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Moment bounds for the corrector in stochastic homogenization of a percolation model (1406.5723v1)

Published 22 Jun 2014 in math.AP

Abstract: We study the corrector equation in stochastic homogenization for a simplified Bernoulli percolation model on $\mathbb{Z}d$, $d>2$. The model is obtained from the classical ${0,1}$-Bernoulli bond percolation by conditioning all bonds parallel to the first coordinate direction to be open. As a main result we prove (in fact for a slightly more general model) that stationary correctors exist and that all finite moments of the corrector are bounded. This extends a previous result in [GO1], where uniformly elliptic conductances are treated, to the degenerate case. With regard to the associated random conductance model, we obtain as a side result that the corrector not only grows sublinearly, but slower than any polynomial rate. Our argument combines a quantification of ergodicity by means of a Spectral Gap on Glauber dynamics with regularity estimates on the gradient of the elliptic Green's function.

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