Seminarium Kosmologia i Fizyka Cząstek

We present a possible way of indirect probing of thePlanck scale effects by the cosmological observations.Our considerations base on loop quantum cosmology (LQC) which is the symmetry reduced model of loop quantum gravity. We show how the standard phase of cosmic inflation is naturally realized within LQC. We consider generation of gravitational waves in this model. Based on this, we present the way to relate LQC effects with observations of the cosmic microwave background radiation (CMB). In particular, we investigate the possible LQC effects on the B-type polarization of the CMB. We confront the theoretical predictions with the available observational data and indicate the possible constraints on the Planck scale physics. We discuss perspectives and limitations of the proposed approach.