Critical oriented percolation enhanced along random supercritical horizontal lines

Source abstract

We consider the oriented site percolation model in a random environment introduced by Kesten, Sidoravicius and Vares (2022), in which the horizontal lines of the lattice are independently declared bad or good, sites being open with a probability that depends only on the type of their line. We study the boundary case where the bad lines are critical and the good ones supercritical, so that the model is critical oriented site percolation enhanced along a random set of good lines. We prove that percolation occurs for any positive density of the good lines. An arbitrarily sparse set of arbitrarily weakly enhanced lines suffices, the density of good lines and the strength of the enhancement being decoupled. The proof adapts the renormalization scheme of Archer, Hartarsky, Kolesnik, Olesker-Taylor, Schapira and Valesin (2026). We show that the edge of the process travels at a positive speed, which yields crossing estimates for tilted boxes; during runs of bad lines, we rely on the box-crossing property of Duminil-Copin, Tassion and Teixeira (2018); and the renormalized model dominates the oriented percolation with geometric defects of Hilário, Sá, Sanchis and Teixeira (2026).