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ICRR Theory Group
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A theory group searching for new laws of physics by exploring the mysteries of the universe in its first second or so.

AboutAbout the lab
From the beginning of the universe to new laws of physics.
The theory group at the Institute for Cosmic Ray Research conducts theoretical research on the universe and elementary particles.
In particular, it works in fields known as particle cosmology and particle phenomenology.
Both fields aim to discover new laws of physics by investigating the mysteries of the very early universe, around one second after it began.
Key terms
- Inflation
- A rapid accelerated expansion thought to have occurred in the very early universe
- Standard Model
- A theory that describes all the elementary particles known so far, together with the forces acting between them
- Dark matter
- An unknown form of matter that cannot be seen with light, but is known from its gravitational effects to exist in large amounts in the universe
ResearchResearch themes
The lab conducts theoretical research on the universe and elementary particles from a variety of angles. It aims to discover new laws of physics by investigating the mysteries of the very early universe, around one second after it began.
*Illustrative imageUsing particle theory to understand the beginning of the universe
This field uses particle theory to understand how the universe began. It covers the rapid accelerated expansion of the early universe (the inflationary epoch), primordial black holes formed in the early universe, and the axion, a leading dark matter candidate.
*Illustrative imagePhysics beyond the Standard Model
This field builds physics models beyond the Standard Model and studies how they can be tested through experiments and observations. The Standard Model has problems such as the hierarchy problem of the Higgs boson mass and the strong CP problem, and the lab also works on supersymmetry and searches for dark matter.
MembersFaculty
The members of the Theory Group at the Institute for Cosmic Ray Research consist of faculty members, postdoctoral researchers, and doctoral and master's students.
- ProfessorMasahiro IbePublications ↗
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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: “CMB World Map plain map no annotations” Pablo Carlos Budassi / CC BY 4.0 (cropped)
- Using particle theory to understand the beginning of the universe: “History of the Universe EN” Woudloper / CC BY-SA 4.0 (cropped)
- Physics beyond the Standard Model: “Standard Model of Elementary Particles” Cush / Public domain (cropped)
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