双重切片结的新障碍
New obstructions to doubly slicing knots
摘要：
3-球面中的一个纽结称为双片，如果它是4-球面中一个未纽结的2-球面的片。本文给出了双切片纽结的一个新的双障碍序列。我们构造它遵循的Cochran-Orr-Teichner的过滤的经典纽结和谐群的思想。这产生了一个由半整数对索引的结幺半群的双过滤（在连接和运算下）。双切片结位于该双向过滤的交叉点。我们构建的例子，说明非平凡的这种双过滤在各个层面上的结。特别地，这些是代数上双切片结的新例子，它们不是双切片的，而且其中许多结是切片的。Cheeger-Gromov的von Neumann rho不变量在证明这种双过滤的非平凡性方面起着关键作用。我们还表明，一些经典的不变量反映在这个双过滤的初始水平，并获得双一致群的双过滤。
英文摘要：
A knot in the 3-sphere is called doubly slice if it is a slice of an unknotted 2-sphere in the 4-sphere. We give a bi-sequence of new obstructions for a knot being doubly slice. We construct it following the idea of Cochran-Orr-Teichner's filtration of the classical knot concordance group. This yields a bi-filtration of the monoid of knots (under the connected sum operation) indexed by pairs of half integers. Doubly slice knots lie in the intersection of this bi-filtration. We construct examples of knots which illustrate non-triviality of this bi-filtration at all levels. In particular, these are new examples of algebraically doubly slice knots that are not doubly slice, and many of these knots are slice. Cheeger-Gromov's von Neumann rho invariants play a key role to show non-triviality of this bi-filtration. We also show that some classical invariants are reflected at the initial levels of this bi-filtration, and obtain a bi-filtration of the double concordance group.
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