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arXiv 1306.5197math.APmath.PR
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边界退化线性抛物型微分算子的最大值原理

Maximum principles for boundary-degenerate linear parabolic differential operators

Paul M. N. Feehan

摘要:

我们发展弱和强最大值原理的边界退化,线性,抛物型,二阶偏微分算子,$Lu := -u_t-\tr(aD^2u)-\langle b, Du\rangle + cu$,与\emph{partial} Dirichlet边界条件。假设系数$a(t,x)$沿着域$\sQ\subset\RR^{d+1}$的抛物线边界$\mydirac!\sQ$的非空开子集$\mydirac_0!\sQ$(称为\emph{degenerate boundary portion})消失,而$a(t,x)$在\emph{non-degenerate boundary portion}($\mydirac_1!\sQ := \mydirac!\sQ\less\bar{\mydirac_0!\sQ}$)中的点处可以是非零的。$\mydirac_0!\sQ$中的点与域$\sQ$内部的点起着相同的作用,边界比较只需要非退化边界部分$\mydirac_1!\sQ$。我们还开发了比较原则和先验最大值原理估计的边界退化抛物算子定义的边界值和障碍问题的解决方案,再次只有非退化的边界部分,$\mydirac_1!\sQ$,需要边界比较。我们的结果补充了我们以前的文章[arXiv 1204.6613,arXiv:1305.5098]中的结果。

英文摘要:

We develop weak and strong maximum principles for boundary-degenerate, linear, parabolic, second-order partial differential operators, $Lu := -u_t-\tr(aD^2u)-\langle b, Du\rangle + cu$, with \emph{partial} Dirichlet boundary conditions. The coefficient, $a(t,x)$, is assumed to vanish along a non-empty open subset, $\mydirac_0!\sQ$, called the \emph{degenerate boundary portion}, of the parabolic boundary, $\mydirac!\sQ$, of the domain $\sQ\subset\RR^{d+1}$, while $a(t,x)$ may be non-zero at points in the \emph{non-degenerate boundary portion}, $\mydirac_1!\sQ := \mydirac!\sQ\less\bar{\mydirac_0!\sQ}$. Points in $\mydirac_0!\sQ$ play the same role as those in the interior of the domain, $\sQ$, and only the non-degenerate boundary portion, $\mydirac_1!\sQ$, is required for boundary comparisons. We also develop comparison principles and a priori maximum principle estimates for solutions to boundary value and obstacle problems defined by boundary-degenerate parabolic operators, again where only the non-degenerate boundary portion, $\mydirac_1!\sQ$, is required for boundary comparisons. Our results complement those in our previous articles [arXiv1204.6613, arXiv:1305.5098].

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