Cosmic voids in evolving dark sector cosmologies: The high-redshift universe

Eromanga Adermann, Pascal J. Elahi, Geraint F. Lewis, Chris Power

Research output: Contribution to journalArticle

Abstract

We compare the evolution of voids formed under the standard cosmological model and two alternative cosmological models. The two models are a quintessence model and a Coupled Dark Matter-Dark Energy model, both of which have evolving and interacting dark sectors. From N-body adiabatic hydrodynamical simulations of thesemodels, we measure the statistics and quantify the properties of voids over the redshift range z = 1.5-12: these include their population size, volumes, shapes, and average densities. We find that the latter property has potential as a probe of cosmology, particularly dark energy, as significant differences in average void densities exist between the alternative models and the standard model. We postulate that this signature arises from an increased evacuation rate of particles out of voids, or an earlier start to void evacuation, in the alternative models as a direct consequence of the dynamical scalar field, which also leads to greater void merger rates. Additionally, differences between the two alternative models are likely due to the drag force arising from dark sector coupling, acting on dark matter particles in our coupled model.

LanguageEnglish
Pages4861-4877
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume479
Issue number4
DOIs
Publication statusPublished - 1 Oct 2018

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void
voids
sectors
universe
dark energy
dark matter
axioms
drag
cosmology
merger
signatures
statistics
energy
population size
scalars
probe
probes
simulation

Cite this

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abstract = "We compare the evolution of voids formed under the standard cosmological model and two alternative cosmological models. The two models are a quintessence model and a Coupled Dark Matter-Dark Energy model, both of which have evolving and interacting dark sectors. From N-body adiabatic hydrodynamical simulations of thesemodels, we measure the statistics and quantify the properties of voids over the redshift range z = 1.5-12: these include their population size, volumes, shapes, and average densities. We find that the latter property has potential as a probe of cosmology, particularly dark energy, as significant differences in average void densities exist between the alternative models and the standard model. We postulate that this signature arises from an increased evacuation rate of particles out of voids, or an earlier start to void evacuation, in the alternative models as a direct consequence of the dynamical scalar field, which also leads to greater void merger rates. Additionally, differences between the two alternative models are likely due to the drag force arising from dark sector coupling, acting on dark matter particles in our coupled model.",
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Cosmic voids in evolving dark sector cosmologies : The high-redshift universe. / Adermann, Eromanga; Elahi, Pascal J.; Lewis, Geraint F.; Power, Chris.

In: Monthly Notices of the Royal Astronomical Society, Vol. 479, No. 4, 01.10.2018, p. 4861-4877.

Research output: Contribution to journalArticle

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