Speaker: Hedda Gressel

With increasing precision in cosmology, higher order effects gain an important role. Standard n-body simulations use Newtonian gravitational dynamics on an expanding background, which only take the Newtonian scalar potential into account. The General Relativity description, on the other hand, includes scalar, vector, and tensor perturbations. At first order, the Newtonian approach seems to be sufficient for results of significant value. At second order, however, relativistic contributions arise and need to be taken into account.
In this talk, I will give a brief introduction to perturbation theory and will discuss relativistic effects in higher order solutions of the density contrast.