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arXiv 1609.01733gr-qchep-thmath.AP
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微观几何结构上的波传播

Wave propagation on microstate geometries

Joseph Keir

摘要:

超对称微态几何最近被证明是非线性不稳定的,由于数值和启发式的证据,基于存在非常缓慢衰减的解决方案的线性波动方程在这些背景下。在本文中,我们给出了一个彻底的数学处理的线性波动方程的两个和三个电荷的超对称微观几何,发现了一些令人惊讶的结果。在这两种情况下,我们证明了波动方程的解决方案具有一致有界的局部能量,尽管事实上,三个电荷微观状态拥有一个ergoregion;这些几何形状,因此避免弗里德曼的“ergosphere不稳定性”。事实上,在三个电荷的情况下,我们能够构造具有既不增长也不衰减的局部能量的波动方程的解,尽管这些数据必须对卡鲁扎-克莱因坐标有非平凡的依赖性。在两个电荷的情况下,我们构建准模,并使用这些约束的均匀衰减速率,表明这些背景上唯一可能的均匀衰减语句有非常慢的衰减速率。我们发现,这些衰减率是次对数,验证了Eperon等人的数值结果。同样的结构可以在三个电荷的情况下,在这两种情况下,可以选择的数据为准模有平凡的依赖卡鲁扎-克莱因坐标。

英文摘要:

Supersymmetric microstate geometries were recently conjectured to be nonlinearly unstable due to numerical and heuristic evidence, based on the existence of very slowly decaying solutions to the linear wave equation on these backgrounds. In this paper, we give a thorough mathematical treatment of the linear wave equation on both two and three charge supersymmetric microstate geometries, finding a number of surprising results. In both cases we prove that solutions to the wave equation have uniformly bounded local energy, despite the fact that three charge microstates possess an ergoregion; these geometries therefore avoid Friedman's "ergosphere instability". In fact, in the three charge case we are able to construct solutions to the wave equation with local energy that neither grows nor decays, although this data must have nontrivial dependence on the Kaluza-Klein coordinate. In the two charge case we construct quasimodes and use these to bound the uniform decay rate, showing that the only possible uniform decay statements on these backgrounds have very slow decay rates. We find that these decay rates are sub-logarithmic, verifying the numerical results of Eperon et al. The same construction can be made in the three charge case, and in both cases the data for the quasimodes can be chosen to have trivial dependence on the Kaluza-Klein coordinates.

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