QED vacuum fluctuations and induced electric dipole moment of the neutron
Abstract
Quantum fluctuations in the QED vacuum generate nonlinear effects, such as peculiar induced electromagnetic fields. In particular, we show here that an electrically neutral particle, possessing a magnetic dipole moment, develops an induced electric dipoletype moment with unusual angular dependence, when immersed in a quasistatic, constant external electric field. The calculation of this effect is done in the framework of the EulerHeisenberg effective QED Lagrangian, corresponding to the weak field asymptotic expansion of the effective action to oneloop order. It is argued that the neutron might be a good candidate to probe this signal of nonlinearity in QED.
 Publication:

Physical Review D
 Pub Date:
 August 2009
 DOI:
 10.1103/PhysRevD.80.033008
 arXiv:
 arXiv:0907.1944
 Bibcode:
 2009PhRvD..80c3008D
 Keywords:

 12.20.Ds;
 11.10.z;
 Specific calculations;
 Field theory;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment;
 High Energy Physics  Lattice;
 High Energy Physics  Theory;
 Nuclear Experiment
 EPrint:
 A misprint has been corrected, and three new references have been added