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Origin of Magnetic Fields in the Universe Due to Nonminimal Gravitational-Electromagnetic Coupling | | R. Opher
; U. F. Wichoski
; | | Date: |
28 Dec 1996 | | Journal: | Phys.Rev.Lett. 78 (1997) 787-790 | | Subject: | astro-ph gr-qc | | Abstract: | 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. | | Source: | arXiv, astro-ph/9701220 | | Services: | Forum | Review | PDF | Favorites | |
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