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Ryu, Dongsu
Astrophysics Lab
Research Interests
  • Shock waves and turbulence in clusters of galaxies
  • Origin and evolution of magnetic fields and cosmic rays in the universe
  • Plasma astrophysical phenomena in the large-scale structure of the universe

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The First Magnetic Fields

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Title
The First Magnetic Fields
Author
Widrow, Lawrence M.Ryu, DongsuSchleicher, Dominik R. G.Subramanian, KandaswamyTsagas, Christos G.Treumann, Rudolf A.
Keywords
Early Universe; Inflation; Magnetic fields; Quark-hadron transition
Issue Date
2012-05
Publisher
SPRINGER
Citation
SPACE SCIENCE REVIEWS, v.166, no.1-4, pp.37 - 70
Abstract
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.
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DOI
10.1007/s11214-011-9833-5
ISSN
0038-6308
Appears in Collections:
PHY_Journal Papers
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