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Strong CP Problem with 10^{32} Standard Model Copies · Around

2007

Strong CP Problem with 10^{32} Standard Model Copies

Dvali, Gia, Farrar, Glennys R.

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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 non-trivial relation between the number of particle species and particle masses, so that with ~10^{32} 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 theta ~ 10^{-9}.
This strongly motivates a more sensitive measurement of the neutron electric dipole moment.

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Similar

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C. Vafa and E. Witten, Phys. Rev. Lett. 53 (1984) 535
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2001
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Cited in the paper.
G. Dvali, hep-th/0507215
Cited in the paper.
Y. Watanabe, E. Komatsu, arXiv:0711.3442 [hep-th]
Original
Cited in the paper.

Then

G. Veneziano, JHEP 0206:051,2002
2002
Later among the works it cites.
G. Dvali, R. Jackiw and S.-Y. Pi, Phys. Rev. Lett
2006
Later among the works it cites.
G. Dvali, arXiv:0706.2050 [hep-th]
Original
2050
Closest in time.

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