4.4 Article

Black hole collisions, instabilities, and cosmic censorship violation at large D

期刊

JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 9, 页码 -

出版社

SPRINGER
DOI: 10.1007/JHEP09(2019)099

关键词

Black Holes; Spacetime Singularities

资金

  1. ERC [GravBHs-692951]
  2. MEC [FPA2016-76005-C2-2-P]
  3. Ministerio de Educacion, Cultura y Deporte [FPU15/01414]
  4. Perimeter Institute for Theoretical Physics, through the Visiting Graduate Fellowship program
  5. Perimeter Institute for Theoretical Physics
  6. Government of Canada through the Department of Innovation, Science, and Economic Development
  7. Province of Ontario through the Ministry of Research and Innovation

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We study the evolution of black hole collisions and ultraspinning black hole instabilities in higher dimensions. These processes can be efficiently solved numerically in an effective theory in the limit of large number of dimensions D. We present evidence that they lead to violations of cosmic censorship. The post-merger evolution of the collision of two black holes with total angular momentum above a certain value is governed by the properties of a resonance-like intermediate state: a long-lived, rotating black bar, which pinches off towards a naked singularity due to an instability akin to that of black strings. We compute the radiative loss of spin for a rotating bar using the quadrupole formula at finite D, and argue that at large enough D - very likely for D greater than or similar to 8, but possibly down to D = 6 - the spin-down is too inefficient to quench this instability. We also study the instabilities of ultraspinning black holes by solving numerically the time evolution of axisymmetric and non-axisymmetric perturbations. We demonstrate the development of transient black rings in the former case, and of multi-pronged horizons in the latter, which then proceed to pinch and, arguably, fragment into smaller black holes.

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