Anomalous magnetohydrodynamics in the extreme relativistic domain

Abstract

The evolution equations of anomalous magnetohydrodynamics are derived in the extreme relativistic regime and contrasted with the treatment of hydromagnetic nonlinearities pioneered by Lichnerowicz in the absence of anomalous currents. In particular we explore the situation where the conventional vector currents are complemented by the axial-vector currents arising either from the pseudo Nambu-Goldstone bosons of a spontaneously broken symmetry or because of finite fermionic density effects. After expanding the generally covariant equations in inverse powers of the conductivity, the relativistic analog of the magnetic diffusivity equation is derived in the presence of vortical and magnetic currents. While the anomalous contributions are generally suppressed by the diffusivity, they are shown to disappear in the perfectly conducting limit. When the flow is irrotational, boost-invariant and with vanishing four-acceleration the corresponding evolution equations are explicitly integrated so that the various physical regimes can be directly verified.

arXiv comment9 pages

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• Baryogenesis, magnetogenesis and the strength of anomalous interactions
• Large-scale gauge spectra and pseudoscalar couplings
• Inflationary magnetogenesis in the perturbative regime
• Chiral Anomalous Magnetohydrodynamics in action: effective field theory and holography
• Hypermagnetic knots and gravitational radiation at intermediate frequencies