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Why PQ?

I discuss how the solution of the $U(1)_A$ problem of QCD through the existence of the $θ$-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: $U(1)_{PQ}$

4 nodes4 linksoverview previewWhy PQ?
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Why PQ?4 visible / 4 total nodes / 4 links
AuthorshipTopic signalTopic signalRelated contextWWhy PQ?preprint / 2010AR. D. PecceiResearcherThep-ph13193 worksThep-th13268 works
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Why PQ?

preprint / 2010

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