Scalar Electrodynamics and Primordial Magnetic Fields

Details Scalar Electrodynamics and Primordial Magnetic Fields Scalar Electrodynamics and Primordial Magnetic Fields

1995-05-30

arxiv.org/abs/astro-ph/9505140v1

Phys.Rev. D52 (1995) 6694-6699

Astronomy and Astrophysics

Astrophysics

16 pages, LaTeX, no figures

Scientific paper

10.1103/PhysRevD.52.6694

A primordial magnetic field may be generated during an inflationary period if conformal invariance is broken. We reexamine and generalize previous results about the magnetic field produced by couplings of the form $R^n F_{\mu\nu}F^{\mu\nu}$. We show that the amplitude of the magnetic field depends strongly on $n$. For adequate values of $n$ the field produced can serve as seed for galactic magnetic fields. We also compute the effective interaction between the electromagnetic field and the geometry in the context of scalar QED (with and without classical conformal invariance). In both cases, the amplitude of the magnetic field is too small to be of astrophysical interest.

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