The Entropy of Higher Dimensional Nonrotating Isolated Horizons from   Loop Quantum Gravity
  In this paper, we extend the calculation of the entropy of the nonrotating isolated horizons in 4 dimensional spacetime to that in a higher dimensional spacetime. We show that the boundary degrees of freedom on an isolated horizon can be described effectively by a punctured $SO(1,1)$ BF theory. Then the entropy of the nonrotating isolated horizon can be calculated out by counting the microstates. It satisfies the Bekenstein-Hawking law. 
Jingbo Wang, Chao-Guang Huang
gr-qc