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The Turbulent Chira...
The Turbulent Chiral Magnetic Cascade in the Early Universe
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- Brandenburg, Axel (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Laboratory for Atmospheric and Space Physics, University of Colorado; JILA and Department of Astrophysical and Planetary Sciences, University of Colorado Department of Mechanical Engineering, Ben-Gurion University of the Negev,Institutionen för astronomi,Nordiska institutet för teoretisk fysik (Nordita),University of Colorado, USA
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- Schober, Jennifer (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita)
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- Rogachevskii, Igor (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Laboratory for Atmospheric and Space Physics, University of Colorado, Department of Mechanical Engineering, Ben-Gurion University of the Negev,Nordiska institutet för teoretisk fysik (Nordita),University of Colorado, USA; Ben-Gurion University of the Negev, Israel
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Kahniashvili, Tina (author)
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Boyarsky, Alexey (author)
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Frohlich, Jog (author)
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Ruchayskiy, Oleg (author)
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- Kleeorin, Nathan (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Ben-Gurion University of the Negev, Israel
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Fröhlich, Jürg (author)
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(creator_code:org_t)
- 2017-08-22
- 2017
- English.
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In: Astrophysical Journal Letters. - : IOP PUBLISHING LTD. - 2041-8205 .- 2041-8213. ; 845:2
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Subject headings
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- The presence of asymmetry between fermions of opposite handedness in plasmas of relativistic particles can lead to exponential growth of a helical magnetic field via a small-scale chiral dynamo instability known as the chiral magnetic effect. Here, we show, using dimensional arguments and numerical simulations, that this process produces through the Lorentz force chiral magnetically driven turbulence. A k(-2) magnetic energy spectrum emerges via inverse transfer over a certain range of wavenumbers k. The total chirality (magnetic helicity plus normalized chiral chemical potential) is conserved in this system. Therefore, as the helical magnetic field grows, most of the total chirality gets transferred into magnetic helicity until the chiral magnetic effect terminates. Quantitative results for height, slope, and extent of the spectrum are obtained. Consequences of this effect for cosmic magnetic fields are discussed.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- dynamo
- early universe
- magnetic fields
- magnetohydrodynamics (MHD)
- turbulence
Publication and Content Type
- ref (subject category)
- art (subject category)
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