The harmonic explorer is a random grid path. Very roughly, at each step the harmonic explorer takes a turn to the right with probability equal to the discrete harmonic measure of the left-hand side of the path from a point near the end of the current path. We prove that the harmonic explorer converges to SLE4 as the grid gets finer.
@article{1133965855,
author = {Schramm, Oded and Sheffield, Scott},
title = {Harmonic explorer and its convergence to SLE<sub>4</sub>},
journal = {Ann. Probab.},
volume = {33},
number = {1},
year = {2005},
pages = { 2127-2148},
language = {en},
url = {http://dml.mathdoc.fr/item/1133965855}
}
Schramm, Oded; Sheffield, Scott. Harmonic explorer and its convergence to SLE4. Ann. Probab., Tome 33 (2005) no. 1, pp. 2127-2148. http://gdmltest.u-ga.fr/item/1133965855/