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Particle Physics and Cosmology Lab
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A lab that uses theory to uncover the smallest units of matter and the makeup of the universe.
AboutAbout the lab
Solving the fundamental mysteries of nature through theory
The Particle Physics and Cosmology Lab theoretically studies the smallest units that make up matter, the fundamental forces acting between them, and the nature of time and space.
These questions are not independent but intricately intertwined. Unraveling such fundamental mysteries of nature is the aim of particle theory.
The research ranges from work that seeks to understand phenomena observed in accelerator experiments to work that explores, through theoretical consistency, the ultra-high-energy world beyond the reach of experiments.
It is a lab suited to those who want to pursue to the end the simple question of what the most fundamental principles and theories are.
Key terms
- Elementary particle
- The particle reached when matter is divided as finely as possible, which cannot be divided any further
- String theory
- A theory that tries to describe elementary particles not as points but as vibrations of tiny 'strings'
- Dark energy
- An energy of unknown nature thought to be the cause of the accelerating expansion of the universe
ResearchResearch themes
The lab conducts research in the area where particle physics, string theory, cosmology, and quantum gravity overlap. Its work spans building mathematical foundations to connecting with experiments and observations, with the aim of understanding the fundamental laws of nature.
*Illustrative imageString Theory
The work centers on the AdS/CFT correspondence, M-theory, and string phenomenology. The lab examines compactification, which curls up extra dimensions to a small size, non-invertible symmetries, and connections to particle models beyond the Standard Model.
*Illustrative imageCosmology
The lab deals with the rapid expansion of the universe (inflation), dark energy, and primordial gravitational waves. It studies the construction of inflation models, the analysis of cosmic microwave background data, and what gravitational wave observations imply for the physics of the early universe.
*Illustrative imageHigh-Energy Physics
The lab investigates the particles and forces that govern nature at its most fundamental level. Its research covers quantum field theory, particle phenomenology, and their connections to cosmology.
MembersFaculty
The members of the Particle Physics and Cosmology Lab are faculty members and students at the doctoral, master's, and undergraduate levels.As of 2026
- ProfessorTatsuo Kobayashi
- ProfessorOsamu Seto
- LecturerKazuhiko Suehiro
- Associate ProfessorSotaro Sugishita
- Assistant ProfessorDas Arindam
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: “Cosmic Microwave Background (CMB)” ESA and the Planck Collaboration / CC BY 4.0 (cropped)
- String Theory: “Calabi-Yau” Lunch / CC BY-SA 2.5 (cropped)
- Cosmology: “MergingBlackHoles V2” NASA/Ames Research Center/C. Henze / Public domain (cropped)
- High-Energy Physics: “CLICdp CLIC ILD ttbar 3TeV” CLIC / CC BY 4.0 (cropped)
- Related lab (医療基礎物理学研究室): “Cyclotron with glowing beam” 作者不詳 / Public domain (cropped)
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- Related lab (量子物性物理学研究室): “Thin section scan crossed polarizers Siilinjärvi R edit” kallerna / CC BY-SA 4.0 (cropped)
- Related lab (原子核理論研究室): “REX-ISOLDE” Maximilien Brice / CC BY 4.0 (cropped)
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