BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Vahid Taghiloo DTSTART:20220315T135000Z DTEND:20220315T143000Z DTSTAMP:20260423T004548Z UID:PhysBound/5 DESCRIPTION:Title: Null Surface Thermodynamics\nby Vahid Taghiloo as part of Physics @ Boundaries Workshop\n\n\nAbstract\nIn this talk\, I'm going to formulate t he D-dimensional Einstein gravity in presence of a codimension one null bo undary. As we will see in addition to the bulk degrees of freedom that pro pagate into the bulk we also have to account for the boundary degrees of f reedom that reside at the boundary. A suitable way to label these boundary degrees of freedom is using the surface charges associated with large dif feomorphisms. Surprisingly\, we will also observe these boundary degrees o f freedom describe a thermodynamic system with local laws of thermodynamic s. This thermodynamical system is generally an open system and can be clos ed only when there is no flux of gravitons through the null surface. Local laws of thermodynamics are a manifestation of diffeomorphism invariance o f the theory at the boundary and account for the dynamics of the part of s pacetime behind the boundary. Our analysis extends the usual black hole th ermodynamics to a universal feature of any area element on a generic null surface in a generic diffeomorphism invariant theory of gravity.\n LOCATION:https://researchseminars.org/talk/PhysBound/5/ END:VEVENT END:VCALENDAR