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arXiv 1111.2625math.AP
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不连续泛函极小值的正则性和几何估计

Regularity and geometric estimates for minima of discontinuous functionals

Raimundo Leitão, Eduardo V. Teixeira

摘要:

本文研究了一般退化椭圆泛函$\int F(X,u,Du) dX \to \min$的非负极小元,其中变分核$F$在$u$中是不连续的,且不连续的阶为$\sim χ_{\{u > 0 \}}$ .因此,欧拉-拉格朗日方程是由一个非齐次的,退化的椭圆型方程与自由边界之间的积极和零相位的最小。我们证明了最优梯度估计和最小值的非退化性。我们还讨论了自由边界的弱正则性和强正则性。我们证明了集合$\{u > 0 \}$具有局部有限的周长,并且约化的自由边界$\partial_\text{red} \{u > 0 \}$具有$\mathcal{H}^{n-1}$ -全测度。对于更具体的问题,出现在射流,我们表明,减少自由边界是局部的图形的$C^{1,γ}$功能。

英文摘要:

In this paper we study nonnegative minimizers of general degenerate elliptic functionals, $\int F(X,u,Du) dX \to \min$, for variational kernels $F$ that are discontinuous in $u$ with discontinuity of order $\sim χ_{\{u > 0 \}}$. The Euler-Lagrange equation is therefore governed by a non-homogeneous, degenerate elliptic equation with free boundary between the positive and the zero phases of the minimizer. We show optimal gradient estimate and nondegeneracy of minima. We also address weak and strong regularity properties of free boundary. We show the set $\{u > 0 \}$ has locally finite perimeter and that the reduced free boundary, $\partial_\text{red} \{u > 0 \}$, has $\mathcal{H}^{n-1}$-total measure. For more specific problems that arise in jet flows, we show the reduced free boundary is locally the graph of a $C^{1,γ}$ function.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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