Strong CP Violation in External Magnetic Fields

Details Strong CP Violation in External Magnetic Fields Strong CP Violation in External Magnetic Fields

2007-06-06

arxiv.org/abs/0706.0805v2

Phys.Rev.D77:065013,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure. Major revision. Phenomenological analysis extended

Scientific paper

10.1103/PhysRevD.77.065013

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. We also suggest a connection with the possible existence of "hot-spots" on the surface of neutron stars.

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