Causality at the End-of-World

          @misc{ pirsa_23050121,
            doi = {10.48660/23050121},
            url = {https://pirsa.org/23050121},
            author = {Yoshida, Beni},
            keywords = {Quantum Gravity, Cosmology},
            language = {en},
            title = {Causality at the End-of-World},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {may},
            note = {PIRSA:23050121 see, \url{https://pirsa.org}}
          }
          

Abstract

The success of the AdS/CFT correspondence motivates a holographic approach for spacetime beyond AdS, including our own universe. One possible method involves using an asymptotically-AdS holography and introducing a finite radial cutoff by inserting an End-of-World (EoW) brane. However, previous studies have shown that this leads to nonlocal effects on the boundary and violates entanglement sub-additivity. In this work, we address these issues by examining a two-particle scattering process through the lens of holographic quantum tasks. Our findings suggest that connectedness of entanglement wedge does indeed require nonlocal domain of dependence, but that violation of sub-additivity can be avoided. We also discuss an important question that arises from our results, namely whether the non-locality on the EoW brane is real or apparent. We argue that it is the latter. This talk is based on ongoing work with Takato Mori.