Exploring cosmic origins with CORE: Gravitational lensing of the CMB

CORE

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number018
JournalJournal of Cosmology and Astroparticle Physics
Volume2018
Issue number4
DOIs
Publication statusPublished - 5 Apr 2018
Externally publishedYes

Fingerprint

microwaves
gravitational waves
power spectra
polarization
neutrinos
null hypothesis
galaxies
oscillations
mass distribution
estimators
cross correlation
sky
deflection
baryons
halos
contamination
lenses
acoustics
probes
products

Keywords

  • CMBR polarization
  • gravitational lensing
  • ination
  • neutrino masses from cosmology

Cite this

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title = "Exploring cosmic origins with CORE: Gravitational lensing of the CMB",
abstract = "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.",
keywords = "CMBR polarization, gravitational lensing, ination, neutrino masses from cosmology",
author = "CORE and A. Challinor and R. Allison and J. Carron and J. Errard and S. Feeney and T. Kitching and J. Lesgourgues and A. Lewis and I. Zubeldia and A. Achucarro and P. Ade and M. Ashdown and M. Ballardini and Banday, {A. J.} and R. Banerji and J. Bartlett and N. Bartolo and S. Basak and D. Baumann and M. Bersanelli and A. Bonaldi and M. Bonato and J. Borrill and F. Bouchet and F. Boulanger and T. Brinckmann and M. Bucher and C. Burigana and A. Buzzelli and Cai, {Z. Y.} and M. Calvo and Carvalho, {C. S.} and G. Castellano and J. Chluba and S. Clesse and I. Colantoni and A. Coppolecchia and M. Crook and G. D'Alessandro and {De Bernardis}, P. and {De Gasperis}, G. and Zotti, {G. De} and J. Delabrouille and Valentino, {E. Di} and Diego, {J. M.} and R. Fernandez-Cobos and S. Ferraro and F. Finelli and F. Forastieri and S. Galli",
year = "2018",
month = "4",
day = "5",
doi = "10.1088/1475-7516/2018/04/018",
language = "English",
volume = "2018",
journal = "JCAP",
issn = "1475-7516",
publisher = "IOP Publishing Ltd.",
number = "4",

}

Exploring cosmic origins with CORE : Gravitational lensing of the CMB. / CORE.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2018, No. 4, 018, 05.04.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Exploring cosmic origins with CORE

T2 - Gravitational lensing of the CMB

AU - CORE

AU - Challinor, A.

AU - Allison, R.

AU - Carron, J.

AU - Errard, J.

AU - Feeney, S.

AU - Kitching, T.

AU - Lesgourgues, J.

AU - Lewis, A.

AU - Zubeldia, I.

AU - Achucarro, A.

AU - Ade, P.

AU - Ashdown, M.

AU - Ballardini, M.

AU - Banday, A. J.

AU - Banerji, R.

AU - Bartlett, J.

AU - Bartolo, N.

AU - Basak, S.

AU - Baumann, D.

AU - Bersanelli, M.

AU - Bonaldi, A.

AU - Bonato, M.

AU - Borrill, J.

AU - Bouchet, F.

AU - Boulanger, F.

AU - Brinckmann, T.

AU - Bucher, M.

AU - Burigana, C.

AU - Buzzelli, A.

AU - Cai, Z. Y.

AU - Calvo, M.

AU - Carvalho, C. S.

AU - Castellano, G.

AU - Chluba, J.

AU - Clesse, S.

AU - Colantoni, I.

AU - Coppolecchia, A.

AU - Crook, M.

AU - D'Alessandro, G.

AU - De Bernardis, P.

AU - De Gasperis, G.

AU - Zotti, G. De

AU - Delabrouille, J.

AU - Valentino, E. Di

AU - Diego, J. M.

AU - Fernandez-Cobos, R.

AU - Ferraro, S.

AU - Finelli, F.

AU - Forastieri, F.

AU - Galli, 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

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