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

Cautun, Marius; Paillas, Enrique; Cai, Yan-Chuan; Bose, Sownak; Armijo, Joaquin; Li, Baojiu; Padilla, Nelson

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


Authors

Marius Cautun

Enrique Paillas

Yan-Chuan Cai

Sownak Bose

Joaquin Armijo

Nelson Padilla



Abstract

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.

Citation

Cautun, M., Paillas, E., Cai, Y., Bose, S., Armijo, J., Li, B., & Padilla, N. (2018). The Santiago-Harvard-Edinburgh-Durham void comparison I: SHEDding light on chameleon gravity tests. Monthly Notices of the Royal Astronomical Society, 476(3), 3195-3217. https://doi.org/10.1093/mnras/sty463

Journal Article Type Article
Acceptance Date Feb 5, 2018
Online Publication Date Feb 22, 2018
Publication Date May 1, 2018
Deposit Date Mar 6, 2018
Publicly Available Date Mar 8, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 476
Issue 3
Pages 3195-3217
DOI https://doi.org/10.1093/mnras/sty463

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Copyright 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: https://doi.org/10.1093/mnras/sty463.








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