Topological invariants for superconducting cosmic strings

Topological invariants for superconducting cosmic strings
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超导宇宙弦的拓扑不变量

DOI:
10.1142/s0217751x18501567
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发表时间:
2017-09
影响因子:
1.6
通讯作者:
Xin Liu
Xin Liu
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Xinfei Li;Xin Liu

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超导宇宙弦(SCSs)最近重新引起了人们的兴趣。在本文中,我们将闭合的超导宇宙弦视为有向的打结线缺陷,并通过研究霍普夫拓扑不变量来关注它们的拓扑结构。这个不变量是一个阿贝尔陈 - 西蒙斯作用量,从中可以构建HOMFLYPT纽结多项式。结果表明,该多项式的两个独立参数分别对应于环绕数和扭转数的贡献。这种新方法在拓扑上比传统的(自)环绕数方法更强,后者有时无法检测到纽结的本质拓扑结构,为超导宇宙弦作为一个复杂系统的物理相互关联研究提供了新的思路。
Superconducting cosmic strings (SCSs) have received revived interests recently. In this paper we treat closed SCSs as oriented knotted line defects, and concentrate on their topology by studying the Hopf topological invariant. This invariant is an Abelian Chern–Simons action, from which the HOMFLYPT knot polynomial can be constructed. It is shown that the two independent parameters of the polynomial correspond to the writhe and twist contributions, separately. This new method is topologically stronger than the traditional (self-)linking number method, which fails to detect essential topology of knots sometimes, shedding new light upon the study of physical intercommunications of superconducting cosmic strings as a complex system.
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