{"paper":{"title":"BICEP/Keck XVIII: Measurement of BICEP3 polarization angles and consequences for constraining cosmic birefringence and inflation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":":, A. C. Weber, A. D. Turner, A. Fortes, A. Greathouse, A. G. Vieregg, A. J. Cukierman, A. Lennox, A. Patel, A. R. Polish, A. Schillaci, A. Soliman, A. Steiger, A. Wandui, B. D. Elwood, BICEP/Keck Collaboration, B. Schmitt, B. Singari, B. Steinbach, C. A. Bischoff, C. D. Reintsema, C. Giannakopoulos, C. Kuo, C. Pryke, C. Tsai, C. Tucker, C. Verg\\`es, C. Yu, C. Zhang, D. Barkats, D. Beck, D. C. Goldfinger, E. Denison, E. Hand, G. Halal, G. Hall, H. Boenish, H. Hui, H. T. Nguyen, H. Yang, J. A. Grayson, J. Connors, J. Cornelison, J. H. Kang, J. Hubmayr, J. J. Bock, J. M. Kovac, J. P. Filippini, J. R. Cheshire IV, J. Willmert, K. D. Irwin, K. G. Megerian, K. Lau, K. L. Thompson, K. Sjoberg, K. S. Karkare, L. Duband, L. Minutolo, L. Moncelsi, L. Zeng, M. Amiri, M. A. Petroff, M. Crumrine, M. Eiben, M. Gao, M. Halpern, M. Lautzenhiser, M. Salatino, N. Goeckner-Wald, P. A. R. Ade, P. K. Grimes, R. Basu Thakur, R. O'Brient, R. Sudiwala, S. A. Harrison, S. Fatigoni, S. Henderson, S. Kefeli, S. Zhang, T. Liu, T. Prouve, T. Romand, T. St Germaine, V. Buza, W. L. K. Wu, Y. Nakato, Z. Ahmed","submitted_at":"2024-10-15T22:15:23Z","abstract_excerpt":"We use a custom-made calibrator to measure individual detectors' polarization angles of BICEP3, a small aperture telescope observing the cosmic microwave background (CMB) at 95GHz from the South Pole. We describe our calibration strategy and the statistical and systematic uncertainties associated with the measurement. We reach an unprecedented precision for such measurement on a CMB experiment, with a repeatability for each detector pair of $0.02\\deg$. We show that the relative angles measured using this method are in excellent agreement with those extracted from CMB data. Because the absolute"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2410.12089","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2410.12089/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}