fast dynamo

Cosmological Magnetohydrodynamics

The origin of cosmological magnetic fields is an unresolved issue. Most scenarios for a primordial origin of these fields predict most power on microscopic scales, but very weak fields on cosmologically relevant scales. In this case, observed large scale and galactic fields would have to have either a secondary origin, for example from battery effects, or one has to assume that primordial fields were enhanced by dynamo effects.

However, parity-odd interactions which are present in certain particle physics scenarios and also in string theory can lead to injection of magnetic helicity. In combination with a dynamo acting on small scales some of the magnetic energy originally produced at microscopic scales can cascade to large scales where it may lead to observable effects or be dissipated. I am working on quantitative calculations of such effects.

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