Spacetime thermodynamics without hidden degrees of freedom
by
Goffredo Chirco(Aix Marseille Université)
→
Europe/Berlin
Building 67, SemRm 10 (DESY Hamburg)
Building 67, SemRm 10
DESY Hamburg
Description
A celebrated result by Jacobson is the derivation of the Einstein’s equations from the Unruh’s temperature, the Bekenstein-Hawking entropy and the Clausius relation. This is sometimes taken as evidence for an interpretation of the Einstein’s equations as an 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 discuss in particular the notion of quantum gravitational Hadamard states, which give rise to the full local thermodynamics of gravity.