The spontaneous generation of uniform magnetic condensate in QED3​ gives
rise to ferromagnetic domain walls at the electroweak phase transition. These
ferromagnetic domain walls are caracterized by vanishing effective surface
energy density avoiding, thus, the domain wall problem. Moreover we find that
the domain walls generate a magnetic field B≃1024Gauss at the
electroweak scale which account for the seed field in the so called dynamo
mechanism for the cosmological primordial magnetic field. We find that the
annihilation processes of walls with size R≃105Km could release an
energy of order 1052erg indicating the invisible ferromagnetic walls as
possible compact sources of Gamma Ray Bursts.Comment: LaTeX, 8 pages, 1 figur