Seminar Report
369 news
-
2019-07-04
Seminar Report
Math seminar by Hiroki Kodama
Hiroki Kodama had a seminar talk in the iTHEMS math seminar on 20 June. The topic was the foundation of metric space and its generalizations. Metric space is one of the most primitive setting of geometry. This notion is defined in an abstract way by metric function satisfying 3 axioms. Not only the Euclidean metric, which is familiar for all of us, many ideas arising all over the science (e.g. the distance of two DNAs) are formulated as a kind of metric. A main interest of this seminar was a generalization of metric space, which is less popular even for mathematicians. A function satisfying the axioms of metric space except for the symmetry axiom d(x,y)=d(y,x) is called an asymmetric metric (a typical example is the cost for a ship on a river to move from one point to another). In the first half of the talk, Kodama introduced the basic notion of (asymmetric) metric spaces with various examples. In the second half, he introduced an interest of asymmetric metric space by showing rich information it includes.
-
2019-06-20
Seminar Report
Seminar by Dr. Allard van Marle from UNIST in Shouth Korea
Dr. Allard Jan van Marle visited ABBL and iTHEMS this week from his home institute of UNIST in South Korea. On Monday, June 17, he gave a seminar about his work in astrophysics, on particle acceleration and particle-shock interactions. This is a very difficult topic to study because of the very different scales (length, time, and energy) involved. Low-energy electrons and ions create the magnetic field turbulence that lets particle acceleration take place, so numerical simulations should resolve their motion. But accelerated particles have energies orders of magnitude higher, which means the numerical grid must be much larger to track them. Dr. van Marle presented a new numerical method that partially resolves this tension. This "particle in [MHD] cell" code averages out the majority of the low-energy electrons/ions, freeing up computational resources to track the higher-energy particles that are of more interest to most astrophysicists. Shock fronts are everywhere in the universe, but they come in a large variety of speeds, sizes, and locations. The work presented by Dr. van Marle will help to determine how (or if) all of these different shocks behave as natural particle accelerators.
-
2019-06-13
Seminar Report
Seminar by RIKEN researcher, Dr. Nathan Shammah
RIKEN researcher Nathan Shammah gave the first seminar for the QuCoIn (Quantum Computing and Information Science) working group. On June 13, he hosted an interactive workshop on open-source software and the Quantum Toolbox in Python (QuTiP) library. Open-source software, which allows anyone to see its source code, is becoming popular in business, in science, and among the general public: even tech giants like Microsoft and Google are investing in open-source projects. Python, in particular, is a highly-developed ecosystem with many packages, and one that most of you are probably already familiar with. The QuTiP code is one such package, which lets you simulate quantum systems, and even quantum circuits, on your (non-quantum) computer. About twenty people attended Nathan’s workshop and started learning to use QuTiP. We hope that this experience, and the new tool kit, will help people to accelerate their research and advance the field. If you have questions about QuTiP, please ask Nathan—he is very happy to discuss the software! And if you are interested in quantum tech research highlights, you can subscribe to Nathan's monthly newsletter on quantum technologies from the link below.
-
2019-06-07
Seminar Report
Seminar by Professor Yasunori Nomura from Berkeley
Prof. Yasunori Nomura from Berkeley Center for Theoretical Physics, for which Prof. Nomura serves as the director, gave a seminar entitled " Quantum Mechanics of an Evaporating Black Hole" on June 6th. In his talk, he elucidated the so-called information paradox of evaporating black holes and plainly presented his resolution of this long-standing paradox. We are particularly pleased that we could invite Prof. Nomura not long after Coordinator Tada's own seminar at Berkeley. Frequent mutual visit between Berkeley and RIKEN would be most beneficial to iTHEMS, so we encourage all the iTHEMS members to find an opportunity to visit Berkeley, or invite somebody from there.
-
2019-05-23
Seminar Report
Report of iTHEMS Special Lecture – How did the Universe Begin? -Inflation Theory & Road to the Proof-
On May 21st, iTHEMS Special Lecture by Dr. Katsuhiko Sato (Professor Emeritus, The University of Tokyo / Director, Research Center for Science Systems, Japan Society for the Promotion of Science) was given at Okochi Hall for more than 100 participants. Dr. Katsuhiko Sato is well known as a scientist who discovered the inflation mechanism of the early Universe in 1981. In the special lecture, Dr. Katsuhiko Sato gave an introduction about the expansion of the universe, mysteries about uniformity & isotropy of the universe, and absense of monopoles. Then Dr. Katsuhiko Sato explained how he got an idea of the inflation mechanism, motivated by Spontaneous-Symmetry-Breaking (SSB) mechanism (SSB was proposed by Dr. Yoichiro Nambu), and explained how these problems are solved by the Inflation mechanism. Dr. Katsuhiko Sato introduced about future missions that will prove firmly the inflation mechanism, including LiteBIRD that will measure B-mode in the polarization of cosmic microwave background in the universe. It was a great coincidence that JAXA announced on the same day, May 21st, that JAXA has made a decision to launch LiteBIRD. We wish the Inflation mechanism proposed by Dr. Katsuhiko Sato will be proved firmly in the near future.
-
2019-05-16
Seminar Report
Dr. Shunji Matsuura from 1QBit gave a series of lectures
Our visitor Dr. Shunji Matsuura from 1QBit, a startup company specializes in quantum computing and quantum information technology based in Vancouver, Canada gave a series of lectures from May 13 (Mon) through May 15 (Wed). Dr. Matsuura started with a basic explanation of qubits and their entanglement. Then, he moved on to explain various method employed in the field of quantum computing, such as Variational Quantum Eigensolver (VQE). His explanation was especially clear to physicists, since Dr. Matsuura’s background is string theory receiving his Ph.D. in string theory from the Perimeter Institute for Theoretical Physics and the University of Tokyo, and he used to conduct research at the Kavli Institute for Theoretical Physics (University of California, Santa Barbara), McGill University, Riken, YITP (Kyoto University), and the Niels Bohr Institute (University of Copenhagen). His current research focuses on the fundamental aspects of quantum-enhanced optimization, such as error correction and speedup, which are also of interest to some iTHEMS members, and we are hoping a lot of fruitful collaborations between iTHEMS and Dr. Matsuura as well as 1QBit group in future.
-
2019-05-09
Seminar Report
Report of iTHEMS colloquium - Quantum computing: current status and prospects
On April 25th, iTHEMS Colloquium featured Prof. Keisuke Fujii from Osaka University. Prof. Fujii has just moved to Osaka and started his laboratory for Quantum computing. Started with quoting Richard Feynman and went on to summarize the history of quantum computing. Then he gave a pedagogical explanation of the principle of quantum computing and the overview of the subject. Next, among over three hundred papers at Quantum Algorithm Zoo, he singled out Quantum Phase estimation as the most important Algorithm. Prof. Fujii explained the algorithm and told the audience that it has application to Prime factorization, Quantum Chemistry and Quantum simulation as well as Quantum linger system solver, which has relevance to AI. He then gave the assessment of the current status of quantum computing and future prospect. The lecture was concluded by the exposition of Quantum-classical hybrid algorithm and its application to machine learning. Because of the exciting topic featured, the lecture attracted many keen audience.
-
2019-04-25
Seminar Report
iTHEMS public lectures at RIKEN Open Day
iTHEMS public lectures at the RIKEN open day on April 20, 2019, were held with an extreme success. The lectures are (1) Surprising Theorem of Gauss (Y. Kubota), (2) Mystery of Circadian Rhythm (G. Kurosawa), (3) Mechanism of Artificial Intelligence (M. Taki), (4) Coldest Place in the Universe (T. Ozawa), (5) What is Dark Matter ? (N. Hiroshima), (6) Evolution through Copy and Paste of DNA (J. Fawcett). Thank you all who have contributed to make this happen!
-
2019-04-24
Seminar Report
Report on ZetaValue2019 Conference by Chacha (Dr. Ade Irma Suriajaya)
The conference "Value Distribution of Zeta and L-functions and Related Topics" has successfully ended on March 27, 2019. The whole conference program started with a colloquium, ZetaValue2019-iTHEMS Special Mathematics Colloquium, on March 21, followed by the main conference held from March 22 to 26, and concluded with a one day workshop on March 27. We had more than 120 participants in total, among we had over 100 number theorists and overall about 111 mathematicians. We managed to gather people from over 20 different countries, and more precisely there were 50 participants coming from overseas from 40 different institutions. Number theorists from over 30 different institutions in Japan also took part in the conference. As far as we, the organizers, know, this is very rare achievement for a math conference in Japan; at least in analytic number theory field, this was the first ever conference in Japan to gather this many people coming from various places. We had 2 invited colloquium talks, 14 invited plenary talks, 9 contributed short talks, 15 contributed poster talks (excluding mine), and 9 contributed workshop talks. I would like to thank iTHEMS members and a few other RIKEN scientists who attended the colloquium. I hope that the talks were interesting enough and I really hope to maintain this communication and even boost our interdisciplinary connection further. Finally, the most important thing I would like to address here is: I deeply thank iTHEMS, and further, RIKEN who supported and assisted this conference, who made all of this possible. Thank you very much!! To all the assistants who helped me a lot from the preparation until the concluding process, please accept my sincere gratitude.
-
2019-03-01
Seminar Report
Report of iTHEMS colloquium - Tropical Rain Forest
iTHEMS Colloquium was held on February 21st, inviting Dr. Akiko Satake, Professor of Kyushu University. Her lecture was entitled “Tropical Rain Forest.” In forests, flowering and fruit production are synchronized between different trees with irregular intervals of several years. Dr. Satake integrated long-term data and mathematical modeling, and found the triggers for mass flowering are temperature and drought. In fact, by using her model and the data of temperature and precipitation, she accurately predicted the mass flowering timing. This study will reveal the link between macroscopic (ecosystem) and microscopic (gene regulatory system) phenomena. Because the research topic is interesting and her presentation was easy for non-specialist to understand, we enjoyed active discussion.
-
2018-11-27
Seminar Report
iTHEMS Public Lectures at RIKEN Kobe Campus Open House
On Nov. 28, 2018, the annual open campus of RIKEN Kobe was held. From this year, iTHEMS, which has a Kobe office (SUURI-COOL Kobe), joins this event and organized public lectures "Hot topics in Mathematical Sciences". This year 's program was Tetsuo Hatsuda "The world that mathematical sciences open" Ade Irma Suriajaya "How can something infinite become finite?" Jeffrey Fawcett "What are genomes? - Toward decoding the language of life - " Masato Taki and Noriaki Ogawa "Artificial intelligence and its medical application" Shigenori Otsuka and Shunji Kotsuki "Frontiers in weather forecast research" The lectures were held in the auditorium at the 8th floor of the Kobe IIB building (iTHEMS office is in the 7th floor). Each speaker gave a 30-40 min. talk followed by lots of interesting questions from the audience. It was amazing to see that iTHEMS researchers are not only extraordinary in their own research but also super science communicators !
-
2018-10-04
Seminar Report
iTHEMS colloquium held on October 3rd
Prof. Hideaki Aoyama from Kyoto University was the lecturer of the latest iTHEMS colloquium held on October 3rd. Prof. Aoyama has just joined iTHEMS as a senior visiting researcher. Welcome to iTHEMS, Prof. Aoyama! The colloquium was entitled "Economic Networks: a Physicist's View. " In the opening of the talk, Prof. Aoyama shared his personal recollection of Richard Feynman, one of the greatest physicists of the last century, and quoted his words. He went on to explain the techniques developed to explore the correlations and hidden relations buried in the huge amount of complex data which concern the economic activities of the real world. He pointed out that a certain kind of similarities can be observed between physics and economics, for example, the time correlation of the aftershocks of earthquakes and the bankruptcies occurred after calamities. The colloquium attracted a wide range of audience including those from outside RIKEN.
-
2018-07-23
Seminar Report
iTHEMS-CEMS Joint Colloquium was held on July 19
iTHEMS-CEMS Joint Colloquium was held on July 19 at Okochi hall with a distinguished speaker, Prof. A. J. Leggett (Univ. Illinois at Urbana-Champaign). The hall was packed with full of audience (more than 150 participants) to listen the talk by the world's leading theorist in quantum physics. Prof. Leggett started his lecture with elementary considerations on classical radiation. Then he moves on to describe two photons emitted back-to-back in atomic transition and subsequent observation of the photon polarizations. In the "objective local theory" in which (i) local causality, (ii) induction and (iii) microscopic realism are assumed, one can prove an inequality for certain correlation measurement (Bell's theorem). Since quantum mechanics violates the inequality, the natural consequence is that (iii) is not satisfied in quantum mechanics. The key idea behind is the "entanglement" in which information is stored in non-local manner in quantum mechanics. Then, he talked about the notions of quantum teleportation, quantum cryptography and quantum computer where entanglement plays the essential role. The audience listened his lecture attentively and was fascinated by the interesting aspect of quantum mechanics and its applications.
-
2018-07-17
Seminar Report
Series of lectures at Komaba Campus, Univ. of Tokyo
Series of lectures "Frontiers of Mathematical Sciences: Universe, Matter, Life and Information" were at Komaba Campus, Univ. of Tokyo, on every Wed. April-July, 2018, for the 1st and 2nd year undergraduate students in Univ. Tokyo. Six researchers from RIKEN iTHEMS (Y. Inoue, Y. Yokokura, M. Tachikawa, J. Fawcett, T. Doi and M. Taki) gave 14 lectures altogether. The photo is the very last slide of M. Taki and himself (left) who gave the last lecture on July 11, as well as T. Tsuboi who organized this class. Undergraduate students seem to enjoy these lectures which cover the wide range of topics selected from the point of view of mathematical sciences. We plan to publish these lectures as a book in the near future.
-
2018-07-02
Seminar Report
Joint innovation seminar between RIKEN iTHEMS and Denso IT lab. was held on June 28
On June 28, joint innovation seminar between RIKEN iTHEMS and Denso IT lab. was held. After the general introduction to the Denso IT lab. There were two talks from Denso IT lab. (Human-car interface; Machine leaning and computer vision) and two talks from RIKEN iTHEMS (Topology in classical systems; Hadrons in quantum chromodynamics). It turned out that the background of all 4 speakers are theoretical physics. The iTHEMS coffee room was filled with people from both labs. and lively discussions among participants continued until 8pm. This meeting would be a model case where "real" interactions between researchers in academia and industry are made possible.
-
2018-06-29
Seminar Report
Prof. Satoshi Aoki's one day lecture was held on June 26
On June 26, Professor Satoshi Aoki (Kobe Univ.) gave a series of lectures about "computational algebraic statistics and its applications". His lecture is about application of the Grobner basis to statistic theory. Lecture 1 was an introduction to ideal of polynomial rings and its relation to the Grobner basis. In Lecture 2, he explained Grobner basis in design of experiments. In Lecture 3, he explained Grobner basis in statistical hypothesis with contingency tables. There were more than 30 participants from inside and outside of RIKEN. Background of the participants are mathematics, statistics, physics, biology, information science and medical science. There were many questions from the participants on the mathematical and practical aspects of the Grobner basis, and the lively discussions continued at the time of lunch and coffee break. This lecture turns out to be a model case of having both mathematicians and practitioners together to discuss the power of mathematics and it applications.
-
2018-06-11
Seminar Report
iTHEMS Colloquium was held on June 7
Prof. Yasumasa Nishiura gave a lecture at iTHEMS Colloquium which was taken place June 7th. His lecture was entitled "On the interplay between intrinsic and extrinsic instabilities of spatially localized patterns" and various patterns emerge from rather simple sets of differential equations were introduced. According to the lecture, spatially localized dissipative structures are observed in various fields, such as neural signaling, chemical reactions, discharge patterns, granular materials, vegetated landscapes, binary convection and block copolymer nanoparticles. Now, while these patterns are much simpler than single living cells, yet they seem to inherit several characteristic "living state" features, such as generation of new patterns, self-replication, switching to new dynamics via collisions and adaptive morphological changes to environments. Prof. Nishiura explained that these behaviors stem from an interplay between the intrinsic instability of each localized pattern and the strength of external signals. The global geometric interrelation amongst all relevant solution branches of a corresponding system with approximate unfolding parameters was explored. He argued that a global geometric structure formed by all relevant solution branches gives us much more insight rather than conventional PDE approaches. The theme of the lecture was most pertinent to iTHEMS colloquium and the audience was fascinated by the power of the mathematical insight applied to varied subjects and phenomena.
-
2018-05-21
Seminar Report
Catherine Beauchemin gave a short talk at Nerd Nite Tokyo on May 11
On Friday, May 11, Catherine Beauchemin gave a short talk at Nerd Nite Tokyo. She told the public that health science has serious issues with reproducibility of experiment results, and that the research culture incentivizes positive results rather than sound experiments. This is why you get reports in successive months about how eggs are unhealthy, then healthy. Or how a medical practice used for 20 years to reduce post-surgery infections actually makes them more likely. According to Catherine, if doctors and health scientists want to be trusted more, they need to better communicate the uncertainty of results, do fewer (but larger) experiments to produce more robust results, and accept that negative results are just as worthy of publication as positive results. She also talked about how health science has math problems. Too many people in that field don't understand math/statistics well, and blindly trust equations even when those equations are misapplied and give incorrect results. There is a big opportunity for scientists with a background in math to work with health scientists and improve the quality of research in a field that is important for everyone. She is already starting a project along these lines -- please join her to promote the goals of iTHEMS and health sciences! And if you want to speak at a future Nerd Nite about your own research, please contact Don Warren (donald.warren@riken.jp) for information.
-
2018-05-07
Seminar Report
iTHEMS Colloquium was held on April 23
iTHEMS Colloquium was held on April 23rd, inviting Dr. Kazuhiro Sakurada, Deputy Program Director of RIKEN Medical Sciences Innovation Hub Program, also at Sony CSL, and Dr. Jun Seita, Unit Leader of AI based Healthcare and Medical Data Analysis Standardization Unit, RIKEN Medical Sciences Innovation Hub Program as the lecturers. Dr. Sakurada gave the lecture first, entitled "The Description of biological phenomena as open system." There, he explained his approach to describe the life-course changes of individual people by applying the discretization model and Markov chain model. Then followed Dr. Seita’s lecture, which is entitled "Every Biological Variable has a Different Dynamic-range." He introduced an open platform for objective gene expression profiling named Gene Expression Commons. Their lectures exhibited the power of the interdisciplinary research in the most perspicuous way.
369 news