A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing
We present a constraint on the tensor-to-scalar ratio, r, derived from measurements of cosmic microwave background (CMB) polarization B-modes with “delensing,” whereby the uncertainty on r contributed by the sample variance of the gravitational lensing B-modes is reduced by cross-correlating against...
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ftosti:oai:osti.gov:1765126 2023-07-30T04:06:54+02:00 A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing Ade, P. A.R. 2022-05-30 application/pdf http://www.osti.gov/servlets/purl/1765126 https://www.osti.gov/biblio/1765126 https://doi.org/10.1103/PhysRevD.103.022004 unknown http://www.osti.gov/servlets/purl/1765126 https://www.osti.gov/biblio/1765126 https://doi.org/10.1103/PhysRevD.103.022004 doi:10.1103/PhysRevD.103.022004 79 ASTRONOMY AND ASTROPHYSICS 2022 ftosti https://doi.org/10.1103/PhysRevD.103.022004 2023-07-11T10:01:15Z We present a constraint on the tensor-to-scalar ratio, r, derived from measurements of cosmic microwave background (CMB) polarization B-modes with “delensing,” whereby the uncertainty on r contributed by the sample variance of the gravitational lensing B-modes is reduced by cross-correlating against a lensing B-mode template. This template is constructed by combining an estimate of the polarized CMB with a tracer of the projected large-scale structure. The large-scale-structure tracer used is a map of the cosmic infrared background derived from Planck satellite data, while the polarized CMB map comes from a combination of South Pole Telescope, bicep/Keck, and Planck data. We expand the bicep/Keck likelihood analysis framework to accept a lensing template and apply it to the bicep/Keck dataset collected through 2014 using the same parametric foreground modeling as in the previous analysis. From simulations, we find that the uncertainty on r is reduced by ~10%, from σ(r)=0.024 to 0.022, which can be compared with a ~26% reduction obtained when using a perfect lensing template or if there were zero lensing B-modes. Applying the technique to the real data, the constraint on r is improved from r0.05<0.090 to r0.05<0.082 (95% C.L.). This is the first demonstration of improvement in an r constraint through delensing. Other/Unknown Material South pole SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) South Pole Physical Review D 103 2 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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79 ASTRONOMY AND ASTROPHYSICS |
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79 ASTRONOMY AND ASTROPHYSICS Ade, P. A.R. A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing |
topic_facet |
79 ASTRONOMY AND ASTROPHYSICS |
description |
We present a constraint on the tensor-to-scalar ratio, r, derived from measurements of cosmic microwave background (CMB) polarization B-modes with “delensing,” whereby the uncertainty on r contributed by the sample variance of the gravitational lensing B-modes is reduced by cross-correlating against a lensing B-mode template. This template is constructed by combining an estimate of the polarized CMB with a tracer of the projected large-scale structure. The large-scale-structure tracer used is a map of the cosmic infrared background derived from Planck satellite data, while the polarized CMB map comes from a combination of South Pole Telescope, bicep/Keck, and Planck data. We expand the bicep/Keck likelihood analysis framework to accept a lensing template and apply it to the bicep/Keck dataset collected through 2014 using the same parametric foreground modeling as in the previous analysis. From simulations, we find that the uncertainty on r is reduced by ~10%, from σ(r)=0.024 to 0.022, which can be compared with a ~26% reduction obtained when using a perfect lensing template or if there were zero lensing B-modes. Applying the technique to the real data, the constraint on r is improved from r0.05<0.090 to r0.05<0.082 (95% C.L.). This is the first demonstration of improvement in an r constraint through delensing. |
author |
Ade, P. A.R. |
author_facet |
Ade, P. A.R. |
author_sort |
Ade, P. A.R. |
title |
A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing |
title_short |
A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing |
title_full |
A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing |
title_fullStr |
A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing |
title_full_unstemmed |
A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing |
title_sort |
demonstration of improved constraints on primordial gravitational waves with delensing |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1765126 https://www.osti.gov/biblio/1765126 https://doi.org/10.1103/PhysRevD.103.022004 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://www.osti.gov/servlets/purl/1765126 https://www.osti.gov/biblio/1765126 https://doi.org/10.1103/PhysRevD.103.022004 doi:10.1103/PhysRevD.103.022004 |
op_doi |
https://doi.org/10.1103/PhysRevD.103.022004 |
container_title |
Physical Review D |
container_volume |
103 |
container_issue |
2 |
_version_ |
1772819857473011712 |