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Statistical properties of scale-invariant helical magnetic fields and applications to cosmology
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). University of Colorado, U.S.A; Carnegie Mellon University, U.S.A..ORCID-id: 0000-0002-7304-021X
Vise andre og tillknytning
Rekke forfattare: 52018 (engelsk)Inngår i: Journal of Cosmology and Astroparticle Physics, E-ISSN 1475-7516, nr 8, artikkel-id 034Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We investigate the statistical properties of isotropic, stochastic, Gaussian distributed, helical magnetic fields characterized by different shapes of the energy spectra at large length scales and study the associated realizability condition. We discuss smoothed magnetic fields that are commonly used when the primordial magnetic field is constrained by observational data. We are particularly interested in scale-invariant magnetic fields that can be generated during the inflationary stage by quantum fluctuations. We determine the correlation length of such magnetic fields and relate it to the infrared cutoff of perturbations produced during inflation. We show that this scale determines the observational signatures of the inflationary magnetic fields on the cosmic microwave background. At smaller scales, the scale-invariant spectrum changes with time. It becomes a steeper weak-turbulence spectrum at progressively larger scales. We show numerically that the critical length scale where this happens is the turbulent-diffusive scale, which increases with the square root of time.

sted, utgiver, år, opplag, sider
2018. nr 8, artikkel-id 034
Emneord [en]
Magnetohydrodynamics, primordial magnetic fields, CMBR polarisation, physics of the early universe
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-160149DOI: 10.1088/1475-7516/2018/08/034ISI: 000442637500001OAI: oai:DiVA.org:su-160149DiVA, id: diva2:1248858
Tilgjengelig fra: 2018-09-17 Laget: 2018-09-17 Sist oppdatert: 2023-03-28bibliografisk kontrollert

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