Magnetic Helicity Generation from the Cosmic Axion Field

Details Magnetic Helicity Generation from the Cosmic Axion Field Magnetic Helicity Generation from the Cosmic Axion Field

2005-08-30

arxiv.org/abs/astro-ph/0508653v2

Phys.Rev.D72:123001,2005

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. Accepted for publication in Phys. Rev. D. Minor revisions and new references added

Scientific paper

10.1103/PhysRevD.72.123001

The coupling between a primordial magnetic field and the cosmic axion field generates a helical component of the magnetic field around the time in which the axion starts to oscillate. If the energy density of the seed magnetic field is comparable to the energy density of the universe at that time, then the resulting magnetic helicity is about |H_B| \simeq (10^{-20} G)^2 kpc and remains constant after its generation. As a corollary, we find that the standard properties of the oscillating axion remain unchanged even in the presence of very strong magnetic fields.

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