Classicalization and Observational signatures of cosmological fluctuations

Abstract

Since the discovery of cosmic microwave background (CMB) predictions and measurements of this background have been improved. In this project the interaction of a quantum system, which is weakly coupled to an environment, during inflation is discussed. This environment leads to the classicalization of the quantum behavior of the initial system. The quantum system during inflation can be described by the Schwinger-Keldysh formalism together with the 2PI-formalism. In the end the self-masses are calculated, which is the first step of solving the equations of motion for the statistical propagator. These solutions could give more information over the spectrum of the CMB.