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• W2891877265 abstract "The standard theory of weak gravitational lensing relies on the approximation that light beams are infinitesimal. Our recent work showed that the finite size of sources, and the associated light beams, can cause nonperturbative corrections to the weak-lensing convergence and shear. This article thoroughly investigates these corrections in a realistic cosmological model. The continuous transition from infinitesimal to finite beams is understood, and reveals that the previous results overestimated finite-beam effects due to simplistic assumptions on the distribution of matter in the Universe. In a KiloDegree Survey-like setting, finite-beam corrections to the cosmic shear remain subpercent, while percent-level corrections are only reached on subarcmin scales. This article thus demonstrates the validity of the infinitesimal-beam approximation in the interpretation of current weak-lensing data." @default.
• W2891877265 created "2018-09-27" @default.
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• W2891877265 date "2019-01-28" @default.
• W2891877265 modified "2023-10-18" @default.
• W2891877265 title "Cosmic convergence and shear with extended sources" @default.
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• W2891877265 doi "https://doi.org/10.1103/physrevd.99.023525" @default.
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