{"title":"Stably irrational hypersurfaces of small slopes","authors":"Stefan Schreieder","doi":"10.1090/jams/928","DOIUrl":null,"url":null,"abstract":"<p>Let <inline-formula content-type=\"math/mathml\">\n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"k\">\n <mml:semantics>\n <mml:mi>k</mml:mi>\n <mml:annotation encoding=\"application/x-tex\">k</mml:annotation>\n </mml:semantics>\n</mml:math>\n</inline-formula> be an uncountable field of characteristic different from two. We show that a very general hypersurface <inline-formula content-type=\"math/mathml\">\n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper X subset-of double-struck upper P Subscript k Superscript upper N plus 1\">\n <mml:semantics>\n <mml:mrow>\n <mml:mi>X</mml:mi>\n <mml:mo>⊂<!-- ⊂ --></mml:mo>\n <mml:msubsup>\n <mml:mrow class=\"MJX-TeXAtom-ORD\">\n <mml:mi mathvariant=\"double-struck\">P</mml:mi>\n </mml:mrow>\n <mml:mi>k</mml:mi>\n <mml:mrow class=\"MJX-TeXAtom-ORD\">\n <mml:mi>N</mml:mi>\n <mml:mo>+</mml:mo>\n <mml:mn>1</mml:mn>\n </mml:mrow>\n </mml:msubsup>\n </mml:mrow>\n <mml:annotation encoding=\"application/x-tex\">X\\subset \\mathbb {P}^{N+1}_k</mml:annotation>\n </mml:semantics>\n</mml:math>\n</inline-formula> of dimension <inline-formula content-type=\"math/mathml\">\n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"upper N greater-than-or-equal-to 3\">\n <mml:semantics>\n <mml:mrow>\n <mml:mi>N</mml:mi>\n <mml:mo>≥<!-- ≥ --></mml:mo>\n <mml:mn>3</mml:mn>\n </mml:mrow>\n <mml:annotation encoding=\"application/x-tex\">N\\geq 3</mml:annotation>\n </mml:semantics>\n</mml:math>\n</inline-formula> and degree at least <inline-formula content-type=\"math/mathml\">\n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"log Subscript 2 Baseline upper N plus 2\">\n <mml:semantics>\n <mml:mrow>\n <mml:msub>\n <mml:mi>log</mml:mi>\n <mml:mn>2</mml:mn>\n </mml:msub>\n <mml:mo><!-- --></mml:mo>\n <mml:mi>N</mml:mi>\n <mml:mo>+</mml:mo>\n <mml:mn>2</mml:mn>\n </mml:mrow>\n <mml:annotation encoding=\"application/x-tex\">\\log _2N +2</mml:annotation>\n </mml:semantics>\n</mml:math>\n</inline-formula> is not stably rational over the algebraic closure of <inline-formula content-type=\"math/mathml\">\n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" alttext=\"k\">\n <mml:semantics>\n <mml:mi>k</mml:mi>\n <mml:annotation encoding=\"application/x-tex\">k</mml:annotation>\n </mml:semantics>\n</mml:math>\n</inline-formula>.</p>","PeriodicalId":54764,"journal":{"name":"Journal of the American Mathematical Society","volume":" ","pages":""},"PeriodicalIF":3.5000,"publicationDate":"2018-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1090/jams/928","citationCount":"59","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Mathematical Society","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.1090/jams/928","RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 59
Abstract
Let kk be an uncountable field of characteristic different from two. We show that a very general hypersurface X⊂PkN+1X\subset \mathbb {P}^{N+1}_k of dimension N≥3N\geq 3 and degree at least log2N+2\log _2N +2 is not stably rational over the algebraic closure of kk.
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