Natural magnetogenesis from inflation
Aug, 2001
36 pages
Published in:
- Phys.Rev.D 65 (2002) 063505
e-Print:
- astro-ph/0108093 [astro-ph]
Report number:
- IFIC-01-38,
- HD-THEP-01-30,
- IMPERIAL-TP-0-01-23,
- DAMTP-2001-66
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Abstract: (arXiv)
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.- 98.80.Cq
- inflation: hybrid
- supersymmetry
- grand unified theory: SU(5) x U(1)
- Z0: production
- gravitation: effect
- symmetry breaking: conformal
- magnetic field: galaxy
- hypercharge
- field theory: scalar
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