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arXiv 1502.05758math.AP
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反应扩散方程的Modica型梯度估计和De Giorgi猜想的抛物对应

Modica type gradient estimates for reaction-diffusion equations and a parabolic counterpart of a conjecture of De Giorgi

Agnid Banerjee, Nicola Garofalo

摘要:

本文继续研究了在\cite{BG}中提出的非齐次抛物型方程的Modica型梯度估计。首先,我们表明,抛物型极小曲面方程的半线性力项,如果一定的梯度估计满足$t=0$,那么它持有所有以后的时间$t>0$。然后,我们建立类似的结果,反应扩散方程,如\eqref{e0}以下在$\Om \times [0, T]$,其中$\Om$是一个epigraph,使平均曲率的$\partial \Om$是非负的。然后,我们把我们的注意力转移到这样的梯度估计是有效的,没有任何先验信息的估计是否在某个较早的时间。非常值得注意的是(见定理\ref{main3},定理\ref{main5}和定理\ref{T:ricci}),这对$\Rn \times (-\infty, 0]$和$\Om \times (-\infty, 0]$是正确的,其中$\Om$是满足上述几何假设的上图,对$M \times (-\infty,0]$是正确的,其中$M$是具有非负Ricci张量的连通紧致黎曼流形。作为梯度估计\eqref{mo2}的结果,我们建立了\eqref{e0}的解的刚性结果(见下面的定理\ref{main6}),它是\cite{CGS}中定理5.1的类似物。最后,出于定理\ref{main6},我们关闭的文件,提出了一个抛物线版本的著名猜想的德乔治也被称为$\ve$版本的伯恩斯坦定理。

英文摘要:

We continue the study of Modica type gradient estimates for non-homogeneous parabolic equations initiated in \cite{BG}. First, we show that for the parabolic minimal surface equation with a semilinear force term if a certain gradient estimate is satisfied at $t=0$, then it holds for all later times $t>0$. We then establish analogous results for reaction-diffusion equations such as \eqref{e0} below in $\Om \times [0, T]$, where $\Om$ is an epigraph such that the mean curvature of $\partial \Om$ is nonnegative. We then turn our attention to settings where such gradient estimates are valid without any a priori information on whether the estimate holds at some earlier time. Quite remarkably (see Theorem \ref{main3}, Theorem \ref{main5} and Theorem \ref{T:ricci}), this is is true for $\Rn \times (-\infty, 0]$ and $\Om \times (-\infty, 0]$, where $\Om$ is an epigraph satisfying the geometric assumption mentioned above, and for $M \times (-\infty,0]$, where $M$ is a connected, compact Riemannian manifold with nonnegative Ricci tensor. As a consequence of the gradient estimate \eqref{mo2}, we establish a rigidity result (see Theorem \ref{main6} below) for solutions to \eqref{e0} which is the analogue of Theorem 5.1 in \cite{CGS}. Finally, motivated by Theorem \ref{main6}, we close the paper by proposing a parabolic version of the famous conjecture of De Giorgi also known as the $\ve$-version of the Bernstein theorem.

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