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research article

Cosmic void exclusion models and their impact on the distance scale measurements from large-scale structure

Variu, Andrei  
•
Zhao, Cheng  
•
Forero-Sanchez, Daniel  
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March 23, 2023
Monthly Notices Of The Royal Astronomical Society

Baryonic Acoustic Oscillations (BAOs) studies based on the clustering of voids and matter tracers provide important constraints on cosmological parameters related to the expansion of the Universe. However, modelling the void exclusion effect is an important challenge for fully exploiting the potential of this kind of analyses. We thus develop two numerical methods to describe the clustering of cosmic voids. Neither model requires additional cosmological information beyond that assumed within the galaxy de-wiggled model. The models consist in power spectra whose performance we assess in comparison to a parabolic model on Patchy cubic and light-cone mocks. Moreover, we test their robustness against systematic effects and the reconstruction technique. The void model power spectra and the parabolic model with a fixed parameter provide strongly correlated values for the Alcock-Paczynski (alpha) parameter, for boxes and light-cones likewise. The resulting alpha values - for all three models - are unbiased and their uncertainties are correctly estimated. However, the numerical models show less variation with the fitting range compared to the parabolic one. The Bayesian evidence suggests that the numerical techniques are often favoured compared to the parabolic model. Moreover, the void model power spectra computed on boxes can describe the void clustering from light-cones as well as from boxes. The same void model power spectra can be used for the study of pre- and post-reconstructed data-sets. Lastly, the two numerical techniques are resilient against the studied systematic effects. Consequently, using either of the two new void models, one can more robustly measure cosmological parameters.

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Type
research article
DOI
10.1093/mnras/stad813
Web of Science ID

WOS:000961536600011

Author(s)
Variu, Andrei  
Zhao, Cheng  
Forero-Sanchez, Daniel  
Chuang, Chia-Hsun
Kitaura, Francisco-Shu
Tao, Charling
Tamone, Amelie  
Kneib, Jean-Paul  
Date Issued

2023-03-23

Publisher

OXFORD UNIV PRESS

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

521

Issue

3

Start page

4731

End page

4749

Subjects

Astronomy & Astrophysics

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methods: data analysis

•

methods: numerical

•

methods: statistical

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software: simulations

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large-scale structure of universe

•

cosmology: observations

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baryon acoustic-oscillations

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cosmological structure formation

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structure catalogs

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redshift-space

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data releases

•

final data

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galaxies

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reconstruction

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systematics

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efficient

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
Available on Infoscience
May 8, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/197495
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