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The Santiago-Harvard-Edinburgh-Durham void comparison II : unveiling the Vainshtein screening using weak lensing.

Paillas, Enrique and Cautun, Marius and Li, Baojiu and Cai, Yan-Chuan and Padilla, Nelson and Armijo, Joaquin and Bose, Sownak (2019) 'The Santiago-Harvard-Edinburgh-Durham void comparison II : unveiling the Vainshtein screening using weak lensing.', Monthly notices of the Royal Astronomical Society. .

Abstract

We study cosmic voids in the normal-branch Dvali-Gabadadze-Porrati (nDGP) braneworld models, which are representative of a class of modified gravity theories where deviations from General Relativity are usually hidden by the Vainshtein screening in high-density environments. This screening is less efficient away from these environments, which makes voids ideally suited for testing this class of models. We use N-body simulations of Λ-cold dark matter (ΛCDM) and nGDP universes, where dark matter haloes are populated with mock galaxies that mimic the clustering and number densities of the BOSS CMASS galaxy sample. We measure the force, density and weak lensing profiles around voids identified with six different algorithms. Compared to ΛCDM, voids in nDGP are more under-dense due to the action of the fifth force that arises in these models, which leads to a faster evacuation of matter from voids. This leaves an imprint on the weak lensing tangential shear profile around nDGP voids, an effect that is particularly strong for 2D underdensities that are identified in the plane-of-the-sky. We make predictions for the feasibility of distinguishing between nDGP and ΛCDM using void lensing in upcoming large-scale surveys such as LSST and EUCLID. We compare with the analysis of voids in chameleon gravity theories and find that the weak lensing signal for 3D voids is similar to nDGP, whereas for 2D voids the differences with ΛCDM are much stronger for the chameleon gravity case, a direct consequence of the different screening mechanisms operating in these theories.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/stz022
Publisher statement:This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record will be available online at: https://doi.org/10.1093/mnras/stz022
Date accepted:25 December 2018
Date deposited:08 January 2019
Date of first online publication:05 January 2019
Date first made open access:08 January 2019

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