Quantum Geometry and Black Holes
http://arxiv.org/abs/gr-qc/9804039Review article (graduate level) by Abhay Ashtekar and Kirill Krasnov (Penn State University) about how to explain black hole thermodynamics using the methods of non-perturbative quantum general relativity.
Submitted in section: Physics: Relativity: Black Holes: Thermodynamics: Quantum Geometry and Black Holes