2018 Fiscal Year Annual Research Report
Black Holes and Cosmology in Holographic Duality and Gravitational Waves
| Project/Area Number |
18F18315
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| Research Institution | Kyoto University |
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Principal Investigator |
向山 信治 京都大学, 基礎物理学研究所, 教授 (40396809)
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| Co-Investigator(Kenkyū-buntansha) |
ZHANG YUN-LONG 京都大学, 基礎物理学研究所, 外国人特別研究員
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| Project Period (FY) |
2018-11-09 – 2021-03-31
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| Keywords | gravitation / cosmology / holographic principle / gravitatioal waves |
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| Outline of Annual Research Achievements |
Yun-Long Zhang has published three papers on journals with collaborators in the following list. As the co-corresponding author, it took much time of him to respond to the referees and revise the manuscript in FY 2018(Nov.12-).
[1]. Zhang studied the fluctuation of the string world-sheet geometry in (4+1) dimensional Anti-de Sitter space-time, which is dual to the Bell inequality of entangled pair on the boundary, based on the holographic model of Einstein-Podolsky-Rosen pair. This paper clearly presented the duality between classical string gravity and lower dimensional quantum state.
[2]. Zhang studied the possible method to detect entanglement photos from the cosmic microwave background. It is inspired by the entanglement enabled intensity interferometry (Cotler and Wilczek), based on the Hanbury Brown Twiss interferometry and it is helpful to the detection of primordial gravitational waves.
[3]. Zhang studied the properties of a black hole with the weak disorder, and presented the renormalization flow of holographic entanglement entropy, running from a conformal theory to a Lifshitz field theory.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Zhang has investigated the worldsheet geometry of string in the bulk gravity, which is proposed as the holographic dual of the lower energy limit of quantum Sachdev-Ye-Kitaev model with the Schwarzian action. The manuscript is under revising with Rong-Gen Cai, Shan-Ming Ruan, Run-Qiu Yang in arXiv: 1709.06297.
Zhang has investigated the holographic model of the emergent dark universe, as well as reconstructing the effective potential in the late time accelerating universe. The manuscript is under revising with Rong-Gen Cai, Sunly Khimphun, Bum-Hoon Lee, Sichun Sun, G. Tumurtushaa in arXiv: 1812.11105.
Mukohyama and Zhang are investigating the swampland conjecture in Dirac-Born-Infeld inflation model in cosmology, which is induced from higher dimensional space-time. We also studied the de Sitter swampland conjecture and Bousso bound in more details. The manuscript is under drafting with Shuntaro Mizuno and Shi Pi.
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| Strategy for Future Research Activity |
These topics above are all within or closely relevant to our previous proposal to JSPS. Based on the progress, Prof. Mukohyama and Dr. Zhang are planning to promote the following topics in FY2019 for future work.
Investigating the emergent geometry and gravity from stress-energy tensor of lower dimensional field theories, with the methods from gradient flow and holographic hydrodynamics. This work will enhance the close connection between gravity and quantum matters.
Investigating the gravitational wave radiation and super-radiance from Kerr black hole, e.g. in the Chern-Simons modified gravity with Zhanfeng Mai. Some suitable approximations from holography are also helpful in the studies, and it is quite interesting to explore this topic, which could be relevant to astronomical observations.
Investigating the quasi-normal modes of alternative scenarios of black holes, such as membrane fluid or other holographic models, together with the echoes of gravitational waves. This study will be quite important to study the new physics and quantum effects surrounding the horizon of the black hole.
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