Asymptotic Behavior of Colored Jones polynomial and Turaev-Viro Invariant of figure eight knot

Ka Ho Wong, Thomas Kwok-Keung Au

Published 2017-11-30Version 1

In this paper we investigate the asymptotic behavior of the colored Jones polynomial and the Turaev-Viro invariant for the figure eight knot. More precisely, we consider the $M$-th colored Jones polynomial evaluated at $(N+1/2)$-th root of unity with a fixed limiting ratio, $s$, of $M$ and $(N+1/2)$. Generalizing the work of \cite{WA17} and \cite{HM13}, we obtain the asymptotic expansion formula (AEF) of the colored Jones polynomial of figure eight knot with $s$ close to $1$. An upper bound for the asymptotic expansion formula of the colored Jones polynomial of figure eight knot with $s$ close to $1/2$ is also obtained. From the result in \cite{DKY17}, the Turaev Viro invariant of figure eight knot can be expressed in terms of a sum of its colored Jones polynomials. Our results show that this sum is asymptotically equal to the sum of the terms with $s$ close to 1. As an application of the asymptotic behavior of the colored Jones polynomials, we obtain the asymptotic expansion formula for the Turaev-Viro invariant of the figure eight knot. Finally, we suggest a possible generalization of our approach so as to relate the AEF for the colored Jones polynomials and the AEF for the Turaev-Viro invariants for general hyperbolic knots.