{"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/expanding-ejecta-method-ii-framework-for","title":"Expanding Ejecta Method: II. Framework for Cosmological Distance Measurements via Intensity Interferometry","arxiv_id":"2505.08856","date":"2025-05-13","proceeding":null,"authors":["David Dunsky","I-Kai Chen","Junwu Huang","Ken Van Tilburg","Robert V. Wagoner"],"abstract":"We explore the potential of the expanding ejecta method (EEM) as a cosmological probe, leveraging its ability to measure angular diameter distances to supernovae (SNe) with intensity interferometry. We propose three distinct applications of the EEM: (1) using Type IIP SNe as moderate-distance geometric anchors to calibrate Cepheids, replacing other local distance indicators; (2) directly calibrating Type Ia SNe, bypassing conventional calibration methods; (3) constructing a fully independent Hubble diagram with Type IIP (Type Ia) SNe, entirely decoupled from the traditional distance ladder. Incorporating realistic SN populations, we forecast a Hubble constant precision with next-generation intensity interferometers of $1.6\\%$, $1.1\\%$, and $9.3\\% \\,(3.6\\%)$, respectively, for the three different proposed applications. Future intensity interferometry could yield improvements to $1.2\\%$, $0.6\\%$, and $1.5\\%\\,(0.4\\%)$. The EEM thus offers a powerful geometric alternative for cosmic distance determination.","url_abs":"https://arxiv.org/abs/2505.08856v1","url_pdf":"https://arxiv.org/pdf/2505.08856v1.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":"expanding-ejecta-method-ii-framework-for","repo_url":"https://github.com/calvinikchen/expanding-ejecta","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"jax","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}