Cosmological Magnetic Field Generation by the Weibel Instability

Details Cosmological Magnetic Field Generation by the Weibel Instability Cosmological Magnetic Field Generation by the Weibel Instability

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...599l..57s&link_type=abstract

The Astrophysical Journal, Volume 599, Issue 2, pp. L57-L60.

Astronomy and Astrophysics

Astronomy

107

Cosmology: Theory, Cosmology: Large-Scale Structure Of Universe, Magnetic Fields, Plasmas

Scientific paper

Hydrodynamical simulations of a cold dark matter universe imply relative motion of fully ionized gaseous baryonic matter. Using the dispersion relation for the Weibel instability in unmagnetized plasmas with colliding ion-electron streams, we investigate the instability threshold conditions for the Weibel instability. The intense relative streaming is subject first to the longitudinal two-stream instability resulting in an anisotropic bi-Maxwellian electron-ion distribution function. The Weibel instability operates as a secular instability of this bi-Maxwellian in high Mach number (M>43) flows, and it generates magnetic fields as purely growing modes. The maximum cosmological field strength generated by this mechanism is 3.4×10-7 G.

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