{"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/litebird-science-goals-and-forecasts-a-full","title":"LiteBIRD Science Goals and Forecasts: A full-sky measurement of gravitational lensing of the CMB","arxiv_id":"2312.05184","date":"2023-12-08","proceeding":null,"authors":["A. I. Lonappan","T. Namikawa","G. Piccirilli","P. Diego-Palazuelos","M. Ruiz-Granda","M. Migliaccio","C. Baccigalupi","N. Bartolo","D. Beck","K. Benabed","A. Challinor","J. Errard","S. Farrens","A. Gruppuso","N. Krachmalnicoff","E. Martínez-González","V. Pettorino","B. Sherwin","J. Starck","P. Vielva","R. Akizawa","A. Anand","J. Aumont","R. Aurlien","S. Azzoni","M. Ballardini","A. J. Banday","R. B. Barreiro","M. Bersanelli","D. Blinov","M. Bortolami","T. Brinckmann","E. Calabrese","P. Campeti","A. Carones","F. Carralot","F. J. Casas","K. Cheung","L. Clermont","F. Columbro","G. Conenna","A. Coppolecchia","F. Cuttaia","G. D'Alessandro","P. de Bernardis","M. De Petris","S. Della Torre","E. Di Giorgi","H. K. Eriksen","F. Finelli","C. Franceschet","U. Fuskeland","G. Galloni","M. Galloway","M. Georges","M. Gerbino","M. Gervasi","R. T. Génova-Santos","T. Ghigna","S. Giardiello","C. Gimeno-Amo","E. Gjerløw","M. Hazumi","S. Henrot-Versillé","L. T. Hergt","E. Hivon","K. Kohri","E. Komatsu","L. Lamagna","M. Lattanzi","C. Leloup","M. Lembo","M. López-Caniego","G. Luzzi","J. Macias-Perez","B. Maffei","S. Masi","M. Massa","S. Matarrese","T. Matsumura","S. Micheli","A. Moggi","M. Monelli","L. Montier","G. Morgante","B. Mot","L. Mousset","R. Nagata","P. Natoli","A. Novelli","I. Obata","A. Occhiuzzi","L. Pagano","A. Paiella","D. Paoletti","G. Pascual-Cisneros","V. Pavlidou","F. Piacentini","M. Pinchera","G. Pisano","G. Polenta","G. Puglisi","M. Remazeilles","A. Ritacco","A. Rizzieri","Y. Sakurai","D. Scott","M. Shiraishi","G. Signorelli","S. L. Stever","Y. Takase","H. Tanimura","A. Tartari","K. Tassis","L. Terenzi","M. Tristram","L. Vacher","B. van Tent","I. K. Wehus","G. Weymann-Despres","M. Zannoni","Y. Zhou"],"abstract":"We explore the capability of measuring lensing signals in $LiteBIRD$ full-sky polarization maps. With a $30$ arcmin beam width and an impressively low polarization noise of $2.16\\,\\mu$K-arcmin, $LiteBIRD$ will be able to measure the full-sky polarization of the cosmic microwave background (CMB) very precisely. This unique sensitivity also enables the reconstruction of a nearly full-sky lensing map using only polarization data, even considering its limited capability to capture small-scale CMB anisotropies. In this paper, we investigate the ability to construct a full-sky lensing measurement in the presence of Galactic foregrounds, finding that several possible biases from Galactic foregrounds should be negligible after component separation by harmonic-space internal linear combination. We find that the signal-to-noise ratio of the lensing is approximately $40$ using only polarization data measured over $90\\%$ of the sky. This achievement is comparable to $Planck$'s recent lensing measurement with both temperature and polarization and represents a four-fold improvement over $Planck$'s polarization-only lensing measurement. The $LiteBIRD$ lensing map will complement the $Planck$ lensing map and provide several opportunities for cross-correlation science, especially in the northern hemisphere.","url_abs":"https://arxiv.org/abs/2312.05184v1","url_pdf":"https://arxiv.org/pdf/2312.05184v1.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":"litebird-science-goals-and-forecasts-a-full","repo_url":"https://github.com/antolonappan/dell","is_official":1,"mentioned_in_paper":0,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}