Seed perturbations for primordial magnetic fields from MSSM flat directions

We demonstrate that the minimally supersymmetric standard model (MSSM) flat directions can naturally account for the seed magnetic fields in the early Universe. The non-zero vacuum expectation value of an MSSM flat direction condensate provides masses to the gauge fields and thereby breaks conformal invariance. During inflation the condensate receives spatial perturbations and SU(2) × U(1)Y gauge currents are generated together with (hyper)magnetic fields. When these long wavelength vector perturbations re-enter our horizon they give rise to U(1)em magnetic fields with an amplitude of 10−30 G, as required by the dynamo mechanism.