Ensembles of open quantum systems as a tool for quantum spacetime

          @misc{ pirsa_PIRSA:25030059,
            doi = {10.48660/25030059},
            url = {https://pirsa.org/25030059},
            author = {Shandera, Sarah},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Ensembles of open quantum systems as a tool for quantum spacetime},
            publisher = {Perimeter Institute},
            year = {2025},
            month = {mar},
            note = {PIRSA:25030059 see, \url{https://pirsa.org}}
          }
          

Abstract

Observers in a typical gravitational or cosmological setting only have access to part of the spacetime and the degrees of freedom in it. The observer sees an open quantum system, and the complete dynamics of all degrees of freedom can be reconstructed by gluing together the (possibly overlapping) open systems associated with each observer. I will discuss what can be learned from treating familiar laboratory closed systems as ensembles of open systems, and how we can begin to extrapolate from there to systems relevant for cosmology.