Transfer principles for Galois cohomology and Serre's conjecture II
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2023
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866911143214186496 |
|---|---|
| author | Izquierdo, Diego Arteche, Giancarlo Lucchini |
| author_facet | Izquierdo, Diego Arteche, Giancarlo Lucchini |
| contents | In this article, we prove several transfer principles for the cohomological dimension of fields. Given a fixed field $K$ with finite cohomological dimension $δ$, the two main ones allow to:
- construct totally ramified extensions of $K$ with cohomological dimension $\leq δ- 1$ when $K$ is a complete discrete valuation field;
- construct algebraic extensions of $K$ with cohomological dimension $\leq δ-1$ and satisfying a norm condition.
We then apply these results to Serre's conjecture II and to some variants for fields of any cohomological dimension that are inspired by conjectures of Kato and Kuzumaki. In particular, we prove that Serre's conjecture II for characteristic $0$ fields implies Serre's conjecture II for positive characteristic fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_00903 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Transfer principles for Galois cohomology and Serre's conjecture II Izquierdo, Diego Arteche, Giancarlo Lucchini Number Theory Algebraic Geometry K-Theory and Homology 11E72, 12G05, 12G10, 14G05, 19D45, 20G10 In this article, we prove several transfer principles for the cohomological dimension of fields. Given a fixed field $K$ with finite cohomological dimension $δ$, the two main ones allow to: - construct totally ramified extensions of $K$ with cohomological dimension $\leq δ- 1$ when $K$ is a complete discrete valuation field; - construct algebraic extensions of $K$ with cohomological dimension $\leq δ-1$ and satisfying a norm condition. We then apply these results to Serre's conjecture II and to some variants for fields of any cohomological dimension that are inspired by conjectures of Kato and Kuzumaki. In particular, we prove that Serre's conjecture II for characteristic $0$ fields implies Serre's conjecture II for positive characteristic fields. |
| title | Transfer principles for Galois cohomology and Serre's conjecture II |
| topic | Number Theory Algebraic Geometry K-Theory and Homology 11E72, 12G05, 12G10, 14G05, 19D45, 20G10 |
| url | https://arxiv.org/abs/2308.00903 |