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| Format: | Preprint |
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2026
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| Accès en ligne: | https://arxiv.org/abs/2605.12114 |
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| _version_ | 1866910212332453888 |
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| author | Cao, Peigen Huang, Min Wang, Zhihao |
| author_facet | Cao, Peigen Huang, Min Wang, Zhihao |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_12114 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantum cluster algebra realization for stated ${\rm SL}_n$-skein algebras and rotation-invariant bases for polygons Cao, Peigen Huang, Min Wang, Zhihao Quantum Algebra 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. |
| title | Quantum cluster algebra realization for stated ${\rm SL}_n$-skein algebras and rotation-invariant bases for polygons |
| topic | Quantum Algebra |
| url | https://arxiv.org/abs/2605.12114 |