arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2402.00196math.NTmath.DS
收藏

难逼近网格与 k-发散格

Badly approximable grids and k-divergent lattices

Nikolay Moshchevitin, Anurag Rao, Uri Shapira

AI总结:

本文研究矩阵 A 的难逼近目标集测度与其 Diophantine 性质的关系,分别利用转移定理、参数数的几何及齐次动力学与混合收敛,给出满测度例子和零测集条件。

摘要:

对于一个 m×n 实矩阵 A,我们研究 A 的难逼近目标集合,将其视为 m 维环面的一个子集。众所周知,该集合在稠密且具有满 Hausdorff 维数的意义上是很大的。我们研究其测度与 A 的 Diophantine 性质之间的关系。一方面,我们给出了非奇异矩阵 A 的首批例子,使得难逼近目标集合关于环面上的某个非平凡代数测度具有满测度。为此,我们使用了归功于 Jarnik 和 Khintchine 的转移定理,以及 Roy 意义下的参数数的几何。另一方面,我们对 A 给出了一个新的 Diophantine 条件,该条件略强于非奇异性,并证明在 A 满足此条件的假设下,难逼近目标集合关于环面上的任何非平凡代数测度都是零测集。为此,我们使用了朴素齐次动力学、调和分析,以及一个我们称为测度混合收敛的新概念。

英文摘要:

For an m by n real matrix A, we investigate the set of badly approximable targets for A as a subset of the m-torus. It is well known that this set is large in the sense that it is dense and has full Hausdorff dimension. We investigate the relationship between its measure and Diophantine properties of A. On the one hand, we give the first examples of a non-singular matrix A such that the set of badly approximable targets has full measure with respect to some non-trivial algebraic measure on the torus. For this, we use transference theorems due to Jarnik and Khintchine, and the parametric geometry of numbers in the sense of Roy. On the other hand, we give a novel Diophantine condition on A that slightly strengthens non-singularity, and show that under the assumption that A satisfies this condition, the set of badly approximable targets is a null-set with respect to any non-trivial algebraic measure on the torus. For this we use naive homogeneous dynamics, harmonic analysis, and a novel concept we refer to as mixing convergence of measures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑