Here is a hypothesis on the JWST high-z galaxy tension
Came across this paper on the JWST high-redshift galaxy tension and thought it was an interesting read for people here.
The main idea is that the tension may actually involve two separate issues:
- whether enough massive halos form early enough, and
- whether there is enough cosmic time for stellar assembly and chemical enrichment.
The paper argues that smooth early dark energy may help with the halo-abundance side of the problem, but may not fully solve the stellar-maturity side. It also argues that simple time-remapping ideas run into trouble because of the observed (1+z) cosmological time-dilation relation.
It uses JADES-GS-z14-0 as a case study and tries to separate what is really a cosmology problem from what may still be an early-star-formation problem.
Curious what people here think: is the harder remaining issue now baryonic physics, or is there still a real cosmology problem underneath this?