Dark matter at high redshifts with JWST

          @misc{ scivideos_PIRSA:24020071,
            doi = {10.48660/24020071},
            url = {https://pirsa.org/24020071},
            author = {Munoz, Julian},
            keywords = {Cosmology},
            language = {en},
            title = {Dark matter at high redshifts with JWST},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2024},
            month = {feb},
            note = {PIRSA:24020071 see, \url{https://scivideos.org/pirsa/24020071}}
          }
          

Abstract

The launch of the James Webb Space Telescope (JWST) has ignited a revolution in our understanding of the early universe. Its exquisite infrared capabilities have allowed observers to find galaxies at higher redshifts than before and to measure their stellar masses. I will describe how we can use these observations to shed light on the nature of dark matter. For the JWST galaxies to form they ought to reside in dark-matter halos, allowing us to measure the clustering of dark matter in an unexplored region. I will discuss the JWST observations of ultra-massive galaxies recently argued to “break LCDM”, and how we recently disfavored a cosmological solution using HST data at the same redshifts. If time allows, I will review the path forward to measuring dark-matter clustering down to the first galaxies through 21-cm observations.