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 Biology Seminar

Microeconomics of metabolism

March 10 at 10:00 - 11:00, 2021

Mr. Jumpei Yamagishi (Kaneko Laboratory, University of Tokyo)

Metabolic behaviors of proliferating cells are often explained as a rational choice to optimize cellular growth rate. In contrast, microeconomics formulates consumption behaviors as optimization probl...more

Venue: via Zoom

Event Official Language: English



March 11 at 9:30 - 14:30, 2021

We will hold the annual in-house gathering “iTHEMS NOW & NEXT” for this fiscal year as follows. Please join the event and see the activities in iTHEMS and its future. Program: 9:30-10:00 Keynote ...more

Venue: via Zoom

Event Official Language: English


Math Seminar

The Green-Tao theorem for number fields

March 22 at 16:00 - 18:10, 2021

Dr. Wataru Kai (Assistant professor, Mathematical Institute, Tohoku University)

5, 11, 17, 23, 29 are prime numbers which form an arithmetic progression of length 5. A famous theorem of Ben Green and Terence Tao in 2008 says there are arbitrarily long arithmetic progressions of p...more

Venue: via Zoom

Event Official Language: English


Math-Phys Joint Seminar

Self-adjoint extension in quantum mechanics and non-Rydberg spectra of one-dimensional hydrogen atom

April 13 at 16:00 - 18:10, 2021

Prof. Taksu Cheon (Professor, School of Environmental Science and Engineering, Kochi University of Technology)

We offer a beginner’s guide to the functional-analytical techniques in quantum mechanics, and cover its application to the 1D Coulomb problem. It is shown that the wave function at the diverging poin...more

Event Official Language: English

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Seeking a Postdoctoral Researcher (W20157) *physics of dynamical systems

Deadline: Open until filled

iTHEMS is seeking a postdoctoral researcher to work closely with Catherine Beauchemin in the field of physics of dynamical systems; primarily applied to virophysics. Work will primarily consist in constructing mathematical and computer models describing the dynamics of a viral infection within a host (in vivo) or a cell culture (in vitro). The models are validated against or applied to experimental infection data (e.g., daily virus concentration levels collected over the course of the infection) using Bayesian parameter estimation via a Markov chain Monte Carlo method. The projects are not experimental in nature: the data used in our research is gathered elsewhere by our collaborators or is taken from the literature. Ideal candidates will hold a PhD in Physics (computational, quantum, particle, astro, theoretical) or Applied Mathematics, and have excellent written English skills. No experience with anything to do with biology or virology is required or expected. Fellows should possess programming skills in python (preferably) or C/C++, Octave/Matlab, should already be familiar with or willing to learn the typesetting language LaTeX, be comfortable with a Linux operating system, and have experience in implementing and solving ordinary and partial differential equation systems or cellular automata/agent-based systems.

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Latest News


Seminar Report

Quantum Matter Seminar by Prof. Jan Budich on March 3, 2021

We are happy to invite Prof. Han Budich from the Dresden University of Technology to give a talk on March 3rd. The topic is Exceptional Topology of Non-Hermitian Systems: from Theoretical Foundations ...more


Person of the Week

Self-introduction: Yuta Sekino

I am Yuta Sekino, a JSPS fellow who joined iTHEMS on March 1, 2021. I am a theoretical physicist studying physics of ultracold atoms. My main research interest is universal properties of many-body sys...more


Person of the Week

Self-introduction: Takeru Yokota

My name is Takeru Yokota. I joined iTHEMS in March 2021. My research field is theoretical physics. I have been interested in the development of nonperturbative frameworks to describe many-body systems...more

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Upcoming Visitors

Dr. Nagisa Hiroshima

Visiting Scientist (Academia), iTHEMS

Term: March 18 - 23, 2021

Visiting Place: RIKEN Wako Campus

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