PIRSA:25030158

Video URL

https://pirsa.org/25030158

Dressed Subsystems in Gravitational Theory

Pulakkat, P. (2025). Dressed Subsystems in Gravitational Theory. Perimeter Institute for Theoretical Physics. https://pirsa.org/25030158

Pulakkat, Pranav. Dressed Subsystems in Gravitational Theory. Perimeter Institute for Theoretical Physics, Mar. 03, 2025, https://pirsa.org/25030158 

          @misc{ scivideos_PIRSA:25030158,
            doi = {10.48660/25030158},
            url = {https://pirsa.org/25030158},
            author = {Pulakkat, Pranav},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Dressed Subsystems in Gravitational Theory},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2025},
            month = {mar},
            note = {PIRSA:25030158 see, \url{https://scivideos.org/pirsa/25030158}}
          }

Pranav Pulakkat University of Maryland, College Park

Talk numberPIRSA:25030158
DOI10.48660/25030158
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Local subsystems play a fundamental role in theoretical physics, but they are usually defined in terms of background spacetime structures, in particular a Lorentzian metric. In gravity there are no such structures and the metric becomes dynamical. I will argue that nevertheless subsystems can be constructed in relation to other degrees of freedom, subject to the requirement that those variables reside within the subsystem itself. In operational terms an observer located within the system should be able to determine its edge by taking measurements within that region only. Within the context of classical field theory, I will demonstrate that this guarantees that the observables describing the system constitute a closed Poisson algebra. I'll discuss some examples, explain how surface charges generating subsystem symmetries, including the Bekenstein-Hawking area entropy, are incorporated, and make some remarks about how this can be extended to a fully quantum treatment within the framework of deformation quantization.