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arXiv 1902.04459math.AP
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二次微分方程:部分Gelfand-Shilov光滑效应和零能控性

Quadratic differential equations : partial Gelfand-Shilov smoothing effect and null-controllability

Paul Alphonse

摘要:

研究了一类增生非自伴二次算子相关的发展方程解的部分Gelfand-Shilov正则化效应和指数衰减,这些方程在整个相空间上不是全局亚椭圆的。利用Gevrey正则化效应,研究了这类可能非全局亚椭圆二次算子在整个欧几里得空间上的抛物型方程的零能控性.我们证明了这些抛物型方程在任意正时间上都是零能控的。这种厚度性质是整个欧几里得空间上热方程零能控的一个充要条件。结果表明,这个几何条件是一类二次微分算子零能控的充分条件。

英文摘要:

We study the partial Gelfand-Shilov regularizing effect and the exponential decay for the solutions to evolution equations associated to a class of accretive non-selfadjoint quadratic operators, which fail to be globally hypoelliptic on the whole phase space. By taking advantage of the associated Gevrey regularizing effects, we study the null-controllability of parabolic equations posed on the whole Euclidean space associated to this class of possibly non-globally hypoelliptic quadratic operators. We prove that these parabolic equations are null-controllable in any positive time from thick control subsets. This thickness property is known to be a necessary and sufficient condition for the null-controllability of the heat equation posed on the whole Euclidean space. Our result shows that this geometric condition turns out to be a sufficient one for the null-controllability of a large class of quadratic differential operators.

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