Speaker: Marco Bruni
Location: invited talk at the meeting GE@75 for the 75th birthday of George F. R. Ellis, Cape Town
Following up from George’s talk “Cosmology then and now”, in this talk I will first present my perspective on “Cosmology and General Relativity then” as a student entering these fields of research. Then I will make a few comments on my main contributions to non-linear studies in cosmology, starting with my first paper with George, i.e. the use of the covariant fluid approach to study cosmological perturbations. Application of dynamical system theory, silent universes, non-linear gauge transformations are other examples. I will end up with my present work on initial conditions for simulations in the matter era, again an application of the equations of the covariant approach, and my new post-Friedmann framework to study cosmological inhomogeneities on all scales.