Breaking away from the near horizon of extreme Kerr

Jun 21, 2019
16 pages
Published in:
  • SciPost Phys. 8 (2020) 6, 089
  • Published: Jun 17, 2020
e-Print:
DOI:

Citations per year

201920202021202220230246810
Abstract: (arXiv)
We study gravitational perturbations around the near horizon geometry of the (near) extreme Kerr black hole. By considering a consistent truncation for the metric fluctuations, we obtain a solution to the linearized Einstein equations. The dynamics is governed by two master fields which, in the context of the nAdS2_2/nCFT1_1 correspondence, are both irrelevant operators of conformal dimension Δ=2\Delta=2. These fields control the departure from extremality by breaking the conformal symmetry of the near horizon region. One of the master fields is tied to large diffeomorphisms of the near horizon, with its equations of motion compatible with a Schwarzian effective action. The other field is essential for a consistent description of the geometry away from the horizon.
Note:
  • v2: typo fixed and reference added; v3: expanded appendix with on-shell action
  • horizon: geometry
  • Einstein equation: linear
  • perturbation: gravitation
  • dimension: conformal
  • metric: fluctuation
  • operator: conformal
  • symmetry: conformal
  • black hole: Kerr
  • effective action
  • field equations