高维波动方程的发散集
The divergence set for the wave equation in higher dimensions
- Northwestern University(西北大学)
- The University of Queensland(昆士兰大学)
- University of Jyväskylä(于韦斯屈莱大学)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
本文研究高维波动方程解在初始时刻的逐点收敛性,在特定正则性范围内验证了Barceló等人关于例外集维数的猜想,并推广到更高维空间。
AI中文摘要:
本文证明,若$u$在$\mathbb{R}^{4+1}$中求解波动方程,初始数据$u(\cdot,0) = u_0(\cdot) \in H^s$且$\partial_tu(\cdot,0) = u_1(\cdot ) \in H^{s-1}$,其中$0.5 < s \leq 0.55$,则当$t \to 0$时,对所有位于Hausdorff维数至多为$6-4s$的例外集之外的$x$,有$u(x,t) \to u_0(x)$和$\partial_tu(x,t) \to u_1(x)$逐点成立。在$s$的一个非常小的范围内,这验证了Barceló、Bennett、Carbery和Rogers的一个猜想。更一般地,对于$n \geq 4$和$1/2 < s < n/4$,在$\mathbb{R}^{n+1}$中获得了例外集界限的部分改进。
英文摘要:
It is shown that if $u$ solves the wave equation in $\mathbb{R}^{4+1}$ with initial data $u(\cdot,0) = u_0(\cdot) \in H^s$ and $\partial_tu(\cdot,0) = u_1(\cdot ) \in H^{s-1}$, where $0.5 < s \leq 0.55$, then $u(x,t) \to u_0(x)$ and $\partial_tu(x,t) \to u_1(x)$ pointwise as $t \to 0$, for all $x$ outside an exceptional set of Hausdorff dimension at most $6-4s$. In a very small range of $s$, this verifies a conjecture of Barceló, Bennett, Carbery, and Rogers. More generally, a partial improvement to the exceptional set bound in $\mathbb{R}^{n+1}$ is obtained for $n \geq 4$ and $1/2 < s < n/4$.