LETTER TO THE EDITOR: Quantum horizons and black-hole entropy: inclusion of distortion and rotation

@article{Ashtekar2004LETTERTT,
  title={LETTER TO THE EDITOR: Quantum horizons and black-hole entropy: inclusion of distortion and rotation},
  author={Abhay Ashtekar and J S Engle and Chris van den Broeck},
  journal={Classical and Quantum Gravity},
  year={2004}
}
Equilibrium states of black holes can be modelled by isolated horizons. If the intrinsic geometry is spherical, they are called type I while if it is axi-symmetric, they are called type II. The detailed theory of the geometry of quantum type I horizons and the calculation of their entropy can be generalized to type II, thereby including arbitrary distortions and rotations. The leading term in entropy of large horizons is again given by 1/4th of the horizon area for the same value of the Barbero… 
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