On Cox Rings of Calabi-Yau hypersurfaces
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866910245361549312 |
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| author | Artebani, Michela Laface, Antonio Ugaglia, Luca |
| author_facet | Artebani, Michela Laface, Antonio Ugaglia, Luca |
| contents | We study the Cox rings of smooth anticanonical Calabi-Yau hypersurfaces in smooth toric Fano varieties. Using the combinatorics of primitive pairs of the ambient Fano polytope and the description of Cox rings of embedded varieties via localizations, we identify several configurations for which the hypersurface is a Mori dream space and obtain explicit presentations of its Cox ring. We also exhibit combinatorial configurations forcing the birational automorphism group to be infinite, yielding in dimensions three and four a dichotomy between finite generation of the Cox ring and infinite birational automorphism group. Finally, for a class of non-Mori dream examples, we prove the Morrison-Kawamata cone conjecture for the movable cone. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_22184 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | On Cox Rings of Calabi-Yau hypersurfaces Artebani, Michela Laface, Antonio Ugaglia, Luca Algebraic Geometry Primary 14C20, 14M25. Secondary 14J32, 14E30, 14E07, 14J28, 14Q15 We study the Cox rings of smooth anticanonical Calabi-Yau hypersurfaces in smooth toric Fano varieties. Using the combinatorics of primitive pairs of the ambient Fano polytope and the description of Cox rings of embedded varieties via localizations, we identify several configurations for which the hypersurface is a Mori dream space and obtain explicit presentations of its Cox ring. We also exhibit combinatorial configurations forcing the birational automorphism group to be infinite, yielding in dimensions three and four a dichotomy between finite generation of the Cox ring and infinite birational automorphism group. Finally, for a class of non-Mori dream examples, we prove the Morrison-Kawamata cone conjecture for the movable cone. |
| title | On Cox Rings of Calabi-Yau hypersurfaces |
| topic | Algebraic Geometry Primary 14C20, 14M25. Secondary 14J32, 14E30, 14E07, 14J28, 14Q15 |
| url | https://arxiv.org/abs/2605.22184 |