{"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/primordial-bounce-inflation-scenario-to","title":"Primordial Bounce-Inflation Scenario to Alleviate Cosmological Tensions and Lensing Anomaly","arxiv_id":"2409.04027","date":"2024-09-06","proceeding":null,"authors":["Hao-Hao Li","Xin-zhe Zhang","Taotao Qiu"],"abstract":"We put forward a primordial scenario to alleviate cosmological tensions, i.e. Hubble ($H_0$) tension and $ S_8 $ tension. Based on flat $\\Lambda$CDM, the Bounce-Inflation (BI) scenario gives the results that $ H_0 = 68.60^{+0.40}_{-0.45} \\, \\text{km}/\\text{s}/\\text{Mpc}$, $ S_8 = 0.806 \\pm 0.011 $ by using \\texttt{Planck 2018} data sets and $ H_0 = 68.96 \\pm 0.38 \\, \\text{km}/\\text{s}/\\text{Mpc}$, $ S_8 = 0.797\\pm 0.010 $ by using \\texttt{Planck 2018} + \\texttt{SPT3G} data sets. These reduce the cosmological tensions slightly. We also take an extended $\\Lambda$CDM model into account, $\\Lambda$CDM (BI)+$A_L$, where $ A_L $ is the gravitational lensing amplitude. The results are $ H_0 = 69.38 \\pm 0.49 \\, \\text{km}/\\text{s}/\\text{Mpc}$, $ S_8 = 0.774 \\pm 0.014 $ fitted by \\texttt{Planck 2018} data sets and $ H_0 = 69.49 \\pm 0.45 \\, \\text{km}/\\text{s}/\\text{Mpc}$, $ S_8 = 0.771^{+0.013}_{-0.012} $ fitted by \\texttt{Planck 2018} + \\texttt{SPT3G} data sets, which reduce the Hubble tension to $\\sim 3\\sigma $ level and show no $S_8 $ tension. The $A_L \\approx 1.1$ is smaller than the result of the inflation scenario with a constraint of \\texttt{Planck 2018} data sets. Besides, the spectral index of the bounce-inflation scenario $ n_s $ is about $ 0.98 $, with a trend to the Harrison-Zel'dovich spectrum.","url_abs":"https://arxiv.org/abs/2409.04027v2","url_pdf":"https://arxiv.org/pdf/2409.04027v2.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":"primordial-bounce-inflation-scenario-to","repo_url":"https://github.com/Haohaolic/bounce_inflation","is_official":1,"mentioned_in_paper":0,"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}