Expanding Ejecta Method: II. Framework for Cosmological Distance Measurements via Intensity Interferometry
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| Format: | Preprint |
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2025
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| author | Dunsky, David Chen, I-Kai Huang, Junwu Van Tilburg, Ken Wagoner, Robert V. |
| author_facet | Dunsky, David Chen, I-Kai Huang, Junwu Van Tilburg, Ken Wagoner, Robert V. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_08856 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Expanding Ejecta Method: II. Framework for Cosmological Distance Measurements via Intensity Interferometry Dunsky, David Chen, I-Kai Huang, Junwu Van Tilburg, Ken Wagoner, Robert V. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics 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. |
| title | Expanding Ejecta Method: II. Framework for Cosmological Distance Measurements via Intensity Interferometry |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2505.08856 |