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Cosmological magnetic field survival · Around

2011

Cosmological magnetic field survival

Barrow, John D., Tsagas, Christos G.

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It is widely believed that primordial magnetic fields are dramatically diluted by the expansion of the universe.

As a result, cosmological magnetic fields with residual strengths of astrophysical relevance are generally sought by going outside standard cosmology, or by extending conventional electromagnetic theory.
Nevertheless, the survival of strong B-fields of primordial origin is possible in spatially open Friedmann universes without changing conventional electromagnetism.
The reason is the hyperbolic geometry of these spacetimes, which slows down the adiabatic magnetic decay-rate and leads to their superadiabatic amplification on large scales.

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