The \mathrm{SL}_n-quantum trace map

Fix a n2n^2-root ω=q1/n2C{0}\omega=q^{1/n^2}\in\mathbb{C}-\{0\}. For each ideal triangulation λ\lambda of the punctured surface S\mathfrak{S}, let Snq(S)\mathscr{S}^q_n(\mathfrak{S}) be the skein algebra and Tnω(λ)\mathscr{T}_n^\omega(\lambda) the corresponding quantum torus. The SLn\mathrm{SL}_n-quantum trace map. There exists an injective algebra homomorphism

Trλω:Snq(S)\longhookrightarrowTnω(λ)\mathrm{Tr}^\omega_\lambda:\mathscr{S}^q_n(\mathfrak{S})\longhookrightarrow\mathscr{T}_n^\omega(\lambda)

such that, when q=ω=1q=\omega=1, every blackboard-framed oriented knot KK in S×(0,1)\mathfrak{S}\times(0,1) projecting to an immersed closed curve γ\gamma satisfies

Trλ1(K)=Tr~γ(Xi1/n)Tn1(λ).\mathrm{Tr}^1_\lambda(K)=\widetilde{\mathrm{Tr}}_\gamma(X_i^{1/n})\in\mathscr{T}_n^1(\lambda).

The map is intended to provide a quantum analogue of the classical trace functions, translating skein-algebra elements into the Fock–Goncharov quantum character variety. The supplied text does not state whether this conjectural formulation has been proved, so its database status remains open.

Sources & referencesView supporting material

Primary source

Daniel C. Douglas, “Quantum traces for SL_n(C): The case n=3”, arXiv:2101.06817 (2024).

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