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Speaker: Julien Carron (UNIGE) – Title: Delensing the Cosmic Microwave Background
October 22 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: October 22, 2024
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Julien Carron (UNIGE)
Title: Delensing the Cosmic Microwave Background
Abstract: Gravitational lensing of the Cosmic Microwave Background is a very valuable cosmological signal, detected at very high significance by several experiments. At the same time, it has also become an hindrance to some important science goals of CMB experiments, most notably for best constraints on a primordial background of gravitational waves. After reviewing current lensing estimation techniques and recent results, I’ll discuss how removal of the lensing signal (`delensing’) typically helps measuring small parameters that affects the CMB polarization. Very sensitive experiments must rely on novel more powerful algorithms to optimally extract or remove the lensing signal: I will present the approach developed in our group in Geneva, together with its forecast performance for upcoming experiments, notably CMB-S4.
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