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Kase Lab
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An astrophysics and cosmology lab that explores dark energy and black holes through theories of gravity.
AboutAbout the lab
Solving open problems of the universe and gravity through theory.
Kase Lab conducts research that theoretically resolves unsolved problems in cosmology and gravitational theory, using the latest observational data.
It has two main pillars: elucidating the origin of dark energy, and studying black holes and neutron stars based on general relativity and its extended theories of gravity.
The lab is divided into three groups for its research: the cosmology group, the compact object group, and the numerical relativity group.
In graduation research, students first learn general relativity from the basics in a lab seminar held in a round-robin reading format in the first semester, then work on a theme of their own choosing in the second semester.
Key terms
- Dark energy
- An unknown energy that causes the expansion of the universe to accelerate. It is said to account for about 70% of the total energy of the present universe.
- General relativity
- The theory of gravity that forms the basis for describing the universe. It has been verified to hold with high accuracy in local regions such as the solar system.
- Gravitational waves
- A phenomenon in which gravity propagates through spacetime like ripples. Those observed so far come from mergers of binary black holes and neutron stars.
- Numerical relativity
- A simulation method that uses large-scale numerical computation to study phenomena that are difficult to analyze, such as mergers of binary systems.
NewsLab news
Presented the lab at the Faculty of Science Division II's own evening open campus event
A fourth-year undergraduate student received the top academic achievement award in the Department of Physics, Faculty of Science Division II
A master's student released a paper co-authored with an Assistant Professor and others on a preprint server
A paper co-authored by a postdoctoral researcher, a master's student, an Assistant Professor, and others was published in Physical Review D
A doctoral student and a master's student received a special award at the research meeting JOINT WORKSHOP ON GENERAL RELATIVITY AND COSMOLOGY 2025
ResearchResearch themes
The lab aims to theoretically resolve unsolved problems in cosmology and gravitational theory, using the latest observational data. Its two main pillars are elucidating the origin of dark energy, and studying black holes and neutron stars based on general relativity and its extended theories of gravity.
*Illustrative imageElucidating the origin of dark energy
Dark energy is an unknown component hypothesized as the source of the accelerating expansion of the universe. The latest observations show that it accounts for about 70% of the total energy of the present universe, but its origin is unknown, and the lab works to elucidate it.
*Illustrative imageResearch on black holes and neutron stars
Black holes and neutron stars are extremely massive objects formed after the gravitational collapse of stars. The lab studies them based on general relativity and its extended theories of gravity. Observations of gravitational waves and black hole shadows now make it possible to probe strong gravitational fields, and momentum is growing toward testing theories of gravity.
MembersFaculty
Members of Kase Lab consist of faculty, doctoral, master's, and undergraduate students, and research collaborators.As of 2026
- Associate ProfessorRyotaro Kase
- Assistant ProfessorNaoki Tsukamoto
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. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “LIGO Hanford aerial 05” LIGO Laboratory / Public domain (cropped)
- Elucidating the origin of dark energy: “CMB Timeline300 no WMAP” NASA/WMAP Science Team / Public domain (cropped)
- Research on black holes and neutron stars: “Black hole devours a neutron star 01” Dana Berry/NASA / Public domain (cropped)
- Related lab (鈴木研究室): “CERN Large Hadron Collider” Chris Mitchell / CC BY-SA 4.0 (cropped)
- Related lab (柳生研究室): “Large Hydron Collider Segment photographed by Robbie Conceptuel” Conceptuel / CC0 (cropped)
- Related lab (二国研究室): “Bose-Einstein Condensate (BEC) ( )” National Institute of Standards and Technology / Public domain (cropped)
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