We consider invasion percolation on the square lattice. van den Berg, Peres, Sidoravicius and Vares have proved that the probability that the radius of a so-called pond is larger than $n$, differs at most a factor of order $\log n$ from the probability that in critical Bernoulli percolation the radius of an open cluster is larger than $n$. We show that these two probabilities are, in fact, of the same order. Moreover, we prove an analogous result for the volume of a pond.

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Institute of Mathematical Statistics [etc.]
Electronic Communications in Probability
Stochastics

van den Berg, R., Járai, A., & Vagvölgyi, B. (2007). The size of a pond in 2D invasion percolation. Electronic Communications in Probability, 12, 411–420.