Natural magnetogenesis from inflation

Dimopoulos, Konstantinos and Prokopec, Tomislav and Tornkvist, Ola and Davis, Anne-Christine (2002) Natural magnetogenesis from inflation. Physical Review D, 65 (6). ISSN 1550-7998

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We consider the gravitational generation of the massive Z-boson field of the standard model, due to the natural breaking of its conformal invariance during inflation. The electroweak symmetry restoration at the end of inflation turns the almost scale-invariant superhorizon Z-spectrum into a hypermagnetic field, which transforms into a regular magnetic field at the electroweak phase transition. The mechanism is generic and is shown to generate a superhorizon spectrum of the form B~1/L on a length-scale L regardless of the choice of inflationary model. Scaled to the epoch of galaxy formation such a field suffices to trigger the galactic dynamo and explain the observed galactic magnetic fields in the case of a spatially flat, dark energy dominated Universe with GUT-scale inflation. The possibility of further amplification of the generated field by preheating is also investigated. To this end we study a model of Supersymmetric Hybrid Inflation with a Flipped SU(5) grand unified symmetry group.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
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Deposited On:
19 Jan 2009 14:23
Last Modified:
19 Sep 2023 23:59