2011
DOI: 10.1088/1475-7516/2011/08/026
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Dynamics of voids and their shapes in redshift space

Abstract: We investigate the dynamics of a single spherical void embedded in a Friedmann-Lemaȋtre universe, and analyze the void shape in the redshift space. We find that the void in the redshift space appears as an ellipse shape elongated along the line of sight (i.e., an opposite deformation to the Kaiser effect). Applying this result to observed void candidates at the redshift z ∼ 1-2, it may provide us with a new method to evaluate the cosmological parameters, in particular the value of a cosmological con… Show more

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Cited by 9 publications
(8 citation statements)
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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%
“…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%
“…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%
“…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%