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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.23823 |
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| _version_ | 1866915936927219712 |
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| author | H0DN Collaboration Casertano, Stefano Anand, Gagandeep Anderson, Richard I. Beaton, Rachael Bhardwaj, Anupam Blakeslee, John P. Boubel, Paula Breuval, Louise Brout, Dillon Cantiello, Michele Reyes, Mauricio Cruz Csörnyei, Geza de Jaeger, Thomas Dhawan, Suhail Di Valentino, Eleonora Galbany, Lluís Gil-Marín, Héctor Graczyk, Dariusz Huang, Caroline Jensen, Joseph B. Kervella, Pierre Leibundgut, Bruno Lengen, Bastian Li, Siyang Macri, Lucas Özülker, Emre Pesce, Dominic W. Riess, Adam Romaniello, Martino Said, Khaled Schöneberg, Nils Scolnic, Dan Sicignano, Teresa Skowron, Dorota M. Uddin, Syed A. Verde, Licia Nota, Antonella |
| author_facet | H0DN Collaboration Casertano, Stefano Anand, Gagandeep Anderson, Richard I. Beaton, Rachael Bhardwaj, Anupam Blakeslee, John P. Boubel, Paula Breuval, Louise Brout, Dillon Cantiello, Michele Reyes, Mauricio Cruz Csörnyei, Geza de Jaeger, Thomas Dhawan, Suhail Di Valentino, Eleonora Galbany, Lluís Gil-Marín, Héctor Graczyk, Dariusz Huang, Caroline Jensen, Joseph B. Kervella, Pierre Leibundgut, Bruno Lengen, Bastian Li, Siyang Macri, Lucas Özülker, Emre Pesce, Dominic W. Riess, Adam Romaniello, Martino Said, Khaled Schöneberg, Nils Scolnic, Dan Sicignano, Teresa Skowron, Dorota M. Uddin, Syed A. Verde, Licia Nota, Antonella |
| contents | The direct, empirical determination of the local value of the Hubble constant (H0) has markedly advanced thanks to improved instrumentation, measurement techniques, and distance estimators. However, combining determinations from different estimators is non-trivial, due to correlated calibrations and different analysis methodologies. Using covariance weighting and leveraging the broad and comprehensive community of experts, we constructed a rigorous and transparent Distance Network (DN) to find a consensus value and uncertainty for the local H0. All critically reviewed the available data sets, spanning parallaxes, detached eclipsing binaries, masers, Cepheids, the TRGB, Miras, JAGB stars, SN Ia, Surface Brightness Fluctuations, SN II, the Fundamental Plane, and Tully-Fisher relations and voted for indicators to define a `baseline' DN and others to assess robustness and sensitivity of the results. We provide open-source software and data products to support full transparency and future extensions of this effort. Our conclusions: 1) Local H0 is robustly determined, with first-rank indicators internally consistent within their uncertainties; 2) A covariance-weighted combination yields an uncertainty of 1.1% (baseline) or 0.9% (all estimators); 3) The contribution from SNe Ia is consistent across four current compilations of optical magnitudes or using NIR-only magnitudes; 4) Removing either Cepheids or TRGB has minimal effect; 5) Replacing SNe Ia with galaxy-based indicators changes H0 by less than 0.1 km/s/Mpc, while doubling its uncertainty; 6) The baseline result is H0=73.50+/-0.81 km/s/Mpc. Compared to early Universe results, our result differs by 7.1sigma from flat ΛCDM with Planck+SPT+ACT and 5.0 sigma with BBN+BAO (DESI2). A networked approach is invaluable for enabling further progress in accuracy and precision without overreliance on any single method, sample or group. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_23823 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Local Distance Network: a community consensus report on the measurement of the Hubble constant at 1% precision H0DN Collaboration Casertano, Stefano Anand, Gagandeep Anderson, Richard I. Beaton, Rachael Bhardwaj, Anupam Blakeslee, John P. Boubel, Paula Breuval, Louise Brout, Dillon Cantiello, Michele Reyes, Mauricio Cruz Csörnyei, Geza de Jaeger, Thomas Dhawan, Suhail Di Valentino, Eleonora Galbany, Lluís Gil-Marín, Héctor Graczyk, Dariusz Huang, Caroline Jensen, Joseph B. Kervella, Pierre Leibundgut, Bruno Lengen, Bastian Li, Siyang Macri, Lucas Özülker, Emre Pesce, Dominic W. Riess, Adam Romaniello, Martino Said, Khaled Schöneberg, Nils Scolnic, Dan Sicignano, Teresa Skowron, Dorota M. Uddin, Syed A. Verde, Licia Nota, Antonella Cosmology and Nongalactic Astrophysics The direct, empirical determination of the local value of the Hubble constant (H0) has markedly advanced thanks to improved instrumentation, measurement techniques, and distance estimators. However, combining determinations from different estimators is non-trivial, due to correlated calibrations and different analysis methodologies. Using covariance weighting and leveraging the broad and comprehensive community of experts, we constructed a rigorous and transparent Distance Network (DN) to find a consensus value and uncertainty for the local H0. All critically reviewed the available data sets, spanning parallaxes, detached eclipsing binaries, masers, Cepheids, the TRGB, Miras, JAGB stars, SN Ia, Surface Brightness Fluctuations, SN II, the Fundamental Plane, and Tully-Fisher relations and voted for indicators to define a `baseline' DN and others to assess robustness and sensitivity of the results. We provide open-source software and data products to support full transparency and future extensions of this effort. Our conclusions: 1) Local H0 is robustly determined, with first-rank indicators internally consistent within their uncertainties; 2) A covariance-weighted combination yields an uncertainty of 1.1% (baseline) or 0.9% (all estimators); 3) The contribution from SNe Ia is consistent across four current compilations of optical magnitudes or using NIR-only magnitudes; 4) Removing either Cepheids or TRGB has minimal effect; 5) Replacing SNe Ia with galaxy-based indicators changes H0 by less than 0.1 km/s/Mpc, while doubling its uncertainty; 6) The baseline result is H0=73.50+/-0.81 km/s/Mpc. Compared to early Universe results, our result differs by 7.1sigma from flat ΛCDM with Planck+SPT+ACT and 5.0 sigma with BBN+BAO (DESI2). A networked approach is invaluable for enabling further progress in accuracy and precision without overreliance on any single method, sample or group. |
| title | The Local Distance Network: a community consensus report on the measurement of the Hubble constant at 1% precision |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2510.23823 |