Results 21 to 30 of about 2,953 (244)
Weak gravitational lensing by stringy black holes [PDF]
The European Physical Journal Plus, 2019 In this paper, we discuss the weak gravitational lensing in the context of stringy black holes. Initially, we examine the deflection angle of photon by charged stringy black hole. For this desire, we compute the Gaussian optical curvature and implement the Gauss-Bonnet theorem to investigate the deflection angle for spherically balanced spacetime of ...
Wajiha Javed +3 more
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Combined strong and weak gravitational lensing mass measurements in clusters of galaxies [PDF]
, 2022 Gravitational lensing in clusters of galaxies is one of the most powerful methods to probe the dark matter mass distribution inside such systems, after mapping the baryonic component, and test the currently accepted ΛCDM cosmological paradigm.
Abriola D.
core +1 more source
Gravitational lensing effects of black hole with conformally coupled scalar hair
European Physical Journal C: Particles and Fields, 2023 In this paper, we investigate the gravitational lensing effects in the weak and strong field limits of a static black hole with conformally coupled scalar field.
Qi Qi +3 more
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Light on dark matter with weak gravitational lensing [PDF]
IEEE Signal Processing Magazine, 2010 This paper reviews statistical methods recently developed to reconstruct and analyze dark matter mass maps from weak lensing observations. The field of weak lensing is motivated by the observations made in the last decades showing that the visible matter represents only about 4-5% of the Universe, the rest being dark.
Sandrine Pires +2 more
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Time delay of photons coupled to Weyl tensor in a regular phantom black hole
European Physical Journal C: Particles and Fields, 2020 Time delay of the photons coupled to the Weyl tensor in a regular phantom black hole is investigated in both weak and strong deflection gravitational lensing. We find that the time delay in the weak deflection lensing strongly depends on the phantom hair
Xu Lu, Yi Xie
doaj +1 more source
Simulations of weak gravitational lensing [PDF]
Astroparticle Physics, 2004 15 pages, 9 figures, Astroparticle Physics in ...
White, Martin, Vale, Chris
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Optimizing tomography for weak gravitational lensing surveys [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT The subject of this paper is optimization of weak lensing tomography: we carry out numerical minimization of a measure of total statistical error as a function of the redshifts of the tomographic bin edges by means of a Nelder–Mead algorithm in order to optimize the sensitivity of weak lensing with respect to different ...
Marvin Sipp +2 more
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, 2020 In this presentation I review cosmological measurements with weak gravitational lensing using the cosmic shear technique. An intriguing tension in the parameter S8=sigma8*sqrt(Omega_m/0.3) between low-z large-scale-structure probes and the Planck primary CMB probes has been observed. This is reminiscent of the well-known H0 tension, albeit currently at
Daniel Gruen +2 more
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Gravitational lensing by a quantum deformed Schwarzschild black hole
European Physical Journal C: Particles and Fields, 2021 We investigate the weak and strong deflection gravitational lensing by a quantum deformed Schwarzschild black hole and find their observables. These lensing observables are evaluated and the detectability of the quantum deformation is assessed, after ...
Xu Lu, Yi Xie
doaj +1 more source
Weak Gravitational Lensing by Galaxies [PDF]
The Astrophysical Journal, 1996 We report a detection of weak, tangential distortion of the images of cosmologically distant, faint galaxies due to gravitational lensing by foreground galaxies. A mean image polarization of ({ital p})=0.011{plus_minus}0.006 (95{percent} confidence bounds) is obtained for 3202 pairs of source (23{lt}{ital r}{sub {ital s}}{le}24) and lens (20{le}{ital r}
Brainerd, Tereasa G. +2 more
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