Séminaire / Seminar GReCO |
| « Harvesting primordial black holes from stochastic trees with FOREST » |
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Pierre Auclair |
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Starting with the basic principles of the stochastic inflation formalism
-- an effective theory for the long-wavelengths of quantum fields during inflation -- I introduce a novel framework to implement stochastic inflation on stochastic trees, modelling the inflationary expansion as a branching process. This new approach allows us to generate real-space maps of the curvature perturbation that fully capture quantum diffusion and its non-perturbative backreaction during inflation. Unlike lattice methods, trees do not proceed on a fixed background since new spacetime units emerge dynamically as trees unfold, naturally incorporating metric fluctuations. The usage of stochastic trees offers remarkable numerical efficiency, and I developed the FOrtran Recursive Exploration of Stochastic Trees (FOREST) tool to demonstrate the performance of this approach. I show how primordial black holes blossom at unbalanced nodes of the trees, and how their mass distribution can be obtained while automatically accounting for the "cloud-in-cloud" effect. |
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lundi 12 janvier 2026 - 14:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |