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The chameleon model is a modified gravity theory that introduces anadditional scalar field that couples to matter through a conformal coupling.This `chameleon field' possesses a screening mechanism through a nonlinearself-interaction term which allows the field to affect cosmological observablesin diffuse environments whilst still being consistent with current localexperimental constraints. Due to the self-interaction term the equations ofmotion of the field are nonlinear and therefore difficult to solveanalytically. The analytic solutions that do exist in the literature are eitherapproximate solutions and or only apply to highly symmetric systems. In thiswork we introduce the software package SELCIE(https://github.com/C-Briddon/SELCIE.git). This package equips the user withtools to construct an arbitrary system of mass distributions and then tocalculate the corresponding solution to the chameleon field equation. Itaccomplishes this by using the finite element method and either the Picard orNewton nonlinear solving methods. We compared the results produced by SELCIEwith analytic results from the literature including discrete and continuousdensity distributions. We found strong (sub-percentage) agreement between thesolutions calculated by SELCIE and the analytic solutions.

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