The polarization of the cosmic microwave background radiation (CMB) is the next frontier in observational cosmology. Data on CMB polarization is of great interest both from a cosmological viewpoint (due to its signatures of gravitational waves in the $B$ mode, as a test of dark energy, etc.) as well as from the astrophysical viewpoint (reionization, properties of galaxy clusters and of the intra-cluster media, etc.) Recently, we have shown (Abramo & Xavier, 2006) that a causal formalism in real space can be used to describe how the initial cosmological fluctuations end up generating polarization of the CMB. In this Research Project we will extend this causal formalism to include three effects that affect CMB polarization: 1) recombination, 2) reionization, and 3) weak gravitational lensing from large-scale structure.
News published in Agência FAPESP Newsletter about the scholarship: