Cosmic shear power spectra in practice
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/03/067
Abstract: Cosmic shear is one of the most powerful probes of Dark Energy, targeted by several current and future galaxy surveys. Lensing shear, however, is only sampled at the positions of galaxies with measured shapes in… read more here.
Keywords: power spectra; spectra practice; shear power; power ... See more keywords
Pixelization effects in cosmic shear angular power spectra
Sign Up to like & getrecommendations! Published in 2025 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2025/05/048
Abstract: We conduct a comprehensive study into the impact of pixelization on cosmic shear, uncovering several sources of bias in standard pseudo-C ℓ estimators based on discrete catalogues. We derive models that can bring residual biases… read more here.
Keywords: show; angular power; power spectra; cosmic shear ... See more keywords
Cosmological consequences of intrinsic alignments supersample covariance
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa3214
Abstract: We examine cosmological constraints from high precision weak lensing surveys including super-sample covariance (SSC) due to the finite survey volume. Specifically, we focus on the contribution of {\it beat coupling} in the intrinsic alignments as… read more here.
Keywords: intrinsic alignments; full cosmic; cosmic shear; consequences intrinsic ... See more keywords
Reconstructing the matter power spectrum with future cosmic shear surveys
Sign Up to like & getrecommendations! Published in 2024 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stae1848
Abstract: Analyses of cosmic shear typically condense weak lensing information over a range of scales to a single cosmological parameter, S8. This paper presents a method to extract more information from Stage-IV cosmic shear measurements by… read more here.
Keywords: cosmic shear; matter power; power; power spectrum ... See more keywords
Joint Modelling of Astrophysical Systematics for Cosmology with LSST Cosmic Shear
Sign Up to like & getrecommendations! Published in 2024 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staf156
Abstract: We present a novel framework for jointly modelling the weak lensing source galaxy redshift distribution and the intrinsic alignment (IA) of galaxies through a shared luminosity function (LF). In the context of a Rubin Observatory’s… read more here.
Keywords: joint modelling; systematics; cosmic shear; lsst cosmic ... See more keywords
The limits of cosmic shear
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx1039
Abstract: In this paper we discuss the commonly-used limiting cases, or approximations, for two-point cosmic shear statistics. We discuss the most prominent assumptions in this statistic: the flat-sky (small angle limit), the Limber (Bessel-to-delta function limit)… read more here.
Keywords: limit; cosmic shear; limits cosmic; power ... See more keywords
Testing (modified) gravity with 3D and tomographic cosmic shear
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/sty2092
Abstract: Author(s): Spurio Mancini, A; Reischke, R; Pettorino, V; Schafer, BM; Zumalacarregui, M | Abstract: © 2018 The Author(s). Cosmic shear is one of the primary probes to test gravity with current and future surveys. There… read more here.
Keywords: analysis; time; modified gravity; cosmic shear ... See more keywords
Implications for the missing low-mass galaxies (satellites) problem from cosmic shear
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnrasl/sly101
Abstract: The number of observed dwarf galaxies, with dark matter mass $\lesssim 10^{11}$ M$_{\odot}$ in the Milky Way or the Andromeda galaxy does not agree with predictions from the successful $\Lambda$CDM paradigm. To alleviate this problem… read more here.
Keywords: satellites problem; dark matter; mass; cosmic shear ... See more keywords
Accessing the high- ℓ frontier under the reduced shear approximation with k -cut cosmic shear
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.083535
Abstract: The precision of Stage IV cosmic shear surveys will enable us to probe smaller physical scales than ever before, however, model uncertainties from baryonic physics and non-linear structure formation will become a significant concern. The… read more here.
Keywords: reduced shear; shear approximation; approximation; cosmic shear ... See more keywords
Dark Energy Survey Year 1 results: cosmological constraints from cosmic shear
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.043528
Abstract: We use 26 million galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg 2 of the sky to produce the most significant measurement of cosmic shear in a galaxy survey… read more here.
Keywords: year; cosmic shear; dark energy; energy survey ... See more keywords
3D cosmic shear: Numerical challenges, 3D lensing random fields generation, and Minkowski functionals for cosmological inference
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.103507
Abstract: Cosmic shear - the weak gravitational lensing effect generated by fluctuations of the gravitational tidal fields of the large-scale structure - is one of the most promising tools for current and future cosmological analyses. The… read more here.
Keywords: random fields; cosmic shear; field; minkowski functionals ... See more keywords