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.
| Language | English |
|---|---|
| Pages | 4861-4877 |
| Number of pages | 17 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 479 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1 Oct 2018 |
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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 journal › Article
TY - JOUR
T1 - Cosmic voids in evolving dark sector cosmologies
T2 - Monthly Notices of the Royal Astronomical Society
AU - Adermann,Eromanga
AU - Elahi,Pascal J.
AU - Lewis,Geraint F.
AU - Power,Chris
PY - 2018/10/1
Y1 - 2018/10/1
N2 - 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.
AB - 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.
KW - Cosmology: observations
KW - Cosmology: theory
KW - dark energy
KW - Dark matter
KW - Large-scale structure of universe
UR - http://www.scopus.com/inward/record.url?scp=85051553404&partnerID=8YFLogxK
U2 - 10.1093/mnras/sty1824
DO - 10.1093/mnras/sty1824
M3 - Article
VL - 479
SP - 4861
EP - 4877
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 4
ER -