期刊
PHYSICS LETTERS B
卷 682, 期 4-5, 页码 484-489出版社
ELSEVIER
DOI: 10.1016/j.physletb.2009.11.017
关键词
Quantum chromodynamics; Strong magnetic fields; Chiral symmetry breaking
资金
- RFBR [06-02-04010-NNIO-a, 08-02-00661-a, 06-02-17012, 09-02-00629-a]
- DFG-RFBR [436 RUS]
- BRFBR [F08D-005]
- Russian Ministry of Industry, Science and Technology [40.052.1.1.1112]
- Russian Federal Agency for Nuclear Power
- STINT [IG2004-2 025]
- DAAD
- Belarusian Foundation for Fundamental Research [BRFBR F08D-005]
- [NSh-679.2008.2]
- [NSh-4961.2008.2]
We investigate the effect of a uniform background magnetic field on the chiral symmetry breaking in SU(2) Yang-Mills theory on the lattice. We observe that the chiral condensate grows linearly with the field strength B up to root eB = 3 GeV as predicted by chiral perturbation theory for full QCD. As the temperature increases the coefficient in front of the linear term gets smaller. In the magnetic field near-zero eigenmodes of the Dirac operator tend to have more regular structure with larger (compared to zero-field case) Hausdorff dimensionality. We suggest that the delocalization of near-zero eigenmodes plays a crucial role in the enhancement of the chiral symmetry breaking. (c) 2009 Elsevier B.V. All rights reserved.
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