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arXiv 1907.05342math.AP
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薄膜方程解中等待时间现象的Sharp判据

Sharp criteria for the waiting time phenomenon in solutions to the thin-film equation

Nicola De Nitti, Julian Fischer

摘要:

我们建立清晰的标准瞬时传播的自由边界的解决方案的薄膜方程。该标准是根据质量的初始分布(与之前几乎最优的结果相反)制定的,反映了质量是薄膜方程的局部守恒量的事实。在弱滑移区,我们的准则同时是必要的和充分的。我们对自由边界传播的上界的证明是基于一种“简并传播”的策略,这种策略可以下降到任意小的空间尺度:我们结合对局部质量的估计和对能量的估计来表明,在某个时空柱上的“简并”在具有相同时间范围的空间较小的时空柱上必然会产生“简并”。推导我们的下界自由边界传播是基于一个单调的数量和几乎最佳的估计建立了第二作者与一个新的估计连接运动的质量熵生产的组合。

英文摘要:

We establish sharp criteria for the instantaneous propagation of free boundaries in solutions to the thin-film equation. The criteria are formulated in terms of the initial distribution of mass (as opposed to previous almost-optimal results), reflecting the fact that mass is a locally conserved quantity for the thin-film equation. In the regime of weak slippage, our criteria are at the same time necessary and sufficient. The proof of our upper bounds on free boundary propagation is based on a strategy of "propagation of degeneracy" down to arbitrarily small spatial scales: We combine estimates on the local mass and estimates on energies to show that "degeneracy" on a certain space-time cylinder entails "degeneracy" on a spatially smaller space-time cylinder with the same time horizon. The derivation of our lower bounds on free boundary propagation is based on a combination of a monotone quantity and almost optimal estimates established previously by the second author with a new estimate connecting motion of mass to entropy production.

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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