一维拟线性Smoluchowski-Poisson系统临界非线性的寻找
Looking for critical nonlinearity in the one-dimensional quasilinear Smoluchowski-Poisson system
摘要：
已知一维非线性扩散方程组$a(u)=(1+u)^{-p}$的经典解在有限时间内爆破，若$p>1$，则解整体存在，若$p<1$ .因此，情况$p=1$似乎是关键的，但事实证明，在这种情况下，所有的解决方案也是全球性的。本文实际上确定了两类扩散系数，一类是相应的拟线性Smoluchowski-Poisson方程组的所有解都是全局的，另一类是导致有限时间爆破的充分集中的初始数据。证明的基石是Smoluchowski-Poisson系统的另一种形式，它依赖于一个新的变量变量变换和维里恒等式。
英文摘要：
It is known that classical solutions to the one-dimensional quasilinear Smoluchowski-Poisson system with nonlinear diffusion $a(u)=(1+u)^{-p}$ may blow up in finite time if $p>1$ and exist globally if $p<1$. The case $p=1$ thus appears to be critical but it turns out that all solutions are global also in that case. Two classes of diffusion coefficients are actually identified in this paper, one for which all solutions to the corresponding quasilinear Smoluchowski-Poisson system are global and the other one leading to finite time blow-up for sufficiently concentrated initial data. The cornerstone of the proof are an alternative formulation of the Smoluchowski-Poisson system which relies on a novel change of variables and a virial identity.
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。
