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arXiv 2103.16823math.AP
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二重形式:正则椭圆双拉普拉斯算子

Double forms: Regular elliptic bilaplacian operators

Raz Kupferman, Roee Leder

摘要:

二重形式是向量丛$Λ^{k}T^*\mathcal{M}\otimes Λ^{m}T^*\mathcal{M}$的截面,其中$(\mathcal{M},\mathfrak{g})$是一个紧的带边界的黎曼流形.研究了分次二阶微分算子的二重形式,这类算子在物理上有着广泛的应用。这些算子的组合产生一个四阶算子,我们称之为双拉普拉斯算子。我们建立了几组边界条件下的双双拉普拉斯算子的正则椭圆性。在额外的条件下,我们得到了一个Hodge分解的双重形式,其组件是图像的二阶运营商,以及一个双调和元素。这种分析奠定了基础,解决几个问题,在不协调弹性,最突出的存在的应力潜力和圣维南兼容性。

英文摘要:

Double forms are sections of the vector bundles $Λ^{k}T^*\mathcal{M}\otimes Λ^{m}T^*\mathcal{M}$, where in this work $(\mathcal{M},\mathfrak{g})$ is a compact Riemannian manifold with boundary. We study graded second-order differential operators on double forms, which are used in physical applications. A Combination of these operators yields a fourth-order operator, which we call a double bilaplacian. We establish the regular ellipticity of the double bilaplacian for several sets of boundary conditions. Under additional conditions, we obtain a Hodge-like decomposition for double forms, whose components are images of the second-order operators, along with a biharmonic element. This analysis lays foundations for resolving several topics in incompatible elasticity, most prominently the existence of stress potentials and Saint-Venant compatibility.

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