James Webb Space Telescope Feed Post

Arxiv: Explanation of high redshift luminous galaxies from JWST by early dark energy model Published: 9/30/2024 7:39:05 AM Updated: 9/30/2024 7:39:05 AM

Paper abstract: Recent observations from the James Webb Space Telescope (JWST) have uncoveredmassive galaxies at high redshifts, with their abundance significantlysurpassing expectations. This finding poses a substantial challenge to bothgalaxy formation models and our understanding of cosmology. Additionally,discrepancies between the Hubble parameter inferred from high-redshift cosmicmicrowave background (CMB) observations and those derived from low-redshiftdistance ladder methods have led to what is known as the ``Hubble tension''.Among the most promising solutions to this tension are Early Dark Energy (EDE)models. In this study, we employ an axion-like EDE model in conjunction with auniversal Salpeter initial mass function to fit the luminosity function derivedfrom JWST data, as well as other cosmological probes, including the CMB, baryonacoustic oscillations (BAO), and the SH0ES local distance ladder. Our findingsindicate that JWST observations favor a high energy fraction of EDE, f_\text{EDE} ~ 0.2 \pm 0.03 , and a high Hubble constant value of H_0~ 74.6 \pm 1.2 km/s/Mpc, even in the absence of SH0ES data. This suggeststhat EDE not only addresses the H_0 tension but also provides a compellingexplanation for the observed abundance of massive galaxies identified by JWST.