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arXiv 1206.6641math.AP
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拟线性障碍问题自由边界的正则性

On the Regularity of the Free Boundary for Quasilinear Obstacle Problems

S. Challal, A. Lyaghfouri, J. F. Rodrigues, R. Teymurazyan

摘要:

我们将障碍问题的自由边界的基本正则性推广到几类具有变量增长的非均质拟线性椭圆算子,特别是$p(x)$ -Laplacian算子。在幂增长阶的Lipschitz连续性假设下,利用解在自由边界附近的增长率得到解的孔隙度,这意味着$p(x)$ -Laplacian型非均匀障碍问题的自由边界是勒贝格测度零的.在对算子异质性和数据的附加假设下,我们在两种不同的情况下证明,直到零周长的可忽略奇异集,自由边界至多是$C^1$超曲面的可数族的并:i)将自由边界的$(n-1)$维Hausdorff测度的有限性直接推广到具有常数$p$的非均匀$p$ -Laplacian型算子的情形; $1<p<\infty$ ; ii)证明了非退化或非奇异变幂增长算子$p(x)>1$的重合集的特征函数是有界变差的.

英文摘要:

We extend basic regularity of the free boundary of the obstacle problem to some classes of heterogeneous quasilinear elliptic operators with variable growth that includes, in particular, the $p(x)$-Laplacian. Under the assumption of Lipschitz continuity of the order of the power growth $p(x)>1$, we use the growth rate of the solution near the free boundary to obtain its porosity, which implies that the free boundary is of Lebesgue measure zero for $p(x)$-Laplacian type heterogeneous obstacle problems. Under additional assumptions on the operator heterogeneities and on data we show, in two different cases, that up to a negligible singular set of null perimeter the free boundary is the union of at most a countable family of $C^1$ hypersurfaces: i) by extending directly the finiteness of the $(n-1)$-dimensional Hausdorff measure of the free boundary to the case of heterogeneous $p$-Laplacian type operators with constant $p$; $1<p<\infty$; ii) by proving the characteristic function of the coincidence set is of bounded variation in the case of non degenerate or non singular operators with variable power growth $p(x)>1$.

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