arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.06387gr-qcmath.AP
收藏

具有小的非衰减一阶项的次极值Kerr时空上的波动方程

The wave equation on subextremal Kerr spacetimes with small non-decaying first order terms

Gustav Holzegel, Christopher Kauffman

摘要:

本文研究了在固定的次极值Kerr时空$\left(\mathcal{M},g_{M,a}\right)$外部的扰动协变波动方程$\Box_{g_{M,a}} Ψ= \varepsilon \mathbf{B} Ψ$.这里$\mathbf{B}$是一个适当的正规一阶微分算子尊重克尔的对称性,其系数被假定为在空间中衰减,但不是在时间。我们建立了相关的柯西问题的解决方案的集成衰减估计。该证明采用了Dafermos-Rodnianski-Shlapentokh-Rothman \cite{DRSR}在$\varepsilon=0$情况下引入的框架。我们结合他们的估计与一个新的全球pseudodifferential换向器估计,这概括了我们以前的工作在史瓦西的情况下。换向器的构造利用了\cite{DRSR}的中心观测,即超辐射频率不会被捕获。另一个主要的技术成分的证明包括在建立适当的卷积估计所产生的表达式的相互作用的$\mathbf{B}$长期和时间截止的microlocal框架。

英文摘要:

We consider the perturbed covariant wave equation $\Box_{g_{M,a}} Ψ= \varepsilon \mathbf{B} Ψ$ on the exterior of a fixed subextremal Kerr spacetime $\left(\mathcal{M},g_{M,a}\right)$. Here $\mathbf{B}$ is a suitably regular first order differential operator respecting the symmetries of Kerr whose coefficients are assumed to decay in space but not in time. We establish integrated decay estimates for solutions of the associated Cauchy problem. The proof adapts the framework introduced by Dafermos--Rodnianski--Shlapentokh-Rothman \cite{DRSR} in the $\varepsilon=0$ case. We combine their estimates with a new global pseudodifferential commutator estimate, which generalises our previous work in the Schwarzschild case. The construction of the commutator exploits the central observation of \cite{DRSR} that superradiant frequencies are not trapped. A further major technical ingredient of the proof consists in establishing appropriate convolution estimates for expressions arising from the interplay of the $\mathbf{B}$-term and the time cutoffs in the microlocal 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。

↑