FERROMAGNETIC VACUUM AND GALACTIC MAGNETIC-FIELDS

Non-abelian gauge theories may have a ferromagnet-like vacuum with a non-zero magnetic field, which also exists at finite temperature. We argue that the formation of the ferromagnet-like vacuum at GUT scales gives rise to a Maxwell magnetic field imprinted on the comoving plasma. This results in a coherent magnetic field pertaining the whole universe, with a magnitude B(now) congruent-to 10(-14) G, which is of the correct size to serve as the seed field for the galactic dynamo. The seed field is thus a non-perturbative quantum effect.