Origin of Magnetic Fields in the Universe Due to Nonminimal Gravitational-Electromagnetic Coupling

Details Origin of Magnetic Fields in the Universe Due to Nonminimal Gravitational-Electromagnetic Coupling Origin of Magnetic Fields in the Universe Due to Nonminimal Gravitational-Electromagnetic Coupling

1997-01-28

arxiv.org/abs/astro-ph/9701220v1

Phys.Rev.Lett. 78 (1997) 787-790

Astronomy and Astrophysics

Astrophysics

5 pages, Latex (Revtex), no figures, To appear in PRL

Scientific paper

10.1103/PhysRevLett.78.787

Basically the only existing theories for the creation of a magnetic field B in the Universe are the creation of a seed field of order 10^{-20} G in spiral galaxy which is subsequently supposedly amplified up to the observed 10^{-6} - 10^{-5} G by a dynamo process or a seed intergalactic field of magnitude 10^{-12} - 10^{-10} G which is amplified by collapse and differential rotation. No satisfactory dynamo theory, however, exists today. We show that a 10^{-6} - 10^{-5} G magnetic field in spiral galaxies is directly obtained from a nonminimal gravitational-electromagnetic coupling, without the need of significant dynamo amplification.

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