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Homotopy ribbon concordance, Blanchfield pairings, and twisted Alexander polynomials

Published online by Cambridge University Press:  12 April 2021

Stefan Friedl
Affiliation:
Department of Mathematics, University of Regensburg, Regensburg, Germany e-mail: sfriedl@gmail.com
Takahiro Kitayama
Affiliation:
Graduate School of Mathematical Sciences, The University of Tokyo, Tokyo, Japan e-mail: kitayama@ms.u-tokyo.ac.jp
Lukas Lewark*
Affiliation:
Department of Mathematics, University of Regensburg, Regensburg, Germany e-mail: sfriedl@gmail.com
Matthias Nagel
Affiliation:
Department of Mathematics, ETH Zurich, Zurich, Switzerland e-mail: matthias.nagel@math.ethz.ch
Mark Powell
Affiliation:
Department of Mathematical Sciences, Durham University, Durham, United Kingdom e-mail: mark.a.powell@durham.ac.uk
*

Abstract

We establish homotopy ribbon concordance obstructions coming from the Blanchfield form and Levine–Tristram signatures. Then, as an application of twisted Alexander polynomials, we show that for every knot K with nontrivial Alexander polynomial, there exists an infinite family of knots that are all concordant to K and have the same Blanchfield form as K, such that no pair of knots in that family is homotopy ribbon concordant.

MSC classification

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Type
Article
Copyright
© Canadian Mathematical Society 2021

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