Speaker: Cornelius Rampf
I show how to obtain the relativistic displacement field which is needed for example to obtain the initial conditions for quasi-relativistic N-body simulations. I will report on current work about how to interpret these relativistic non-linear constraints within N-body simulations. In particular, I identify the longitudinal part of the relativistic displacement field as a non-Gaussian modification of the density and velocity configurations, and the transverse part of the relativistic displacement field as a frame dragging, seen in an observer’s frame. The key technique for that analysis is the Lagrangian perturbation theory which I will also review in this talk.