Magnetic field production after inflation
  We study the electromagnetic field production during preheating after hybrid inflation in a model with the field content of the Standard Model, coupled to a singlet inflaton. We find that very soon after symmetry breaking our system enters a regime of kinetic turbulence, characterized by a self-similar behaviour of the energy spectra and a power-like dependence on time of the inflaton and Higgs field variances. 
Andres Diaz-Gil, J. Garcia-Bellido, M. Garcia Perez and A.   Gonzalez-Arroyo