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arXiv 2004.07942math.AP
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层中弱耦合二阶抛物型方程组解的精确逐点估计

Sharp pointwise estimates for solutions of weakly coupled second order parabolic system in a layer

Gershon Kresin, Vladimir Maz'ya

摘要:

本文讨论了二阶线性齐次和非齐次弱耦合抛物型方程组在${\mathbb R}^{n+1}_T={\mathbb R}^n\times (0, T)$层上的Cauchy问题的$m$分量向量值解。我们假设系统的系数是实数,并且仅依赖于$t$、$n\geq 1$和$T<\infty$。在$[L^p({\mathbb R}^n)]^m$、$1\leq p \leq \infty $中考虑了具有初始数据的均匀系统。对于非齐次系统,我们假设初始函数为零,右边属于$[L^p({\mathbb R}^{n+1}_T)]^m\cap [C^α\big (\overline{{\mathbb R}^{n+1}_T} \big )]^m $,$α\in (0, 1)$。得到了这类问题解的逐点估计的锐系数及其方向导数的显式表达式。

英文摘要:

We deal with $m$-component vector-valued solutions to the Cauchy problem for linear both homogeneous and nonhomogeneous weakly coupled second order parabolic system in the layer ${\mathbb R}^{n+1}_T={\mathbb R}^n\times (0, T)$. We assume that coefficients of the system are real and depending only on $t$, $n\geq 1$ and $T<\infty$. The homogeneous system is considered with initial data in $[L^p({\mathbb R}^n)]^m$, $1\leq p \leq \infty $. For the nonhomogeneous system we suppose that the initial function is equal to zero and the right-hand side belongs to $[L^p({\mathbb R}^{n+1}_T)]^m\cap [C^α\big (\overline{{\mathbb R}^{n+1}_T} \big )]^m $, $α\in (0, 1)$. Explicit formulas for the sharp coefficients in pointwise estimates for solutions of these problems and their directional derivative are obtained.

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