Creation of cosmological magnetic fields in a bouncing cosmology
  We show (in a completely analytical and exact manner) that an efficient magnetic field amplification method is operative during the bounce in a time-dependent gauge coupling model. The cosmological magnetic fields so generated have particular spectral features, and may be observed by future CMB measurements and by direct cluster measurements. 
J. M. Salim, N. Souza, S. E. Perez Bergliaffa, T. Prokopec