Diffusion-limited aggregation on the hyperbolic plane

Hausdorff dimension of visibility sets for well-behaved continuum percolation in the hyperbolic plane

Let Z be a so-called well-behaved percolation, i.e. a certain random closed set in the hyperbolic plane, whose law is invariant under all isometries; for example the covered region in a Poisson Boolean model. The Hausdorff-dimension of the set of directions is determined in terms of the $α$-value of Z in which visibility from a fixed point to the ideal boundary of the hyperbolic plane is possible within Z. Moreover, the Hausdorff-dimension of the set of (hyperbolic) lines through a fixed point contained in Z is calculated. Thereby several conjectures raised by Benjamini, Jonasson, Schramm and …

The hyperbolic Brownian plane

We introduce and study a new random surface which we call the hyperbolic Brownian plane and which is the near-critical scaling limit of the hyperbolic triangulations constructed in arXiv:1401.3297. The law of the hyperbolic Brownian plane is obtained after biasing the law of the Brownian plane arXiv:1204.5921 by an explicit martingale depending on its perimeter and volume processes studied in arXiv:1409.4026. Although the hyperbolic Brownian plane has the same local properties as those of the Brownian plane, its large scale structure is much different since we prove e.g. that is has exponentia…

双曲平面上硬球模型的相变

A phase transition for the hard sphere model on the hyperbolic plane

研究双曲平面上硬球模型的相变问题，通过证明得出该模型在双曲平面存在相变，解决了物理学文献中长期未证实的相关预测问题。

Right-angled hexagon tilings of the hyperbolic plane

We study isometry-invariant probability measures on the space $Ω$ of tilings of the hyperbolic plane with right-angled hexagons of varying shapes. We prove that, for each measure $μ$ in a certain natural family of measures on right-angled hexagons, there is an isometry-invariant measure on $Ω$ whose marginal distribution on tiles is $μ$.

Percolation in the Hyperbolic Plane

This is a study of percolation in the hyperbolic plane and on regular tilings in the hyperbolic plane. The processes discussed include Bernoulli site and bond percolation on planar hyperbolic graphs, invariant dependent percolations on such graphs, and Poisson-Voronoi-Bernoulli percolation. We prove the existence of three distinct nonempty phases for the Bernoulli processes. In the first phase, $p\in(0, p_c]$, there are no unbounded clusters, but there is a unique infinite cluster for the dual process. In the second phase, $p\in(p_c,p_u)$, there are infinitely many unbounded clusters for the p…

Continuous vs discrete spins in the hyperbolic plane

We study the $O(n)$ model on graphs quasi-isometric to the hyperbolic plane, with free boundary conditions. We observe that the pair correlations decay exponentially with distance, for all temperatures, if and only if $n>1$.