A unified weighted inequality for fourth-order partial differential operators and applications. (English) Zbl 1540.35160
Summary: In this paper, we establish a fundamental inequality for fourth order partial differential operator \(\mathcal{P} \overset{\triangle}{=} \alpha \partial_s + \beta \partial_{ss} + \Delta^2 (\alpha, \beta \in \mathbb{R})\) with an abstract exponential-type weight function. Such kind of weight functions including not only the regular weight functions but also the singular weight functions. Using this inequality we are able to prove some Carleman estimates for the operator \(\mathcal{P}\) with some suitable boundary conditions in the case of \(\beta <0\) or \(\alpha \neq 0\), \(\beta = 0\). As application, we obtain a resolvent estimate for \(\mathcal{P}\), which can imply a log-type stabilization result for the plate equation with clamped boundary conditions or hinged boundary conditions.
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