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Evolution of hydromagnetic turbulence from the electroweak phase transition
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.ORCID iD: 0000-0002-7304-021X
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2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 12, article id 123528Article in journal (Refereed) Published
Abstract [en]

We present new simulations of decaying hydromagnetic turbulence for a relativistic equation of state relevant to the early Universe. We compare helical and nonhelical cases either with kinetically or magnetically dominated initial fields. Both kinetic and magnetic initial helicities lead to maximally helical magnetic fields after some time, but with different temporal decay laws. Both are relevant to the early Universe, although no mechanisms have yet been identified that produce magnetic helicity with strengths comparable to the big bang nucleosynthesis limit at scales comparable to the Hubble horizon at the electroweak phase transition. Nonhelical magnetically dominated fields could still produce picoGauss magnetic fields under most optimistic conditions. Only helical magnetic fields can potentially have nanoGauss strengths at scales up to 30 kpc today.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 96, no 12, article id 123528
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Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-221006DOI: 10.1103/PhysRevD.96.123528ISI: 000418658400005Scopus ID: 2-s2.0-85040166331OAI: oai:DiVA.org:kth-221006DiVA, id: diva2:1173943
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QC 20180115

Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-01-15Bibliographically approved

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Brandenburg, Axel

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