{"title":"The field of moduli of sets of points in \\(\\mathbb {P}^{2}\\)","authors":"Giulio Bresciani","doi":"10.1007/s00013-024-01984-0","DOIUrl":null,"url":null,"abstract":"<div><p>For every <span>\\(n\\ge 6\\)</span>, we give an example of a finite subset of <span>\\(\\mathbb {P}^{2}\\)</span> of degree <i>n</i> which does not descend to any Brauer–Severi surface over the field of moduli. Conversely, for every <span>\\(n\\le 5\\)</span>, we prove that a finite subset of degree <i>n</i> always descends to a 0-cycle on <span>\\(\\mathbb {P}^{2}\\)</span> over the field of moduli.</p></div>","PeriodicalId":0,"journal":{"name":"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00013-024-01984-0.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"","FirstCategoryId":"100","ListUrlMain":"https://link.springer.com/article/10.1007/s00013-024-01984-0","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
For every \(n\ge 6\), we give an example of a finite subset of \(\mathbb {P}^{2}\) of degree n which does not descend to any Brauer–Severi surface over the field of moduli. Conversely, for every \(n\le 5\), we prove that a finite subset of degree n always descends to a 0-cycle on \(\mathbb {P}^{2}\) over the field of moduli.