Primordial black holes are a dark matter candidate, which may originate from strong perturbations created during inflation. These perturbations can be studied using the formalism of stochastic inflation. I present a numerical approach to this problem, where the stochastic dynamics is solved by generating a large number of random realizations. This makes it possible to go beyond analytical approximations and take into account additional effects such as backreaction between the perturbations and the background. I show that in an example model with an inflection point potential and ultra-slow-roll inflation, compatible with CMB measurements, stochastic effects produce a highly non-Gaussian tail for the perturbations, which changes the predictions for black hole production significantly.
Dates:
Mardi, 26 janvier, 2021 - 14:00 to 15:00
Localisation / Location:
APC
Salle / Local:
https://u-paris.zoom.us/j/87016236807?pwd=SkJNU0Q1d1lYU1BxZzlvZXpKblkzQT09
- Séminaire
Nom/Prénom // Last name/First name:
Eemeli Tomberg
Affiliation:
NICPB
Equipe(s) organisatrice(s) / Organizing team(s):
- Théorie
Pays / Country:
Estonia