Slow decay of magnetic fields in open Friedmann universes

Details Slow decay of magnetic fields in open Friedmann universes Slow decay of magnetic fields in open Friedmann universes

2008-03-05

arxiv.org/abs/0803.0660v2

Phys.Rev.D77:107302,2008; Erratum-ibid.D77:109904,2008

Astronomy and Astrophysics

Astrophysics

Typos corrected. To appear in PRD (Brief Reports)

Scientific paper

10.1103/PhysRevD.77.109904

We describe how magnetic fields in Friedmann universes can experience superadiabatic growth without departing from conventional electromagnetism. The reason is the relativistic coupling between vector fields and spacetime geometry, which slows down the decay of large-scale magnetic fields in open universes, compared to that seen in perfectly flat models. The result is a large relative gain in magnetic strength during the pre-galactic era that can lead to astrophysically interesting B-fields, even if our universe is only marginally open today.

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