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Omukai Lab (TAP Theoretical Astronomy Group)
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A lab that explores the formation of astronomical objects and high-energy phenomena through theory.
AboutAbout the lab
Exploring the formation of astronomical objects and high-energy phenomena through theory
The Theoretical Astrophysics Group, to which the Omukai Lab belongs, conducts theoretical research on astrophysics in general, starting with the formation of astronomical objects and high-energy phenomena.
Using theoretical calculations, the group studies the process by which objects such as galaxies, stars, and planets are born from tiny density fluctuations in the early universe.
Another research theme is the violent activity of compact objects and the mechanisms by which particles gain high energy there.
Professor Omukai, Associate Professor Kashiyama, and Associate Professor Tomida each accept students for supervision.
Key terms
- Density fluctuations
- Slight differences in density from place to place in the early universe. They grew through gravity and became the seeds of astronomical objects.
- Compact objects
- Objects such as black holes and neutron stars that form after a star has used up its nuclear fusion fuel and contracted under gravity.
- Gamma-ray bursts
- One type of object that shows the violent activity of compact objects. They are observed over a wide range of wavelengths, from radio waves to gamma rays.
NewsLab news
Professor Kazuyuki Omukai received the Hayashi Chushiro Prize from the Astronomical Society of Japan
Associate Professor Kengo Tomida received the 21st Morita Memorial Award of the Faculty of Science, Tohoku University
A master's student won first place in the Oral Award at the Summer School for Young Researchers in Astronomy and Astrophysics
A master's student received the Student Outstanding Presentation Award at the Physical Society of Japan
A master's student won first place in the Poster Award at the Summer School for Young Researchers in Astronomy and Astrophysics
ResearchResearch themes
The Theoretical Astrophysics Group conducts theoretical research on astrophysics in general, starting with the formation of astronomical objects and high-energy phenomena. It investigates theoretically how astronomical objects in the universe are born and how particles reach high energies through the activity of compact objects.
*Illustrative imageFormation of astronomical objects in the universe
The group studies the process by which tiny density fluctuations in the early universe grew through gravity and became objects such as galaxies, stars, and planets, using theoretical calculations that take into account gravity as well as radiative and chemical processes. Topics include the formation of the first stars and the first galaxies.
*Illustrative imageCompact objects and high-energy phenomena
The violent activity of compact objects such as black holes and neutron stars is observed in objects such as pulsars, supernova remnants, and gamma-ray bursts. The group studies the structure of these objects while working to clarify the processes by which particles gain high energy.
MembersFaculty
The members of the Theoretical Astrophysics Group consist of faculty, postdoctoral researchers, and doctoral and master's students.As of 2026
- ProfessorKazuyuki Omukai
- Associate ProfessorKazumi Kashiyama
- Associate ProfessorKengo Tomida
VoicesStudent voices
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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.
- Top image: “Hubble2005-01-barred-spiral-galaxy-NGC1300” NASA, ESA, and The Hubble Heritage Team STScI/AURA) / Public domain (cropped)
- Formation of astronomical objects in the universe: “Hubble ultra deep field” NASA and the European Space Agency. / Public domain (cropped)
- Compact objects and high-energy phenomena: “Supernova remnant CTB 37A” Image credit: X-ray: NASA/CXC/Morehead State Univ/T.Pannuti et al; Radio: Molonglo Obs. Synthesis .; Infrared: NASA/JPL-Caltech / Public domain (cropped)
- Related lab (Tomida Lab): “HD 163296 protoplanetary disk by ALMA (16CB25B)” ALMA (ESO/NAOJ/NRAO); A. Isella; B. Saxton (NRAO/AUI/NSF) / CC BY 4.0 (cropped)
- Related lab (Yoshida Lab): “The Star with a Secret Identity” X-ray: NASA/CXC/Huntingdon Inst. for X-ray Astronomy/G.Garmire, Optical: ESO/VLT / Public domain (cropped)
- Related lab (Tanaka Lab): “Planets in the Making” ALMA (ESO/NAOJ/NRAO); A. Isella; B. Saxton (NRAO/AUI/NSF) / CC BY 4.0 (cropped)
- Related lab (Kimura Lab): “Anatomy of an Active Galactic Nucleus (SVS14922 - Jet illustrated Loop v01 00001 print)” NASA's Scientific Visualization Studio - NASA’s Goddard Space Flight Center’s Conceptual Image Lab / Public domain (cropped)
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