A Zeldovich reconstruction method for measuring redshift space distortions using cosmic voids

Nadathur, Seshadri; Carter, Paul; Percival, Will J.

doi:10.1093/mnras/sty2799

Cited by 34 publications

(79 citation statements)

References 74 publications

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“…Our model for the void-galaxy cross-correlation has previously been extensively tested using this mock galaxy sample in the full cubic simulation box with periodic boundary conditions [25,26]. To account for survey edge effects, we create a single 'CMASS-like' mock catalogue from this cubic box.…”

Section: N -Body Mocksmentioning

confidence: 99%

“…The anisotropic galaxy distribution around cosmic voids can also be used as an Alcock-Paczynski test [17], and to measure the growth rate [18][19][20][21][22][23][24][25][26][27][28]. As voids are regions of low density, if the void is large enough to dominate over environmental effects from nearby structures, the average galaxy velocity in the void vicinity is directed outwards from the void centre.…”

Section: Introductionmentioning

confidence: 99%

“…We perform our joint analysis using a multipole decomposition of the void-galaxy correlation in configuration space. Recent theoretical advances in modelling these multipoles [21,25,26] have been shown to provide an accurate description of the cross-correlation in redshift space on all scales. The description of these multipole moments uses linear perturbation theory dynamics and a convolution due to dispersion in galaxy velocities around the coherent mean outflow [25].…”

Section: Introductionmentioning

confidence: 99%

“…The description of these multipole moments uses linear perturbation theory dynamics and a convolution due to dispersion in galaxy velocities around the coherent mean outflow [25]. However, a significant complication has been noted, arising from additional unmodelled RSD terms due to the motion of void centres themselves [25,26,35]. This work is the first to make use of the large-scale velocity field reconstruction technique to remove the effects of void centre motions as proposed in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Beyond BAO: Improving cosmological constraints from BOSS data with measurement of the void-galaxy cross-correlation

et al. 2019

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We present a measurement of the anisotropic void-galaxy cross-correlation function in the CMASS galaxy sample of the BOSS DR12 data release. We perform a joint fit to the data for redshift space distortions (RSD) due to galaxy peculiar velocities and anisotropies due to the Alcock-Paczynski (AP) effect, for the first time using a velocity field reconstruction technique to remove the complicating effects of RSD in the void centre positions themselves. Fits to the void-galaxy function give a 1% measurement of the AP parameter combination DA(z)H(z)/c = 0.4367±0.0045 at redshift z = 0.57, where DA is the angular diameter distance and H the Hubble parameter, exceeding the precision obtainable from baryon acoustic oscillations (BAO) by a factor of ∼ 3.5 and free of systematic errors. From voids alone we also obtain a 10% measure of the growth rate, f σ8(z = 0.57) = 0.501 ± 0.051. The parameter degeneracies are orthogonal to those obtained from galaxy clustering. Combining void information with that from BAO and galaxy RSD in the same CMASS sample, we measure DA(0.57)/rs = 9.383 ± 0.077 (at 0.8% precision), H(0.57)rs = (14.05 ± 0.14) 10 3 kms −1 Mpc −1 (1%) and f σ8 = 0.453 ± 0.022 (4.9%), consistent with cosmic microwave background (CMB) measurements from Planck. These represent a factor ∼ 2 improvement in precision over previous results through the inclusion of void information. Fitting a flat cosmological constant ΛCDM model to these results in combination with Planck CMB data, we find up to an 11% reduction in uncertainties on H0 and Ωm compared to use of the corresponding BOSS consensus values. Constraints on extended models with non-flat geometry and a dark energy of state that differs from w = −1 show an even greater improvement.

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Section: N -Body Mocksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beyond BAO: Improving cosmological constraints from BOSS data with measurement of the void-galaxy cross-correlation

et al. 2019

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“…As a consequence of their low matter content, voids become dominated by dark energy at early times, and so are sensitive to its nature (Lee & Park 2009;Lavaux & Wandelt 2012;Bos et al 2012;Pisani et al 2015). The dynamics within voids can be accurately modelled by linear perturbation theory even on small scales (Cai et al 2016;Nadathur & Percival 2019;Nadathur et al 2019a), which provides a unique opportunity to measure the growth rate of structure through redshift-space distortions (RSD) in the distribution of galaxies around voids (some examples of these studies in survey data include Hamaus et al 2016;Hawken et al 2017;Achitouv et al 2017;Nadathur et al 2019b). A recent analysis by Nadathur et al (2019b) of the redshift-space void-galaxy correlation observed in the Baryon Oscillation Spectroscopic survey (BOSS; Dawson et al 2013) showed that in combination with galaxy clustering, this method reduces the uncertainty in the measurement of cosmological distance scales by 50% compared to previous results arXiv:1911.08475v2 [astro-ph.CO] 21 Jan 2020 based on baryon acoustic oscillations (Alam et al 2017).…”

Section: Introductionmentioning

confidence: 99%

The Gravitational Lensing Signatures of BOSS Voids in the Cosmic Microwave Background

Raghunathan

Nadathur

Sherwin

et al. 2020

ApJ

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We report a 5.3σ detection of the gravitational lensing effect of cosmic voids from the Baryon Oscillation Spectroscopic (BOSS) Data Release 12 seen in the Planck 2018 cosmic microwave background (CMB) lensing convergence map. To make this detection, we introduce new optimal techniques for void stacking and filtering of the CMB maps, such as binning voids by a combination of their observed galaxy density and size to separate those with distinctive lensing signatures. We calibrate theoretical expectations for the void-lensing signal using mock catalogs generated in a suite of 108 full-sky lensing simulations from Takahashi et al. (2017). Relative to these templates, we measure the lensing amplitude parameter in the data to be A L = 1.10 ± 0.21 using a matched-filter stacking technique, and confirm it using an alternative Wiener filtering method. We demonstrate that the result is robust against thermal Sunyaev-Zel'dovich contamination and other sources of systematics. We use the lensing measurements to test the relationship between the matter and galaxy distributions within voids, and show that the assumption of linear bias with a value consistent with galaxy clustering results is discrepant with observation at ∼ 3σ; we explain why such a result is consistent with simulations and previous results, and is expected as a consequence of void selection effects. We forecast the potential for void-CMB lensing measurements in future data from the Advanced ACT, Simons Observatory and CMB-S4 experiments, showing that, for the same number of voids, the achievable precision improves by a factor of more than two compared to Planck.Unified Astronomy Thesaurus concepts: Cosmology (343); Cosmic microwave background radiation (322); Weak gravitational lensing (1797); Large-scale structure of the universe (902); Voids (1779)

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Euclid: Cosmology forecasts from the void-galaxy cross-correlation function with reconstruction

Radinović¹,

Nadathur²,

Winther³

et al. 2023

A&A

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We have investigated the cosmological constraints that can be expected from measurement of the cross-correlation of galaxies with cosmic voids identified in the Euclid spectroscopic survey, which will include spectroscopic information for tens of millions of galaxies over 15 000 deg2 of the sky in the redshift range 0.9 ≤ z < 1.8. We have done this using simulated measurements obtained from the Flagship mock catalogue, the official Euclid mock that closely matches the expected properties of the spectroscopic dataset. To mitigate anisotropic selection-bias effects, we have used a velocity field reconstruction method to remove large-scale redshift-space distortions from the galaxy field before void-finding. This allowed us to accurately model contributions to the observed anisotropy of the cross-correlation function arising from galaxy velocities around voids as well as from the Alcock–Paczynski effect, and we studied the dependence of constraints on the efficiency of reconstruction. We find that Euclid voids will be able to constrain the ratio of the transverse comoving distance DM and Hubble distance DH to a relative precision of about 0.3%, and the growth rate fσ8 to a precision of between 5% and 8% in each of the four redshift bins covering the full redshift range. In the standard cosmological model, this translates to a statistical uncertainty ΔΩm = ±0.0028 on the matter density parameter from voids, which is better than what can be achieved from either Euclid galaxy clustering and weak lensing individually. We also find that voids alone can measure the dark energy equation of state to a 6% precision.

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A Zeldovich reconstruction method for measuring redshift space distortions using cosmic voids

Cited by 34 publications

References 74 publications

Beyond BAO: Improving cosmological constraints from BOSS data with measurement of the void-galaxy cross-correlation

Beyond BAO: Improving cosmological constraints from BOSS data with measurement of the void-galaxy cross-correlation

The Gravitational Lensing Signatures of BOSS Voids in the Cosmic Microwave Background

Euclid: Cosmology forecasts from the void-galaxy cross-correlation function with reconstruction

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