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Dominique Aubert
The evolving shapes of the Epoch of Reionization : methods and simulations
15 octobre 2026 - 09:00Salle de conférences IRMA
The Epoch of Reionization (EoR) designates the first billion years of the Universe history. During these times, the first stars and galaxies produced ulraviolet radiations and X-rays that ionized the cosmic gas, leading to the fully ionized Universe that we know today. In particular, it is expected that the primeval spatial distribution of neutral gas and radiation should follow the large scale structures of the Universe, leading to a network of ionized bubbles colocated with the inital light emitters. The rise of these first emitting objects is currently under great scrutiny thanks to instruments such as the James Webb Space Telescope JWST or the upcoming Square Kilometer radio Array SKA. These distant times surely hold the keys to understand how current galaxies were formed and how they shaped the Universe for the subsequent 13 billion years.
At the Strasbourg Observatory, we have been involved in the theory and modelisation of the EoR physics for two decades. We developed numerical simulation tools, notably powered by GPUs to anwser the specific challenges posed by the Reionization. We also explored how machine learning techniques can be used to emulate the evolving geometry of the EoR. Finally, we applied and developped formalisms derived from large-scale structures topology to the specific case of EoR. I will present a synthesis of these developments, for which the physics of cosmic Reionization and its understanding acted as a constant and rich driver.
Dominique Aubert obtained his PhD at the Observatoire de Paris in 2005. After a postdoctoral position at the CEA in Saclay, he joined Strasbourg Observatory where he is now a professor. He is specialist of the reionisation of the universe focusing on numerical modeling and high perfomance computating. -
Pierre Kraemer
TBA
19 novembre 2026 - 09:00Salle de conférences IRMA
TBA