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Cosmology (C) Lab
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The lab tests theory against observational data to explore the origin and evolution of the universe.
AboutAbout the lab
Testing how the universe came to be, using observational data.
The C Lab (Cosmology Lab) theoretically studies the origin, evolution, and structure of the universe itself.
Its activities center on "observational cosmology," which tests theoretical models against observational facts.
To build up the latest observational data and compare it with theoretical predictions, the lab uses large-scale numerical simulations and statistical methods for handling vast amounts of observational data.
Based on theoretical predictions, the lab also proposes observational projects.
Key terms
- Observational cosmology
- A field of research that uses observational data to test theoretical models explaining the origin, evolution, and structure of the universe
- Inflation
- A rapid expansion thought to have occurred immediately after the universe was born, in which its size increased by many orders of magnitude in an instant
- Dark matter
- An unidentified substance that cannot be seen with light but is known from its gravitational effects to exist in large amounts in the universe
NewsLab news
A paper by a doctoral student and faculty members was published in the Journal of Cosmology and Astroparticle Physics
A paper by a doctoral student and faculty members was published in the Journal of Cosmology and Astroparticle Physics
A researcher received the Best Poster Award at the international conference Concepts of Quantum and Spacetime
A master's student received the Graduate School of Science Commendation at Nagoya University
A paper by a doctoral student, researchers, and faculty members was published in Physical Review D
ResearchResearch themes
The lab theoretically studies the origin, evolution, and structure of the universe, centered on observational cosmology, which tests theoretical models against observational data. Lab members take part in projects such as Hyper Suprime-Cam on the Subaru Telescope, the Euclid space telescope, and the LSST at the Vera C. Rubin Observatory.
*Illustrative imageThe Early Universe
At the beginning of the universe, a rapid expansion called inflation is thought to have occurred, and quantum fluctuations gave rise to density fluctuations that later became the seeds of structure. The lab studies the period from inflation to recombination, when the universe became transparent, as the early universe.
*Illustrative imageThe Dark Ages and the Epoch of Reionization
The lab studies the "Dark Ages," the period from recombination until the first objects formed, and the "Epoch of Reionization," when the light of the first stars and other sources ionized the universe again. Observations with next-generation radio interferometers are anticipated, and theoretical studies carry out numerical calculations using radiative transfer simulations.
*Illustrative imageStructure Formation in the Universe
Taking up topics such as galaxies, galaxy clusters, voids, large-scale structure, dark matter, and cosmic magnetic fields, the lab studies when and how structures in the universe formed. Some work uses simulations to reproduce how the strength of cosmic magnetic fields changes the number of galaxies and the distribution of gas in galaxy clusters.
MembersFaculty
The members of the C Lab consist of faculty members, researchers, secretaries, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorKiyotomo Ichiki
- Associate ProfessorHironao Miyatake
- Assistant ProfessorShuichiro Yokoyama
- Project Assistant ProfessorShohei Saga
- Project Assistant ProfessorShintaro Yoshiura
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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: “Hubble reveals galactic drama -image 5- (heic0406h)” NASA, ESA, and S. Beckwith (STScI) and the HUDF Team / Public domain (cropped)
- The Early Universe: “Cosmic Microwave Background (CMB)” ESA and the Planck Collaboration / CC BY 4.0 (cropped)
- The Dark Ages and the Epoch of Reionization: “SKA-MPI-4” Square Kilometre Array Organisation (SKAO) / CC BY 3.0 (cropped)
- Structure Formation in the Universe: “Cosmic web” Volker Springel / Max Planck Institute For Astrophysics / CC BY-SA 4.0 (cropped)
- Related lab (Complexity Science Theory (ΣT) Lab): “Experimental hall of the Wendelstein 7-X stellarator at IPP Greifswald 03” Siarhei Besarab / CC BY-SA 4.0 (cropped)
- Related lab (Astrophysics (A) Lab): “CSIRO ScienceImage 559 Radio Telescopes at the Australia Telescope Compact Array” division, CSIRO / CC BY 3.0 (cropped)
- Related lab (Galaxy Evolution (Ω) Lab): “UGC 1810 and UGC 1813 in Arp 273 (captured by the Hubble Space Telescope)” NASA, ESA, and the Hubble Heritage Team (STScI/AURA) / Public domain (cropped)
- Related lab (Space Physics (Infrared) (Uir) Lab): “Technicians check out the mounting structure of the infrared telescope installed in NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA) (ED )” NASA Armstrong Flight Research Center / NASA/Tony Landis / Public domain (cropped)
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