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arXiv 1602.01328math.PRmath-phmath.COmath.MP
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高次无限平面映射的几何

Geometry of infinite planar maps with high degrees

Timothy Budd, Nicolas Curien

摘要:

研究了具有高次顶点的无限随机Boltzmann平面映射的几何性质。这些对应于Boltzmann映射的一个临界权重序列$(q_{k})_{ k \geq 0}$的多项式衰减面$k^{-a}$与$a \in ( 3/2, 5/2)$,已经研究了Le Gall & Miermont以及Borot,Bouttier & Guitter。我们证明了在$a = 2$上这些映射的几何结构存在相变。在稀相对应的$a \in (2, 5/2)$,我们证明了半径为$r$(为图的距离)的球的体积是$r^{\mathsf{d}}$与$\mathsf{d}= (a-1/2)/(a-2)$,我们提供的体积和周长过程的分布标度极限。在对应于$a \in (3/2,2)$的致密相中,半径为$r$的球的体积在$r$中是指数的。我们还研究了第一次通过渗流(FPP)的距离与指数边权重,并特别表明,在稠密相的FPP距离之间的原点和无穷大是有限的。后者还意味着稠密相中的随机晶格是瞬态的。证明依赖于arXiv:1506.01590中介绍的最近的剥离过程,并在稀相中使用arXiv:1412.5509的思想。

英文摘要:

We study the geometry of infinite random Boltzmann planar maps with vertices of high degree. These correspond to the duals of the Boltzmann maps associated to a critical weight sequence $(q_{k})_{ k \geq 0}$ for the faces with polynomial decay $k^{-a}$ with $a \in ( 3/2, 5/2)$ which have been studied by Le Gall & Miermont as well as by Borot, Bouttier & Guitter. We show the existence of a phase transition for the geometry of these maps at $a = 2$. In the dilute phase corresponding to $a \in (2, 5/2)$ we prove that the volume of the ball of radius $r$ (for the graph distance) is of order $r^{\mathsf{d}}$ with $\mathsf{d}= (a-1/2)/(a-2)$, and we provide distributional scaling limits for the volume and perimeter process. In the dense phase corresponding to $a \in (3/2,2)$ the volume of the ball of radius $r$ is exponential in $r$. We also study the first-passage percolation (FPP) distance with exponential edge weights and show in particular that in the dense phase the FPP distance between the origin and infinity is finite. The latter implies in addition that the random lattices in the dense phase are transient. The proofs rely on the recent peeling process introduced in arXiv:1506.01590 and use ideas of arXiv:1412.5509 in the dilute phase.

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