Introductory overview

• Vincent Vennin (APC Paris)

The stochastic-delta N formalism

• David Wands

Quantum diffusion and PBHs

• Chris Pattison

Stochastic inflation in phase space

• Julien Grain (Institut d'Astrophysique Spatiale)

APC theory talk: General relativistic weak-field limit and Newtonian N-body simulations

• Kazuya Koyama

Abstract: Future galaxy surveys such as Euclid, LSST and SKA will cover larger and larger scales where general relativistic effects become important. On the other hand, our study of large scale structure still relies on Newtonian N-body simulations. I show how standard Newtonian N-body simulations can be interpreted in terms of the weak-field limit of general relativity. Our framework allows the inclusion of radiation perturbations and the non-linear evolution of matter. I show how to construct the weak-field metric by combining Newtonian simulations with results from Einstein-Boltzmann codes. I discuss observational effects on weak lensing and ray tracing, identifying important relativistic corrections. Finally, I briefly discuss recent developments of GR simulations in cosmology.

Turning in the landscape: a new mechanism for generating Primordial Black Holes

• Jacopo Fumagalli feat Lukas Witkowski (IAP)

PBHs from the preheating instability

• Lucas Pinol (Institut d'Astrophysique de Paris)