or so it is claimed in this paper: Huan Yang, Aaron Zimmerman, Luis Lehner: Turbulent black holes http://arxiv.org/abs/1402.4859 However: 1. "turbulence" of the sort I am used to, features energy flowing from lower spatial frequencies into higher ones. This is the opposite. They don't care. 2. it is well known that the Kerr "spinning black hole" metric is unique, stationary, and perturbations to it die out exponentially. They claim precisely such an isolated black hole is "turbulent." So how can such a scenario be claimed "turbulent?" More like "boring, and proven to be so, for many years now." (They do not cite the uniqueness theorems.) So I don't understand them. My initial guess would be: this is overhyped baloney and they are desperately trying to take some incredibly minor and unimportant result, and act like it is important. But feel free to correct me.