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arXiv 1408.2013math.APmath.OCmath.PR
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可达集的大时间平均及其在振荡时空运动界面均匀化中的应用

Large time average of reachable sets and Applications to Homogenization of interfaces moving with oscillatory spatio-temporal velocity

W. Jing, P. E. Souganidis, H. V. Tran

摘要:

我们研究了正振荡法向速度运动的锋面的平均,它在空间上是周期性的,在时间上是平稳遍历的。该问题可以转化为具有时空振荡的强制水平集Hamilton-Jacobi方程的均匀化问题。为了克服由于时间振荡和次线性增长的哈密顿量的困难,我们首先研究了相关的可达集使用几何参数的长时间平均行为。结果是新的高于一维,即使在时空周期设置。

英文摘要:

We study the averaging of fronts moving with positive oscillatory normal velocity, which is periodic in space and stationary ergodic in time. The problem can be reformulated as the homogenization of coercive level set Hamilton-Jacobi equations with spatio-temporal oscillations. To overcome the difficulties due to the oscillations in time and the sublinear growth of the Hamiltonian, we first study the long time averaged behavior of the associated reachable sets using geometric arguments. The results are new for higher than one dimensions even in the space-time periodic setting.

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