Padmanabhan, T. (2004) Entropy of Static Spacetimes and Microscopic Density of States. Classical and Quantum Gravity, 21, 4485. arXiv:gr-qc/0308070
https://doi.org/10.1088/0264-9381/21/18/013

has been cited by the following article:

• TITLE: Entropy of Causal Horizons

  AUTHORS: Eric M. Howard

  KEYWORDS: Black Hole Entropy, Causal Horizon, Black Hole Horizon, Black Hole Thermodynamics, Rindler Spacetime, Rindler Horizon, Quantum Gravity, Thermodynamics of Spacetime

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.4 No.12, December 29, 2016

  ABSTRACT: We analyze spacetimes with horizons and study the thermodynamic aspects of causal horizons, suggesting that the resemblance between gravitational and thermodynamic systems has a deeper quantum mechanical origin. We find that the observer dependence of such horizons is a direct consequence of associating a temperature and entropy to a spacetime. The geometrical picture of a horizon acting as a one-way membrane for information flow can be accepted as a natural interpretation of assigning a quantum field theory to a spacetime with boundary, ultimately leading to a close connection with thermodynamics.