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arXiv 1802.05038math.AP
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阻尼双曲 Allen-Cahn 方程的界面运动

Motion of interfaces for a damped hyperbolic Allen-Cahn equation

Raffaele Folino, Corrado Lattanzio, Corrado Mascia

AI总结:

本文研究二维或三维有界区域中阻尼双曲 Allen-Cahn 方程的径向对称解,证明在适当初始条件下其界面在小扩散系数极限中仍遵循平均曲率流。

摘要:

考虑 Allen-Cahn 方程 $u_t=\varepsilon^2Δu-F'(u)$,其中 $F$ 是一个双势阱势函数,两个势阱深度相等,位于 $\pm1$。已有大量论文研究当扩散系数 $\varepsilon\to0^+$ 时解的极限行为;众所周知,如果初始数据 $u(\cdot,0)$ 在区域 $Ω_+$ 和 $Ω_-$ 中分别取值 $+1$ 和 $-1$,那么连接 $Ω_+$ 与 $Ω_-$ 的“界面”会以等于其主曲率之和的法向速度运动,即界面按平均曲率流运动。本文关注在 $\mathbb{R}^n$($n=2$ 或 $n=3$)的有界区域中,阻尼双曲 Allen-Cahn 方程的界面运动。特别地,我们将注意力集中在径向对称解上,详细研究其与经典抛物情形的差异,并证明在对初始数据 $u(\cdot,0)$ 和 $u_t(\cdot,0)$ 作适当假设下,当 $\varepsilon\to0^+$ 时,双曲框架下的界面也按平均曲率运动。

英文摘要:

Consider the Allen-Cahn equation $u_t=\varepsilon^2Δu-F'(u)$, where $F$ is a double well potential with wells of equal depth, located at $\pm1$. There are a lot of papers devoted to the study of the limiting behavior of the solutions as the diffusion coefficient $\varepsilon\to0^+$, and it is well known that, if the initial datum $u(\cdot,0)$ takes the values $+1$ and $-1$ in the regions $Ω_+$ and $Ω_-$, then the "interface" connecting $Ω_+$ and $Ω_-$ moves with normal velocity equal to the sum of its principal curvatures, i.e. the interface moves by mean curvature flow. This paper concerns with the motion of the inteface for a damped hyperbolic Allen-Cahn equation, in a bounded domain of $\mathbb{R}^n$, for $n=2$ or $n=3$. In particular, we focus the attention on radially simmetric solutions, studying in detail the differences with the classic parabolic case, and we prove that, under appropriate assumptions on the initial data $u(\cdot,0)$ and $u_t(\cdot,0)$, the interface moves by mean curvature as $\varepsilon\to0^+$ also in the hyperbolic framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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