Classical censorship permits AdS₅-Kerr black holes with arbitrarily large angular momenta per unit mass, which does not seem reasonable from a holographic point of view. However, it has been shown that, when these black holes are embedded in string theory, their angular momentum per unit mass is in fact bounded by , where L is the asymptotic curvature scale. One might suppose that the most rapidly rotating AdS₅-Kerr black holes, with angular momentum per unit mass close to this bound, might be unstable, for example, to a superradiant instability. We show that this is not always true: there is a small domain in the AdS₅-Kerr parameter space corresponding to black holes which are stable against superradiance and yet nearly saturate the stringy bound.

经典审查允许 AdS ₅ -Kerr 黑洞具有任意大的每单位质量角动量，这从全息的角度来看似乎不合理。然而，已经表明，当这些黑洞被嵌入弦理论时，它们每单位质量的角动量实际上以 为界，其中L是渐近曲率尺度。人们可能会假设，旋转速度最快的 AdS ₅ -Kerr 黑洞，每单位质量的角动量接近这个界限，可能是不稳定的，例如，超辐射不稳定性。我们表明这并不总是正确的：AdS _{5 中}有一个小域-Kerr 参数空间对应于对超辐射稳定但几乎饱和字符串边界的黑洞。