Results 31 to 40 of about 321 (113)
Strong gravitational lensing with Gauss-Bonnet correction [PDF]
Journal of Cosmology and Astroparticle Physics, 2014 In this paper we investigate the strong gravitational lensing with Gauss-Bonnet gravity. By considering the logarithmic term for deflection angle, we obtain the deflection angle $\hatα$ and corresponding parameters $\bar{a}$ and $\bar{b}$. Finally, by using the relations between the observables and lensing parameters, we estimate the observables such ...
Sadeghi, J., Vaez, H.
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Gravitational Shear, Flexion, and Strong Lensing in Abell 1689 [PDF]
The Astrophysical Journal, 2007 We present a gravitational lensing analysis of the galaxy cluster Abell 1689, incorporating measurements of the weak shear, flexion, and strong lensing induced in background galaxies. This is the first time that a shapelet technique has been used to reconstruct the distribution of mass in this cluster, and the first time that a flexion signal has been ...
Leonard, Adrienne +3 more
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Herschel ★ -ATLAS: modelling the first strong gravitational lenses [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 14 pages, 7 figures, MNRAS ...
Dye, S. +16 more
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Strong gravitational lensing by a charged Kiselev black hole [PDF]
The European Physical Journal C, 2017 We study the gravitational lensing scenario where the lens is a spherically symmetric charged black hole (BH) surrounded by quintessence matter. The null geodesic equations in the curved background of the black hole are derived. The resulting trajectory equation is solved analytically via perturbation and series methods for special choice of parameters
Azreg-Aïnou, Mustapha +2 more
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Strong gravitational lensing and dark energy complementarity [PDF]
Physical Review D, 2004 In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation between its present value w_0 and time variation w_a.
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Strong gravitational lensing and dynamical dark energy [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 8 pages, 11 figures. Lensing map resolution improved and effects of resolution discussed. One more RP model analysed.
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Strong gravitational lensing of gravitational waves in Einstein Telescope [PDF]
Journal of Cosmology and Astroparticle Physics, 2013 13 pages, 4 figures, accepted to ...
Piórkowska, Aleksandra +2 more
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Strong gravitational lensing’s ‘external shear’ is not shear
Monthly Notices of the Royal Astronomical SocietyABSTRACT The distribution of mass in galaxy-scale strong gravitational lenses is often modelled as an elliptical power-law plus ‘external shear’, which notionally accounts for neighbouring galaxies and cosmic shear along our line of sight.
Amy Etherington +22 more
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Strong Gravitational Lensing: Bright Galaxies & Lost Dark-Matter [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractGravitational lensing and stellar dynamics provide two complementary methods to probe the smooth and clumpy stellar and dark-matter mass distribution in early-type galaxies, currently already over a range of two orders of magnitude in virial mass, more than ten orders of magnidude in dynamic mass range in each galaxy (i.e.
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Strong Gravitational Lensing Parameter Estimation with Vision Transformer
, 2023 Quantifying the parameters and corresponding uncertainties of hundreds of strongly lensed quasar systems holds the key to resolving one of the most important scientific questions: the Hubble constant ($H_{0}$) tension. The commonly used Markov chain Monte Carlo (MCMC) method has been too time-consuming to achieve this goal, yet recent work has shown ...
Kuan-Wei Huang +6 more
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