title: Percolation on trees as a Brownian excursion: From Gaussian to Kolmogorov-Smirnov to exponential statistics.
abstract: We calculate the distribution of the size of the percolating cluster on a tree in the subcritical, critical, and supercritical phase. We do this by exploiting a mapping between continuum trees and Brownian excursions, and arrive at a diffusion equation with suitable boundary conditions. The exact solution to this equation can be conveniently represented as a characteristic function, from which the following distributions are clearly visible: Gaussian (subcritical), Kolmogorov-Smirnov (critical), and exponential (supercritical). In this way we provide an intuitive explanation for the result reported in Botet and Płoszajczak, Phys. Rev. Lett. 95, 185702 (2005)PRLTAO0031-900710.1103/PhysRevLett.95.185702 for critical percolation.
authors.affiliation: ISI Foundation, Via Alassio 11/c, 10126 Torino, Italy.
authors.forename: Francesc
authors.initials: F
authors.lastname: Font-Clos
authors.affiliation: London Mathematical Laboratory, 14 Buckingham Street, London WC2N 6DF, United Kingdom.
authors.forename: Nicholas R
authors.initials: NR
authors.lastname: Moloney