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Primordial magnetic fields and causality

May, 2003
4 pages
Published in:
  • JCAP 11 (2003) 010
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2003200920152021202505101520
Abstract: (arXiv)
We discuss the implications of causality on a primordial magnetic field. We show that the residual field on large scales is much more suppressed than usually assumed and that a helical component is even more reduced. Due to this strong suppression, even maximal primordial fields generated at the electroweak phase transition can just marginally seed the fields in clusters, but they cannot leave any detectable imprint on the cosmic microwave background.
Note:
  • New version accepted for publication in JCAP, modified and improved, conclusions unchanged
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