Creation and evolution of magnetic helicity

Details Creation and evolution of magnetic helicity Creation and evolution of magnetic helicity

1999-11-10

arxiv.org/abs/hep-th/9911072v2

Phys.Rev. D61 (2000) 105015

Physics

High Energy Physics

High Energy Physics - Theory

Clarifying remarks and references added; 12 pages, 1 figure using BoxedEPSF, REVTeX macros; submitted to Phys Rev D; email to

Scientific paper

10.1103/PhysRevD.61.105015

Projecting a non-Abelian SU(2) vacuum gauge field - 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 U. Although the helicity is not conserved under Maxwell (vacuum) evolution, it retains one-half its initial value at infinite time.

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