Results 151 to 160 of about 64,331 (279)
The weakly perturbed Schwarzschild lens in the strong deflection limit
, 2006 We investigate the strong deflection limit of gravitational lensing by a Schwarzschild black hole embedded in an external gravitational field. The study of this model, analogous to the Chang & Refsdal lens in the weak deflection limit, is important to ...
C. Darwin +5 more
core +1 more source
The simplicity of physical laws
Noûs, EarlyView.Abstract Physical laws are strikingly simple, yet there is no a priori reason for them to be so. I propose that nomic realists—Humeans and non‐Humeans—should recognize simplicity as a fundamental epistemic guide for discovering and evaluating candidate physical laws.
Eddy Keming Chen
wiley +1 more source
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
Policy Studies Journal, EarlyView.ABSTRACT Policy subsystems are comprised of competing advocacy coalitions, in which public and private political actors with shared belief systems learn from each other and coordinate their strategies in the pursuit of influencing policy making in their favor.
Kristijan Garic, Philip Leifeld
wiley +1 more source
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 Lensing Analysis of A2390 Using Short Exposures
The Astrophysical JournalWe present a weak lensing analysis of the galaxy cluster A2390 at z = 0.23 using second moment shape measurements made in 411 short 60 s exposures. The exposures are obtained in three broadband photometric filters ( g , r , and i ) using WIYN-ODI.
A. Dutta +6 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
Impact of blending on weak lensing measurements with the Vera C. Rubin Observatory [PDF]
EPJ Web of ConferencesUpcoming deep optical surveys such as the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will scan the sky to unprecedented depths and detect billions of galaxies.
Ramel M., Doux C., Kuna M.
doaj +1 more source
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
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