Foundations of Physics

, Volume 33, Issue 2, pp 279–296 | Cite as

Black-Hole Entropy as Causal Links

  • Djamel Dou
  • Rafael D. Sorkin


We model a black hole spacetime as a causal set and count, with a certain definition, the number of causal links crossing the horizon in proximity to a spacelike or null hypersurface Σ. We find that this number is proportional to the horizon's area on Σ, thus supporting the interpretation of the links as the “horizon atoms” that account for its entropy. The cases studied include not only equilibrium black holes but ones far from equilibrium.

black holes causal sets quantum gravity discrete spacetime horizon entropy statistical mechanics 


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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • Djamel Dou
    • 1
  • Rafael D. Sorkin
    • 2
  1. 1.Institute of Exact Science and TechnologyUniversity Center of ElouedElouedAlgeria
  2. 2.Department of PhysicsSyracuse UniversitySyracuse

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