Featured News
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Ryosuke Iritani gave a scientific outreach talk at Mathcafe on May 14, 2023
On Sunday 14th May, Ryosuke Iritani gave a scientific outreach talk at Mathcafe. He focused on spatial biodiversity as a chief topic and how to use mathematics to estimate, and make inferences for, the biodiversity. He explained the measurement of biodiversity from the axiomatic viewpoint, that is, he explained what properties should be satisfied by the quantity that is supposed to measure biodiversity. He then moved on to explaining an application of generating functions to biodiversity measures. He finished his talk by saying that mathematics is not only useful to science but also a life-time fun hobby.
2023-05-22
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Probing Extreme Gravity with Ringing Black Holes
Naritaka Oshita (Visiting Scientist, iTHEMS) contributed to the chapter “Researches” in the membership journal of the physical society of Japan on the universality in a black hole ringing and its application to probe the near-horizon physics of black holes. Also, a picture relevant to Naritaka Oshita’s research on a black hole ringing was selected as the cover art of the journal. You can visit the following web site of the Physical Society of Japan to access the contributions.
2023-05-08
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Handbook of Protistology
Editor: Euki Yazaki, <i>et al.</i> Language: Japanese Release date: May 10, 2023 This handbook covers a wide range of knowledge and the latest information on evolution, ecology, and the relationship between humans and various studies and new findings that have emerged from research on protists. The recent classification system is also organized. The contents include: What are protists? (cell structure, phylogeny and classification, macroevolution, symbiosis, ecology, model organisms) / Evolution and classification (Amoebozoa, Archaeplastida, Stramenopiles, Alveolata, and others) / Protist structure and ecology (life cycle, structure and function, symbiosis, genomics, environment and ecology, and interactions with humans) / Research methods.
2023-05-08
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RIKEN iTHEMS signed a new MoU with Lawrence Berkeley National Laboratory (LBNL)
Reiner Kruecken (Director of the Nuclear Science Division of LBNL) and Tetsuo Hatsuda (Director of RIKEN iTHEMS) are the principal coordinators for LBNL and RIKEN iTHEMS, respectively, for this MoU [1]. The photo was taken in front of the desk of Ernest Lawrence [2], which is preserved at LBNL.
2023-05-02
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RIKEN Research: Quantum ‘magic’ could help explain the origin of spacetime
A quantum property dubbed ‘magic’ could be the key to explaining how space and time emerged, a new mathematical analysis by three RIKEN physicists suggests [1]. It’s hard to conceive of anything more basic than the fabric of spacetime that underpins the Universe, but theoretical physicists have been questioning this assumption. “Physicists have long been fascinated about the possibility that space and time are not fundamental, but rather are derived from something deeper,” says Kanato Goto of the RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS). To read more, please visit the related link.
2023-04-24
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RIKEN Research: Gravitational waves could indicate transition to strange quark matter
Telltale signatures in gravitational-wave signals from merging neutron stars should reveal what happens to matter at the extreme pressures generated during such mergers, calculations by RIKEN researchers predict [1]. If you took some water and compressed it with a piston, it would shrink as the molecules get pushed closer together. If you continued ramping up the pressure, you’d reach a point where the atoms collapse and form an ultra-dense soup of neutrons and protons. The only place in the Universe where this happens is neutron stars, the collapsed remnants of burned-out stars, and it produces mind-boggling densities—one teaspoon of such material weighs several hundred billion kilograms. But what would happen if you continued to increase the pressure still further? Not even astrophysicists know the answer to that. To read more, please visit the related link.
2023-04-17
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Predicting crypto asset price bursts using the correlation tensor of trading networks - towards secure crypto assets and the digital economy -
Cryptoassets are becoming an integral part of the digital economy. RIKEN and Kyoto University are collaborating on theoretical research to detect anomalous events such as money laundering and fraud, and to predict price bursts, by making full use of the mathematical science of networks. A research group led by Yuichi Ikeda (Professor at Kyoto Univ.), Abhijit Chakraborty (Assistant Professor at Kyoto Univ. and Visiting Research Scientist at RIKEN iTHEMS) and Tetsuo Hatsuda (RIKEN iTHEMS), has developed a novel method to analyse the spectrum of the correlation tensor corresponding to a trading network for cryptographic assets, and has developed a new method for predicting price bursts. They found that the maximum singular value of the tensor shows a significant negative correlation with the price of cryptoasset prices. Using this finding, the group gained the prospect of providing an early indicator of price bursts. For details, please refer to Kyoto University's press release article at the related links below.
2023-03-31
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Condensed Matter Physics and Topology - From the Viewpoint of Noncommutative Geometry
Author: Yosuke Kubota Language: Japanese
2023-03-29
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RIKEN Research: Explanation found for puzzling observation of Shiba states in superconductors
The origin of a mysterious experimental observation in a superconductor with a magnetic impurity sitting on top of it has been revealed in a theoretical study by a RIKEN researcher and a collaborator. This could help realize a robust quantum state residing in a superconductor that may find application in quantum computers. Superconductors conduct electricity without any resistance because electrons in them form pairs that have an energy gap. But placing a magnetic atom on top of a superconductor creates a new state in this energy gap as a result of the atom’s magnetism interacting with the superconductor’s paired electrons. Known as the Yu–Shiba–Rusinov state, or Shiba state for short, this state has been attracting a lot of interest because it could shed light on the emergence of a special state in a topological superconductor called the Majorana zero mode, which is promising for realizing fault-tolerant quantum computing. To read more, please visit the related link.
2023-03-13
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Behavioral Ecology of Plants: their sensory system, communication, memory, and response
Editor: The Society for the Study of Species Biology Language: Japanese Ryosuke Iritani (Research Scientist, iTHEMS) is among the authors. How do plants perceive the world, and how do plants behave? This book is a compilation of the most recent plant environmental response research by up-and-coming scientists for beginners.
2023-01-30
Videos
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What about climate change in actuality?
Odd couples of interdisciplinary research
Khovanov homology theory - an introduction to categorification by Dr. Taketo Sano on May 13, 2022
Fundamentals Fest, mini Pre-event on Science "Exploring and Bridging: The Potential of Basic Science"
In Search of Pc pentaquark - Simulate Hadron Interactions with FUGAKU
AAS Journal Author Series: Hirotaka Ito on 2021ApJ…918...59I
Will Useless Knowledge Change the Future? - What is the Black Hole Recorder?
RIKEN 2019 (in Japanese)
When a Cretan says all Cretans are liars
Physical and local observables in gravitational theory
Can you hear the shape of a drum?
Quantum many-body physics with cold atoms
Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) is an international research program at RIKEN. It facilitates close collaborations among researchers from different disciplines in theoretical, mathematical and computational sciences. The ultimate goal of iTHEMS is to unravel the mystery of the Universe, matter, and life, as well as to solve key problems in modern society through interdisciplinary approaches.
Upcoming Events
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Seminar
Termination of Superradiance from a Binary Companion
June 6 (Tue) at 13:30 - 15:00, 2023
Ms. Huiyu Zhu (Ph.D. Student, Department of Physics, Hong Kong University of Science and Technology, Hong Kong)
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Seminar
Around homogeneous spaces of complex semisimple quantum groups
June 7 (Wed) at 14:00 - 16:30, 2023
Mr. Kan Kitamura (Ph.D. Student, Graduate School of Mathematical Sciences, The University of Tokyo)
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Seminar
Deciphering speciation processes: a mathematical modelling approach to biodiversity patterns
June 8 (Thu) at 10:00 - 11:00, 2023
Dr. Ryo Yamaguchi (Assistant Professor, Department of Advanced Transdisciplinary Sciences, Faculty of Advanced Life Science, Hokkaido University / Postdoctoral Research Fellow, Biodiversity Research Centre, University of British Columbia, Canada)
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Seminar
A Spin on Wave Dark Matter
June 15 (Thu) at 16:00 - 17:30, 2023
Dr. Mustafa Amin (Associate Professor, Department of Physics and Astronomy, Rice University, USA)
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Workshop
iTHEMS Science Outreach Workshop 2023
June 16 (Fri) - 18 (Sun), 2023
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Schoolg-RIPS-Sendai 2023
June 19 (Mon) - August 8 (Tue), 2023
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Lecture
2nd QGG Intensive Lectures: Large gauge transformation and infrared regularity in the inflationary universe
June 19 (Mon) - 20 (Tue), 2023
Prof. Takahiro Tanaka (Professor, Division of Physics and Astronomy, Graduate School of Science, Kyoto University)
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Workshop6th Workshop on Virus Dynamics
July 4 (Tue) - 6 (Thu), 2023
Prof. Catherine Beauchemin (Deputy Program Director, iTHEMS)
Prof. Shingo Iwami (Professor, Graduate School of Science, Nagoya University) -
Seminar
A dynamical model for IRAS 00500+6713: the remant of a type Iax supernova SN1181 hosting a double degenerate merger product WD J005311
July 7 (Fri) at 14:00 - 15:15, 2023
Mr. Takatoshi Ko (Ph.D. Student, Research Center for the Early Universe (RESCEU), The University of Tokyo)
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ColloquiumThe eyes have it: Influenza virus infection beyond the respiratory tract
July 11 (Tue) at 14:00 - 15:30, 2023
Dr. Jessica Belser (Research Microbiologist, Influenza Division, US Centers for Disease Control and Prevention (CDC), USA)
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Lecture
Higher Algebra in Geometry
July 31 (Mon) - August 10 (Thu), 2023
Dr. Hiro Lee Tanaka (Assistant Professor, Department of Mathematics, Texas State University, USA)
Opportunities
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Call for RIKEN ECL Unit Leaders (Sechi Kato Program) – RIKEN Early Career Leaders Program (FY 2024)
Deadline: June 26, 2023
RIKEN offers junior Principal Investigator (PI) positions, RIKEN ECL Unit Leaders (ECL Unit Leaders), for exceptionally talented female researchers for a maximum of 5 years. The purpose of this program is to provide excellent young researchers with an opportunity to promote their own unique research independently as a laboratory head, to develop themselves as researchers with international leadership, and to create the next generation of science and technology fields. The ECL Unit Leaders are expected to ambitiously challenge their own unique research topics at the host research centers. This program is open to female researchers in natural and mathematical sciences and can include research areas bordering the humanities and social sciences. -Who was Sechi Kato? – Sechi Kato (1893-1989) was a pioneering female scientist who developed spectrometric analysis of organic materials. She was also the first female Chief Scientist of RIKEN.
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Call for RIKEN ECL Team Leaders (Sechi Kato Program) – RIKEN Early Career Leaders Program (FY 2024)
Deadline: June 19, 2023
RIKEN offers junior Principal Investigator (PI) positions, RIKEN ECL Team Leaders (ECL Team Leaders), for exceptionally talented female researchers for a maximum of 7 years. The ECL Team Leaders are expected to engage in creative and ambitious research in natural and mathematical sciences and can include research areas bordering the humanities and social sciences, by leading their own independent research teams. Proposals intended to resolve urgent issues that humankind faces today are also welcome (for example, the United Nations SDGs).
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Call for RIKEN ECL Unit Leaders – RIKEN Early Career Leaders Program (FY 2024)
Deadline: June 26, 2023
RIKEN offers junior Principal Investigator (PI) positions, RIKEN ECL Unit Leaders (ECL Unit Leaders), for exceptionally talented researchers for a maximum of 5 years. The purpose of this program is to provide excellent young researchers with an opportunity to promote their own unique research independently as a laboratory head, to develop themselves as researchers with international leadership, and to create the next generation of science and technology fields. The ECL Unit Leaders are expected to ambitiously challenge their own unique research topics at the host research centers.
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Call for RIKEN ECL Team Leaders – RIKEN Early Career Leaders Program (FY 2024)
Deadline: June 19, 2023
RIKEN offers junior Principal Investigator (PI) positions, RIKEN ECL Team Leaders (ECL Team Leaders), for exceptionally talented researchers for a maximum of 7 years. The ECL Team Leaders are expected to engage in creative and ambitious research in natural and mathematical sciences and can include research areas bordering the humanities and social sciences, by leading their own independent research teams. Proposals intended to resolve urgent issues that humankind faces today are also welcome (for example, the United Nations SDGs).
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Seeking a few Female Postdoctoral Researchers, Female Research Scientists or Female Senior Research Scientists (W23010)
Deadline: Open until filled
Female Postdoctoral Researcher, Female Research Scientist or Female Senior Research Scientist, a few positions. iTHEMS is seeking a few Female Postdoctoral Researcher(s), Female Research Scientist(s) or Female Senior Research Scientist(s) to conduct theoretical research in the fields of natural sciences, mathematical sciences, or humanities and social sciences. The scope of responsibilities will be commensurate with the applicant's career level. The applicants will be expected not only to pursue top-level research in their field but also to collaborate actively with an interdisciplinary group of researchers across fields such as mathematics, physics, chemistry, life sciences, engineering, computational sciences, information sciences, and humanity and social sciences, under the concept of iTHEMS. For more details, send an email to the contact address below.
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Seeking a few Postdoctoral Researchers (RIKEN-Berkeley Fellow associated with N3AS) (W22284)
Deadline: Open until filled
Postdoctoral Researcher (RIKEN-Berkeley Fellow associated with N3AS), a few positions. Theoretical works associated with neutrino physics, nucleosynthesis, dense matter and neutron stars, dark matter, astrophysical simulations, lattice QCD simulations and related fields. Successful applicants will work and spend the first three months at the RIKEN Wako campus, and the remainder of the years at the RIKEN Berkeley Center at the University of California, Berkeley on a long term business trip. The appointments of the RIKEN Berkeley Fellow are made through RIKEN iTHEMS.
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Seeking Postdoctoral Researcher, Research Scientist and Senior Research Scientist (W22219)
Deadline: Open until filled
Postdoctoral Researcher, Research Scientist and Senior Research Scientist, about 10 in total. Depending on experience, performance and ability, they are employed as postdoctoral researchers (3-year term), research scientists (5-year term) or senior research scientists (7-year term). This call is for researchers to work in iTHEMS in collaboration with one of the following laboratories participating in RIKEN Quantum (work concurrently with one of the following laboratories as needed), and to carry out research in quantum computational science and related fields. RIKEN Quantum aims to promote fundamental science based on quantum computational science, and the successful candidate will not only conduct top-level research on their own topic, but also contribute to building common ground in mathematics, physics, chemistry, life sciences, information sciences, computational science, humanities and social sciences through quantum computational science.
Latest News
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2023-06-01
Paper of the WeekWeek 1, June 2023
Title: Survival Probability of Unstable States in Coupled-Channels -- nonexponential decay of "threshold-cusp" Author: Wren A. Yamada, Osamu Morimatsu, Toru Sato, Koichi Yazaki arXiv: http://arxiv.org/abs/2305.11695v2 Title: Chiral fermion in the Hamiltonian lattice gauge theory Author: Tomoya Hayata, Katsumasa Nakayama, Arata Yamamoto arXiv: http://arxiv.org/abs/2305.18934v1 Title: QCD-Based Charge Symmetry Breaking Interaction and Okamoto-Nolen-Schiffer Anomaly Author: Hiroyuki Sagawa, Tomoya Naito, Xavier Roca-Maza, Tetsuo Hatsuda arXiv: http://arxiv.org/abs/2305.17481v1
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2023-06-01
Seminar Report
Quantum uncertainty of fields and its effect on entanglement generation in quantum particles by Mr. Yuki Sugiyama on May 31, 2023
The unification of gravity and quantum mechanics is one of the important problems. To elucidate the theory of quantum gravity, it is becoming more and more important to get any hint of the quantum nature of gravity. In particular, the quantum-gravity-induced-entanglement of masses (QGEM) scenario, which is expected to observe the quantum nature of non-relativistic gravity, has recently attracted great attention. In this talk, Sugiyama-san showed the effect of relativistic fields on entanglement generation based on quantum field theory. We also discussed the relationship between the entanglement generation and quantum uncertainty of the fields. Reported by Shigehiro Nagataki
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2023-05-31
Seminar Report
iTHEMS Theoretical Physics Seminar by Dr. Masaki Tezuka on May 30, 2023
On May 30, Dr. Masaki Tezuka gave a talk on Spectral correlations and scrambling dynamics in Sachdev-Ye-Kitaev(SYK) type models. He explained his recent studies on quantum chaotic features, quantum scrambling, and connections to holography and quantum error corrections in the SYK-type models. Reported by Yuta Sekino