Quenched critical percolation on Galton–Watson trees

Abstract

We consider critical percolation on a supercritical Galton–Watson tree. We show that, when the offspring distribution is in the domain of attraction of an α-stable law for some $\mathit{\alpha }\in (1,2)$, or has finite variance, several annealed properties also hold in a quenched setting. In particular, the following properties hold for the critical root cluster on almost every realisation of the tree: (1) the rescaled survival probabilities converge; (2) the Yaglom limit or its stable analogue hold – in particular, conditioned on survival, the number of vertices at generation n that are connected to the root cluster rescale to certain (explicit) random variable; (3) conditioned on initial survival, the sequence of generation sizes in the root cluster rescales to a continuous–state branching process. This strengthens some earlier results of Michelen (2019) who proved (1) and (2) in the case where the initial tree has an offspring distribution with all moments finite.