MAGNETIC FIELDS FROM QCD PHASE TRANSITIONS

被引：67

作者：

Tevzadze, Alexander G. ^{[1
]}

Kisslinger, Leonard ^{[2
,3
]}

Brandenburg, Axel ^{[4
,5
]}

Kahniashvili, Tina ^{[2
,3
,6
,7
]}

机构：

[1] Javakhishvili Tbilisi State Univ, Fac Exact & Nat Sci, GE-0128 Tbilisi, Georgia

[2] Carnegie Mellon Univ, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA

[3] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[4] KTH Royal Inst Technol, NORDITA, SE-10691 Stockholm, Sweden

[5] Stockholm Univ, Dept Astron, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden

[6] Univ Sudbury, Dept Phys, Sudbury, ON P3E 2C, Canada

[7] Ilia State Univ, Abastumani Astrophys Observ, GE-0194 Tbilisi, Georgia

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 759卷 / 01期

基金：

美国国家科学基金会; 瑞士国家科学基金会; 瑞典研究理事会; 欧洲研究理事会;

关键词：

early universe; magnetic fields; GENERATION; TURBULENCE; RADIATION; CASCADE; LAWS;

D O I：

10.1088/0004-637X/759/1/54

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 themagnetic 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.

引用

页数：8

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