Thermodynamics of spacetime

          @misc{ scivideos_PIRSA:06090001,
            doi = {10.48660/06090001},
            url = {https://pirsa.org/06090001},
            author = {Jacobson, Ted},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Thermodynamics of spacetime },
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2006},
            month = {sep},
            note = {PIRSA:06090001 see, \url{https://scivideos.org/pirsa/06090001}}
          }
          

Abstract

I will first argue that the notion of black hole entropy extends universally to causal horizons. Then I will deduce the causal dynamics of spacetime from the equilibrium thermodynamics of causal horizons. Specifically, it will be shown how the Clausius relation dS = dQ/T between entropy change, energy flux, and acceleration temperature for all local causal horizons implies the Einstein equation, with Newton's constant determined by the universal horizon entropy density. Implications, non-equilibrium processes, and relations to AdS/CFT duality will also be discussed.