Early Galaxies from Rare Inflationary Processes and JWST Observations

TL;DR

This paper explores how rare Poisson processes during cosmic inflation can produce localized overdense regions, leading to early galaxy formation detectable by JWST, offering a novel explanation for high-redshift galaxies.

Contribution

It introduces a new mechanism involving rare Poisson processes during inflation that can produce early, dense overdense regions, potentially observable by JWST.

Findings

Overdense regions collapse earlier than standard models predict.

Galaxies from these regions can be detected by JWST and future surveys.

The model remains consistent with existing cosmological constraints.

Abstract

Rare Poisson processes (PP) during cosmic inflation can lead to signatures that are localized in position space and are not well captured by the standard two- or higher-point correlation functions of primordial density perturbations. As an example, PP can lead to localized overdense regions that are far denser than the ones produced through standard inflationary fluctuations. As a result, such overdense regions collapse earlier than expected based on the standard $\Lambda$CDM model and would host anomalously high-redshift galaxies. We describe some general aspects of such PP and consider a particular realization in the context of inflationary particle production. We then show that the masses and redshifts of the resulting galaxies can lie in a range discoverable by the James Webb Space Telescope (JWST) and future surveys, while being consistent with existing constraints on the matter power spectrum and UV luminosity functions at lower redshifts.