PRIMORDIAL MAGNETIC-FIELDS IN FALSE VACUUM INFLATION

We show that, during false vacuum inflation. a primordial magnetic fie ld can be created sufficiently strong to seed the galactic dynamo and generate the observed galactic magnetic fields. Considering the inflat on-dominated regime, our held is produced by the Higgs-field gradients , resulting from a grand unified phase transition. The evolution of th e field is followed from its creation through to the epoch of structur e formation, subject to the relevant constraints. We find that it is p ossible to create a magnetic field of sufficient magnitude, occurs dur ing the final five e-foldings of the inflationary period.