Cosmological Magnetic Field: a fossil of density perturbations in the early universe

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dc.creatorIchiki, Kiyotomo
dc.creatorTakahashi, Keitaro
dc.creatorOhno, Hiroshi
dc.creatorHanayama, Hidekazu
dc.creatorSugiyama, Naoshi
dc.date2006-03-23
dc.date.accessioned2026-07-07T07:01:15Z
dc.date.available2026-07-07T07:01:15Z
dc.descriptionThe origin of the substantial magnetic fields that are found in galaxies and on even larger scales, such as in clusters of galaxies, is yet unclear. If the second-order couplings between photons and electrons are considered, then cosmological density fluctuations, which explain the large scale structure of the universe, can also produce magnetic fields on cosmological scales before the epoch of recombination. By evaluating the power spectrum of these cosmological magnetic fields on a range of scales, we show here that magnetic fields of 10^{-18.1} gauss are generated at a 1 megaparsec scale and can be even stronger at smaller scales (10^{-14.1} gauss at 10 kiloparsecpc). These fields are large enough to seed magnetic fields in galaxies and may therefore have affected primordial star formation in the early universe.
dc.description11 pages, 3 figures, accepted draft for publication in Science. Edited version and supporting online material are available at: http://www.sciencemag.org/cgi/content/abstract/311/5762/827
dc.identifierhttps://arxiv.org/abs/astro-ph/0603631
dc.identifierhttp://arxiv.org/abs/astro-ph/0603631
dc.identifierScience, Volume 311, Issue 5762, pp. 827-829 (2006)
dc.identifierdoi:10.1126/science.1120690
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108217
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCosmological Magnetic Field: a fossil of density perturbations in the early universe
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