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Scale-invariant helical magnetic field evolution and the duration of inflation
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0002-7304-021X
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2017 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 11, article id 002Article in journal (Refereed) Published
Abstract [en]

We consider a scale-invariant helical magnetic field generated during inflation. We show that, if the mean magnetic helicity density of such a field is measured, it can be used to determine a lower bound on the duration of inflation. Even if we just have upper bounds on the helicity, these can be used to derive constraints on the minimal duration if one assumes that the magnetic field generated during inflation is helical. Using three-dimensional simulations, we show that an initially scale-invariant field develops, which is similar both with and without magnetic helicity. In the fully helical case, however, the magnetic field appears to have a more pronounced folded structure.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2017. no 11, article id 002
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Physical Sciences
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URN: urn:nbn:se:kth:diva-220621DOI: 10.1088/1475-7516/2017/12/002ISI: 000417562300002Scopus ID: 2-s2.0-85039840529OAI: oai:DiVA.org:kth-220621DiVA, id: diva2:1173332
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QC 20180112

Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-12Bibliographically approved

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Brandenburg, Axel

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