title: Turbulent black holes.
abstract: We demonstrate that rapidly spinning black holes can display a new type of nonlinear parametric instability-which is triggered above a certain perturbation amplitude threshold-akin to the onset of turbulence, with possibly observable consequences. This instability transfers from higher temporal and azimuthal spatial frequencies to lower frequencies-a phenomenon reminiscent of the inverse cascade displayed by (2+1)-dimensional fluids. Our finding provides evidence for the onset of transitory turbulence in astrophysical black holes and predicts observable signatures in black hole binaries with high spins. Furthermore, it gives a gravitational description of this behavior which, through the fluid-gravity duality, can potentially shed new light on the remarkable phenomena of turbulence in fluids.
authors.affiliation: Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L2Y5, Canada.|Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Huan
authors.initials: H
authors.lastname: Yang
authors.affiliation: Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, Ontario M5S3H8, Canada.
authors.forename: Aaron
authors.initials: A
authors.lastname: Zimmerman
authors.affiliation: Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L2Y5, Canada.
authors.forename: Luis
authors.initials: L
authors.lastname: Lehner