org/abs/1005.0643v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited talk given at the Axion 2010 Conference, January 15-17, 2010, Univ. of Florida, Gainsville, FL

Scientific paper

I discuss how the solution of the $U(1)_A$ problem of QCD through the
existence of the $\theta$-vacuum gave rise to the strong CP problem. After
examining various suggested solutions to this problem, I conclude that the only
viable solution still is the one that involves the existence of a spontaneously
broken chiral symmetry: $U(1)_{PQ}$

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