Cosmological Magnetic Fields from Primordial Helicity

Details Cosmological Magnetic Fields from Primordial Helicity Cosmological Magnetic Fields from Primordial Helicity

1998-11-12

arxiv.org/abs/astro-ph/9811206v3

Phys.Rev. D62 (2000) 103008

Astronomy and Astrophysics

Astrophysics

13 pages

Scientific paper

10.1103/PhysRevD.62.103008

Primordial magnetic fields may account for all or part of the fields observed in galaxies. We consider the evolution of the magnetic fields created by pseudoscalar effects in the early universe. Such processes can create force-free fields of maximal helicity; we show that for such a field magnetic energy inverse cascades to larger scales than it would have solely by flux freezing and cosmic expansion. For fields generated at the electroweak phase transition, we find that the predicted wavelength today can in principle be as large as 10 kpc, and the field strength can be as large as 10^{-10} G.

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