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Theoretical Particle Physics and Cosmology Lab
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A lab that explores everything from particle theory to the early universe and superstring theory.
AboutAbout the lab
Exploring the ultimate nature of matter through theory.
The Theoretical Particle Physics and Cosmology Lab studies, from a theoretical standpoint, elementary particles, the most fundamental building blocks of matter, and the fundamental interactions acting between them.
The foundations of particle physics are quantum mechanics and special relativity.
Elementary particles are also deeply connected to the universe, and the lab also studies the early universe based on particle theory.
The lab also works on superstring theory, a leading candidate for unifying all interactions including quantum gravity, and on the mathematical structure of quantum field theory.
Key terms
- Quantum field theory
- The theoretical framework used to describe elementary particles. Among such theories, gauge theory is regarded as especially important.
- Superstring theory
- A leading candidate for a theory that unifies all interactions, including quantum gravity. It inevitably predicts the existence of the graviton.
- Inflation
- The rapid expansion thought to have occurred immediately after the birth of the universe, driven by the large energy of the vacuum.
ResearchResearch themes
Particle physics aims to clarify the most fundamental building blocks of matter and the fundamental laws that govern natural phenomena. This lab conducts wide-ranging research in particle theory and particle cosmology.
*Illustrative imageTheory of High-Energy Phenomena
The lab theoretically studies particle phenomena that occur in accelerator experiments, both running and planned, as well as the emergence of new phenomena in various precision measurements.
*Illustrative imageStudy of the Early Universe
With the main aim of building a consistent cosmology based on particle theory and testing it through observation, the lab studies inflation models, the generation of the matter-antimatter asymmetry, dark matter models, and the evolution of density fluctuations.
*Illustrative imageSuperstring Theory and Quantum Field Theory
The lab pursues research to elucidate the mathematical structures of superstring theory and quantum field theory.
MembersFaculty
The members of the Theoretical Particle Physics and Cosmology Lab consist of faculty, visiting researchers, postdoctoral researchers, doctoral and master's students, and secretaries.As of 2026
- ProfessorMasahiro Yamaguchi
- ProfessorFuminobu Takahashi
- ProfessorYukinari Sumino
- Associate ProfessorHiroshi Ishikawa
- Associate ProfessorKazuya Yonekura
- Associate ProfessorKazunori Nakayama
- Associate ProfessorMasaki Yamada
- Associate ProfessorNaoya Kitajima
- Assistant ProfessorMasahiro Hotta
- Assistant ProfessorYoichi Yamada
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: “Kedr-detector-inp-0811” Вадим Махоров / CC BY 4.0 (cropped)
- Theory of High-Energy Phenomena: “Compact Linear Accelerator for Research and Applications (CLARA)” D2theW / CC0 (cropped)
- Study of the Early Universe: “Cosmic Microwave Background (CMB)” ESA and the Planck Collaboration / CC BY 4.0 (cropped)
- Superstring Theory and Quantum Field Theory: “CalabiYau5” Andrew J. Hanson / CC BY-SA 3.0 (cropped)
- Related lab (Condensed Matter Theory Lab): “Redes de Bravais” The original uploader was Angrense at Portuguese Wikipedia. / CC BY-SA 3.0 (cropped)
- Related lab (IMR Theoretical Physics Lab): “Na8Si46 inorganic clathrate structure with coordination polyhedra” PickledSquid / CC BY-SA 4.0 (cropped)
- Related lab (Nuclear Theory Lab): “Alpha-beta-gamma decay” Kailogical / CC BY-SA 4.0 (cropped)
- Related lab (Functional Properties of Thin-Film Interfaces Lab): “Molecular Beam Epitaxy” Nikhil P / CC BY-SA 3.0 (cropped)
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