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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.14659 |
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| _version_ | 1866917839677423616 |
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| author | Ling, Songbo Lü, Xin |
| author_facet | Ling, Songbo Lü, Xin |
| contents | Let $S$ be a minimal irregular surface of general type, whose Albanese map induces a fibration $f:\,S \to C$ of genus $g$.We prove a linear upper bound on the genus $g$ if $K_S^2\leq 4χ(\mathcal{O}_S)$. Examples are constructed showing that the above linear upper bound is sharp. We also give a characterization of the Albanese fibrations reaching the above upper bound when $χ(\mathcal{O}_S)\geq 5$.On the other hand, we will construct a sequence of surfaces $S_n$ of general type with $K_{S_n}^2/χ(\mathcal{O}_{S_n})>4$ and with an Albanese fibration $f_n$, such that the genus $g_n$ of a general fiber of $f_n$ increases quadratically with $χ(\mathcal{O}_{S_n})$,and that $K_{S_n}^2/χ(\mathcal{O}_{S_n})$ can be arbitrarily close to $4$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_14659 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Albanese fibrations of surfaces with low slope Ling, Songbo Lü, Xin Algebraic Geometry Let $S$ be a minimal irregular surface of general type, whose Albanese map induces a fibration $f:\,S \to C$ of genus $g$.We prove a linear upper bound on the genus $g$ if $K_S^2\leq 4χ(\mathcal{O}_S)$. Examples are constructed showing that the above linear upper bound is sharp. We also give a characterization of the Albanese fibrations reaching the above upper bound when $χ(\mathcal{O}_S)\geq 5$.On the other hand, we will construct a sequence of surfaces $S_n$ of general type with $K_{S_n}^2/χ(\mathcal{O}_{S_n})>4$ and with an Albanese fibration $f_n$, such that the genus $g_n$ of a general fiber of $f_n$ increases quadratically with $χ(\mathcal{O}_{S_n})$,and that $K_{S_n}^2/χ(\mathcal{O}_{S_n})$ can be arbitrarily close to $4$. |
| title | Albanese fibrations of surfaces with low slope |
| topic | Algebraic Geometry |
| url | https://arxiv.org/abs/2405.14659 |