Location: Texas Symposium, Cape Town.
The concordance model, LCDM, is based on 3 main ingredients: a FLRW background, relativistic perturbation theory to trap sell flections on large scales, e.g. the CMB, and Newtonian N-body simulations (or non-linear Newtonian perturbation theory) to study the nonlinear growth of inhomogeneities in large scale structure. Observational cosmology has now reached a ~% level precision, and upcoming galaxy surveys aim at similar precision. In view of this, it is worth investigating GR effects in large scale structure. In this talk I will briefly review some results obtained with the application of numerical relativity to solve exactly Einstein Equations in the cosmological context, and I will talk about possible synergies with the study of exact solutions and with approximation methods.