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Using cosmic voids to distinguish f(R) gravity in future galaxy surveys.

Zivick, P. and Sutter, P. M. and Wandelt, B. D. and Li, B. and Lam, T. Y. (2015) 'Using cosmic voids to distinguish f(R) gravity in future galaxy surveys.', Monthly notices of the Royal Astronomical Society., 451 (4). pp. 4215-4222.

Abstract

We use properties of void populations identified in N-body simulations to forecast the ability of upcoming galaxy surveys to differentiate models of f (R) gravity from cold dark matter cosmology. We analyse multiple simulation realizations, which were designed to mimic the expected number densities, volumes, and redshifts of the upcoming Euclid satellite and a lower-redshift ground-based counterpart survey, using the public VIDE toolkit. We examine void abundances, ellipicities, radial density profiles, and radial velocity profiles at redshifts 1.0 and 0.43. We find that stronger f (R) coupling strengths eliminates small voids and produces voids up to ∼20 per cent larger in radius, leading to a significant tilt in the void number function. Additionally, under the influence of modified gravity, voids at all scales tend to be measurably emptier with correspondingly higher compensation walls. The velocity profiles reflect this, showing increased outflows inside voids and increased inflows outside voids. Using the void number function as an example, we forecast that future surveys can constrain the modified gravity coupling strength to ∼3 × 10−5 using voids.

Item Type:Article
Keywords:Large-scale structure of Universe.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/mnras/stv1209
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:28 May 2015
Date deposited:16 February 2016
Date of first online publication:August 2015
Date first made open access:No date available

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