PIRSA:23110054

Exploring causality in braneworld/cutoff holography via holographic scattering

Mori, T. (2023). Exploring causality in braneworld/cutoff holography via holographic scattering. Perimeter Institute. https://pirsa.org/23110054

Mori, Takato. Exploring causality in braneworld/cutoff holography via holographic scattering. Perimeter Institute, Nov. 08, 2023, https://pirsa.org/23110054 

          @misc{ pirsa_PIRSA:23110054,
            doi = {10.48660/23110054},
            url = {https://pirsa.org/23110054},
            author = {Mori, Takato},
            keywords = {Quantum Information},
            language = {en},
            title = {Exploring causality in braneworld/cutoff holography via holographic scattering},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {nov},
            note = {PIRSA:23110054 see, \url{https://pirsa.org}}
          }

Takato Mori Perimeter Institute for Theoretical Physics

DOI 10.48660/23110054
Collection
Talk Type Scientific Series
Subject

Abstract

Holography with branes and/or cutoff surfaces presents a promising approach to studying quantum gravity beyond asymptotically anti-de Sitter spacetimes. However, this generalized holography is known to face several inconsistencies, including potential violations of causality and fundamental entropic inequalities. In this talk, we address these challenges by investigating the bulk scattering process and its holographic realization. Specifically, we propose that causality of a radially propagating excitation should be an induced one originating from a fictitious boundary behind the brane/cutoff surface. We present its consistency by checking the connected wedge theorem supported from quantum cryptography and (strong) subadditivity of holographic entanglement entropies. While the induced light cone seemingly permits superluminal signaling, we argue that this causality violation can be an artifact of state preparation in our picture. This talk is based on 2308.00739 [10.1007/JHEP10(2023)104] with Beni Yoshida.

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Zoom link https://pitp.zoom.us/j/98252951858?pwd=RVNZUjNVM2JkZXRlSXJVbEZ6cUpsUT09