Exploring cosmic origins with CORE: gravitational lensing of the CMB
Abstract
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]
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@article{arxiv.1707.02259,
title = {Exploring cosmic origins with CORE: gravitational lensing of the CMB},
author = {Anthony Challinor and Rupert Allison and Julien Carron and Josquin Errard and Stephen Feeney and Thomas Kitching and Julien Lesgourgues and Antony Lewis and Íñigo Zubeldía and Ana Achucarro and Peter Ade and Mark Ashdown and Mario Ballardini and A. J. Banday and Ranajoy Banerji and James Bartlett and Nicola Bartolo and Soumen Basak and Daniel Baumann and Marco Bersanelli and Anna Bonaldi and Matteo Bonato and Julian Borrill and François Bouchet and François Boulanger and Thejs Brinckmann and Martin Bucher and Carlo Burigana and Alessandro Buzzelli and Zhen-Yi Cai and Martino Calvo and Carla-Sofia Carvalho and Gabriella Castellano and Jens Chluba and Sebastien Clesse and Ivan Colantoni and Alessandro Coppolecchia and Martin Crook and Giuseppe d'Alessandro and Paolo de Bernardis and Giancarlo de Gasperis and Gianfranco De Zotti and Jacques Delabrouille and Eleonora Di Valentino and Jose-Maria Diego and Raul Fernandez-Cobos and Simone Ferraro and Fabio Finelli and Francesco Forastieri and Silvia Galli and Ricardo Genova-Santos and Martina Gerbino and Joaquin González-Nuevo and Sebastian Grandis and Joshua Greenslade and Steffen Hagstotz and Shaul Hanany and Will Handley and Carlos Hernandez-Monteagudo and Carlos Hervías-Caimapo and Matthew Hills and Eric Hivon and Kimmo Kiiveri and Ted Kisner and Martin Kunz and Hannu Kurki-Suonio and Luca Lamagna and Anthony Lasenby and Massimiliano Lattanzi and Michele Liguori and Valtteri Lindholm and Marcos López-Caniego and Gemma Luzzi and Bruno Maffei and Enrique Martinez-González and C. J. A. P. Martins and Silvia Masi and Darragh McCarthy and Alessandro Melchiorri and Jean-Baptiste Melin and Diego Molinari and Alessandro Monfardini and Paolo Natoli and Mattia Negrello and Alessio Notari and Alessandro Paiella and Daniela Paoletti and Guillaume Patanchon and Michel Piat and Giampaolo Pisano and Linda Polastri and Gianluca Polenta and Agnieszka Pollo and Vivian Poulin and Miguel Quartin and Mathieu Remazeilles and Matthieu Roman and Jose-Alberto Rubino-Martin and Laura Salvati and Andrea Tartari and Maurizio Tomasi and Denis Tramonte and Neil Trappe and Tiziana Trombetti and Carole Tucker and Jussi Valiviita and Rien Van de Weijgaert and Bartjan van Tent and Vincent Vennin and Patricio Vielva and Nicola Vittorio and Karl Young and Mario Zannoni},
journal= {arXiv preprint arXiv:1707.02259},
year = {2019}
}
Comments
44 pages, 12 figures