The weak Beauville--Bogomolov decomposition in characteristic $p\geq 0$
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2019
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| _version_ | 1866917105575657472 |
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| author | Patakfalvi, Zsolt Zdanowicz, Maciej |
| author_facet | Patakfalvi, Zsolt Zdanowicz, Maciej |
| contents | We prove a variant of the Beauville--Bogomolov decomposition for weakly ordinary, or generally globally $F$-split, varieties $X$ with $K_X \sim 0$, in characteristic $p>0$. We also show that the weakly ordinary assumption in our statement cannot be dropped. Additionally, if the assumption $K_X \sim 0$ is replaced by $-K_X$ being semi-ample, we show the weaker statement that all closed fibers of the Albanese morphism are isomorphic. Finally, we apply our main theorem to draw consequences to the behavior of rational points and fundamental groups of weakly ordinary $K$-trivial varieties in positive characteristic. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1912_12742 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | The weak Beauville--Bogomolov decomposition in characteristic $p\geq 0$ Patakfalvi, Zsolt Zdanowicz, Maciej Algebraic Geometry 14G17, 14J32, 14J40, 14G05, 14E99, 14D06, We prove a variant of the Beauville--Bogomolov decomposition for weakly ordinary, or generally globally $F$-split, varieties $X$ with $K_X \sim 0$, in characteristic $p>0$. We also show that the weakly ordinary assumption in our statement cannot be dropped. Additionally, if the assumption $K_X \sim 0$ is replaced by $-K_X$ being semi-ample, we show the weaker statement that all closed fibers of the Albanese morphism are isomorphic. Finally, we apply our main theorem to draw consequences to the behavior of rational points and fundamental groups of weakly ordinary $K$-trivial varieties in positive characteristic. |
| title | The weak Beauville--Bogomolov decomposition in characteristic $p\geq 0$ |
| topic | Algebraic Geometry 14G17, 14J32, 14J40, 14G05, 14E99, 14D06, |
| url | https://arxiv.org/abs/1912.12742 |