Rapid phase ordering of Ising dynamics on ${\mathbb{Z}}^2$

Abstract

We consider the phase ordering problem for the low-temperature Ising dynamics initialized from a biased and disordered initialization. Work of Fontes, Schonmann, Sidoravicius (2002) showed that at zero-temperature, Ising Glauber dynamics on ${\mathbb{Z}}^d$ for $d\ge 2$ initialized from i.i.d. spins on each vertex that are $+1$ with sufficiently large probability, absorbs into the all-plus configuration quickly. We prove that analogous behavior holds throughout the low-temperature regime of the Ising model in two dimensions. Namely, there exists $p_0<1$ such that Ising Glauber dynamics initialized from i.i.d. spins that are $+1$ with probability $p>p_0$, run at any low temperature ${\hat{I}}^2>{\hat{I}}_c^2$ converges rapidly to the plus phase measure $\ddot{I}{€}^{+}$. The result is proved using a spacetime multiscale coupling valid in any $d\ge 2$, that boosts a uniform-in-${\hat{I}}^2$ quasi-polynomial bound on the mixing time of Ising dynamics with plus boundary conditions, into rapid phase ordering from biased initializations with no boundary conditions.

56 pages, 3 figures