Magnetic and electric properties of quantum vacuum
  In this report we show that vacuum is a nonlinear optical medium and we discuss what are the optical phenomena that should exist in the framework of the standard model of particle physics. We pay special attention to the low energy limit. The predicted effects for photons of energy smaller than the electron rest mass are of such a level that none has been observed experimentally yet. Progresses in field sources and related techniques seem to indicate that in few years vacuum nonlinear optics will be accessible to human investigation. 
R\'emy Battesti (LNCMI), Carlo Rizzo (LNCMI)
physics.optics quant-ph