Entropy of Spacelike Two-Surfaces of Spacetime
classification
🌀 gr-qc
keywords
two-surfaceentropyspacelikespacetimeapparentareaarguebecome
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We argue that every finite piecewise smooth spacelike two-surface of spacetime possesses an entropy which is, in natural units, one quarter of its area. However, the thermodynamical properties of a two-surface become apparent only to the observers having that two-surface as a horizon. Consequences of this result are discussed.
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