CosmoStat Calendar

slides:
https://docs.google.com/presentation/d/1LRJqN8Eb7-g-tlDmRaEJV7yd77FQ5PO01HK53YaTscU/edit?usp=sharing

zoom link:
https://cnrs.zoom.us/j/97784959178?pwd=Z0NqaVR0RmMyNFNFdDR3NHRwUWREZz09

Title:
Higher Order Weak Lensing Statistics in Euclid

Abstract:

The Higher-Order Weak Lensing Statistics (HOWLS) key-project aims to improve the extraction of cosmological information encoded into the cosmic shear data in the Euclid mission. Infact, by evaluating an
etherogenous pletora of higher-order statistics (HOSs) sensitive both to
the Gaussian and non-Gaussian content of this field, the constraints on
the cosmological parameters can be significantly improved with respect
to the classical 2-point estimators (only decoding the Gaussian
information).

The talk will be structured in three parts as follows:

1) Firstly, I will present the most important results of the first HOWLS
paper where 10 different HOSs has been measured on non-tomographic
Euclid-like data. Individually, each HOS demonstrates a twofold increase
in Fisher forecast precision over two-point statistics. When combined, a
4.5 times improvement is observed, emphasizing the significant potential
of HOS for Euclid's cosmic shear analysis.

2) Secondly, I will introduce the work currently undergoing for the
second paper of the HOWLS series in which the analysis will be made more
realistic thanks to a tomographic approach and to the usage of realistic
masks. We will test the tomographic HOSs performances making use of a
reasonable fixed number of bins in both equi-populated and equi-distant
configuration tailoring our mocks in a DR1-like and DR3-like setup. We
will also validate the Kaiser-Squire reconstruction pipeline using
tomography as well as in presence of masked pixels. Finally, we will
evaluate the impact of the masks application on the HOSs precision by
computing the Fisher bias. This non-trivial process is showing many
caveats which have to be faced properly.

3) In this third and last step, I will describe the future steps of the
HOWLS project towards the Euclid-DR1.