70 AIM, UMR 7158, CEA/DRF, CNRS, Université Paris Diderot, Irfu/Service d'Astrophysique,
Centre de Saclay, FR-91191 Gif-sur-Yvette, France

Throughout the Universe many powerful events are driven by strong gravitational effects that
require general relativity to fully describe them. These include compact binary mergers …

We construct a three-dimensional, fully relativistic numerical model of a universe filled with
an inhomogeneous pressureless fluid, starting from initial data that represent a perturbation …

In numerical relativity simulations with non-trivial matter configurations, one must solve the
Hamiltonian and momentum constraints of the ADM formulation for the metric variables in …

The demand to obtain answers to highly complex problems within strong-field gravity has
been met with significant progress in the numerical solution of Einstein's equations—along …

We perform (3+ 1)-dimensional simulations of primordial black hole (PBH) formation starting
from the spheroidal superhorizon perturbations. We investigate how the ellipticity …

We perform the numerical simulation of primordial black hole (PBH) formation from a
nonspherical profile of the initial curvature perturbation ζ. We consider the background …

A persistent theme in the study of dark energy is the question of whether it really exists or
not. It is often claimed that we are mis-calculating the cosmological model by neglecting the …

Standard cosmological models rely on an approximate treatment of gravity, utilizing
solutions of the linearized Einstein equations as well as physical approximations. In an era …

How does inhomogeneity affect our interpretation of cosmological observations? It has long
been wondered to what extent the observable properties of an inhomogeneous universe …