Research edition 04 / 20 October 2026

Thermodynamics of Spacetime: The Einstein Equation of State

A conditional thermodynamic derivation of Einstein equations; a competing explanatory approach, not evidence that every geometry is emergent.

Source and scope

Ted Jacobson · 1995 · Physical Review Letters 75, 1260–1263

A conditional thermodynamic derivation of Einstein equations; a competing explanatory approach, not evidence that every geometry is emergent.

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Full-text passage checked. arXiv gr-qc/9504004v2, p.6, local-equilibrium paragraph.

local equilibrium conditions

Derivation assumes horizon entropy, Unruh temperature and local equilibrium. It does not establish NetPhysics ontology.