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arXiv 1811.08554math.AP
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超越对偶配对的齐次拟线性抛物问题的部分存在性结果

Partial existence result for Homogeneous Quasilinear parabolic problems beyond the duality pairing

Karthik Adimurthi, Sun-Sig Byun, Wontae Kim

摘要:

本文研究了在满足一致容量密度条件的有界区域$Ω$上求解\cref{main-3}的分布解的存在性,其中非线性结构$\mathcal{A}(x,t,\nabla u)$是按照标准抛物型$p$ -Laplace算子建模的.在这方面,我们需要证明先验估计的自然指数以下的解决方案和一个更高的可积性结果非常弱解在初始边界的梯度。椭圆对应这两个估计是相当发达,在过去的几十年里,但没有类似的理论存在于准线性抛物设置。这里证明的估计的两个重要特征是,它们在性质上是非微扰的,并且我们能够采用非零边界数据。\emph{As a consequence, our estimates are new even for the heat equation on bounded domains.}这个部分存在性结果是非常弱解的存在性理论从椭圆环境到拟线性抛物环境的非平凡推广。尽管我们只证明了部分存在性结果,但我们建立了必要的框架,当证明时将导致获得齐次问题的完整结果。

英文摘要:

In this paper, we study the existence of distributional solutions solving \cref{main-3} on a bounded domain $Ω$ satisfying a uniform capacity density condition where the nonlinear structure $\mathcal{A}(x,t,\nabla u)$ is modelled after the standard parabolic $p$-Laplace operator. In this regard, we need to prove a priori estimates for the gradient of the solution below the natural exponent and a higher integrability result for very weak solutions at the initial boundary. The elliptic counterpart to these two estimates are fairly well developed over the past few decades, but no analogous theory exists in the quasilinear parabolic setting. Two important features of the estimates proved here are that they are non-perturbative in nature and we are able to take non-zero boundary data. \emph{As a consequence, our estimates are new even for the heat equation on bounded domains.} This partial existence result is a nontrivial extension of the existence theory of very weak solutions from the elliptic setting to the quasilinear parabolic setting. Even though we only prove partial existence result, nevertheless we establish the necessary framework that when proved would lead to obtaining the full result for the homogeneous problem.

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