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Cosmological Magnetic Fields from Ultralight Dark Matter
Robert Brandenberger1, Jürg Fröhlich2, Hao Jiao1,3
1McGill University, Department of Physics, Montréal, Quebec H3A 2T8, Canada.
Abstract:
We propose a mechanism for the generation of magnetic fields on cosmological scales that is operative after recombination. An essential ingredient is an instability (of parametric resonance type) of the electromagnetic field driven by an oscillating pseudoscalar dark-matter field, ϕ, that is coupled to the electromagnetic field tensor via a ϕF∧F term in the Lagrangian of axion electrodynamics. We find that magnetic fields larger than the observational lower bounds can be generated soon after recombination on scales of 1 Mpc.
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