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arXiv 1702.06202math.AP
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非光滑区域上非线性抛物型方程的整体Lorentz估计

Global Lorentz estimates for nonlinear parabolic equations on nonsmooth domains

The Anh Bui, Xuan Thinh Duong

摘要:

考虑形式为$$ u_t-{\rm div} \mathbf{a}(D u,x,t)={\rm div}\,(|F|^{p-2}F) \quad \text{in} \quad Ω\times(0,T), $$的非线性抛物型方程,其中$T>0$和$Ω$是Reifenberg区域.我们假设非线性$\mathbf{a}(ξ,x,t)$相对于$x$具有小的BMO范数,并且相对于时间变量$t$仅仅是可测量的和有界的。本文在Lorentz空间中证明了该抛物型方程的弱解的整体Calderón-Zygmund估计,其中包含了Lebesgue空间中的估计.我们的整体Calderón-Zygmund估计扩展了某些以前的结果,方程的非线性$\mathbf{a}(ξ,x,t)$和更一般的设置洛伦兹空间的正则性假设较少。

英文摘要:

Consider the nonlinear parabolic equation in the form $$ u_t-{\rm div} \mathbf{a}(D u,x,t)={\rm div}\,(|F|^{p-2}F) \quad \text{in} \quad Ω\times(0,T), $$ where $T>0$ and $Ω$ is a Reifenberg domain. We suppose that the nonlinearity $\mathbf{a}(ξ,x,t)$ has a small BMO norm with respect to $x$ and is merely measurable and bounded with respect to the time variable $t$. In this paper, we prove the global Calderón-Zygmund estimates for the weak solution to this parabolic problem in the setting of Lorentz spaces which includes the estimates in Lebesgue spaces. Our global Calderón-Zygmund estimates extend certain previous results to equations with less regularity assumptions on the nonlinearity $\mathbf{a}(ξ,x,t)$ and to more general setting of Lorentz spaces.

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