Ferromagnetism of Axion Domain Wall

Details Ferromagnetism of Axion Domain Wall Ferromagnetism of Axion Domain Wall

1997-03-05

arxiv.org/abs/hep-ph/9703237v1

Phys.Lett. B406 (1997) 304-308

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, Revtex

Scientific paper

10.1016/S0370-2693(97)00696-5

We show that axion domain wall is ferromagnetic in the universe with nonvanishing baryon number or lepton number. It is caused by protons and electrons bounded to the domain wall with their spins aligned. These bound states arise due to attractive potentials generated through pseudo-vector couplings between the fermions and the axion. Using a model of hadronic axions we predict existence of a primordial magnetic field with strength $10^{-13}$ Gauss at recombination.

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