Null controllability and inverse source problem for stochastic Grushin equation with boundary degeneracy and singularity
ESAIM: Control, Optimisation and Calculus of Variations, Tome 28 (2022), article no. 43

In this paper, we consider a null controllability and an inverse source problem for stochastic Grushin equation with boundary degeneracy and singularity. We construct two special weight functions to establish two Carleman estimates for the whole stochastic Grushin operator with singular potential by a weighted identity method. One is for the backward stochastic Grushin equation with singular weight function. We then apply it to prove the null controllability for stochastic Grushin equation for any T and any degeneracy γ > 0, when our control domain touches the degeneracy line {x = 0}. In order to study the inverse source problem of determining two kinds of sources simultaneously, we prove the other Carleman estimate, which is for the forward stochastic Grushin equation with regular weight function. Based on this Carleman estimate, we obtain the uniqueness of the inverse source problem.

DOI : 10.1051/cocv/2022027
Classification : 93B05, 93B07, 35K65, 35K67
Keywords: Stochastic Grushin equation, Carleman estimate, null controllability, inverse source problem 
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     author = {Yan, Lin and Wu, Bin and Lu, Shiping and Wang, Yuchan},
     title = {Null controllability and inverse source problem for stochastic {Grushin} equation with boundary degeneracy and singularity},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     year = {2022},
     publisher = {EDP-Sciences},
     volume = {28},
     doi = {10.1051/cocv/2022027},
     mrnumber = {4445581},
     zbl = {1497.93026},
     language = {en},
     url = {https://www.numdam.org/articles/10.1051/cocv/2022027/}
}
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Yan, Lin; Wu, Bin; Lu, Shiping; Wang, Yuchan. Null controllability and inverse source problem for stochastic Grushin equation with boundary degeneracy and singularity. ESAIM: Control, Optimisation and Calculus of Variations, Tome 28 (2022), article no. 43. doi: 10.1051/cocv/2022027

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