Carolina Cuesta-Lazaro
Gravitational corrections to light propagation in a perturbed FLRW-universe and corresponding weak lensing spectra
Cuesta-Lazaro, Carolina; Quera-Bofarull, Arnau; Reischke, Robert; Schaefer, Bjoern Malte
Authors
Arnau Quera-Bofarull
Robert Reischke
Bjoern Malte Schaefer
Abstract
When the gravitational lensing of the large-scale structure is calculated from a cosmological model a few assumptions enter: (i) one assumes that the photons follow unperturbed background geodesics, which is usually referred to as the Born-approximation, (ii) the lenses move slowly, (iii) the source-redshift distribution is evaluated relative to the background quantities and (iv) the lensing effect is linear in the gravitational potential. Even though these approximations are small individually they could sum up, especially since they include local effects such as the Sachs-Wolfe and peculiar motion, but also non-local ones like the Born-approximation and the integrated Sachs-Wolfe effect. In this work we will address all points mentioned and perturbatively calculate the effect on a tomographic cosmic shear power spectrum of each effect individually as well as all cross-correlations. Our findings show that each effect is at least 4 to 5 orders of magnitude below the leading order lensing signal. Finally we sum up all effects to estimate the overall impact on parameter estimation by a future cosmological weak lensing survey such as Euclid in a wCDM cosmology with parametrisation Ωm, σ8, ns, h, w0 and wa, using 5 tomographic bins. We consistently find a parameter bias of 10−5, which is therefore completely negligible for all practical purposes, confirming that other effects such as intrinsic alignments, magnification bias and uncertainties in the redshift distribution will be the dominant systematic source in future surveys.
Citation
Cuesta-Lazaro, C., Quera-Bofarull, A., Reischke, R., & Schaefer, B. M. (2018). Gravitational corrections to light propagation in a perturbed FLRW-universe and corresponding weak lensing spectra. Monthly Notices of the Royal Astronomical Society, 477(1), 741-754. https://doi.org/10.1093/mnras/sty672
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 14, 2018 |
Online Publication Date | Mar 14, 2018 |
Publication Date | Jun 1, 2018 |
Deposit Date | Apr 11, 2018 |
Publicly Available Date | Apr 18, 2018 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 477 |
Issue | 1 |
Pages | 741-754 |
DOI | https://doi.org/10.1093/mnras/sty672 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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