Journal
ASTRONOMY AND ASTROPHYSICS REVIEW
Volume 21, Issue -, Pages -Publisher
SPRINGER
DOI: 10.1007/s00159-013-0062-7
Keywords
Cosmology; Magnetic fields; Early Universe; Cosmic microwave background; Gamma rays
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Funding
- Swiss National Science Foundation
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We review the possible mechanisms for the generation of cosmological magnetic fields, discuss their evolution in an expanding Universe filled with the cosmic plasma and provide a critical review of the literature on the subject. We put special emphasis on the prospects for observational tests of the proposed cosmological magnetogenesis scenarios using radio and gamma-ray astronomy and ultra-high-energy cosmic rays. We argue that primordial magnetic fields are observationally testable. They lead to magnetic fields in the intergalactic medium with magnetic field strength and correlation length in a well defined range. We also state the unsolved questions in this fascinating open problem of cosmology and propose future observations to address them.
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