In this study,we examine the effects of weak gravitational lensing and determine the shadow radius around black holes within the Dyonic ModMax(DM)spacetime,also accounting for models with nonuniform plasma distributio...In this study,we examine the effects of weak gravitational lensing and determine the shadow radius around black holes within the Dyonic ModMax(DM)spacetime,also accounting for models with nonuniform plasma distributions.By analyzing various gravitational lens models,we compare corrections to vacuum lensing due to gravitational effects within plasma and plasma inhomogeneity,finding that these effects could be observed in hot gas within galaxy clusters.Starting with the orbits of photons around a black hole in DM,we investigate the shadow and weak gravitational lensing phenomena.Utilizing observational data from the Event Horizon Telescope for M87*and SgrA*,we constrain parameters within DM gravity.To connect our findings to observations,we examine the magnification and positioning of lensed images,along with the weak deflection angle and magnification for sources near different galaxies.展开更多
We investigated the shadow and weak gravitational lensing for the quantum-improved charged black hole(BH).First,the photon motion and BH shadow were studied in a plasma medium.It can be seen from our analysis that the...We investigated the shadow and weak gravitational lensing for the quantum-improved charged black hole(BH).First,the photon motion and BH shadow were studied in a plasma medium.It can be seen from our analysis that the radius of the photon sphere of the quantum-improved charged BH and size of the BH shadow decrease under the influence of the plasma parameter.Furthermore,the gravitational weak lensing is considered for the quantum-improved charged BH,and we have obtained the deflection angle of light rays around a compact object for uniform and non-uniform plasma cases.It is shown that the value of the deflection angle for uniform plasma increases with increasing plasma parameter,and vice versa for non-uniform plasma.It has been also indicated that under the influence of the plasma parameter and BH charge,the values of the deflection angles for the two cases decrease.Finally,we investigated the magnification of image brightness using the deflection angle of the light rays around the quantum-improved charged BH.展开更多
基金partly supported by Research Grants FZ-20200929344 and F-FA-2021-510 of the Uzbekistan Ministry for Innovative DevelopmentTUBITAKSCOAP3 for their support。
文摘In this study,we examine the effects of weak gravitational lensing and determine the shadow radius around black holes within the Dyonic ModMax(DM)spacetime,also accounting for models with nonuniform plasma distributions.By analyzing various gravitational lens models,we compare corrections to vacuum lensing due to gravitational effects within plasma and plasma inhomogeneity,finding that these effects could be observed in hot gas within galaxy clusters.Starting with the orbits of photons around a black hole in DM,we investigate the shadow and weak gravitational lensing phenomena.Utilizing observational data from the Event Horizon Telescope for M87*and SgrA*,we constrain parameters within DM gravity.To connect our findings to observations,we examine the magnification and positioning of lensed images,along with the weak deflection angle and magnification for sources near different galaxies.
基金Supported partly by Grants F-FA-2021-432,F-FA-2021-510,and MRB-2021-527 of the Ministry of Higher Education,Science and Innovations of the Republic of Uzbekistan。
文摘We investigated the shadow and weak gravitational lensing for the quantum-improved charged black hole(BH).First,the photon motion and BH shadow were studied in a plasma medium.It can be seen from our analysis that the radius of the photon sphere of the quantum-improved charged BH and size of the BH shadow decrease under the influence of the plasma parameter.Furthermore,the gravitational weak lensing is considered for the quantum-improved charged BH,and we have obtained the deflection angle of light rays around a compact object for uniform and non-uniform plasma cases.It is shown that the value of the deflection angle for uniform plasma increases with increasing plasma parameter,and vice versa for non-uniform plasma.It has been also indicated that under the influence of the plasma parameter and BH charge,the values of the deflection angles for the two cases decrease.Finally,we investigated the magnification of image brightness using the deflection angle of the light rays around the quantum-improved charged BH.
