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Insights from HST into Ultramassive Galaxies and Early-Universe Cosmology

Kamionkowski, Marc; Muñoz, Julian B.; Sabti, Nashwan

The early-science observations made by the James Webb Space Telescope (JWST) have revealed an excess of ultramassive galaxy candidates that appear to challenge the standard cosmological model (Λ CDM ). Here, we argue that any modifications to Λ CDM that can produce such ultramassive galaxies in the early Universe would also affect the UV galaxy lu…