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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2605.12114 |
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Inhaltsangabe:
- We construct a quantum cluster structure on the skew-field of fractions ${\rm Frac}({\mathscr S}_ω(\mathfrak{S}))$ of the stated ${\rm SL}_n$-skein algebra ${\mathscr S}_ω(\mathfrak{S})$, where $\mathfrak{S}$ is a triangulable pb surface without interior punctures. This work complements the construction for the projected stated skein algebra $\widetilde{\mathscr S}_ω(\mathfrak{S})$ given by the last two authors. Let ${\mathscr S}_ω^{\rm fr}(\mathfrak{S})$ denote the localization of ${\mathscr S}_ω(\mathfrak{S})$ at the multiplicative set generated by all frozen variables. Let ${\mathscr A}_ω^{\rm fr}(\mathfrak{S})$ and ${\mathscr U}_ω^{\rm fr}(\mathfrak{S})$ (respectively $\overline{\mathscr A}_ω(\mathfrak{S})$ and $\overline{\mathscr U}_ω(\mathfrak{S})$) denote the quantum cluster algebra and quantum upper cluster algebra associated to ${\rm Frac}({\mathscr S}_ω(\mathfrak{S}))$ (respectively ${\rm Frac}(\widetilde{\mathscr S}_ω(\mathfrak{S}))$). We prove that \[ \widetilde{\mathscr S}_ω(\mathfrak{S}) = \overline{\mathscr A}_ω(\mathfrak{S}) = \overline{\mathscr U}_ω(\mathfrak{S}) \quad \text{and} \quad {\mathscr S}_ω^{\rm fr}(\mathfrak{S}) = {\mathscr A}_ω^{\rm fr}(\mathfrak{S}) = {\mathscr U}_ω^{\rm fr}(\mathfrak{S}) \] whenever $\mathfrak{S}$ is a polygon. As a consequence, when $\mathfrak{S}$ is a polygon, we show that the theta basis of $\overline{\mathscr U}_ω(\mathfrak{S})$ (respectively ${\mathscr U}_ω^{\rm fr}(\mathfrak{S})$) yields a rotation-invariant basis of $\overline{\mathscr S}_ω(\mathfrak{S})$ (respectively ${\mathscr S}_ω^{\rm fr}(\mathfrak{S})$) with several desirable properties, including positivity and a natural parametrization.