Inflation-Produced Magnetic Fields in R^n F^2 and I F^2 models

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dc.creatorCampanelli, L.
dc.creatorCea, P.
dc.creatorFogli, G. L.
dc.creatorTedesco, L.
dc.date2008-02-19
dc.date2008-05-01
dc.date.accessioned2026-07-07T11:56:09Z
dc.date.available2026-07-07T11:56:09Z
dc.descriptionWe re-analyze the production of seed magnetic fields during Inflation in (R/m^2)^n F_{μν}F^{μν} and I F_{μν}F^{μν} models, where n is a positive integer, R the Ricci scalar, m a mass parameter, and I \propto η^αa power-law function of the conformal time η, with αa positive real number. If m is the electron mass, the produced fields are uninterestingly small for all n. Taking m as a free parameter we find that, for n \geq 2, the produced magnetic fields can be sufficiently strong in order to seed dynamo mechanism and then to explain galactic magnetism. For α\gtrsim 2, there is always a window in the parameters defining Inflation such that the generated magnetic fields are astrophysically interesting. Moreover, if Inflation is (almost) de Sitter and the produced fields almost scale-invariant (α\simeq 4), their intensity can be strong enough to directly explain the presence of microgauss galactic magnetic fields.
dc.description5 pages, 2 figures. Minor revisions. References added. Accepted for publication in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0802.2630
dc.identifierhttp://arxiv.org/abs/0802.2630
dc.identifierPhys.Rev.D77:123002,2008
dc.identifierdoi:10.1103/PhysRevD.77.123002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205489
dc.subjectAstrophysics
dc.titleInflation-Produced Magnetic Fields in R^n F^2 and I F^2 models
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