Exploring cosmic origins with CORE: gravitational lensing of the CMB
Creators: name: Challinor, Anthony
name: Allison, Rupert
name: Carron, Julien
name: Errard, Josquin
name: Feeney, Stephen
name: Kitching, Thomas
name: Lesgourgues, Julien
name: Lewis, Antony
name: Zubeldía, Íñigo
name: Achucarro, Ana
name: Ade, Peter
name: Ashdown, Mark
name: Ballardini, Mario
name: Banday, A. J.
name: Banerji, Ranajoy
name: Bartlett, James
name: Bartolo, Nicola
name: Basak, Soumen
name: Baumann, Daniel
name: Bersanelli, Marco
name: Bonaldi, Anna
name: Bonato, Matteo
name: Borrill, Julian
name: Bouchet, François
name: Boulanger, François
name: Brinckmann, Thejs
name: Bucher, Martin
name: Burigana, Carlo
name: Buzzelli, Alessandro
name: Cai, Zhen-Yi
name: Calvo, Martino
name: Carvalho, Carla-Sofia
name: Castellano, Gabriella
name: Chluba, Jens
name: Clesse, Sebastien
name: Colantoni, Ivan
name: Coppolecchia, Alessandro
name: Crook, Martin
name: d'Alessandro, Giuseppe
name: de Bernardis, Paolo
name: de Gasperis, Giancarlo
name: De Zotti, Gianfranco
name: Delabrouille, Jacques
name: Di Valentino, Eleonora
name: Diego, Jose-Maria
name: Fernandez-Cobos, Raul
name: Ferraro, Simone
name: Finelli, Fabio
name: Forastieri, Francesco
name: Galli, Silvia
name: Genova-Santos, Ricardo
name: Gerbino, Martina
name: González-Nuevo, Joaquin
name: Grandis, Sebastian
name: Greenslade, Joshua
name: Hagstotz, Steffen
name: Hanany, Shaul
name: Handley, Will
name: Hernandez-Monteagudo, Carlos
name: Hervías-Caimapo, Carlos
name: Hills, Matthew
name: Hivon, Eric
name: Kiiveri, Kimmo
name: Kisner, Ted
name: Kunz, Martin
name: Kurki-Suonio, Hannu
name: Lamagna, Luca
name: Lasenby, Anthony
name: Lattanzi, Massimiliano
name: Liguori, Michele
name: Lindholm, Valtteri
name: López-Caniego, Marcos
name: Luzzi, Gemma
name: Maffei, Bruno
name: Martinez-González, Enrique
name: Martins, C. J. A. P.
name: Masi, Silvia
name: McCarthy, Darragh
name: Melchiorri, Alessandro
name: Melin, Jean-Baptiste
name: Molinari, Diego
name: Monfardini, Alessandro
name: Natoli, Paolo
name: Negrello, Mattia
name: Notari, Alessio
name: Paiella, Alessandro
name: Paoletti, Daniela
name: Patanchon, Guillaume
name: Piat, Michel
name: Pisano, Giampaolo
name: Polastri, Linda
name: Polenta, Gianluca
name: Pollo, Agnieszka
name: Poulin, Vivian
name: Quartin, Miguel
name: Remazeilles, Mathieu
name: Roman, Matthieu
name: Rubino-Martin, Jose-Alberto
name: Salvati, Laura
name: Tartari, Andrea
name: Tomasi, Maurizio
name: Tramonte, Denis
name: Trappe, Neil
name: Trombetti, Tiziana
name: Tucker, Carole
name: Valiviita, Jussi
name: Van de Weijgaert, Rien
name: van Tent, Bartjan
name: Vennin, Vincent
name: Vielva, Patricio
name: Vittorio, Nicola
name: Young, Karl
name: Zannoni, Mario
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Lensing of the CMB is now a well-developed probe of large-scale clustering over a broad range of redshifts. By exploiting the non-Gaussian imprints of lensing in the polarization of the CMB, the CORE mission can produce a clean map of the lensing deflections over nearly the full-sky. The number of high-S/N modes in this map will exceed current CMB lensing maps by a factor of 40, and the measurement will be sample-variance limited on all scales where linear theory is valid. Here, we summarise this mission product and discuss the science that it will enable. For example, the summed mass of neutrinos will be determined to an accuracy of 17 meV combining CORE lensing and CMB two-point information with contemporaneous BAO measurements, three times smaller than the minimum total mass allowed by neutrino oscillations. In the search for B-mode polarization from primordial gravitational waves with CORE, lens-induced B-modes will dominate over instrument noise, limiting constraints on the gravitational wave power spectrum amplitude. With lensing reconstructed by CORE, one can "delens" the observed polarization internally, reducing the lensing B-mode power by 60%. This improves to 70% by combining lensing and CIB measurements from CORE, reducing the error on the gravitational wave amplitude by 2.5 compared to no delensing (in the null hypothesis). Lensing measurements from CORE will allow calibration of the halo masses of the 40000 galaxy clusters that it will find, with constraints dominated by the clean polarization-based estimators. CORE can accurately remove Galactic emission from CMB maps with its 19 frequency channels. We present initial findings that show that residual Galactic foreground contamination will not be a significant source of bias for lensing power spectrum measurements with CORE. [abridged]
description: 44 pages, 12 figures