Journal of Number Theory最新文献

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Reciprocity obstruction to strong approximation over p-adic function fields p-adic 函数域上强逼近的互易性障碍
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.004
Haowen Zhang
{"title":"Reciprocity obstruction to strong approximation over p-adic function fields","authors":"Haowen Zhang","doi":"10.1016/j.jnt.2024.05.004","DOIUrl":"10.1016/j.jnt.2024.05.004","url":null,"abstract":"<div><p>Over function fields of <em>p</em>-adic curves, we construct stably rational varieties in the form of homogeneous spaces of <span><math><msub><mrow><mi>SL</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span> with semisimple simply connected stabilizers and we show that strong approximation away from a non-empty set of places fails for such varieties. The construction combines the Lichtenbaum duality and the degree 3 cohomological invariants of the stabilizers. We then establish a reciprocity obstruction which accounts for this failure of strong approximation. We show that this reciprocity obstruction to strong approximation is the only one for counterexamples we constructed, and also for classifying varieties of tori. We also show that this reciprocity obstruction to strong approximation is compatible with known results for tori. At the end, we explain how a similar point of view shows that the reciprocity obstruction to weak approximation is the only one for classifying varieties of tori over <em>p</em>-adic function fields.</p></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"264 ","pages":"Pages 99-134"},"PeriodicalIF":0.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022314X24001331/pdfft?md5=cac87e78166d928ce995f053684adbf1&pid=1-s2.0-S0022314X24001331-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reductions of abelian varieties and K3 surfaces 无性变种和 K3 曲面的还原
IF 0.7 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.06.001
Ananth N. Shankar, Yunqing Tang
{"title":"Reductions of abelian varieties and K3 surfaces","authors":"Ananth N. Shankar, Yunqing Tang","doi":"10.1016/j.jnt.2024.06.001","DOIUrl":"https://doi.org/10.1016/j.jnt.2024.06.001","url":null,"abstract":"","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"29 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sparse distribution of lattice points in annular regions 环形区域中网格点的稀疏分布
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.009
Yanqiu Guo, Michael Ilyin
{"title":"Sparse distribution of lattice points in annular regions","authors":"Yanqiu Guo,&nbsp;Michael Ilyin","doi":"10.1016/j.jnt.2024.05.009","DOIUrl":"10.1016/j.jnt.2024.05.009","url":null,"abstract":"<div><p>This paper is inspired by Richards' work on large gaps between sums of two squares <span>[10]</span>. It is shown in <span>[10]</span> that there exist arbitrarily large values of <em>λ</em> and <em>μ</em>, where <span><math><mi>μ</mi><mo>≥</mo><mi>C</mi><mi>log</mi><mo>⁡</mo><mi>λ</mi></math></span>, such that intervals <span><math><mo>[</mo><mi>λ</mi><mo>,</mo><mspace></mspace><mi>λ</mi><mo>+</mo><mi>μ</mi><mo>]</mo></math></span> do not contain any sums of two squares. Geometrically, these gaps between sums of two squares correspond to annuli in <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> that do not contain any integer lattice points. A major objective of this paper is to investigate the sparse distribution of integer lattice points within annular regions in <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>. Specifically, we establish the existence of annuli <span><math><mo>{</mo><mi>x</mi><mo>∈</mo><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>:</mo><mi>λ</mi><mo>≤</mo><mo>|</mo><mi>x</mi><msup><mrow><mo>|</mo></mrow><mrow><mn>2</mn></mrow></msup><mo>≤</mo><mi>λ</mi><mo>+</mo><mi>κ</mi><mo>}</mo></math></span> with arbitrarily large <em>λ</em> and <span><math><mi>κ</mi><mo>≥</mo><mi>C</mi><msup><mrow><mi>λ</mi></mrow><mrow><mi>s</mi></mrow></msup></math></span> for <span><math><mn>0</mn><mo>&lt;</mo><mi>s</mi><mo>&lt;</mo><mfrac><mrow><mn>1</mn></mrow><mrow><mn>4</mn></mrow></mfrac></math></span>, satisfying that any two integer lattice points within any one of these annuli must be sufficiently far apart. This result is sharp, as such a property ceases to hold at and beyond the threshold <span><math><mi>s</mi><mo>=</mo><mfrac><mrow><mn>1</mn></mrow><mrow><mn>4</mn></mrow></mfrac></math></span>. Furthermore, we extend our analysis to include the sparse distribution of lattice points in spherical shells in <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>3</mn></mrow></msup></math></span>.</p></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"264 ","pages":"Pages 277-294"},"PeriodicalIF":0.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quadratic base change and resonance sums for holomorphic cusp forms on Γ0(N) Γ0(N)上全形尖顶形式的二次基变和共振和
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.011
Timothy Gillespie
{"title":"Quadratic base change and resonance sums for holomorphic cusp forms on Γ0(N)","authors":"Timothy Gillespie","doi":"10.1016/j.jnt.2024.05.011","DOIUrl":"10.1016/j.jnt.2024.05.011","url":null,"abstract":"<div><p>Let <span><math><mi>D</mi><mo>,</mo><mi>k</mi></math></span> be integers with <em>D</em> square free and <em>k</em> even. Let <em>N</em> be a positive integer so that <span><math><mo>(</mo><mi>N</mi><mo>,</mo><mi>D</mi><mo>)</mo><mo>=</mo><mn>1</mn></math></span> when <em>D</em> has residue one modulo four and <span><math><mo>(</mo><mi>N</mi><mo>,</mo><mn>4</mn><mi>D</mi><mo>)</mo><mo>=</mo><mn>1</mn></math></span> when <em>D</em> has residue two or three modulo four. In this paper the asymptotic behavior of a resonance sum <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>X</mi></mrow></msub><mo>(</mo><mi>α</mi><mo>,</mo><mi>β</mi><mo>;</mo><mi>π</mi><mo>)</mo></math></span> attached to the quadratic base change lift of a holomorphic cusp form <em>f</em> of level <em>N</em> and weight <em>k</em> over the quadratic extension generated by <span><math><msqrt><mrow><mi>D</mi></mrow></msqrt></math></span> is computed. First a Voronoi summation formula is derived that expresses <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>X</mi></mrow></msub><mo>(</mo><mi>α</mi><mo>,</mo><mi>β</mi><mo>;</mo><mi>π</mi><mo>)</mo></math></span> in terms of the Meier-G function. Then, using the known asymptotics of the Meier-G function the asymptotic behavior of <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>X</mi></mrow></msub><mo>(</mo><mi>α</mi><mo>,</mo><mi>β</mi><mo>;</mo><mi>π</mi><mo>)</mo></math></span> as <em>X</em> approaches infinity is determined. It is then shown that using only finitely many Fourier coefficients of the form, one can recover the weight <em>k</em> and the level <em>N</em>, which is a special case of the multiplicity one theorem.</p></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"264 ","pages":"Pages 184-210"},"PeriodicalIF":0.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bounds on the number of squares in recurrence sequences 递推序列中方格数的界限
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.002
Paul M. Voutier
{"title":"Bounds on the number of squares in recurrence sequences","authors":"Paul M. Voutier","doi":"10.1016/j.jnt.2024.05.002","DOIUrl":"10.1016/j.jnt.2024.05.002","url":null,"abstract":"<div><p>We investigate the number of squares in a very broad family of binary recurrence sequences with <span><math><msub><mrow><mi>u</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>=</mo><mn>1</mn></math></span>. We show that there are at most two distinct squares in such sequences (the best possible result), except under very special conditions where we prove there are at most three such squares.</p></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"265 ","pages":"Pages 291-343"},"PeriodicalIF":0.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ideal class groups of division fields of elliptic curves and everywhere unramified rational points 椭圆曲线划分域的理想类群和无处不ramified 的有理点
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.007
Naoto Dainobu
{"title":"Ideal class groups of division fields of elliptic curves and everywhere unramified rational points","authors":"Naoto Dainobu","doi":"10.1016/j.jnt.2024.05.007","DOIUrl":"10.1016/j.jnt.2024.05.007","url":null,"abstract":"<div><p>Let <em>E</em> be an elliptic curve over <span><math><mi>Q</mi></math></span>, <em>p</em> an odd prime number and <em>n</em> a positive integer. In this article, we investigate the ideal class group <span><math><mrow><mi>Cl</mi></mrow><mo>(</mo><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><msup><mrow><mi>p</mi></mrow><mrow><mi>n</mi></mrow></msup><mo>]</mo><mo>)</mo><mo>)</mo></math></span> of the <span><math><msup><mrow><mi>p</mi></mrow><mrow><mi>n</mi></mrow></msup></math></span>-division field <span><math><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><msup><mrow><mi>p</mi></mrow><mrow><mi>n</mi></mrow></msup><mo>]</mo><mo>)</mo></math></span> of <em>E</em>. We introduce a certain subgroup <span><math><mi>E</mi><msub><mrow><mo>(</mo><mi>Q</mi><mo>)</mo></mrow><mrow><mrow><mi>ur</mi></mrow><mo>,</mo><msup><mrow><mi>p</mi></mrow><mrow><mi>n</mi></mrow></msup></mrow></msub></math></span> of <span><math><mi>E</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> and study the <em>p</em>-adic valuation of the class number <span><math><mi>#</mi><mrow><mi>Cl</mi></mrow><mo>(</mo><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><msup><mrow><mi>p</mi></mrow><mrow><mi>n</mi></mrow></msup><mo>]</mo><mo>)</mo><mo>)</mo></math></span>.</p><p>In addition, when <span><math><mi>n</mi><mo>=</mo><mn>1</mn></math></span>, we further study <span><math><mrow><mi>Cl</mi></mrow><mo>(</mo><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><mi>p</mi><mo>]</mo><mo>)</mo><mo>)</mo></math></span> as a <span><math><mi>Gal</mi><mo>(</mo><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><mi>p</mi><mo>]</mo><mo>)</mo><mo>/</mo><mi>Q</mi><mo>)</mo></math></span>-module. More precisely, we study the semi-simplification <span><math><msup><mrow><mo>(</mo><mrow><mi>Cl</mi></mrow><mo>(</mo><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><mi>p</mi><mo>]</mo><mo>)</mo><mo>)</mo><mo>⊗</mo><msub><mrow><mi>Z</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>)</mo></mrow><mrow><mi>ss</mi></mrow></msup></math></span> of <span><math><mrow><mi>Cl</mi></mrow><mo>(</mo><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><mi>p</mi><mo>]</mo><mo>)</mo><mo>)</mo><mo>⊗</mo><msub><mrow><mi>Z</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span> as a <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>[</mo><mi>Gal</mi><mo>(</mo><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><mi>p</mi><mo>]</mo><mo>)</mo><mo>/</mo><mi>Q</mi><mo>)</mo><mo>]</mo></math></span>-module. We obtain a lower bound of the multiplicity of the <span><math><mi>E</mi><mo>[</mo><mi>p</mi><mo>]</mo></math></span>-component in the semi-simplification when <span><math><mi>E</mi><mo>[</mo><mi>p</mi><mo>]</mo></math></span> is an irreducible <span><math><mi>Gal</mi><mo>(</mo><mi>Q</mi><mo>(</mo><mi>E</mi><mo>[</mo><mi>p</mi><mo>]</mo><mo>)</mo><mo>/</mo><mi>Q</mi><mo>)</mo></math></span>-module.</p></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"264 ","pages":"Pages 211-232"},"PeriodicalIF":0.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Generalisations of multiple zeta values to rooted forests 多Zeta值对有根森林的泛化
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.008
Pierre J. Clavier , Dorian Perrot
{"title":"Generalisations of multiple zeta values to rooted forests","authors":"Pierre J. Clavier ,&nbsp;Dorian Perrot","doi":"10.1016/j.jnt.2024.05.008","DOIUrl":"10.1016/j.jnt.2024.05.008","url":null,"abstract":"<div><p>We show that any convergent (shuffle) arborified zeta value admits a series representation. This justifies the introduction of a new generalisation to rooted forests of multiple zeta values, and we study its algebraic properties. As a consequence of the series representation, we derive elementary proofs of some results of Bradley and Zhou for Mordell-Tornheim zeta values and give explicit formulas. The series representation for shuffle arborified zeta values also implies that they are conical zeta values. We characterise which conical zeta values are arborified zeta values and evaluate them as sums of multiple zeta values with rational coefficients.</p></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"264 ","pages":"Pages 233-276"},"PeriodicalIF":0.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multiplicative complements, II. 乘法互补,II.
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.014
{"title":"Multiplicative complements, II.","authors":"","doi":"10.1016/j.jnt.2024.05.014","DOIUrl":"10.1016/j.jnt.2024.05.014","url":null,"abstract":"<div><p>In this paper we prove that if <em>A</em> and <em>B</em> are infinite subsets of positive integers such that every positive integer <em>n</em> can be written as <span><math><mi>n</mi><mo>=</mo><mi>a</mi><mi>b</mi></math></span>, <span><math><mi>a</mi><mo>∈</mo><mi>A</mi></math></span>, <span><math><mi>b</mi><mo>∈</mo><mi>B</mi></math></span>, then <span><math><munder><mi>lim</mi><mrow><mi>x</mi><mo>→</mo><mo>∞</mo></mrow></munder><mo>⁡</mo><mfrac><mrow><mi>A</mi><mo>(</mo><mi>x</mi><mo>)</mo><mi>B</mi><mo>(</mo><mi>x</mi><mo>)</mo></mrow><mrow><mi>x</mi></mrow></mfrac><mo>=</mo><mo>∞</mo></math></span>. We present some tight density bounds in connection with multiplicative complements.</p></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"265 ","pages":"Pages 1-19"},"PeriodicalIF":0.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Primitively 2-universal senary integral quadratic forms 原始二全积分二次型
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.006
Byeong-Kweon Oh , Jongheun Yoon
{"title":"Primitively 2-universal senary integral quadratic forms","authors":"Byeong-Kweon Oh ,&nbsp;Jongheun Yoon","doi":"10.1016/j.jnt.2024.05.006","DOIUrl":"10.1016/j.jnt.2024.05.006","url":null,"abstract":"<div><p>For a positive integer <em>m</em>, a (positive definite integral) quadratic form is called primitively <em>m</em>-universal if it primitively represents all quadratic forms of rank <em>m</em>. It was proved in <span>[9]</span> that there are exactly 107 equivalence classes of primitively 1-universal quaternary quadratic forms. In this article, we prove that the minimal rank of primitively 2-universal quadratic forms is six, and there are exactly 201 equivalence classes of primitively 2-universal senary quadratic forms.</p></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"264 ","pages":"Pages 148-183"},"PeriodicalIF":0.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Consecutive runs of sums of two squares 两个平方之和的连续运行
IF 0.6 3区 数学
Journal of Number Theory Pub Date : 2024-06-25 DOI: 10.1016/j.jnt.2024.05.003
Noam Kimmel , Vivian Kuperberg
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