{"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/fast-rigorous-constraints-on-chiral-three","title":"Rigorous constraints on three-nucleon forces in chiral effective field theory from fast and accurate calculations of few-body observables","arxiv_id":"2104.04441","date":"2021-04-09","proceeding":null,"authors":["S. Wesolowski","I. Svensson","A. Ekström","C. Forssén","R. J. Furnstahl","J. A. Melendez","D. R. Phillips"],"abstract":"We explore the constraints on the three-nucleon force (3NF) of chiral effective field theory ($\\chi$EFT) that are provided by bound-state observables in the $A=3$ and $A=4$ sectors. Our statistically rigorous analysis incorporates experimental error, computational method uncertainty, and the uncertainty due to truncation of the $\\chi$EFT expansion at next-to-next-to-leading order. A consistent solution for the ${}^3$H binding energy, the ${}^4$He binding energy and radius, and the ${}^3$H $\\beta$-decay rate can only be obtained if $\\chi$EFT truncation errors are included in the analysis. All of these except the $\\beta$-decay rate give essentially degenerate constraints on the 3NF low-energy constants, so it is crucial for estimating these parameters. We use eigenvector continuation for fast and accurate emulation of No-Core Shell Model calculations of the considered few-nucleon observables. This facilitates sampling of the posterior probability distribution, allowing us to also determine the distributions of the hyperparameters that quantify the truncation error. We find a $\\chi$EFT expansion parameter of $Q=0.33 \\pm 0.06$ for these observables.","url_abs":"https://arxiv.org/abs/2104.04441v2","url_pdf":"https://arxiv.org/pdf/2104.04441v2.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":"fast-rigorous-constraints-on-chiral-three","repo_url":"https://github.com/buqeye/fast-few-body-bayesing","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}