{"paper":{"title":"DESI DR2 Results IV: Alcock-Paczy\\'nski Measurements from the Lyman Alpha Forest and Cosmological Constraints","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Anand, A. Aviles, A. Bault, A. Brodzeller, A. Carnero Rosell, A. Cuceu, A. de la Macorra, A. Dey, A. D. Myers, A. Font-Ribera, A. J. Ross, A. Kremin, A. Krolewski, A. Leauthaud, A. Meisner, A. Mu\\~noz-Guti\\'errez, A. P\\'erez-Fern\\'andez, A. Porredon, A. Raichoor, A. Robertson, A. Rocher, A. Shafieloo, A. X. Gonzalez-Morales, B. A. Weaver, B. Hadzhiyska, C. Blake, C. Garcia-Quintero, C. Gordon, C. Hahn, C. Lamman, C. Ravoux, C. Saulder, C. S. Frenk, C. Y\\`eche, D. Bianchi, D. Brooks, D. Chebat, DESI Collaboration: A. G. Adame, D. Forero-S\\'anchez, D. Green, D. Huterer, D. J. Eisenstein, D. Kirkby, D. Schlegel, E. Armengaud, E. Chaussidon, E. Fern\\'andez-Garc\\'ia, E. Mueller, E. Paillas, E. Sanchez, F. Beutler, F. J. Castander, F. Prada, F. Sinigaglia, G. Farren, G. Gambardella, G. Gutierrez, G. Niz, G. Rossi, G. Tarl\\'e, H. Ebina, H. E. Noriega, H. Gil-Mar\\'in, H. K. Herrera-Alcantar, H. Pulido-Hern\\'andez, H. Seo, H. Yang, H. Zhang, I. P\\'erez-R\\`afols, J. Aguilar, J. Chaves-Montero, J. Della Costa, J. E. Forero-Romero, J. Guy, J. Hou, J. Lasker, J.M. Le Goff, J. Morawetz, J. Moustakas, J. Najita, J. Pan, J.-Q. Jiang, J. Ratajczak, J. R. Bermejo-Climent, J. Rohlf, J. Silber, J. Yu, K. Carrion, K. Honscheid, K. Lodha, K. S. Dawson, L. Casas, L. H. Garrison, L. Le Guillou, L. Samushia, M. Bonici, M. Doshi, M.-F. Ho, M. F. Ruiz-Herrera Bernal, M. Herbold, M. Ishak, M. Landriau, M. Manera, M. Maus, M. P. Ibanez, M. Rashkovetskyi, M. Siudek, M. Vargas-Maga\\~na, M. Wolfson, N. G. Kara\\c{c}ayl{\\i}, N. Palanque-Delabrouille, N. V. Kamble, O. Alves, O. Lahav, O. Manasoiu, P. Bansal, P. Martini, P. Mukherjee, Q. Li, R. de Belsunce, R. Gsponer, R. Miquel, R. Ruggeri, R. Sharples, R. Vaisakh, R. Zhao, R. Zhou, S. Ahlen, S. Avila, S. Blasby, S. Brieden, S. Ferraro, S. Gontcho A Gontcho, S. He, S. Jos, S. Juneau, S. Nadathur, T. Claybaugh, T. Karim, T. M. Davis, T. Tan, U. Andrade, V. A. Fawcett, V. Ir\\v{s}i\\v{c}, W. Elbers, W. J. Percival, W. Liu, W. Turner, X. Chen, Y. Cho, Y. Luo, Y. Zhang, Z. Chen","submitted_at":"2026-07-29T19:29:27Z","abstract_excerpt":"We present Alcock-Paczy\\'nski (AP) measurements from the full shape of Lyman-$\\alpha$ (Ly$\\alpha$) forest correlation functions measured from the second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI). Our measurements include information from the Ly$\\alpha$ forest auto-correlation and its cross-correlation with quasars. We constrain the AP effect with $1\\%$ precision at an effective redshift $z_\\mathrm{eff}=2.33$, which is twice as tight as the Baryon Acoustic Oscillation (BAO) constraint from the same data. When using the joint Ly$\\alpha$ AP and BAO results, we measure "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.27410","kind":"arxiv","version":1},"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/2607.27410/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"}