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• W2797738710 abstract "Some recent works have shown that the heat equation posed on the whole Euclidean space is null-controllable in any positive time if and only if the control subset is a thick set. This necessary and sufficient condition for null-controllability is linked to some uncertainty principles as the Logvinenko-Sereda theorem which give limitations on the simultaneous concentration of a function and its Fourier transform. In the present work, we prove new uncertainty principles for finite combinations of Hermite functions and establish an analogue of the Logvinenko-Sereda theorem with an explicit control of the constant with respect to the energy level of the Hermite functions as eigenfunctions of the harmonic oscillator for thick control subsets. This spectral inequality allows to derive the null-controllability in any positive time from thick control regions for parabolic equations associated with a general class of hypoelliptic non-selfadjoint quadratic differential operators. More generally, the spectral inequality for finite combinations of Hermite functions is actually shown to hold for any measurable control subset of positive Lebesgue measure, and some quantitative estimates of the constant with respect to the energy level are given for two other classes of control subsets including the case of non-empty open control subsets." @default.
• W2797738710 created "2018-04-24" @default.
• W2797738710 creator A5005345782 @default.
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• W2797738710 date "2018-04-13" @default.
• W2797738710 modified "2023-09-25" @default.
• W2797738710 title "Spectral estimates for finite combinations of Hermite functions and null-controllability of hypoelliptic quadratic equations" @default.
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• W2797738710 hasPublicationYear "2018" @default.
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