ニュース

49件のニュース / 2024年

2024-04-25
今週の論文
Week 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
2024-04-25
セミナーレポート

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
2024-04-18
今週の論文
Week 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
2024-04-17
ホットトピック

「科学技術週間」記念講演会を自由民主党本部で開催

自由民主党本部で開催されました「科学技術週間」記念講演会に、学習資料「一家に１枚世界とつながる”数理”」を企画・監修した数理創造プログラム（iTHEMS）が招かれ、「一家に１枚世界とつながる”数理”」の制作報告とiTHEMS若手研究者の関連研究紹介をしました。講演会の司会進行は、山田賢司文部科学部会長が務められ、冒頭、渡海紀三朗政務調査会長、大野敬太郎科学技術・イノベーション戦略調査会長、今枝宗一郎文部科学副大臣からご挨拶をいただきました。講演会には、自民党学生部の皆様も参加いただきました。プログラム：報告：学習資料「一家に1枚　世界とつながる“数理”」について仲真紀子理化学研究所理事永井智哉「一家に1枚“数理”」制作チーム代表、iTHEMSコーディネーター　記念講演：理研iTHEMS若手研究者の関連研究紹介（コーディネーター）初田哲男数理創造プログラムディレクター「量子の世界を解き明かす：観測とAIによるアプローチ」松浦俊司上級研究員「生物多様性の数理」入谷亮介上級研究員「X線で観る宇宙」辻直美客員研究員「細菌性疾患のデジタル健康地図作成における数理基盤」熊倉大騎大学院生リサーチ・アソシエイト
2024-04-12
セミナーレポート

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
2024-04-11

小澤知己客員研究員が第27回丸文研究奨励賞を受賞

小澤知己（数理創造プログラム客員研究員）が「第27回丸文研究奨励賞」を「人工次元の提案などトポロジカルフォトニクスへの理論的貢献」の研究業績により受賞しました。贈呈式は3月15日に行われました。おめでとうございます。
2024-04-11
ホットトピック

Kyoto University SACRA-RIKEN iTHEMS Special Lecture by Prof. Tadashi Tokieda by Tadashi Tokieda on March 28, 2024

2024年3月28日、東京駅前の京都大学東京オフィスにて、時枝正氏（スタンフォード大学数学科教授）による公開講演会「逆撫での力学」が開催されました。これは京都大学SACRA(サイエンス連携探索センター）と理研iTHEMSの共催による特別講演会です。　講演会には、孫正義財団生をはじめ、学術機関、企業の方々など50名以上の多様な参加者があり、時枝氏による、数々のデモンストレーションを交えた散逸や非線形性を持つ力学の興味深い世界への導入と、講演後の活き活きとした質疑を楽しみました。 2024年2月9日にプリンストン高等研究所で行われた時枝氏による同じ講演が下記の関連リンクよりご覧いただけます。 SACRA-iTHEMS Lectureを見逃した方はこちらからご覧ください。
2024-04-11
ホットトピック

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.
2024-04-11
ホットトピック

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.
2024-04-09
今週の注目人物

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.
2024-04-05
セミナーレポート

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
2024-04-05
セミナーレポート

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
2024-04-04
今週の論文
Week 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
2024-04-02
ホットトピック

一家に1枚「世界とつながる“数理”」ポスターが公開されました

文部科学省が毎年4月の科学技術週間にあわせて制作する学習資料「一家に1枚」について、2024年度版のテーマとして理化学研究所数理創造プログラム（iTHEMS）が企画した「世界とつながる“数理”」が選ばれ、2024年3月25日にダウンロード用画像が文部科学省の科学技術週間のページに公開されました。ポスターは全国の小学校、中学校、高等学校、大学等に配布されている他、今後、科学館や博物館などでも配られる予定です。また、紙面の内容をより掘り下げた特設ウェブサイトも公開する予定です。「数学を道具として使うこと」で世界のものごとを理解したり答えを出したりする「数理」をテーマに，数理が私たちの生活でどのような形で使われているのかを、様々な事例をもとに紹介しています。
2024-03-29
リサーチニュース

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.
2024-03-28
今週の論文
Week 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
2024-03-27
受賞情報

iTHEMS received the "RIKEN Diversity Promotion 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!
2024-03-27
ホットトピック

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.
2024-03-26
受賞情報

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!
2024-03-24
セミナーレポート

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
2024-03-23
ホットトピック

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.
2024-03-21
今週の論文
Week 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
2024-03-14
今週の論文
Week 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
2024-03-13
セミナーレポート

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
2024-03-13
ホットトピック

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!
2024-03-11
今週の注目人物

Self-introduction: Lingxiao Wang

Hello everyone! My name is Lingxiao Wang (王凌霄). My research ambitiously bridges the fields of machine learning and physics, with a particular focus on using deep learning techniques, such as deep neural networks (DNNs) and generative AI, to explore QCD matter with physics models and lattice calculations. Beyond traditional boundaries, my work extends to pioneering applications of AI for Science, such as the automating scientific discovery, medical AI, and the analysis of collective behavior. My academic journey in physics commenced with a Ph.D. at Tsinghua University, China(2015-2020), where I investigated quark matter under extreme conditions. Concurrently, I was a visiting Ph.D. student at the University of Tokyo, Japan(2018-2019), focusing on chiral matter. During my postdoctoral position at the Frankfurt Institute for Advanced Studies(FIAS), Germany (2020-2023), I honed my expertise in applying machine learning to physical sciences, and simultaneously held a joint position as a Research Assistant at Insitute of Physics in Goethe University, where I applied machine learning to THz physics. Currently, I am also a Visiting Scholar at the Institute of Modern Physics, Fudan University, China, working on machine learning applications in particle and nuclear physics. For many years, I have organized a series of "Machine Learning Physics" seminars and learning clubs, providing an inclusive space for scientists interested in AI. I am especially enthusiastic about knowledge sharing and discussions that pave the way for interdisciplinary topics. My door (Main Building 249) is always open for anyone who wants to drink a cup of coffee/tea with me!
2024-03-07
ホットトピック

理化学研究所-奈良女子大学理学部合同ダイバーシティ推進ワークショップ2024が開催されました

2月29日と3月1日の2日間、奈良女子大学の数学、物理学、化学、生物学、環境科学など異なるコースの学生たち（学部2回生/3回生/4回生、大学院修士1回生/2回生の合計23名）が理研の東研究室 (CPR)、武石研究室 (CBS)、iTHEMS、 RIBF施設、佐甲研究室(CPR)を訪問しました。それぞれの研究室で、最先端研究の一端に触れるとともに、夕方からの理研研究者との交流会では、より深く研究内容について質問したり、研究者の日常を知る機会も設けられました。このダイバーシティ推進活動は、奈良女子大学理学部と理研iTHEMSが共同で推進するリケジョ育成事業の一環として、奈良女子大学での連続講義とセットで行われているもので、次年度以降も継続する予定です。
2024-02-29
今週の論文
Week 5, February 2024

Title: Estimation of the electromagnetic field in intermediate-energy heavy-ion collisions Author: Hidetoshi Taya, Toru Nishimura, Akira Ohnishi arXiv: http://arxiv.org/abs/2402.17136v1 Title: A degeneration formula of Donaldson-Thomas theory on Calabi-Yau 4-folds Author: Yalong Cao, Gufang Zhao, Zijun Zhou arXiv: http://arxiv.org/abs/2402.16103v1
2024-02-26
セミナーレポート
Math-Phys Seminar by Christy Koji Kelly on February 26, 2024

Christy gave an introductory talk on distribution and AQFT. Reported by Yuto Moriwaki
2024-02-22
今週の論文
Week 4, February 2024

Title: Lattice QCD and Baryon-Baryon Interactions Author: Sinya Aoki, Takumi Doi Journal Reference: "Handbook of Nuclear Physics" (Springer, 2023), edited by I. Tanihata, H. Toki and T. Kajino, ISBN 978-9811963445 doi: https://doi.org/10.1007/978-981-15-8818-1_50-1 arXiv: http://arxiv.org/abs/2402.11759v1 Title: Charge-density wave transition in magnetic topological semimetal EuAl$_4$ Author: R. Yang, C. C. Le, P. Zhu, Z. W. Wang, T. Shang, Y. M. Dai, J. P. Hu, M. Dressel doi: https://doi.org/10.1103/PhysRevB.109.L041113 arXiv: http://arxiv.org/abs/2311.15834v1 Title: Resurgence in Lorentzian quantum cosmology: no-boundary saddles and resummation of quantum gravity corrections around tunneling saddles Author: Masazumi Honda, Hiroki Matsui, Kazumasa Okabayashi, Takahiro Terada arXiv: http://arxiv.org/abs/2402.09981v1
2024-02-19
受賞情報

杉田有治と株式会社理研数理が第6回日本オープンイノベーション大賞文部科学大臣賞を受賞

杉田有治（杉田理論分子科学研究室主任研究員／数理創造プログラム上級研究員）および、株式会社理研数理は、医薬基盤・健康・栄養研究所、株式会社JSOL、Quantum Simulation Technologies, Inc.と共に第6回日本オープンイノベーション大賞文部科学大臣賞を受賞しました。2月14日には、授賞式が内閣府中央合同庁舎にて執り行われました。おめでとうございます。なお、株式会社理研数理は、数理創造プログラム（iTHEMS）と株式会社JSOLの発案で設立され、「社会の基本的な問題解決に数理科学を最大限活用する企業」を目指しています。
2024-02-19
セミナーレポート

ABBL-iTHEMS Joint Astro Seminar by Yosuke Mizuno on February 8, 2024

On February 8th, Prof. Yosuke Mizuno (Shanghai Jiao Tong University) gave a talk about the numerical simulations of the jet launching process at the vicinity of black holes. Supermassive black holes hosted in active galaxies are known to launch relativistic jets and emit electromagnetic signals across a wide range of energy bands. A notable example is the nearby supermassive black hole hosted in the M87 galaxy. Recent results from the Event Horizon Telescope, which has provided a radio image of the vicinity of the black hole, have revealed a signature of curved space-time. In the talk, after giving a broad overview of this topic, he described the current understanding of the physics at the horizon scale of black holes based on his numerical simulations. He carried out 3D general relativistic magneto-hydrodynamical simulations and general relativistic radiative transfer calculations to investigate the jet launching process and the radiative signature at the horizon scale. He has shown that his calculations can successfully reproduce the results of the Event Horizon Telescope. At the same time, while it is robust that the curved space-time signature is present in the observation, uncertainty remains in the physical properties such as the spin of black hole and the degree of magnetization of the accretion flow. To further pin down these properties, higher quality observational data are required. Reported by Hirotaka Ito
2024-02-15
今週の論文
Week 3, February 2024

Title: The $ \textrm{\ensuremathφ-NN} $ Bound-State Problem by First Lattice QCD $ \textrm{N-\ensuremathφ} $ Potentials Author: Faisal Etminan, Amanullah Aalimi arXiv: http://arxiv.org/abs/2402.06914v1
2024-02-08
今週の論文
Week 2, February 2024

Title: Non-relativistic trace anomaly and equation of state in dense fermionic matter Author: Hiroyuki Tajima, Kei Iida, Haozhao Liang arXiv: http://arxiv.org/abs/2402.04960v1 Title: Evolutionary and ecological trends in the Neotropical cycad genus Dioon (Zamiaceae): An example of success of evolutionary stasis Author: José Said Gutiérrez-Ortega, Miguel Angel Pérez-Farrera, Mitsuhiko P. Sato, Ayumi Matsuo, Yoshihisa Suyama, Andrew P. Vovides, Francisco Molina-Freaner, Tadashi Kajita, Yasuyuki Watano Journal Reference: Ecological Research doi: https://doi.org/10.1111/1440-1703.12442
2024-02-02
受賞情報

小澤知己客員研究員が第6回晝馬輝夫光科学賞を受賞

小澤知己（数理創造プログラム客員研究員）が「第6回晝馬輝夫光科学賞」を「トポロジカル・フォトニクスにおける人工次元等の理論的提唱とその実証」の研究業績により受賞しました。贈呈式は3月5日に行われます。おめでとうございます。
2024-02-02
受賞情報

田中章詞上級研究員が日本物理学会第29回論文賞を受賞

田中章詞（上級研究員・兼務）が日本物理学会第29回論文賞を論文題目「Detection of Phase Transition via Convolutional Neural Networks」において受賞しました。おめでとうございます。
2024-02-02
お知らせ

Takemasa Miyoshi will give a talk at the RIKEN Science Lecture

A scientific lecture introducing RIKEN's research activities will be held on February 23 (Fri., national holiday) at the Miraikan Hall of the National Museum of Emerging Science and Innovation. Takemasa Miyoshi (Deputy Program Director, iTHEMS) is one of the speakers and will give a talk titled "Creating Guerrilla Rainstorms Inside Computers." For more information, please see the related links.
2024-02-01
今週の論文
Week 1, February 2024

Title: Search for heavy dark matter from dwarf spheroidal galaxies: leveraging cascades and subhalo models Author: Deheng Song, Nagisa Hiroshima, Kohta Murase arXiv: http://arxiv.org/abs/2401.15606v1 Title: Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433 Author: H.E.S.S. Collaboration (Naomi Tsuji) Journal Reference: Science383,402-406(2024) doi: https://doi.org/10.1126/science.adi2048 arXiv: http://arxiv.org/abs/2401.16019v1 Title: Interparticle normal force in highly porous granular matter during compression Author: Sota Arakawa, Misako Tatsuuma, Hidekazu Tanaka, Mikito Furuichi, Daisuke Nishiura arXiv: http://arxiv.org/abs/2401.14990v1 Title: The metamorphosis of the Type Ib SN 2019yvr: late-time interaction Author: Lucía Ferrari, Gastón Folatelli, Hanindyo Kuncarayakti, Maximilian Stritzinger, Keiichi Maeda, Melina Bersten, Lili M. Román Aguilar, M. Manuela Sáez, Luc Dessart, Peter Lundqvist, Paolo Mazzali, Takashi Nagao, Chris Ashall, Subhash Bose, Seán J. Brennan, Yongzhi Cai, Rasmus Handberg, Simon Holmbo, Emir Karamehmetoglu, Andrea Pastorello, Andrea Reguitti, Joseph Anderson, Ting-Wan Chen, Lluís Galbany, Mariusz Gromadzki, Claudia P. Gutiérrez, Cosimo Inserra, Erkki Kankare, Tomás E. Müller Bravo, Seppo Mattila, Matt Nicholl, Giuliano Pignata, Jesper Sollerman, Shubham Srivastav, David R. Young Journal Reference: MNRAS Letters, 529, L33 (2024) doi: https://doi.org/10.1093/mnrasl/slad195 arXiv: http://arxiv.org/abs/2401.15052v1 Title: Diagrammatic representations of 3-periodic entanglements Author: Toky Andriamanalina, Myfanwy E. Evans, Sonia Mahmoudi arXiv: http://arxiv.org/abs/2401.14254v1 Title: Doubly charmed tetraquark $T_{cc}^+$ in (2+1)-flavor QCD near physical point Author: Yan Lyu, Sinya Aoki, Takumi Doi, Tetsuo Hatsuda, Yoichi Ikeda, Jie Meng arXiv: http://arxiv.org/abs/2401.13917v1
2024-01-30
セミナーレポート

Quantum Computation SG Seminar by Emanuele Mendicelli on December 18, 2023

Dr. Emanuele Mendicelli presented his work on the study a SU(2) pure gauge lattice theory on a quantum annealer by D-Wave. Reported by Enrico Rinaldi
2024-01-30
ホットトピック

iTHEMSが孫正義育英財団生との交流会を開催しました

理化学研究所（理研）数理創造プログラム（以下、iTHEMS）は12月7日（木）に、将来を担う若手人材育成の一環で、孫正義育英財団生との交流イベントを初めて開催しました。数学や物理、生物、AI等に興味を持つ9歳から26歳までの財団生13名と、iTHEMS研究者10名が参加し、ハイレベルなディスカッションを繰り広げ、交流を深めました。詳細は、下記の本文をご覧下さい。
2024-01-30
ホットトピック

ワークショップ「開放量⼦系の数理による⽣物･認知･社会現象の理解」が2024年1月26日に開催されました

2024年1月26日（金）9:30 - 17:00に「開放量⼦系の数理による⽣物･認知･社会現象の理解」と題したワークショップをiTHEMS、RIKEN Quantum、JST-CREST「マルチセンシング」領域の共催により大河内記念ホール（及びZoomのハイブリッド形式）にて開催しました。冒頭、JST-CREST「マルチセンシング」領域の研究総括である入來篤史氏（理研）から本ワークショップの趣旨説明が行われ、引き続き初田哲男氏（理研）からRIKEN Quantumで利用可能な各種量子コンピュータなどについての紹介がありました。その後、⻄郷甲矢人氏（⻑浜バイオ大）から「JST-CREST 課題を中⼼に Open Quantum System 全体の概観を解説」と題した講演があり、量⼦論的数理を⽤いた⼀般現象のモデリング・解釈の可能性と期待について討論が行われました。引き続き小澤正直氏（中部大）からは「⾮可換な順序効果の理論とブレークスルーにおける新しい数学理論」について講演があり、実験家と数学者との相補的共働のデザインと「新しい数学」の創造について討論が行われました。昼休みを挟み、磯村拓哉氏（理研）から「ベイズ推論変分⾃由エネルギー原理における経路積分的⼿法」について講演があり、⽣物学・脳神経科学・認知科学と精神医学における量⼦論的解釈について討論が行われました。引き続き⽥中彰吾氏（東海大）からは「原⼦論的⼈間観から量⼦メタファーによる⼈間と社会の理解へ」と題した講演があり、⼈⽂社会科学における量⼦的現象と量⼦計算の社会実装の可能性について討論が行われました。最後には「⼈間現象」の進化／歴史の経路積分･量⼦論的解釈と”Quantum-Like Modeling”について総合討論が行われました。現地及びオンライン合わせて約70名の参加者があり、人文社会科学分野における諸現象の量子論的解釈や量子計算の可能性について意欲的な討論が行われました。
2024-01-26
ホットトピック

Seoul National University student group visited iTHEMS on January 10, 2024

1月10日（水）、ソウル大学（SNU）の学生グループ「GLEAP」の一行22名が、同大学生物科学部自然科学科のJi-Young Lee副学部長に引率され、iTHEMSを訪問しました。メンバーは学部2年生から4年生まで、数学、化学、生物学、物理学、統計学など幅広い分野の学生でした。iTHEMSへの訪問は、将来の進路や研究の方向性を検討するため、数日間にわたり日本の様々な大学や研究機関を訪問するツアーの一環です。理研に到着した一行は、iTHEMSのメンバーである金東昱とカトゥリン・ボシゥメンの出迎えを受け、まず仁科センターのイオンビーム加速器を見学しました。次に、iTHEMSのコモンルームで軽食をとりながら、ごく短時間のカジュアルな会話を楽しみました。カトゥリン・ボシゥメンは、SNUの学生が将来iTHEMSのメンバーになるための様々な機会（JRA、IPA、SPDR、RS/SRSなど）について5分間紹介しました。さらに、6名のiTHEMS研究者（金東昱、辰馬未沙子、田中章詞、カトゥリン・ボシゥメン、シュテッフェン・バッケス、難波亮）がそれぞれの研究について12分間の講演を行いました。その後、数名のiTHEMSメンバーも加わり、学生とiTHEMSメンバーがそれぞれ簡単に自己紹介と研究テーマについて話し、軽食を食べながら、iTHEMSのメンバーとSNUの学生との間で興味深いカジュアルなディスカッションが続きました。学生たちは、iTHEMSを訪問し、iTHEMSのメンバーが行っている幅広い研究について学ぶことができ、とても楽しかったと話してくれました。全体として、将来のアカデミックキャリアを考えている若い研究者にiTHEMSメンバーの研究を紹介する素晴らしい機会となりました。 iTHEMSのアシスタントの皆さん、時間を割いてこのイベントに参加し、学生にとって興味深いものにしてくれたiTHEMSの研究者の皆さん、そして特に、SNUの卒業生である金東昱に感謝します。 Reported by Catherine Beauchemin
2024-01-25
今週の論文
Week 4, January 2024

Title: Toward QCD on Quantum Computer: Orbifold Lattice Approach Author: Georg Bergner, Masanori Hanada, Enrico Rinaldi, Andreas Schafer arXiv: http://arxiv.org/abs/2401.12045v1 Title: Multipole and fracton topological order via gauging foliated SPT phases Author: Hiromi Ebisu, Masazumi Honda, Taiichi Nakanishi arXiv: http://arxiv.org/abs/2401.10677v1 Title: Computations of HOMFLY homology Author: Keita Nakagane, Taketo Sano arXiv: http://arxiv.org/abs/2111.00388v2
2024-01-22
ホットトピック

2024年1月12日-14日にアートイベントDIG SHIBUYAでBlack Hole Recorderが展示されました

iTHEMSは、外部クリエイターと2021年に制作した、量子ブラックホール理論に基づくサイエンスアート作品「Black Hole Recorder」を、アートイベント“DIG SHIBUYA”内のプログラムとして、1月12日(金)から14日(日)の3日間、渋谷区立勤労福祉会館にて展示しました。全体のイベントはSHIBUYA CREATIVE TECH実行委員会が渋谷区と共催で開催したもので、「Black Hole Recorder」は連携プロジェクトとして公募で採択されました。展示は部屋を暗い空間にして、まん中に「Black Hole Recorder」を設置し、お客さんを懐中電灯で足元を照らしながら入場いただいて、説明と共に作品を鑑賞いただきました。会場全体が実験空間であり、「Black Hole Recorder」により会場の音は常に全て記録されています。また今回はじめて、過去に「Black Hole Recorder」が展示された実験空間そのものを環境音として記録したデータを聞いていただくブースを設けて、過去の空間に耳を傾ける体験も楽しんでいただきました。多くの人が集まる渋谷という街中にある施設での開催ということで休みの日は多くのお客さんに鑑賞・体験いただくことができました。時間帯によっては場内がかなり混み合うこともありました。アート作品を通じることで、ブラックホールそしてその理論を知って関心をもっていただき、多くの来場者(のべ300名近く)にブラックホールというものをイメージして帰っていただけたと思います。研究者の横倉祐貴研究員や初田哲男プログラムディレクターによる黒板を使った詳細な理論の説明も好評でした。人類の音をはるか未来に届けるべく、将来的には記録された音をブラックホールに電波で送る計画に関しても、時間とスケール感から反応がよかったです。街中でのアートイベントへの出展は、サイエンスに普段はあまり関心がない方々にも研究成果を届ける機会となり、今後の進展への手応えを感じるものとなりました。
2024-01-18
今週の論文
Week 3, January 2024

Title: Double-graviton production from Standard Model plasma Author: J. Ghiglieri, M. Laine, J. Schütte-Engel, E. Speranza arXiv: http://arxiv.org/abs/2401.08766v1 Title: General corner charge formulas in various tetrahedral and cubic space groups Author: Hidetoshi Wada, Katsuaki Naito, Seishiro Ono, Ken Shiozaki, Shuichi Murakami arXiv: http://arxiv.org/abs/2311.15761v1 Title: Three ways of calculating mass spectra for the 2-flavor Schwinger model in the Hamiltonian formalism Author: Akira Matsumoto, Etsuko Itou, Yuya Tanizaki arXiv: http://arxiv.org/abs/2401.07556v1 Title: Predicting heteropolymer interactions: demixing and hypermixing of disordered protein sequences Author: Kyosuke Adachi, Kyogo Kawaguchi arXiv: http://arxiv.org/abs/2401.07826v1 Title: Shear oscillations in neutron stars and the nuclear symmetry energy Author: Hajime Sotani arXiv: http://arxiv.org/abs/2401.08382v1 Title: Upper Limit on the Coronal Cosmic Ray Energy Budget in Seyfert Galaxies Author: Yoshiyuki Inoue, Shinsuke Takasao, Dmitry Khangulyan arXiv: http://arxiv.org/abs/2401.07580v1 Title: Determination of the CP restoration temperature at $θ=π$ in 4D SU(2) Yang-Mills theory through simulations at imaginary $θ$ Author: Mitsuaki Hirasawa, Kohta Hatakeyama, Masazumi Honda, Akira Matsumoto, Jun Nishimura, Atis Yosprakob arXiv: http://arxiv.org/abs/2401.05726v1
2024-01-17
今週の注目人物

Self-introduction: Camilia Demidem

My field of research is high-energy astrophysics. The fundamental open questions that motivate my work are that of the origins of high-energy cosmic rays and the nature of the physical processes dissipating energy in extreme astrophysical environments such as active galactic nuclei, gamma ray bursts or pulsar wind nebulae. More specifically, I investigate the multi-scale physics of shocks, turbulence and particle acceleration possibly at play in these environments using theoretical modelling and different numerical frameworks, including particle-in-cell and magnetohydrodynamic simulations. I am excited to join a group of scientists from such diverse backgrounds and I am particularly looking forward to working alongside researchers in the fields of health and biology for the first time! I am also eager to improve my Japanese, よかったら、日本語で声を掛けてください！
2024-01-11
今週の論文
Week 2, January 2024

Title: Correlations and Distinguishability Challenges in Supernova Models: Insights from Future Neutrino Detectors Author: Maria Manuela Saez, Ermal Rrapaj, Akira Harada, Shigehiro Nagataki, Yong-Zhong Qian arXiv: http://arxiv.org/abs/2401.02531v2
2024-01-04
セミナーレポート

iTHEMS Math Seminar by Yuto Yamamoto on December 13, 2023

There was a math seminar by Yuto Yamamoto. He explained what is a tropical geometry first. He then explained the periodic integral and his recent results. Reported by Keita Mikami
2024-01-04
今週の論文
Week 1, January 2024

Title: Expansion of a digraph with a doubly bidirectionally connected pair is not cactus Author: Hiroki Kodama arXiv: http://arxiv.org/abs/2312.17327v1 Title: Mass spectrum of spin-one hadrons in dense two-color QCD: Novel predictions by extended linear sigma model Author: Daiki Suenaga, Kotaro Murakami, Etsuko Itou, Kei Iida arXiv: http://arxiv.org/abs/2312.17017v1

49件のニュース / 2024年