Toward an Optimal Reconstruction of the Shear Field with PDF-folding
The Astrophysical Journal, 2023 Weak lensing provides a direct way of mapping the density distribution in the Universe. To reconstruct the density field from the shear catalog, an important step is to build the shear field from the shear catalog, which can be quite nontrivial due to ...
Haoran Wang +3 more
doaj +1 more source
Weak Gravitational Lensing around Bardeen Black Hole with a String Cloud in the Presence of Plasma
Symmetry, 2023 The effect of spacetime curvature on optical properties may provide an opportunity to suggest new tests for gravity theories. In this paper, we investigated gravitational weak lensing around a Bardeen black hole with the string clouds parameter.
Farruh Atamurotov +4 more
semanticscholar +1 more source
Testing Velocity-field Lensing on IllustrisTNG Galaxies
The Astrophysical Journal, 2023 Weak gravitational lensing shear could be measured far more precisely if information about unlensed attributes of source galaxies were available. Disk galaxy velocity fields supply such information, at least in principle, with idealized models predicting
Jean Donet, David Wittman
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KiDS-450: cosmological parameter constraints from tomographic weak gravitational lensing [PDF]
, 2016 We present cosmological parameter constraints from a tomographic weak gravitational lensing analysis of ~450deg$^2$ of imaging data from the Kilo Degree Survey (KiDS).
H. Hildebrandt +35 more
semanticscholar +1 more source
Circular orbit of a particle and weak gravitational lensing [PDF]
Physical Review D, 2020 The purpose of this paper is twofold. First, we introduce a geometric approach to study the circular orbit of a particle in static and spherically symmetric spacetime based on Jacobi metric.
Zonghai Li, Guodong Zhang, A. Övgün
semanticscholar +1 more source
KiDS-1000 methodology: Modelling and inference for joint weak gravitational lensing and spectroscopic galaxy clustering analysis [PDF]
Astronomy & Astrophysics, 2020 We present the methodology for a joint cosmological analysis of weak gravitational lensing from the fourth data release of the ESO Kilo-Degree Survey (KiDS-1000) and galaxy clustering from the partially overlapping Baryon Oscillation Spectroscopic Survey
B. Joachimi +26 more
semanticscholar +1 more source
Detecting and Characterizing Young Quasars. III. The Impact of Gravitational Lensing Magnification
The Astrophysical Journal, 2023 We test the impact of gravitational lensing on the lifetime estimates of seven high-redshift quasars at redshift z ≳ 6. The targeted quasars are identified by their small observed proximity zone sizes, which indicate extremely short quasar lifetimes ( t ...
Minghao Yue +10 more
doaj +1 more source
Image Simulations for Strong and Weak Gravitational Lensing [PDF]
Symmetry, 2020 Gravitational lensing has been identified as a powerful tool to address fundamental problems in astrophysics at different scales, ranging from exoplanet identification to dark energy and dark matter characterization in cosmology.
A. Plazas
semanticscholar +1 more source
Weak Gravitational Lensing by Voids [PDF]
, 1998 We consider the prospects for detecting weak gravitational lensing by underdensities (voids) in the large-scale matter distribution. We derive the basic expressions for magnification and distortion by spherical voids. Clustering of the background sources
Amendola, Luca +2 more
core +2 more sources
Dark Matter as Gravitational Solitons in the Weak Field Limit
Universe, 2020 In this paper, we will describe the idea that dark matter partly consists of gravitational solitons (gravisolitons). The corresponding solution is valid for weak gravitational fields (weak field limit) with respect to a background metric.
Torsten Asselmeyer-Maluga, Jerzy Król
doaj +1 more source