Seminarium Teorii Względności i Grawitacji

Cosmological structure formation is usually modelled with the standard perturbation theory which has restricted domain of applicability, the main restrictions being a small density contrast and a non-relativistic velocities. Alternatively, exact solutions of Einstein's field equations can be employed, however their integrability usually requires some high degree of symmetry which makes them unrealistic. In my talk I will present two methods, the silent universe model (a dust model with no gravitational waves) and the relativistic Zel'dovich approximation (1st order solution to the Lagrangian perturbation scheme), that partially circumvent these problems and are well suited to describe relativistic dynamics with initial conditions defined only in a statistical sense. Talk is also broadcasted via zoom