Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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GENERATION OF MAGNETIC FIELDS IN COSMOLOGICAL SHOCKS

  • MEDVEDEV MIKHAIL V. (Department of Physics and Astronomy, University of Kansas, Institute for Nuclear Fusion, RRC 'Kurchatov Institute') ;
  • SILVA LUIS O. (GoLP/Centro de Fisica de Plasmas, Instituto Superior Tecnico) ;
  • FIORE MASSIMILIANO (GoLP/Centro de Fisica de Plasmas, Instituto Superior Tecnico) ;
  • FONSECA RICARDO A. (GoLP/Centro de Fisica de Plasmas, Instituto Superior Tecnico) ;
  • MORI WARREN B. (Department of Physics and Astronomy, University of California)
  • Published : 2004.12.01
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Abstract

The origin of magnetic fields in the universe remains an outstanding problem in cosmology. We propose that these fields are produced by shocks during the large-scale structure formation. We discuss the mechanism of the field generation via the counter-streaming (Weibel) instability. We also show that these Weibel-generated fields are long-lived and weakly coupled to dissipation. Subsequent field amplification by the intra-cluster turbulence may also take place, thus maintaining the magnetic energy density close to equipartition.

Keywords

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