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Crossing change on Khovanov homology and a categorified Vassiliev skein relation

Noboru Ito

http://orcid.org/0000-0001-9011-8982

Graduate School of Mathematical Sciences, The University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo, 153-8914, Japan

E-mail Address: nito@ibaraki-ct.ac.jp

Current Address: National Institute of Technology, Ibaraki College, 866 Nakane, Hitachinaka, Ibaraki, 312-8508, Japan.

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and

Jun Yoshida

http://orcid.org/0000-0002-5536-7630

Graduate School of Mathematical Sciences, The University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo, 153-8914, Japan

E-mail Address: yoshidaj@ms.u-tokyo.ac.jp

Corresponding author.

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https://doi.org/10.1142/S0218216520500510Cited by:1 (Source: Crossref)

Abstract

Khovanov homology is a categorification of the Jones polynomial, so it may be seen as a kind of quantum invariant of knots and links. Although polynomial quantum invariants are deeply involved with Vassiliev (aka. finite type) invariants, the relation remains unclear in case of Khovanov homology. Aiming at it, in this paper, we discuss a categorified version of Vassiliev skein relation on Khovanov homology. More precisely, we will show that the “genus-one” operation gives rise to a crossing change on Khovanov complexes. Invariance under Reidemeister moves turns out, and it enables us to extend Khovanov homology to singular links. We then see that a long exact sequence of Khovanov homology groups categorifies Vassiliev skein relation for the Jones polynomials. In particular, the Jones polynomial is recovered even for singular links. We in addition discuss the FI relation on Khovanov homology.

Keywords:

AMSC: 57K18, 57K16

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