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Strong CP Violation in External Magnetic Fields · Around

2007

Strong CP Violation in External Magnetic Fields

Millo, R., Faccioli, P.

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We study the response of the QCD vacuum to an external magnetic field, in the presence of strong CP violation.

Using chiral perturbation theory and large N_c expansion, we show that the external field would polarize quantum fluctuations and induce an electric dipole moment of the vacuum, along the direction of the magnetic field.
We estimate the magnitude of this effect in different physical scenarios.
In particular, we find that the polarization induced by the magnetic field of a magnetar could accelerate electric charges up to energies of the order \theta 10^3 TeV.

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