Forconi, M. orcid.org/0000-0003-4754-3689, Giarè, W. orcid.org/0000-0002-4012-9285, Mena, O. et al. (4 more authors) (2024) A double take on early and interacting dark energy from JWST. Journal of Cosmology and Astroparticle Physics, 2024. 097.
Abstract
The very first light captured by the James Webb Space Telescope (JWST) revealed a population of galaxies at very high redshifts more massive than expected in the canonical ΛCDM model of structure formation. Barring, among others, a systematic origin of the issue, in this paper, we test alternative cosmological perturbation histories. We argue that models with a larger matter component Ωm and/or a larger scalar spectral index ns can substantially improve the fit to JWST measurements. In this regard, phenomenological extensions related to the dark energy sector of the theory are appealing alternatives, with Early Dark Energy emerging as an excellent candidate to explain (at least in part) the unexpected JWST preference for larger stellar mass densities. Conversely, Interacting Dark Energy models, despite producing higher values of matter clustering parameters such as σ8, are generally disfavored by JWST measurements. This is due to the energy-momentum flow from the dark matter to the dark energy sector, implying a smaller matter energy density. Upcoming observations may either strengthen the evidence or falsify some of these appealing phenomenological alternatives to the simplest ΛCDM picture.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2024 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
Keywords: | high redshift galaxies; dark energy theory; physics of the early universe |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 28 May 2024 11:22 |
Last Modified: | 28 May 2024 13:45 |
Published Version: | http://dx.doi.org/10.1088/1475-7516/2024/05/097 |
Status: | Published |
Publisher: | IOP Publishing |
Refereed: | Yes |
Identification Number: | 10.1088/1475-7516/2024/05/097 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:212811 |
Download
Filename: Forconi_2024_J._Cosmol._Astropart._Phys._2024_097 (1).pdf
Licence: CC-BY 4.0