{"title":"Rank stability of elliptic curves in certain non-abelian extensions","authors":"Siddhi Pathak, Anwesh Ray","doi":"10.1002/mana.202400357","DOIUrl":null,"url":null,"abstract":"<p>Let <span></span><math>\n <semantics>\n <msub>\n <mi>E</mi>\n <mrow>\n <mo>/</mo>\n <mi>Q</mi>\n </mrow>\n </msub>\n <annotation>$E_{/\\mathbb {Q}}$</annotation>\n </semantics></math> be an elliptic curve with rank <span></span><math>\n <semantics>\n <mrow>\n <mi>E</mi>\n <mo>(</mo>\n <mi>Q</mi>\n <mo>)</mo>\n <mo>=</mo>\n <mn>0</mn>\n </mrow>\n <annotation>$E(\\mathbb {Q})=0$</annotation>\n </semantics></math>. Fix an odd prime <span></span><math>\n <semantics>\n <mi>p</mi>\n <annotation>$p$</annotation>\n </semantics></math>, a positive integer <span></span><math>\n <semantics>\n <mi>n</mi>\n <annotation>$n$</annotation>\n </semantics></math>, and a finite abelian extension <span></span><math>\n <semantics>\n <mrow>\n <mi>K</mi>\n <mo>/</mo>\n <mi>Q</mi>\n </mrow>\n <annotation>$K/\\mathbb {Q}$</annotation>\n </semantics></math> with rank <span></span><math>\n <semantics>\n <mrow>\n <mi>E</mi>\n <mo>(</mo>\n <mi>K</mi>\n <mo>)</mo>\n <mo>=</mo>\n <mn>0</mn>\n </mrow>\n <annotation>$E(K) = 0$</annotation>\n </semantics></math>. In this paper, we show that there exist infinitely many extensions <span></span><math>\n <semantics>\n <mrow>\n <mi>L</mi>\n <mo>/</mo>\n <mi>K</mi>\n </mrow>\n <annotation>$L/K$</annotation>\n </semantics></math> such that <span></span><math>\n <semantics>\n <mrow>\n <mi>L</mi>\n <mo>/</mo>\n <mi>Q</mi>\n </mrow>\n <annotation>$L/\\mathbb {Q}$</annotation>\n </semantics></math> is Galois with <span></span><math>\n <semantics>\n <mrow>\n <mo>Gal</mo>\n <mrow>\n <mo>(</mo>\n <mi>L</mi>\n <mo>/</mo>\n <mi>Q</mi>\n <mo>)</mo>\n </mrow>\n <mo>≃</mo>\n <mo>Gal</mo>\n <mrow>\n <mo>(</mo>\n <mi>K</mi>\n <mo>/</mo>\n <mi>Q</mi>\n <mo>)</mo>\n </mrow>\n <mo>⋉</mo>\n <mi>Z</mi>\n <mo>/</mo>\n <msup>\n <mi>p</mi>\n <mi>n</mi>\n </msup>\n <mi>Z</mi>\n </mrow>\n <annotation>$\\operatorname{Gal}(L/\\mathbb {Q}) \\simeq \\operatorname{Gal}(K/\\mathbb {Q}) \\ltimes \\mathbb {Z}/p^n\\mathbb {Z}$</annotation>\n </semantics></math>, and rank <span></span><math>\n <semantics>\n <mrow>\n <mi>E</mi>\n <mo>(</mo>\n <mi>L</mi>\n <mo>)</mo>\n <mo>=</mo>\n <mn>0</mn>\n </mrow>\n <annotation>$E(L)=0$</annotation>\n </semantics></math>. This is an extension of earlier results on rank stability of elliptic curves in cyclic extensions of prime power order to a non-abelian setting. We also obtain an asymptotic lower bound for the number of such extensions, ordered by their absolute discriminant.</p>","PeriodicalId":49853,"journal":{"name":"Mathematische Nachrichten","volume":"298 2","pages":"730-753"},"PeriodicalIF":0.8000,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mathematische Nachrichten","FirstCategoryId":"100","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/mana.202400357","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 0
Abstract
Let be an elliptic curve with rank . Fix an odd prime , a positive integer , and a finite abelian extension with rank . In this paper, we show that there exist infinitely many extensions such that is Galois with , and rank . This is an extension of earlier results on rank stability of elliptic curves in cyclic extensions of prime power order to a non-abelian setting. We also obtain an asymptotic lower bound for the number of such extensions, ordered by their absolute discriminant.
期刊介绍:
Mathematische Nachrichten - Mathematical News publishes original papers on new results and methods that hold prospect for substantial progress in mathematics and its applications. All branches of analysis, algebra, number theory, geometry and topology, flow mechanics and theoretical aspects of stochastics are given special emphasis. Mathematische Nachrichten is indexed/abstracted in Current Contents/Physical, Chemical and Earth Sciences; Mathematical Review; Zentralblatt für Mathematik; Math Database on STN International, INSPEC; Science Citation Index