Ferromagnetic properties of charged vector boson condensate

Details Ferromagnetic properties of charged vector boson condensate Ferromagnetic properties of charged vector boson condensate

2010-05-15

arxiv.org/abs/1005.2702v2

JCAP08(2010)031

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Some numerical estimates and discussions are added according to the referee's suggestions. This version is accepted for public

Scientific paper

10.1088/1475-7516/2010/08/031

Bose-Einstein condensation of W bosons in the early universe is studied. It is shown that, in the broken phase of the standard electroweak theory, condensed W bosons form a ferromagnetic state with aligned spins. In this case the primeval plasma may be spontaneously magnetized inside macroscopically large domains and form magnetic fields which may be seeds for the observed today galactic and intergalactic fields. However, in a modified theory, e.g. in a theory without quartic self interactions of gauge bosons or for a smaller value of the weak mixing angle, antiferromagnetic condensation is possible. In the latter case W bosons form scalar condensate with macroscopically large electric charge density i.e. with a large average value of the bilinear product of W-vector fields but with microscopically small average value of the field itself.

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