Geodesic
Integrality of Homfly 1–tangle invariants
Morton, H R1
1Department of Mathematical Sciences, University of Liverpool, Peach Street, Liverpool L69 7ZL, UK
Algebraic and Geometric Topology, Tome 7 (2007) no. 1, pp. 327-338
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Using spinning we analyze in a geometric way Haefliger’s smoothly knotted (4k−1)–spheres in the 6k–sphere. Consider the 2–torus standardly embedded in the 3–sphere, which is further standardly embedded in the 6–sphere. At each point of the 2–torus we have the normal disk pair: a 4–dimensional disk and a 1–dimensional proper sub-disk. We consider an isotopy (deformation) of the normal 1–disk inside the normal 4–disk, by using a map from the 2–torus to the space of long knots in 4–space, first considered by Budney. We use this isotopy in a construction called spinning about a submanifold introduced by the first-named author. Our main observation is that the resultant spun knot provides a generator of the Haefliger knot group of knotted 3–spheres in the 6–sphere. Our argument uses an explicit construction of a Seifert surface for the spun knot and works also for higher-dimensional Haefliger knots.

DOI : 10.2140/agt.2007.7.327
Keywords: Homfly, skein, annulus, quantum $sl(N)$, irreducible, integrality, 1–tangle

Morton, H R  1

1 Department of Mathematical Sciences, University of Liverpool, Peach Street, Liverpool L69 7ZL, UK 
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Morton, H R. Integrality of Homfly 1–tangle invariants. Algebraic and Geometric Topology, Tome 7 (2007) no. 1, pp. 327-338. doi: 10.2140/agt.2007.7.327

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