Volume 433, Number 3, April III 2005
|Page(s)||L53 - L56|
|Published online||29 March 2005|
Letter to the Editor
Magnetic helicity and cosmological magnetic field
AHEP Group, Instituto de Fisica Corpuscular; CSIC/Universitat de Valencia, Edificio de Paterna, Apartado 22085, 46071 Valencia, Spain e-mail: firstname.lastname@example.org
2 IZMIRAN, Troitsk, Moscow Region 142190, Russia e-mail: email@example.com
3 Department of Physics, Moscow State University, Moscow 119992, Russia e-mail: firstname.lastname@example.org
Accepted: 1 March 2005
The magnetic helicity has paramount significance in the nonlinear saturation of the galactic dynamo. We argue that magnetic helicity conservation is violated at the lepton stage in the evolution of the early Universe. As a result, a cosmological magnetic field which can be a seed for the galactic dynamo obtains from the beginning a substantial magnetic helicity which has to be taken into account in the magnetic helicity balance at a later stage of the galactic dynamo.
Key words: magnetic fields / the early Universe
© ESO, 2005
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