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Fujii Lab
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The lab recreates the birth and evolution of star clusters and galaxies inside a computer.
AboutAbout the lab
Watching the long history of the universe through simulation
The Fujii Lab uses simulations to study how galaxies, star clusters, and planetary systems form and how they have evolved.
The lab's core method is N-body simulation, which follows systems of particles such as stars, dark matter, and planetesimals bound together by gravity by calculating the motion of each individual particle.
The real appeal of simulation research is that it lets researchers "see" the evolution of the universe, which unfolds over timescales far longer than a human lifetime.
The lab also develops the computational codes needed for large-scale simulations.
Key terms
- N-body simulation
- A computational method that calculates the motion of many particles attracted to one another by gravity, one by one, in order to follow how the system as a whole changes
- Globular cluster
- A spherical group of many old stars densely packed together, found around a galaxy
- Gravitational waves
- Ripples in spacetime produced when massive objects move violently, which propagate outward as waves
ResearchResearch themes
The lab uses simulations to investigate how gravitationally bound objects such as galaxies, star clusters, and planetary systems formed and evolved into their present form. It also develops computational methods that bring out the full performance of new computers.
*Illustrative imageThe Origin of Star Cluster Diversity
Most stars are born in groups, and when they are densely packed they become star clusters bound by gravity. The lab studies how a wide variety of clusters form and evolve, from young, low-density open clusters to old, high-density globular clusters.
*Illustrative imageReproducing How Star Clusters Form
Where and how globular clusters formed remains a mystery. Using simulations that reproduce the process by which gas inside a cluster is blown away by stellar evolution, the lab aims to clarify how various kinds of star clusters form.
*Illustrative imageGlobular Clusters and Gravitational Waves
At the center of dense globular clusters, massive black holes are thought to gather and form binaries, which eventually emit gravitational waves and merge. Using star cluster simulations, the lab examines questions such as how frequently gravitational waves are emitted.
*Illustrative imageGalactic Bars and Spiral Arms
In galactic disks, spiral arms and bar structures arise from the disk's own gravity and from the influence of companion galaxies. By simulating the conditions under which they form and how they change over time, the lab seeks to uncover the origin of the diversity of disk galaxies.
MembersFaculty
- ProfessorMichiko FujiiPublications ↗
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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: “Full Hubble ACS Image of NGC )” NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration / Public domain (cropped)
- The Origin of Star Cluster Diversity: “Pleiades large” NASA, ESA, AURA/Caltech, Palomar Observatory The science team consists of: D. Soderblom and E. Nelan (STScI), F. Benedict and B. Arthur (U. Texas), and B. Jones (Lick Obs.) / Public domain (cropped)
- Reproducing How Star Clusters Form: “NASA Unveils Celestial Fireworks as Official Hubble 25th Anniversary Image” NASA, ESA, the Hubble Heritage Team (STScI/AURA), A. Nota (ESA/STScI), and the Westerlund 2 Science Team / Public domain (cropped)
- Globular Clusters and Gravitational Waves: “Hubble image of globular cluster M13 (opo0840a)” NASA, ESA, and the Hubble Heritage Team (STScI/AURA) / Public domain (cropped)
- Galactic Bars and Spiral Arms: “Hubble2005-01-barred-spiral-galaxy-NGC1300” NASA, ESA, and The Hubble Heritage Team STScI/AURA) / Public domain (cropped)
- Related lab (Umeda Lab): “EtaCarinae” Nathan Smith (University of California, Berkeley), and NASA / Public domain (cropped)
- Related lab (Kashikawa Lab): “Subaru Telescope. Mauna Kea Summit ( )” Robert Linsdell / CC BY 2.0 (cropped)
- Related lab (Shimasaku Lab): “Webb's First Deep Field” NASA, ESA, CSA, and STScI / Public domain (cropped)
- Related lab (Totani Lab): “Cosmic web” Volker Springel / Max Planck Institute For Astrophysics / CC BY-SA 4.0 (cropped)
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