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25 April 2024 |
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Article overview
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Laminar and turbulent dynamos in chiral magnetohydrodynamics. II. Simulations | | Jennifer Schober
; Igor Rogachevskii
; Axel Brandenburg
; Alexey Boyarsky
; Juerg Froehlich
; Oleg Ruchayskiy
; Nathan Kleeorin
; | | Date: |
15 Nov 2017 | | Abstract: | Using numerical simulations, we study laminar and turbulent dynamos in chiral
magnetohydrodynamics with an extended set of equations that accounts for an
additional electric current due to the chiral magnetic effect (CME). This
quantum relativistic phenomenon originates from an asymmetry between left- and
right-handed relativistic fermions in the presence of a magnetic field and
gives rise to a chiral dynamo. We show that the chiral dynamics of the magnetic
field evolution proceeds in three stages: (1) a small-scale chiral dynamo
instability; (2) production of chiral magnetically driven turbulence and
excitation of a large-scale dynamo instability due to a new chiral $alpha_mu$
effect (which is not related to kinetic helicity and becomes dominant at large
fluid and magnetic Reynolds numbers); and (3) saturation of magnetic helicity
and magnetic field growth controlled by a conservation law for the total
chirality. The growth rate of the large-scale magnetic field and its
characteristic scale measured in the numerical simulations agree well with
theoretical predictions based on mean-field theory. The previously discussed
two-stage chiral magnetic scenario did not include stage (2) during which the
characteristic scale of magnetic field variations can increase by many orders
of magnitude. Based on the findings from numerical simulations, the relevance
of the CME and the revealed new chiral effects in the relativistic plasmas of
the early Universe and of proto-neutron stars are discussed. | | Source: | arXiv, 1711.9733 | | Services: | Forum | Review | PDF | Favorites | |
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