Cosmology with Void-Galaxy Correlations

Hamaus, Nico; Wandelt, B. D.; Sutter, P. M.; Lavaux, Guilhem; Warren, Michael S.

doi:10.1103/physrevlett.112.041304

Cited by 118 publications

(220 citation statements)

References 39 publications

(51 reference statements)

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“…A different cosmological test relies on the insensitivity of voids to nonlinear redshift space distortions. The varying bias levels studied here are relevant for redshift space distortions; in particular, the nearly unbiased void population may be useful in performing the AlcockPacynksi test (Alcock & Paczynski 1979) to constrain cosmology (Hamaus et al , 2015.…”

Section: Discussionmentioning

confidence: 99%

Clustering and bias measurements of SDSS voids

Clampitt

Jain

Sánchez

2016

Mon. Not. R. Astron. Soc.

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Using a void catalog from the SDSS survey, we present the first measurements of void clustering and the corresponding void bias. Over the range 30 − 200 Mpc/h the void auto-correlation is detected at 5σ significance for voids of radius 15 − 20 Mpc/h. We also measure the void-galaxy cross-correlation at higher signal-to-noise and compare the inferred void bias with the autocorrelation results. Void bias is constant with scale for voids of a given size, but its value falls from 5.6 ± 1.0 to below zero as the void radius increases from 15 to 30 Mpc/h. The comparison of our measurements with carefully matched galaxy mock catalogs, with no free parameters related to the voids, shows that model predictions can be reliably made for void correlations. We study the dependence of void bias on tracer density and void size with a view to future applications. In combination with our previous lensing measurements of void mass profiles, these clustering measurements provide another step towards using voids as cosmological tracers.

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Section: Discussionmentioning

confidence: 99%

Clustering and bias measurements of SDSS voids

Clampitt

Jain

Sánchez

2016

Mon. Not. R. Astron. Soc.

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“…Such a strong cosmic web dependent halo bias may play important roles in cosmological and galaxy formation probes. For instance, Hamaus et al (2014) proposed a method of using galaxy-void cross correlation to constrain cosmologies, the very different clustering behaviors of void halos found here must be properly taken into account in such kind of studies. On the other hand, as pointed out in ELUCID III, the fractions of red galaxies as functions of the r-band absolute magnitude depend very strongly on the cosmic web environments.…”

Section: Cosmic Web Dependent Halo Biasmentioning

confidence: 99%

“…The purpose of this work are two folded: (1) to see if the halo biases have significant cosmic web environmental dependence, which might be useful for cosmological probes (e.g. Hamaus et al 2014;Dai 2015;Hamaus et al 2016), and (2) to see if the age dependent halo assembly bias can be explained in terms of the cosmic web environmental dependence (e.g. Borzyszkowski et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Revealing the Cosmic Web-dependent Halo Bias

Yang

Zhang

et al. 2017

ApJ

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Halo bias is the one of the key ingredients of the halo models. It was shown at a given redshift to be only dependent, to the first order, on the halo mass. In this study, four types of cosmic web environments: clusters, filaments, sheets and voids are defined within a state of the art high resolution N -body simulation. Within those environments, we use both halo-dark matter cross-correlation and halo-halo auto correlation functions to probe the clustering properties of halos.

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“…The height of the compensation wall decreases with void size, causing the inner profile slope to become shallower and the wall to widen. This trend divides all voids into being either overcompensated or undercompensated, depending on whether the total mass within their compensation wall exceeds or falls behind their missing mass in the center, respectively [41]. Ultimately, at sufficiently large distances to the void center, all profiles approach the mean background density.…”

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confidence: 98%

Universal Density Profile for Cosmic Voids

2014

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We present a simple empirical function for the average density profile of cosmic voids, identified via the watershed technique in ΛCDM N -body simulations. This function is universal across void size and redshift, accurately describing a large radial range of scales around void centers with only two free parameters. In analogy to halo density profiles, these parameters describe the scale radius and the central density of voids. While we initially start with a more general four-parameter model, we find two of its parameters to be redundant, as they follow linear trends with the scale radius in two distinct regimes of the void sample, separated by its compensation scale. Assuming linear theory, we derive an analytic formula for the velocity profile of voids and find an excellent agreement with the numerical data as well. In our companion paper [Sutter et al., Mon. Not. R. Astron. Soc. 442, 462 (2014)] the presented density profile is shown to be universal even across tracer type, properly describing voids defined in halo and galaxy distributions of varying sparsity, allowing us to relate various void populations by simple rescalings. This provides a powerful framework to match theory and simulations with observational data, opening up promising perspectives to constrain competing models of cosmology and gravity. Introduction.-While tremendous effort has been conducted studying the properties of dark matter halos, cosmic voids have largely been unappreciated by the broad scientific community. However, as voids occupy the most underdense regions in the Universe, and constitute the dominant volume fraction of it, they are promising independent probes to test our theories of structure formation and cosmology. For example, voids are the ideal laboratories for studies of dark energy (e.g., Refs. [1-5]) and modified gravity (e.g., Refs. [6-9]), as the importance of ordinary gravitating matter is mitigated in their interior. Unlike dark matter halos, voids are in addition more closely related to the initial conditions of the Universe, thanks to the limited number of phase-space foldings occurring inside of them [10][11][12][13][14][15].A fundamental quantity to describe the structure of voids in a statistical sense is their spherically averaged density profile. In contrast to the well-known formulas parametrizing density profiles of simulated dark matter halos (e.g., Refs. [16][17][18][19]), rather few models for void density profiles have been developed, mainly focusing on the central regions [3,[20][21][22][23], rarely taking into account the compensation walls outside the void [24]. In this Letter we present a simple formula that is able to accurately describe the density profile around voids of any size and redshift, out to large distances from their center. Although we focus our attention on dark matter simulations here, our companion paper [25] extends the analysis to voids defined in other tracer types, such as dark matter halos and mock galaxies of various number densities, yielding consistent results. Thus, give...

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Cosmology with Void-Galaxy Correlations

Cited by 118 publications

References 39 publications

Clustering and bias measurements of SDSS voids

Clustering and bias measurements of SDSS voids

Revealing the Cosmic Web-dependent Halo Bias

Universal Density Profile for Cosmic Voids

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