Rafael Sorkin
Black Hole Entropy as Causal Links
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 $\Sigma$. We find that this number is proportional
to the horizon's area on $\Sigma $, thus supporting the interpretation
of the links as the "horizon molecules" that account for its
entropy. The cases studied include not only equilibrium black holes
but ones far from equilibrium.
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