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arXiv 1002.3682math.PR
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正亏格的随机平方的标度极限

Scaling Limits for Random Quadrangulations of Positive Genus

Jérémie Bettinelli

摘要:

讨论了正亏格的大二部四边形的标度极限。对于给定的$g$,我们考虑,对于每个$n \ge 1$,一个随机四边形$\q_n$均匀分布在所有根的二部四边形的集的亏格$g$与$n$面。通过赋予它的顶点集图距离,我们把它看作是一个度量空间。我们发现,$n$趋于无穷大,这个度量空间,与重新缩放的因子$n^{-1/4}$的距离,收敛分布,至少沿着一些子序列,朝着一个有限的随机度量空间。这种收敛在紧度量空间上的Gromov-Hausdorff拓扑意义下成立。我们表明,无论选择的子序列,豪斯多夫维数的限制空间几乎肯定等于4。我们的主要工具是由Chapuy,Marcus和Schaeffer在我们考虑的四边形和他们称之为标记良好的$g$树的对象之间引入的双射。我们研究的一个重要部分是确定后者的缩放限制。

英文摘要:

We discuss scaling limits of large bipartite quadrangulations of positive genus. For a given $g$, we consider, for every $n \ge 1$, a random quadrangulation $\q_n$ uniformly distributed over the set of all rooted bipartite quadrangulations of genus $g$ with $n$ faces. We view it as a metric space by endowing its set of vertices with the graph distance. We show that, as $n$ tends to infinity, this metric space, with distances rescaled by the factor $n^{-1/4}$, converges in distribution, at least along some subsequence, toward a limiting random metric space. This convergence holds in the sense of the Gromov-Hausdorff topology on compact metric spaces. We show that, regardless of the choice of the subsequence, the Hausdorff dimension of the limiting space is almost surely equal to 4. Our main tool is a bijection introduced by Chapuy, Marcus, and Schaeffer between the quadrangulations we consider and objects they call well-labeled $g$-trees. An important part of our study consists in determining the scaling limits of the latter.

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