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The first billion years after the Big Bang poses many open questions: How and when the first stars and galaxies were formed? How does the interplay between baryonic and dark matter physics determine the properties of these objects and evolve them with time into the galaxies, stars and black holes observed today? In this talk, I will present the latest Hubble Space Telescope observations of galaxies in the first billion years and discuss how the evolution of their luminosity function can be linked to the dynamical assembly of dark matter halos. Modeling the connection between dark and light not only complements observations by unveiling widespread star formation below the current detection limits, but it also inspires the design of future investigations aimed at characterizing the earliest forming galaxies in the young Universe. |
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