LiteBIRD science goals and forecasts: a full-sky measurement of gravitational lensing of the CMB

Lonappan, A. I.; 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. et al.
Bibliographical reference

Journal of Cosmology and Astroparticle Physics

Advertised on:
6
2024
Number of authors
123
IAC number of authors
1
Citations
8
Refereed citations
3
Description
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.
Related projects
Full-sky map showing the spatial distribution of the primary anisotropies of the Cosmic Microwave Background (generated 380,000 years after the Big Bang) derived from observations of the Planck satellite
Anisotropy of the Cosmic Microwave Background
The general goal of this project is to determine and characterize the spatial and spectral variations in the temperature and polarisation of the Cosmic Microwave Background in angular scales from several arcminutes to several degrees. The primordial matter density fluctuations which originated the structure in the matter distribution of the present
Rafael
Rebolo López