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arXiv 2202.13286math.PR
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基于变速动力学的中曲率运动

Motion by mean curvature from Glauber-Kawasaki dynamics with speed change

Tadahisa Funaki, Patrick van Meurs, Sunder Sethuraman, Kenkichi Tsunoda

摘要:

我们推导出一个连续平均曲率流作为Glauber-Kawasaki动力学随速度变化的流体动力学标度极限。Kawasaki部分描述了粒子通过粒子相互作用的运动。它在扩散时空尺度中被加速。Glauber部分控制着粒子的产生和湮灭。Glauber部分设置为支持两个级别的粒子密度。它也在时间上加速,但速度低于川崎部分。在这种缩放下,出现了平均曲率界面流,具有反映微观速率的均匀化的“表面张力-流动性”参数。界面将两个级别的颗粒密度分开。在最近的两篇论文中,已经推导出了类似的流体动力学极限;一篇论文中川崎部分描述了简单的最近邻相互作用,另一篇论文中川崎部分被零程过程取代。我们将这两篇论文的主要结果扩展到最近邻相互作用之外。我们的证明的主要新颖性是推导出一个'玻尔兹曼-吉布斯'原则,其中包括一类本地粒子相互作用。

英文摘要:

We derive a continuum mean-curvature flow as a certain hydrodynamic scaling limit of Glauber-Kawasaki dynamics with speed change. The Kawasaki part describes the movement of particles through particle interactions. It is speeded up in a diffusive space-time scaling. The Glauber part governs the creation and annihilation of particles. The Glauber part is set to favor two levels of particle density. It is also speeded up in time, but at a lesser rate than the Kawasaki part. Under this scaling, a mean-curvature interface flow emerges, with a homogenized `surface tension-mobility' parameter reflecting microscopic rates. The interface separates the two levels of particle density. Similar hydrodynamic limits have been derived in two recent papers; one where the Kawasaki part describes simple nearest neighbor interactions, and one where the Kawasaki part is replaced by a zero-range process. We extend the main results of these two papers beyond nearest-neighbor interactions. The main novelty of our proof is the derivation of a `Boltzmann-Gibbs' principle which covers a class of local particle interactions.

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