High-Redshift Galaxies from Early JWST Observations: Constraints on Dark Energy Models

Abstract

Early observations with JWST have led to the discovery of an unexpected large density (stellar mass density ${\rho }_{\ast }\approx 10^6{M}_{\odot }Mp{c}^{-3}$) of massive galaxies (stellar masses $M_{\ast }\ge 10^{10.5}{M}_{\odot }$) 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.

5 pages. Accepted for publication in the Astrophysical Journal Letters. arXiv admin note: text overlap with arXiv:2007.12453

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