Creation and evolution of magnetic helicity

被引：53

作者：

Jackiw, R ^{[1
]}

Pi, SY

机构：

[1] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

[2] Boston Univ, Dept Phys, Boston, MA 02215 USA

来源：

PHYSICAL REVIEW D | 2000年 / 61卷 / 10期

关键词：

D O I：

10.1103/PhysRevD.61.105015

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Projecting a non-Abelian SU(2) vacuum gauge held-a pure gauge constructed from the group element U-onto a fixed (electromagnetic) direction in isospace gives rise to a nontrivial magnetic field, with nonvanishing magnetic helicity, which coincides with the winding number of LI. Although the helicity is not conserved under Maxwell (vacuum) evolution, it retains one-half its initial value at infinite time.

引用

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