Speaker
Description
Cosmological observations are well described by the LCDM model, a universe with a cold dark matter component and a cosmological constant acting as dark energy. However, more and more cosmological tensions have emerged in the past decades, putting this simple model into question. A large amount of research has focused on the quest for an alternative model of modified gravity and dark energy, but no consensus has been reached. Model-independent tests of gravity can help us to identify viable models while keeping the computational cost of data analysis minimal. In this talk, I will focus on the Weyl potential evolution, a model-independent observable tracking the combined gravitational potential Ψ + Φ. I will present a measurement of this quantity obtained using galaxy-galaxy lensing and galaxy clustering data from the Dark Energy Survey. I will also highlight how, in combination with redshift-space distortions, this new observable can help us to disentangle different alternative models.