Phys. Rev. Lett. 101, 011801 (2008) [4 pages]Strong CP Problem with 1032 Standard Model CopiesReceived 1 January 2008; published 1 July 2008 We show that a recently proposed solution to the hierarchy problem simultaneously solves the strong CP problem, without requiring an axion or any further new physics. Consistency of black hole physics implies a nontrivial relation between the number of particle species and particle masses, so that with ∼1032 copies of the standard model, the TeV scale is naturally explained. At the same time, as shown here, this setup predicts a typical expected value of the strong-CP parameter in QCD of θ∼10-9. This strongly motivates a more sensitive measurement of the neutron electric dipole moment. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.011801
DOI:
10.1103/PhysRevLett.101.011801
PACS:
11.30.Er, 12.38.Aw, 12.60.−i
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