Analytic Conformal Blocks of $C_2$-cofinite Vertex Operator Algebras III: The Sewing-Factorization Theorems
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911455918424064 |
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| author | Gui, Bin Zhang, Hao |
| author_facet | Gui, Bin Zhang, Hao |
| contents | Let $\mathbb V=\bigoplus_{n\in\mathbb N}\mathbb V(n)$ be a $C_2$-cofinite VOA, not necessarily rational or self-dual. In this paper, we establish various versions of the sewing-factorization (SF) theorems for conformal blocks associated to grading-restricted generalized modules of $\mathbb V^{\otimes N}$ (where $N\in\mathbb N$). In addition to the versions announced in the Introduction of [GZ23], we prove the following coend version of the SF theorem:
Let $\mathfrak F$ be a compact Riemann surface with $N$ incoming and $R$ outgoing marked points, and let $\mathfrak G$ be another compact Riemann surface with $K$ incoming and $R$ outgoing marked points. Assign $\mathbb W\in\mathrm{Mod}(\mathbb V^{\otimes N})$ and $\mathbb X\in\mathrm{Mod}(\mathbb V^{\otimes K})$ to the incoming marked points of $\mathfrak F$ and $\mathfrak G$ respectively. For each $\mathbb{M} \in \mathrm{Mod}(\mathbb{V}^{\otimes R})$, assign $\mathbb{M}$ and its contragredient $\mathbb M'$ to the outgoing marked points of $\mathfrak F$ and $\mathfrak G$ respectively. Denote the corresponding spaces of conformal blocks by $\mathscr T_{\mathfrak F}^*(\mathbb M\otimes\mathbb W)$ and $\mathscr T_{\mathfrak{G}}^*(\mathbb M'\otimes\mathbb X)$. Let the $\mathfrak X$ be the $(N+K)$-pointed surface obtained by sewing $\mathfrak F$, $\mathfrak G$ along their outgoing marked points. Then the sewing of conformal blocks-proved to be convergent in [GZ25a]-yields an isomorphism of vector spaces $$\int^{\mathbb{M}\in\mathrm{Mod}(\mathbb V^{\otimes R})}\mathscr T_{\mathfrak F}^*(\mathbb M\otimes\mathbb{W})\otimes_{\mathbb C} \mathscr T_{\mathfrak G}^*(\mathbb M'\otimes \mathbb X)\simeq\mathscr T_{\mathfrak X}^*(\mathbb W\otimes \mathbb X)$$
We also discuss the relationship between conformal blocks and the modular functors defined using Lyubashenko's coend/construction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_23995 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Analytic Conformal Blocks of $C_2$-cofinite Vertex Operator Algebras III: The Sewing-Factorization Theorems Gui, Bin Zhang, Hao Quantum Algebra Mathematical Physics Representation Theory 17B69, 81T40 (Primary), 18M20 (Secondary) Let $\mathbb V=\bigoplus_{n\in\mathbb N}\mathbb V(n)$ be a $C_2$-cofinite VOA, not necessarily rational or self-dual. In this paper, we establish various versions of the sewing-factorization (SF) theorems for conformal blocks associated to grading-restricted generalized modules of $\mathbb V^{\otimes N}$ (where $N\in\mathbb N$). In addition to the versions announced in the Introduction of [GZ23], we prove the following coend version of the SF theorem: Let $\mathfrak F$ be a compact Riemann surface with $N$ incoming and $R$ outgoing marked points, and let $\mathfrak G$ be another compact Riemann surface with $K$ incoming and $R$ outgoing marked points. Assign $\mathbb W\in\mathrm{Mod}(\mathbb V^{\otimes N})$ and $\mathbb X\in\mathrm{Mod}(\mathbb V^{\otimes K})$ to the incoming marked points of $\mathfrak F$ and $\mathfrak G$ respectively. For each $\mathbb{M} \in \mathrm{Mod}(\mathbb{V}^{\otimes R})$, assign $\mathbb{M}$ and its contragredient $\mathbb M'$ to the outgoing marked points of $\mathfrak F$ and $\mathfrak G$ respectively. Denote the corresponding spaces of conformal blocks by $\mathscr T_{\mathfrak F}^*(\mathbb M\otimes\mathbb W)$ and $\mathscr T_{\mathfrak{G}}^*(\mathbb M'\otimes\mathbb X)$. Let the $\mathfrak X$ be the $(N+K)$-pointed surface obtained by sewing $\mathfrak F$, $\mathfrak G$ along their outgoing marked points. Then the sewing of conformal blocks-proved to be convergent in [GZ25a]-yields an isomorphism of vector spaces $$\int^{\mathbb{M}\in\mathrm{Mod}(\mathbb V^{\otimes R})}\mathscr T_{\mathfrak F}^*(\mathbb M\otimes\mathbb{W})\otimes_{\mathbb C} \mathscr T_{\mathfrak G}^*(\mathbb M'\otimes \mathbb X)\simeq\mathscr T_{\mathfrak X}^*(\mathbb W\otimes \mathbb X)$$ We also discuss the relationship between conformal blocks and the modular functors defined using Lyubashenko's coend/construction. |
| title | Analytic Conformal Blocks of $C_2$-cofinite Vertex Operator Algebras III: The Sewing-Factorization Theorems |
| topic | Quantum Algebra Mathematical Physics Representation Theory 17B69, 81T40 (Primary), 18M20 (Secondary) |
| url | https://arxiv.org/abs/2503.23995 |