Abstract
Abstract
We show that a primeval seed magnetic field arises due to spin-degeneracy
breaking of fermions caused by the dragging of inertial frames in the curved
spacetime of rotating astrophysical bodies. This seed magnetic field would arise
even due to electrically neutral fermions such as neutrons. As examples, firstly
we show that an ideal neutron star rotating at 500 revolutions per second,
having mass 0.83 M⊙ and described by an ensemble of degenerate
neutrons, would have 0.12 Gauss seed magnetic field at its center arising
through the breaking of spin-degeneracy. Secondly, similar seed field at a
proto-galactic stage for the Milky Way galaxy as implied by its observed
rotation curve is estimated to be between 10-19–10-24 Gauss, a field
strength which is known to be sufficient to produce presently observed
microgauss magnetic field.