A simulation of the entire universe, from Big Bang to now

An international team of researchers has produced the most accurate simulation of the universe to date, using supercomputers to model the entire history of the universe from the Big Bang to the present day.

The project, named SIBELIUS-DARK, created a simulation that reaches out 600 million light-years from Earth, including 130 billion simulated particles. It was created using the DiRAC COSmology MAchine (COSMA) supercomputer from Durham University.

The simulation can help answer questions in cosmology, as well as visualize phenomena like dark matter by seeing the way it clumps into regions called halos. “The simulations simply reveal the consequences of the laws of physics acting on the dark matter and cosmic gas throughout the 13.7 billion years that our universe has been around,” explained one of the authors, Carlos Frenk of Durham University, in a statement.

The researchers worked on the simulation by using algorithms that reproduced our local area of the universe, centered on Earth, spreading out to cover our Milky Way and also nearby galaxies like the Andromeda galaxy. This was based on a model called the Cold Dark Matter model, which is a standard model in cosmology.

“The fact that we have been able to reproduce these familiar structures provides impressive support for the standard Cold Dark Matter model and tells us that we are on the right track to understand the evolution of the entire Universe,” said Frenk. Co-author Matthieu Schaller from Leiden University concurred, adding: “This project is truly ground-breaking. These simulations demonstrate that the standard Cold Dark Matter Model can produce all the galaxies we see in our neighbourhood. This is a very important test for the model to pass.”

The researchers now want to use the model to test cosmological models further, hoping to understand more about how the universe came to be the way it is. “By simulating our Universe, as we see it, we are one step closer to understanding the nature of our cosmos,” said lead author Stuart McAlpine of the University of Helsinki. This project provides an important bridge between decades of theory and astronomical observations.”

The research is published in the journal Monthly Notices of the Royal Astronomical Society.

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