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Article Dans Une Revue Physical Review D Année : 2014

Spacetime thermodynamics without hidden degrees of freedom

Résumé

A celebrated result by Jacobson is the derivation of Einstein's equations from Unruh's temperature, the Bekenstein-Hawking entropy and the Clausius relation. This has been repeatedly taken as evidence for an interpretation of Einstein's equations as equations of state for unknown degrees of freedom underlying the metric. We show that a different interpretation of Jacobson result is possible, which does not imply the existence of additional degrees of freedom, and follows only from the quantum properties of gravity. We introduce the notion of quantum gravitational Hadamard states, which give rise to the full local thermodynamics of gravity.
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hal-00957705 , version 1 (12-09-2023)

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Goffredo Chirco, Hal M. Haggard, Aldo Riello, Carlo Rovelli. Spacetime thermodynamics without hidden degrees of freedom. Physical Review D, 2014, 90 (4). ⟨hal-00957705⟩
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