Some results on the controllability of forward stochastic heat equations with control on the drift

Some results on the controllability of forward stochastic heat equations with control on the drift
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漂移控制下正向随机热方程可控性的一些结果

DOI:
10.1016/j.jfa.2010.10.018
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发表时间:
2011-02
影响因子:
1.7
通讯作者:
Lü, Qi
Lü, Qi
中科院分区:
数学1区
文献类型:
--
作者:
Lü, Qi

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在本文中,我们建立了控制漂移的正向随机热方程的零/近似可控性。空可控性是通过时间迭代方法和椭圆算子本征函数部分和的可观测性估计来获得的。由于零可控性,我们获得了后向随机热方程的可观测性估计,这导致后向随机热方程具有独特的连续性,从而得到前向随机热方程所需的近似可控性。值得指出的是,对于正向随机热方程的近似可控性,需要在控制器上引入比零可控性更强的假设。这是随机热方程可控性问题研究中出现的一个新现象。
In this paper, we establish the null/approximate controllability for forward stochastic heat equations with control on the drift. The null controllability is obtained by a time iteration method and an observability estimate on partial sums of eigenfunctions for elliptic operators. As a consequence of the null controllability, we obtain the observability estimate for backward stochastic heat equations, which leads to a unique continuation property for backward stochastic heat equations, and hence the desired approximate controllability for forward stochastic heat equations. It deserves to point out that one needs to introduce a little stronger assumption on the controller for the approximate controllability of forward stochastic heat equations than that for the null controllability. This is a new phenomenon arising in the study of the controllability problem for stochastic heat equations.
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