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Void Dynamics

Published online by Cambridge University Press:  12 October 2016

Nelson D. Padilla ,
Dante Paz ,
Marcelo Lares ,
Laura Ceccarelli ,
Diego Garcí a Lambas ,
Yan-Chuan Cai  and
Baojiu Li
Nelson D. Padilla
Affiliation:
Instituto de Astrofí sica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl Centro de Astro-Ingenierí a, Universidad Católica de Chile
Dante Paz
Affiliation:
Instituto de Astrofí sica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl Instituto de Astronomí a Teórica y Experimental (IATE), Laprida 922, Córdoba, Argentina
Marcelo Lares
Affiliation:
Instituto de Astrofí sica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl Instituto de Astronomí a Teórica y Experimental (IATE), Laprida 922, Córdoba, Argentina
Laura Ceccarelli
Affiliation:
Instituto de Astrofí sica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl Instituto de Astronomí a Teórica y Experimental (IATE), Laprida 922, Córdoba, Argentina
Diego Garcí a Lambas
Affiliation:
Instituto de Astrofí sica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl Instituto de Astronomí a Teórica y Experimental (IATE), Laprida 922, Córdoba, Argentina
Yan-Chuan Cai
Affiliation:
Instituto de Astrofí sica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl Institute for Computational Cosmology Durham University South Road, Durham, DH1 3LE, UK
Baojiu Li
Affiliation:
Instituto de Astrofí sica, Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile email: npadilla@astro.puc.cl Institute for Computational Cosmology Durham University South Road, Durham, DH1 3LE, UK
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Abstract

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Cosmic voids are becoming key players in testing the physics of our Universe.Here we concentrate on the abundances and the dynamics of voids as these are among the best candidatesto provide information on cosmological parameters. Cai, Padilla & Li (2014)use the abundance of voids to tell apart Hu & Sawicki f(R) models from General Relativity. An interestingresult is that even though, as expected, voids in the dark matter field are emptier in f(R) gravity due to the fifth force expellingaway from the void centres, this result is reversed when haloes are used to find voids. The abundance of voids in this casebecomes even lower in f(R) compared to GR for large voids. Still, the differences are significant and thisprovides a way to tell apart these models. The velocity field differences between f(R) and GR, on the other hand, arethe same for halo voids and for dark matter voids.Paz et al. (2013), concentrate on the velocity profiles around voids. First they show the necessityof four parameters to describe the density profiles around voids given two distinct voidpopulations, voids-in-voids and voids-in-clouds. This profile is used to predict peculiar velocities around voids,and the combination of the latter with void density profiles allows the construction of modelvoid-galaxy cross-correlation functions with redshift space distortions. When these modelsare tuned to fit the measured correlation functions for voids and galaxies in the SloanDigital Sky Survey, small voids are found to be of the void-in-cloud type, whereas largerones are consistent with being void-in-void. This is a novel result that is obtaineddirectly from redshift space data around voids. These profiles can be used toremove systematics on void-galaxy Alcock-Pacinsky tests coming from redshift-space distortions.

Keywords

Cosmic VoidsCosmologyLarge Scale Structure of the UniversePeculiar velocities

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