Results 121 to 130 of about 198,976 (177)
What are the parities of photon-ring images near a black hole?
The Open Journal of Astrophysics, 2023 Light that grazes a black-hole event horizon can loop around one or more times before escaping again, resulting for distance observers in an infinite sequence of ever fainter and more delayed images near the black hole shadow. In the case of the M87 and
Ashish Kumar Meena, Prasenjit Saha
doaj +1 more source
The Effects of Weak Gravitational Lensing on Determinations of the Cosmology from Type Ia Supernovæ [PDF]
arXiv, 2001 Underlying cosmologies with deceleration parameter, $q_0=-0.51^{+0.03}_{-0.24},$ may be interpreted as having $q_0=-0.55,$ on the basis of weak gravitational lensing effects.
arxiv
A Smithian Political Economy Approach for the Competition Law of the 21st Century
The Modern Law Review, EarlyView.This study aims to show how a Smithian political economy approach could assist competition law in addressing the challenges of the 21st‐century economy. We revisit Smith's Wealth of Nations to provide a more nuanced understanding of his views, contrasting them with the prevailing libertarian interpretation called here ‘Chicago Smith’.
Stavros Makris
wiley +1 more source
The Astrophysical JournalWe assess the dark matter halo masses of luminous active galactic nuclei (AGNs) over the redshift range 0.2–1.2 using galaxy–galaxy lensing based on imaging data from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP).
Wentao Luo +14 more
doaj +1 more source
Null Geodesics and Gravitational Lensing in a Nonsingular Spacetime
Advances in High Energy Physics, 2015 The null geodesics and gravitational lensing in a nonsingular spacetime are investigated. According to the nature of the null geodesics, the spacetime is divided into several cases.
Shao-Wen Wei, Yu-Xiao Liu, Chun-E Fu
doaj +1 more source
A compilation of weak gravitational lensing studies of clusters of galaxies [PDF]
arXiv, 2007 We present a list of clusters that have had their dark matter content measured using weak gravitational lensing. The list consists of 139 clusters, with weak lensing measurements reported in 64 different publications. Details are provided about the selection criteria and some basic properties of the sample, such as the redshift distribution.
arxiv
Physics Letters BIn this paper, we theoretically investigate gravitational lensing within the space-time framework of traversable wormholes, focusing on the combined effects of a global monopole and a cosmic string.
Faizuddin Ahmed +2 more
doaj
Weak gravitational lensing with SKA
, 1999 I shall outline the basic principles and some observational aspects of weak gravitational lensing, and discuss several applications of this powerful tool in observational cosmology. It will be explained why the applications have been restricted to optical observations up to now, and why SKA is going to change this. I conclude with a few general remarks
openaire +2 more sources
Boreas, EarlyView.Here we report on the properties of a glacial sediment succession including various till facies and some subglacial meltwater deposits from a site in central Poland close to the outermost extent of the Scandinavian Ice Sheet during the last glaciation.
Piotr Hermanowski, Jan A. Piotrowski
wiley +1 more source
Imaging the 3-D cosmological mass distribution with weak gravitational lensing [PDF]
arXiv, 2001 I show how weak gravitational lensing can be used to image the 3-D mass distribution in the Universe. An inverse relation to the lensing equation, relating the lensing potential evaluated at each source to the full 3-D Newtonian potential, is derived.
arxiv