Journal of Number Theory最新文献

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Asymptotic solutions of the generalized Fermat-type equation of signature (p,p,3) over totally real number fields 完全实数域上签名为 (p,p,3) 的广义费马方程的渐近解

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-27 DOI: 10.1016/j.jnt.2025.01.020

Satyabrat Sahoo , Narasimha Kumar

In this article, we study the asymptotic solutions of the generalized Fermat-type equation of signature

(p, p, 3)

over totally real number fields K, i.e.,

A x^{p} + B y^{p} = C z^{3}

with prime exponent p and

A, B, C \in O_{K} ∖ {0}

. For certain class of fields K, we prove that

A x^{p} + B y^{p} = C z^{3}

has no asymptotic solutions over K (resp., solutions of certain type over K) with restrictions on

A, B, C

(resp., for all

A, B, C \in O_{K} ∖ {0}

). Finally, we present several local criteria over K.

引用次数: 0

On torsion subgroups of elliptic curves over quartic, quintic and sextic number fields

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-27 DOI: 10.1016/j.jnt.2025.01.017

Mustafa Umut Kazancıoğlu, Mohammad Sadek

The list of all groups that can appear as torsion subgroups of elliptic curves over number fields of degree d,

d = 4, 5, 6

, is not completely determined. However, the list of groups

Φ^{\infty} (d)

d = 4, 5, 6

, that can be realized as torsion subgroups for infinitely many non-isomorphic elliptic curves over these fields is known. We address the question of which torsion subgroups can arise over a given number field of degree d. In fact, given

G \in Φ^{\infty} (d)

and a number field K of degree d, we give explicit criteria telling whether G is realized finitely or infinitely often over K. We also give results on the field with the smallest absolute value of its discriminant such that there exists an elliptic curve with torsion G. Finally, we give examples of number fields K of degree d,

d = 4, 5, 6

, over which the Mordell-Weil rank of elliptic curves with prescribed torsion is bounded from above.

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引用次数: 0

Complex numbers with a prescribed order of approximation and Zaremba's conjecture

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-27 DOI: 10.1016/j.jnt.2024.12.010

Gerardo González Robert, Mumtaz Hussain, Nikita Shulga

Given

b = - A \pm i

with A being a positive integer, we can represent any complex number as a power series in b with coefficients in

A = {0, 1, \dots, A^{2}}

. We prove that, for any real

τ \geq 2

and any non-empty proper subset

J (b)

A

with at least two elements, there are uncountably many complex numbers (including transcendental numbers) that can be expressed as power series in b with coefficients in

J (b)

and with the irrationality exponent (in terms of Gaussian integers) equal to τ. One of the key ingredients in our construction is the ‘Folding Lemma’ applied to Hurwitz continued fractions. This motivates a Hurwitz continued fraction analogue of the well-known Zaremba's conjecture. We prove several results in support of this conjecture.

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引用次数: 0

On prime numbers and quadratic forms represented by positive-definite, primitive quadratic forms

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-27 DOI: 10.1016/j.jnt.2024.12.014

Yves Martin

In this note we show that every positive-definite, integral, primitive, n-ary quadratic form with

n \geq 2

represents infinitely many prime numbers and infinitely many primitive, non-equivalent, m-ary quadratic forms for each

2 \leq m \leq n - 1

. We do so via an inductive argument which only requires to know the statement for

n = 2

(proved by H. Weber in 1882), and elementary linear algebra. The result on the representation of prime numbers by n-ary quadratic forms for arbitrary

n > 2

can be deduced from theorems already known, but the proof below is more direct and seems to be new in the literature. As an application we establish a non-vanishing result for Fourier-Jacobi coefficients of Siegel modular forms of any degree, level and Dirichlet character, subject to a condition on the conductor of the character.

引用次数: 0

Relative sizes of iterated sumsets

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-25 DOI: 10.1016/j.jnt.2025.01.007

Noah Kravitz

Let hA denote the h-fold sumset of a subset A of an abelian group. Resolving a problem of Nathanson, we show that for any prescribed permutations

σ_{1}, \dots, σ_{H} \in S_{n}

, there exist finite subsets

A_{1}, \dots, A_{n} \subseteq Z

such that for each

1 \leq h \leq H

, the relative order of the quantities

| h A_{1} |, \dots, | h A_{n} |

is given by

σ_{h}

. We also establish extensions where

Z

is replaced by any other infinite abelian group or where one prescribes some equalities (not only inequalities) among the sumset sizes.

引用次数: 0

Upper bounds on large deviations of Dirichlet L-functions in the q-aspect

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-24 DOI: 10.1016/j.jnt.2025.01.009

Louis-Pierre Arguin, Nathan Creighton

We prove a result on the large deviations of the central values of even primitive Dirichlet L-functions with a given modulus. For

V \sim α \log \log q

with

0 < α < 1

, we show that

\frac{1}{φ (q)} # {χ even, primitive mod q : \log | L (χ, \frac{1}{2}) | > V} ≪ \frac{e^{- \frac{V^{2}}{\log \log q}}}{\sqrt{\log \log q}} .

This yields the sharp upper bound for the fractional moments of central values of Dirichlet L-functions proved by Gao, upon noting that the number of even, primitive characters with modulus q is

\frac{φ (q)}{2} + O (1)

. The proof is an adaptation to the q-aspect of the recursive scheme developed by Arguin, Bourgade and Radziwiłł for the local maxima of the Riemann zeta function, and applied by Arguin and Bailey to the large deviations in the t-aspect. We go further and get bounds on the case where

V = o (\log \log q)

. These bounds are not expected to be sharp, but the discrepancy from the Central Limit Theorem estimate grows very slowly with q. The method involves a formula for the twisted mollified second moment of central values of Dirichlet L-functions, building on the work of Iwaniec and Sarnak.

{"title":"Upper bounds on large deviations of Dirichlet L-functions in the q-aspect","authors":"Louis-Pierre Arguin, Nathan Creighton","doi":"10.1016/j.jnt.2025.01.009","DOIUrl":"10.1016/j.jnt.2025.01.009","url":null,"abstract":"<div><div>We prove a result on the large deviations of the central values of even primitive Dirichlet L-functions with a given modulus. For <math><mi>V</mi><mo>∼</mo><mi>α</mi><mi>log</mi><mo>⁡</mo><mi>log</mi><mo>⁡</mo><mi>q</mi></math> with <math><mn>0</mn><mo><</mo><mi>α</mi><mo><</mo><mn>1</mn></math>, we show that<math><mfrac><mrow><mn>1</mn></mrow><mrow><mi>φ</mi><mo>(</mo><mi>q</mi><mo>)</mo></mrow></mfrac><mi>#</mi><mrow><mo>{</mo><mi>χ</mi><mtext> even, primitive mod </mtext><mi>q</mi><mo>:</mo><mi>log</mi><mo>⁡</mo><mrow><mo>|</mo><mi>L</mi><mrow><mo>(</mo><mi>χ</mi><mo>,</mo><mfrac><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow></mfrac><mo>)</mo></mrow><mo>|</mo></mrow><mo>></mo><mi>V</mi><mo>}</mo></mrow><mspace></mspace><mo>≪</mo><mfrac><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo><mfrac><mrow><msup><mrow><mi>V</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow><mrow><mi>log</mi><mo>⁡</mo><mi>log</mi><mo>⁡</mo><mi>q</mi></mrow></mfrac></mrow></msup></mrow><mrow><msqrt><mrow><mi>log</mi><mo>⁡</mo><mi>log</mi><mo>⁡</mo><mi>q</mi></mrow></msqrt></mrow></mfrac><mo>.</mo></math> This yields the sharp upper bound for the fractional moments of central values of Dirichlet L-functions proved by Gao, upon noting that the number of even, primitive characters with modulus q is <math><mfrac><mrow><mi>φ</mi><mo>(</mo><mi>q</mi><mo>)</mo></mrow><mrow><mn>2</mn></mrow></mfrac><mo>+</mo><mi>O</mi><mo>(</mo><mn>1</mn><mo>)</mo></math>. The proof is an adaptation to the q-aspect of the recursive scheme developed by Arguin, Bourgade and Radziwiłł for the local maxima of the Riemann zeta function, and applied by Arguin and Bailey to the large deviations in the t-aspect. We go further and get bounds on the case where <math><mi>V</mi><mo>=</mo><mi>o</mi><mo>(</mo><mi>log</mi><mo>⁡</mo><mi>log</mi><mo>⁡</mo><mi>q</mi><mo>)</mo></math>. These bounds are not expected to be sharp, but the discrepancy from the Central Limit Theorem estimate grows very slowly with q. The method involves a formula for the twisted mollified second moment of central values of Dirichlet L-functions, building on the work of Iwaniec and Sarnak.</div></div>","PeriodicalId":50110,"journal":{"name":"Journal of Number Theory","volume":"273 ","pages":"Pages 96-158"},"PeriodicalIF":0.6,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511909","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

Square patterns in dynamical orbits

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-21 DOI: 10.1016/j.jnt.2024.12.004

Vefa Goksel , Giacomo Micheli

<div><div>Let q be an odd prime power. Let <math><mi>f</mi><mo>∈</mo><msub><mrow><mi>F</mi></mrow><mrow><mi>q</mi></mrow></msub><mo>[</mo><mi>x</mi><mo>]</mo></math> be a polynomial having degree at least 2, <math><mi>a</mi><mo>∈</mo><msub><mrow><mi>F</mi></mrow><mrow><mi>q</mi></mrow></msub></math>, and denote by <math><msup><mrow><mi>f</mi></mrow><mrow><mi>n</mi></mrow></msup></math> the n-th iteration of f. Let χ be the quadratic character of <math><msub><mrow><mi>F</mi></mrow><mrow><mi>q</mi></mrow></msub></math>, and <math><msub><mrow><mi>O</mi></mrow><mrow><mi>f</mi></mrow></msub><mo>(</mo><mi>a</mi><mo>)</mo></math> the forward orbit of a under iteration by f. Suppose that the sequence <math><msub><mrow><mo>(</mo><mi>χ</mi><mo>(</mo><msup><mrow><mi>f</mi></mrow><mrow><mi>n</mi></mrow></msup><mo>(</mo><mi>a</mi><mo>)</mo><mo>)</mo><mo>)</mo></mrow><mrow><mi>n</mi><mo>≥</mo><mn>1</mn></mrow></msub></math> is periodic, and m is its period. Assuming a mild and generic condition on f, we show that, up to a constant depending on d, m can be bounded from below by <math><mo>|</mo><msub><mrow><mi>O</mi></mrow><mrow><mi>f</mi></mrow></msub><mo>(</mo><mi>a</mi><mo>)</mo><mo>|</mo><mo>/</mo><msup><mrow><mi>q</mi></mrow><mrow><mfrac><mrow><mn>2</mn><msub><mrow><mi>log</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>⁡</mo><mo>(</mo><mi>d</mi><mo>)</mo><mo>+</mo><mn>1</mn></mrow><mrow><mn>2</mn><msub><mrow><mi>log</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>⁡</mo><mo>(</mo><mi>d</mi><mo>)</mo><mo>+</mo><mn>2</mn></mrow></mfrac></mrow></msup></math> as q grows. More informally, we prove that the period of the appearance of squares in an orbit of an element provides an upper bound for the size of the orbit itself. Using a similar method, we can also prove that, up to a constant depending on d, we cannot have more than <math><msup><mrow><mi>q</mi></mrow><mrow><mfrac><mrow><mn>2</mn><msub><mrow><mi>log</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>⁡</mo><mo>(</mo><mi>d</mi><mo>)</mo><mo>+</mo><mn>1</mn></mrow><mrow><mn>2</mn><msub><mrow><mi>log</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>⁡</mo><mo>(</mo><mi>d</mi><mo>)</mo><mo>+</mo><mn>2</mn></mrow></mfrac></mrow></msup></math> consecutive squares or non-squares in the forward orbit of a. In addition, using geometric tools from global function field theory such as abc theorem, we provide a classification of all polynomials for which our generic condition does not hold, making the results effective. Interestingly enough, our condition is purely geometrical, while our final results are completely arithmetical. As a corollary, this paper removes most of the hypothesis of (Ostafe, Shparlinski. Proceedings of the American Mathematical Society 138.8 (2010)), most notably extending the results to an

引用次数: 0

An asymptotic formula involving the triple divisor function

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-18 DOI: 10.1016/j.jnt.2025.01.011

Guangwei Hu , Chenran Xu

Suppose

d_{3} (n)

denotes the classical triple divisor function. Let

Q (x)

be a positive definite integral quadratic form, and

r (n, Q)

denote the number of representations of n by the quadratic form Q. In this paper, we will establish an asymptotic formula of the summation

\sum_{n \leq X} d_{3} (n + h) r (n, Q),

where h is a positive integer satisfying

h \leq H ≪ X^{1 - ε}

. Our result breaks through the trivial bound of the above summation and obtains the power saving in O-term.

引用次数: 0

Some improvements on the Davenport-Heilbronn method

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-18 DOI: 10.1016/j.jnt.2025.01.013

Konstantinos Kydoniatis

Let

k \geq 2

s \geq ⌈ k (\log k + 4.20032) ⌉

, and

λ_{1}, \dots, λ_{s}, ω \in R

. Assume that the

λ_{i}

are non-zero, not all in rational ratio, and not all of the same sign in the case that k is even. Then, for any

ϵ > 0

, the inequality

| λ_{1} x_{1}^{k} + λ_{2} x_{2}^{k} + \dots + λ_{s} x_{s}^{k} + ω | < ϵ

has

≫ P^{s - k}

integer solutions with

| x_{i} | \leq P

. Moreover the asymptotic formula for the number of smooth solutions is established assuming the same conditions hold.

引用次数: 0

Heights of rational points on Mordell curves

IF 0.6 3区数学 Q3 MATHEMATICS

Journal of Number Theory

Pub Date : 2025-02-18 DOI: 10.1016/j.jnt.2025.01.012

Alan Zhao

We conjecture a lower bound for the minimal canonical height of non-torsion rational points on a natural density 1 subset of the sextic twist family of Mordell curves. We then establish a lower bound that yields a partial result towards this conjecture.

引用次数: 0

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