The search for solutions of Einstein's equations representing relativistic cosmological
models with a discrete matter content has been remarkably fruitful in the last decade. In this …

The measurements of the Hubble constant reveal a tension between high-redshift (CMB)
and low-redshift (distance ladder) constraints. So far neither observational systematics nor …

Most cosmological data analysis today relies on the Friedmann-Lemaître-Robertson-Walker
(FLRW) metric, providing the basis of the current standard cosmological model. Within this …

We perform large-scale cosmological simulations that solve Einstein's equations directly via
numerical relativity. Starting with initial conditions sampled from the cosmic microwave …

We assess the dominant low-redshift anisotropic signatures in the distance-redshift relation
and redshift drift signals. We adopt general-relativistic irrotational dust models allowing for …

Cosmological models typically neglect the complicated nature of the spacetime mani-fold at
small scales in order to hypothesize idealized general relativistic solutions for describing the …

We present GRAMSES, a new pipeline for nonlinear cosmological N-body simulations in
General Relativity (GR). This code adopts the Arnowitt-Deser-Misner (ADM) formalism of …

We investigate the importance of local gravity during preheating, the nonlinear dynamics
that may be responsible for starting the process of reheating the Universe after inflation. We …

We present the halo number counts and its two-point statistics, the observable angular
power spectrum, extracted for the first time from relativistic N-body simulations. The halo …

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 …