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research article

Efficiency of dynamos from an autonomous generation of chiral asymmetry

Schober, Jennifer  
•
Rogachevskii, Igor
•
Brandenburg, Axel
August 15, 2024
Physical Review D

At high energies, the dynamics of a plasma with charged fermions can be described in terms of chiral magnetohydrodynamics. Using direct numerical simulations, we demonstrate that chiral magnetic waves (CMWs) can produce a chiral asymmetry μ5=μL-μR from a spatially fluctuating (inhomogeneous) chemical potential μ=μL+μR, where μL and μR are the chemical potentials of left- and right-handed electrically charged fermions, respectively. If the frequency of the CMW is less than or comparable to the characteristic growth rate of the chiral dynamo instability, the magnetic field can be amplified on small spatial scales. The growth rate of this small-scale chiral dynamo instability is determined by the spatial maximum value of μ5 fluctuations. Therefore, the magnetic field amplification occurs during periods when μ5 reaches temporal maxima during the CMW. If the small-scale chiral dynamo instability leads to a magnetic field strength that exceeds a critical value, which depends on the resistivity and the initial value of μ, magnetically dominated turbulence is produced. Turbulence gives rise to a large-scale dynamo instability, which we find to be caused by the magnetic alpha effect. Our results have consequences for the dynamics of certain high-energy plasmas, such as the early Universe.

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Type
research article
DOI
10.1103/PhysRevD.110.043515
Scopus ID

2-s2.0-85201215369

Author(s)
Schober, Jennifer  
•
Rogachevskii, Igor
•
Brandenburg, Axel
Date Issued

2024-08-15

Publisher

American Physical Society

Published in
Physical Review D
Volume

110

Issue

4

Article Number

043515

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
FunderFunding(s)Grant NumberGrant URL

NSF

AST-2307698

NASA

80NSSC22K0825

Swiss National Science Foundation

185863

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Available on Infoscience
January 24, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/243546
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