Unravelling the quantum nature of de Sitter spacetime

Project funded by Swedish Research Council (Grant for positions or stipends), grant 2023-03373_VR. Participating organisations named by the source: Stockholm University. Funded amount: SEK 4,000,000, as stated by the source. Runs 2024-01-01 to 2027-12-31. Keywords: Naturvetenskap, Natural Sciences, Fysik, Physical Sciences, Subatomär fysik, Subatomic Physics. Source: OpenAIRE Graph, from the funder's project data (collected by OpenAIRE on 2025-12-05); national funding data, not CORDIS. Abstract given by the source: De Sitter spacetime is the description most consistent with experimental data from the early and late universe but is still ill understood. Regions in de Sitter are cloaked from an observer by a cosmological horizon, which shares many features with the horizon of a black hole. However, the interpretation of its entropy is expected to be fundamentally different from black holes. Another peculiarity of de Sitter spacetime is that a holographic dual (a map to a unitary quantum mechanical system) is unknown.The first main question we aim to answer in this proposal is: if information escapes through the cosmological horizon, is it recoverable by studying the quantum mechanical radiation that is emitted by the horizon like recent advances suggest for black holes? We employ recent advances in brane-world models (or double holography) and pioneer protocols of information recovery in such models beyond two dimensions. The second main question we aim to answer in this proposal is: can we develop a complexity probe to gain insights into the two competing approaches for de Sitter holography? We aim to develop a novel bulk complexity probe that can reproduce Krylov complexity and combine it with conventional holographic complexity to gain insights in how to complement two competing approaches for de Sitter holography.Answering these questions will lead to important breakthroughs on the quantum nature of our universe that will have important knock-on effects for future research.

Original source.

Source: OpenAIRE Graph: projects of national funders, OpenAIRE, from the project data of Swedish Research Council. Retrieved 2026-10-28. Licence: Creative Commons Attribution 4.0 (OpenAIRE Graph). Selected metadata, adapted presentation; the publisher's record is authoritative. No endorsement by the source is implied. Licence: Creative Commons Attribution 4.0 (CC BY 4.0).

AI-assisted summary: Project funded by the Swedish Research Council, SEK 4,000,000, 2024-2027, Stockholm University. Investigates quantum nature of de Sitter spacetime, focusing on information recovery through cosmological horizons. Suggested technology pillar: enabling. Generated by AI from the public source text; it may contain errors and the original source is authoritative.