A sharp-threshold theorem is proved for box-crossing probabilities on the square lattice. The models in question are the random-cluster model near the self-dual point psd(q)=√q∕(1+√q), the Ising model with external field, and the colored random-cluster model. The principal technique is an extension of the influence theorem for monotonic probability measures applied to increasing events with no assumption of symmetry.
@article{1292598033,
author = {Graham, Benjamin and Grimmett, Geoffrey},
title = {Sharp thresholds for the random-cluster and Ising models},
journal = {Ann. Appl. Probab.},
volume = {21},
number = {1},
year = {2011},
pages = { 240-265},
language = {en},
url = {http://dml.mathdoc.fr/item/1292598033}
}
Graham, Benjamin; Grimmett, Geoffrey. Sharp thresholds for the random-cluster and Ising models. Ann. Appl. Probab., Tome 21 (2011) no. 1, pp. 240-265. http://gdmltest.u-ga.fr/item/1292598033/