| Project/Area Number |
22K20370
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0203:Particle-, nuclear-, astro-physics, and related fields
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| Research Institution | Kyoto University |
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Principal Investigator |
ruan shanming 京都大学, 基礎物理学研究所, 特定研究員 (90953307)
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | de Sitter space / de Sitter Holography / Holographic Complexity / AdS/CFT Correspondence / Black Hole / Singularity / de Sitter / dS Holography / Double Holography / Holographic complexity / Quantum Information / AdS/CFT correspondence / Quantum Extremal Island |
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| Outline of Research at the Start |
The connection of quantum gravity with quantum information allows for a fruitful collaboration between distinct disciplines and communities. Previous developments have shown that fresh insights and techniques from quantum information theory can deepen our understanding of the same fundamental problems in quantum field theory, condensed matter physics, and quantum gravity. This research aims at applying the viewpoints and tools in quantum information theory to cosmological spacetimes and will give us insights into understanding our universe from the viewpoints of entanglement and holography.
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| Outline of Final Research Achievements |
This research project explored new perspectives on the intersection of quantum information theory and quantum gravity. Specifically, we proposed a new version of de Sitter (dS) holography by cutting the global dS space with a timelike boundary. By exploring the holographic entanglement entropy in half de Sitter space, we demonstrated that gravity in a (d+1)-dimensional half dS space is dual to a highly non-local field theory residing on its d-dimensional de Sitter boundary. This non-locality is reflected by the violation of the subadditivity of holographic entanglement entropy.
Additionally, based on the "complexity=anything" proposal, we introduced infinite codimension-zero gravitational observables as new candidates for holographic complexity. These observables exhibit universal features such as linear growth over time and the switchback effect. We also applied this proposal to investigate the interior geometry of AdS black holes and probe the black hole singularity.
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| Academic Significance and Societal Importance of the Research Achievements |
Our research bridges quantum information theory, and quantum computing with quantum gravity, offering fresh insights into the enigmas of black holes and cosmology spacetime. de Sitter holography may provide new perspectives on understanding the universe's origin and evolution.
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