Cosmic neutrino background (CNB) and cosmic microwave background (CMB) are the oldest particles in the universe. These remnants glow from the early universe (big bang time) have traveled for more than 13.6 billion years. Along their trip, they have been faced by many interactions and have picked up various tales about the history of universe and interactions from beyond the standard models of particles. One of the ways the CMB tells a story is through its polarization. However, in the case of CMB polarizations, we are aware that the distribution of new interactions (new physics) is smaller than the distribution of the standard model interactions. In the other hands, many international teams are working to measure temperature fluctuations and the polarization of cosmic background radiation with the highest possible accuracy. This fact can give everyone hope that by increasing the accuracy of experimental observations of CMB polarizations, better constraints can be placed on physics beyond the standard model.
In this lecture, we study the possibility to find some evidences for the nature of neutrinos and dark matter by increasing the accuracy of experimental data on the polarization of cosmic background radiation.