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Statut |
Confirmé |
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Série |
IJCLAB-COSM |
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Domaines |
gr-qc |
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Date |
Mercredi 18 Septembre 2024 |
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Heure |
14:00 |
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Institut |
IJCLAB |
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Salle |
210/1-114 - Salle des Séminaires |
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Nom de l'orateur |
Artigas |
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Prenom de l'orateur |
Danilo |
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Addresse email de l'orateur |
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Institution de l'orateur |
Kyoto University |
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Titre |
Non-linear treatment of cosmological perturbations |
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Résumé |
Linear-perturbation theory has proven to be an extremely powerful tool to compare inflationary models with
observational data. Recently, the newcoming high-precision observations call for predictions beyond linear
perturbations. Such effects are known to be relevant for example in the production of primordial black holes
or scalar-induced gravitational waves.
The separate-universe approach proposes to capture some of these non-linearities. It describes the universe
as a set of causally disconnected homogeneous and isotropic patches (FLRW). In this talk, I will show that by
allowing the patches to exhibit constant curvature, the separate-universe approach can be extended to non-
slow-roll models. I will discuss the case of ultra-slow roll where this new approach allows to correctly predict
the power spectrum of scalar perturbations together with non-Gaussianities. |
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Numéro de preprint arXiv |
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Commentaires |
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Fichiers attachés |
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