Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

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dc.contributor.authorCorrea, Carlos M.
dc.contributor.authorPaz, Dante J.
dc.contributor.authorSanchez, Ariel G.
dc.contributor.authorRuiz, Andres N.
dc.contributor.authorPadilla, Nelson D.
dc.contributor.authorAngulo, Raul E.
dc.date.accessioned2025-01-20T23:55:39Z
dc.date.available2025-01-20T23:55:39Z
dc.date.issued2021
dc.description.abstractVoids are promising cosmological probes. Nevertheless, every cosmological test based on voidsmust necessarily employ methods to identify them in redshift space. Therefore, redshift-space distortions (RSD) and the Alcock-Paczynski effect (AP) have an impact on the void identification process itself generating distortion patterns in observations. Using a spherical void finder, we developed a statistical and theoretical framework to describe physically the connection between the identification in real and redshift space. We found that redshift-space voids above the shot noise level have a unique real-space counterpart spanning the same region of space, they are systematically bigger and their centres are preferentially shifted along the line of sight. The expansion effect is a by-product of RSD induced by tracer dynamics at scales around the void radius, whereas the off-centring effect constitutes a different class of RSD induced at larger scales by the global dynamics of the whole region containing the void. The volume of voids is also altered by the fiducial cosmology assumed to measure distances, this is the AP change of volume. These three systematics have an impact on cosmological statistics. In this work, we focus on the void size function. We developed a theoretical framework to model these effects and tested it with a numerical simulation, recovering the statistical properties of the abundance of voids in real space. This description depends strongly on cosmology. Hence, we lay the foundations for improvements in current models of the abundance of voids in order to obtain unbiased cosmological constraints from redshift surveys.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/staa3252
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/staa3252
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95102
dc.identifier.wosidWOS:000599134600065
dc.issue.numero1
dc.language.isoen
dc.pagina.final925
dc.pagina.inicio911
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectmethods: data analysis
dc.subjectmethods: statistical
dc.subjectgalaxies: distances and redshifts
dc.subjectcosmological parameters
dc.subjectlarge-scale structure of Universe
dc.titleRedshift-space effects in voids and their impact on cosmological tests. Part I: the void size function
dc.typeartículo
dc.volumen500
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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