The University of Tokyo

ICRR Theory Group

about us

We are a group of physicists working on theoretical Cosmology and Particle Physics. In paticular, we focus on Particle Cosmology and Particle Phenomenology.

  • Particle Cosmology
    In Particle Cosmology, we investigate the interplay between Particle Physics and Cosmology during the early history of the universe. For example, many physicists consider that the universe underwent an extremely rapid exponential expansion (inflationary epoch) and the inflationary epoch can be described by Particle Physics. Recently, the results of Cosmic Microwave Background(CMB) observations have been shedding the light on some aspects of the inflationary epoch. The future observations, such as DECIGO and LiteBIRD, are expected to reveal the whole picture of the inflationary epoch.
  • Particle Phenomenology
    In Particle Phonomenology, we make new physics models beyond the Standard Model and investigate how the new models can be tested through experiments and observations. Although the Standard Model can explain some phenomena in Particle Physics, there are some problems in the Standard Model, such as "Hierarchy problem" and "Strong CP problem". On-going and future accelerator experiments and cosmic observations are expected to give us some hints of the new physics beyond the Standard Model.


Email addresses are followed by

The list of former members is here.


In our group, we have a Journal Club every Thursday and a Colloquium every other Friday.

Former seminars are here.

Journal Club

In Journal Club, we introduce recent papers.

First semester in 2018

4/12 Ando

4/19 Hasegawa

4/26 Ibe

5/10 Hayashi

5/17 Kawasaki

5/24 Kobayashi

5/31 Suzuki

6/7 Nakatsuka

6/14 Obata

6/21 Otani

6/28 Sonomoto

7/5 Nakano


In Colloquium, we talk about our research.

First semester in 2018

4/13 Obata

4/27 Hayashi

5/11 Suzuki

5/25 Nakano

6/8 Sonomoto

6/22 Hasegawa

7/6 Ando



University of Tokyo, ICRR,5-1-5 Kashiwanoha,Kashiwa, 277-8582 Japan


Get off at Kashiwanoha Campus Station of Tsukuba Express (TX) train.
Walk to the University of Tokyo, Kashiwa Campus (25 min) or take a bus/taxi (5min).