Space Science Reviews

, Volume 166, Issue 1, pp 37–70

The First Magnetic Fields


    • Department of Physics, Engineering Physics and AstronomyQueen’s University
  • Dongsu Ryu
    • Department of Astronomy and Space ScienceChungnam National University
  • Dominik R. G. Schleicher
    • Institut für AstrophysikGeorg-August-Universität
  • Kandaswamy Subramanian
    • IUCAAPune University Campus
  • Christos G. Tsagas
    • Department of PhysicsAristotle University Thessaloniki
  • Rudolf A. Treumann
    • ISSI

DOI: 10.1007/s11214-011-9833-5

Cite this article as:
Widrow, L.M., Ryu, D., Schleicher, D.R.G. et al. Space Sci Rev (2012) 166: 37. doi:10.1007/s11214-011-9833-5


We review current ideas on the origin of galactic and extragalactic magnetic fields. We begin by summarizing observations of magnetic fields at cosmological redshifts and on cosmological scales. These observations translate into constraints on the strength and scale magnetic fields must have during the early stages of galaxy formation in order to seed the galactic dynamo. We examine mechanisms for the generation of magnetic fields that operate prior during inflation and during subsequent phase transitions such as electroweak symmetry breaking and the quark–hadron phase transition. The implications of strong primordial magnetic fields for the reionization epoch as well as the first generation of stars are discussed in detail. The exotic, early-Universe mechanisms are contrasted with astrophysical processes that generate fields after recombination. For example, a Biermann-type battery can operate in a proto-galaxy during the early stages of structure formation. Moreover, magnetic fields in either an early generation of stars or active galactic nuclei can be dispersed into the intergalactic medium.


Magnetic fieldsInflationEarly UniverseQuark–hadron transition

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© Springer Science+Business Media B.V. 2011