English

Concordance invariants and the Turaev genus

Geometric Topology 2021-02-22 v2

Abstract

We show that the differences between various concordance invariants of knots, including Rasmussen's ss-invariant and its generalizations sns_n-invariants, give lower bounds to the Turaev genus of knots. Using the fact that our bounds are nontrivial for some quasi-alternating knots, we show the additivity of Turaev genus for a certain class of knots. This leads us to the first example of an infinite family of quasi-alternating knots with Turaev genus exactly gg for any fixed positive integer gg, solving a question of Champanerkar-Kofman.

Keywords

Cite

@article{arxiv.2010.00031,
  title  = {Concordance invariants and the Turaev genus},
  author = {Hongtaek Jung and Sungkyung Kang and Seungwon Kim},
  journal= {arXiv preprint arXiv:2010.00031},
  year   = {2021}
}

Comments

6 pages, 3 figures. Some references are added or corrected. More descriptions on oriented band surgeries and slice-torus invariants are added