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The BAHAMAS project: Effects of dynamical dark energy on large-scale structure

Pfeifer, S, McCarthy, IG, Stafford, SG, Brown, ST, Font, AS, Kwan, J, Salcido, J and Schaye, J (2020) The BAHAMAS project: Effects of dynamical dark energy on large-scale structure. Monthly Notices of the Royal Astronomical Society, 498 (2). pp. 1576-1592. ISSN 0035-8711

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In this work we consider the impact of spatially-uniform but time-varying dark energy (or `dynamical dark energy', DDE) on large-scale structure in a spatially flat universe, using large cosmological hydrodynamical simulations that form part of the BAHAMAS project. As DDE changes the expansion history of the universe, it impacts the growth of structure. We explore variations in DDE that are constrained to be consistent with the cosmic microwave background. We find that DDE can affect the clustering of matter and haloes at the ~10% level (suppressing it for so-called `freezing' models, while enhancing it for `thawing' models), which should be distinguishable with upcoming large-scale structure surveys. DDE cosmologies can also enhance or suppress the halo mass function (with respect to LCDM) over a wide range of halo masses. The internal properties of haloes are minimally affected by changes in DDE, however. Finally, we show that the impact of baryons and associated feedback processes is largely independent of the change in cosmology and that these processes can be modelled separately to typically better than a few percent accuracy

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.CO; astro-ph.CO; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 30 Jul 2020 11:40
Last Modified: 04 Sep 2021 07:14
DOI or ID number: 10.1093/mnras/staa2240
URI: https://researchonline.ljmu.ac.uk/id/eprint/13023
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