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SELCIE: a tool for investigating the chameleon field of arbitrary sources

Briddon, Chad; Burrage, Clare; Moss, Adam; Tamosiunas, Andrius

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Authors

Chad Briddon

Andrius Tamosiunas



Abstract

The chameleon model is a modified gravity theory that introduces an additional scalar field that couples to matter through a conformal coupling. This `chameleon field' possesses a screening mechanism through a nonlinear self-interaction term which allows the field to affect cosmological observables in diffuse environments whilst still being consistent with current local experimental constraints. Due to the self-interaction term the equations of motion of the field are nonlinear and therefore difficult to solve analytically. The analytic solutions that do exist in the literature are either approximate solutions and or only apply to highly symmetric systems. In this work we introduce the software package SELCIE (https://github.com/C-Briddon/SELCIE.git). This package equips the user with tools to construct an arbitrary system of mass distributions and then to calculate the corresponding solution to the chameleon field equation. It accomplishes this by using the finite element method and either the Picard or Newton nonlinear solving methods. We compared the results produced by SELCIE with analytic results from the literature including discrete and continuous density distributions. We found strong (sub-percentage) agreement between the solutions calculated by SELCIE and the analytic solutions.

Citation

Briddon, C., Burrage, C., Moss, A., & Tamosiunas, A. (2021). SELCIE: a tool for investigating the chameleon field of arbitrary sources. Journal of Cosmology and Astroparticle Physics, 2021(12), 1-24. https://doi.org/10.1088/1475-7516/2021/12/043

Journal Article Type Article
Acceptance Date Nov 26, 2021
Online Publication Date Dec 21, 2021
Publication Date 2021-12
Deposit Date Jan 4, 2022
Publicly Available Date Jan 4, 2022
Journal Journal of Cosmology and Astroparticle Physics
Electronic ISSN 1475-7516
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2021
Issue 12
Article Number 043
Pages 1-24
DOI https://doi.org/10.1088/1475-7516/2021/12/043
Keywords modified gravity, dark energy theory, dark energy experiments
Public URL https://nottingham-repository.worktribe.com/output/7162828
Publisher URL https://iopscience.iop.org/article/10.1088/1475-7516/2021/12/043
Additional Information Article Title: SELCIE: a tool for investigating the chameleon field of arbitrary sources; Journal Title: Journal of Cosmology and Astroparticle Physics; Article Type: paper; Copyright Information: © 2021 The Author(s); Date Received: 2021-11-11; Date Accepted: 2021-11-26; Online publication date: 2021-12-21

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