筑波大学 宇宙物理学研究室 森正夫
Theoretical Astrophysics and Computational Physics

Preface

Welcome to the website of the astrophysics research team led by Masao Mori at the University of Tsukuba. Our team advances astrophysics by combining numerical simulations, analytical theory, and observational data analysis. Research topics include galaxy formation and evolution, the role of dark matter in cosmic structure formation, galaxy collisions, supermassive black hole activity, galactic winds, and habitable zones within galaxies.

We specialize in computational astrophysics, developing large scale simulations and theoretical models to study the complex dynamics of galaxies. By working closely with observational researchers, we bridge theory and data to build a more unified view of the universe. On the methodological side, we develop high accuracy numerical schemes, massively parallel algorithms, and GPU based acceleration techniques, and we are now applying machine learning to astrophysical problems. We are also extending these computational approaches to education and to the field of computational sports science.

Portrait
Campus

We are dedicated to nurturing the next generation of astrophysicists. Our group welcomes both undergraduate and graduate students, offering opportunities to participate in cutting edge research. At the University of Tsukuba, graduate school entrance examinations are held three times a year: a recommendation based exam in July, and general admissions in August and February. We actively encourage applications from students at other universities as well.

Please note that acceptance depends strongly on the current situation of the laboratory, including supervision capacity, funding, and project availability. Before starting any application process, please contact us to confirm whether we can host a new student and to discuss fit with ongoing projects.

Masao Mori

Team 2025

Research

My research activities so far

“How did the cosmos begin, and how did it become what it is today?” — this fundamental question has captivated humanity since ancient times. Cosmology and astrophysics seek to answer it through the lens of physics. George Gamow’s theory (Gamow 1984) laid the foundation for modern discussions on the universe’s origin and has guided observational efforts throughout the 20th and 21st centuries. Today, it is widely accepted that the universe began 13.8 billion years ago in a hot, dense state—the Big Bang—and that the formation and evolution of celestial structures in the expanding universe have shaped the cosmos we observe.
Our research group aims to uncover how galaxies have evolved over cosmic time and to explore their future, grounded in the principles of natural science.

Shanghai

Activities

What's new

This section highlights our latest research activities, including publications, conference presentations, media coverage, and collaborative projects. We also share updates on team events and extracurricular activities that strengthen connections and promote a healthy work-life balance within the group.

  • Apr. 13, 2026
    In addition, Moeko Hori, a master's student in the Degree Program in Education, joined our team this year, bringing the total number of student members to 11.
  • Apr. 10, 2026
    This year, in addition to one Ph.D. student and seven M.S. students currently enrolled, we welcomed two new undergraduate members, Taisei Nishihama and Haruto Masumitsu, bringing our total student members to ten as we begin our research activities.
  • Apr. 1, 2026
    Koki Ohtaki (graduated in 2023) has left his position as a researcher at the University of Rome and has been appointed Assistant Professor at the Information Technology Center, the University of Tokyo. Congratulations!
About Image

About me

Who I am

Masao Mori

Ph.D. (Science), Associate Professor

  • Visiting Associate Professor, University of California, Los Angeles (Feb. 2005 - Mar. 2006)
  • Visiting Researcher, Max Planck Institute for Astronomy (Aug. 1998 - Aug. 1999)
Team 2025

Our Team

Group members for this year and graduates

Below, you will find information about my current team members and graduates.

Current Members

  • Misa Yamaguchi (PhD student, 2nd year)
    JSPS Research Fellow (DC2)
    Spatiotemporal Evolution of Galaxy Collisions and the Galactic Habitable Zone
  • Kanta Aimoto (MSc student, 2nd year)
    Hydrodynamic Interactions in Collisions between Galactic Disks and Satellite Galaxies
  • Mayuka Oda (MSc student, 2nd year)
    Scaling Relations and Structural Evolution of Cluster-Scale Dark Matter Halos
  • Michi Shinozaki (MSc student, 2nd year)
    Dark Matter Models Probed through the Diversity of Internal Structures in Dark Matter Halos
  • Yoshitomo Takahashi (MSc student, 2nd year)
    Development of High-Precision Hydrodynamic Schemes and Their Applications to Galaxy Formation
  • Akifumi Takayama (MSc student, 2nd year)
    Galaxy Collisions and the Activity of Supermassive Black Holes in Galactic Centers
  • Maria Arima (MSc student, 1st year)
    An Analytic Model for Galactic Outflows in Forming Galaxies in the Early Universe
  • Moeko Hori (MSc student, 1st year, Degree Program in Education)
    Galactic Habitable Zone and the Evolution of Galaxies
  • Taisei Nomura (MSc student, 1st year)
    Development and Applications of High-Precision N-Body Integration Schemes for Self-Gravitating Systems with Heterogeneous Components
  • Taisei Nishihama (Undergraduate student, 4th year)
    Formation and Evolution of Galaxies
  • Haruto Masumitsu (Undergraduate student, 4th year)
    Formation of Dark Matter Deficient Galaxies through Dark Matter Halo Collisions

Achievements

Achievements

A summary of my research Highlights

Below is a list of my recent research papers, selected papers to date, and received research funding.

Recent publications

  • Accelerated Hermite integrator for orbital integration with OpenACC and MPI,
    Otaki, Koki; Mori, Masao; Miki, Yohei; Takahashi, Daisuke, submitted to the Journal of Supercomputing.
  • Cusp-to-Core Transition of Dark Matter Halos across Galaxy Mass Scales,
    Hayashi, Kohei; Kaneda, Yuka; Mori, Masao, Shinozaki, Michi, has been accepted for publication in the Publications of the Astronomical Society of Japan. [PASJ / arXiv:2507.22155]
  • The Characteristic Mass and Energy Conversion Efficiency in the Cusp-Core Transition of Dark Matter Haloes: Implications for Scaling Relations and Supernova Feedbacks,
    Shinozaki, Michi; Mori, Masao; Kaneda, Yuka; Hayashi, Kohei, Monthly Notices of the Royal Astronomical Society, 547, 1-12 (2026). [MNRAS / arXiv:2601.13868]
Lecture Room

Lectures

Lectures for this academic year

FY2026

  • Undergraduate Programms
    • General concept of astrophysics: Fall AB, Fri. 4
    • Diploma thesis research advice

  • Postgraduate Programmes
    • Fundamental Physics 2: Fall AB, Mon. 3
    • Special Research in Astrophysics
    • Master thesis advice
    • Doctor thesis advice

  • Seminars
    • Mori's Group Seminar
    • Galaxy Seminar

Contact

Contact

Feel free to contact

mmori@ccs.tsukuba.ac.jp

Center for Computational Sciences, University of Tsukuba
Tennodai 1-1-1, Tsukuba, Ibaraki 305-8577, Japan

+81 (O)29 853 6O34