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2020-07-09
プレスリリース
蒸発するブラックホールの内部を理論的に記述
理化学研究所（理研）数理創造プログラムの横倉祐貴上級研究員らの共同研究チームは、量子力学と一般相対性理論を用いて、蒸発するブラックホールの内部を理論的に記述しました。 本研究成果は、ブラックホールの正体に迫るものであり、遠い未来、情報を蓄えるデバイスとしてブラックホールを活用する「ブラックホール工学」の基礎理論になると期待できます。 本研究は、オンライン科学雑誌『Universe』（6月4日付）に掲載されました。
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2020-05-21
今週の論文Week 4 of May
Title: Test of Eigenstate Thermalization Hypothesis Based on Local Random Matrix Theory Author: Shoki Sugimoto, Ryusuke Hamazaki, Masahito Ueda arXiv: http://arxiv.org/abs/2005.06379v1 Title: Black Hole as a Quantum Field Configuration Author: Hikaru Kawai, Yuki Yokokura arXiv: http://arxiv.org/abs/2002.10331v3 Title: F_K / F_π from Möbius Domain-Wall fermions solved on gradient-flowed HISQ ensembles Author: Nolan Miller, Henry Monge-Camacho, Chia Cheng Chang, Ben Hörz, Enrico Rinaldi, Dean Howarth, Evan Berkowitz, David A. Brantley, Arjun Singh Gambhir, Christopher Körber, Christopher J. Monahan, M. A. Clark, Bálint Joó, Thorsten Kurth, Amy Nicholson, Kostas Orginos, Pavlos Vranas, André Walker-Loud arXiv: http://arxiv.org/abs/2005.04795v2
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2020-04-20
今週の注目論文
Paper: Black Hole as a Quantum Field Configuration
What's going on inside black holes? The observations to date have taught us the nature of black holes outside and around it, but it does not tell us anything about the inside yet. This is because black holes are "almost" black: gravity is so strong that physical signals from the inside "almost" never come out. So, how can we search for the interior of black holes? It is necessary to return to the basic principles of physics and reconsider what a black hole is. In this paper, we succeeded in describing the inside of black holes based on general relativity and quantum mechanics (quantum field theory). What is important here is a fact that black holes evaporate: According to quantum mechanics, black holes emit weak light, slowly lose energy, and eventually evaporate (Hawking radiation). By taking in this effect from the beginning and analyzing the collapsing process of stars, we obtained the following result: The black hole is a compact object with a surface (instead of horizon) that looks like a conventional black hole from the outside and eventually evaporates without a singularity. (See figure.) Indeed, we explained why this picture can be achieved in quantum field theory. In addition, we investigated how much information is contained inside and showed that the amount (entropy) is given by the surface area. We also described how the energy decreases. This work provides the first field-theoretical formulation of the black hole, and I think it will be the basis for investigating how the information that enters the black hole will go out.
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2019-07-18
ホットトピック
Summary of the 1-day Workshop on Quantum Gravity
What is spacetime? In order to discuss this fundamental question, we held "1-day Workshop on Quantum Gravity" on July 4, 2019. The talk was very varied. First, Yokokura introduced a formulation of black holes as a configuration of quantum fields. Next, Prof. Izumi discussed the relation of S-matrix unitarity and renormalizability in higher-derivative theories. After lunch, Prof. Ho developed a general discussion of the relationship between dynamical horizon and negative energy. Prof. Yoneya began with the origin of Nambu dynamics and introduced an attempt to quantize it with a Hamilton-Jacobi method. Prof. Matsuo discussed M-theory and a mathematical structure behind it. Finally, Prof. Kawai developed a simple model of how the weak scale comes out of the Planck scale. In addition, there was more applications than expected, and the room was a little small. However, the discussion in the physically dense venue was very active as if a concert in a small venue had a stronger feeling of live, and it was a wonderful conference where the enthusiasm of the speakers could be felt directly. And the participants were in a wide range of fields such as elementary particles, relativity and mathematical physics, and over a very wide range of generations, including master's first grader and retired professor. In this way, it was also very meaningful that active discussions were conducted across fields and generations. Now is the time to study quantum gravity with free ideas.