Cosmology with gravitational lensing of the Cosmic Microwave Background
by Louis Legrand (ICTP-SAIFR)
Abstract:
The Cosmic Microwave Background (CMB) is the most distant light that we can observe today. Since its emission roughly 380.000 years after the Big Bang it crossed all the Universe while coming to us. During their travel, the photons of the CMB have been gravitational lensed by the matter they encountered along their path. This deflection of the CMB is a powerful observable, proportional to the integral of the matter distribution up to the early Universe. I will introduce how we can reconstruct this deflection field from observations of the CMB. I will then demonstrate how CMB lensing can put tight constraints on the content of the Universe, on the sum of the neutrino masses, and how delensing the CMB will help us discover cosmic inflation. Lastly, I will introduce a new CMB lensing estimator, which will reconstruct optimally the lensing field for the next generation of CMB surveys.
Short-Bio:
I did my PhD at the Université Paris Saclay in France, under the supervision of Nabila Aghanim and Marian Douspis. I then did a post doc at the University of Geneva and now I am a post doc at ICTP-SAIFR. I am interested in probing the large scale structures of the Universe, focusing in particular on reconstructing the gravitational lensing of the CMB. I am also member of the Euclid and CMB-S4 collaborations.
Google Meet: https://meet.google.com/pcw-gmem-jyi
Link da transmissão: https://www.youtube.com/c/AstronomiaIAGUSP/live