Nonsimple, ribbon fibered knots. (English) Zbl 0816.57007
Summary: The connected sum of an arbitrary knot and its mirror image is a ribbon knot, however the converse is not necessarily true for all ribbon knots. We prove that the converse holds for any ribbon fibered knot which is a connected sum of iterated torus knots, knots with irreducible Alexander polynomials, or cables of such knots. This gives a practical method to detect nonribbon fibered knots. The proof uses a characterization of homotopically ribbon, fibered knots by their monodromies due to Casson and Gordon. We also study when cable fibered knots are ribbon and obtain results which support the following conjecture: If a \((p,q)\) cable of a fibered knot \(k\) is ribbon where \(p\) \((>1)\) is the winding number of a cable in \(S^ 1\times D^ 2\), then \(q=\pm 1\) and \(k\) is ribbon.
MSC:
| 57M25 | Knots and links in the \(3\)-sphere (MSC2010) |
Keywords:
connected sum of knot and its mirror image; ribbon fibered knot; connected sum of iterated torus knots; knots with irreducible Alexander polynomials; cables; nonribbon fibered knots; homotopically ribbon; monodromiesReferences:
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