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Iterated toric descent obstruction and homogeneous spaces over geometric global fields
Abstract
We study torsors under tori and groups of multiplicative type together with the obstruction they define to the existence of rational points in the setting of geometric global fields. Our methods give two new arithmetic applications: the iterated toric descent obstruction coincides with the toric decent obstruction and the toric obstruction is the only obstruction to the existence of rational points for homogeneous spaces of connected linear groups with either connected or abelian geometric stabilizers. These applications generalize some known results for classical global fields, due to Borovoi, Colliot-Thélène, and Sansuc, while exhibiting novel behaviors.
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BibTeX
@misc{gambardella2026iterated,
title = {{Iterated toric descent obstruction and homogeneous spaces over geometric global fields}},
author = {Felipe Gambardella and Nguyen Manh Linh},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41573},
eprint = {2610.41573},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41573},
}
RIS
TY - UNPB
TI - Iterated toric descent obstruction and homogeneous spaces over geometric global fields
AU - Felipe Gambardella
AU - Nguyen Manh Linh
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41573
UR - https://arxiv.org/abs/2610.41573
AB - We study torsors under tori and groups of multiplicative type together with the obstruction they define to the existence of rational points in the setting of geometric global fields. Our methods give two new arithmetic applications: the iterated toric descent obstruction coincides with the toric decent obstruction and the toric obstruction is the only obstruction to the existence of rational points for homogeneous spaces of connected linear groups with either connected or abelian geometric stabilizers. These applications generalize some known results for classical global fields, due to Borovoi, Colliot-Thélène, and Sansuc, while exhibiting novel behaviors.
ER -