Spacetime Foam Model of the Schwarzschild Horizon
Jarmo Makela, Ari Peltola

TL;DR
This paper proposes a spacetime foam model where the Schwarzschild horizon is made up of Planck-scale black holes, explaining the black hole entropy as proportional to the horizon area with a specific proportionality constant.
Contribution
It introduces a novel spacetime foam model of the Schwarzschild horizon that accounts for black hole entropy in terms of Planck-scale black holes.
Findings
Entropy proportional to horizon area
Proportionality constant equals one quarter in natural units
Geometrical arguments support the model
Abstract
We consider a spacetime foam model of the Schwarzschild horizon, where the horizon consists of Planck size black holes. According to our model the entropy of the Schwarzschild black hole is proportional to the area of its event horizon. It is possible to express geometrical arguments to the effect that the constant of proportionality is, in natural units, equal to one quarter.
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