Cosmic voids in evolving dark sector cosmologies: the low-redshift universe

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

Research output: Contribution to journalArticle

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Abstract

We present a comparison of void properties between the standard model of cosmology, Lambda cold dark matter (Lambda CDM) and two alternative cosmological models with evolving and interacting dark sectors: a quintessence model (phi CDM) and a coupled dark matter-dark energy (CDE) model. Using N-body simulations of these models, we derive several measures of void statistics and properties, including distributions of void volume, ellipticity, prolateness and average density. We find that the volume distribution derived from the CDE simulation deviates from the volume distribution derived from the Lambda CDM simulation in the present-day universe, suggesting that the presence of a coupled dark sector could be observable through this statistic. We also find that the distributions of void ellipticity and prolateness are practically indistinguishable among the three models over the redshift range z = 0.0-1.0, indicating that simple void shape statistics are insensitive to small changes in dark sector physics. Interestingly, we find that the distributions of average void density measured in each of the three simulations are distinct from each other. In particular, voids on average tend to be emptiest under a quintessence model, and densest under the Lambda CDM model. Our results suggest that it is the scalar field present in both alternative models that causes emptier voids to form, while the coupling of the dark sector mitigates this effect by slowing down the evacuation of matter from voids.

Original languageEnglish
Pages (from-to)3381-3394
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume468
Issue number3
DOIs
Publication statusPublished - Jul 2017

Cite this

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title = "Cosmic voids in evolving dark sector cosmologies: the low-redshift universe",
abstract = "We present a comparison of void properties between the standard model of cosmology, Lambda cold dark matter (Lambda CDM) and two alternative cosmological models with evolving and interacting dark sectors: a quintessence model (phi CDM) and a coupled dark matter-dark energy (CDE) model. Using N-body simulations of these models, we derive several measures of void statistics and properties, including distributions of void volume, ellipticity, prolateness and average density. We find that the volume distribution derived from the CDE simulation deviates from the volume distribution derived from the Lambda CDM simulation in the present-day universe, suggesting that the presence of a coupled dark sector could be observable through this statistic. We also find that the distributions of void ellipticity and prolateness are practically indistinguishable among the three models over the redshift range z = 0.0-1.0, indicating that simple void shape statistics are insensitive to small changes in dark sector physics. Interestingly, we find that the distributions of average void density measured in each of the three simulations are distinct from each other. In particular, voids on average tend to be emptiest under a quintessence model, and densest under the Lambda CDM model. Our results suggest that it is the scalar field present in both alternative models that causes emptier voids to form, while the coupling of the dark sector mitigates this effect by slowing down the evacuation of matter from voids.",
keywords = "dark energy, dark matter, large-scale structure of Universe, DIGITAL SKY SURVEY, BARYON ACOUSTIC-OSCILLATIONS, PARAMETER CONSTRAINTS, SPHERICAL EVOLUTION, GALACTIC SATELLITES, ENERGY COSMOLOGIES, GALAXY SURVEYS, DATA RELEASES, MATTER HALOS, LOCAL GROUP",
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year = "2017",
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doi = "10.1093/mnras/stx657",
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Cosmic voids in evolving dark sector cosmologies : the low-redshift universe. / Adermann, Eromanga; Elahi, Pascal J.; Lewis, Geraint F.; Power, Chris.

In: Monthly Notices of the Royal Astronomical Society, Vol. 468, No. 3, 07.2017, p. 3381-3394.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Cosmic voids in evolving dark sector cosmologies

T2 - the low-redshift universe

AU - Adermann, Eromanga

AU - Elahi, Pascal J.

AU - Lewis, Geraint F.

AU - Power, Chris

PY - 2017/7

Y1 - 2017/7

N2 - We present a comparison of void properties between the standard model of cosmology, Lambda cold dark matter (Lambda CDM) and two alternative cosmological models with evolving and interacting dark sectors: a quintessence model (phi CDM) and a coupled dark matter-dark energy (CDE) model. Using N-body simulations of these models, we derive several measures of void statistics and properties, including distributions of void volume, ellipticity, prolateness and average density. We find that the volume distribution derived from the CDE simulation deviates from the volume distribution derived from the Lambda CDM simulation in the present-day universe, suggesting that the presence of a coupled dark sector could be observable through this statistic. We also find that the distributions of void ellipticity and prolateness are practically indistinguishable among the three models over the redshift range z = 0.0-1.0, indicating that simple void shape statistics are insensitive to small changes in dark sector physics. Interestingly, we find that the distributions of average void density measured in each of the three simulations are distinct from each other. In particular, voids on average tend to be emptiest under a quintessence model, and densest under the Lambda CDM model. Our results suggest that it is the scalar field present in both alternative models that causes emptier voids to form, while the coupling of the dark sector mitigates this effect by slowing down the evacuation of matter from voids.

AB - We present a comparison of void properties between the standard model of cosmology, Lambda cold dark matter (Lambda CDM) and two alternative cosmological models with evolving and interacting dark sectors: a quintessence model (phi CDM) and a coupled dark matter-dark energy (CDE) model. Using N-body simulations of these models, we derive several measures of void statistics and properties, including distributions of void volume, ellipticity, prolateness and average density. We find that the volume distribution derived from the CDE simulation deviates from the volume distribution derived from the Lambda CDM simulation in the present-day universe, suggesting that the presence of a coupled dark sector could be observable through this statistic. We also find that the distributions of void ellipticity and prolateness are practically indistinguishable among the three models over the redshift range z = 0.0-1.0, indicating that simple void shape statistics are insensitive to small changes in dark sector physics. Interestingly, we find that the distributions of average void density measured in each of the three simulations are distinct from each other. In particular, voids on average tend to be emptiest under a quintessence model, and densest under the Lambda CDM model. Our results suggest that it is the scalar field present in both alternative models that causes emptier voids to form, while the coupling of the dark sector mitigates this effect by slowing down the evacuation of matter from voids.

KW - dark energy

KW - dark matter

KW - large-scale structure of Universe

KW - DIGITAL SKY SURVEY

KW - BARYON ACOUSTIC-OSCILLATIONS

KW - PARAMETER CONSTRAINTS

KW - SPHERICAL EVOLUTION

KW - GALACTIC SATELLITES

KW - ENERGY COSMOLOGIES

KW - GALAXY SURVEYS

KW - DATA RELEASES

KW - MATTER HALOS

KW - LOCAL GROUP

U2 - 10.1093/mnras/stx657

DO - 10.1093/mnras/stx657

M3 - Article

VL - 468

SP - 3381

EP - 3394

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -