Featured News
Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) is an international research program at RIKEN. It facilitates close collaborations among researchers from different disciplines in theoretical, mathematical and computational sciences. The ultimate goal of iTHEMS is to unravel the mystery of the Universe, matter, and life, as well as to solve key problems in modern society through interdisciplinary approaches.
Upcoming Events
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Seminar
Breaking down the magnonic Wiedemann-Franz law in the hydrodynamic regime
December 4 (Mon) at 15:00 - 16:30, 2023
Ryotaro Sano (Ph.D. Student, Division of Physics and Astronomy, Graduate School of Science, Kyoto University)
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Seminar
Gravity of Accretion Discs and Black Holes
December 5 (Tue) at 14:00 - 15:00, 2023
Petr Kotlařík (Ph.D. Student, Institute of Theoretical Physics, Charles University, Czechia)
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Seminar
Rotating discs on the Kerr black hole background
December 5 (Tue) at 15:00 - 16:30, 2023
David Kofroň (Postdoctoral Researcher, Institute of Theoretical Physics, Charles University, Czechia)
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Seminar
Translating between evolutionary game theory and theoretical ecology
December 5 (Tue) at 16:30 - 17:30, 2023
Arne Traulsen (Director, Department for Theoretical Biology, Max Planck Institute for Evolutionary Biology, Germany)
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Seminar
Cosection localization via shifted symplectic geometry
December 6 (Wed) at 10:00 - 11:30, 2023
Young-Hoon Kiem (Professor, School of Mathematics, Korea Institute for Advanced Study (KIAS), Republic of Korea)
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Seminar
Gravitational Lensing in Black Hole Spacetimes of the Plebanski-Demianski Class
December 6 (Wed) at 16:00 - 17:30, 2023
Torben Christian Frost (Postdoctoral Researcher, Kavli Institute for Astronomy and Astrophysics, Peking University, China)
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Seminar
Exploring material strengths of dust aggregates in planet formation by numerical simulations
December 8 (Fri) at 14:00 - 15:15, 2023
Misako Tatsuuma (Research Scientist, iTHEMS)
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Lecture
Transforming Industries and Society: The Power of Advanced Math and AI Technologies
December 12 (Tue) at 16:30 - 18:00, 2023
Hirokazu Anai (Principal Research Director, FUJITSU RESEARCH, FUJITSU LED)
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Lecture
Rapid development of cold-atom quantum computers and their prospect
December 26 (Tue) at 13:30 - 17:00, 2023
Takafumi Tomita (Assistant Professor, Photo-Molecular Science, Institute for Molecular Science)
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Seminar
Probing structure of neutron stars through X-ray bursters
January 12 (Fri) at 14:00 - 15:15, 2024
Akira Dohi (Special Postdoctoral Researcher, Astrophysical Big Bang Laboratory, RIKEN Cluster for Pioneering Research (CPR))
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Workshop
Second Workshop on Fundamentals in Density Functional Theory (DFT2024)
February 20 (Tue) - 22 (Thu), 2024
Opportunities
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Seeking Research Scientists or Senior Research Scientists (W23178)
Deadline: Open until filled
Research Scientist or Senior Research Scientist, a few positions. iTHEMS is seeking research scientist(s) or senior research scientist(s) as part of its "Mathematical Sciences and Medicine" initiative.
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Seeking Research Scientists or Senior Research Scientists (W23149)
Deadline: December 8, 2023
Research Scientist or Senior Research Scientist, a few positions. iTHEMS is seeking research scientist(s) or senior research scientist(s) in mathematical sciences including pure mathematics, applied and industrial mathematics.
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Seeking Postdoctoral Researcher, Research Scientist and Senior Research Scientist (W23143)
Deadline: Open until filled
Postdoctoral Researcher, Research Scientist or Senior Research Scientist, about 10 positions. This call is open to researchers in any field who wish to participate in RIKEN Quantum.
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Seeking a few Postdoctoral Researchers (RIKEN-Berkeley Fellow associated with N3AS) (W22284)
Deadline: Open until filled
Postdoctoral Researcher (RIKEN-Berkeley Fellow associated with N3AS), a few positions. Theoretical works associated with neutrino physics, nucleosynthesis, dense matter and neutron stars, dark matter, astrophysical simulations, lattice QCD simulations and related fields. Successful applicants will work and spend the first three months at the RIKEN Wako campus, and the remainder of the years at the RIKEN Berkeley Center at the University of California, Berkeley on a long term business trip. The appointments of the RIKEN Berkeley Fellow are made through RIKEN iTHEMS.
Latest News
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2023-11-26
Seminar ReportABBL-iTHEMS Joint Astro Seminar by Derek Beattie Inman on November 24, 2023
Cosmological observations have led to an extremely precise understanding of the large-scale structure of the Universe. A common assumption is to extrapolate large-scale properties to smaller scales; however, whether this is correct or not is unknown and many well-motivated early Universe scenarios predict substantially different structure formation histories. In this seminar Derek discussed two scenarios where nonlinear structures form much earlier than is typically assumed. In the first case, the initial fluctuations are enhanced on small scales leading to either primordial black holes clusters or WIMP minihalos right after matter-radiation equality. In the second, Derek showed that an additional attractive dark force leads to structure formation even in the radiation dominated Universe. Derek furthermore discussed possible observations of such early structure formation including changes to the cosmic microwave background, dark matter annihilation, and when the first galaxies form. Reported by Shigehiro Nagataki
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2023-11-23
Paper of the WeekWeek 4, November 2023
Title: A Kohn-Sham Scheme Based Neural Network for Nuclear Systems Author: Zu-Xing Yang, Xiao-Hua Fan, Zhi-Pan Li, Haozhao Liang Journal Reference: Phys. Lett. B 840, 137870 (2023) doi: https://doi.org/10.1016/j.physletb.2023.137870 arXiv: http://arxiv.org/abs/2212.02093v2 Title: A threshold-type algorithm to the gradient flow of the Canham-Helfrich functional Author: Katsuyuki Ishi, Yoshihito Kohsaka, Nobuhito Miyake, Koya Sakakibara arXiv: http://arxiv.org/abs/2311.13155v1 Title: Magnonic spin current shot noise in an itinerant Fermi gas Author: Tingyu Zhang, Hiroyuki Tajima, Haozhao Liang arXiv: http://arxiv.org/abs/2311.12383v1 Title: Quantum Simulation of Finite Temperature Schwinger Model via Quantum Imaginary Time Evolution Author: Juan W. Pedersen, Etsuko Itou, Rong-Yang Sun, Seiji Yunoki arXiv: http://arxiv.org/abs/2311.11616v1 Title: First-order bulk transitions in large-$N$ lattice Yang--Mills theories using the density of states Author: Felix Springer, David Schaich, Enrico Rinaldi arXiv: http://arxiv.org/abs/2311.10243v1 Title: Sexual antagonism in sequential hermaphrodites Author: Thomas Hitchcock, Andy Gardner Journal Reference: Proc. R. Soc. B 290: 20232222 doi: https://doi.org/10.1098/rspb.2023.2222
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2023-11-16
Person of the WeekSelf-introduction: Dongwook Ghim
I am a theoretical physicist working on high-energy physics, HEP-TH. More precisely, I am interested in the spectral problems of strongly coupled gauge theory. The infamous quark confinement of Quantum Chromodynamics and the mass gap generation of Yang-Mills theory are the most well-known spectral problems involving strongly coupled gauge theory. I mainly use two orthogonal toolkits to tackle such problems; supersymmetry and quantum simulation. I have worked on the computation of the twisted partition function of supersymmetric gauge theories, which appear in the string theory context, showing a strong relation with the geometry of Calabi-Yau manifolds. Simultaneously, I am eager to develop a quantum algorithm that can capture the spectra of gauge theories, without the aid of supersymmetry. The latter targets low-dimensional lattice gauge theory in practice. But I dream of capturing the physics of three- or four-dimensional gauge theory on the quantum processor near future. I look forward to a fruitful collaboration with people in iTHEMS, RIKEN.