Magnetic field amplification in cold dark matter anisotropic collapse

Marco Bruni, Roy Maartens, C. Tsagas

Research output: Contribution to journalArticlepeer-review

91 Downloads (Pure)


We use the Zel'dovich approximation to analyse the amplification of magnetic fields in gravitational collapse of cold dark matter during the mildly non-linear regime, and identify two key features. First, the anisotropy of collapse effectively eliminates one of the magnetic components, confining the field in the pancake plane. Secondly, in agreement with recent numerical simulations, we find that the shear anisotropy can amplify the magnetic field well beyond the isotropic case. Our results suggest that the magnetic strengths observed in spiral and disc galaxies today might have originated from seeds considerably weaker than previous estimates
Original languageEnglish
Pages (from-to)785-789
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 2003


Dive into the research topics of 'Magnetic field amplification in cold dark matter anisotropic collapse'. Together they form a unique fingerprint.

Cite this