On energy functionals for second-order elliptic systems with constant coefficients

Astamur Bagapsh; Konstantin Fedorovskiy

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arXiv · 2207.04278

On energy functionals for second-order elliptic systems with constant coefficients

Astamur Bagapsh·Konstantin Fedorovskiy

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Abstract

We consider the Dirichlet problem for second-order elliptic systems with constant coefficients. We prove that non-reducible strongly elliptic systems of this type do not admits non-negatively defined energy functionals of the form $f\mapsto\int_{D}\varPhi(u_x,v_x,u_y,v_y)\,dxdy$, where $D$ is the domain where the problem we are interested in is considered, $\varPhi$ is some quadratic form in $\mathbb R^4$, and $f=u+iv$ is a function in the complex variable. The proof is based on reducing the system under consideration to a special (canonical) form, when the differential operator defining this system is represented as a perturbation of the Laplace operator with respect to two small real parameters (the canonical parameters of the system under consideration).

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Astamur Bagapsh, Konstantin Fedorovskiy. 2022-07-09. On energy functionals for second-order elliptic systems with constant coefficients. https://arxiv.org/abs/2207.04278

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