Effective Lagrangian at Cubic Order in Electromagnetic Fields and Vacuum Birefringence
Abstract
Description
The effective Lagrangian of electromagnetic fields at the cubic order in field strength has been considered. This generalized Lagrangian is motivated by electrodynamics on non-commutative spaces. We find the canonical and symmetrical energy-momentum tensors and show that they possess non-zero traces. The propagation of a linearly polarized laser beam in the external transverse magnetic field is investigated. We evaluate the induced ellipticity which allows us to obtain a constraint on parameters introduced from the PVLAS experimental data.
10 pages, no figures, added note, published version
10 pages, no figures, added note, published version