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arxiv: 2312.05184 · v1 · pith:BPKCQFWAnew · submitted 2023-12-08 · 🌌 astro-ph.CO

LiteBIRD Science Goals and Forecasts: A full-sky measurement of gravitational lensing of the CMB

A. I. Lonappan , T. Namikawa , G. Piccirilli , P. Diego-Palazuelos , M. Ruiz-Granda , M. Migliaccio , C. Baccigalupi , N. Bartolo
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D. Beck K. Benabed A. Challinor J. Errard S. Farrens A. Gruppuso N. Krachmalnicoff E. Mart\'inez-Gonz\'alez 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. G\'enova-Santos T. Ghigna S. Giardiello C. Gimeno-Amo E. Gjerl{\o}w M. Hazumi S. Henrot-Versill\'e L. T. Hergt E. Hivon K. Kohri E. Komatsu L. Lamagna M. Lattanzi C. Leloup M. Lembo M. L\'opez-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 (for the LiteBIRD Collaboration)
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keywords lensingpolarizationfull-skylitebirdmeasurementplanckcapabilitydata
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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.

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