Measuring the anisotropic stress with relativistic effects

Daniel Sobral Blanco, Isaac Tutusaus and Camille Bonvin


The large-scale structure of the Universe is a powerful source of information to test the consistency of General Relativity on cosmological scales. In this talk, I will discuss how the observed distribution of galaxies is affected by redshift-space distortions, but also gravitational lensing and other relativistic effects. I will then discuss how we can use one of the latter, called gravitational redshift, to build a test that directly measures the anisotropic stress without relying on any assumption about the dynamics of the unknown dark matter.