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arXiv 0812.1493hep-thmath-phmath.DGmath.MP
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Faddeev-Skyrme模型中的超电流耦合

Supercurrent coupling in the Faddeev-Skyrme model

J. M. Speight

摘要:

受多分量Ginzburg-Landau理论的西格玛模型极限的启发,考虑了一个版本的Faddeev-Skyrme模型,其中标量场动态耦合到一个称为超导的单形场。这种耦合模型的研究在一般的设置,其中物理空间是一个定向黎曼流形和目标空间是Kaehler流形。结果表明,超导耦合破坏了通常的Faddeev-Skyrme模型所具有的拓扑稳定性,使得该模型中不可能存在全局稳定的结孤子。尽管如此,局部能量最小化者可能仍然存在。第一变分公式推导和用于构建三个家庭的静态解决方案的模型,所有的紧凑的域。特别地,在任意半径的三球上找到了单位电荷hopfion的耦合形式,导出了第二变分公式,并用它分析了某些解的稳定性。一个家庭的稳定的解决方案,虽然这些可能只存在于空间的偶数维。最后,证明了与非耦合模型相反,半径为R的三球面上的耦合单位hopfion对所有R都是不稳定的。这给出了一个明确的,准确的例子超导耦合不稳定的非耦合Faddeev-Skyrme模型的稳定解,并质疑的猜想Babaev,Faddeev和Niemi,结孤子应该存在于低能量制度的两个组件超导体。

英文摘要:

Motivated by the sigma model limit of multicomponent Ginzburg-Landau theory, a version of the Faddeev-Skyrme model is considered in which the scalar field is coupled dynamically to a one-form field called the supercurrent. This coupled model is investigated in the general setting where physical space is an oriented Riemannian manifold and the target space is a Kaehler manifold. It is shown that supercurrent coupling destroys the topological stability enjoyed by the usual Faddeev-Skyrme model, so that there can be no globally stable knot solitons in this model. Nonetheless, local energy minimizers may still exist. The first variation formula is derived and used to construct three families of static solutions of the model, all on compact domains. In particular, a coupled version of the unit-charge hopfion on a three-sphere of arbitrary radius is found. The second variation formula is derived, and used to analyze the stability of some of these solutions. A family of stable solutions is identified, though these may exist only in spaces of even dimension. Finally, it is shown that, in contrast to the uncoupled model, the coupled unit hopfion on the three-sphere of radius R is unstable for all R. This gives an explicit, exact example of supercurrent coupling destabilizing a stable solution of the uncoupled Faddeev-Skyrme model, and casts doubt on the conjecture of Babaev, Faddeev and Niemi that knot solitons should exist in the low-energy regime of two-component superconductors.

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