Largest dark matter simulation using K computer and supercomputer ATERUI
- Elucidating the formation and evolution of dark matter halos over 13.8 billions years, from the early universe to the present with the greatest accuracy ever -
It is said that 5 times as much dark matter exists compared to baryonic matter*, which is the ordinary substance we see as atoms and molecules. It is important to understand the evolution of dark matter in order to reveal the structural formation of the Universe. Through the effects of gravity, dark matter halo merges together to form larger structures. There is an extended dark matter halos around a galaxy whose mass is 10 times as large as the total mass of all the stars in the galaxy.
The research group calculated gravitational evolution of 550 billion dark matter particles from the early Universe, during a period of 13.8 billion years . The size of the volume for the simulations was 5.4 billion light years on each axis. The simulation in this huge space yields the world’s highest resolution ever, and is the world’s largest simulation of dark matter structural formation.
Mock catalogues of galaxies and active galactic nuclei will be prepared. These will be comparable to actual astronomical observations, and will be publicly available in the near future.
*Baryon: A baryon is a composite subatomic particle made up of three quarks. The most familiar baryons are the protons and neutrons that make up most of the mass of the visible matter in the universe.
Ishiyama T., Enoki M., Kobayashi M., Makiya R., Nagashima M.. and Oogi T., Publ Astron Soc Jpn, doi: 10.1093/pasj/psv021.
Figure: Dark matter distribution
- Related Links:
Chiba University (Japanese Press Release)
Center for Computational Astrophysics (Japanese Press Release)