GRChombo is an open-source code for performing Numerical Relativity time evolutions,
built on top of the publicly available Chombo software for the solution of PDEs. Whilst …

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 …

We introduce Hi-COLA, a code designed to run fast, approximate N-body simulations of non-
linear structure formation in reduced Horndeski gravity. Given an input Lagrangian, Hi-COLA …

It is a well-known fact that, in the absence of dark matter, the observation of the rotation
curves of galaxies cannot be explained in terms of Newtonian gravity. Rotation curves …

We present a numerical weak-lensing analysis that is fully relativistic and non-perturbative
for the scalar part of the gravitational potential and first order in the vector part, frame …

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 …

Measurements of the cosmic redshift drift—the change in redshift of a source over time—will
enable independent detection of cosmological expansion thanks to the immense precision …

Relativistic cosmology can be formulated covariantly, but in dealing with numerical relativity
simulations a gauge choice is necessary. Although observables should be gauge-invariant …

GRDzhadzha is an open-source code for relativistic simulations of matter fields on curved
spacetimes that admit an analytic description (eg stationary black holes). It is based on the …

We investigate the transverse modes of the gravitational and velocity fields in Λ cold dark
matter, based on a high-resolution simulation performed using the adaptive-mesh …