The sharpinterface limit of the action functional for AllenCahn in one space dimension
Preprint Series # 705 Kohn, Robert V. and Maria G, Reznikoff and Tonegawa, Yoshihiro The sharpinterface limit of the action functional for AllenCahn in one space dimension. (2005); AbstractWe analyze the sharpinterface limit of the action minimization problem for the stochastically perturbed AllenCahn equation in one space dimension. The action is a deterministic functional which is linked to the behavior of the stochastic process in the small noise limit. Previously, heuristic srguments and numerical result heve suggested that the limiting action should“count” two competing costs: the cost to nucleate interfaces and the cost to propagate them. In addition, constructions have been used to derive an upper bound for the minimal action which was proved optimal on the level of \it{scaling}. In this paper, we prove that for $(d=1)$, the upper bound achieved by the constructions is in fact sharp. Furthermore, we derive a lower bound for the functional itself, which is in agreement with the heuristic picture. To do so, we characterize the sharpinterface limit of the spacetime energy measures. The proof relies on an extension of earlier results for the related elliptic problem.
