Inverted Parabola as a Stable Steady Solution of the Surface Growth Model

Abstract: For the surface growth model under molecular beam epitaxy on $\mathbb{R}$, we show that an inverted parabola is a stable steady solution in the sense that any small perturbation of it decays in $L<sup>{\infty}(\mathbb{R})$ at the rate $O(t^{-1/2}\log t)$. The proof is based on the explicit solution operator generated by the linearized perturbation equation. This result partially justifies the merging of two neighboring islands into a bigger one. Moreover, any derivative of its solution is shown to be decaying in $L<sup>{2}(\mathbb{R})$ for sufficiently small initial data.