Seminario D. Paoletti

Il giorno 16 gennaio allre ore 14,30 presso l'aula 412, Daniela Paoletti (INAF Bologna) terra un seminario dal titolo

Abstract

Relic magnetic fields generated in the primordial Universe may represent the seeds for the generation of the magnetic fields observed today on cosmological scales in galaxies, clusters, filaments and voids. Such Primordial Magnetic Fields (PMFs) can be generated through different mechanisms in the early Universe and their presence and characteristics would represent a peculiar probe of the fundamental physics in the early Universe like during inflation and phase transitions. Magnetic fields generated prior to recombination leave unavoidable imprints on the Cosmic Microwave Background which represents the best lab to investigate the nature of primordial magnetism. After presenting the observational and theoretical scenario of cosmic magnetism and the relevance of PMFs, I'll describe the main imprints of PMFs on CMB anisotropies with particular interests for the E and B polarizations. I will then show the most updated constraints on PMFs from Planck 2018 data and the forecasts for LiteBIRD and its combination with ground based CMB experiments.Cosmic Magnetism and the CMB