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Chiral anomaly and dynamos from inhomogeneous chemical potential fluctuations
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In the standard model of particle physics, the chiral anomaly can occur in relativistic plasmas and plays a role in the early Universe, protoneutron stars, heavy-ion collisions, and quantum materials. It gives rise to a magnetic instability if the number densities of left- and right-handed electrically charged fermions are unequal. Using direct numerical simulations, we show this can result just from spatial fluctuations of the chemical potential, causing a chiral dynamo instability, magnetically driven turbulence, and ultimately a large-scale magnetic field through the magnetic alpha effect.
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Primordial magnetic field from chiral plasma instability with sourcing
Adding a chirality source allows the chiral plasma instability to generate helical magnetic fields below the 80 TeV erasure temperature, with a helicity estimate confirmed by 1024^3 simulations.
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