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Weak deflection angle and shadow cast by the charged-Kiselev black hole with cloud of strings in plasma

Chinese Physics C 2023年第2期47卷 208-230页

作者： Farruh Atamurotov Ibrar Hussain Ghulam Mustafa AliÖvgün Inha University in Tashkent Ziyolilar 9Tashkent 100170Uzbekistan Akfa University Milliy Bog'Street 264Tashkent 111221Uzbekistan National University of Uzbekistan Tashkent 100174Uzbekistan Tashkent State Technical University Tashkent 100095Uzbekistan University of Public Safety of the Republic of Uzbekistan Tashkent Region 100109Uzbekistan School of Electrical Engineering and Computer Science National University of Sciences and TechnologyH-12IslamabadPakistan Department of Physics Zhejiang Normal UniversityJinhua 321004China Physics Department Eastern Mediterranean UniversityFamagusta99628 North Cyprus via Mersin 10Turkey

In this study,the gravitational deflection angle of photons in the weak field limit(or the weak deflection angle)and shadow cast by the electrically charged and spherically symmetric static Kiselev black hole(BH)in the string cloud background are *** influences of the BH charge Q,quintessence parameterγ,and string cloud parameter a on the weak deflection angle are studied using the Gauss-Bonnet *** addition to studying the influences on the radius of photon spheres and size of the BH shadow in the spacetime geometry of the chargedKiselev BH in string ***,we study the effects of plasma(uniform and non-uniform)on the weak deflection angle and shadow cast by the charged-Kiselev BH surrounded by the clouds of *** the presence of a uniform/nonuniform plasma medium,an increase in the string cloud parameter a increases the deflection angleα.In contrast,a decrease in the BH charge Q decreases the deflection ***,we observe that an increase in the BH charge Q causes a decrease in the size of the shadow of the *** notice that,with an increase in the values of the parametersγand a,the size of the BH shadow increases,and therefore,the intensity of the gravitational field around the charged-Kiselev BH in string clouds ***,the gravitational field of the charged-Kiselev BH in the string cloud background is stronger than the field produced by the pure Reissner-Nordstrom ***,we use the data released by the Event Horizon Telescope(EHT)collaboration,for the supermassive BHs M87*and Sgr A*,to obtain constraints on the values of the parametersγand a.

关键词： charged-Kiselev Black hole cloud of strings shadow weak deflection angle Gauss-Bonnet theorem plasma medium

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Thermodynamics and overcharging problem in extended phase space of charged AdS black holes with cloud of strings and quintessence under charged particle absorption

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Chinese Physics C 2021年第2期45卷 365-376页

作者：梁靖木本荣陶军 Physics Teaching and Research section College of Medical TechnologyChengdu University of Traditional Chinese MedicineChengdu 611137China Center for Theoretical Physics College of PhysicsSichuan UniversityChengdu 610064China

The thermodynamics and overcharging problem in RN-AdS black holes with a cloud of strings and quintessence are investigated by the absorption of scalar particles and fermions in extended phase *** cosmological constant is treated as the pressure of the black *** parameters related to quintessence and the cloud of strings are treated as thermodynamic *** find that the first law of thermodynamics is satisfied and the second law of thermodynamics is ***,we find that near-extremal and extremal black holes cannot be overcharged.

关键词： overcharging problem cloud of strings quintessence

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Quasinormal modes of Bardeen black holes with a cloud of strings

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Chinese Physics C 2023年第12期47卷 151-161页

作者：刘云龙张向东 Department of Physics South China University of TechnologyGuangzhou 510641China

We investigate the quasinormal mode and greybody factor of Bardeen black holes with a cloud of strings via the WKB approximation and verify them using the Prony algorithm. We find that the imaginary part of the quasinormal mode spectra is always negative, and the perturbation does not increase with time, indicating that the system is stable under scalar field perturbation. Moreover, the string parameter a has a dramatic impact on the frequency and decay rate of the waveforms. In addition, the greybody factor increases when a and λ increase and when q and l decrease. The parameters λ and l have a significant effect on the tails. In particular, when l=0, a de Sitter phase appears at the tail.

关键词： quasinormal mode Bardeen black holes cloud of strings

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