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순수물리이론 연구단
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Axion electrodynamics and magnetohydrodynamics

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Title
Axion electrodynamics and magnetohydrodynamics
Author(s)
Jai-chan Hwang; Hyerim Noh
Publication Date
2022-07
Journal
Physical Review d, v.106, no.2, pp. 023503-1 - 023503-8
Publisher
AMER PHYSICAL SOC
Abstract
We formulate axion-electrodynamics and magnetohydrodynamics (MHD) in the cosmological context assuming weak gravity. The two formulations are made for a general scalar field with general f(??)-coupling, and an axion as a massive scalar field with ??2-coupling, with the helical electromagnetic field. The ??-dynamo term appears naturally from the helical coupling in the MHD formulation. In the presence of the electromagnetic coupling, however, the Schr??dinger and hydrodynamic formulations of the coherently oscillating axion are not available for the conventional ?? coupling; instead, ??2 coupling allows successful formulations preserving the dark matter nature of the axion to nonlinear order. In the MHD formulation, direct couplings between the scalar and electromagnetic fields appear only for nonideal MHD. We study gravitational and magnetic instabilities of the scalar field and axion MHDs.
URI
https://pr.ibs.re.kr/handle/8788114/12134
DOI
10.1103/PhysRevD.106.023503
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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