Header

UZH-Logo

Maintenance Infos

Impact of Next-to-Leading Order Contributions to Cosmic Microwave Background Lensing


Marozzi, Giovanni; Fanizza, Giuseppe; Di Dio, Enea; Durrer, Ruth (2017). Impact of Next-to-Leading Order Contributions to Cosmic Microwave Background Lensing. Physical Review Letters, 118(21):211301.

Abstract

In this Letter we study the impact on cosmological parameter estimation, from present and future surveys, due to lensing corrections on cosmic microwave background temperature and polarization anisotropies beyond leading order. In particular, we show how post-Born corrections, large-scale structure effects, and the correction due to the change in the polarization direction between the emission at the source and the detection at the observer are non-negligible in the determination of the polarization spectra. They have to be taken into account for an accurate estimation of cosmological parameters sensitive to or even based on these spectra. We study in detail the impact of higher order lensing on the determination of the tensor-to-scalar ratio r and on the estimation of the effective number of relativistic species Neff. We find that neglecting higher order lensing terms can lead to misinterpreting these corrections as a primordial tensor-to-scalar ratio of about O(10−3). Furthermore, it leads to a shift of the parameter Neff by nearly 2σ considering the level of accuracy aimed by future S4 surveys.

Abstract

In this Letter we study the impact on cosmological parameter estimation, from present and future surveys, due to lensing corrections on cosmic microwave background temperature and polarization anisotropies beyond leading order. In particular, we show how post-Born corrections, large-scale structure effects, and the correction due to the change in the polarization direction between the emission at the source and the detection at the observer are non-negligible in the determination of the polarization spectra. They have to be taken into account for an accurate estimation of cosmological parameters sensitive to or even based on these spectra. We study in detail the impact of higher order lensing on the determination of the tensor-to-scalar ratio r and on the estimation of the effective number of relativistic species Neff. We find that neglecting higher order lensing terms can lead to misinterpreting these corrections as a primordial tensor-to-scalar ratio of about O(10−3). Furthermore, it leads to a shift of the parameter Neff by nearly 2σ considering the level of accuracy aimed by future S4 surveys.

Statistics

Citations

Dimensions.ai Metrics
7 citations in Web of Science®
5 citations in Scopus®
4 citations in Microsoft Academic
Google Scholar™

Altmetrics

Downloads

6 downloads since deposited on 23 Feb 2018
6 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:23 Feb 2018 07:48
Last Modified:19 Aug 2018 14:11
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Green
Publisher DOI:https://doi.org/10.1103/PhysRevLett.118.211301
Project Information:
  • : FunderH2020
  • : Grant ID680886
  • : Project TitleGREinGC - General Relativistic Effect in Galaxy Clustering as a Novel Probe of Inflationary Cosmology

Download

Download PDF  'Impact of Next-to-Leading Order Contributions to Cosmic Microwave Background Lensing'.
Preview
Content: Published Version
Filetype: PDF
Size: 286kB
View at publisher