High-redshift JWST Observations and Primordial Non-Gaussianity

TL;DR

This paper explores how primordial non-Gaussianity in initial cosmological conditions could explain the existence of unexpectedly massive galaxies observed at high redshifts by JWST, challenging standard cosmological models.

Contribution

It investigates the role of primordial non-Gaussianity in accounting for early massive galaxies, offering a potential explanation for recent JWST observations.

Findings

Primordial non-Gaussianity can increase the abundance of massive high-redshift galaxies.

Standard $\Lambda$CDM predictions struggle to explain observed galaxy masses without non-Gaussianity.

The paper identifies conditions under which non-Gaussianity aligns models with observations.

Abstract

Several bright and massive galaxy candidates at high redshifts have been recently observed by the James Webb Space Telescope. Such early massive galaxies seem difficult to reconcile with standard $\Lambda$ Cold Dark Matter model predictions. We discuss under which circumstances such observed massive galaxy candidates can be explained by introducing primordial non-Gaussianity in the initial conditions of the cosmological perturbations.