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Effective description of non-equilibrium currents in cold magnetized plasma

Iqbal, Nabil (2022) 'Effective description of non-equilibrium currents in cold magnetized plasma.', SciPost physics., 12 (2). 078.

Abstract

The dynamics of cold strongly magnetized plasma -- traditionally the domain of force-free electrodynamics -- has recently been reformulated in terms of symmetries and effective field theory, where the degrees of freedom are the momentum and magnetic flux carried by a fluid of cold strings. In physical applications where the electron mass can be neglected one might expect the presence of extra light charged modes -- electrons in the lowest Landau level -- propagating parallel to the magnetic field lines. We construct an effective description of such electric charges, describing their interaction with plasma degrees of freedom in terms of a new collective mode that can be thought of as a bosonization of the electric charge density along each field line. In this framework QED phenomena such as charged pair production and the axial anomaly are described at the classical level. Formally, our construction corresponds to gauging a particular part of the higher form symmetry associated with magnetic flux conservation. We study some simple applications of our effective theory, showing that the scattering of magnetosonic modes generically creates particles and that the rotating Michel monopole is now surrounded by a cloud of electric charge.

Item Type:Article
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Available under License - Creative Commons Attribution 4.0.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.21468/SciPostPhys.12.2.078
Publisher statement:Copyright N. Iqbal. This work is licensed under the Creative Commons Attribution 4.0 International License. Published by the SciPost Foundation.
Date accepted:04 February 2022
Date deposited:22 April 2022
Date of first online publication:28 February 2022
Date first made open access:22 April 2022

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