[astroseminar at Sapienza] seminar by Marco Gatti, Thursday Dec 14 at 16.00 in aula Conversi, Sapienza

[Roberto Maoli]

Dear Colleagues,

I am writing to advertise the following seminar by Marco Gatti (details 
below).
I kindly invite you to forward the information to interested students 
and colleagues.

Have a good day

Roberto

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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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