[en] This document contains Power Point presentations and texts of the contributions to a meeting held in video-conference. The first day addresses issues related to astro-particles and cosmology. After an introduction about the relationship between physics and cosmology, the authors propose information and presentations of various research activities, installations and programs related to nuclear physics and particle physics: the Vera-C.-Rubin observatory (previously named Large Synoptic Survey Telescope or LSST), DESI (a project related to dark energy), the synergies between LSST and Euclid, presentation of the Simons/S4 observatory, presentation of the project of participation to Litebird, presentation of the 'gravitational waves' research group, project of participation to LISA, information about 'Advanced Virgo +' on the way towards the Einstein Telescope.