Asymptotics of quantum invariants of surface diffeomorphisms II: The figure-eight knot complement

Abstract: In earlier work, the authors introduced a conjecture which, for an orientation-preserving diffeomorphism $\varphi \colon S \to S$ of a surface, connects a certain quantum invariant of $\varphi$ with the hyperbolic volume of its mapping torus $M_\varphi$. This article provides a proof of this conjecture in the simplest case where it applies, namely when the surface $S$ is the one-puncture torus and the mapping torus $M_\varphi$ is the complement of the figure-eight knot.