{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/extending-mgcamb-tests-of-gravity-to","title":"Extending MGCAMB tests of gravity to nonlinear scales","arxiv_id":"2406.09204","date":"2024-06-13","proceeding":null,"authors":["Zhuangfei Wang","Daniela Saadeh","Kazuya Koyama","Levon Pogosian","Benjamin Bose","Lanyang Yi","Gong-Bo Zhao"],"abstract":"Modified Growth with {\\tt CAMB} ({\\tt MGCAMB}) is a patch for the Einstein-Boltzmann solver {\\tt CAMB} for cosmological tests of gravity. Until now, {\\tt MGCAMB} was limited to scales well-described by linear perturbation theory. In this work, we extend the framework with a phenomenological model that can capture nonlinear corrections in a broad range of modified gravity theories. The extension employs the publicly available halo model reaction code {\\tt ReACT}, developed for modeling the nonlinear corrections to cosmological observables in extensions of the $\\Lambda$CDM model. The nonlinear extension makes it possible to use a wider range of data from large scale structure surveys, without applying a linear scale cut. We demonstrate that, with the 3$\\times$2pt Dark Energy Survey data, we achieve a stronger constraint on the linear phenomenological functions $\\mu$ and $\\Sigma$, after marginalzing over the additional nonlinear parameter $p_1$, compared to the case without the nonlinear extension and using a linear cut. The new version of {\\tt MGCAMB} is now forked with {\\tt CAMB} on GitHub allowing for compatibility with future upgrades.","url_abs":"https://arxiv.org/abs/2406.09204v2","url_pdf":"https://arxiv.org/pdf/2406.09204v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"extending-mgcamb-tests-of-gravity-to","repo_url":"https://github.com/sfu-cosmo/MGCAMB","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"framework":"none","reach":null},{"paper_slug":"extending-mgcamb-tests-of-gravity-to","repo_url":"https://github.com/sfu-cosmo/mgcobaya","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}