A possible anthropic solution to the Strong CP problem

Details A possible anthropic solution to the Strong CP problem A possible anthropic solution to the Strong CP problem

2008-04-16

arxiv.org/abs/0804.2478v3

Progress of Theoretical Physics Vol. 121 No. 4 (2009) pp. 711-725

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 2 figures.v2: references added.v3:a version to appear in Progress of Theoretical Physics

Scientific paper

10.1143/PTP.121.711

We point out that the long-standing strong CP problem may be resolved by an anthropic argument. The key ideas are: (i) to allow explicit breaking(s) of the Peccei-Quinn symmetry which reduces the strong CP problem to the cosmological constant problem, and (ii) to conjecture that the probability distribution of the vacuum energy has a mild pressure towards higher values. The cosmological problems of the (s)axion with a large Peccei-Quinn scale are absent in our mechanism, since the axion acquires a large mass from the explicit breaking.

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