Explosion du big bang dans l'espace

They made the largest and most detailed model of the early universe

The story of the universe started ago about 13.8 billion years old with a big bang. This phenomenon gave birth to the universe suddenly and dramatically. Soon after, this nascent universe started to cool and darken. A few hundred million years later, it then woke up. The gravity then start with act on materials who attract and gather together. Of this cosmic agglomeration the first stars are born and, subsequently, the many galaxies.

From a certain time, neutral hydrogen emitted by these primitive stars ionized and transformed into hot plasma. The Universe then begins to become transparent to these new photon particles which have become visible sources of light. These new sources of stellar light diffuse light rays through the cosmos without them being absorbed.

That crucial transformationknown as cosmic reionizationbrought the universe out of its dark ages and is considered a cosmological rebirth.

American-developed software simulates cosmic dawn

The astrologers from the Massachusetts Institute of Technology, Harvard University and the Max Planck Institute for Astrophysics, worked together to develop a simulation detail of how the universe developed during this pivotal period. In particular, they succeeded in reconstructing the largest and most complete model of the primitive universe thanks to a software baptized Thesan, after the Etruscan goddess of the dawn.

This program was designed to simulate the “cosmic dawn”, and more specifically cosmic reionization. This period in the history of the Universe was particularly difficult to reconstruct. Indeed, it involves interactions cosmic extremely chaotic and complicatedbetween gravity, gas and radiation.

Thesan helps astrophysicists understand cosmological phenomena

the Thesan software enabled scientists to to understand these complex interactions thanks to a much more detailed and voluminous simulation than the previous ones. It is based on a very realistic model of galaxy formation combined with a cosmic dust model. Everything integrates a new algorithm able to predict how light interacts with gas.

Thanks to Thesan, the researchers were able to simulate a cubic volume of the universe extending over 300 million light years. They have advances the simulation from around 400,000 years after the Big Bang to track the first appearance and evolution of hundreds of thousands of galaxies.

These simulations remain those used by astronomers around the world to study the early universe. They help in particular to place spatial observations in their cosmic contexts or to shed light on certain complex processes.


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