LiteBIRD science goals and forecasts: a full-sky measurement of gravitational lensing of the CMB
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Published:2024-06-01
Issue:06
Volume:2024
Page:009
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ISSN:1475-7516
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Container-title:Journal of Cosmology and Astroparticle Physics
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language:
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Short-container-title:J. Cosmol. Astropart. Phys.
Author:
Lonappan A.I.ORCID, Namikawa T., Piccirilli G., Diego-Palazuelos P., Ruiz-Granda M., Migliaccio M., Baccigalupi C., Bartolo N., Beck D., Benabed K., Challinor A., Errard J., Farrens S., Gruppuso A., Krachmalnicoff N., Martínez-González E., Pettorino V., Sherwin B., Starck J., Vielva P., Akizawa R., Anand A., Aumont J., Aurlien R., Azzoni S., Ballardini M., Banday A.J., Barreiro R.B., Bersanelli M., Blinov D., Bortolami M., Brinckmann T., Calabrese E., Campeti P., Carones A., Carralot F., Casas F.J., Cheung K., Clermont L., Columbro F., Conenna G., Coppolecchia A., Cuttaia F., D'Alessandro G., de Bernardis P., De Petris M., Della Torre S., Di Giorgi E., Eriksen H.K., Finelli F., Franceschet C., Fuskeland U., Galloni G., Galloway M., Georges M., Gerbino M., Gervasi M., Génova-Santos R.T., Ghigna T., Giardiello S., Gimeno-Amo C., Gjerløw E., Hazumi M., Henrot-Versillé S., Hergt L.T., Hivon E., Kohri K., Komatsu E., Lamagna L., Lattanzi M., Leloup C., Lembo M., López-Caniego M., Luzzi G., Macias-Perez J., Maffei B., Masi S., Massa M., Matarrese S., Matsumura T., Micheli S., Moggi A., Monelli M., Montier L., Morgante G., Mot B., Mousset L., Nagata R., Natoli P., Novelli A., Obata I., Occhiuzzi A., Pagano L., Paiella A., Paoletti D., Pascual-Cisneros G., Pavlidou V., Piacentini F., Pinchera M., Pisano G., Polenta G., Puglisi G., Remazeilles M., Ritacco A., Rizzieri A., Sakurai Y., Scott D., Shiraishi M., Signorelli G., Stever S.L., Takase Y., Tanimura H., Tartari A., Tassis K., Terenzi L., Tristram M., Vacher L., van Tent B., Wehus I.K., Weymann-Despres G., Zannoni M., Zhou Y.,
Abstract
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 μK-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 80% 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.
Cited by
2 articles.
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