拉格朗日谱和马尔可夫谱上的新空白
New gaps on the Lagrange and Markov spectra
摘要:
令$L$和$M$分别表示拉格朗日谱和马尔可夫谱。已知$L\subset M$和$M\setminus L\neq\varnothing$。在这项工作中,我们展示了新的差距$L$和$M$使用两种方法。首先,我们通过描述接近3.938的$M\setminus L$的一个新部分来推导出这样的间隙:这个区域(以及其他三个候选区域)是通过研究最近由V. Delecroix和最后两位作者制作的$L$的图片,并借助本文附录之一中解释的算法发现的。作为副产品,我们还得到了$M\setminus L$的最大已知元素,我们改进了前两位作者与M. Pollicott和P.Vytnova(在$M\setminus L$的维数上,我们得到了$0.593$的一个新的下界)。其次,我们使用一个renormalisation的想法和厚度标准(让人想起第三作者的博士论文),以检测无限多的$M$积累到弗赖曼的差距之前,所谓的霍尔射线$[4.52782956616...,\infty)\subset L$的最大差距。
英文摘要:
Let $L$ and $M$ denote the Lagrange and Markov spectra, respectively. It is known that $L\subset M$ and that $M\setminus L\neq\varnothing$. In this work, we exhibit new gaps of $L$ and $M$ using two methods. First, we derive such gaps by describing a new portion of $M\setminus L$ near to 3.938: this region (together with three other candidates) was found by investigating the pictures of $L$ recently produced by V. Delecroix and the last two authors with the aid of an algorithm explained in one of the appendices to this paper. As a by-product, we also get the largest known elements of $M\setminus L$ and we improve upon a lower bound on the Hausdorff dimension of $M\setminus L$ obtained by the last two authors together with M. Pollicott and P. Vytnova (heuristically, we get a new lower bound of $0.593$ on the dimension of $M\setminus L$). Secondly, we use a renormalisation idea and a thickness criterion (reminiscent from the third author's PhD thesis) to detect infinitely many maximal gaps of $M$ accumulating to Freiman's gap preceding the so-called Hall's ray $[4.52782956616...,\infty)\subset L$.
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