Cosmology from random entanglement


Antonini, S. (2023). Cosmology from random entanglement. Perimeter Institute. https://pirsa.org/23110043


Antonini, Stefano. Cosmology from random entanglement. Perimeter Institute, Nov. 01, 2023, https://pirsa.org/23110043


          @misc{ pirsa_PIRSA:23110043,
            doi = {10.48660/23110043},
            url = {https://pirsa.org/23110043},
            author = {Antonini, Stefano},
            keywords = {Quantum Information},
            language = {en},
            title = {Cosmology from random entanglement},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {nov},
            note = {PIRSA:23110043 see, \url{https://pirsa.org}}

Stefano Antonini University of Maryland, College Park


Obtaining a description of cosmology is a central open problem in holography. Studying simple models can help us gain insight on the generic properties of holographic cosmologies. In this talk I will describe the construction of entangled microstates of a pair of holographic CFTs whose dual semiclassical description includes big bang-big crunch AdS cosmologies in spaces without boundaries. The cosmology is supported by inhomogeneous heavy matter and it partially purifies the bulk entanglement of two auxiliary AdS spacetimes. In generic settings, the cosmology is an entanglement island contained in the entanglement wedge of one of the two CFTs. I will then describe the properties of the non-isometric bulk-to-boundary encoding map and comment on an explicit, state-dependent boundary representation of operators acting on the cosmology. Finally, if time allows, I will argue for a non-isometric to approximately-isometric transition of the encoding of "simple" cosmological states as a function of the bulk entanglement, with tensor network toy models of the setup as a guide.


Zoom link https://pitp.zoom.us/j/93483219872?pwd=TGpJVVlaNDVGWTN5ZHpkTHp6a2hTZz09