Primordial Perturbations, Early Evolution and Dark Matter in the Universe

Abstract

The problem of primordial cosmological perturbations which gave birth to the large scale structure of the universe is analysed from the time of their origin up to the nonlinear formation of the structure. We show how classical gravity accounts for the generation of perturbations near the beginning of the cosmological expansion. Dark matter which governs the further development of perturbations in the early universe includes both heavy and light weakly interacting particles. Transfer functions of the adiabatic and isothermal modes of perturbations are investigated and some astrophysical applications are given.