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arXiv 1802.01404math.AP
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含凸而非严格凸夹杂的理想电导率问题的爆破分析

Blowup Analysis for the Perfect Conductivity Problem with convex but not strictly convex inclusions

Hongjie Ju, Haigang Li, Longjuan Xu

摘要:

在理想导电问题中,研究两个相邻理想导电夹杂之间的狭窄区域内的电场是否可以变得任意大是一个有趣的问题。本文证明了两个相邻夹杂的相对凸性在电场爆破分析中起着关键作用,并发现了一些新的现象。利用能量方法,证明了当两个相邻的包含体不是局部相对严格凸的,即当窄区域的上下边界部分“平坦”时,解的梯度有界性.当包含体的部分“平坦”边界靠近“平坦”矩阵边界时,得到了该边界的边界估计,并建立了散度型一般椭圆型方程的全维估计.

英文摘要:

In the perfect conductivity problem, it is interesting to study whether the electric field can become arbitrarily large or not, in a narrow region between two adjacent perfectly conducting inclusions. In this paper, we show that the relative convexity of two adjacent inclusions plays a key role in the blowup analysis of the electric field and find some new phenomena. By energy method, we prove the boundedness of the gradient of the solution if two adjacent inclusions fail to be locally relatively strictly convex, namely, if the top and bottom boundaries of the narrow region are partially "flat". The boundary estimates when an inclusion with partially "flat" boundary is close to the "flat" matrix boundary and estimates for the general elliptic equation of divergence form are also established in all dimensions.

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