RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program

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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.

About iTHEMS

Upcoming Events



iTHEMS Colloquium

Mirror symmetry and KAM theory

April 16 at 13:30 - 15:00, 2021

Prof. Kenji Fukaya (Permanent Member, Simons Center for Geometry and Physics, Stony Brook University, New York, USA)

13:30pm-15:00pm (JST) Mirror symmetry is a phenomenon discovered in String theory and is much discussed recently in mathematics especially in the field of complex (algebraic) geometry and symplecti...more

Venue: via Zoom

Event Official Language: English

Special Lecture

iTHEMS x academist online open to the public "Mathematical Science World"

April 18 at 10:00 - 16:30, 2021

Dr. Kanato Goto (Special Postdoctoral Researcher, iTHEMS)
Dr. Jeffrey Fawcett (Senior Research Scientist, iTHEMS)
Dr. Takuya Sugiura (Postdoctoral Researcher, iTHEMS)
Dr. Naomi Tsuji (Postdoctoral Researcher, iTHEMS)
Dr. Keita Mikami (Research Scientist, iTHEMS)
Dr. Tetsuo Hatsuda (Program Director, iTHEMS)

Please register on the special website to participate.

Venue: via Zoom

Event Official Language: Japanese


iTHEMS Biology Seminar

The rheotaxis mechanism of swimming ciliates

April 22 at 10:00 - 11:00, 2021

Dr. Yukinori Nishigami (Research Institute for Electronic Science, Hokkaido University)

The swimming unicellular organisms, which live in freshwater, need to resist currents in the environment. Without this ability, their habitat changes with the flow, and they cannot survive in nature f...more

Venue: via Zoom

Event Official Language: English


MACS Colloquium Supported by iTHEMS

The 15th MACS colloquium

April 23 at 15:00 - 17:30, 2021

Prof. Hiroshi Ishikawa (Professor, Faculty of Science and Engineering, Waseda University)

プログラム 15:00〜16:00 第15回MACSコロキウム「機械に認識させるとはどういうことか」石川 博 博士 16:05~17:30 2021年度MACS学生説明会

Venue: via Online

Event Official Language: Japanese


Information Theory SG Seminar

Thermodynamic Uncertainty Relation Connects Physics, Information Science, and Biology

April 28 at 13:30 - 16:00, 2021

Prof. Yoshihiko Hasegawa (Associate Professor, Department of Information and Communication Engineering, The University of Tokyo)

Higher precision demands more resources. Although this fact is widely accepted, it has only recently been theoretically proved. The thermodynamic uncertainty relation serves as a theoretical basis for...more

Venue: via Zoom

Event Official Language: English

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Seeking a Postdoctoral Researcher or Research Scientist (W21003)

Deadline: Open until filled

Postdoctoral Researcher or Research Scientist, a few positions. In particular, the applicant(s) are expected to spend at least 50% of their time carrying out original research developing numerical models to describe biological systems, such as the spread of virus in a cell culture, in collaboration with Dr. Catherine Beauchemin.

Call for applications for the position of Special Postdoctoral Researcher (SPDR) for FY 2022

Deadline: April 22, 2021

RIKEN is currently accepting applications for the FY 2022 Special Postdoctoral Researcher (SPDR) Program, from young, creative, independent researchers who will be a powerful force in furthering RIKEN's research activities.

More opportunities

Latest News


Hot Topic

iTHEMS Starter Meeting for FY 2021 on April 9, 2021

iTHEMS officially kicked off its activity for FY 2021 by the iTHEMS Starter Meeting for FY 2021, on April 9th 2021. The meeting was held over Zoom as last year's meeting. Over sixty iTHEMS members ga...more


Event Schedule

Events for the 4th week of April 2021

The iTHEMS x academist online open to the public "Mathematical Science World" and the MACS Colloquium are scheduled for next week. Sunday, April 18, 10:00- iTHEMS x academist Online open to the pu...more


Paper of the Week

Week 3 of April 2021

Title: Approximate Bayesian Computation of Bézier Simplices Author: Akinori Tanaka, Akiyoshi Sannai, Ken Kobayashi, Naoki Hamada arXiv: http://arxiv.org/abs/2104.04679v2 Title: Detailed analysis ...more

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