Bump solutions for the mesoscopic Allen–Cahn equation in periodic media

AbstractGiven a double-well potential F, a $${\mathbb{Z}^n}$$-periodic function H, small and with zero average, and ε > 0, we find a large R, a small δ and a function Hε which is ε-close to H for which the following two problems have solutions: 1.Find a set Eε,R whose boundary is uniformly close to ∂ BR and has mean curvature equal to −Hε at any point,2.Find u = uε,R,δ solving $$ -\delta\,\Delta u + \frac{F'(u)}{\delta} +\frac{c_0}{2} H_\varepsilon = 0, $$such that uε,R,δ goes from a δ-neighborhood of + 1 in BR to a δ-neighborhood of −1 outside BR.

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