Marius Cautun
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
Authors
Enrique Paillas
Yan-Chuan Cai
Sownak Bose
Joaquin Armijo
Professor Baojiu Li baojiu.li@durham.ac.uk
Professor
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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