Uniqueness for a class of one-dimensional stochastic PDEs using moment duality

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For independent nearest-neighbour bond percolation on Zᵈ with d >> 6, we prove that the incipient infinite cluster's two-point function and three-point function converge to those of integrated super-Brownian excursion (ISE) in the scaling limit. The proof is based on an extension of the new expansion for percolation derived in a previous paper, and involves treating the magnetic field as a complex variable. A special case of our result for the two-point function implies that the probability that the cluster of the origin consists of n sites, at the critical point, is given by a multiple of n⁻³/², plus an error term of order n-3/2-ε with ε> 0. This is a strong statement that the critical exponent δis given by δ= 2.