[astroseminar at Sapienza] Seminar by Marco Gatti, today at 16.00 in aula Conversi, Sapienza

[Roberto Maoli]

Dear Colleagues,

This is a gentle reminder for the seminar by Marco Gatti, today at 16.00 
in aula Conversi (details below).

All the best

Roberto


Title: Weak Lensing Non-Gaussian Statistics in the era of precision 
Cosmology
Speaker: Marco Gatti
Institution: Department of Physics and Astronomy, University of 
Pennsylvania, Philadelphia, PA 19104, USA
Date: Thursday December 14, 2023
Time: 4:00PM
Location: Aula Conversi, Marconi Building (CU013), Dept. of Physics, 
Sapienza University

Meet link: https://meet.google.com/szf-gndu-pwc

Abstract: The statistical analysis of lensed galaxies is a powerful tool 
to study the dark matter distribution of the Universe. For
instance, the distortion of galaxy shapes induced by the large-scale 
structure of the Universe can be used to reconstruct the projected
matter density along the line-of-sight (mass maps). Mass maps are useful 
as they provide a wealth of information that goes beyond and
complements the more traditional two-point statistics used in Cosmology. 
During this seminar, I will show the Dark Energy Survey
year 3 mass maps, which are the largest curved-sky galaxy weak lensing 
mass maps to date. Next, I will discuss the current state-of-the-art
in non-Gaussian analyses applied to weak lensing mass maps. I will 
present an end-to-end simulation-based inference (SBI) framework that
allows us to use common non-Gaussian statistics (e.g., higher order 
moments, peaks, scattering transform, phase wavelet harmonics) to
constraints cosmological parameters. I will then show constraints on 
data using the Dark Energy Survey year 3 weak lensing data. Last, I
will be discussing the impact of observational systematics, and the main 
challenges ahead in view of stage IV surveys.

web: https://agenda.infn.it/event/38597/

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  Roberto  Maoli                        		 Tel: (39) 06 49 914 050
  Dip. Fisica - Univ. di Roma "La Sapienza"     	 Fax: (39) 06 49 914 690
  Piazzale Aldo Moro 2                e-mail: roberto.maoli at roma1.infn.it
  00185 Roma - ITALIA

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