The Brauer-Manin obstruction on algebraic stacks
Fuente:
arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866913073562910720 |
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| author | Lv, Chang Wu, Han |
| author_facet | Lv, Chang Wu, Han |
| contents | For algebraic stacks over number fields, we define their Brauer-Manin sets, Brauer-Manin pairings, and extend the descent theory of Colliot-Thélène and Sansuc. By extending Sansuc's exact sequence, we show the torsionness of Brauer groups of stacks that are locally quotients of varieties by linear groups. With mild assumptions, for stacks that are locally quotients or Deligne-Mumford, we show that the Brauer-Manin obstruction coincides with some other cohomological obstructions such as obstructions given by torsors under connected groups or abelian gerbes. For Brauer-Manin sets of these stacks, we show the properties such as descent along a torsor, product preservation are still correct. These results extend classical theories of those on varieties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_14426 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The Brauer-Manin obstruction on algebraic stacks Lv, Chang Wu, Han Algebraic Geometry Number Theory Primary 14G12, secondary 14A20, 14F22, 14F20 For algebraic stacks over number fields, we define their Brauer-Manin sets, Brauer-Manin pairings, and extend the descent theory of Colliot-Thélène and Sansuc. By extending Sansuc's exact sequence, we show the torsionness of Brauer groups of stacks that are locally quotients of varieties by linear groups. With mild assumptions, for stacks that are locally quotients or Deligne-Mumford, we show that the Brauer-Manin obstruction coincides with some other cohomological obstructions such as obstructions given by torsors under connected groups or abelian gerbes. For Brauer-Manin sets of these stacks, we show the properties such as descent along a torsor, product preservation are still correct. These results extend classical theories of those on varieties. |
| title | The Brauer-Manin obstruction on algebraic stacks |
| topic | Algebraic Geometry Number Theory Primary 14G12, secondary 14A20, 14F22, 14F20 |
| url | https://arxiv.org/abs/2306.14426 |