MAGNETIC FIELDS FROM QCD PHASE TRANSITIONS

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 [mu]G a...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2012-11, Vol.759 (1), p.1-8
Main Authors: TEVZADZE, Alexander G, KISSLINGER, Leonard, BRANDENBURG, Axel, KAHNIASHVILI, Tina
Format: Article
Language:English
Subjects:
AMPLITUDES
Astronomy
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Computational fluid dynamics
COMPUTERIZED SIMULATION
CORRELATIONS
DECAY
early universe
Earth, ocean, space
Exact sciences and technology
Fluid flow
GALAXIES
HELICITY
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
Mathematical models
PHASE TRANSFORMATIONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM CHROMODYNAMICS
STAR CLUSTERS
STOCHASTIC PROCESSES
TURBULENCE
Turbulent flow
UNIVERSE
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 [mu]G 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.
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.1088/0004-637X/759/1/54