News
74 news in 2024
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2024-07-26
Hot Topic
SLMath Summer Graduate School "h-principle" on July 1, 2024
The SLMath Summer Graduate School "h-principle" Sendai 2024 was held from July 1 to July 12, 2024 at TOKYO ELECTRON House of Creativity (Chi no Yakata) in Katahira Campus of Tohoku University. This two weeks lomg summer graduate school was organized by Simons Laufer Mathematical Sciences Institute (SLMath) and RIKEN iTHEMS, and coorganized by Mathematical Science Center for Co-creative Society (MathCCS) and Tohoku Forum for Creativity (TFC) of Tohoku University. There were 18 graduate students from the supporting institutions of SLMath and 12 graduate students from Japanese universities. There were four courses consisting of five 90 mintes lectures given by Emmy Murphy (Toront University), Dominik Inauen (Leipzig University) and Takashi Tsuboi (RIKEN iTHEMS / Tohoku University). The titles of lectures were "h-principles in smooth topology" by Emmy Murphy and "Riemannian geometry and applications to fluid dynamics" by Dominik Inauen in the first week, and "Contact and symplectic flexibility" by Emmy Murphy and "Foliation theory and diffeomorphism groups" by Takashi Tsuboi in the second week. We took video of the lectures and it can be seen later from the website of SLMath. There were 4 teaching assistants, Toru Yoshiyasu (Kyoto University of Education), Noboru Ogawa (Tokai University), Masato Ogawa (Tohoku University) and Sonia Mahmoudi (SUURI-COOL Sendai, Tohoku University) who took care of the 30 graduate students. Some details can be seen at SLMath website. The staffs of RIKEN iTHEMS, SUURI-COOL Sendai and MathCCS supported this summer graduate school for all the time, and all the participants are realy grateful for their help. TOKYO ELECTRON House of Creativity is really a nice place for the discussions in front of blackboards, and the house was filled with the discussions among the participants for 9:00 - 17:30 and some of the discussions continued in the meeting room in the hotel. The welcome party and the farewell party of Summer Graduate School were held jointy with the participants of G-RIPS Sendai 2024 which went on at MathCCS and which iTHEMS is cohosting. Reported by Takashi Tsuboi
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2024-07-25
Paper of the WeekWeek 4, July 2024
Title: Restricted Boltzmann Machines Propagators for Auxiliary Field Diffusion Monte Carlo Author: Jordan M. R. Fox, Alessandro Lovato, Alessandro Roggero, Ermal Rrapaj arXiv: http://arxiv.org/abs/2407.14632v1
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2024-07-24
Press Release
Decoding Protein Condensation - Predicting Condensation of Proteins from Amino Acid Sequences -
The research team of Kyosuke Adachi (Research Scientist, iTHEMS / Research Scientist, Nonequilibrium Physics of Living Matter RIKEN Hakubi Research Team, RIKEN BDR) and Kyogo Kawaguchi (Team Leader, Nonequilibrium Physics of Living Matter RIKEN Hakubi Research Team, RIKEN BDR / Associate Professor, Institute for Physics of Intelligence, The University of Tokyo) has proposed a theory that predicts the condensation of protein molecules and demixing of condensates based on amino acid sequences. This research is expected to contribute to elucidating the mechanisms for the formation of membraneless organelles in cells and, in the future, to develop into a theory that predicts the effect of mutations in proteins sequences on cellular functions. For more details, please refer to the related link.
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2024-07-24
Research NewsThe annual S&T poster for everyone “One S&T poster for Every Household” produced by the MEXT celebrates its 20th anniversary with a special issue
To commemorate the 20th anniversary this year of the annual S&T poster for everyone “One S&T poster for Every Household” published by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) during Science and Technology Week in April every year, a PDF version of the Science Window ‘One S&T poster for Every Household 20th Anniversary Special Issue’ was published in June. You can read all pages from the first one, ‘Periodic Table of Elements’, to the 20th, ‘Mathematics’, as well as columns on three themes: the Periodic Table of Elements, the Human Genome Map and Mathematics. The printed booklet is expected to be completed in autumn.
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2024-07-18
Paper of the WeekWeek 3, July 2024
Title: DMRG study of the theta-dependent mass spectrum in the 2-flavor Schwinger model Author: Etsuko Itou, Akira Matsumoto, Yuya Tanizaki arXiv: http://arxiv.org/abs/2407.11391v1 Title: Quantum-inspired information entropy in multi-field turbulence Author: Go Yatomi, Motoki Nakata arXiv: http://arxiv.org/abs/2407.09098v1 Title: Toric degenerations of Calabi--Yau complete intersections and metric SYZ conjecture Author: Keita Goto, Yuto Yamamoto arXiv: http://arxiv.org/abs/2407.09133v1 Title: Neutron-quark stars: Discerning viable alternatives for the higher-density part of the equation of state of compact stars Author: Sudipta Hensh, Yong-Jia Huang, Toru Kojo, Luca Baiotti, Kentaro Takami, Shigehiro Nagataki, Hajime Sotani arXiv: http://arxiv.org/abs/2407.09446v1
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2024-07-11
Paper of the WeekWeek 2, July 2024
Title: Krylov fractality and complexity in generic random matrix ensembles Author: Budhaditya Bhattacharjee, Pratik Nandy arXiv: http://arxiv.org/abs/2407.07399v1
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2024-07-11
Press Release
Data and Mathematics toward Understanding the Mysteries of Hibernation
Body temperature of small mammals during hibernation drops close to the ambient temperature (< 10℃). However, it doesn't stay low throughout hibernation but fluctuates multiple times between this low temperature and their normal body temperature. These significant temperature changes are a crucial part of hibernation, but their physiological significance and control mechanisms are not well understood. Using high-precision experimental data and mathematical model, an international collaborative research group (including Shingo Gibo and Gen Kurosawa, iTHEMS) has challenged to understand what occurs during these temperature changes. They found a model that simultaneously reproduces data of multiple hibernators.This collaboration includes Yoshifumi Yamaguchi (Hokkaido University), Isao Tokuda (Ritsumeikan University), Elena Gracheva (Yale University), Sviatoslav Bagriantsev (Yale University). Paper was published in npj Biological Timing and Sleep, a new journal from Nature Portfolio. For more details, please refer to the related link.
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2024-07-04
Paper of the WeekWeek 1, July 2024
Title: Bispectrum from inflation/bouncing Universe in VCDM Author: Alexander Ganz, Paul Martens, Shinji Mukohyama, Ryo Namba arXiv: http://arxiv.org/abs/2407.02882v1 Title: Reconstruction of ringdown with excitation factors Author: Naritaka Oshita, Vitor Cardoso arXiv: http://arxiv.org/abs/2407.02563v1 Title: Pushforward measures on homogeneous spaces of non-unimodular groups and properties of modular functions Author: Takashi Satomi arXiv: http://arxiv.org/abs/2407.00670v1 Title: Groupoid homology and K-theory for algebraic actions from number theory Author: Chris Bruce, Yosuke Kubota, Takuya Takeishi arXiv: http://arxiv.org/abs/2407.01952v1 Title: 4D Chern-Simons theory with auxiliary fields Author: Osamu Fukushima, Kentaroh Yoshida arXiv: http://arxiv.org/abs/2407.02204v1 Title: Optimal version of the fundamental theorem of chronogeometry Author: Michiya Mori, Peter Šemrl arXiv: http://arxiv.org/abs/2406.18874v1
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2024-07-01
Seminar Report
DEEP-IN Seminar by Chen Xiaowen on June 27, 2024
The latest DEEP-IN seminar, also a joint iTHEMS Biology seminar series, was held on June 27. The seminar featured an impressive talk by Dr. Chen Xiaowen, a postdoctoral researcher at LPENS, CNRS, France. Conducted virtually, the seminar attracted a broad audience interested in understanding collective behavior from a physics perspective. Chen Xiaowen's talk, "Inferring Collective Behavior from Social Interactions to Population Coding," focused on the ubiquitous nature of collective behavior, from social animals to neural networks. These behaviors, encoded in interactions between individuals or cells, play critical roles in diverse biological systems. While recent advances in statistical physics have provided new insights, much of the traditional research has overlooked the temporal aspect, focusing instead on static, steady-state distributions. Xiaowen introduced two significant advancements that address this gap by incorporating the temporal dynamics of collective behavior. The first study examined the co-localization patterns of social mice. By developing a novel inference method called generalized Glauber dynamics (GGD), the research team could capture both static and dynamic features of the data. The GGD dynamics not only explained these features effectively but also provided insights into the sociability of different mice strains through the inferred interactions. The second part of the seminar focused on neuronal interactions in the larval zebrafish hindbrain. Although many details were left out in this part due to time constraints, Xiaowen provided a comprehensive overview of how dynamic analyses can fill the gap left by traditional static approaches and improve our understanding of neuronal interactions. Stay tuned for more seminars and updates from the DEEP-IN events! Reported by Lingxiao Wang
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2024-06-27
Paper of the WeekWeek 5, June 2024
Title: Scale setting and hadronic properties in light quark sector with $(2+1)$-flavor Wilson fermions at the physical point Author: Tatsumi Aoyama, Takahiro M. Doi, Takumi Doi, Etsuko Itou, Yan Lyu, Kotaro Murakami, Takuya Sugiura arXiv: http://arxiv.org/abs/2406.16665v1 Title: Couplings of torsional and shear oscillations in a neutron star crust Author: Hajime Sotani, Arthur G. Suvorov, Kostas D. Kokkotas arXiv: http://arxiv.org/abs/2406.17195v1
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2024-06-26
Hot Topic
Professor, how many dimensions does "space" have!? ── Asking Theoretical Physicist Yasunori Nomura about the Nature of "Space" from Subatomic to Cosmic Scale
In VOL.53 of the Japanese edition of the magazine 'WIRED,' we delve deeply into the potential of "space" × "computing." However, how should we define the very essence of "space"? A superficial exploration would undoubtedly result in a half-baked understanding. Therefore, we sought the wisdom of one of the foremost theoretical physicists of our time. We visited the office of Yasunori Nomura on the 4th floor of the Physics Department building at the University of California, Berkeley (UC Berkeley). Professor Nomura, what exactly is "space"? What is space? This question is directly related to the progress of modern physics. It can be said that modern physics is a discipline that seeks to understand "space and time." So, before delving into the perspective of quantum gravity theory, which is my specialty, I would like to briefly explain the relationship between physics and space. For the continuation, please visit the WIRED website through the related link.
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2024-06-20
Paper of the WeekWeek 4, June 2024
Title: Probing quantum chaos through singular-value correlations in sparse non-Hermitian SYK model Author: Pratik Nandy, Tanay Pathak, Masaki Tezuka arXiv: http://arxiv.org/abs/2406.11969v1 Title: On localizing groups of exotic diffeomorphisms of 4-manifolds Author: Hokuto Konno, Abhishek Mallick arXiv: http://arxiv.org/abs/2406.11773v1
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2024-06-13
Paper of the WeekWeek 3, June 2024
Title: Geometry of Carrollian Stretched Horizons Author: Laurent Freidel, Puttarak Jai-akson arXiv: http://arxiv.org/abs/2406.06709v1 Title: Learning QM/MM potential using equivariant multiscale model Author: Yao-Kun Lei, Kiyoshi Yagi, Yuji Sugita Journal Reference: J. Chem. Phys. 160, 214109 (2024) doi: https://doi.org/10.1063/5.0205123 Title: Power-law correlation in the homogeneous disordered state of anisotropically self-propelled systems Author: Kyosuke Adachi, Hiroyoshi Nakano arXiv: http://arxiv.org/abs/2406.06138v1 Title: Hawking-Page and entanglement phase transition in 2d CFT on curved backgrounds Author: Akihiro Miyata, Masahiro Nozaki, Kotaro Tamaoka, Masataka Watanabe arXiv: http://arxiv.org/abs/2406.06121v1 Title: Anomaly inflow for dipole symmetry and higher form foliated field theories Author: Hiromi Ebisu, Masazumi Honda, Taiichi Nakanishi arXiv: http://arxiv.org/abs/2406.04919v1 Title: (In)stability of the black hole greybody factors and ringdowns against a small-bump correction Author: Naritaka Oshita, Kazufumi Takahashi, Shinji Mukohyama arXiv: http://arxiv.org/abs/2406.04525v1 Title: $_Ξ^{5}H $ hypernuclei by folding the state-of-the-art $ ΞN $ interactions Author: Faisal Etminan arXiv: http://arxiv.org/abs/2406.03572v1
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2024-06-12
Hot Topic
Faculty of Science 2023 Year in Review: Catherine Beauchemin
Catherine Beauchemin(Deputy Program Director, iTHEMS) was interviewed by the Toronto Metropolitan University about her interdisciplinary research and its impact. For a physics professor, Catherine Beauchemin certainly gets involved in biology research more than you might expect. Her embrace of interdisciplinarity has taken her to many places, currently to Japan, where she is serving as Deputy Program Director of the Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) programme at RIKEN, Japan's largest research institute. One of the best aspects? “My position allows me to host TMU trainees in Japan and expand their research and life horizons.” Please see the related links for more details.
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2024-06-06
Paper of the WeekWeek 2, June 2024
Title: Lattice study on finite density QC$_2$D towards zero temperature Author: Kei Iida, Etsuko Itou, Kotaro Murakami, Daiki Suenaga arXiv: http://arxiv.org/abs/2405.20566v1
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2024-06-05
Press ReleaseRICOH and RIKEN Develop a Proprietary Algorithm to Detect Indicators of Technology Commercialization
RICOH Company, Ltd. (President and CEO: Akira Oyama) and the RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS; led by Senior Visiting Scientist Hideaki Aoyama and Visiting Scientist Wataru Souma) have developed a new algorithm that applies their previously developed technology to perform multi-analysis of keywords commonly appearing in both patents and academic papers.
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2024-05-30
Paper of the WeekWeek 5, May 2024
Title: Two classes of Majorana neutrinos in the seesaw model Author: Kazuo Fujikawa, Anca Tureanu arXiv: http://arxiv.org/abs/2405.18702v1 Title: Actions of tensor categories on Kirchberg algebras Author: Kan Kitamura arXiv: http://arxiv.org/abs/2405.18429v1 Title: Complementarity for a Dynamical Black Hole Author: Benjamin Concepcion, Yasunori Nomura, Kyle Ritchie, Samuel Weiss arXiv: http://arxiv.org/abs/2405.15849v1
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2024-05-29
Hot TopicEvent report: OIST x iTHEMS Workshop Series 1
Renowned globally for its eminent scientists and cutting-edge infrastructures, RIKEN is the largest Japanese research organization in basic natural sciences. This distinction renders RIKEN a very attractive partner for OIST, a burgeoning research-oriented university. Cementing their collaborative endeavorsm, both institutes signed bilateral agreements including a MoU in 2020-2021, triggering and facilitating ambitious projects and fostering new collaborations. Among these, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) has emerged as a dynamic hub for active collaboration with OIST. The workshop “OIST x iTHEMS Exploring the Mysteries of the Universe and Life - Series 1 | Cosmic ray and Life project” held at OIST on March 4-6 may be one best example of the type of brainstorming needed for addressing the most challenging questions. To read more, please visit the related link.
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2024-05-23
Paper of the WeekWeek 4, May 2024
Title: Scalar Quasi-Normal Modes of a Loop Quantum Black Hole Author: Etera R. Livine, Clara Montagnon, Naritaka Oshita, Hugo Roussille arXiv: http://arxiv.org/abs/2405.12671v1 Title: $ {}^{164} \mathrm{Pb} $: A possible heaviest $ N = Z $ doubly-magic nucleus Author: Tomoya Naito, Masaaki Kimura, Masaki Sasano arXiv: http://arxiv.org/abs/2405.12095v1 Title: Magnetar QPOs and neutron star crust elasticity Author: Hajime Sotani arXiv: http://arxiv.org/abs/2405.11858v1 Title: Tidal Love Numbers from EFT of Black Hole Perturbations with Timelike Scalar Profile Author: Chams Gharib Ali Barura, Hajime Kobayashi, Shinji Mukohyama, Naritaka Oshita, Kazufumi Takahashi, Vicharit Yingcharoenrat arXiv: http://arxiv.org/abs/2405.10813v1 Title: Building imaginary-time thermal filed theory with artificial neural networks Author: Tian Xu, Lingxiao Wang, Lianyi He, Kai Zhou, Yin Jiang arXiv: http://arxiv.org/abs/2405.10493v1 Title: Quantum Dynamics in Krylov Space: Methods and Applications Author: Pratik Nandy, Apollonas S. Matsoukas-Roubeas, Pablo Martínez-Azcona, Anatoly Dymarsky, Adolfo del Campo arXiv: http://arxiv.org/abs/2405.09628v1
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2024-05-20
Press Release
Discovery of a Method to Systematically Create New Types of Anyons: Potential New Applications for Quantum Computers
In physics, understanding phases of matter, such as liquids, solids, and gases, is a crucial task, as substances can exist in different states (phases) depending on the conditions. In modern classification of phases, anyons —quasiparticles with fractional charge— are of significant importance and are also being studied for their potential applications in quantum computing. A collaborative research group, including Masazumi Honda (Senior Research Scientist, iTHEMS) and Taiichi Nakanishi (Junior Research Associate, iTHEMS), has discovered a theoretical framework to systematically construct a new type of anyons with restricted motion. For more details, please refer to the press release article from Kyoto University available through the related link.
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2024-05-16
Paper of the WeekWeek 3, May 2024
Title: Cables of the figure-eight knot via real Frøyshov invariants Author: Sungkyung Kang, JungHwan Park, Masaki Taniguchi arXiv: http://arxiv.org/abs/2405.09295v1 Title: Universality in supernova gravitational waves with proto-neutron star properties Author: Hajime Sotani, Bernhard Müller, Tomoya Takiwaki arXiv: http://arxiv.org/abs/2405.09030v1 Title: Simulating Floquet scrambling circuits on trapped-ion quantum computers Author: Kazuhiro Seki, Yuta Kikuchi, Tomoya Hayata, Seiji Yunoki arXiv: http://arxiv.org/abs/2405.07613v1 Title: Diffusion Models as Stochastic Quantization in Lattice Field Theory Author: Lingxiao Wang, Gert Aarts, Kai Zhou doi: https://doi.org/10.1007/JHEP05(2024)060 arXiv: http://arxiv.org/abs/2309.17082v2
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2024-05-09
Paper of the WeekWeek 2, May 2024
Title: Neutrinos and gamma rays from beta decays in an active galactic nucleus NGC 1068 jet Author: Koichiro Yasuda, Yoshiyuki Inoue, Alexander Kusenko arXiv: http://arxiv.org/abs/2405.05247v1 Title: Remark on neutrino oscillations Author: Kazuo Fujikawa arXiv: http://arxiv.org/abs/2405.03940v1 Title: CloudDiff: Super-resolution ensemble retrieval of cloud properties for all day using the generative diffusion model Author: Haixia Xiao, Feng Zhang, Lingxiao Wang, Wenwen Li, Bin Guo, Jun Li arXiv: http://arxiv.org/abs/2405.04483v1 Title: Extracting macroscopic quantities in crowd behaviour with deep learning Author: Shuaiqi Zhou, Rongrong Shi, and Lingxiao Wang Journal Reference: Phys. Scr. 99 065213 doi: https://doi.org/10.1088/1402-4896/ad423e
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2024-05-02
Paper of the WeekWeek 1, May 2024
Title: Arbitrage impact on the relationship between XRP price and correlation tensor spectra of transaction networks Author: Abhijit Chakraborty, Yuichi Ikeda arXiv: http://arxiv.org/abs/2405.00051v1
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2024-04-28
Hot Topic
Program Director Tetsuo Hatsuda has been elected a new International Honorary Member of the American Academy of Arts and Sciences
On 24 April 2024, the American Academy of Arts and Sciences announced the election of 250 new members (25 new International Honorary Members) and Tetsuo Hatsuda, Program Director of the RIKEN iTHEMS, was elected as a new International Honorary Member. The American Academy of Arts and Sciences is the oldest academy in the United States, founded in 1780, and the Academy's mission is stated as follows: Founded in 1780, the American Academy of Arts and Sciences honors excellence and convenes leaders from every field of human endeavor to examine new ideas, address issues of importance to the nation and the world, and work together “to cultivate every art and science which may tend to advance the interest, honor, dignity, and happiness of a free, independent, and virtuous people.” "We honor these artists, scholars, scientists, and leaders in the public, non-profit, and private sectors for their accomplishments and for the curiosity, creativity, and courage required to reach new heights,” said David Oxtoby, President of the Academy. “We invite these exceptional individuals to join in the Academy’s work to address serious challenges and advance the common good." From RIKEN, Akito Arima (former President of RIKEN), Ryoji Noyori (former President of RIKEN), Masatoshi Takeichi (former Director of the Center for Developmental Biology) and Shigeyuki Yokoyama (former Director of the RIKEN Systems and Structural Biology Center) have been selected. This year, two Japanese have been selected: Tetsuo Hatsuda (Director of the RIKEN iTHEMS) and Isao Kumakura (Professor Emeritus, National Museum of Ethnology). Induction ceremonies for new members will take place on 21 September in Cambridge, Massachusetts. Comment from Tetsuo Hatada, Program Director: "I feel very honoured to be appointed as a foreign honorary member of the Academy. I hope to contribute to the well-being of humanity and the development of science in cooperation with my seniors in various fields."
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2024-04-28
Hot Topic
Introducing the annual S&T poster for everyone titlled “Mathematics Connecting to the World: One S&T poster for Every Household” at the 'RIKEN DAY: Let’s Talk with Researchers!'
Tomoya Nagai (iTHEMS Coordinator), Daiki Kumakura (iTHEMS Junior Research Associate), and Nahoko Shinozaki (freelance announcer / mathematics communicator) on behalf of the production team of the annual S&T poster for everyone titlled “Mathematics Connecting to the World: One S&T poster for Every Household”, appeared at the monthly online event ’RIKEN DAY: Let's talk with researchers!’ organised by the RIKEN Public Relations Office to talk about the poster and their usual work and research. A total of 144 people participated, with a maximum of 78 on ZOOM and 66 on YouTube, and ZOOM participants consisted of 37% each of elementary and junior high school students and over 50s in general. The event was very enjoyable, with many sharp questions from the primary schools students, such as "Can everything in the world be expressed mathematically?”.
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2024-04-25
Paper of the WeekWeek 4, April 2024
Title: Digital Quantum Simulation for Spectroscopy of Schwinger Model Author: Dongwook Ghim, Masazumi Honda arXiv: http://arxiv.org/abs/2404.14788v1 Title: A mathematical model of thermoplastic elastomers for analysing the topology of microstructures and mechanical properties during elongation Author: Hiroki Kodama, Hiroshi Morita, Motoko Kotani Journal Reference: Proc. R. Soc. A 480:2286 (2024) doi: https://doi.org/10.1098/rspa.2023.0389
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2024-04-25
Seminar Report
DEEP-IN Working Group Kick-Off Meeting
The DEEP-IN Working Group commenced its kick-off meeting on April 23, 2024, with a hybrid gathering of more than 40 participants including 19 members. The session began with opening remarks from Lingxiao Wang, self-introductions from each member, and a concise introduction to the applications of deep learning for solving inverse problems in sciences. Notable speakers included Akinori Tanaka from RIKEN-AIP/iTHEMS, who gave a vivid introduction to machine learning and his current work, and Gert Aarts from Swansea University, who explored lattice field theories with deep learning, which could also benefit deep learning. Márcio Ferreira introduced the conditional variational auto-encoder(cVAE) for building dense matter equation of states from neutron star observations. Andreas Ipp gave a brief introduction to his work on exploring the early stages of heavy ion collisions and training L-CNNs for lattice gauge theories. The last speaker was Akira Harada, who presented his current work on the application of machine learning to the simulation of supernovae. During the discussion, members actively brainstormed potential projects and discussed methodologies, emphasizing the importance of interdisciplinary collaboration. The meeting concluded with Tetsuo Hatsuda's optimistic closing remarks about the group's potential to innovate at the intersection of deep learning and physics. There will be more activities from the DEEP-IN Working Group in the near future. Reported by Lingxiao Wang
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2024-04-18
Paper of the WeekWeek 3, April 2024
Title: Black holes, multiple propagation speeds and energy extraction Author: Vitor Cardoso, Shinji Mukohyama, Naritaka Oshita, Kazufumi Takahashi arXiv: http://arxiv.org/abs/2404.05790v1 Title: Linear stability of vector Horndeski black holes Author: Che-Yu Chen, Antonio De Felice, Shinji Tsujikawa arXiv: http://arxiv.org/abs/2404.09377v1 Title: Towards a spatial cat state of a massive pendulum Author: Satoshi Iso, Jinyang Li, Nobuyuki Matsumoto, Katsuta Sakai arXiv: http://arxiv.org/abs/2404.08435v1 Title: Upper Limit of Sound Speed in Nuclear Matter: A Harmonious Interplay of Transport Calculation and Perturbative QCD Constraint Author: Shao-Peng Tang, Yong-Jia Huang, Ming-Zhe Han, Yi-Zhong Fan arXiv: http://arxiv.org/abs/2404.09563v1 Title: Search for synchrotron emission from secondary electrons of proton-proton interaction in Galactic PeVatron candidate HESS J1641$-$463 Author: Naomi Tsuji, Takaaki Tanaka, Samar Safi-Harb, Felix Aharonian, Sabrina Casanova, Roland Kothes, Emmanuel Moulin, Hiroyuki Uchida, Yasunobu Uchiyama arXiv: http://arxiv.org/abs/2404.11012v1 Title: Observational features of reflection asymmetric black holes Author: Che-Yu Chen, Hung-Yi Pu arXiv: http://arxiv.org/abs/2404.07055v1 Title: Involutive Khovanov homology and equivariant knots Author: Taketo Sano arXiv: http://arxiv.org/abs/2404.08568v2 Title: Non-archimedean SYZ fibrations via tropical contractions Author: Yuto Yamamoto arXiv: http://arxiv.org/abs/2404.04972v1 Title: Directional Invariants of Doubly Periodic Tangles Author: Ioannis Diamantis, Sofia Lambropoulou, Sonia Mahmoudi arXiv: http://arxiv.org/abs/2404.05092v1 Title: Deciphering Radio Emissions from Accretion Disk Winds in Radio-Quiet Active Galactic Nuclei Author: Tomoya Yamada, Nobuyuki Sakai, Yoshiyuki Inoue, Tomonari Michiyama arXiv: http://arxiv.org/abs/2404.04632v1 Title: Genomic view of heavy-ion induced deletions associated with distribution of essential genes in Arabidopsis thaliana Author: Kotaro Ishii, Yusuke Kazama, Tomonari Hirano, Jeffrey A Fawcett, Muneo Sato, Masami Yokota Hirai, Fujiko Sakai, Yuki Shirakawa, Sumie Ohbu, Tomoko Abe Journal Reference: Front. Plant Sci. 15:1352564. (2024) doi: https://doi.org/10.3389/fpls.2024.1352564
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2024-04-17
Hot Topic
The commemorative lecture for "Science and Technology Week” was held at the Liberal Democratic Party of Japan Headquarters
The Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS), which planned and supervised the annual S&T poster for everyone titlled “Mathematics Connecting to the World: One S&T poster for Every Household”, was invited to the commemorative lecture for "Science and Technology Week” held on April 11 at the Liberal Democratic Party of Japan Headquarters and introduced the related research of iTHEMS young researchers. The lecture was moderated by Kenji Yamada, Director of the Education, Culture, Sports, Science and Technology Division, and opened with greetings from Kisaburo Tokai, Chairperson of the Policy Research Council, Keitaro Ohno, Chairperson of the Research Commission on Science, Technology and Innovation Strategy, and Soichiro Imaeda, State Minister of Education, Culture, Sports, Science and Technology. The lecture was also attended by members of the LDP Student Division. Program: Report: The annual S&T poster for everyone titlled “Mathematics Connecting to the World: One S&T poster for Every Household” Makiko Naka, Executive Director, RIKEN Tomoya Nagai, Representative of the “Mathematics: One S&T poster for Every Household" Production Team, iTHEMS Coordinator Memorial Lecture: Introduction of related research by young RIKEN iTHEMS researchers (Coordinator) Tetsuo Hatsuda, Program Director of iTHEMS "Elucidating the Quantum World: Observational and AI Approaches" Shunji Matsuura, Senior Researcher "Mathematics of Biodiversity" Ryosuke Iritani, Senior Researcher "The Universe Observed with X-rays" Naomi Tsuji, Visiting Researcher "Mathematical Basis for Digital Health Mapping of Bacterial Diseases" Daiki Kumakura, Graduate Student Research Associate
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2024-04-12
Seminar Report
iTHEMS Biology Seminar by Haruka Kitayama on April 4, 2024
This time, I invited Mr. Haruka Kitayama from Hokkaido University to give a seminar on fieldwork and genomics of African monkeys. First, there was a description of mixed-species groups of two types of monkeys living in the forests of Uganda. Next, there was an explanation of the impact this mixing has on the genetics of the two species of monkeys. In particular, the topic of genetic penetration seemed relevant to microbiology. Finally, the discussion touched not only on genetic penetration of individuals, but also on the penetration of gut bacteria in individuals, which was very interesting. Reported by Daiki Kumakura
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2024-04-11
Tomoki Ozawa was awarded the 27th Marubun Research Encouragement Award
Tomoki Ozawa (Visiting Scientist, iTHEMS) was awarded the 27th Marubun Research Encouragement Award for his research on "Theoretical contribution to topological photonics including proposals for synthetic dimensions.” The award ceremony was held on March 15, 2024. Congratulations!
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2024-04-11
Hot Topic
Kyoto University SACRA-RIKEN iTHEMS Special Lecture by Prof. Tadashi Tokieda by Tadashi Tokieda on March 28, 2024
On March 28, 2024, Tadashi Tokieda (Professor, Dept. of Math., Stanford University) gave a public lecture on "Dynamics of Rubbing the Wrong Way (逆撫での力学)" at the Tokyo office of Kyoto Univ. in front of the Tokyo station. This was a Special Lecture co-organized by SACRA Kyoto U. and RIKEN iTHEMS. The lecture was attended by a diverse audience of more than 50 people, including students from the MasaSon Foundation, academic institutions and companies, who enjoyed Tokieda's introduction to the fascinating world of dissipative and non-linear dynamics with numerous demonstrations and lively questions/discussions after the lecture. An English version of the same lecture given by Tokieda at the Institute for Advanced Study, Princeton University on February9, 2024 is available at the related link below. If you missed the SACRA-iTHEMS Lecture, please take a look at it.
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2024-04-11
Hot Topic
TadaFest 2024: Toward understanding of the Origin of Spacetime by Dr. Tsukasa Tada on April 2, 2024
On April 2, 2024, TadaFest2024: Toward Understanding of the Origin of Spacetime, was held at the Okochi Hall. Following an inspiring keynote lecture by Tsukasa Tada (iTHEMS deputy program director) on the past and future research into the emergence of spacetime, four frontline researchers gave special talks on the holographic principle, the uncertainty principle, the spintronics, and the matrix model for spacetime. The meeting was well attended face-to-face and led to a lively discussion on the fundamental principles of physics.
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2024-04-11
Hot Topic
iTHEMS Starter Meeting for FY 2024 on April 5, 2024
On April 5, 2024, the annual iTHEMS Starter Meeting was held in the iTHEMS Common Room. More than 80 people attended, including face-to-face and via Zoom. iTHEMS Programme Director Hatsuda gave an overview of iTHEMS, followed by self-introductions by new and current members. As the new academic year begins, we are looking forward to further interactions across disciplines and the development of great science.
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2024-04-09
Person of the Week
Self-introduction: Sonia Mahmoudi
Bridging the worlds of mathematics and materials science, I am interested in exploring the fascinating interactions between the topology of entangled structures and their mechanical properties. With an interdisciplinary and international background spanning mathematics, design, and engineering, I have explored various industries before transitioning to an academic career. My doctoral journey at Tohoku University focused on low-dimensional topology in woven structures, laying the foundation for my current work with SUURI-COOL Sendai. My research primarily focuses on the topological classification of periodic entangled structures from the viewpoint of knot theory and is oriented toward potential applications in academia and industry. These structures, found in a wide range of materials from textiles to molecular assemblies, exhibit remarkable properties such as elasticity, auxetic behavior, and self-folding capabilities, which are predominantly dictated by their entanglement complexity rather than the constituent materials themselves. I believe that mathematics is the key to unveiling these structure-function relations. As part of the iTHEMS community, I hope to collaborate, innovate, and contribute to the creation of new mathematical theories that could eventually support the design of sustainable and innovative materials and systems. I look forward to discussing new scientific discoveries in entangled structures with many of you.
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2024-04-05
Seminar Report
iTHEMS Seminar by Tianyin Li on April 3, 2024
The seminar on "Quantum Simulation of QCD Matter: from Hadronic Scattering to Gauge Field Qubit Encoding" delivered by Tianyin Li, a Ph.D. candidate at the Institute of Quantum Matter, South China Normal University, offered profound insights into the burgeoning field of quantum computing (QC) and its application in high-energy physics. His talk commenced with an overview of how quantum computing is revolutionizing the approach to non-perturbative problems in high-energy physics. Unlike traditional Monte Carlo simulations, which are hindered by the sign problem, quantum computing presents a viable solution for exploring dynamical and finite density problems without this limitation. Tianyin further provided an in-depth analysis of the quantum simulation of the hadronic scattering process. This included a discussion on the initial state parton distribution functions, the computation of intermediate state partonic scattering amplitudes, and the mechanisms of final state hadronization. This segment illustrated the potential of QC to offer new perspectives and methodologies in understanding the complexities of hadronic interactions. The final part was dedicated to the innovative approach of qubit encoding within the Hamiltonian formalism of lattice gauge field theory, particularly in the Coulomb gauge. The focus was primarily on a practical attempt to encode the (3+1)-dimensional Coulomb gauge QED into qubits. iTHEMS and RIKEN Quantum members proposed many questions and comments on this topic, which stimulated very fruitful discussions. In summary, this seminar underscored the importance of interdisciplinary collaboration between the fields of quantum computing and high-energy physics, promising exciting developments in the years to come. Reported by Lingxiao Wang
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2024-04-05
Seminar Report
iTHEMS Biology Seminar by Haruna Fujioka on March 26, 2024
On March 26, 2024, Dr. Haruna Fujioka from Okayama University gave a remarkable talk on behavioral ecology, sociobiology, and chronobiology using her own data of ants. In the 24-hour fluctuating environment on Earth, many organisms have evolved to have a daily rhythm. In humans, it is known that mothers can lose their daily rhythms when they are caring for their babies. Recently, Dr Fujioka developed a special experimental system for ants to discover when daily rhythms are lost. In the talk, she discussed when, how, and why ants lose their daily rhythms. During and after her talk, there was a lively discussion between the speaker and the audience. The talk was concise and easily understood by the 33+ Zoom attendees with various backgrounds. We enjoyed her talk very much. Thanks, Fujioka-san!!! Reported by Gen Kurosawa
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2024-04-04
Paper of the WeekWeek 1, April 2024
Title: Universal Bound on Effective Central Charge and Its Saturation Author: Andreas Karch, Yuya Kusuki, Hirosi Ooguri, Hao-Yu Sun, Mianqi Wang arXiv: http://arxiv.org/abs/2404.01515v1 Title: Accurate and precise quantum computation of valence two-neutron systems Author: Sota Yoshida, Takeshi Sato, Takumi Ogata, Tomoya Naito, Masaaki Kimura arXiv: http://arxiv.org/abs/2404.01694v1 Title: Order of the SU(N_f) x SU(N_f) chiral transition via the functional renormalization group Author: G. Fejos, T. Hatsuda arXiv: http://arxiv.org/abs/2404.00554v1 Title: ALMA Confirmation of Millimeter Time Variability in the Gamma-Ray Detected Seyfert Galaxy GRS 1734-292 Author: Tomonari Michiyama, Yoshiyuki Inoue, Akihiro Doi, Tomoya Yamada, Yasushi Fukazawa, Hidetoshi Kubo, Samuel Barnie arXiv: http://arxiv.org/abs/2404.00647v1 Title: Decision Mamba: Reinforcement Learning via Sequence Modeling with Selective State Spaces Author: Toshihiro Ota arXiv: http://arxiv.org/abs/2403.19925v1 Title: Stochastic failure of cell infection post viral entry: Implications for infection outcomes and antiviral therapy Author: Christian Quirouette, Daniel Cresta, Jizhou Li, Kathleen P. Wilkie, Haozhao Liang, Catherine A. A. Beauchemin Journal Reference: Sci. Rep. 13, 17243 (2023) doi: https://doi.org/10.1038/s41598-023-44180-w arXiv: http://arxiv.org/abs/2208.00637v1
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2024-04-02
Hot Topic
The annual S&T poster for everyone titlled “Mathematics: One S&T poster for Every Household” has been published
The theme for the 2024 edition of the annual S&T poster for everyone “One S&T poster for Every Household” produced by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) for Science and Technology Week in April each year, is "Mathematics Connecting to the World”, planned by the RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS). The image for downloading was published on the Science and Technology Week page of the MEXT on March 25, 2024. The poster has been distributed to elementary schools, junior high schools, high schools, and universities nationwide. The posters will also be distributed at science museums and museums in the future. A special website with more in-depth coverage of the poster's contents will also be made available. The theme is “mathematics", which is used as a tool to understand and answer questions about things in the world, and the paper introduces how mathematics is used in our daily lives based on various examples.
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2024-03-29
Research News
RIKEN Research: How the genetic battle of the sexes plays out in species that can switch sex
A model developed by RIKEN researchers incorporates species that change sex during their life cycles for the first time1, promising new insights into genes affecting the reproductive success of males and females differently. Some genes that boost the reproductive success of females can be detrimental to that of males, and vice versa—a phenomenon dubbed ‘sexual antagonism’. Sometimes such genes can be silenced in individuals of the sex they are detrimental to. However, it may take a long time for these sexually antagonistic genes to be turned off, and so they may remain active in both sexes for generations. “Researchers have long been interested in how sexual antagonism may maintain genetic variation in populations, and whether variants favoring one sex are systematically preferred,” says Thomas Hitchcock of the RIKEN Interdisciplinary Theoretical and Mathematical Sciences. To read more, please visit the related link.
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2024-03-28
Paper of the WeekWeek 5, March 2024
Title: Exact block encoding of imaginary time evolution with universal quantum neural networks Author: Ermal Rrapaj, Evan Rule arXiv: http://arxiv.org/abs/2403.17273v1 Title: A neural network approach for two-body systems with spin and isospin degrees of freedom Author: Chuanxin Wang, Tomoya Naito, Jian Li, Haozhao Liang arXiv: http://arxiv.org/abs/2403.16819v1 Title: Greybody Factors Imprinted on Black Hole Ringdowns. II. Merging Binary Black Holes Author: Kazumasa Okabayashi, Naritaka Oshita arXiv: http://arxiv.org/abs/2403.17487v1 Title: Local operator quench induced by two-dimensional inhomogeneous and homogeneous CFT Hamiltonians Author: Weibo Mao, Masahiro Nozaki, Kotaro Tamaoka, Mao Tian Tan arXiv: http://arxiv.org/abs/2403.15851v1 Title: Unveiling clean two-dimensional discrete time quasicrystals on a digital quantum computer Author: Kazuya Shinjo, Kazuhiro Seki, Tomonori Shirakawa, Rong-Yang Sun, Seiji Yunoki arXiv: http://arxiv.org/abs/2403.16718v1 Title: Monopoles and transverse knots Author: Nobuo Iida, Masaki Taniguchi arXiv: http://arxiv.org/abs/2403.15763v1 Title: The Flavor Composition of Supernova Neutrinos Author: Antonio Capanema, Yago Porto, Maria Manuela Saez arXiv: http://arxiv.org/abs/2403.14762v1 Title: Probing Goldstino excitation through the tunneling transport in a Bose-Fermi mixture with explicitly broken supersymmetry Author: Tingyu Zhang, Yixin Guo, Hiroyuki Tajima, Haozhao Liang arXiv: http://arxiv.org/abs/2403.14524v1
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2024-03-27
Award
iTHEMS received the "RIKEN Diversity Innitiative Award 2023"
On 8 March 2024, iTHEMS received the "RIKEN Diversity Promotion Award 2023". The award recognised our joint activities (lectures and visiting program) with Nara Women's University from 2020 as a progressive initiative to promote the active participation of women in the scientific field. Thanks to all those who made this activity exciting and entertaining!
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2024-03-27
Hot Topic
Farewell message from Mizuki Oikawa
Our colleague Mizuki Oikawa will move on to a new carrier (JSPS Research fellow (PD)) at University of Tokyo as of April 1st. We all will miss him and wish him the best of luck in his latest endeavor. Here is a message from Mizuki Oikawa: I spent three years at iTHEMS as a Junior Research Associate (JRA) for the first two years and a student trainee for the whole three years. It was a great experience that I could communicate with researchers with various backgrounds. Moreover, it was wonderful that iTHEMS gave me chances not only to talk about my research but also host some seminars. I am fortunately going to be a visiting researcher and looking forward to seeing you again soon.
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2024-03-26
Award
Dr. Naritaka Oshita received The 15th RIKEN Research Incentive Award (Ohbu Award)
Naritaka Ohshita (former SPDR in iTHEMS; currently HAKUBI fellow in Kyoto Univ.) received "The 15th RIKEN Research Incentive Award (Ohbu Award)" on March 12, 2024 for his outstanding achievement in the "Study of Quasi-normal Modes of Rotating Black Holes". The picture wαs taken in front of the statue of Hideki Yukawa at the Yukawa Institute for Theoretical Physics, Kyoto University. Congratulations, Naritaka!
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2024-03-24
Seminar Report
RIKEN Quantum Lecture by Takafumi Tomita on December 26, 2023
In this lecture, the recent rapid progress of cold-atom quantum computers was reviewed. In a cold-atom quantum computer, a laser-cooled atomic gas in a vacuum chamber is captured with a two-dimensional trap array called an optical tweezers array, which is an array of tightly focused laser beams. An array of cold single atoms thus created is initialized, gate operated, and readout with other laser beams. Because of its controllability and scalability, the cold-atom quantum computer has been attracting much attention, as one of the most promising candidates in the race to develop quantum-computer hardware. The lecturer described the characteristics and development trends of the cold-atom hardware, as well as the development of a cold-atom quantum computer at Institute for Molecular Science including the realization of an ultrafast quantum gate using ultrashort laser pulses. Reported by Yuta Sekino
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2024-03-23
Hot Topic
Farewell message from Akira Harada
Our colleague Akira Harada will move to National Institute of Technology (KOSEN), Ibaraki College as an Assistant Professor, starting from April 1, 2024. We all will miss him and wish him success in his new affiliation! Here is a message from Akira Harada: For these three years, I have had a very happy time as an SPDR in iTHEMS. It was an invaluable experience to talk with various people and diverse fields and topics. Events like public outreach and Super Smash Problem have been my good memories, and I feel they have provided me a good nourishment. Thanks to such opportunities and the environment for unrestricted research, I feel I have taken a step forward as a researcher. iTHEMS is very comfortable and hard to leave, but I will take further steps in my new workplace. I express my gratitude to the program coordinators, colleagues, and assistants who have engaged in various discussions and provided support. I would be grateful to keep in touch with iTHEMS members in the future.
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2024-03-21
Paper of the WeekWeek 4, March 2024
Title: Slowly decaying ringdown of a rapidly spinning black hole II: Inferring the masses and spins of supermassive black holes with LISA Author: Daiki Watarai, Naritaka Oshita, Daichi Tsuna arXiv: http://arxiv.org/abs/2403.12380v1 Title: Understanding Diffusion Models by Feynman's Path Integral Author: Yuji Hirono, Akinori Tanaka, Kenji Fukushima arXiv: http://arxiv.org/abs/2403.11262v1 Title: Exploring associations between viral titer measurements and disease outcomes in ferrets inoculated with 125 contemporary influenza A viruses Author: Troy J. Kieran, Xiangjie Sun, Taronna R. Maines, Catherine A. A. Beauchemin, Jessica A. Belser doi: https://doi.org/10.1128/jvi.01661-23 Title: Imaging a semi-classical horizonless compact object with strong redshift Author: Che-Yu Chen, Yuki Yokokura arXiv: http://arxiv.org/abs/2403.09388v1
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2024-03-14
Paper of the WeekWeek 3, March 2024
Title: Absence of ground states for anions Author: Yukimi Goto arXiv: http://arxiv.org/abs/2403.07642v1 Title: Firewalls at exponentially late times Author: Andreas Blommaert, Chang-Han Chen, Yasunori Nomura arXiv: http://arxiv.org/abs/2403.07049v1
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2024-03-13
Seminar Report
DMWG Seminar by Thanaporn Sichanugrist on January 22, 2024
In these years, the study of quantum techniques has been growing so rapidly. New ideas for quantum calculations are being developed, and even the quantum computer will be available in the near future. New quantum tools can be the key to access the physics we have not ever seen. One example is the application of the two-level qubit to searches of dark matter (DM) of dark photons. When a dark photon enters the qubit system, it behaves as an effective electric field and then excites the qubit. Direct measurements of the excitation of a qubit are already achieved. However, in order to claim the significance, we have to achieve a high signal-to-noise ratio which is, in the simplest setup, proportional to the number of the excited qubits. The gain can be improved by introducing another quantum nature to such an experiment. By constructing the quantum circuit combining single systems, the signal-to-noise ratio proportional to the square of the number of the excited qubits is obtained. Behind this magic, coherent accumulations of the phase are achieved due to the entanglement effect. Thanks to this enhancement, the sensitivity to dark photon DM can be improved by about two orders of magnitude compared to the case without a circuit. Further exciting news we have is that such equipment is coming to the real world. Superconducting qubit is realized as an ultra-cold non-linear LC circuit, the readout system is developed using a cavity. The coherence time is important for achieving good readout and it is now rapidly improving. All the system has already been assembled at the University of Tokyo, meaning that it is ready to operate. The characterization of the system is now ongoing and discussion of further improvements and enhancement starts. We should see fantastic results in the near future! Reported by Nagisa Hiroshima
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2024-03-13
Hot Topic
Farewell message from Hidetoshi Taya
Our colleague Hidetoshi Taya will move to Department of Physics, Hiyoshi Campus, Keio University as an Assistant Professor, starting from April 1, 2024. We all will miss him and wish him success in his new affiliation! Here is a message from Hidetoshi Taya: It was truly one of the greatest experiences in my whole life to be able to enjoy science at iTHEMS for four years (including the one year in 2017 as a JSPS posdoc, before joining as an SPDR from 2021). All iTHEMS researchers are so talented and have a broad interest in science, covering almost all topics of science, not only physics, but also mathematics, biology, computational science, etc. The scientific discussions in iTHEMS, therefore, have always been extremely interesting and useful. iTHEMS also gave me a unique opportunity to enhance collaborations through the Working/Study Group program, which I used with NEW (Non-Equilibrium Working Group) and the Theoretical Physics Study Group, and I have learned and enjoyed a lot through their activities. I would like to take this opportunity to express my deep gratitude to the director, Hatsuda-san, the deputy directors, and the assistants, who did/do/are making enormous efforts to achieve the great environment of iTHEMS. Finally, I sincerely hope that iTHEMS will continue to develop and expand its presence, and I look forward to continuing to collaborate and enjoy science with iTHEMS researchers. Thanks for the great four years!
74 news in 2024