News
129 news in 2024
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2024-12-16
Seminar Report
iTHEMS Theoretical Physics Seminar by Tingyu Zhang on June 25, 2024
In this seminar, Mr. Tingyu Zhang presented their work on spin transport phenomena at strongly-correlated interfaces. They study the spin tunneling in a repulsively interacting ultracold Fermi gas based on the conventional quasiparticle tunneling process. The change of the Fano factor microscopically evinces a crossover from the quasiparticle transport to magnon transport in itinerant fermionic systems. Reported by Yuta Sekino
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2024-12-16
Hot Topic
The second internal meeting of RIKEN Quantum on December 6, 2024
On Dec. 6 (Fri), the second internal meeting of RIKEN Quantum was held at Room 359, Main Research Building, RIKEN (Wako), attended by over 40 RIKEN Quantum members and related researchers. At this meeting, Yantao Wu, Himadri Pathak, and Xiaoyang Wang who have become RIKEN Quantum researchers this fall gave presentations on their recent research. In addition, 8 researchers from outside RIKEN who have become RIKEN visiting scientists in September to conduct collaborative research proposals also gave short talks to introduce themselves. They had a very lively discussion that will deepen understanding of their research. During the banquet following the meeting, participants deepened exchanges in a relaxed atmosphere and engaged in various conversations that will lead to the future development of RIKEN Quantum's activities.
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2024-12-12
Paper of the WeekWeek 3, December 2024
Title: Exploring $ Λ{\text-} $ and $ Ξ{\text -}$triton correlation functions in heavy-ion collisions Author: Faisal Etminan arXiv: http://arxiv.org/abs/2412.07295v1 Title: Dissipative parametric resonance in a modulated 1D Bose gas Author: Amaury Micheli, Scott Robertson arXiv: http://arxiv.org/abs/2412.07506v1 Title: Moving Protocol of Majorana Corner Modes in a Superconducting 2D Weyl Semimetal Heterostructure Author: Ching-Kai Chiu, Yueh-Ting Yao, Tay-Rong Chang, Guang Bian arXiv: http://arxiv.org/abs/2412.06150v1 Title: Tripling Fluctuations and Peaked Sound Speed in Fermionic Matter Author: Hiroyuki Tajima, Kei Iida, Toru Kojo, Haozhao Liang arXiv: http://arxiv.org/abs/2412.04971v1 Title: Evidence of a CP broken deconfined phase in 4D SU(2) Yang-Mills theory at $θ=π$ from imaginary $θ$ simulations Author: Mistuaki Hirasawa, Masazumi Honda, Akira Matsumoto, Jun Nishimura, Atis Yosprakob arXiv: http://arxiv.org/abs/2412.03683v1 Title: Winding number on 3D lattice Author: Okuto Morikawa, Hiroshi Suzuki arXiv: http://arxiv.org/abs/2412.03888v2
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2024-12-09
Seminar Report
Quantum Computation SG Seminar by Dorota Grabowska on December 6, 2024
The seminar speaker introduced the topic of Quantum Computations for Lattice Gauge Theories (LGT). Classical methods to solve LGTs are very advanced and allow researchers to connect the Standard Model of Particle Physics and its predictions to collider experiments. Some important phenomena arising in the Standard Model can not be explored with classical algorithms, and they may benefit from quantum computers. The seminar introduced the important aspects of research needed to understand how to define LGT in the Hamiltonian formulation. For example, how to define the Hamiltonian and its symmetries. Or how to choose the basis of the quantum operators on the lattice. Many interesting discussions followed the seminar. Reported by Enrico Rinaldi (Quantinuum / iTHEMS)
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2024-12-05
Paper of the WeekWeek 2, December 2024
Title: A deep neural network approach to solve the Dirac equation Author: Chuanxin Wang, Tomoya Naito, Jian Li, Haozhao Liang arXiv: http://arxiv.org/abs/2412.03090v1 Title: Diffusion models learn distributions generated by complex Langevin dynamics Author: Diaa E. Habibi, Gert Aarts, Lingxiao Wang, Kai Zhou arXiv: http://arxiv.org/abs/2412.01919v1 Title: Relative simplicity of the universal coverings of transformation groups and Tsuboi's metric Author: Morimichi Kawasaki, Mitsuaki Kimura, Hiroki Kodama, Yoshifumi Matsuda, Takahiro Matsushita, Ryuma Orita arXiv: http://arxiv.org/abs/2412.00839v1 Title: Topological electronic structure and electronic nematicity in candidate kagome superconductors, ATi$_{3}$Bi$_{5}$ (A = Rb, Cs) Author: Yong Hu, Congcong Le, Xianxin Wu, Ming Shi Journal Reference: Supercond. Sci. Technol. 37, 123004 (2024) doi: https://doi.org/10.1088/1361-6668/ad8bf9 arXiv: http://arxiv.org/abs/2410.21678v1
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2024-12-04
Researches & Researchers
Exploring Quantum Gravity Theories and Contributing to the Future - Yasunori Nomura
Professor Yasunori Nomura, a theoretical physicist at the University of California, Berkeley, has been staying at RIKEN iTHEMS for about two months each summer since last year, conducting research. Despite his busy schedule, Nomura is also actively engaged in outreach activities. We spoke with him about his life journey and thoughts on his research activities. Please see the full article via the related link.
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2024-12-04
Researches & Researchers
Expanding New Medical Possibilities From Microbial Research - Daiki Kumakura
Daiki Kumakura, is a Ph.D. student at the Graduate School of Life Science, Hokkaido University. He is also a Junior Research Associate (JRA) at RIKEN iTHEMS, where he conducts his research. We asked him about the advantages of conducting research at iTHEMS as a student and his aspirations for the future. Please see the full article via the related link.
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2024-12-04
Person of the Week
Self-introduction: Qianteng Zhu
I am a Ph.D. student from Shanghai Jiao Tong University, China and I joined iTHEMS in Dec 2024 as an IPA student. I am interested in Lattice QCD and Machine Learning. I am studying methods to figure out hadron interactions from Lattice QCD. I am also excited to apply machine learning to physics problems. Please feel free to discuss with me.
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2024-11-28
Paper of the WeekWeek 5, November 2024
Title: Note on a BCS analogy of Majorana neutrinos Author: Kazuo Fujikawa, Anca Tureanu arXiv: http://arxiv.org/abs/2411.15704v1 Title: Learning Hadron Emitting Sources with Deep Neural Networks Author: Lingxiao Wang, Jiaxing Zhao arXiv: http://arxiv.org/abs/2411.16343v1
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2024-11-26
Hot Topic
Farewell message from Shingo Gibo
Our colleague Shingo Gibo will move on to a new career as senior researcher at Institute for Basic Science (IBS), South Korea as of December 1, 2024. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Shingo Gibo: I joined iTHEMS in September 2018 and spent six years as a postdoctoral researcher at iTHEMS. During this time, I have theoretically studied biological oscillations with Kurosawa-san. Additionally, I collaborated on interdisciplinary research on waveforms in circadian clocks with physicists, Hatsuda-san and Kunihiro-san. I would like to thank all the members for the valuable discussions and support. I have learned a lot and truly enjoyed my time at iTHEMS. From December, I will be moving to Institute for Basic Science (IBS) in South Korea as a senior researcher. Thank you for the great six years and see you again!
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2024-11-21
Paper of the WeekWeek 4, November 2024
Title: Updates on the density of states method in finite temperature symplectic gauge theories Author: David Mason, Ed Bennett, Biagio Lucini, Maurizio Piai, Enrico Rinaldi, Davide Vadacchino, Fabian Zierler arXiv: http://arxiv.org/abs/2411.13101v1 Title: A universal framework for the quantum simulation of Yang-Mills theory Author: Jad C. Halimeh, Masanori Hanada, Shunji Matsuura, Franco Nori, Enrico Rinaldi, Andreas Schäfer arXiv: http://arxiv.org/abs/2411.13161v1 Title: Overtones and Nonlinearities in Binary Black Hole Ringdowns Author: Matthew Giesler, Sizheng Ma, Keefe Mitman, Naritaka Oshita, Saul A. Teukolsky, Michael Boyle, Nils Deppe, Lawrence E. Kidder, Jordan Moxon, Kyle C. Nelli, Harald P. Pfeiffer, Mark A. Scheel, William Throwe, Nils L. Vu arXiv: http://arxiv.org/abs/2411.11269v1 Title: NinjaSat monitoring of Type-I X-ray bursts from the clocked burster SRGA J144459.2$-$604207 Author: Tomoshi Takeda, Toru Tamagawa, Teruaki Enoto, Takao Kitaguchi, Yo Kato, Tatehiro Mihara, Wataru Iwakiri, Masaki Numazawa, Naoyuki Ota, Sota Watanabe, Arata Jujo, Amira Aoyama, Satoko Iwata, Takuya Takahashi, Kaede Yamasaki, Chin-Ping Hu, Hiromitsu Takahashi, Akira Dohi, Nobuya Nishimura, Ryosuke Hirai, Yuto Yoshida, Hiroki Sato, Syoki Hayashi, Yuanhui Zhou, Keisuke Uchiyama, Hirokazu Odaka, Tsubasa Tamba, Kentaro Taniguchi arXiv: http://arxiv.org/abs/2411.10992v1 Title: Evidence of non-Solar elemental composition in the clocked bursts from SRGA J144459.2$-$604207 Author: Akira Dohi, Nobuya Nishimura, Ryosuke Hirai, Tomoshi Takeda, Wataru Iwatari, Toru Tamagawa, Amira Aoyama, Teruaki Enoto, Satoko Iwata, Yo Kato, Takao Kitaguchi, Tatehiro Mhira, Naoyuki Ota, Takuya Takahashi, Sota Watanabe, Kaede Yamasaki arXiv: http://arxiv.org/abs/2411.10993v1 Title: Optical response of edge modes in time-reversal symmetric topological superconductors Author: Hirokazu Kobayashi, Han Bi, James Jun He, Seishiro Ono arXiv: http://arxiv.org/abs/2411.09985v1 Title: Photon polarization tensor at finite temperature and density in a magnetic field Author: Kenji Fukushima, Yoshimasa Hidaka, Tomoya Uji arXiv: http://arxiv.org/abs/2411.09994v1 Title: On the possible contributions of two nearby blazars to the NGC 4151 neutrino hotspot Author: Anastasiia Omeliukh, Samuel Barnier, Yoshiyuki Inoue arXiv: http://arxiv.org/abs/2411.09332v1 Title: A Krylov space approach to Singular Value Decomposition in non-Hermitian systems Author: Pratik Nandy, Tanay Pathak, Zhuo-Yu Xian, Johanna Erdmenger arXiv: http://arxiv.org/abs/2411.09309v1 Title: Chemistry Beyond Exact Solutions on a Quantum-Centric Supercomputer Author: Javier Robledo-Moreno, Mario Motta, Holger Haas, Ali Javadi-Abhari, Petar Jurcevic, William Kirby, Simon Martiel, Kunal Sharma, Sandeep Sharma, Tomonori Shirakawa, Iskandar Sitdikov, Rong-Yang Sun, Kevin J. Sung, Maika Takita, Minh C. Tran, Seiji Yunoki, Antonio Mezzacapo arXiv: http://arxiv.org/abs/2405.05068v2
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2024-11-18
Researches & Researchers
To Continue Being a Researcher - Misako Tatsuuma
What processes lead to the formation of planets? — Research Scientist Misako Tatsuuma aims to theoretically answer this question. Describing herself as "indecisive at times but fundamentally a perfectionist," Tatsuuma adds, "I consider strategies carefully before acting." This approach applies not only to her research but also to her private life. What are these strategies? Please see the full article via the related link.
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2024-11-18
Researches & Researchers
Connecting People Through Science - Tomoya Nagai
When we think of mathematics, the image of a large blackboard covered with various equations often comes to mind. Spirited conversations in front of such blackboards frequently appear in videos and photos capturing the research atmosphere of the Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS). How are these lively discussion spaces created? We spoke with Tomoya Nagai, the Coordinator and Director of the Program Director's Office, whose work involves creating a conducive research environment. Please see the full article via the related link.
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2024-11-18
Person of the Week
Self-introduction: Daeho Park
I interested in ameliorating methodologies employed hadron physics, especially quark model and lattice QCD, to test various ideas accurately and reliably. Then, equipped with correct characteristics of hadrons, I will trace back to QCD to investigate origin of diverse existence of hadrons. I like to combine different things in different ways, so if you have some geek-looking idea, please let me know!
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2024-11-18
Researches & Researchers
Toward Developing Unifying Theories of Biology, Mathematics, and Society - Ryosuke Iritani
Living organisms are immensely complex. Their complexity renders it challenging to understand organisms’ behaviors and evolutionary processes. Despite advances in genomic analysis starting to reveal more biological details, many mysteries remain unsolved. Mathematical biology aims to unravel these mysteries using mathematics. We spoke with Senior Researcher Ryosuke Iritani, who is conducting research in this field, about why he chose this field and found it so fascinating. Please see the full article via the related link.
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2024-11-14
Paper of the WeekWeek 3, November 2024
Title: Conditional lower bounds on the distribution of central values: the case of modular forms Author: Didier Lesesvre, Ade Irma Suriajaya arXiv: http://arxiv.org/abs/2411.06218v1 Title: Schwinger-Keldysh effective action for hydrodynamics with approximate symmetries Author: Masaru Hongo, Noriyuki Sogabe, Mikhail A. Stephanov, Ho-Ung Yee arXiv: http://arxiv.org/abs/2411.08016v1 Title: A note on the Erdős conjecture about square packing Author: Junnosuke Koizumi, Takahiro Ueoro arXiv: http://arxiv.org/abs/2411.07274v1 Title: Selection rules of topological solitons from non-invertible symmetries in axion electrodynamics Author: Yoshimasa Hidaka, Muneto Nitta, Ryo Yokokura arXiv: http://arxiv.org/abs/2411.05434v1 Title: Scaling law for membrane lifetime Author: Osamu Fukushima, Tomohiro Shigemura, Kentaroh Yoshida arXiv: http://arxiv.org/abs/2411.04754v1 Title: Convergence study of multi-field singular value decomposition for turbulence fields Author: Go Yatomi, Motoki Nakata arXiv: http://arxiv.org/abs/2411.03739v2
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2024-11-12
Hot Topic
Farewell message from Yaokun Lei
Our colleague Yaokun Lei will move on to a new career as associate research fellow at Shenzhen Bay Laboratory, China as of November. 11, 2024. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Yaokun Lei: I joined iTHEMS last August. Although it’s a short time, it has been a truly enriching experience to be a part of iTHEMS. The support and collaborative spirit here have been invaluable, and I am especially grateful for the guidance and help from Hatsuda-san and Sugita-san, whose encouragement has greatly impacted this journey. I am thankful for the friendships and knowledge shared, and as I step forward, I carry with me not only the insights from my research but also the inspiration from our exchanges. I hope our paths cross again in future collaborations. Thank you all for everything, and wishing you continued success and discoveries.
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2024-11-07
Paper of the WeekWeek 2, November 2024
Title: Impact of the relativistic Cowling approximation on shear and interface modes of neutron stars Author: C. J. Krüger, H. Sotani arXiv: http://arxiv.org/abs/2411.03940v1 Title: Phase transition on superfluid vortices in Higgs-Confinement crossover Author: Tomoya Hayata, Yoshimasa Hidaka, Dan Kondo arXiv: http://arxiv.org/abs/2411.03676v1 Title: The stable uniqueness theorem for unitary tensor category equivariant KK-theory Author: Sergio Girón Pacheco, Kan Kitamura, Robert Neagu arXiv: http://arxiv.org/abs/2410.23935v1
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2024-10-31
Paper of the WeekWeek 5, October 2024
Title: Quarkyonic matter pieces together the hyperon puzzle Author: Yuki Fujimoto, Toru Kojo, Larry McLerran arXiv: http://arxiv.org/abs/2410.22758v1 Title: Nucleon-charmonium interactions from lattice QCD Author: Yan Lyu, Takumi Doi, Tetsuo Hatsuda, Takuya Sugiura arXiv: http://arxiv.org/abs/2410.22755v1 Title: Exploring the $ φ{\text -}α$ interaction via femtoscopic study Author: Faisal Etminan arXiv: http://arxiv.org/abs/2410.22756v1 Title: Dispersion kinks from electronic correlations in an unconventional iron-based superconductor Author: Ming-Hua Chang, Steffen Backes, Donghui Lu, Nicolas Gauthier, Makoto Hashimoto, Guan-Yu Chen, Hai-Hu Wen, Sung-Kwan Mo, Roser Valenti, Heike Pfau arXiv: http://arxiv.org/abs/2410.23044v1 Title: Probing the goldstino excitation via tunneling current noise in a Bose-Fermi mixture Author: Tingyu Zhang arXiv: http://arxiv.org/abs/2410.20794v1 Title: On learning higher-order cumulants in diffusion models Author: Gert Aarts, Diaa E. Habibi, Lingxiao Wang, Kai Zhou arXiv: http://arxiv.org/abs/2410.21212v1 Title: Diffusion models for lattice gauge field simulations Author: Qianteng Zhu, Gert Aarts, Wei Wang, Kai Zhou, Lingxiao Wang arXiv: http://arxiv.org/abs/2410.19602v1 Title: Lattice study of RG fixed point based on gradient flow in $3$D $O(N)$ sigma model Author: Okuto Morikawa, Mizuki Tanaka, Masakiyo Kitazawa, Hiroshi Suzuki arXiv: http://arxiv.org/abs/2410.19425v1 Title: Physics-informed Neural Networks for Functional Differential Equations: Cylindrical Approximation and Its Convergence Guarantees Author: Taiki Miyagawa, Takeru Yokota arXiv: http://arxiv.org/abs/2410.18153v1 Title: Threats to cycad biocultural heritage in the Amami Islands, Japan Author: Joshua D. Englehardt, Michael D. Carrasco, José Said Gutiérrez-Ortega, Benjamin E. Deloso, Nobuyuki Matsubara Journal Reference: Plant Species Biology doi: https://doi.org/10.1111/1442-1984.12494
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2024-10-24
Paper of the WeekWeek 4, October 2024
Title: Ceratozamia chinantlensis (Zamiaceae): A New Cycad Species from La Chinantla, Oaxaca, Mexico Author: Miguel Angel Pérez-Farrera, Steven M. Ramirez-Oviedo, Mauricio Gerónimo Martínez-Martínez, Gaspar Moreno Mendez, Ana Guadalupe Rocha Loredo, José Said Gutiérrez-Ortega Journal Reference: Taxonomy 2024, 4(4), 733-747 doi: https://doi.org/10.3390/taxonomy4040039 Title: Ceratozamia guatemalensis (Zamiaceae): A new cycad species from Mesoamerica Author: Miguel Ángel Pérez-Farrera, Pedro Díaz-Jiménez, Maura L. Quezada, Andrea Marroquín-Tintí, Héctor M. Delgado-Montejo, Sandy A. Mendoza-Montejo, José Said Gutiérrez-Ortega Journal Reference: Phytotaxa 668 (1): 63-80 (2024) doi: https://doi.org/10.11646/phytotaxa.668.1.4 Title: Ceratozamia alba (Zamiaceae): A new cycad species from the Selva El Ocote Biosphere Reserve in Chiapas, Mexico Author: Miguel Ángel Pérez-Farrera, Mauricio G. Martínez-Martínez, Gaspar Moreno-Méndez, Andrew P. Vovides, José Said Gutiérrez-Ortega Journal Reference: Phytotaxa 666 (4): 257-276 (2024) doi: https://doi.org/10.11646/phytotaxa.666.4.2 Title: Multi wavefunction overlap and multi entropy for topological ground states in (2+1) dimensions Author: Bowei Liu, Junjia Zhang, Shuhei Ohyama, Yuya Kusuki, Shinsei Ryu arXiv: http://arxiv.org/abs/2410.08284v1
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2024-10-23
Seminar Report
iTHEMS Biology Seminar by Hirokazu Fukuda on October 17, 2024
On October 17, Dr Hirokazu Fukuda delivered a thought-provoking presentation titled “Digital Twinning of Plant Internal Clocks for Robotics and Virtual Reality Enhancements in Agriculture.” In Japan, the agricultural workforce has decreased by more than 30% over the past decade, creating a growing demand for technological innovations like robotics and AI to support the industry. Dr Fukuda shared his theoretical research, which focuses on understanding so-called, biological clocks that regulate our physiological processes. He has applied this knowledge to operate plant factories, successfully cultivating crops such as lettuce. He emphasized the importance of real-time 3D simulations in future "AI plant factories," where robots will play a central role based on data gathered from sensors within the facility. During his presentation, Dr Fukuda highlighted the role of mathematical research, especially in developing predictive models for plant growth. The seminar, held via Zoom, attracted more than 30 participants and sparked an active and engaging discussion. Thanks Fukuda san for great presentation!! Reported by Gen Kurosawa
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2024-10-23
Researches & Researchers
New Perspectives from the Intersection of Mathematics and Physics - Yuto Moriwaki
When people think of research in quantum field theory, most imagine physicists. However, Special Postdoctoral Researcher Yuto Moriwaki is a mathematician. In this interview, we asked Moriwaki about the allure and challenges of working across the fields of mathematics and physics. Please see the full article via the related link.
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2024-10-22
Seminar Report
Workshop: The 5th "Medicine and Mathematics" Workshop on September 29, 2024
The 5th “Medicine and Math” workshop took place on September 29th (Sun.) and 30th (Mon.), 2024, at RIKEN Integrated Innovation Building (IIB) in a hybrid format. This workshop series, which started at Kyoto University in 2019 and continued online in 2020, at Kyoto University in a hybrid format in 2022, and at Tohoku University in a hybrid format in 2023, aims to establish a new academic field that addresses questions and hypotheses in the field of clinical medicine with the aid of precise measurement, quantitative analyses, and mathematical modeling, by fusion of clinical science, mathematics, and physics. This year, the workshop was organized by Akihisa Yamamoto and Tetsuo Hatsuda (RIKEN iTHEMS), Motomu Tanaka (Heidelberg University, Kyoto University), Hiroshi Suito (Tohoku University, RIKEN iTHEMS), Eiryo Kawakami (RIKEN R-IH, Chiba University) and Takashi Sakajo (Kyoto University, RIKEN iTHEMS). It was co-hosted by RIKEN iTHEMS, Center for Integrative Medicine and Physics (CiMPhy, Kyoto University), Mathematical Science Center for Co-creative Society (MathCCS, Tohoku University), and Center for Science Adventure and Collaborative Research Advancement (SACRA, Kyoto University). The workshop had approximately 50 participants onsite and 50 participants online each day. The event featured 20 invited speakers and 12 poster presentations covering various fields such as cancer, pulmonology, ophthalmology, dentistry, primordial germ cells, cell dynamics, data science, and deep learning. The presentations included interdisciplinary studies and led to fruitful discussions among participants from different professional fields. Each day of the workshop began with welcoming remarks from Kohei Miyazono (Executive Director, RIKEN), Motoko Kotani (Executive Vice President, Tohoku University) on Day 1, and Nagahiro Minato (President, Kyoto University) on Day 2. Reported by Akihisa Yamamoto
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2024-10-22
Press Release
Discovery of a Sustained Magnetic Flow in Ultracold Atomic Gases
An international research group, including Yuta Sekino (Postdoctoral Researcher, iTHEMS / Postdoctoral Researcher, Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team) has discovered a mechanism that generates a long-lasting magnetic flow using ultracold atomic gases. This research result is expected to contribute to the realization of quantum simulators, which are essential for the development of highly efficient next-generation magnetic memory. For further details, please refer to the related link.
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2024-10-17
Paper of the WeekWeek 3, October 2024
Title: Ab initio study on heavy-fermion behavior in LiV$_2$O$_4$: Role of Hund's coupling and stability Author: Steffen Backes, Yusuke Nomura, Ryotaro Arita, Hiroshi Shinaoka arXiv: http://arxiv.org/abs/2410.08515v1
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2024-10-17
Press Release
Creation of the Quantum Universe and Precise Calculation of the Wave Function of the Universe
In modern cosmology, the idea that the universe was created from nothing through quantum effects has been a topic of active research. However, a long-standing debate has persisted regarding which of two prominent hypotheses—the no-boundary proposal or the tunneling proposal—is correct. A research team, including Hiroki Matsui (Postdoctoral fellow, Yukawa Institute for Theoretical Physics), Kazumasa Okabayashi (Postdoctoral fellow, Yukawa Institute for Theoretical Physics), Masazumi Honda (Senior Research Scientist, RIKEN), and Takahiro Terada (Research Assistant Professor, Nagoya University), has made significant progress in this debate by calculating the wave function of the universe from first principles, without the need for arbitrary assumptions about either proposal. Previous analyses left mathematical ambiguities unresolved, but this team eliminated those ambiguities using a method called resurgence theory. Their calculations rigorously demonstrated, under certain assumptions, that the wave function of the universe aligns with predictions from the tunneling proposal, not the no-boundary proposal. This result is a giant step forward in resolving the longstanding debate between these two hypotheses. For more details, please refer to the Kyoto University press release via the related links.
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2024-10-16
Hot TopicRIKEN Quantum Workshop on “Quantum-Like Modeling in Cognitive & Social Sciences" on October 11, 2024
On Oct. 11 (Fri), RIKEN Quantum Workshop on “Quantum-Like Modeling in Cognitive & Social Sciences” was held at Room 359, Main Research Building, RIKEN (Wako). The workshop was hosted by RIKEN Quantum and had 30 participants from a variety of fields, including cognitive and social sciences as well as life sciences, mathematics, and physics. This was the first workshop at RIKEN to discuss “Quantum-Like Modeling” for various phenomena in cognitive and social sciences. “Quantum-Like Modeling” suggests that using quantum probability calculus and its applications could be useful to rationalize cognitive and social phenomena as open quantum systems and expand previous understandings, obtained through simple linear algebra, by applying quantum formalizations. After Atsushi Iriki, one of the organizers, explained the purpose of the workshop, there were four invited talks. Andrei Khrennikov gave a comprehensive talk on applications of the methodology and formalism of quantum theory outside of physics, in cognition, psychology, decision making, social and political sciences, economics and finance, genetics and evolutionary biology. Masanao Ozawa gave an introduction to his proposed quantum instrument theory, which unifies quantum measurement and quantum cognition through quantum simulation. Haruki Emori talked about applications of quantum computers to cognitive sciences based on the quantum instrument theory. Finally, Miho Fuyama introduced her empirical research on subjective experiences and superposition states of quantum probability theory in narrative reading. These invited talks were followed by a general discussion and networking mixer, which deepened understanding of “Quantum-Like Modeling” in cognitive and social sciences from various perspectives and promoted new networking among the participants.
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2024-10-11
Person of the Week
Self-introduction: Yuuka Kanakubo
Hi, I’m Yuuka. I did my PhD at Sophia University in Japan, and moved to Finland and spent 2 years there as a postdoc at the University of Jyväskylä. Now, I have returned to Japan as a RIKEN-Berkeley fellow at iTHEMS. Since my PhD, I have been working on the development of Monte-Carlo event generators for relativistic nuclear collisions. I am generally interested in a collision of large and heavy nuclei, such as lead ions or gold ions, with a large mass number. The typical collision energy reaches up to a few TeV per nucleon pair at their centre of mass. With these experimental setups, we can generate an extremely hot soup of quarks and gluons, known as “quark-gluon plasma”. Relativistic nuclear collisions are dynamical processes with several different stages. I describe the collision process in full 3D and as dynamically as possible by sequentially applying different theoretical descriptions to each stage. For instance, I describe the production of quarks and gluons in the initial impact of colliding nuclei using perturbative QCD, the evolution of quark-gluon plasma with relativistic relativistic hydrodynamics combined with lattice QCD, and the interaction of hadrons in the final state using hadronic transport. I believe iTHEMS is an excellent research environment in this aspect as the study requires diverse knowledge in, for example, nuclear structure, perturbative and non-perturbative QCD, thermodynamics, methodology in Monte-Carlo simulations of many-body systems etc. I am excited to discuss with people from various fields and hope to find new solutions or new ideas!
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2024-10-10
Paper of the WeekWeek 2, October 2024
Title: Building Hadron Potentials from Lattice QCD with Deep Neural Networks Author: Lingxiao Wang, Takumi Doi, Tetsuo Hatsuda, Yan Lyu arXiv: http://arxiv.org/abs/2410.03082v1 Title: Enhanced quantitation of pathological ɑ-synuclein in patient biospecimens by RT-QuIC seed amplification assays Author: Srivastava, A, Q Wang, CD Orrù, M Fernandez, Y Compta, B Ghetti, G Zanusso, WQ Zou, B Caughey, and CAA Beauchemin Journal Reference: PLOS Pathog., 20(9):e1012554 doi: https://doi.org/10.1371/journal.ppat.1012554 Title: Consistency of operator product expansions of Boundary 2d CFT and Swiss-cheese operad Author: Yuto Moriwaki arXiv: http://arxiv.org/abs/2410.02648v1 Title: Gravitational wave asteroseismology of accreting neutron stars in a steady state Author: Hajime Sotani, Akira Dohi arXiv: http://arxiv.org/abs/2410.01552v1 Title: The Disk Wind Contribution to the Gamma-Ray emission from the nearby Seyfert Galaxy GRS 1734-292 Author: Nobuyuki Sakai, Tomoya Yamada, Yoshiyuki Inoue, Ellis R. Owen, Tomonari Michiyama, Ryota Tomaru, Yasushi Fukazawa arXiv: http://arxiv.org/abs/2410.02263v1
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2024-10-09
Hot Topic
Report on the induction ceremony of American Academy of Arts and Sciences
Tetsuo Hatsuda attended the induction ceremony of the American Academy of Arts and Sciences [1], held in Cambridge, Massachusetts, from September 29 to October 1, 2024, as a newly elected International Honorary Member (HIM). This year, 250 new members were inducted, including 25 HIMs [2], across various fields such as Mathematical and Physical Sciences, Biological Sciences, Social and Behavioral Sciences, Humanities and Arts, and Leadership, Policy and Communications. The ceremony began with a gathering of new members at the House of the Academy [3]. The formal induction took place on September 30 at Sanders Theatre, Memorial Hall at Harvard University [4], starting at 3 p.m. During the ceremony, each inductee was called to the stage individually to sign the Academy members’ book. In addition to the induction ceremony, there were receptions on September 29 and 30. The event concluded with a special lecture titled "Memory is about your future – what we think we become," delivered by André Fenton. In the photograph, Tetsuo Hatsuda is seen on the left signing the Academy's book. On the right, he is pictured conversing with Bonnie Fleming [5], a fellow inductee in physics and a neutrino experimentalist from Fermilab. Throughout the meeting, Tetsuo enjoyed engaging in conversations not only with fellow physicists but also with researchers from the social sciences and humanities.
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2024-10-08
Hot Topic
Presentation of iTHEMS outreach at NuFACT conference
iTHEMS is a fantastic environment in which we conduct interdisciplinary research daily. Along with our research activity, a variety of outreach activities have been conducted so far. Tomoya Nagai (Coordinator, iTHEMS) presented this special environment and its outreach activity at the NuFACT 2024 conference. At the conference, a session for Inclusion, Diversity, Equity, Education, and Outreach (IDEEO) was composed. The session itself was organized so that we could visualize diversity in terms of speaker's and convener's properties. It provided us with a good opportunity to know IDEEO-related activities all over the world, which can be a chance to recognize and reconsider the issue around to achieve "good environments for everyone". One special example of the iTHEMS outreach was the "Journalist in residence" program. The uniqueness of the activity caught significant attention from the participants of the conference. Also, "Mathematics Connecting to the World: One S&T poster for Every Household" seemed to be intriguing. Although we had only a limited time for this exhibition and discussion, Nagai's attendance brought the conference a fresh view of the outreach activity as well as the achievements of the interdisciplinary and diverse environments. iTHEMS can be so influential to our community in multiple contexts!
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2024-10-07
Person of the Week
Self-introduction: Gabriele Di Ubaldo
I am broadly interested in understanding quantum gravity as an emergent phenomenon. This is the case in the AdS/CFT correspondence where a d+1-dimensional theory of quantum gravity (usually a string theory) emerges from the collective dynamics of a d-dimensional Conformal Field Theory (CFT) with many degrees of freedom. I believe this is a beautiful example of Anderson's principle "More is different", where many-body quantum systems (the CFT) can exhibit striking and unexpected collective behaviour (Gravity). I am particularly interested in the role of quantum chaos and thermalization in the correspondence between CFT and black hole physics and how to explain and derive gravitational phenomena, such as wormholes, using CFT and the tools of the conformal bootstrap. More broadly, I am interested in many-body quantum systems, disordered systems, classical and quantum chaos, and diverse topics in math, such as random matrix theory, analytic number theory (modular forms), topological recursion, and three-manifold geometry. If you are working on any of these topics or are simply interested, I'll be happy to talk physics! Previously, I obtained my PhD at the Institut de Physique Theorique in Paris, CEA Saclay, working with Eric Perlmutter, and my master's degree at Ecole Normale Superieure in Paris. Looking forward to my time at RIKEN and UC Berkeley!
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2024-10-07
Seminar Report
NCTS-iTHEMS Joint Workshop on Matters to Spacetime: Symmetries and Geometry on August 26, 2024
The 1st NCTS-iTHEMS Joint Workshop was held from August 26th to August 29th, 2024, at the National Center for Theoretical Sciences (NCTS), National Taiwan University, Taipei, Taiwan. The event was co-hosted by NCTS and RIKEN's Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) program. A total of around 50 participants from Japan and from Taiwan attended the workshop. The workshop aimed to foster collaboration in the fields of condensed matter physics and quantum gravity, bringing together experts to share the latest research developments, explore interdisciplinary connections, and identify opportunities for joint projects. It marked the launch of an annual series of joint workshops between NCTS and iTHEMS, with alternating hosts. The program alternated in each session on one day between condensed matter physics and quantum gravity topics to promote interdisciplinary collaboration. This alternating format encouraged researchers to engage with ideas outside their primary field, stimulating innovative approaches and broadening the scope for joint research. The four-day workshop included 23 talks, covering a range of topics such as topological superconductors, twisted bilayer graphene, quantum holography, and string theory. Some afternoon sessions were dedicated to informal discussions, promoting interdisciplinary exchange between participants. Researchers had the opportunity to explore potential collaborations, exchange ideas on shared problems, and identify future research directions. The 1st NCTS-iTHEMS Joint Workshop fostered collaboration between condensed matter physicists and quantum gravity theorists. By alternating topics each day, the workshop created a dynamic environment where researchers from both fields could engage with each other’s ideas, leading to cross-disciplinary innovations and future collaborative efforts. The next iTHEMS- NCTS Joint Workshop will be held in RIKEN Wako campus in 2025, with iTHEMS serving as the host. The long-term objective is to continue this tradition of interdisciplinary exchange, ensuring the involvement of a diverse set of researchers and further strengthening the research connections between NCTS and iTHEMS. Reported by Ching-Kai Chiu
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2024-10-03
Paper of the WeekWeek 1, October 2024
Title: The density of states method for symplectic gauge theories at finite temperature Author: Ed Bennett, Biagio Lucini, David Mason, Maurizio Piai, Enrico Rinaldi, Davide Vadacchino arXiv: http://arxiv.org/abs/2409.19426v1 Title: Floquet evolution of the q-deformed \texorpdfstring{SU(3)${}_1$}{SU(3)1} Yang-Mills theory on a two-leg ladder Author: Tomoya Hayata, Yoshimasa Hidaka arXiv: http://arxiv.org/abs/2409.20263v1 Title: Preponderant Orbital Polarization in Relativistic Magnetovortical Matter Author: Kenji Fukushima, Koichi Hattori, Kazuya Mameda arXiv: http://arxiv.org/abs/2409.18652v1 Title: Femtoscopic study of the $ Ωα$ interaction in heavy-ion collisions Author: Faisal Etminan arXiv: http://arxiv.org/abs/2409.19705v1
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2024-10-03
Person of the Week
Self-introduction: Xiaoyang Wang
My main research interests focus on the cross of quantum computation and many-body systems, in particular, the near-term quantum algorithm for lattice field theory, spin models, and combinatorial optimization problems. We intend to demonstrate the advantage of quantum computers in real-world applications on currently available quantum devices.
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2024-10-02
Hot Topic
RIKEN - LBNL Workshop on Quantum Information Science on September 3-6, 2024
On Sep. 3 (Tue) - 6 (Fri), RIKEN - LBNL Workshop on Quantum Information Science was held at Lawrence Berkeley National Laboratory (LBNL). The workshop was co-hosted by RIKEN-iTHEMS and LBNL and sponsored by RIKEN Quantum, with 32 and 40 participants from Japan and USA, respectively. This was the second in-person workshop by RIKEN and LBNL on quantum information science since the first was held at LBNL in January 2019 before the Covid-19 pandemic. The purpose of the workshop was to bring together researchers worldwide to discuss and collaborate on the latest developments in quantum technologies and quantum computing including algorithms, hybrid quantum-classical computing, error mitigation, and applications in physics and chemistry. There were 36 talks and 4 poster presentations during the entire four days. In the afternoons of the second and third days, in addition to tours of LBNL's Advanced Quantum Testbed (AQT) and National Energy Research Scientific Computing Center (NERSC) facilities, special sessions delved into discussions on several focus areas and provided networking opportunities for future collaborations.
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2024-09-27
Hot Topic
Farewell message from Eiji Inoue
Our colleague Eiji Inoue will move on to a new career as an assistant professor at Kyoto University as of Oct. 1, 2024. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Eiji Inoue: I spent three and a half years in iTHEMS as an SPDR on math. I would like to thank the program director and assistants for their mindful support over these three and a half years. I also wish to thank iTHEMS members for discussion on many occasions. These years I spent in iTHEMS were invaluable for me. Among all, the best experience for me was that I could gradually get a feeling on "physics in the real world" not only mathematical structure of physics, from the choice of words physicists use in daily discussion. In these casual discussions, I could also try if my understanding of physics are correct. I also enjoyed playing quantum computers. I think it was impossible to experience without this tolerant environment of iTHEMS; indeed, it just started from a casual conversation with the director. It was the first time I experienced quantum phenomena, especially quantum entanglement, in the real world where I exist. This may sound a little strange, but I feel like I haven't had that feeling of interest in how the real world works in a long time. While I was going through these experiences like a newborn child, as a mathematician, I could finally achieve my original project on Perelman entropy in the last half year during my visits to Cambridge, Montreal and Aarhus. There are still many thigs to do, but this is certainly the foundation of this new theory. One regret is that I could not finish writing a paper on this result while enrolled at iTHEMS. I'll be an assistant professor at Kyoto University (Department of Math) from October. I welcome people from iTHEMS to come to Kyoto and discuss. I will also ask iTHEMS for help. See you again!
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2024-09-26
Paper of the WeekWeek 5, September 2024
Title: Exactly solvable stochastic spectator Author: Masazumi Honda, Ryusuke Jinno, Koki Tokeshi arXiv: http://arxiv.org/abs/2409.16272v1 Title: The average number of Goldbach representations over multiples of $q$ Author: Karin Ikeda, Ade Irma Suriajaya arXiv: http://arxiv.org/abs/2405.04315v3 Title: Exotic Dehn twists and homotopy coherent group actions Author: Sungkyung Kang, JungHwan Park, Masaki Taniguchi arXiv: http://arxiv.org/abs/2409.11806v1
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2024-09-24
Hot Topic
Farewell message from Kazuki Kannaka
Our colleague Kazuki Kannaka will move on to a new career as an assistant professor at Kanazawa University as of Oct. 1, 2024. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Kazuki Kannaka: At iTHEMS, thanks to the support from Hatsuda-san, Tada-san, Tsuboi-sensei, and all the assistants, I was able to focus on my research in a wonderful environment. During this period, I made several discoveries that were interesting at least to me. Also, discussing with researchers from other fields at iTHEMS was exciting. I am especially grateful to Namba-san and Iritani-san for providing the opportunity for such discussions. I look forward to continuing our research exchanges. Thank you!
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2024-09-24
Award
Okuto Morikawa received the "19th Seitaro Nakamura Prize"
Our colleague Okuto Morikawa (Special Postdoctoral Researcher, iTHEMS) has received the "19th Seitaro Nakamura Prize.” This prize recognizes the achievements of young researchers in the field of particle physics in a broad sense. The winning citation is entitled “Non-perturbative foundation of generalized symmetries -Wilsonian lattice regularized point of view-" The award ceremony will be held in March 2025 at the Spring Meeting of the Japanese Physical Society. Congratulations, Okuto!
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2024-09-20
Press Release
Energy Transmission Requires Information: Approaching the Physics of Boundary Interfaces
A research group, including Yuya Kusuki (Associate Professor, Institute for Advanced Study, Kyushu University / Visiting Scientist, iTHEMS), has demonstrated a clear inequality in 2-dimensional conformal quantum field theory. The inequality links the energy transmission rate, the information transmission rate, and an indicator of the size of the Hilbert space in quantum field theory (specifically, the growth rate of the number of states at high energy) as follows: (energy transmission rate) ≤ (information transmission rate) ≤ (indicator of the size of the Hilbert space). For more details, please refer to Kyushu University's website via the related links below.
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2024-09-19
Paper of the WeekWeek 4, September 2024
Title: Optimal collision energy for realizing macroscopic high baryon-density matter Author: Hidetoshi Taya, Asanosuke Jinno, Masakiyo Kitazawa, Yasushi Nara arXiv: http://arxiv.org/abs/2409.07685v1
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2024-09-13
Press Release
How should the isolation of Mpox patients be ended? - Development of a simulator to verify the timing of isolation termination
A research group led by Professor Shingo Iwami (Professor, Graduate School of Science, Nagoya University / Visiting Scientist, iTHEMS), in collaboration with Dr. Fuminari Miura (Ehime University / Dutch National Institute for Public Health and the Environment (RIVM)), has developed a new simulator (simulation software) to verify the timing for ending the isolation of Mpox (Clade II) patients. For further details, please visit the Nagoya University Research Information website via the relevant links.
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2024-09-12
Paper of the WeekWeek 3, September 2024
Title: Exotically knotted closed surfaces from Donaldson's diagonalization for families Author: Hokuto Konno, Abhishek Mallick, Masaki Taniguchi arXiv: http://arxiv.org/abs/2409.07287v1 Title: Relativistic BEC extracted from a complex FRG flow equation Author: Fumio Terazaki, Kazuya Mameda, Katsuhiko Suzuki arXiv: http://arxiv.org/abs/2409.04361v1 Title: Remote Hawking-Moss instanton and the Lorentzian path integral Author: Daiki Saito, Naritaka Oshita arXiv: http://arxiv.org/abs/2409.03978v1 Title: From annular to toroidal pseudo knots Author: Ioannis Diamantis, Sofia Lambropoulou, Sonia Mahmoudi arXiv: http://arxiv.org/abs/2409.03537v1
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2024-09-10
Hot Topic
Farewell message from Keita Mikami
Our colleague Keita Mikami will move on to a new career as an assistant professor at University of Hyogo as of Oct. 1, 2024. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Keita Mikami: My five and a half years at iTHEMS have been truly outstanding. The environment here has been exceptional, significantly enriching my research in many different ways. One of the key highlights has been the stimulating and insightful discussions with researchers from diverse fields. Furthermore, my experiences working on MACS, organizing math seminars, and coordinating other events such as SSP have been invaluable. My research visit to UCB was also an incredible experience. I would like to extend my sincere gratitude to all the researchers and assistants at iTHEMS. I am especially grateful to the director, Hatsuda-san, for his unwavering support.As I move forward, I hope to continue interacting with the iTHEMS community, albeit in a new capacity. Once again, thank you for these five wonderful years.
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2024-09-10
Research News
RIKEN Research: More magic in twisted layers of graphene
Magnetic fields can engineer flat bands in twisted graphene layers to create a new playground for exotic physics, RIKEN physicists have shown. The exotic properties of graphene—a single layer of carbon atoms in a hexagonal lattice—are now well established. Electrons effectively move through graphene as if they have no mass. This is an exciting prospect for creating electronic devices with functionalities beyond those of silicon. But things get even weirder when two or more layers of graphene are combined. To read more, please visit the related link.
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2024-09-05
Paper of the WeekWeek 2, September 2024
Title: Understanding the puzzle of angular momentum conservation in beta decay and related processes Author: Gordon Baym, Jen-Chieh Peng, C. J. Pethick arXiv: http://arxiv.org/abs/2405.15011v2 Title: Variational Monte Carlo with Neural Network Quantum States for Yang-Mills Matrix Model Author: Norbert Bodendorfer, Onur Oktay, Vaibhav Gautam, Masanori Hanada, Enrico Rinaldi arXiv: http://arxiv.org/abs/2409.00398v1 Title: Waveform distortion for temperature compensation and synchronization in circadian rhythms: An approach based on the renormalization group method Author: Shingo Gibo, Teiji Kunihiro, Tetsuo Hatsuda, Gen Kurosawa arXiv: http://arxiv.org/abs/2409.02526v1
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2024-09-02
Research News
RIKEN Research: The link between fuzzy images and quantum fields
Mathematical solutions to thorny quantum problems can be found more quickly by exploiting the correspondence between the statistical methods used in deep learning and techniques for implementing quantum simulations, a team led by a RIKEN researcher has shown. One of the most successful theories in modern physics, quantum field theory is physicists’ attempt to combine three theories—classical field physics, Einstein’s special relativity and quantum mechanics—into a single mathematical model. It has been successful in solving problems in particle physics and condensed-matter physics, but these calculations are computationally intensive and require a lot of computer power. To read more, please visit the related link.
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2024-08-29
Paper of the WeekWeek 5, August 2024
Title: On the elastoplastic behavior in collisional compression of spherical dust aggregates Author: Sota Arakawa, Hidekazu Tanaka, Eiichiro Kokubo, Satoshi Okuzumi, Misako Tatsuuma, Daisuke Nishiura, Mikito Furuichi arXiv: http://arxiv.org/abs/2408.15573v1 Title: Constraints on the parameter space in dark matter admixed neutron stars Author: Ankit Kumar, Hajime Sotani arXiv: http://arxiv.org/abs/2408.15312v1 Title: Polaronic neutron in dilute alpha matter: A $p$-wave Bose polaron Author: Hiroyuki Tajima, Hajime Moriya, Tomoya Naito, Wataru Horiuchi, Eiji Nakano, Kei Iida arXiv: http://arxiv.org/abs/2408.15043v1 Title: The hardest-hit home run? Author: Donald C. Warren arXiv: http://arxiv.org/abs/2408.14529v1 Title: Selection changes productivity over time Author: William Godsoe, Ryosuke Iritani, Elena Moltchanova, Rua Murray, Philipp Wacker Journal Reference: Authorea doi: https://doi.org/10.22541/au.172463311.10031706/v1 Title: Construction of weaving and polycatenane motifs from periodic tilings of the plane Author: Mizuki Fukuda, Motoko Kotani, Sonia Mahmoudi arXiv: http://arxiv.org/abs/2206.12168v3
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2024-08-27
Hot Topic
Farewell message from Takeru Yokota
Our colleague Takeru Yokota will move to RIKEN Quantum Computer Center (RQC) starting from September 1, 2024, and will then be posted to a University as a faculty member as of April 1, 2025. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Takeru Yokota: I am grateful for having spent the past three and a half years in an environment where I could focus on research at iTHEMS. Engaging in discussions with researchers from various fields of mathematical sciences has been a valuable experience. I would like to express my deep appreciation to the director, Hatsuda-san, the staff, and the assistants who created such a wonderful environment, as well as to the members who engaged in these valuable discussions. I look forward to continuing my interactions with the members of iTHEMS in the future.
129 news in 2024