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Theoretical Astrophysics Lab
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A lab that seeks to understand the formation and evolution of astronomical objects in the universe from the standpoint of fundamental physics.
AboutAbout the lab
Exploring the birth and evolution of stars, galaxies, and black holes
The Theoretical Astrophysics Lab aims to understand, from fundamental physics, everything from the birth of the first stars and galaxies to galaxy clusters, black holes, and the formation and evolution of stars and planetary systems.
A distinctive feature of the lab's research is that it works with the radiative transfer equation and the relativistic radiation hydrodynamics equations, which incorporate the interaction between matter and light.
Alongside analytical studies, the lab carries out its research with large-scale numerical simulations on the supercomputers of the Center for Computational Sciences.
Key terms
- radiative transfer
- The theory describing how light propagates while interacting with matter
- accretion disk
- A rotating disk formed around a black hole by matter captured by its gravity
- protocluster
- A region in the early universe where galaxies are densely packed
NewsLab news
Prof. Ohsuga was selected as a University of Tsukuba 2024 Best Faculty Member
Students received awards including the Alumni Association Esaki Award, the Chair's Award of the Pure and Applied Sciences graduate division, and the President's Award
ResearchResearch themes
The lab aims to understand the formation and evolution of astronomical objects in the universe from fundamental physics. Using analytical studies and large-scale numerical simulations on supercomputers, it investigates galaxies, black holes, and the formation of stars and planetary systems.
*Illustrative imageDiversity of galaxy evolution in protoclusters
Observations of the distant universe have found protocluster regions where galaxies are densely packed in the early universe, and a wide variety of galaxy evolution has been reported there. The mechanism behind this is still unknown, and the lab aims to clarify galaxy evolution within the large-scale structure of the universe.
*Illustrative imageAccretion flows and outflows of black holes
The lab aims to clarify the structure and dynamics of black hole accretion disks and the formation mechanisms of gas outflows such as jets. This research contributes to understanding how energy is generated in high-energy astrophysical objects and how supermassive black holes grow.
*Illustrative imageDirect comparison between theory and observation
The lab investigates how black hole accretion disks, jets, and disk winds appear in observations, by comparing theoretical calculations with observational results. The goal is to clarify the spacetime structure of black holes and high-energy phenomena in strong gravitational fields.
*Illustrative imageRadiative transfer codes for black hole observations
The lab develops general relativistic radiative transfer codes that theoretically produce the radiation spectra and wavelength-by-wavelength images obtained in black hole observations. RAIKOU, a multi-wavelength code, solves the propagation of light around black holes with high accuracy.
MembersFaculty
The members of the Theoretical Astrophysics Lab are faculty, researchers, doctoral, master's, and undergraduate students, and administrative assistants.As of 2026
- ProfessorKen Ohsuga
- ProfessorHidenobu Yajima
- Associate ProfessorMasao Mori
- Associate ProfessorKohji Yoshikawa
- Assistant ProfessorHajime Fukushima
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “NASA Unveils Celestial Fireworks as Official Hubble 25th Anniversary Image” NASA, ESA, the Hubble Heritage Team (STScI/AURA), A. Nota (ESA/STScI), and the Westerlund 2 Science Team / Public domain (cropped)
- Diversity of galaxy evolution in protoclusters: “Galaxy cluster in the Capodimonte Deep Field (eso0116e)” ESO / CC BY 4.0 (cropped)
- Accretion flows and outflows of black holes: “Parkes Radio Telescope (CSIRO)” Amanda Slater / CC BY-SA 2.0 (cropped)
- Direct comparison between theory and observation: “Black hole - Messier 87” Event Horizon Telescope / CC BY 4.0 (cropped)
- Radiative transfer codes for black hole observations: “Center of the Milky Way Galaxy IV – Composite” NASA/JPL-Caltech/ESA/CXC/STScI / Public domain (cropped)
- Related lab (宇宙観測グループ（宇宙観測研究室）
): “Eyes on the Skies (beletsky alma 15-cc2)” ESO/Y. Beletsky / CC BY 4.0 (cropped) - Related lab (素粒子理論グループ（素粒子論研究室）
): “Particle Interactions Calculated on Titan Support the Search for New Physics Discoveries” OLCF / CC BY 2.0 (cropped) - Related lab (量子物性理論
（初貝・溝口・曽根研究室） ): “Crystal lattice with hugin sky background” Engelbert Niehaus / CC BY 4.0 (cropped) - Related lab (ナノフォトニクス
（久保研究室） ): “COVID-19- DOE Response Researchers with UEM microscope ( )” U.S. Department of Energy from United States / Public domain (cropped)
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