Scientists develop the largest, most detailed model of the early universe to date
It all started around 13.8 billion years ago with a big, cosmological"bang" that brought the universe suddenly and spectacularly into existence. Shortly after, the infant universe cooled dramatically and went completely dark.Then, within a couple hundred million years after the Big Bang, the universe woke up, as gravity gathered matter into the first stars and galaxies.
The Thesan simulation resolves these interactions with the highest detail and over the largest volume of any previous simulation. It does so by combining a realistic model of galaxy formation with a new algorithm that tracks how light interacts with gas, along with a model for cosmic dust. "Thesan acts as a bridge to the early universe," says Aaron Smith, a NASA Einstein Fellow in MIT's Kavli Institute for Astrophysics and Space Research."It is intended to serve as an ideal simulation counterpart for upcoming observational facilities, which are poised to fundamentally alter our understanding of the cosmos."
"Thesan follows how the light from these first galaxies interacts with the gas over the first billion years and transforms the universe from neutral to ionized," Kannan says."This way, we automatically follow the reionization process as it unfolds." "We are bridging these two approaches: We have both large volume and high resolution," Vogelsberger emphasizes.
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