A holographic bound on cosmic magnetic fields
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Publication:901973
DOI10.1016/J.NUCLPHYSB.2014.12.028zbMATH Open1328.83204arXiv1409.3663OpenAlexW2039663564MaRDI QIDQ901973
Author name not available (Why is that?)
Publication date: 6 January 2016
Published in: (Search for Journal in Brave)
Abstract: Magnetic fields large enough to be observable are ubiquitous in astrophysics, even at extremely large length scales. This has led to the suggestion that such fields are seeded at very early (inflationary) times, and subsequently amplified by various processes involving, for example, dynamo effects. Many such mechanisms give rise to extremely large magnetic fields at the end of inflationary reheating, and therefore also during the quark-gluon plasma epoch of the early universe. Such plasmas have a well-known holographic description in terms of a thermal asymptotically AdS black hole. We show that holography imposes an upper bound on the intensity of magnetic fields ( at the hadronization temperature) in these circumstances; this is above, but not far above, the values expected in some models of cosmic magnetogenesis.
Full work available at URL: https://arxiv.org/abs/1409.3663
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