Strong CP problem with 1032 standard model copies

Gia Dvali, Glennys R. Farrar

    Research output: Contribution to journalArticlepeer-review


    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.

    Original languageEnglish (US)
    Article number011801
    JournalPhysical Review Letters
    Issue number1
    StatePublished - Jul 1 2008

    ASJC Scopus subject areas

    • General Physics and Astronomy


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