{"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/investigating-the-hubble-tension-and-s-8","title":"Investigating the Hubble Tension and $σ_8$ Discrepancy in f(Q) Cosmology","arxiv_id":"2405.03627","date":"2024-05-06","proceeding":null,"authors":["Ziad Sakr","Leonid Schey"],"abstract":"In this study, we incorporated a three-parameter family, of the metric incompatible modification of standard general relativity $f(Q)$ models into the Boltzmann code MGCLASS at both the background and perturbation levels, in order to conduct a Bayesian study employing probes that include the cosmic microwave background (CMB), baryon acoustic oscillations (BAO), weak lensing (WL), alone or its correlation with galaxy clustering (3$\\times$2pt) and growth measurements $f \\sigma_8$, for each submodel. Our analysis focused on the impact of the Hubble tension in $H_0$ and the discrepancy in $\\sigma_8$ resulting from the inclusion of our model parameters, namely $M$, $\\alpha$ and $\\beta$. We find that none of the sub models, considered alone or combined, were able of alleviating the Hubble tension with only reducing it to 3 $\\sigma$ in the least constraining, highest degree of freedom case while we found that the $\\sigma_8$ discrepancy, already strongly mitigated on WL linear scales, especially when we let all our model's parameters as free, appears again when considering the more constraining 3$\\times$2pt probe. Among the parameters considered, we found that $\\beta$, acting in scaling both the gravitational and the Hubble parameter, had the most impact in reducing the discrepancy, with data preferring far from $\\Lambda$CDM alike values, before the combination with $f \\sigma_8$ constrain it back to its general relativity values.","url_abs":"https://arxiv.org/abs/2405.03627v1","url_pdf":"https://arxiv.org/pdf/2405.03627v1.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":"investigating-the-hubble-tension-and-s-8","repo_url":"https://gitlab.com/zizgitlab/mgclass--ii","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}