Cosmological observational tests in the JWST Era. I: angular size - redshift

TL;DR

This paper analyzes galaxy sizes at high redshifts using JWST data to test cosmological models, finding size evolution consistent with the standard {DM} model and little evolution in static models.

Contribution

It provides observational evidence for galaxy size evolution at high redshift, supporting the {DM} cosmology over static models.

Findings

Galaxy sizes evolve with redshift in {DM} model

Static models show negligible size evolution

Results support standard cosmological model

Abstract

This study is devoted to the cosmological "angular size - redshift" test. An analysis is performed of the angular and linear sizes of galaxies from the new ASTRODEEP-JWST catalogue, which contains over 500,000 objects at high redshifts (up to ~20 photometrically determined and up to ~14 spectroscopically determined). For the calculations, 6 860 galaxies with reliably determined spectroscopic redshifts and 319,771 galaxies with known photometric redshifts were used. The linear sizes of galaxies were computed within the framework of two cosmological models - the standard ({\Lambda}CDM) model and one of the static models (the so-called "tired light" model). We have shown that within the framework of the {\Lambda}CDM model, a significant evolution of the linear sizes of galaxies is observed, with the rate of the evolution closely matching the rate of the cosmic expansion. In contrast, in the static model, the characteristic linear sizes of galaxies exhibit almost no evolution with increasing z.