Dynamics of voids and their shapes in redshift space

Maeda, Kei Ichi; Sakai, Nobuyuki; Triay, R.

doi:10.1088/1475-7516/2011/08/026

Cited by 9 publications

(8 citation statements)

References 73 publications

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“…Voids are the large, underdense regions that occupy a large fraction of the volume of the Universe and are a natural consequence of the hierarchical growth of structure (Hausman et al 1983;Thompson & Gregory 2011). While peculiar velocities modestly affect void shapes (Ryden & Melott 1996;Maeda et al 2011;, voids avoid the regions of high velocity dispersion that have such a large impact on the redshiftspace correlation function and power spectrum. Indeed, modeling of peculiar velocities in voids is particularly straightforward since they are still in the quasi-linear regime.…”

Section: Introductionmentioning

confidence: 99%

A First Application of the Alcock-Paczynski Test to Stacked Cosmic Voids

Sutter

Lavaux

Wandelt

et al. 2012

ApJ

174

303

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We report on the first application of the Alcock-Paczynski test to stacked voids in spectroscopic galaxy redshift surveys. We use voids from the Sutter et al. (2012) void catalog, which was derived from the Sloan Digital Sky Survey Data Release 7 main sample and luminous red galaxy catalogs. The construction of that void catalog removes potential shape measurement bias by using a modified version of the ZOBOV algorithm and by removing voids near survey boundaries and masks. We apply the shape-fitting procedure presented in to ten void stacks out to redshift z = 0.36. Combining these measurements, we determine the mean cosmologically induced "stretch" of voids in three redshift bins, with 1σ errors of 5-15%. The mean stretch is consistent with unity, providing no indication of a distortion induced by peculiar velocities. While the statistical errors are too large to detect the Alcock-Paczynski effect over our limited redshift range, this proof-ofconcept analysis defines procedures that can be applied to larger spectroscopic galaxy surveys at higher redshifts to constrain dark energy using the expected statistical isotropy of structures that are minimally affected by uncertainties in galaxy velocity bias.

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Section: Introductionmentioning

confidence: 99%

A First Application of the Alcock-Paczynski Test to Stacked Cosmic Voids

Sutter

Lavaux

Wandelt

et al. 2012

ApJ

174

303

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“…where in order to derive Eq. (25) we have used the fact that V 1 (but its derivatives need not be small) and χ ≡ Y ,r . Hence, the difference in the local expansion due to a change of frame can be expressed as follows, Figure 4 shows the difference between the two expansions H B and H DM at z = 0 for the solutions whose density contrast are depicted with red and blue lines in Fig.…”

Section: Local Expansion Of the Componentsmentioning

confidence: 99%

“…As revealed by these reviews and references therein: (i) cosmic voids enclose only 15% of cosmic matter-energy (within the ΛCDM paradigm) but cona e-mail: ismaeldg@icf.unam.mx b e-mail: hidalgo@icf.unam.mx c e-mail: sussman@nucleares.unam.mx stitute about 77% of cosmic volume; (ii) they form from early negative density contrast perturbations; (iii) they roughly keep their rounded shape and (iv) their dynamics is relatively insensitive to considerations from baryon physics. This relatively simple and pristine dynamics renders them as ideal structure systems to improve the theoretical modeling of generic cosmological observations [9][10][11], and to assess several open problems in cosmology: the nature of dark matter and dark energy [12][13][14][15][16][17][18][19][20][21], redshift space distortions [22][23][24][25], Cosmic Microwave Background (CMB) properties [26][27][28][29][30], Baryonic Acoustic Oscillations (BAO) [31], alternative gravity theories [32][33][34][35][36][37], local group kinematics and peculiar velocity fields [38][39][40][41][42][43][44], as well as theoretical issues such as gravitational entropy [45,46].…”

Section: Introductionmentioning

confidence: 99%

Non-comoving baryons and cold dark matter in cosmic voids

2019

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We examine the fully relativistic evolution of cosmic voids constituted by baryons and cold dark matter (CDM), represented by two non-comoving dust sources in a ΛCDM background. For this purpose, we consider numerical solutions of Einstein's field equations in a fluid-flow representation adapted to spherical symmetry and multiple components. We present a simple example that explores the frame-dependence of the local expansion and the Hubble flow for this mixture of two dusts, revealing that the relative velocity between the sources yields a significantly different evolution in comparison with that of the two sources in a common 4-velocity (which reduces to a Lemaître-Tolman-Bondi model). In particular, significant modifications arise for the density contrast depth and void size, as well as in the amplitude of the surrounding over-densities. We show that an adequate model of a frame-dependent evolution that incorporates initial conditions from peculiar velocities and large-scale density contrast observations may contribute to understand the discrepancy between the local value of H 0 and that inferred from the CMB.

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“…Attention was also drawn to galaxy properties within voids ⋆ E-mail:marcus.werner@ipmu.jp (e.g., the void phenomenon of Peebles (2001)). Now, with the advent of the ΛCDM paradigm, detailed numerical studies of void statistics (e.g., Colberg et al (2005) for a comparison) and analytical studies of void shape evolution in redshift space (e.g., Maeda, Sakai & Triay (2011)) have been conducted. Moreover, the void formation theory based on the excursion set formalism of primordial density fluctuations has been refined to include the notion of hierarchy (Sheth & van de Weygaert (2004)).…”

Section: Introductionmentioning

confidence: 99%

On de Sitter geometry in cosmic void statistics

Gibbons¹,

Werner²,

Yoshida³

et al. 2013

Monthly Notices of the Royal Astronomical Society

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Starting from the geometrical concept of a 4-dimensional de-Sitter configuration of spheres in Euclidean 3-space and modelling voids in the Universe as spheres, we show that a uniform distribution over this configuration space implies a power-law for the void number density which is consistent with results from the excursion set formalism and with data, for an intermediate range of void volumes. The scaling dimension of the large scale structure can be estimated as well. We also discuss the effect of restricting the survey geometry on the void statistics. This work is a new application of de-Sitter geometry to cosmology and also provides a new geometrical perspective on self-similarity in cosmology.

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Dynamics of voids and their shapes in redshift space

Cited by 9 publications

References 73 publications

A First Application of the Alcock-Paczynski Test to Stacked Cosmic Voids

A First Application of the Alcock-Paczynski Test to Stacked Cosmic Voids

Non-comoving baryons and cold dark matter in cosmic voids

On de Sitter geometry in cosmic void statistics

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