Magnetic Fields from Heterotic Cosmic Strings

Details Magnetic Fields from Heterotic Cosmic Strings Magnetic Fields from Heterotic Cosmic Strings

2008-11-12

arxiv.org/abs/0811.1993v1

Phys.Rev.D79:083502,2009

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, 2 .eps figures, PRD format

Scientific paper

0.1103/PhysRevD.79.083502

Large-scale magnetic fields are observed today to be coherent on galactic scales. While there exists an explanation for their amplification and their specific configuration in spiral galaxies -- the dynamo mechanism -- a satisfying explanation for the original seed fields required is still lacking. Cosmic strings are compelling candidates because of their scaling properties, which would guarantee the coherence on cosmological scales of any resultant magnetic fields at the time of galaxy formation. We present a mechanism for the production of primordial seed magnetic fields from heterotic cosmic strings arising from M theory. More specifically, we make use of heterotic cosmic strings stemming from M5--branes wrapped around four of the compact internal dimensions. These objects are stable on cosmological time scales and carry charged zero modes. Therefore a scaling solution of such defects will generate seed magnetic fields which are coherent on galactic scales today.

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