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A regular MOG black hole's impact on shadows and gravitational weak lensing in the presence of a quintessence field

Communications in Theoretical Physics 2024年第8期76卷 91-102页

作者： Ahmad Al-Badawi Sanjar Shaymatov mirzabek alloqulov Anzhong Wang Department of Physics Al-Hussein Bin Talal UniversityPO Box:2071111Ma’anJordan Institute for Theoretical Physics and Cosmology Zhejiang University of TechnologyHangzhou 310023China Tashkent State Technical University Tashkent 100095Uzbekistan University of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan New Uzbekistan University Movarounnahr Street 1Tashkent 100000Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan GCAP-CASPER Physics DepartmentBaylor UniversityWacoTX 76798-7316United States of America

We investigate the impact of the modified gravity(MOG)field and the quintessence scalar field on horizon evolution,black hole(BH)shadow and the weak gravitational lensing around a static spherically symmetric *** first begin to write the BH metric associated with the MOG parameter and quintessence scalar *** then determine the BH shadow and obtain numerical solutions for the photon sphere and shadow *** show that the MOG(α)and the quintessence(c)parameters have a significant impact on the BH shadow and photon *** on the analysis,we further show that the combined effects of the MOG parameter and quintessence field can increase the values of BH shadow and photon sphere *** also obtain constraints on the BH parameters by applying the observational data of Sgr A^(★)and M87^(★).Finally,we consider the weak deflection angle of BH within the context of the Gauss-Bonnet theorem(GBT)and show that the combined effects of the MOG and quintessence parameters do make the value of the deflection angle increase,and find this remarkable property is in good agreement with the physical meaning of both parameters that can maintain the strong gravitational field in the surrounding environment of a BH.

关键词： modified gravity shadows gravitational weak lensing quintessence field

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Shadows and weak gravitational lensing for black holes within Einstein-Maxwell-scalar theory

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Chinese Physics C 2024年第9期48卷 234-243页

作者： Ahmad Al-Badawi mirzabek alloqulov Sanjar Shaymatov Bobomurat Ahmedov Department of Physics Al-Hussein Bin Talal UniversityP.O.Box:20Ma'an 71111Jordan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan University of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan Institute for Theoretical Physics and Cosmology Zhejiang University of TechnologyHangzhou 310023China Western Caspian University Baku AZ1001Azerbaijan

In this study,we investigated the optical properties of charged black holes within the Einstein-Maxwellscalar(EMS)*** evaluated the shadow cast by these black holes and obtained analytical solutions for both the radius of the photon sphere and that of the *** observed that black hole parametersγandβboth influence the shadow of black *** also found that the photon sphere and shadow radius increase as a consequence of the presence of the parameterγ.Interestingly,the shadow radius decreases first and then remains unchanged owing to the impact of the parameterβ.Finally,we analyzed the weak gravitational lensing and total magnification of lensed images around black *** found that the charge of the black holes and the parameterβboth have a significant impact,reducing the deflection ***,the same behavior for the total magnification was observed,also as a result of the effect of the charge of the black holes and the parameterβ.

关键词： Einstein Maxwell gravity shadow gravitational weak lensing

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Radiation properties of the accretion disk around a black hole in Einstein-Maxwell-scalar theory

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Chinese Physics C 2024年第2期48卷 162-170页

作者： mirzabek alloqulov Sanjar Shaymatov Bobomurat Ahmedov Abdul Jawad New Uzbekistan University Movarounnahr street 1Tashkent 100000Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan University of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan Institute for Theoretical Physics and Cosmology Zhejiang University of TechnologyHangzhou 310023China Central Asian University Milliy Bog Street 264Tashkent 111221Uzbekistan National University of Uzbekistan Tashkent 100174Uzbekistan Power Engineering Faculty Tashkent State Technical UniversityTashkent 100095Uzbekistan Ulugh Beg Astronomical Institute Astronomy St 33Tashkent 100052Uzbekistan Institute of Theoretical Physics National University of UzbekistanTashkent 100174Uzbekistan Department of Mathematics COMSATS University IslamabadLahore CampusLahore-54000Pakistan

In this study,we explore the properties of a non-rotating black hole in the Einstein-Maxwell-scalar(EMS)theory and investigate the luminosity of the accretion disk surrounding *** determine all the orbital parameters of particles in the accretion disk,including the radius of the innermost stable circular orbit(ISCO)with angular velocity,angular momentum,and ***,we study the radiative efficiency for different values of black hole ***,we analyze the flux,differential luminosity,and temperature of the accretion disk.

关键词： Einstein-Maxwell-scalar theory black hole accretion disk

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Shadow and weak gravitational lensing for Ellis-Bronnikov wormhole

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Chinese Physics C 2024年第2期48卷 183-194页

作者： mirzabek alloqulov Farruh Atamurotov Ahmadjon Abdujabbarov Bobomurat Ahmedov Vokhid Khamidov New Uzbekistan University Movarounnahr street 1Tashkent 100000Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan Ulugh Beg Astronomical Institute Astronomy St 33Tashkent 100052Uzbekistan Central Asian University Milliy Bog’Street 264Tashkent 111221Uzbekistan University of Public Safety of the Republic of Uzbekistan Tashkent Region 100109Uzbekistan Institute of Theoretical Physics National University of UzbekistanTashkent 100174Uzbekistan University of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan Tashkent University of Information Technologies named after Muhammad al Khwarizmi Amir Temur 108Tashkent 100014Uzbekistan

In this study,we investigated the gravitational weak lensing and shadow of the Ellis-Bronnikov ***,we studied the photon motion in a plasma medium and a wormhole *** was shown that the radius of the photon sphere of the Ellis-Bronnikov wormhole and the size of the wormhole shadow become larger under the influence of the parameter *** upper limit of the parameter a in the Ellis-Bronnikov wormhole spacetime was ***,we investigated the weak gravitational lensing for the Ellis-Bronnikov wormhole and calculated the deflection angle for uniform and non uniform plasma *** value of the deflection angle for uniform plasma increased with the increase in plasma parameter value,and vice versa for non uniform *** found that,under the influence of the parameter a,the values of the deflection angles for two cases ***,we investigated the magnification of image brightness using the deflection angle of the light rays around the wormhole in the EllisBronnikov theory.

关键词： lensing wormhole shadow Ellis-Bronnikov wormhole

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Probing Horava-Lifshitz gravity using particle and photon dynamics in the presence of plasma

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Chinese Physics C 2023年第7期47卷 190-203页

作者： mirzabek alloqulov Farruh Atamurotov Ahmadjon Abdujabbarov Bobomurat Ahmedov Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan Ulugh Beg Astronomical Institute Astronomy St 33Tashkent 100052Uzbekistan New Uzbekistan University Mustaqillik ave.54100007 TashkentUzbekistan Akfa University Milliy Bog’Street 264Tashkent 111221Uzbekistan Inha University in Tashkent Ziyolilar 9Tashkent 100170Uzbekistan National University of Uzbekistan Tashkent 100174Uzbekistan

We study the particle motion around a black hole(BH)in Horava-Lifshitz(HL)gravity with the Kehagias-Sfetsos(KS)***,the innermost stable circular orbit(ISCO)is obtained for massive particles around the BH in HL *** find that the radii of the ISCOs decrease as the KS parameter decreases,meaning that the parameterΩcauses the orbits of particles to move inward with respect to that of the Schwarzschild BH ***,the optical properties of a KS BH are studied in detail,that is,the BH shadow and gravitational weak *** demonstrate that the size of the BH shadow decreases under the influence of the KS parameter.

关键词： particle dynamics BH shadow weak gravitational lensing Horava Lifshitz theory

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