On knots, complements, and 6j-symbols

TL;DR

This paper explores the relationships between various knot homologies, quantum 6j-symbols, and deformed invariants, providing new formulas and conjectures that deepen understanding of knot theory and quantum algebra.

Contribution

It introduces a grading change rule linking HOMFLY-PT and Kauffman homologies, derives closed-form SO(N) quantum 6j-symbols, and conjectures deformed invariants for double twist knots.

Findings

A grading change rule for thin knots connecting homologies.

Closed-form expressions for SO(N) quantum 6j-symbols.

Conjectured formulas for deformed knot invariants and ADO polynomials.

Abstract

This paper investigates the relation between colored HOMFLY-PT and Kauffman homology, $\text{SO}(N)$ quantum $6j$-symbols and $(a,t)$-deformed $F_K$. First, we present a simple rule of grading change which allows us to obtain the $[r]$-colored quadruply-graded Kauffman homology from the $[r^2]$-colored quadruply-graded HOMFLY-PT homology for thin knots. This rule stems from the isomorphism of the representations $(\mathfrak{so}_6,[r]) \cong (\mathfrak{sl}_4,[r^2])$. Also, we find the relationship among $A$-polynomials of SO and SU-type coming from a differential on Kauffman homology. Second, we put forward a closed-form expression of $\text{SO}(N)(N\geq 4)$ quantum $6j$-symbols for symmetric representations, and calculate the corresponding $\text{SO}(N)$ fusion matrices for the cases when representations $R = [1],[2]$. Third, we conjecture closed-form expressions of $(a,t)$-deformed $F_K$ for the complements of double twist knots with positive braids. Using the conjectural expressions, we derive $t$-deformed ADO polynomials.