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arXiv 2004.11350math.DG
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关于三维球面上截线的Cauchy-Riemann几何

On the Cauchy-Riemann geometry of transversal curves in the 3-sphere

Emilio Musso, Lorenzo Nicolodi, Filippo Salis

摘要:

设$\mathrm S^3$是具有标准Cauchy-Riemann(CR)结构的$\mathbb C^2$的单位球面.利用$\mathrm S^3$的局部CR不变量,研究了$\mathrm S^3$中横切于接触分布的曲线的CR几何.更具体地说,重点是横向结的CR几何形状。考虑了横结的四个全局不变量:相位反常、CR自旋、Maslov指数和CR自环绕数。这些不变量和Bennequin数之间的相互作用进行了讨论。其次,考虑一般截线的最简单CR不变变分问题,并研究其闭临界曲线。

英文摘要:

Let $\mathrm S^3$ be the unit sphere of $\mathbb C^2$ with its standard Cauchy-Riemann (CR) structure. This paper investigates the CR geometry of curves in $\mathrm S^3$ which are transversal to the contact distribution, using the local CR invariants of $\mathrm S^3$. More specifically, the focus is on the CR geometry of transversal knots. Four global invariants of transversal knots are considered: the phase anomaly, the CR spin, the Maslov index, and the CR self-linking number. The interplay between these invariants and the Bennequin number of a knot are discussed. Next, the simplest CR invariant variational problem for generic transversal curves is considered and its closed critical curves are studied.

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