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Riesz minimal energy problems on C~(k-1, 1)-manifolds

机译:C〜(k-1,1)-流形上的Riesz最小能量问题

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摘要

In R~n, n ≥ 2, we study the constructive and numerical solution of minimizing the energy relative to the Riesz kernel |x - y|~(α-n), where 1 < α < n, for the Gauss variational problem, considered for finitely many compact, mutually disjoint, boundaryless (n - 1)-dimensional C~(k-1, 1)-manifolds Γ_l, l ∈ L, where k > (α - 1)/2, each Γ_l being charged with Borel measures with the sign α_l := ±1 prescribed. We show that the Gauss variational problem over a convex set of Borel measures can alternatively be formulated as a minimum problem over the corresponding set of surface distributions belonging to the Sobolev-Slobodetski space H~(-ε/2)(Γ), where ε := α - l and Γ := ∪_(l∈L) Γ_l. An equivalent formulation leads in the case of two manifolds to a nonlinear system of boundary integral equations involving simple layer potential operators on Γ. A corresponding numerical method is based on the Galerkin-Bubnov discretization with piecewise constant boundary elements. Wavelet matrix compression is applied to sparsify the system matrix. Numerical results are presented to illustrate the approach.
机译:在R〜n中,n≥2,我们研究了相对于Riesz核| x-y |〜(α-n)最小化能量的构造和数值解,其中1 <α(α-1)/ 2,每个Γ_1规定符号α_1:=±1的Borel度量。我们表明,可以将凸集Borel测度上的高斯变分问题表述为属于Sobolev-Slobodetski空间H〜(-ε/ 2)(Γ)的对应表面分布集上的最小问题,其中ε :=α-l和Γ:=∪_(l∈L)Γ_l。在两个流形的情况下,等效公式导致了边界积分方程的非线性系统,其中涉及Γ上的简单层势算子。相应的数值方法基于具有分段常数边界元的Galerkin-Bubnov离散化。应用小波矩阵压缩来稀疏系统矩阵。数值结果表明了该方法。

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