ICTS:29470

Video URL

de Sitter space, extremal surfaces and time entanglement

de Sitter space, extremal surfaces and time entanglement

(2024). de Sitter space, extremal surfaces and time entanglement. SciVideos. https://youtube.com/live/gYZ3TEDSmiY

de Sitter space, extremal surfaces and time entanglement. SciVideos, Aug. 28, 2024, https://youtube.com/live/gYZ3TEDSmiY 

          @misc{ scivideos_ICTS:29470,
            doi = {},
            url = {https://youtube.com/live/gYZ3TEDSmiY},
            author = {},
            keywords = {},
            language = {en},
            title = {de Sitter space, extremal surfaces and time entanglement},
            publisher = {},
            year = {2024},
            month = {aug},
            note = {ICTS:29470 see, \url{https://scivideos.org/icts-tifr/29470}}
          }
K. Narayan
Talk numberICTS:29470
Source RepositoryICTS-TIFR
Source EventQuantum Information, Quantum Field Theory and Gravity
Collection

Abstract

I will describe extremal surfaces in de Sitter space anchored at the future boundary I+. Since such surfaces do not return, they require extra data in the past. In entirely Lorentzian dS, this leads to future-past timelike surfaces stretching between I+/I-, with pure imaginary area (relative to spacelike surfaces in AdS). With a no-boundary type boundary condition, the top half of these joins with a spacelike part on the hemisphere giving a complex-valued area. These can be thought of as certain analytic continuations from AdS while also amounting to space-time rotations. The areas are best interpreted as pseudo-entropy or time-entanglement (entanglement-like structures with timelike separations). I will also briefly discuss multiple subregions, entropy relations, the pseudo-entanglement wedge, a heuristic Lewkowycz-Maldacena formulation, as well as aspects in toy models in quantum mechanics, involving the time evolution operator, reduced transition amplitudes, and future-past entangle...