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The BAHAMAS project: Effects of dynamical dark energy on large-scale structure | | Simon Pfeifer
; Ian G. McCarthy
; Sam G. Stafford
; Shaun T. Brown
; Andreea S. Font
; Juliana Kwan
; Jaime Salcido
; Joop Schaye
; | | Date: |
16 Apr 2020 | | Abstract: | 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 | | Source: | arXiv, 2004.7670 | | Services: | Forum | Review | PDF | Favorites | |
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