TY - JOUR
T1 - Exploring cosmic origins with CORE
T2 - gravitational lensing of the CMB
AU - CORE
AU - Challinor, Anthony
AU - Allison, Rupert
AU - Carron, Julien
AU - Errard, Josquin
AU - Feeney, Stephen
AU - Kitching, Thomas
AU - Lesgourgues, Julien
AU - Lewis, Antony
AU - Zubeldía, Íñigo
AU - Achucarro, Ana
AU - Ade, Peter
AU - Ashdown, Mark
AU - Ballardini, Mario
AU - Banday, A. J.
AU - Banerji, Ranajoy
AU - Bartlett, James
AU - Bartolo, Nicola
AU - Basak, Soumen
AU - Baumann, Daniel
AU - Bersanelli, Marco
AU - Bonaldi, Anna
AU - Bonato, Matteo
AU - Borrill, Julian
AU - Bouchet, François
AU - Boulanger, François
AU - Brinckmann, Thejs
AU - Bucher, Martin
AU - Burigana, Carlo
AU - Buzzelli, Alessandro
AU - Cai, Zhen-Yi
AU - Calvo, Martino
AU - Carvalho, Carla-Sofia
AU - Castellano, Gabriella
AU - Chluba, Jens
AU - Clesse, Sebastien
AU - Colantoni, Ivan
AU - Coppolecchia, Alessandro
AU - Crook, Martin
AU - d'Alessandro, Giuseppe
AU - Bernardis, Paolo de
AU - Gasperis, Giancarlo de
AU - Zotti, Gianfranco De
AU - Delabrouille, Jacques
AU - Valentino, Eleonora Di
AU - Diego, Jose-Maria
AU - Fernandez-Cobos, Raul
AU - Ferraro, Simone
AU - Finelli, Fabio
AU - Forastieri, Francesco
AU - Galli, Silvia
N1 - Funding Information:
AC and RA acknowledge support from the U.K. Science and Technology Facilities Council (grant number ST/N000927/1) as does AL (grant number ST/L000652/1). AL and JC acknowledge support from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013) / ERC Grant Agreement No. [616170]. J.G.N. acknowledges financial support from the Spanish MINECO for a ‘Ramon y Cajal’ Fellowship (RYC-2013-13256) and the I+D 2015 project AYA2015-65887-P (MINECO/FEDER).” CJM is supported by an FCT Research Professorship, contract reference IF/00064/2012, funded by FCT/MCTES (Portugal) and POPH/FSE (EC). Some of the results in this paper have been derived using the HEALPix package [131].
Publisher Copyright:
© 2018 The Author(s).
PY - 2018/4/5
Y1 - 2018/4/5
N2 - Lensing of the cosmic microwave background (CMB) is now a well-developed probe of the clustering of the large-scale mass distribution over a broad range of redshifts. By exploiting the non-Gaussian imprints of lensing in the polarization of the CMB, the CORE mission will allow production of 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 will follow from its power spectrum and the cross-correlation with other clustering data. 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 measurements of the baryon acoustic oscillation feature in the clustering of galaxies, three times smaller than the minimum total mass allowed by neutrino oscillation measurements. Lensing has applications across many other science goals of CORE, including the search for B-mode polarization from primordial gravitational waves. Here, lens-induced B-modes will dominate over instrument noise, limiting constraints on the power spectrum amplitude of primordial gravitational waves. With lensing reconstructed by CORE, one can "delens" the observed polarization internally, reducing the lensing B-mode power by 60 %. This can be improved to 70 % by combining lensing and measurements of the cosmic infrared background from CORE, leading to an improvement of a factor of 2.5 in the error on the amplitude of primordial gravitational waves compared to no delensing (in the null hypothesis of no primordial B-modes). Lensing measurements from CORE will allow calibration of the halo masses of the tens of thousands of galaxy clusters that it will find, with constraints dominated by the clean polarization-based estimators. The 19 frequency channels proposed for CORE will allow accurate removal of Galactic emission from CMB maps. 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.
AB - Lensing of the cosmic microwave background (CMB) is now a well-developed probe of the clustering of the large-scale mass distribution over a broad range of redshifts. By exploiting the non-Gaussian imprints of lensing in the polarization of the CMB, the CORE mission will allow production of 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 will follow from its power spectrum and the cross-correlation with other clustering data. 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 measurements of the baryon acoustic oscillation feature in the clustering of galaxies, three times smaller than the minimum total mass allowed by neutrino oscillation measurements. Lensing has applications across many other science goals of CORE, including the search for B-mode polarization from primordial gravitational waves. Here, lens-induced B-modes will dominate over instrument noise, limiting constraints on the power spectrum amplitude of primordial gravitational waves. With lensing reconstructed by CORE, one can "delens" the observed polarization internally, reducing the lensing B-mode power by 60 %. This can be improved to 70 % by combining lensing and measurements of the cosmic infrared background from CORE, leading to an improvement of a factor of 2.5 in the error on the amplitude of primordial gravitational waves compared to no delensing (in the null hypothesis of no primordial B-modes). Lensing measurements from CORE will allow calibration of the halo masses of the tens of thousands of galaxy clusters that it will find, with constraints dominated by the clean polarization-based estimators. The 19 frequency channels proposed for CORE will allow accurate removal of Galactic emission from CMB maps. 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.
KW - CMBR polarization
KW - gravitational lensing
KW - ination
KW - neutrino masses from cosmology
UR - http://www.scopus.com/inward/record.url?scp=85047512082&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2018/04/018
DO - 10.1088/1475-7516/2018/04/018
M3 - Article
SN - 1475-7516
VL - 2018
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 4
M1 - 018
ER -