Seminar

Quantum Matter Seminar

Bethe ansatz and quantum computing

January 26 at 22:00 - 23:15, 2022

Prof. Rafael I. Nepomechie (Professor, Physics Department, University of Miami, Florida, USA)

We begin with a brief review of the Heisenberg quantum spin chain and its remarkable solution found by Bethe. We then review a probabilistic algorithm for preparing exact eigenstates of this model on a quantum computer. An exact formula for the success probability is presented, and the computation of correlation functions is discussed. A generalization of the algorithm to open chains with boundaries is also noted.

Venue: via Zoom

Event Official Language: English

Seminar

iTHEMS Biology Seminar

On Flow and Form at Low Reynolds Number

January 27 at 10:00 - 11:00, 2022

Prof. Kenta Ishimoto (Associate Professor, Research Institute for Mathematical Sciences (RIMS), Kyoto University)

Cell locomotion is mechanically restricted by surrounding viscous fluids. With a focus on swimming cells in a low-Reynolds-number flow, I will give a brief introduction to microbiological fluid dynamics and present a 'hydrodynamic shape' theory at the cellular scale.

Venue: via Zoom

Event Official Language: English

Seminar

iTHEMS Math Seminar

Recent progress on dualities in W-superalgebras

January 28 at 16:00 - 18:00, 2022

Dr. Shigenori Nakatsuka (JSPS Fellow, Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo)

Vertex superalgebras are algebras which describe the chiral part of two dimensional superconformal field theory. A rich and fundamental class is provided by the affine vertex superalgebras associated with simple Lie superalgebras and the W-superalgebras obtained from them by cohomology parametrized by nilpotent orbits. Historically, the W-algebras associated with simple Lie algebras and principal nilpotent orbit have been studied intensively and are well-known to play an essential role in the quantum geometric Langlands program. In particular, they enjoy a duality, called the Feigin-Frenkel duality, which is a chiral analogue of the isomorphism between centers of the enveloping algebras of simple Lie algebras in Langlands duality. Recently, physicists found a suitable generalization for other types of nilpotent orbits from study on four dimensional supersymmetric gauge theory. In this talk, I will report the recent progress on our understanding of dualities in W-superalgebras since then in terms of several aspects: algebras, modules, and fusion rules.

Venue: via Zoom

Event Official Language: English

External Event

RIKEN AIP-Suri-joshi Joint Seminar

January 29 at 15:00 - 16:40, 2022

Dr. Ryosuke Iritani (Research Scientist, iTHEMS)
Dr. Ade Irma Suriajaya (Assistant Professor, Faculty of Mathematics, Kyushu University)
Dr. Motoko Kato (Assistant Professor, Faculty of Science, Ehime University)

"What are the personalities of AI and mathematical researchers? What kind of work do researchers do?" The RIKEN Center for Integrative Research on Innovative Intelligence (RIKEN AIP) and "Suri-joshi" are planning a joint event that will give high-school girls who are interested in mathematical scientists an opportunity to learn more about the fascinating work of AI and mathematical researchers.

Venue: via Zoom

Event Official Language: Japanese

Workshop

Co-hosted by iTHEMS

Towards the Use of Data Assimilation for COVID-19 Investigations

February 14 at 13:00 - 17:30, 2022

Prof. Catherine Beauchemin (Deputy Program Director, iTHEMS)
Dr. Takemasa Miyoshi (Team Leader, Data Assimilation Research Team, RIKEN Center for Computational Science (R-CCS))

This workshop aims to present recent investigations related to mathematical modeling of COVID-19 spread and impacts, and to foster the use of data assimilation techniques in future studies. It also aims to facilitate interactions and discussions among researchers from different fields such as epidemiology, economics, and mathematics. This workshop is jointly hosted by RIKEN Data Assimilation Research Team and by Nagoya University Graduate School of Mathematics, and supported by FY2021 RIKEN President's Discretionary Funds for COVID-19. A hybrid meeting is planned, but depending on the situation, an online version will be organized. Young researchers and students are encouraged to attend. Program: 13:00 - 13:10 Opening 13:10 - 14:00 Hiroshi Nishiura (Kyoto University) (35 min + 15 min Q&A) TBD 14:00 - 14:50 Catherine Beauchemin (RIKEN iTHEMS) (35 min + 15 min Q&A) The straight line: simple and effective 14:50 - 15:10 Break 15:10 - 16:00 Taisuke Nakata (The University of Tokyo) (35 min + 15 min Q&A) Balancing NPIs and Economic Activities 16:00 - 16:50 Qiwen Sun (RIKEN Data Assimilation Research Team, Nagoya University) (35 min + 15 min Q&A) Analysis of COVID-19 in Japan with Extended SEIR model and ensemble Kalman filter 16:50 - 17:30 Discussion

Venue: Hybrid Format (RIKEN R-CCS room 107 and Zoom)

Event Official Language: English

External Event

RIKEN Day: Let's Talk with Researchers! "Listening to the Ringing of a Black Hole"

February 25 at 18:00 - 18:30, 2022

Dr. Naritaka Oshita (Special Postdoctoral Researcher, iTHEMS)

In the February RIKEN Day, we will have a talk with Naritaka Oshita, a researcher who is researching on the theme of "Listening to the Ringing of a Black Hole." See related links for details.

Venue: via Zoom

Event Official Language: Japanese

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