Opher 1997 NMGEC机制产生宇宙里的大尺度磁场

主要内容:

直接把磁偶极矩和角动量联系起来了，并且还几乎不含参数。

此文是产生1e-5Gauss的大尺度磁场，但是按说也能产生致密天体包括黑洞的高强度的磁场。

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Title:		Origin of Magnetic Fields in the Universe due to Nonminimal Gravitational-Electromagnetic Coupling
Authors:		Opher, Reuven; Wichoski, Ubirajara F.
Affiliation:		AA(Instituto de Astronomia e Geofísica, Universidade de São Paulo, Av. Miguel Stefano, 4.200, CEP 04301-904, São Paulo, SP, Brazil), AB(Instituto de Astronomia e Geofísica, Universidade de São Paulo, Av. Miguel Stefano, 4.200, CEP 04301-904, São Paulo, SP, Brazil)
Publication:		Physical Review Letters, Volume 78, Issue 5, February 3, 1997, pp.787-790 (PhRvL Homepage)
Publication Date:		02/1997
Origin:		AIP; APS
DOI:		10.1103/PhysRevLett.78.787
Bibliographic Code:		1997PhRvL..78..787O

Abstract

Basically the only existing theories for the creation of a magnetic field (B) in the Universe are the creation of a seed field ~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 ~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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