Induced electromagnetic fields in non-linear QED

C.A. DOMINGUEZ; H. FALOMIR; M. IPINZA; M. LOEWE; J.C. ROJAS

MODERN PHYSICS LETTERS A

World Scientific Publishing Co.

Año: 2009 vol. 24 p. 1857 - 1862

0217-7323

The Euler-Heisenberg effective Lagrangian is used to obtain general expressions for electric and magnetic fields induced by non-linearity, to leading order in the non-linear expansion parameter, and for quasi-static situations. These expressions are then used to compute the induced electromagnetic fields due to a spherical shell with uniform charge distribution on the surface, in the presence of an external constant magnetic field. The induced electric field contains several multipole terms with unusual angular dependence. Most importantly, the leading term of the induced magnetic field is due to an induced magnetic dipole moment.