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Theoretical Cosmology Lab
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A lab that uses physics to describe the evolutionary history of the universe, from its birth to the present.

AboutAbout the lab
Describing the evolution of the universe through physics
The Theoretical Cosmology Lab is a group that has been advancing research in astrophysics and observational cosmology.
The universe is a physical system in which many physical processes, from microscopic to macroscopic scales, are intricately intertwined.
Currently, the lab works on the formation of astrophysical objects and the exploration of the distant universe, as well as on machine learning and data science problems related to them.
The lab aims to remain open at all times, and actively collaborates with research institutions in Japan and abroad, including the Research Center for the Early Universe (RESCEU) and the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU).
Key terms
- Observational cosmology
- A research field that explores the origin and evolution of the universe through observations with telescopes and other instruments
- Dark matter
- Matter that cannot be seen in light but exerts gravity. It is thought to account for one-fifth of the total energy density of the universe
- Cosmic microwave background
- Light from the very early universe that still reaches us today from the entire sky
ResearchResearch themes
The shared goal is to describe, through physics, the evolutionary history of the universe from its birth to the present and on into the future. To this end, the lab values interdisciplinary, cross-field activities.
*Illustrative imageAstrophysical Object Formation and Exploration of the Distant Universe
This is the central topic the lab is currently working on. The lab investigates how astronomical objects form and explores the early universe far away.
*Illustrative imageData Analysis with Machine Learning
The lab studies methods for analyzing observational data with machine learning. Machine learning and data science techniques are also used in research on the formation of astrophysical objects and the exploration of the distant universe.
*Illustrative imageDark Matter and the Distribution of Galaxies
The lab studies the gravitational evolution of the dark matter distribution and the clustering statistics of galaxies. It investigates how the dominant component of the universe, whose nature is still unknown, grows and shapes the distribution of galaxies.
*Illustrative imageDetection of the Gravitational Wave Background
The lab also aims to pioneer original topics that are not bound by existing frameworks. Detecting background gravitational waves through polarization observations of the cosmic microwave background is one of the new topics that will drive the next generation of cosmology.
MembersFaculty
The members of the Theoretical Cosmology Lab consist of faculty, doctoral and master's students, and project researchers.As of 2026
- ProfessorNaoki YoshidaPublications ↗
- Assistant ProfessorKana MoriwakiPublications ↗
- Assistant ProfessorChinami Kato
- Project Assistant ProfessorErika Ogata
- Project Assistant ProfessorEnrico Garaldi
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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: “Computer simulation of a Lyman-alpha Blob” J.Geach/D.Narayanan/R.Crain / CC BY 4.0 (cropped)
- Astrophysical Object Formation and Exploration of the Distant Universe: “Zooming in on the early Universe RXC J” ESA/Hubble & NASA, RELICS / CC BY 4.0 (cropped)
- Data Analysis with Machine Learning: “Oak Ridge - Kraken (Cray XT5)” Daderot / Public domain (cropped)
- Dark Matter and the Distribution of Galaxies: “Simulation of large scale structure (eso1438b)” Illustris Collaboration / CC BY 4.0 (cropped)
- Detection of the Gravitational Wave Background: “Polarization map ESA Planck 2018” Pablo Carlos Budassi / CC BY 4.0 (cropped)
- Related lab (樺島研究室): “Magnetic domains of grain oriented silicon or electrical steel” Matesy / CC BY-SA 3.0 (cropped)
- Related lab (石野研究室(ICEPP)): “CERN LHC ATLAS Detector” SimonWaldherr / CC BY-SA 4.0 (cropped)
- Related lab (日下研究室): “Cosmic Microwave Background (CMB)” ESA and the Planck Collaboration / CC BY 4.0 (cropped)
- Related lab (生体非平衡物理学研究室): “Nematic liquid crystal” Ingo Dierking / CC BY-SA 4.0 (cropped)
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