http://arxiv.org/abs/2208.11471
Early observations with JWST have led to the discovery of an unexpected large density (stellar mass density $\rho_\approx 10^{6}\,M_{\odot}\,Mpc^{-3}$) of massive galaxies (stellar masses $M_\geq 10^{10.5}M_{\odot}$) at extremely high redshifts $z\approx 10$. We show that – under the most conservative assumptions, and independently of the baryon physics involved in galaxy formation – such abundance is not only in tension with the standard $\Lambda$CDM cosmology, but provides extremely tight constraints on the expansion history of the Universe and on the growth factors corresponding to a wide class of Dark Energy (DE) models. The constraints we derive rule out with high ($>2\sigma$) confidence level a major portion of the parameter space of Dynamical DE models allowed (or even favoured) by existing cosmological probes.
N. Menci, M. Castellano, P. Santini, et. al.
Thu, 25 Aug 22
35/43
Comments: 5 pages, submitted for publication in the Astrophysical Journal Letters
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