PIRSA:17110055

Video URL

https://pirsa.org/17110055

Light Cone Thermodynamics

De Lorenzo, T. (2017). Light Cone Thermodynamics. Perimeter Institute for Theoretical Physics. https://pirsa.org/17110055

De Lorenzo, Tommaso. Light Cone Thermodynamics. Perimeter Institute for Theoretical Physics, Nov. 30, 2017, https://pirsa.org/17110055 

          @misc{ scivideos_PIRSA:17110055,
            doi = {10.48660/17110055},
            url = {https://pirsa.org/17110055},
            author = {De Lorenzo, Tommaso},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Light Cone Thermodynamics},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2017},
            month = {nov},
            note = {PIRSA:17110055 see, \url{https://scivideos.org/index.php/pirsa/17110055}}
          }

Tommaso De Lorenzo SDG Group

Talk numberPIRSA:17110055
DOI10.48660/17110055
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

In this talk, I will show that light cones in MInkowski spacetime are a beautiful analoue of black hole horizons in curved spacetime. To do so, I will prove the analogue of the four laws of black hole thermodynamics in this setting. This is what we called light cone thermodynamics. More precisely, I will consider null surfaces defined by the out-going and in-falling wave fronts emanating from and arriving at a sphere in Minkowski spacetime. Such null surfaces, made of pieces of light cones, are bifurcate conformal Killing horizons for suitable conformally stationary observers. They can be extremal and non-extremal depending on the radius of the shining sphere. Such conformal Killing horizons have a constant light cone (conformal) temperature, given by the standard expression in terms of the surface gravity. Considering exchanges of conformally invariant energy across the conformal horizon, one can prove, in perturbation theory, a first law where entropy changes are given by 1/4 of the changes of the area of the bifurcate surface in Planck units. In the extremal case they become light cones associated with a single event; these have vanishing temperature as well as vanishing entropy. I will conclude with possible generalisations and applications of such results.