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Gravitational Lensing

Smith, Kendrick M. and Cooray, Asantha and Das, Sudeep and Doré, Olivier and Hanson, Duncan and Hirata, Chris and Kaplinghat, Manoj and Keating, Brian and LoVerde, Marilena and Miller, Nathan and Rocha, Graça and Shimon, Meir and Zahn, Oliver (2009) Gravitational Lensing. In: CMB Polarization Workshop; Theory and Foregrounds, CMBPol Mission Concept. AIP Conference Proceedings. No.1141. American Institute of Physics , Melville, NY, pp. 121-178. ISBN 978-0-7354-0678-0. https://resolver.caltech.edu/CaltechAUTHORS:20160506-162450653

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Abstract

Gravitational lensing of the cosmic microwave background by large‐scale structure in the late universe is both a source of cosmological information and a potential contaminant of primordial gravity waves. Because lensing imprints growth of structure in the late universe on the CMB, measurements of CMB lensing will constrain parameters to which the CMB would not otherwise be sensitive, such as neutrino mass. In CMB polarization, gravitational lensing is the largest guaranteed source of B‐mode (or curl‐like) polarization. Future CMB polarization experiments with sufficient sensitivity to measure B‐modes on small angular scales (l ∼ 1000) can measure lensing with better sensitivity, and on different scales, than could be achieved by measuring CMB temperature alone. If the instrumental noise is sufficiently small (≲ 5 μK‐arcmin), the gravitational lensing contribution to the large‐scale B‐mode will be the limiting source of contamination when constraining a stochastic background of gravity waves in the early universe, one of the most exciting prospects for future CMB polarization experiments. High‐sensitivity measurements of small‐scale B‐modes can reduce this contamination through a lens reconstruction technique that separates the lensing and primordial contributions to the B‐mode on large scales. A fundamental design decision for a future CMB polarization experiment such as CMBpol is whether to have coarse angular resolution so that only the large‐scale B‐mode (and the large‐scale E‐mode from reionization) is measured, or high resolution to additionally measure CMB lensing. The purpose of this white paper is to evaluate the science case for CMB lensing in polarization: constraints on cosmological parameters, increased sensitivity to the gravity wave B‐mode via lens reconstruction, expected level of contamination from non‐CMB foregrounds, and required control of beam systematics.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.3160886DOIArticle
http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.3160886PublisherArticle
ORCID:
AuthorORCID
Cooray, Asantha0000-0002-3892-0190
Doré, Olivier0000-0002-5009-7563
Hirata, Chris0000-0002-2951-4932
Additional Information:© 2009 American Institute of Physics. Published online 09 June 2009. This work was organized and initiated at the workshop “CMB Polarization workshop: theory and foregrounds” held at Fermilab from Jun 23-26 2008. We would like to thank the organizers and staff for a stimulating and productive atmosphere. This work was supported by an STFC Postdoctoral Fellowship (KMS), NASA grant NNX08AU21G (AC), NASA grant NNX08AH30G (SD), NSF PHY-0555689 (MK), NSF CAREER/PECASE Award AST-0548262 (BK), and the DOE under DE-FG02-92ER40699 and the Initiatives in Science and Engineering Program at Columbia University (ML).
Funders:
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
NASANNX08AU21G
NASANNX08AH30G
NSFPHY-0555689
NSFAST-0548262
Department of Energy (DOE)DE-FG02-92ER40699
Columbia UniversityUNSPECIFIED
Series Name:AIP Conference Proceedings
Issue or Number:1141
Record Number:CaltechAUTHORS:20160506-162450653
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160506-162450653
Official Citation:Gravitational Lensing Smith, Kendrick M. and Cooray, Asantha and Das, Sudeep and Doré, Olivier and Hanson, Duncan and Hirata, Chris and Kaplinghat, Manoj and Keating, Brian and LoVerde, Marilena and Miller, Nathan and Rocha, Graça and Shimon, Meir and Zahn, Oliver, AIP Conference Proceedings, 1141, 121-178 (2009), DOI:http://dx.doi.org/10.1063/1.3160886
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66718
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:09 May 2016 16:20
Last Modified:03 Oct 2019 09:59

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