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arXiv · 2312.05184

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·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
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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.

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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. 2023-12-08. LiteBIRD Science Goals and Forecasts: A full-sky measurement of gravitational lensing of the CMB. https://doi.org/10.1088/1475-7516%2F2024%2F06%2F009

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