Orateur
Description
The problems within the standard cosmological model have sparked the research of alternatives and possible solutions and one way to tackle these problems is to question the validity of General Relativity (GR) as the correct theory of gravitation on cosmological scales, entering the context of modified gravity (MG) theories. In this work, we studied a specific MG model known as f(R) gravity, in the Hu & Sawicki formulation. Stage IV surveys studying the Large-scale Scale Structure (LSS), like the Dark Energy Spectroscopic Instrument (DESI) the Legacy Survey of Space and Time (LSST), or Euclid, will provide accurate weak lensing measurements to shed light on the most fundamental aspects of gravity and its effects on structures formation. Cosmological information on LSS is extracted primarily with two-point estimators. However, the clustering of matter due to gravitational collapse may introduce non-Gaussianities in matter distribution, for which standard statistics might not be optimal. For this purpose, we used a set of higher-order statistics measured on convergence maps, which are sensitive to non-Gaussian features in LSS, to discriminate between cosmological models and to assess their sensitivity to different behaviors of gravity during structure formation.
