{"title":"Uniform bounds for the density in Artin's conjecture on primitive roots","authors":"Antonella Perucca, Igor E. Shparlinski","doi":"10.1112/blms.70011","DOIUrl":null,"url":null,"abstract":"<p>We consider Artin's conjecture on primitive roots over a number field <span></span><math>\n <semantics>\n <mi>K</mi>\n <annotation>$K$</annotation>\n </semantics></math>, reducing an algebraic number <span></span><math>\n <semantics>\n <mrow>\n <mi>α</mi>\n <mo>∈</mo>\n <msup>\n <mi>K</mi>\n <mo>×</mo>\n </msup>\n </mrow>\n <annotation>$\\alpha \\in K^\\times$</annotation>\n </semantics></math>. Under the Generalised Riemann Hypothesis, there is a density <span></span><math>\n <semantics>\n <mrow>\n <mo>dens</mo>\n <mo>(</mo>\n <mi>α</mi>\n <mo>)</mo>\n </mrow>\n <annotation>$\\operatorname{dens}(\\alpha)$</annotation>\n </semantics></math> counting the proportion of the primes of <span></span><math>\n <semantics>\n <mi>K</mi>\n <annotation>$K$</annotation>\n </semantics></math> for which <span></span><math>\n <semantics>\n <mi>α</mi>\n <annotation>$\\alpha$</annotation>\n </semantics></math> is a primitive root. This density <span></span><math>\n <semantics>\n <mrow>\n <mo>dens</mo>\n <mo>(</mo>\n <mi>α</mi>\n <mo>)</mo>\n </mrow>\n <annotation>$\\operatorname{dens}(\\alpha)$</annotation>\n </semantics></math> is a rational multiple of an Artin constant <span></span><math>\n <semantics>\n <mrow>\n <mi>A</mi>\n <mo>(</mo>\n <mi>τ</mi>\n <mo>)</mo>\n </mrow>\n <annotation>$A(\\tau)$</annotation>\n </semantics></math> that depends on the largest integer <span></span><math>\n <semantics>\n <mrow>\n <mi>τ</mi>\n <mo>⩾</mo>\n <mn>1</mn>\n </mrow>\n <annotation>$\\tau \\geqslant 1$</annotation>\n </semantics></math> such that <span></span><math>\n <semantics>\n <mrow>\n <mi>α</mi>\n <mo>∈</mo>\n <msup>\n <mfenced>\n <msup>\n <mi>K</mi>\n <mo>×</mo>\n </msup>\n </mfenced>\n <mi>τ</mi>\n </msup>\n </mrow>\n <annotation>$\\alpha \\in {\\left(K^\\times \\right)}^\\tau$</annotation>\n </semantics></math>. The aim of this paper is bounding the ratio <span></span><math>\n <semantics>\n <mrow>\n <mo>dens</mo>\n <mo>(</mo>\n <mi>α</mi>\n <mo>)</mo>\n <mo>/</mo>\n <mi>A</mi>\n <mo>(</mo>\n <mi>τ</mi>\n <mo>)</mo>\n </mrow>\n <annotation>$\\operatorname{dens}(\\alpha)/A(\\tau)$</annotation>\n </semantics></math>, under the assumption that <span></span><math>\n <semantics>\n <mrow>\n <mo>dens</mo>\n <mo>(</mo>\n <mi>α</mi>\n <mo>)</mo>\n <mo>≠</mo>\n <mn>0</mn>\n </mrow>\n <annotation>$\\operatorname{dens}(\\alpha)\\ne 0$</annotation>\n </semantics></math>. Over <span></span><math>\n <semantics>\n <mi>Q</mi>\n <annotation>$\\mathbb {Q}$</annotation>\n </semantics></math>, this ratio is between <span></span><math>\n <semantics>\n <mrow>\n <mn>2</mn>\n <mo>/</mo>\n <mn>3</mn>\n </mrow>\n <annotation>$2/3$</annotation>\n </semantics></math> and 2, these bounds being optimal. For a general number field <span></span><math>\n <semantics>\n <mi>K</mi>\n <annotation>$K$</annotation>\n </semantics></math>, we provide upper and lower bounds that only depend on <span></span><math>\n <semantics>\n <mi>K</mi>\n <annotation>$K$</annotation>\n </semantics></math>.</p>","PeriodicalId":55298,"journal":{"name":"Bulletin of the London Mathematical Society","volume":"57 3","pages":"978-991"},"PeriodicalIF":0.8000,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1112/blms.70011","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the London Mathematical Society","FirstCategoryId":"100","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1112/blms.70011","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
We consider Artin's conjecture on primitive roots over a number field , reducing an algebraic number . Under the Generalised Riemann Hypothesis, there is a density counting the proportion of the primes of for which is a primitive root. This density is a rational multiple of an Artin constant that depends on the largest integer such that . The aim of this paper is bounding the ratio , under the assumption that . Over , this ratio is between and 2, these bounds being optimal. For a general number field , we provide upper and lower bounds that only depend on .