Magnetic helicity and cosmological magnetic field

Abstract

The magnetic helicity has paramount significance in nonlinear saturation of galactic dynamo. We argue that the magnetic helicity conservation is violated at the lepton stage in the evolution of early Universe. As a result, a cosmological magnetic field which can be a seed for the galactic dynamo obtains from the beginning a substantial magnetic helicity which has to be taken into account in the magnetic helicity balance at the later stage of galactic dynamo.

arXiv comment11 pages, no figures; v3: new references and new paragraphs added, discussion extended, some mistypings corrected

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