kth.sePublications KTH
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Efficiency of dynamos from an autonomous generation of chiral asymmetry
Institute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), 1290 Sauverny, Switzerland.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel; Nordita, Stockholm University, 10691 Stockholm, Sweden.ORCID iD: 0000-0001-7308-4768
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Nordita, Stockholm University, 10691 Stockholm, Sweden; The Oskar Klein Centre, Department of Astronomy, Stockholm University, AlbaNova, SE-10691 Stockholm, Sweden; School of Natural Sciences and Medicine, Ilia State University, 0194 Tbilisi, Georgia; McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.ORCID iD: 0000-0002-7304-021X
2024 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 110, no 4, article id 043515Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2024. Vol. 110, no 4, article id 043515
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-352365DOI: 10.1103/PhysRevD.110.043515ISI: 001291139500009Scopus ID: 2-s2.0-85201215369OAI: oai:DiVA.org:kth-352365DiVA, id: diva2:1893073
Note

QC 20240905

Available from: 2024-08-28 Created: 2024-08-28 Last updated: 2024-09-05Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Rogachevskii, IgorBrandenburg, Axel

Search in DiVA

By author/editor
Rogachevskii, IgorBrandenburg, Axel
By organisation
Nordic Institute for Theoretical Physics NORDITA
In the same journal
Physical Review D: covering particles, fields, gravitation, and cosmology
Subatomic Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 68 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf