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The Santiago-Harvard-Edinburgh-Durham void comparison I : SHEDding light on chameleon gravity tests.

Cautun, Marius and Paillas, Enrique and Cai, Yan-Chuan and Bose, Sownak and Armijo, Joaquin and Li, Baojiu and Padilla, Nelson (2018) 'The Santiago-Harvard-Edinburgh-Durham void comparison I : SHEDding light on chameleon gravity tests.', Monthly notices of the Royal Astronomical Society., 476 (3). pp. 3195-3217.


We present a systematic comparison of several existing and new void finding algorithms, focusing on their potential power to test a particular class of modified gravity models – chameleon f(R) gravity. These models deviate from standard General Relativity (GR) more strongly in low-density regions and thus voids are a promising venue to test them. We use Halo Occupation Distribution (HOD) prescriptions to populate haloes with galaxies, and tune the HOD parameters such that the galaxy two-point correlation functions are the same in both f(R) and GR models. We identify both 3D voids as well as 2D underdensities in the plane-of-the-sky to find the same void abundance and void galaxy number density profiles across all models, which suggests that they do not contain much information beyond galaxy clustering. However, the underlying void dark matter density profiles are significantly different, with f(R) voids being more underdense than GR ones, which leads to f(R) voids having a larger tangential shear signal than their GR analogues. We investigate the potential of each void finder to test f(R) models with near-future lensing surveys such as EUCLID and LSST. The 2D voids have the largest power to probe f(R) gravity, with a LSST analysis of tunnel (which is a new type of 2D underdensity introduced here) lensing distinguishing at 80 and 11σ (statistical error) f(R) models with parameters, |fR0| = 10−5 and 10−6, from GR.

Item Type:Article
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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 Marius Cautun, Enrique Paillas, Yan-Chuan Cai, Sownak Bose, Joaquin Armijo, Baojiu Li, Nelson Padilla; The Santiago-Harvard-Edinburgh-Durham void comparison I: SHEDding light on chameleon gravity tests, Monthly Notices of the Royal Astronomical Society, sty463 is available online at:
Date accepted:05 February 2018
Date deposited:08 March 2018
Date of first online publication:22 February 2018
Date first made open access:No date available

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