Results 81 to 90 of about 198,932 (133)
arXiv, 2003 The basic equations and geometry of gravitational lensing are described, as well as the most important contexts in which it is observed in astronomy: strong lensing, weak lensing and microlensing.
arxiv
The Open Journal of AstrophysicsThe apparent angular positions of quasars are deflected on the sky by the gravitational field sourced by foreground matter. This weak lensing effect is measurable through the distortions it introduces in the lensed quasar spectra.
Patrick Shaw +2 more
doaj +1 more source
INTRINSIC GALAXY ALIGNMENTS AND WEAK GRAVITATIONAL LENSING [PDF]
The Shapes of Galaxies and Their Dark Halos, 2002 8 pages.
openaire +4 more sources
Gravitational Lensing in Modified Gravity and the Lensing of Merging Clusters without Dark Matter [PDF]
arXiv, 2006 Gravitational lensing in a modified gravity (MOG) is derived and shown to describe lensing without postulating dark matter. The recent data for merging clusters identified with the interacting cluster 1E0657-56 is shown to be consistent with a weak lensing construction based on MOG without exotic dark matter.
arxiv
A deconstruction of methods to derive one-point lensing statistics
The Open Journal of AstrophysicsGravitational lensing is a crucial tool for exploring cosmic phenomena, providing insights into galaxy clustering, dark matter, and dark energy. Given the substantial computational demands of $N$-body simulations, approximate methods like $\texttt ...
Viviane Alfradique +5 more
doaj +1 more source
Ellipticities of Galaxy Cluster Halos from Halo–Shear–Shear Correlations
The Astrophysical JournalWe report the first detection of the halo ellipticities of galaxy clusters by applying the halo–shear–shear correlations (HSSCs), without the necessity of using major axis determination.
Zhenjie Liu +3 more
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Strong and weak lensing by galaxy clusters [PDF]
arXiv, 2002 I present an overview of strong and weak gravitational lensing by galaxy clusters. After briefly introducing the principles of gravitational lensing, I discuss the main lessons learned from lensing on the mass distribution in clusters and their relation to cosmology.
arxiv
Forecast of Joint Analysis of Cosmic Shear and Supernovae Magnification from the CSST and LSST
The Astrophysical JournalCosmic shear and cosmic magnification reflect the same gravitational lensing field. Each of these two probes are affected by different systematics. We study the auto- and cross-correlations of cosmic shear from the China Space Survey Telescope and cosmic
Ye Cao, Bin Hu, Ji Yao, Hu Zhan
doaj +1 more source
UniverseThe unified Einstein–Euler–Heisenberg theory is utilized to investigate the particle motion and weak gravitational lensing characteristics of black holes.
Allah Ditta +6 more
doaj +1 more source
Self-Gravitating Systems in Extended Gravity
Galaxies, 2014 Starting from the weak field limit, we discuss astrophysical applications of Extended Theories of Gravity where higher order curvature invariants and scalar fields are considered by generalizing the Hilbert-Einstein action linear in the Ricci curvature ...
Arturo Stabile, Salvatore Capozziello
doaj +1 more source