Results 31 to 40 of about 93,016 (319)
Imprint of primordial gravitational wave with extremely low frequency on gravitational lens system [PDF]
, 2022 Primordial gravitational waves with extremely low frequency are expected to origin from inflation in the early Universe. The detection of such kind of gravitational waves is of great significance to verify the inflationary theory and determine the energy scale of inflation.
arxiv +1 more source
Discovery of a Probable Gravitational Lens [PDF]
Symposium - International Astronomical Union, 1989 We report the discovery of a new probable gravitational lens system, associated with the quasar UM 425 = 1120+019, at z = 1.465. The optical image of the system consists of 4 or more components. The two well-observed brightest components have very similar spectra. The difference of the two spectra (scaled appropriately) is consistent with a spectrum of
Meylan, G., Djorgovski, S.
openaire +4 more sources
Numerical Investigation on Magnetically Actuated Tunable Micro Liquid Lens [PDF]
MATEC Web of Conferences, 2020 In this paper, magnetically actuated tunable liquid lens is fundamentally studied to have further potential application scope in research, industrial, aeronautical and astronautical areas.
Wu Shi-Hua, Zhu Gui-Ping, Huang Hu-Lin
doaj +1 more source
Gravitational Lens System as a Long Baseline Detector of Extremely Low Frequency Primordial Gravitational Wave [PDF]
arXiv, 2022 The effect of extremely low frequency primordial gravitational wave with arbitrary direction of propagation on a non-aligned gravitational lens system is investigated. From the point of view of real astrophysical lens model, singular isothermal sphere lens model is adopted in the gravitational lens system.
arxiv
A VLA Gravitational Lens Survey [PDF]
Symposium - International Astronomical Union, 1987 Gravitational lens surveys are of cosmological interest because they provide a way to measure the gravitational field of both luminous and dark matter. Many of the other methods used to detect the presence of dark matter, such as studies of galaxy rotation curves and cluster dynamics, require that there be luminous objects in the gravitational field ...
James E. Gunn +6 more
openaire +2 more sources
The Effects of Finite Distance on the Gravitational Deflection Angle of Light
Universe, 2019 In order to clarify the effects of the finite distance from a lens object to a light source and a receiver, the gravitational deflection of light has been recently reexamined by using the Gauss−Bonnet (GB) theorem in differential geometry (Ishihara
Toshiaki Ono, Hideki Asada
doaj +1 more source
The Astrophysical Journal, 2023 Modeling strong gravitational lenses in order to quantify distortions in the images of background sources and to reconstruct the mass density in foreground lenses has been a difficult computational challenge.
Alexandre Adam +3 more
doaj +1 more source
Can a Gravitational Lens Magnify Gravity? A Possible Solar System Test [PDF]
Astrophys.J. 628 (2005) 1081-1085, 2005 Can a gravitational lens magnify gravity? Leading theories of gravity likely indicate "no", but the possibility might be testable by using our Sun as a gravitational lens and carefully aligning a satellite past the minimum transparent focal distance of about 25 AU. Here the magnitude of a maximal effect is estimated and found potentially observable.
arxiv +1 more source
Discovery of a new gravitational lens [PDF]
The Astrophysical Journal, 1984 On a trouve que le QSO double, faible 1635+267 A, B est pratiquement au meme deplacement vers le rouge z=1,961±0,003. La difference des deplacements vers le rouge, determinee par une technique de correlation croisee est de (3,2±8,5)×10 −4 , correspondant a une difference de vitesses de (33±86) kms −1 seulement. Cette faible valeur et la similitude des
Djorgovski, S., Spinrad, H.
openaire +4 more sources
The cosmological lens equation and the equivalent single-plane gravitational lens [PDF]
, 1997 The gravitational lens equation resulting from a single (non-linear) mass concentration (the main lens) plus inhomogeneities of the large-scale structure is shown to be strictly equivalent to the single-plane gravitational lens equation without the cosmological perturbations.
arxiv +1 more source