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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/3034 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/3034 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/3034 archive 131 disk0/00/00/07/72 2014-01-29 20:43:50 2015-03-27 07:08:03 2014-01-29 20:43:50 article show Tevzadze Alexander Kisslinger Leonard Brandenburg Axel Kahniashvili Tina tinatin@iliauni.edu.ge pub QB QC public We study the evolution of QCD phase transition-generated magnetic fields (MFs) in freely decaying MHD turbulence of the expanding universe. We consider an MF generation model that starts from basic non-perturbative QCD theory and predicts stochastic MFs with an amplitude of the order of 0.02 μG and small magnetic helicity. We employ direct numerical simulations to model the MHD turbulence decay and identify two different regimes: a "weakly helical" turbulence regime, when magnetic helicity increases during decay, and "fully helical" turbulence, when maximal magnetic helicity is reached and an inverse cascade develops. The results of our analysis show that in the most optimistic scenario the magnetic correlation length in the comoving frame can reach 10 kpc with the amplitude of the effective MF being 0.007 nG. We demonstrate that the considered model of magnetogenesis can provide the seed MF for galaxies and clusters. 2012 Astrophysical Journal 759 54-62 TRUE