Dominique Aubert
Univ. Strasbourg (Strasbourg, France)
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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| « Simulations and models of the cosmic reionization evolution » |
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Dominique Aubert |
| During the epoch of reionization, the hydrogen gas in the Universe experienced a global transition from a neutral to an ionized state. This process is often depicted as an evolving network of HII regions, seeded by the first sources of UV radiation (first galaxies and AGNs) and leading to the percolation of ionized « bubbles » 1 billion years after Big Bang, at a redshift z~6. The details of the reionization scenario depends on the properties of the high-redshift galaxies and intergalactic medium, for which current and upcoming experiments such as JWST or SKA will greatly advance our understanding. In this context, models and simulations of the reionisation have been developed. Because of the interplay between galactic and cosmological scales, plus the central role played by light-matter interactions, these developments came with their unique sets of challenges. This is a task faced by many dedicated groups worldwide and among them, our group in Strasbourg, with a focus on accelerated and hybrid computing. For example I will show how the study of reionization pushed for the advent of accelerated cosmological simulation codes. I will also discuss how deep learning techniques were used to complement simulations, emulate the reionisation process and interpret the radio signal of the IGM . Finally I will show how these developments triggered new descriptions of the reionization process, based on the topology and the geometry of the spatial distribution of reionization times. |
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vendredi 9 février 2024 - 11:00 Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |