Lifespan of solutions to the Strauss type wave system on asymptotically flat space-times

Lifespan of solutions to the Strauss type wave system on asymptotically flat space-times
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渐近平坦时空上施特劳斯型波系统解的寿命

DOI:
10.3934/dcds.2020208
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发表时间:
2020-10
影响因子:
1.1
通讯作者:
Wan Chengbo
Wan Chengbo
中科院分区:
数学3区
文献类型:
--
作者:
Dai Wei;Fan Daoyuan;Wan Chengbo

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通过在$(1+3)$维渐近平坦时空上假设一定的局部能量估计,研究了\emph{Strauss}型波系统的存在部分。首先给出了一种与\cite{MR2944027}中出现的局部能量范数相关的时空估计。这些估计可以用来证明渐近平坦时空上波动方程的一系列加权\emph{Strichartz}和\emph{KSS}型估计。然后应用时空估计得到了非线性指数$p$和$q\ge 2$下的寿命下界。特别地,我们对于亚临界情况的界一般是尖锐的,并且我们扩展了$(p,q)$的已知区域以允许全局解。此外,初始数据不需要紧凑支持,当$p, q>2$。
By assuming certain local energy estimates on $(1+3)$-dimensional asymptotically flat space-time, we study the existence portion of the \emph{Strauss} type wave system. Firstly we give a kind of space-time estimates which are related to the local energy norm that appeared in \cite{MR2944027}. These estimates can be used to prove a series of weighted \emph{Strichartz} and \emph{KSS} type estimates, for wave equations on asymptotically flat space-time. Then we apply the space-time estimates to obtain the lower bound of the lifespan when the nonlinear exponents $p$ and $q\ge 2$. In particular, our bound for the subcritical case is sharp in general and we extend the known region of $(p,q)$ to admit global solutions. In addition, the initial data are not required to be compactly supported, when $p, q>2$.
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