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arXiv 2108.11291math.AP
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具有凸源的抽象半线性heat equation非负解的爆破

Blow-up of nonnegative solutions of an abstract semilinear heat equation with convex source

Daniel Lenz, Marcel Schmidt, Ian Zimmermann

摘要:

给出了半线性热方程$u' = Lu + f(u)$ in $L^p(X,m)$ for $p \in [1,\infty)$的Cauchy问题不存在整体非负温和解的充分条件,其中$(X,m)$是$σ$ -有限测度空间,$L$是$L^p(X,m)$中有界线性算子的次马尔可夫强连续半群的无穷小生成元,$f$是严格增凸的,$[0,\infty)$上的连续函数,带有$f(0) = 0$和$\int_1^\infty 1/f < \infty$。由于我们没有对扩散行为作进一步的假设,我们的主要结果可以看作是关于一般情况下由$L$表示的扩散和由$f$表示的反应之间的竞争。我们将我们的结果应用于拉普拉斯流形,图形,更一般地说,度量测度空间的热核。在这个过程中,我们恢复和扩展一些旧的,以及最近的结果在一个统一的框架。

英文摘要:

We give a sufficient condition for non-existence of global nonnegative mild solutions of the Cauchy problem for the semilinear heat equation $u' = Lu + f(u)$ in $L^p(X,m)$ for $p \in [1,\infty)$, where $(X,m)$ is a $σ$-finite measure space, $L$ is the infinitesimal generator of a sub-Markovian strongly continuous semigroup of bounded linear operators in $L^p(X,m)$, and $f$ is a strictly increasing, convex, continuous function on $[0,\infty)$ with $f(0) = 0$ and $\int_1^\infty 1/f < \infty$. Since we make no further assumptions on the behaviour of the diffusion, our main result can be seen as being about the competition between the diffusion represented by $L$ and the reaction represented by $f$ in a general setting. We apply our result to Laplacians on manifolds, graphs, and, more generally, metric measure spaces with a heat kernel. In the process, we recover and extend some older as well as recent results in a unified framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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