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Slow decay of magnetic fields in open Friedmann universes · Around

2008

Slow decay of magnetic fields in open Friedmann universes

Barrow, John D., Tsagas, Christos G.

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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.

Built on

L.P. Grishchuk, Sov. Phys. JETP 40
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J.D. Barrow, in The Physical Universe: The Interface Between Cosmology, Astrophysics and Particle Physics , eds. J.D. Barrow, A. Henriques, M. Lago and M. Longair (Springer, Berlin, 1991) p. 1; C.G. Tsagas, A. Challinor and R. Maartens, preprint arXiv:0705.4397
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R. Maartens and B.A. Bassett, Class. Quantum Grav. 15
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Y.B. Zeldovich, A.A. Ruzmaikin & D.D. Sokolov, Magnetic Fields in Astrophysics (Gordon and Breach, New York, 1983); F. Krause, in The Cosmic Dynamo , eds. F. Krause, K.-H. Rädler and G. Rüdiger (Kluwer, Dordrecht, 1993); A. Brandenburg and K. Subramanian, Phys. Rep. 417
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