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Energetics of turbulence generated by chiral MHD dynamos
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. University of Colorado, USA.ORCID-id: 0000-0002-7304-021X
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Ben-Gurion University of the Negev, Israel.ORCID-id: 0000-0001-7308-4768
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Ben-Gurion University of the Negev, Israel.
Antal upphovsmän: 42019 (Engelska)Ingår i: Geophysical and Astrophysical Fluid Dynamics, ISSN 0309-1929, E-ISSN 1029-0419, Vol. 113, nr 1-2, s. 107-130Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An asymmetry in the number density of left- and right-handed fermions is known to give rise to a new term in the induction equation that can result in a dynamo instability. At high temperatures, when a chiral asymmetry can survive for long enough, this chiral dynamo instability can amplify magnetic fields efficiently, which in turn drive turbulence via the Lorentz force. While it has been demonstrated in numerical simulations that this chiral magnetically driven turbulence exists and strongly affects the dynamics of the magnetic field, the details of this process remain unclear. The goal of this paper is to analyse the energetics of chiral magnetically driven turbulence and its effect on the generation and dynamics of the magnetic field using direct numerical simulations. We study these effects for different initial conditions, including a variation of the initial chiral chemical potential and the magnetic Prandtl number, . In particular, we determine the ratio of kinetic to magnetic energy, , in chiral magnetically driven turbulence. Within the parameter space explored in this study, reaches a value of approximately 0.064-0.074-independently of the initial chiral asymmetry and for . Our simulations suggest, that decreases as a power law when increasing by decreasing the viscosity. While the exact scaling depends on the details of the fitting criteria and the Reynolds number regime, an approximate result of is reported. Using the findings from our numerical simulations, we analyse the energetics of chiral magnetically driven turbulence in the early Universe.

Ort, förlag, år, upplaga, sidor
2019. Vol. 113, nr 1-2, s. 107-130
Nyckelord [en]
Relativistic magnetohydrodynamics (MHD), chiral MHD dynamos, turbulence, early universe
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:su:diva-170230DOI: 10.1080/03091929.2018.1515313ISI: 000468550900006OAI: oai:DiVA.org:su-170230DiVA, id: diva2:1330297
Tillgänglig från: 2019-06-25 Skapad: 2019-06-25 Senast uppdaterad: 2020-03-05Bibliografiskt granskad

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Brandenburg, AxelRogachevskii, Igor
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Nordiska institutet för teoretisk fysik (Nordita)Institutionen för astronomi
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Geophysical and Astrophysical Fluid Dynamics
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