Results 91 to 100 of about 1,065 (217)
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
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
Shadow revisiting and weak gravitational lensing with Chern-Simons modification
Physics Letters B, 2023 Dynamical Chern-Simons (dCS) gravity has been attracting plenty of attentions due to the fact that it is a parity-violating modified theory of gravity that corresponds to a well-posed effective field theory in weak coupling approximation.
Yuan Meng +3 more
doaj
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
Probing a regular non-minimal Einstein-Yang-Mills black hole with gravitational lensings
Physics Letters B, 2019 We investigate weak and strong deflection gravitational lensings of the regular black hole predicted by a non-minimal Einstein–Yang–Mills theory. We find that its weak deflection lensing is the same as a Reissner–Nordström black hole's.
Feng-Yuan Liu +3 more
doaj
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
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
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