Speaker
Prof.
Helene Courtois
(University Lyon 1)
Description
I will present research focused on measuring the peculiar (gravitational) velocities of galaxies. The goal is to achieve a three-dimensional reconstruction of the velocity field of the Local Universe, which reflects the distribution of both dark and luminous matter. This approach enables us to determine local values of fsigma_8 , H0 , and the local bulk flow, using these as key tests of the ΛCDM model and the underlying theory of dark matter. In addition, this work has allowed us to identify superclusters as basins of gravitation — including Laniakea, the supercluster in which we reside, and its five nearest neighboring superclusters.
