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arXiv math/0607567math.PRmath.CO
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大平面映射标度极限的拓扑结构

The topological structure of scaling limits of large planar maps

Jean-Francois Le Gall

摘要:

讨论了大二部平面映射的标度极限。若p是严格大于大于1的固定整数,我们考虑一个均匀分布在n个面的2 p-角化集上的随机平面映射M(n).然后,至少沿着一个合适的子序列,配备有图距离的度量空间M(n)在分布上收敛,因为n趋于无穷大,朝着一个极限随机紧度量空间,在Gromov-Hausdorff距离的意义下。我们证明了极限空间的拓扑是独立于p唯一确定的,并且这个空间可以作为连续统随机树对于一个等价关系的商而得到,该关系是由附着在顶点上的布朗标签定义的。我们还验证了极限的豪斯多夫维数几乎必然等于4。

英文摘要:

We discuss scaling limits of large bipartite planar maps. If p is a fixed integer strictly greater than 1, we consider a random planar map M(n) which is uniformly distributed over the set of all 2p-angulations with n faces. Then, at least along a suitable subsequence, the metric space M(n) equipped with the graph distance rescaled by the factor n to the power -1/4 converges in distribution as n tends to infinity towards a limiting random compact metric space, in the sense of the Gromov-Hausdorff distance. We prove that the topology of the limiting space is uniquely determined independently of p, and that this space can be obtained as the quotient of the Continuum Random Tree for an equivalence relation which is defined from Brownian labels attached to the vertices. We also verify that the Hausdorff dimension of the limit is almost surely equal to 4.

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