Gravitational Thermodynamics of Causal Diamonds

02.05.2019 15:30 – 16:30

Black hole (more generally, horizon) thermodynamics is a window into quantum gravity. In this talk we discuss whether horizon thermodynamics can be quasi-localized. A special case is the static patch of de Sitter space, known since the work of Gibbons and Hawking to admit a thermodynamic equilibrium interpretation. It turns out this interpretation makes sense only if a negative temperature is assigned to the state. I'll discuss this example, and its generalization to all causal diamonds in maximally symmetric spacetimes. This story includes a Smarr formula and first law of causal diamonds, analogous to those of black hole mechanics. If time permits I’ll show a new derivation of the Einstein equation based on an equilibrium condition for the free energy of small diamonds.

Lieu

Bâtiment: Ecole de Physique

Salle 234

entrée libre