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Spacetime Equilibrium at Negative Temperature and the Attraction of Gravity
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gr-qchep-th
keywords
diamondgravitytemperatureabsoluteattractionattractivenesscausalcondition
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We derive the Einstein equation from the condition that every small causal diamond is a variation of a flat empty diamond with the same free conformal energy, as would be expected for a near-equilibrium state. The attractiveness of gravity hinges on the negativity of the absolute temperature of these diamonds, a property we infer from the generalized entropy.
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