The seed of magnetic monopoles in the early inflationary universe from a   5D vacuum state
  Starting from a 5D Riemann flat metric, we have induced an effective 4D Hermitian metric which has an antisymmetric part which is purely imaginary. We have worked an example in which both, non-metricity and contorsion are zero. We obtained that the production of monopoles should be insignificant at the end of inflation and the tensor metric should come asymptotically diagonal and describing a nearly 4D de Sitter expansion. 
Jesus Martin Romero (Mar del Plata University), Mauricio Bellini (Mar   del Plata University & CONICET)