Mathematics > Analysis of PDEs
[Submitted on 25 Apr 2018 (v1), last revised 14 Sep 2018 (this version, v3)]
Title:Global existence and decay to equilibrium for some crystal surface models
View PDFAbstract:In this paper we study the large time behavior of the solutions to the following nonlinear fourth-order equations $$ \partial_t u=\Delta e^{-\Delta u}, $$ $$ \partial_t u=-u^2\Delta^2(u^3). $$ These two PDE were proposed as models of the evolution of crystal surfaces by J. Krug, H.T. Dobbs, and S. Majaniemi (Z. Phys. B, 97, 281-291, 1995) and H. Al Hajj Shehadeh, R. V. Kohn, and J. Weare (Phys. D, 240, 1771-1784, 2011), respectively. In particular, we find explicitly computable conditions on the size of the initial data (measured in terms of the norm in a critical space) guaranteeing the global existence and exponential decay to equilibrium in the Wiener algebra and in Sobolev spaces.
Submission history
From: Martina Magliocca [view email][v1] Wed, 25 Apr 2018 16:01:08 UTC (19 KB)
[v2] Sat, 30 Jun 2018 14:43:29 UTC (20 KB)
[v3] Fri, 14 Sep 2018 07:06:57 UTC (22 KB)
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