{"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/new-mgcamb-tests-of-gravity-with-cosmomc-and","title":"New MGCAMB tests of gravity with CosmoMC and Cobaya","arxiv_id":"2305.05667","date":"2023-05-09","proceeding":null,"authors":["Zhuangfei Wang","Seyed Hamidreza Mirpoorian","Levon Pogosian","Alessandra Silvestri","Gong-Bo Zhao"],"abstract":"We present a new version of MGCAMB, a patch for the Einstein-Boltzmann solver CAMB for cosmological tests of gravity. New features include a new cubic-spline parameterization allowing for a simultaneous reconstruction of $\\mu$, $\\Sigma$ and the dark energy density fraction $\\Omega_X$ as functions of redshift, the option to work with a direct implementation of $\\mu$, $\\Sigma$ (instead of converting to $\\mu$, $\\gamma$ first), along with the option to test models with a scalar field coupled only to dark matter, and the option to include dark energy perturbations when working with $w\\ne -1$ backgrounds, to restore consistency with CAMB in the GR limit. This version of MGCAMB comes with a Python wrapper to run it directly from the Python interface, an implementation in the latest version of CosmoMC, and can be used with Cobaya.","url_abs":"https://arxiv.org/abs/2305.05667v2","url_pdf":"https://arxiv.org/pdf/2305.05667v2.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":"new-mgcamb-tests-of-gravity-with-cosmomc-and","repo_url":"https://github.com/sfu-cosmo/MGCAMB","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"new-mgcamb-tests-of-gravity-with-cosmomc-and","repo_url":"https://github.com/sfu-cosmo/MGCosmoMC","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"new-mgcamb-tests-of-gravity-with-cosmomc-and","repo_url":"https://github.com/sfu-cosmo/mgcobaya","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"new-mgcamb-tests-of-gravity-with-cosmomc-and","repo_url":"https://github.com/sfu-cosmo/mgcobaya-beta","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"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}