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research article

Semi-global controllability of a geometric wave equation

Krieger, Joachim  
β€’
Xiang, Shengquan  
May 2, 2022
Pure and Applied Mathematics Quarterly

We prove the semi-global controllability and stabilization of the $(1+1)-$dimensional wave maps equation with spatial domain π•Š1 and target $π•Šk$. First we show that damping stabilizes the system when the energy is strictly below the threshold $2Ο€$, where harmonic maps appear as obstruction for global stabilization. Then, we adapt an iterative control procedure to get low-energy exact controllability of the wave maps equation. This result is optimal in the case $k=1$.

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