Kavli Affiliate: Hu Zhan
| First 5 Authors: Jun-Qian Jiang, Weiyang Liu, Hu Zhan, Bin Hu,
| Summary:
Recent observations from the James Webb Space Telescope (JWST) have uncovered
massive galaxies at high redshifts, with their abundance significantly
surpassing expectations. This finding poses a substantial challenge to both
galaxy formation models and our understanding of cosmology. Additionally,
discrepancies between the Hubble parameter inferred from high-redshift cosmic
microwave background (CMB) observations and those derived from low-redshift
distance 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 a
universal Salpeter initial mass function to fit the luminosity function derived
from JWST data, as well as other cosmological probes, including the CMB, baryon
acoustic oscillations (BAO), and the SH0ES local distance ladder. Our findings
indicate that JWST observations favor a high energy fraction of EDE, $
f_text{EDE} sim 0.2 pm 0.03 $, and a high Hubble constant value of $ H_0
sim 74.6 pm 1.2 $ km/s/Mpc, even in the absence of SH0ES data. This suggests
that EDE not only addresses the $ H_0 $ tension but also provides a compelling
explanation for the observed abundance of massive galaxies identified by JWST.
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