Effect of a Magnetic Field on the Electroweak Symmetry
  We discuss the effect of a strong magnetic field in the behavior of the symmetry of an electrically neutral electroweak plasma. We analyze the case of a strong field and low temperatures as compared with the W rest energy. If the magnetic field is large enough, it is self-consistently maintained. Charged vector bosons play the most important role, leading only to a decrease of the symmetry breaking parameter, the symmetry restoration not being possible. 
E. Rodriguez Querts, H. Perez Rojas and A. Perez Martinez