Periodic damping gives polynomial energy decay
Periodic damping gives polynomial energy decay
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周期性阻尼产生多项式能量衰减
DOI:
10.4310/mrl.2017.v24.n2.a15
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
J. Wunsch
中科院分区:
文献类型:
--
作者:
J. Wunsch
Let $u$ solve the damped Klein--Gordon equation $$ \big( \partial_t^2-\sum \partial_{x_j}^2 +m \text{Id} +\gamma(x) \partial_t \big) u=0 $$ on $\mathbb{R}^n$ with $m>0$ and $\gamma\geq 0$ bounded below on a $2 \pi \mathbb{Z}^n$-invariant open set by a positive constant. We show that the energy of the solution $u$ decays at a polynomial rate. This is proved via a periodic observability estimate on $\mathbb{R}^n.$